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United States Patent Application 20180320681
Kind Code A1
Chang; Chih November 8, 2018

DIAPHRAGM PUMP

Abstract

A diaphragm pump including: a pump body including an upper cover, a valve seat and a cylinder body connected in sequence. The valve seat has a water inlet hole and a water outlet hole. The upper cover and the valve seat define a water inlet cavity and a water outlet cavity independent from each other. The water inlet hole communicates with the water inlet cavity while the water outlet hole communicates with the water outlet cavity. A mounting base is provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members are formed at a top of the water outlet cavity and extend downwards. A water inlet valve block is provided to a bottom surface of the valve seat to open or close the water inlet hole. A diaphragm assembly controls opening or closure of the water outlet hole.


Inventors: Chang; Chih; (Fujian, CN)
Applicant:
Name City State Country Type

XIAMEN KOGE MICRO TECH CO., LTD.

Fujian

CN
Family ID: 1000002966413
Appl. No.: 15/782250
Filed: October 12, 2017


Current U.S. Class: 1/1
Current CPC Class: F04B 43/043 20130101; F04B 43/0054 20130101; F04B 53/16 20130101
International Class: F04B 43/04 20060101 F04B043/04; F04B 43/00 20060101 F04B043/00; F04B 53/16 20060101 F04B053/16

Foreign Application Data

DateCodeApplication Number
May 5, 2017CN201720497206.9
Aug 30, 2017CN201721097409.5
Aug 30, 2017CN201721097501.1
Aug 30, 2017CN201721098388.9
Aug 30, 2017CN201721098389.3
Aug 30, 2017CN201721098390.6

Claims



1. A diaphragm pump, comprising: a pump body comprising an upper cover, a valve seat and a cylinder body connected in sequence, the valve seat having a water inlet hole and a water outlet hole, the upper cover and the valve seat defining a water inlet cavity and a water outlet cavity independent from each other, the water inlet hole being in communication with the water inlet cavity while the water outlet hole being in communication with the water outlet cavity, a mounting base being provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members being formed at a top of the water outlet cavity and extending downwards; a water inlet valve block provided to a bottom surface of the valve seat to open or close the water inlet hole; a diaphragm assembly mounted to the mounting base to control opening or closure of the water outlet hole, and comprising a plurality of water outlet valve blocks arranged opposite to the plurality of first position-limiting members; a piston assembly connected to a bottom of the valve seat, and comprising a capsule body having a capsule cavity, the capsule cavity being communicated with the water inlet cavity and the water outlet cavity through the water inlet hole and the water outlet hole respectively; a connecting rod assembly driving the capsule body to swing up and down between an upper movement dead point and a lower movement dead point to squeeze or stretch the capsule cavity so as to realize a function of pumping fluid, the connecting rod assembly comprising: a connecting rod connected with the capsule body, a steel shaft having an upper end connected with a connecting hole, and an eccentric wheel connected with a lower end of the steel shaft; a driving assembly comprising: a base seat connected to the pump body to define a chamber and an electric motor having an electric motor shaft connected with the eccentric wheel.

2. The diaphragm pump according to claim 1, wherein the diaphragm assembly comprises a positioning plate having an upper surface and a lower surface both configured as flat surfaces, and the positioning plate comprises: a central positioning plate; and positioning strips connected to a circumferential edge of the central positioning plate and extends along a radial direction of the central positioning plate, wherein the water outlet valve block is connected to the circumferential edge of the central positioning plate and extends along the radial direction of the central positioning plate, and a distance between an upper surface of the water outlet valve block and the upper surface of the positioning plate is identical to a distance between a lower surface of the water outlet valve block and the lower surface of the positioning plate, the water outlet valve block being located between two positioning strips.

3. The diaphragm pump according to claim 2, wherein the mounting base has a mounting groove matching the positioning plate in shape, and the mounting groove comprises: a central groove in which the central positioning plate is snapped; branch grooves distributed in a circumferential direction of the central groove and communicated with the central groove, the positioning strip being snapped in the branch groove, a second position-limiting member being provided to the top of the water outlet cavity, and a lower end of the second position-limiting member being in contact with an upper surface of the positioning strip.

4. The diaphragm pump according to claim 3, wherein a distance between an upper surface of the branch groove and the lower end of the second position-limiting member is smaller than a thickness of the positioning strip.

5. The diaphragm pump according to claim 3, wherein the central groove is provided with a first positioning column, and the central positioning plate is provided with a first positioning hole fitted with the first positioning column.

6. The diaphragm pump according to claim 3, wherein a rib is provided along a peripheral edge of the mounting groove.

7. The diaphragm pump according to claim 6, wherein an end of the branch groove away from the central groove is provided with a baffle, and an upper surface of the baffle is higher than an upper surface of the rib.

8. The diaphragm pump according to claim 6, wherein the bottom of the water outlet cavity is provided with a support stand having a through hole in communication with the water outlet hole, and the support stand is connected to the rib at a circumferential edge of the central groove.

9. The diaphragm pump according to claim 8, wherein a diaphragm part is provided between the water outlet valve block and the central positioning plate, and an arc groove is formed at a position where a peripheral edge of the diaphragm part is connected with the positioning strip.

10. The diaphragm pump according to claim 9, wherein a connecting bridge is provided between the support stand and the rib, and the connecting bridge is disposed opposite to the diaphragm part.

11. The diaphragm pump according to claim 2, wherein the positioning strips are equally spaced and distributed along the circumferential edge of the central groove, and the water outlet valve block and two adjacent positioning strips are spaced from each other.

12. The diaphragm pump according to claim 1, wherein the upper cover constructs a downwardly open cavity structure, and an upper annular partition plate is provided to a bottom surface of the upper cover; the valve seat constructs an upwardly open cavity structure, and a lower annular partition plate corresponding to the upper annular partition plate is provided to a top surface of the valve seat.

13. The diaphragm pump according to claim 1, wherein a bottom surface of the cylinder body extends downwards to form a stopping member, and a lower end face of the stopping member is opposite to and spaced at a predetermined distance from a central position in a top surface of the connecting rod.

14. The diaphragm pump according to claim 1, wherein the capsule body comprises: a plurality of capsule cavities open upwards; a panel located between the valve seat and the cylinder body and connected to respective upper outer circumferential edges of the plurality of capsule cavities, so as to connect the plurality of capsule cavities into a whole; a mounting column connected to a bottom of the capsule cavity, the connecting rod being provided with a second mounting hole fitted with the mounting column.

15. The diaphragm pump according to claim 14, wherein the capsule cavity comprises: a thin-walled part having a bottom surface connected with an upper end of the mounting column; and a thick-walled part having a lower end whose circumferential edge is connected with a circumferential edge of an upper end of the thin-walled part, and an upper end whose circumferential edge is connected with a bottom surface of the panel.

16. The diaphragm pump according to claim 15, wherein a wall thickness of the thick-walled part is larger than that of the thin-walled part.

17. The diaphragm pump according to claim 14, wherein a second positioning column is provided to a top surface of the cylinder body and extends upwards, and the panel is provided with a second positioning hole fitted with the second positioning column.

18. The diaphragm pump according to claim 17, wherein the second positioning column is in interference fit with the second positioning hole.

19. The diaphragm pump according to claim 1, wherein the cylinder body is provided with a first mounting hole, and the capsule body is snapped into the first mounting hole and immobilized relative to the first mounting hole.

20. The diaphragm pump according to claim 1, wherein a columnar boss is provided to the bottom surface of the valve seat and extends downwards, the columnar boss has the water inlet hole penetrating through the bottom and top surfaces of the valve seat, and a circumferential wall of the columnar boss extends obliquely from up to down to form a first inclined surface.

21. The diaphragm pump according to claim 20, wherein an upper inner circumferential edge of the capsule cavity extends obliquely from up to down to form a second inclined surface, the first inclined surface being closely fitted with the second inclined surface.

22. The diaphragm pump according to claim 20, wherein the columnar boss has a third positioning hole configured to immobilize the water inlet valve block, and a plurality of water inlet holes are defined in a circumferential direction of the third positioning hole.

23. The diaphragm pump according to claim 22, wherein the water inlet valve block comprises: a valve membrane covering the water inlet hole; and a third positioning column having a first end connected to the valve membrane and a second end upwardly extending through the third positioning hole.

24. The diaphragm pump according to claim 23, wherein the first end of the third positioning column forms an anti-rotation flange, and the third positioning hole has a position-limiting groove fitted with the anti-rotation flange.

25. The diaphragm pump according to claim 23, wherein the second end of the third positioning column has a position-limiting protrusion, and the position-limiting protrusion abuts against the top surface of the valve seat.

26. The diaphragm pump according to claim 20, wherein the columnar boss has an avoidance notch, and an inlet end of the water outlet hole is arranged opposite to the avoidance notch.

27. The diaphragm pump according to claim 20, wherein three columnar bosses are provided to the bottom surface of the valve seat, and the three columnar bosses constitute an equilateral triangle.

28. The diaphragm pump according to claim 1, wherein the connecting rod comprises: a rod body having a first end of the rod body provided with the connecting hole extending along an axial direction of the rod body, a circumferential face of the connecting hole being provided with a plurality of heat radiating grooves, and the plurality of heat radiating grooves extending along an axial direction of the connecting hole; and a mounting plate connected to a second end of the rod body, a plurality of connecting arms being spaced along a circumferential direction of the mounting plate, the mounting plate having a plurality of material-reducing holes formed by recessing a top surface of the mounting plate downwardly, the plurality of connecting arms obliquely extending downwards and outwards from a central position in the mounting plate, a free end of each connecting arm being provided with a mounting protrusion, and a lower end face of the mounting protrusion being lower than a lower end face of the connecting arm.

29. The diaphragm pump according to claim 28, wherein a reinforcing rib is provided between an outer circumferential surface of the mounting protrusion and an outer circumferential surface of the rod body, and the reinforcing rib extends upwards to be connected to a bottom surface of the mounting plate.

30. The diaphragm pump according to claim 1, further comprising: a photoelectric shielding sheet integrally formed with the eccentric wheel and rotating synchronously with the eccentric wheel and the electric motor shaft; and a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detection signal to an electric motor controller, the electric motor controller being configured to adjust the rotational speed of the electric motor shaft of the electric motor according to the detection signal.

31. The diaphragm pump according to claim 30, wherein the photoelectric shielding sheet extends outwards along a radial direction of the eccentric wheel.

32. The diaphragm pump according to claim 30, wherein the photoelectric shielding sheet comprises: a positioning portion provided to an upper surface of the eccentric wheel; and a shielding portion connected to the positioning portion and extending radially outwards.
Description



CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to and benefits of Chinese Patent Application Serial No. 201720497206.9, filed with the State Intellectual Property Office of P. R. China on May 5, 2017, Chinese Patent Application Serial No. 201721098389.3, filed with the State Intellectual Property Office of P. R. China on Aug. 30, 2017, Chinese Patent Application Serial No. 201721098388.9, filed with the State Intellectual Property Office of P. R. China on Aug. 30, 2017, Chinese Patent Application Serial No. 201721098390.6, filed with the State Intellectual Property Office of P. R. China on Aug. 30, 2017, Chinese Patent Application Serial No. 201721097501.1, filed with the State Intellectual Property Office of P. R. China on Aug. 30, 2017, and Chinese Patent Application Serial No. 201721097409.5, filed with the State Intellectual Property Office of P. R. China on Aug. 30, 2017, the entire content of which are incorporated herein by reference.

FIELD

[0002] The present disclosure relates to a technical field of pumps, and more particularly to a diaphragm pump.

BACKGROUND

[0003] A micro water pump in the related art has unstable water flow and low efficiency.

SUMMARY

[0004] Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art to at least some extent.

[0005] Accordingly, the present disclosure provides a diaphragm pump that has stable flow.

[0006] The diaphragm pump according to embodiments of the present disclosure includes: a pump body including an upper cover, a valve seat and a cylinder body connected in sequence, the valve seat having a water inlet hole and a water outlet hole, the upper cover and the valve seat defining a water inlet cavity and a water outlet cavity independent from each other, the water inlet hole being in communication with the water inlet cavity while the water outlet hole being in communication with the water outlet cavity, a mounting base being provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members being formed at a top of the water outlet cavity and extending downwards; a water inlet valve block provided to a bottom surface of the valve seat to open or close the water inlet hole; a diaphragm assembly mounted to the mounting base to control opening or closure of the water outlet hole, and including a plurality of water outlet valve blocks arranged opposite to the plurality of first position-limiting members; a piston assembly connected to a bottom of the valve seat, and including a capsule body having a capsule cavity, the capsule cavity being communicated with the water inlet cavity and the water outlet cavity through the water inlet hole and the water outlet hole respectively; a connecting rod assembly driving the capsule body to swing up and down between an upper movement dead point and a lower movement dead point to squeeze or stretch the capsule cavity so as to realize a function of pumping fluid, the connecting rod assembly including: a connecting rod connected with the capsule body, a steel shaft having an upper end connected with a connecting hole, and an eccentric wheel connected with a lower end of the steel shaft; a driving assembly including: a base seat connected to the pump body to define a chamber and an electric motor having an electric motor shaft connected with the eccentric wheel.

[0007] In the diaphragm pump according to embodiments of the present disclosure, since the plurality of spaced first position-limiting members are formed at the top of the water outlet cavity and extend downwards, a degree of openness of the water outlet valve block can be limited by the first position-limiting members, and an output flow of the diaphragm pump keeps stable.

[0008] In addition, the diaphragm pump according to embodiments of the present disclosure can further include the following additional technical features.

[0009] According to some embodiments of the present disclosure, the diaphragm assembly includes a positioning plate having an upper surface and a lower surface both configured as flat surfaces. The positioning plate includes: a central positioning plate; and positioning strips connected to a circumferential edge of the central positioning plate and extends along a radial direction of the central positioning plate. The water outlet valve block is connected to the circumferential edge of the central positioning plate and extends along the radial direction of the central positioning plate, and a distance between an upper surface of the water outlet valve block and the upper surface of the positioning plate is identical to a distance between a lower surface of the water outlet valve block and the lower surface of the positioning plate, the water outlet valve block being located between two positioning strips.

[0010] According to some embodiments of the present disclosure, the mounting base has a mounting groove matching the positioning plate in shape. Moreover, the mounting groove includes: a central groove in which the central positioning plate is snapped; branch grooves distributed in a circumferential direction of the central groove and communicated with the central groove, the positioning strip being snapped in the branch groove, a second position-limiting member being provided to the top of the water outlet cavity, and a lower end of the second position-limiting member being in contact with an upper surface of the positioning strip.

[0011] According to some embodiments of the present disclosure, a distance between an upper surface of the branch groove and the lower end of the second position-limiting member is smaller than a thickness of the positioning strip.

[0012] According to some embodiments of the present disclosure, the central groove is provided with a first positioning column, and the central positioning plate is provided with a first positioning hole fitted with the first positioning column.

[0013] According to some embodiments of the present disclosure, a rib is provided along a peripheral edge of the mounting groove.

[0014] According to some embodiments of the present disclosure, an end of the branch groove away from the central groove is provided with a baffle, and an upper surface of the baffle is higher than an upper surface of the rib.

[0015] According to some embodiments of the present disclosure, the bottom of the water outlet cavity is provided with a support stand having a through hole in communication with the water outlet hole, and the support stand is connected to the rib at a circumferential edge of the central groove.

[0016] According to some embodiments of the present disclosure, a diaphragm part is provided between the water outlet valve block and the central positioning plate, and an arc groove is formed at a position where a peripheral edge of the diaphragm part is connected with the positioning strip.

[0017] According to some embodiments of the present disclosure, a connecting bridge is provided between the support stand and the rib, and the connecting bridge is disposed opposite to the diaphragm part.

[0018] According to some embodiments of the present disclosure, the positioning strips are equally spaced and distributed along the circumferential edge of the central groove, and the water outlet valve block and two adjacent positioning strips are spaced from each other.

[0019] According to some embodiments of the present disclosure, the upper cover constructs a downwardly open cavity structure, and an upper annular partition plate is provided to a bottom surface of the upper cover; the valve seat constructs an upwardly open cavity structure, and a lower annular partition plate corresponding to the upper annular partition plate is provided to a top surface of the valve seat.

[0020] According to some embodiments of the present disclosure, a bottom surface of the cylinder body extends downwards to form a stopping member, and a lower end face of the stopping member is opposite to and spaced at a predetermined distance from a central position in a top surface of the connecting rod.

[0021] According to some embodiments of the present disclosure, the capsule body includes: a plurality of capsule cavities opened upwards; a panel located between the valve seat and the cylinder body and connected to respective upper outer circumferential edges of the plurality of capsule cavities, so as to connect the plurality of capsule cavities into a whole; a mounting column connected to a bottom of the capsule cavity, the connecting rod being provided with a second mounting hole fitted with the mounting column.

[0022] According to some embodiments of the present disclosure, the capsule cavity includes: a thin-walled part having a bottom surface connected with an upper end of the mounting column; and a thick-walled part having a lower end whose circumferential edge is connected with a circumferential edge of an upper end of the thin-walled part, and an upper end whose circumferential edge is connected with a bottom surface of the panel.

[0023] According to some embodiments of the present disclosure, a wall thickness of the thick-walled part is larger than that of the thin-walled part.

[0024] According to some embodiments of the present disclosure, a second positioning column is provided to a top surface of the cylinder body and extends upwards, and the panel is provided with a second positioning hole fitted with the second positioning column.

[0025] According to some embodiments of the present disclosure, the second positioning column is in interference fit with the second positioning hole.

[0026] According to some embodiments of the present disclosure, the cylinder body is provided with a first mounting hole, and the capsule body is snapped into the first mounting hole and immobilized relative to the first mounting hole.

[0027] According to some embodiments of the present disclosure, a columnar boss is provided to the bottom surface of the valve seat and extends downwards, the columnar boss has the water inlet hole penetrating through the bottom and top surfaces of the valve seat, and a circumferential wall of the columnar boss extends obliquely from up to down to form a first inclined surface.

[0028] According to some embodiments of the present disclosure, an upper inner circumferential edge of the capsule cavity extends obliquely from up to down to form a second inclined surface, the first inclined surface being closely fitted with the second inclined surface.

[0029] According to some embodiments of the present disclosure, the columnar boss has a third positioning hole configured to immobilize the water inlet valve block, and a plurality of water inlet holes are defined in a circumferential direction of the third positioning hole.

[0030] According to some embodiments of the present disclosure, the water inlet valve block includes: a valve membrane covering the water inlet hole; and a third positioning column having a first end connected to the valve membrane and a second end upwardly extending through the third positioning hole.

[0031] According to some embodiments of the present disclosure, the first end of the third positioning column forms an anti-rotation flange, and the third positioning hole has a position-limiting groove fitted with the anti-rotation flange.

[0032] According to some embodiments of the present disclosure, the second end of the third positioning column has a position-limiting protrusion, and the position-limiting protrusion abuts against the top surface of the valve seat.

[0033] According to some embodiments of the present disclosure, the columnar boss has an avoidance notch, and an inlet end of the water outlet hole is arranged opposite to the avoidance notch.

[0034] According to some embodiments of the present disclosure, three columnar bosses are provided to the bottom surface of the valve seat, and the three columnar bosses constitute an equilateral triangle.

[0035] According to some embodiments of the present disclosure, the connecting rod includes: a rod body having a first end of the rod body provided with the connecting hole extending along an axial direction of the rod body, a circumferential face of the connecting hole being provided with a plurality of heat radiating grooves, and the plurality of heat radiating grooves extending along an axial direction of the connecting hole; and a mounting plate connected to a second end of the rod body, a plurality of connecting arms being spaced along a circumferential direction of the mounting plate, the mounting plate having a plurality of material-reducing holes formed by recessing a top surface of the mounting plate downwardly, the plurality of connecting arms obliquely extending downwards and outwards from a central position in the mounting plate, a free end of each connecting arm being provided with a mounting protrusion, and a lower end face of the mounting protrusion being lower than a lower end face of the connecting arm.

[0036] According to some embodiments of the present disclosure, a reinforcing rib is provided between an outer circumferential surface of the mounting protrusion and an outer circumferential surface of the rod body, and the reinforcing rib extends upwards to be connected to a bottom surface of the mounting plate.

[0037] According to some embodiments of the present disclosure, the diaphragm pump further includes: a photoelectric shielding sheet integrally formed with the eccentric wheel and rotating synchronously with the eccentric wheel and the electric motor shaft; and a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detection signal to an electric motor controller, the electric motor controller being configured to adjust the rotational speed of the electric motor shaft of the electric motor according to the detection signal.

[0038] According to some embodiments of the present disclosure, the photoelectric shielding sheet extends outwards along a radial direction of the eccentric wheel.

[0039] According to some embodiments of the present disclosure, the photoelectric shielding sheet includes: a positioning portion provided to an upper surface of the eccentric wheel; and a shielding portion connected to the positioning portion and extending radially outwards.

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:

[0041] FIG. 1 is a partially sectional view of a diaphragm pump according to an embodiment of the present disclosure;

[0042] FIG. 2 is an exploded view of a diaphragm pump according to an embodiment of the present disclosure;

[0043] FIG. 3 is a partially sectional view of a diaphragm pump according to an embodiment of the present disclosure;

[0044] FIG. 4 is a perspective view of an upper cover according to an embodiment of the present disclosure;

[0045] FIG. 5 is a bottom view of an upper cover according to an embodiment of the present disclosure;

[0046] FIG. 6 is a perspective view of a valve seat according to an embodiment of the present disclosure;

[0047] FIG. 7 is a perspective view of a diaphragm assembly according to an embodiment of the present disclosure;

[0048] FIG. 8 is a perspective view of a diaphragm assembly mounted to a valve seat according to an embodiment of the present disclosure;

[0049] FIG. 9 is a top view of a diaphragm assembly mounted to a valve seat according to an embodiment of the present disclosure;

[0050] FIG. 10 is a perspective view of a cylinder body according to an embodiment of the present disclosure;

[0051] FIG. 11 is a perspective view of a cylinder body according to an embodiment of the present disclosure;

[0052] FIG. 12 is a perspective view of a capsule body according to an embodiment of the present disclosure;

[0053] FIG. 13 is a perspective view of a capsule body according to an embodiment of the present disclosure;

[0054] FIG. 14 is a perspective view of a valve seat according to an embodiment of the present disclosure;

[0055] FIG. 15 is a sectional view taken along line A-A of FIG. 14 according to an embodiment of the present disclosure;

[0056] FIG. 16 is a perspective view of a valve seat according to an embodiment of the present disclosure;

[0057] FIG. 17 is a perspective view of a water inlet valve block according to an embodiment of the present disclosure;

[0058] FIG. 18 is a perspective view of a connecting rod according to an embodiment of the present disclosure;

[0059] FIG. 19 is a bottom view of a connecting rod according to an embodiment of the present disclosure;

[0060] FIG. 20 is a sectional view taken along line B-B of FIG. 19 according to an embodiment of the present disclosure;

[0061] FIG. 21 is a perspective view of a connecting rod assembly according to an embodiment of the present disclosure;

[0062] FIG. 22 is a bottom view of a connecting rod assembly according to an embodiment of the present disclosure;

[0063] FIG. 23 is a sectional view taken along line C-C of FIG. 22 according to an embodiment of the present disclosure;

[0064] FIG. 24 is an assembly view of a photoelectric sensor, a printed circuit board and a lead wire connector according to an embodiment of the present disclosure;

[0065] FIG. 25 is a perspective view of a lead wire according to an embodiment of the present disclosure.

REFERENCE NUMERALS

[0066] diaphragm pump 100,

[0067] driving assembly 10, base seat 11, electric motor 12, electric motor shaft 121,

[0068] pump body 20, [0069] cavity 21, water outlet cavity 211, water inlet cavity 212, [0070] upper cover 22, first position-limiting member 221, second position-limiting member 222, upper annular partition plate 223, water inlet pipe 224, water outlet pipe 225, [0071] valve seat 23, mounting base 230, first positioning column 2303, rib 2304, support stand 231, lower annular partition plate 232, mounting groove 233, central groove 2331, branch groove 2332, baffle 2333, connecting bridge 234, water outlet hole 235, water inlet hole 236, columnar boss 237, first inclined surface 2370, third positioning hole 2371, position-limiting groove 2372, avoidance notch 2373, [0072] cylinder body 24, stopping member 241, second positioning column 242, first mounting hole 243, [0073] diaphragm assembly 25, water outlet valve block 251, positioning plate 252, central positioning plate 2521, positioning strip 2522, first positioning hole 253, diaphragm part 254, [0074] water inlet valve block 26, valve membrane 261, third positioning column 262, anti-rotation flange 263, position-limiting protrusion 264, [0075] chamber 27, [0076] connecting rod assembly 30; connecting rod 31, second mounting hole 311, rod body 312, connecting hole 3121, heat radiating groove 3122, mounting plate 313, material-reducing hole 3131, connecting arm 314, mounting protrusion 3141, reinforcing rib 315, [0077] steel shaft 32, [0078] eccentric wheel 33, eccentric hole 331,

[0079] photoelectric shielding sheet 40, inclined hole 41,

[0080] photoelectric sensor 50,

[0081] printed circuit board 70, lead wire connector 71, lead wire jack 711,

[0082] lead wire 80, lead wire plug 81,

[0083] piston assembly 90, capsule body 91, panel 911, second positioning hole 9110, capsule cavity 912, second inclined surface 9120, thick-walled part 913, thin-walled part 914, mounting column 915.

DETAILED DESCRIPTION

[0084] Reference will be made in detail to embodiments of the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure rather than construed to limit the present disclosure.

[0085] A diaphragm pump 100 according to embodiments of the present disclosure will be described in below with reference to FIGS. 1-25. The diaphragm pump 100 can be widely used in technical fields of medical equipment and home appliances. For example, the diaphragm pump 100 may be applied in a coffee machine or a juicer, and water is pumped to the coffee machine or the juicer through the diaphragm pump 100. For another example, the diaphragm pump 100 may also be applied in a sphygmomanometer, a car seat or a massage chair, and the sphygmomanometer, the car seat or the massage chair may be inflated or deflated through the diaphragm pump 100. It could be understood that, the above description is just illustrative, and is not a limit to the protection scope of the present disclosure.

[0086] The diaphragm pump 100 according to embodiments of the present disclosure, as shown in FIGS. 1, 2 and 3, can generally include a pump body 20, a water inlet valve block 26, a diaphragm assembly 25, a piston assembly 90, a connecting rod assembly 30 and a driving assembly 10. The driving assembly 10 can include a base seat 11 and an electric motor 12 provided to the base seat 11.

[0087] The pump body 20 includes an upper cover 22, a valve seat 23 and a cylinder body 24 which are connected in sequence. The valve seat 23 is provided with a water inlet hole 236 and a water outlet hole 235. The upper cover 22 and the valve seat 23 define a water inlet cavity 212 and a water outlet cavity 211 independent from each other, the water inlet hole 236 is in communication with the water inlet cavity 212, and the water outlet hole 235 is in communication with the water outlet cavity 211. A bottom of the water outlet cavity 211 is provided with a mounting base 230. As shown in FIG. 4, a plurality of first position-limiting members 221 spaced from each other are formed at a top of the water outlet cavity 211 and extend downwards.

[0088] The water inlet valve block 26 is provided to a bottom surface of the valve seat 23 to open or close the water inlet hole 236. The diaphragm assembly 25 is mounted to the mounting base 230 to control opening or closure of the water outlet hole 235. The diaphragm assembly 25 includes a plurality of water outlet valve blocks 251 arranged opposite to the plurality of first position-limiting members 221.

[0089] The piston assembly 90 is connected to a bottom of the valve seat 23, and includes a capsule body 91 having a capsule cavity 912. The capsule cavity 912 is communicated with the water inlet cavity 212 and the water outlet cavity 211 through the water inlet hole 236 and the water outlet hole 235 respectively.

[0090] The connecting rod assembly 30 drives the capsule body 91 to swing up and down between an upper movement dead point and a lower movement dead point to squeeze or stretch the capsule cavity 912 to realize a function of pumping fluid. The connecting rod assembly 30 includes a connecting rod 31, a steel shaft 32 and an eccentric wheel 33. The connecting rod 31 is connected with the capsule body 91, and the steel shaft 32 has an upper end connected with a connecting hole 3121 and a lower end connected with the eccentric wheel 33. The driving assembly 10 includes the base seat 11 and the electric motor 12, the pump body 20 is connected to the base seat 11 to define a chamber 27, and the electric motor 12 has an electric motor shaft 121 that is connected with the eccentric wheel 33.

[0091] Specifically, as shown in FIGS. 1, 2 and 3, the pump body 20 can include the upper cover 22, the valve seat 23 and the cylinder body 24 which are connected in sequence. The upper cover 22 includes a water inlet pipe 224 having a water inlet and a water outlet pipe 225 having a water outlet. The valve seat 23 is provided with a plurality of groups of water outlet holes 235 and a plurality of groups of water inlet holes 236. The water inlet valve block 26 for opening or closing the water inlet hole 236 is provided at a position on a lower surface of the valve seat 23 corresponding to each group of water inlet holes 236, and for example is an umbrella-shaped valve. The diaphragm assembly 25 for opening or closing the water outlet hole 235 is provided at a position on an upper surface of the valve seat 23 corresponding to the water outlet hole 235.

[0092] As shown in FIGS. 10, 11, 12 and 13, the cylinder body 24 is connected between the valve seat 23 and the base seat 11, and the cylinder body 24 is provided with a plurality of first mounting holes 243. The piston assembly 90 for pumping the fluid is mounted to the cylinder body 24. The piston assembly 90 has a plurality of capsule bodies 91 and a panel 911 for connecting the plurality of capsule bodies 91. Each capsule body 91 falls into the first mounting hole 243. Each capsule body 91 includes the capsule cavity 912 and a mounting column 915. An upper end of the capsule cavity 912 is open, and the panel 911 and a circumferential edge of the upper end of each capsule cavity 912 are connected and formed integrally. A lower end of the capsule cavity 912 is connected with an upper end of the mounting column 915. Each capsule cavity 912 runs through the first mounting hole 243 and is closely provided to an upper surface of the cylinder body 24 by the panel 911. The valve seat 23 is pressed on the panel 911 so that the piston assembly 90 is clamped between the valve seat 23 and the base seat 11.

[0093] The upper cover 22 and the valve seat 23 may be snap-fitted together, the valve seat 23 and the cylinder body 24 being snap-fitted together as well as the cylinder body 24 and the base seat 11 being snap-fitted together, and then all of them may be connected into a whole by a plurality of clamps. The pump body 20 may be configured as a square frame or a cylindrical frame.

[0094] As shown in FIGS. 1, 3 and 13, the connecting rod assembly 30 is connected with the electric motor shaft 121 of the electric motor 12 and the mounting column 915 separately, such that during rotation of the electric motor 12, the connecting rod assembly 30 drives the capsule body 91 to swing up and down, thereby compressing and expanding the capsule cavity 912 to perform a process of pumping the fluid. In the diaphragm pump 100, during the opening or closure of the water outlet valve block 251, the first position-limiting member 221 limits a degree of openness of the water outlet valve block 251, that is, upon an upper surface of the water outlet valve block 251 touches a lower end face of the first position-limiting member 221, the first position-limiting member 221 will prevent the water outlet valve block 251 from continuing moving upwards, such that the degree of openness of the water outlet valve block 251 remains constant, and hence an output flow of the diaphragm pump 100 remains constant. Furthermore, the first position-limiting member 221 solves a problem that the water outlet valve block 251 opens upwards excessively and cannot be restored.

[0095] Therefore, in the diaphragm pump 100 according to embodiments of the present disclosure, since the plurality of spaced first position-limiting members 221 are formed at the top of the water outlet cavity 211 and extend downwards, the degree of openness of the water outlet valve block 251 can be limited by the first position-limiting members 221, and the output flow of the diaphragm pump 100 keeps stable.

[0096] In some embodiments of the present disclosure, referring to FIGS. 6 and 7, the diaphragm assembly 25 includes a positioning plate 252. The positioning plate 252 includes a central positioning plate 2521 and a positioning strip 2522, and the positioning strip 2522 is connected to a circumferential edge of the central positioning plate 2521 and extends along a radial direction of the central positioning plate 2521. The water outlet valve block 251 is connected to the circumferential edge of the central positioning plate 2521 and extends along the radial direction of the central positioning plate 2521, and the water outlet valve block 251 is located between two positioning strips 2522. The plurality of water outlet valve blocks 251 are integrated and provided to the positioning plate 252, so as to facilitate processing and molding of the diaphragm assembly 25 and reduce production costs.

[0097] In an optional embodiment, upper and lower surfaces of the diaphragm assembly 25 can be configured as flat surfaces, such that it is unnecessary to distinguish which direction the diaphragm assembly 25 is mounted to the mounting base 230, thereby improving mounting efficiency.

[0098] In some embodiments of the present disclosure, as shown in FIG. 6, the mounting base 230 has a mounting groove 233, and the mounting groove 233 includes a central groove 2331 and branch grooves 2332. The central positioning plate 2521 is snapped in the central groove 2331, the branch grooves 2332 are distributed in a circumferential direction of the central groove 2331 and communicated with the central groove 2331, and the positioning strip 2522 is snapped in the branch groove 2332. The top of the water outlet cavity 211 is provided with a second position-limiting member 222, and a lower end of the second position-limiting member 222 is in contact with an upper surface of the positioning strip 2522.

[0099] As shown in FIG. 4, the second position-limiting member 222 is provided at the top of the water outlet cavity 211, and the lower end of the second position-limiting member 222 is in contact with the upper surface of the positioning strip 2522. That is, the positioning strip 2522 of the diaphragm assembly 25 is defined in the branch groove 2332, displacement of the positioning strip 2522 in the circumferential direction is restricted by the branch groove 2332, and displacement of the positioning strip 2522 in an up-and-down direction is restricted by the second position-limiting member 222. Thus, the diaphragm assembly 25 can be mounted and positioned on the mounting base 230 effectively, and displacement of the diaphragm assembly 25 can be avoided to enable the diaphragm pump 100 to pump the fluid normally.

[0100] In some optional embodiments, a distance between an upper surface of the branch groove 2332 and the lower end of the second position-limiting member 222 is smaller than a thickness of the positioning strip 2522. That is, when the diaphragm assembly 25 is assembled to the mounting base 230, the second position-limiting member 222 can be pressed against and limit the upper surface of the positioning strip 2522, i.e. when the second position-limiting member 222 acts on the upper surface of the positioning strip 2522, the positioning strip 2522 is compressed slightly, and hence the displacement of the positioning strip 2522 in the up-and-down direction is defined effectively.

[0101] Certainly, it could be understood that the lower end of the second position-limiting member 222 may not apply a pre-pressure to the upper surface of the positioning strip 2522, i.e. the lower end of the second position-limiting member 222 is fitted with the upper surface of the positioning strip 2522 with zero compression.

[0102] In some embodiments, as shown in FIG. 6, the central groove 2331 is provided with a first positioning column 2303, and the central positioning plate 2521 is provided with a first positioning hole 253 fitted with the first positioning column 2303. The fitting between the first positioning column 2303 and the first positioning hole 253 serves as an initial positioning and provides a basis for the subsequent installation of the diaphragm assembly 25.

[0103] In some specific embodiments, as shown in FIGS. 6 and 8, a rib 2304 is provided along a peripheral edge of the mounting groove 233. The rib 2304 extends upwards to define an accommodating space for the diaphragm assembly 25, thereby effectively limiting a degree of freedom of the diaphragm assembly 25 in the circumferential direction.

[0104] In a specific embodiment, as shown in FIGS. 6 and 8, an end of the branch groove 2332 away from the central groove 2331 is provided with a baffle 2333, and an upper surface of the baffle 2333 is higher than an upper surface of the rib 2304. The central positioning plate 2521 is snapped in the central groove 2331, and the positioning strip 2522 is snapped in the branch groove 2332.

[0105] During the installation of the diaphragm assembly 25, the central positioning plate 2521 can be first pressed in the central groove 2331, and then the positioning strip 2522 is pressed into the branch groove 2332. Since the end of the branch groove 2332 is provided with the baffle 2333 higher than the rib 2304, it is possible to prevent the positioning strip 2522 from moving along a circumferential direction of the central positioning plate 2521 and enhance stability of the installation of the diaphragm assembly 25, such that the water outlet valve block 251 and the water outlet hole 235 are accurately fitted to effectively control the opening and closure of the water outlet hole 235.

[0106] In some other optional embodiments, as shown in FIG. 6, the bottom of the water outlet cavity 211 is provided with a support stand 231 having a through hole in communication with the water outlet hole 235, and the support stand 231 is connected to the rib 2304 at a circumferential edge of the central groove 2331. Thus, after the diaphragm assembly 25 is assembled to the mounting base 230, the water outlet valve block 251 is supported on an upper surface of the support stand 231 to enable the water outlet valve block 251 to close an upper opening of the water outlet hole 235.

[0107] In a specific embodiment of the present disclosure, as shown in FIGS. 7, 8 and 9, the positioning strips 2522 are equally spaced and distributed along the circumferential edge of the central groove 2331, and the water outlet valve block 251 and two adjacent positioning strips 2522 are spaced from each other. Specifically, the diaphragm assembly 25 is positioned on the valve seat 23, in which the water outlet valve block 251 is arranged corresponding to the support stand 231 of the water outlet hole 235. When the diaphragm pump 100 operates to drain water, water flows through the water outlet hole 235, under the water pressure, the water outlet valve block 251 covering the water outlet hole 235 is opened, and the water flows into the water outlet cavity 211. It could be understood that a thickness of the water outlet valve block 251 is smaller than the thickness of the positioning strip 2522, and a raised height of the support stand 231 makes the upper surface of the support stand 231 just in contact with a lower surface of the water outlet valve block 251, which ensures sealing performance.

[0108] In an optional embodiment, referring to FIGS. 7, 8 and 9, a diaphragm part 254 is provided between the water outlet valve block 251 and the central positioning plate 2521, and an arc groove is formed at a position where a peripheral edge of the diaphragm part 254 is connected with the positioning strip 2522. It could be understood that the diaphragm part 254 is thinner than the water outlet valve block 251, and in a certain range, the thinner diaphragm part 254 has better elasticity and fatigue durability, thereby prolonging its service life, and is more sensitive to pressure, thereby enabling the diaphragm pump 100 to control the flow precisely.

[0109] In some embodiments of the present disclosure, as shown in FIG. 3 in combination with FIGS. 4 and 5, the upper cover 22 constructs a downwardly open cavity structure, and an upper annular partition plate 223 is provided to a bottom surface of the upper cover 22; the valve seat 23 constructs an upwardly open cavity structure, and a lower annular partition plate 232 corresponding to the upper annular partition plate 223 is provided to a top surface of the valve seat 23.

[0110] Specifically, a bottom of the upper cover 22 is recessed upwards to form a first groove, and the first groove is divided into an upper outer groove and an upper inner groove by the upper annular partition plate 223. An upper surface of the valve seat 23 is recessed downwards to form a second groove corresponding to the first groove, and the second groove is divided into a lower outer groove and a lower inner groove by the lower annular partition plate 232 corresponding to the upper annular partition plate 223. The upper cover 22 is mounted to the valve seat 23 in a sealing manner, and the water inlet cavity 212 located outside and the water outlet cavity 211 located inside are partitioned by the upper annular partition plate 223 and the lower annular partition plate 232, in which the water inlet cavity 212 is communicated with the water inlet, and the water outlet cavity 211 is communicated with the water outlet. That is, the upper annular partition plate 223 of the upper cover 22 and the lower annular partition plate 232 of the valve seat 23 are snap-fitted, such that a cavity 21 between the upper cover 22 and the valve seat 23 is divided into two.

[0111] In some embodiments of the present disclosure, as shown in FIGS. 1, 2 and 3, the bottom of the water outlet cavity 211 is provided with the mounting base 230. The diaphragm assembly 25 is mounted to the mounting base 230, so as to control the opening and closure of the water outlet hole 235. In other words, the water outlet cavity 211 is in communication with the water outlet hole 235, and when the capsule cavity 912 is compressed, the water inlet valve block 26 closes the water inlet hole 236 while the diaphragm assembly 25 opens the water outlet hole 235, such that the fluid in the capsule cavity 912 enters the water outlet cavity 211 through the water outlet hole 235; when the capsule cavity 912 is stretched and expanded, the water inlet valve block 26 opens the water inlet hole 236 while the diaphragm assembly 25 closes the water outlet hole 235, such that the fluid in the water inlet cavity 212 enters the capsule cavity 912.

[0112] As shown in FIG. 7, the diaphragm assembly 25 includes the positioning plate 252 and the plurality of water outlet valve blocks 251. Upper and lower surfaces of the positioning plate 252 are configured as flat surfaces. The water outlet valve block 251 is connected to a peripheral edge of the positioning plate 252 and extends towards a radial direction of the positioning plate 252. A distance between the upper surface of the water outlet valve block 251 and the upper surface of the positioning plate 252 is identical to a distance between the lower surface of the water outlet valve block 251 and the lower surface of the positioning plate 252.

[0113] In other words, the upper surface and the lower surface of the diaphragm assembly 25 are symmetrically disposed relative to a central plane in an up-and-down direction of the diaphragm assembly 25, such that an operator does not need to distinguish front and back sides when the diaphragm assembly 25 is mounted, thereby improving the mounting efficiency and reducing the production cost of the diaphragm pump 100.

[0114] In some optional embodiments, as shown in FIGS. 6, 7, 8 and 9, the mounting base 230 is provided with the mounting groove 233 fitted with the positioning plate 252. For example, the upper surface of the valve seat 23 is recessed downwards to form the mounting groove 233 configured to mount and match with the positioning plate 252, or the upper surface of the valve seat 23 extends upwards to form the mounting groove 233 configured to mount and match with the positioning plate 252. Thus, the positioning plate 252 is reliably positioned on the valve seat 23.

[0115] In an optional embodiment of the present disclosure, referring to FIG. 6, a connecting bridge 234 is provided between the support stand 231 and the rib 2304, and the connecting bridge 234 is disposed opposite to the diaphragm part 254. An upper surface of the connecting bridge 234 is flush with the upper surface of the support stand, such that when the water outlet valve block 251 is opened upwards, the diaphragm part 254 moves downwards correspondingly, and since the presence of the connecting bridge 234 serving as a support, the diaphragm part 254 is prevented from swinging downwards excessively.

[0116] In some embodiments of the present disclosure, referring to FIGS. 1 and 3, the piston assembly 90 is connected to the bottom of the valve seat 23 and includes the capsule body 91 having the capsule cavity 912. The capsule cavity 912 is communicated with the water inlet cavity 212 and the water outlet cavity 211 through the water inlet hole 236 and the water outlet hole 235 respectively. A bottom surface of the cylinder body 24 extends downwards to form a stopping member 241.

[0117] The connecting rod assembly 30 drives the capsule body 91 to swing up and down between the upper movement dead point and the lower movement dead point to squeeze or stretch the capsule cavity 912 to realize the function of pumping the fluid. The connecting rod assembly 30 includes the connecting rod 31, and the connecting rod 31 is connected with the capsule body 91. A lower end face of the stopping member 241 is opposite to and spaced at a predetermined distance from a central position in a top surface of the connecting rod 31.

[0118] Specifically, the connecting rod assembly 30 drives the capsule body 91 to move; when the capsule cavity 912 is compressed by the connecting rod assembly 30, the water inlet valve block 26 closes the water inlet hole 236 while the diaphragm assembly 25 opens the water outlet hole 235, such that the fluid in the capsule cavity 912 enters the water outlet cavity 211 through the water outlet hole 235; when the capsule cavity 912 is stretched and expanded by the connecting rod assembly 30, the water inlet valve block 26 opens the water inlet hole 236 while the diaphragm assembly 25 closes the water outlet hole 235, such that the fluid in the water inlet cavity 212 enters the capsule cavity 912 through the water inlet hole 236.

[0119] During the movement of the connecting rod 31 in the up-and-down direction, due to the presence of the stopping member 241, it is possible to effectively avoid a phenomenon of unstable flow caused by an upward drifting of the connecting rod 31 when the connecting rod 31 drives the capsule body 91 to move, and hence a purpose of precise control over the flow is also achieved.

[0120] For example, the lower end face of the stopping member 241 is spaced apart from the central position in the top surface of the connecting rod 31 at a distance of 0.1-0.4 mm. That is, the distance of upward movement of the connecting rod 31 ranges from 0.1 mm to 0.4 mm. That is, the connecting rod 31 squeezes the capsule cavity 912 upwards at an extent of 0.1-0.4 mm. In other words, the top surface of the connecting rod 31 is always spaced from the lower end face of the stopping member 241 at a certain distance, in which the lower end face of the stopping member 241 represents an upper movement dead point of the connecting rod 31, and upon the connecting rod 31 touches the lower end face of the stopping member 241, the connecting rod 31 is restricted from continuing moving upwards, such that it is possible to ensure that the amount of compression of the capsule cavity 912 compressed or stretched by the connecting rod 31 is substantially constant every time, thereby stabilizing the flow of the diaphragm pump 100.

[0121] In some embodiments of the present disclosure, referring to FIGS. 12 and 13, the capsule body 91 includes the plurality of capsule cavities 912, the panel 911 and the mounting column 915. The plurality of capsule cavities 912 are open upwards. The panel 911 is connected to respective upper edges of the plurality of capsule cavities 912, such that the plurality of capsule cavities 912 are connected into a whole. The fact that the panel 911 connects the capsule cavities 912 into a whole makes the processing simple and the mounting efficient, and saves both time and labor.

[0122] Since the capsule body 91 is frequently squeezed and stretched, the plurality of capsule cavities 912 of the capsule body 91 which are integrally molded are associated with each other, which renders high fatigue durability to the capsule body 91.

[0123] The mounting column 915 is mounted to a bottom of the capsule cavity 912, and the connecting rod 31 is provided with a second mounting hole 311 fitted with the mounting column 915. The mounting column 915 passes through the second mounting hole 311 to be connected with the connecting rod 31, in which a radial dimension of the mounting column 915 is greater than a radial dimension of the second mounting hole 311, such that the connecting rod 31 during the movement will drive the capsule body 91 to realize stretch or compression of the capsule body 91.

[0124] In some embodiments of the present disclosure, referring to FIG. 13, the capsule cavity 912 includes a thin-walled part 914 and a thick-walled part 913. The upper end of the mounting column 915 is connected with a bottom surface of the thin-walled part 914. A circumferential edge of a lower end of the thick-walled part 913 is connected with a circumferential edge of an upper end of the thin-walled part 914, and a circumferential edge of an upper end of the thick-walled part 913 is connected with a bottom surface of the panel 911. It could be understood that due to the connection between the thin-walled part 914 and the mounting column 915, the mounting column 915 will drive the thin-walled part 914 to move, in which case the thin-walled part 914 is required to have good elasticity and stretchability to achieve the stretch and compression of the capsule body 91. It is known to all that in a certain range, a relatively thin object has better elasticity, so the part connected with the mounting column 915 is designed as the thin-walled part 914. On the contrary, the upper end of the thick-walled part 913 is connected with the panel 911, and the thick-walled part 913 is required to support the capsule cavity 912. Thus, the thick-walled part 913 not only plays a stabilizing and positioning role, but also ensures that the thick-walled part 913 will not exhibit a phenomenon of distortion or even displacement during operation of the diaphragm pump 100.

[0125] In some optional embodiments, a wall thickness of the thick-walled part 913 is larger than that of the thin-walled part 914. The lower end of the thick-walled part 913 is connected with the upper end of the thin-walled part 914, so the difference in wall thickness between the thick-walled part 913 and the thin-walled part 914 should not be too large. For example, when the difference is 0.2 mm, smooth transition between the thick-walled part 913 and the thin-walled part 914 can be attained. Thus, the capsule cavity 912 can have better stability and maintain good deformability, and hence the diaphragm pump 100 can have a stable output flow.

[0126] In a specific embodiment of the present disclosure, the cylinder body 24 has the first mounting hole 243, and the capsule body 91 is snapped into the first mounting hole 243 and immobilized relative to the first mounting hole 243.

[0127] In some other optional embodiments of the present disclosure, as shown in FIG. 10, a second positioning column 242 is provided to a top surface of the cylinder body 24 and extends upwards, and the panel 911 is provided with a second positioning hole 9110 fitted with the second positioning column 242.

[0128] In a specific embodiment of the present disclosure, a radial dimension of the second positioning column 242 is greater than that of the second positioning hole 9110.

[0129] In other words, the thick-walled part 913 is in interference fit with the first mounting hole 243, such that the capsule body 91 will not rotate in a circumferential direction of the first mounting hole 243 but have a stable mutual positional relationship. In addition, the second positioning column 242 of the cylinder body 24 passes through the second positioning hole 9110 to be connected with the capsule body 91, and hence the capsule body 91 will not be displaced. The interference fit between the second positioning column 242 and the second positioning hole 9110 ensures stable connection between the capsule body 91 and the cylinder body 24.

[0130] In some embodiments of the present disclosure, as shown in FIGS. 1, 2, 3 and 15, the diaphragm pump 100 includes the pump body 20, the piston assembly 90, the water inlet valve block 26 and the diaphragm assembly 25. The pump body 20 includes the upper cover 22, the valve seat 23 and the cylinder body 24 which are connected in sequence. The valve seat 23 has the water outlet hole 235, and a columnar boss 237 is provided to the bottom surface of the valve seat 23 and extends downwards. The columnar boss 237 has the water inlet hole 236 penetrating through the bottom and top surfaces of the valve seat 23. A circumferential wall of the columnar boss 237 extends obliquely from up to down to form a first inclined surface 2370.

[0131] The upper cover 22 and the valve seat 23 construct the water inlet cavity 212 located outside and the water outlet cavity 211 located inside, the water inlet cavity 212 is communicated with the capsule cavity 912 through the water inlet hole 236, and the water outlet cavity 211 is communicated with the capsule cavity 912 through the water outlet hole 235. The water inlet valve block 26 is provided to a bottom surface of the columnar boss 237 to open or close the water inlet hole 236, and the diaphragm assembly 25 is provided to the top surface of the valve seat 23 to open or close the water outlet hole 235.

[0132] As shown in FIG. 12, the piston assembly 90 includes the capsule body 91 and the panel 911. The capsule body 91 has the capsule cavity 912 open upwards, and an upper inner circumferential edge of the capsule cavity 912 extends obliquely from up to down to form a second inclined surface 9120. The first inclined surface 2370 is closely fitted with the second inclined surface 9120. The panel 911 is connected to an upper outer circumferential edge of the capsule cavity 912 and located between the valve seat 23 and the cylinder body 24.

[0133] Specifically, the upper cover 22 and the valve seat 23 are fitted to define the water inlet cavity 212 and the water outlet cavity 211. The connecting rod assembly 30 drives the capsule body 91 to move; when the capsule cavity 912 is compressed by the connecting rod assembly 30, the water inlet valve block 26 closes the water inlet hole 236 while the diaphragm assembly 25 opens the water outlet hole 235, such that the fluid in the capsule cavity 912 enters the water outlet cavity 211 through the water outlet hole 235; when the capsule cavity 912 is stretched and expanded by the connecting rod assembly 30, the water inlet valve block 26 opens the water inlet hole 236 while the diaphragm assembly 25 closes the water outlet hole 235, such that the fluid in the water inlet cavity 212 enters the capsule cavity 912 through the water inlet hole 236.

[0134] When the valve seat 23 is fastened over the cylinder body 24, as shown in FIGS. 12, 14, 15 and 16, the first inclined surface 2370 of the columnar boss 237 of the valve seat 23 is fitted with the second inclined surface 9120 of the piston assembly 90 seamlessly. When the connecting rod assembly 30 compresses the capsule body 91, a small space is defined between the capsule body 91 and the bottom of the valve seat 23, i.e. a compression space of the capsule cavity 912 is constant, which ensures that the diaphragm pump 100 can produce sufficient pressure for each compression, thereby improving working efficiency of the diaphragm pump 100, and stabilizing the output flow of the diaphragm pump 100.

[0135] Therefore, in the diaphragm pump 100 according to the present disclosure, since the columnar boss 237 is provided to the bottom surface of the valve seat 23 and extends downwards, the circumferential wall of the columnar boss 237 extends obliquely from up to down to form the first inclined surface 2370, and the upper inner circumferential edge of the capsule cavity 912 extends obliquely from up to down to form the second inclined surface 9120, in which the first inclined surface 2370 is closely fitted with the second inclined surface 9120, the diaphragm pump 100 can compress the fluid effectively and its working efficiency can be improved.

[0136] In some embodiments of the present disclosure, referring to FIGS. 14, 15 and 16, the columnar boss 237 has a third positioning hole 2371 configured to immobilize the water inlet valve block 26, and a plurality of water inlet holes 236 are defined in a circumferential direction of the third positioning hole 2371.

[0137] In an optional embodiment, as shown in FIG. 17, the water inlet valve block 26 includes a valve membrane 261 and a third positioning column 262. The valve membrane 261 covers the water inlet hole 236, and the third positioning column 262 has a first end connected to the valve membrane 261 and a second end upwardly extending through the third positioning hole 2371.

[0138] The third positioning column 262 at an upper end of the water inlet valve block 26 is disposed through the third positioning hole 2371, such that the water inlet valve block 26 is fixedly mounted to the valve seat 23, in which case the valve membrane 261 at a lower end of the water inlet valve block 26 closes the water inlet hole 236. When the connecting rod assembly 30 stretches the capsule body 91, the water inlet valve block 26 opens the water inlet hole 236 and the fluid is sucked into the capsule cavity 912. When the diaphragm pump 100 operates, the plurality of small water inlet holes 236 effectively disperse the fluid in the water inlet cavity 212, restraining the production of a turbulent flow, and hence the diaphragm pump 100 can output the flow rate stably.

[0139] In an optional embodiment, as shown in FIGS. 15 and 17, the first end of the third positioning column 262 forms an anti-rotation flange 263, and the third positioning hole 2371 has a position-limiting groove 2372 fitted with the anti-rotation flange 263. The anti-rotation flange 263 of the water inlet valve block 26 is fitted with the position-limiting groove 2372 of the third positioning hole 2371 to limit a degree of freedom of the water inlet valve block 26 in the circumferential direction, such that the water inlet valve block 26 cannot rotate in the circumferential direction.

[0140] In another optional embodiment, as shown in FIGS. 3, 16 and 17, the second end of the third positioning column 262 is provided with a position-limiting protrusion 264, and the position-limiting protrusion 264 abuts against the top surface of the valve seat 23. That is, an outer diameter of the position-limiting protrusion 264 is larger than an inner diameter of the third positioning hole 2371, and after the third positioning column 262 passes through the third positioning hole 2371, a bottom of the position-limiting protrusion 264 abuts against the top surface of the valve seat 23. In other words, the water inlet valve block 26 is clamped to the valve seat 23. A degree of freedom of the water inlet valve block 26 in an axial direction is limited, and the water inlet valve block 26 cannot be disengaged from the valve seat 23 in the axial direction. The water inlet valve block 26 is made of a material having deformability, for example, rubber, such that the position-limiting protrusion 264 can passes through the third positioning hole 2371 smoothly after squeezed and deformed.

[0141] In some embodiments of the present disclosure, as shown in FIG. 14, the columnar boss 237 has an avoidance notch 2373, and an inlet end of the water outlet hole 235 is arranged opposite to the avoidance notch 2373. That is, an inlet end face of the water outlet hole 235 is not in the same plane as an outlet end face of an outlet end of the water inlet hole 236, so it is ensured that a water inlet passage and a water outlet passage are effectively separated.

[0142] In some optional embodiments, as shown in FIGS. 14 and 16, three columnar bosses 237 are provided to the bottom surface of the valve seat 23, and constitute an equilateral triangle. Certainly, it could be understood that the position and number of the columnar boss 237 is determined based on the position and number of the capsule cavity 912. Embodiments of the present disclosure are only explanatory. For example, the number of the columnar bosses 237 can be set to four, and four columnar bosses 237 constitute a square or other shapes. The regular arrangement of the columnar bosses 237 allows the valve seat 23 to be processed simply and reduces material costs.

[0143] In some embodiments of the present disclosure, the connecting rod assembly 30 for the diaphragm pump 100 includes the connecting rod 31 and the steel shaft 32, as shown in FIGS. 2, 18, 21 and 23. The connecting rod 31 includes a rod body 312 and a mounting plate 313. A first end of the rod body 312 is provided with the connecting hole 3121 extending along an axial direction of the rod body 312, and the mounting plate 313 is connected to a second end of the rod body 312. A plurality of connecting arms 314 are spaced along a circumferential direction of the mounting plate 313, and the mounting plate 313 has a plurality of material-reducing holes 3131. The steel shaft 32 is connected with the connecting hole 3121.

[0144] Specifically, as shown in FIG. 23, the steel shaft 32 has the lower end connected with the driving assembly 10 and the upper end inserted into the connecting hole 3121. An inner diameter D of the connecting hole 3121 is adapted to a diameter of the steel shaft 32. For example, the inner diameter D of the connecting hole 3121 can be 1.52 mm. Certainly, the embodiments of the present disclosure are only explanatory, and the inner diameter D can be set to other values in the light of practical situations. The driving assembly 10 drives the steel shaft 32 to rotate, the plurality of connecting arms 314 are connected to the mounting column 915 respectively, and the steel shaft 32 drives the connecting rod 31 to rotate, such that the stretch and compression of the capsule body 91 by the connecting rod assembly 30 are realized.

[0145] The inventor finds in practice that since the mounting plate 313 is provided with the connecting hole 3121 in the center, during a molding process of the connecting rod 31, shrinkage or insufficient molding may occur to the periphery of the connecting hole 3121 due to unevenness in thickness, resulting in generation of air bubbles. In order to solve this problem, the plurality of material-reducing holes 3131 are provided around the connecting hole 3121, correspondingly, a loose core is additionally provided to a mold, and an exhaust passage keeps unobstructed to exhaust most of the air generated by uneven shrinkage out of the mold, such that the air bubbles generated during the molding process of the connecting rod 31 can be reduced.

[0146] For the connecting rod assembly 30 of the diaphragm pump 100 according to the present disclosure, by providing the plurality of material-reducing holes 3131 in the mounting plate 313, it is possible to reduce the air bubbles generated during the molding process of the connecting rod 31 and prolong service life of the connecting rod 31.

[0147] In some embodiments of the present disclosure, as shown in FIGS. 18 and 20, the material-reducing hole 3131 is formed by recessing a top surface of the mounting plate 313 downwardly. The inventor notes that during the molding process, an upper part of the connecting rod 31 is finally cooled, and if the material-reducing hole 3131 is provided in a lower part, the air cannot be exhausted when liquid metal is solidified and shrunk, which likewise results in the air bubbles due to an excessive wall thickness difference. Thus, the material-reducing hole 3131 is provided in the upper part instead of the lower part.

[0148] In some embodiments, as shown in FIG. 20, the plurality of connecting arms 314 obliquely extend downwards and outwards from the central position in the mounting plate 313. In other words, the connecting arms 314 are not in the same plane, and for example, an included angle C may be 8 degrees. Certainly, the embodiments of the present disclosure are only explanatory, and the included angle C between the connecting arm 314 and the horizontal plane can be set according to practical situations.

[0149] For example, the connecting rod includes three connecting arms 314. Since the connecting rod 31 compresses or stretches different capsule bodies 91 at the same time, the steel shaft 32 is configured as an eccentric shaft, and correspondingly, the connecting arms 314 are inclined downwards, such that no matter which position the steel shaft 32 rotates to, one of the connecting arms 314 stretches the capsule body 91, another connecting arm 314 compresses the capsule body 91, and the remaining capsule body 91 is either stretched or compressed, thereby realizing water intake and drainage processes of the diaphragm pump 100. Certainly, the embodiments of the present disclosure are only explanatory, and for example, four or more connecting arms 314 can be provided.

[0150] In some other embodiments, referring to FIGS. 19, 21, 22 and 23, a plurality of heat radiating grooves 3122 are provided to a circumferential face of the connecting hole 3121, and the plurality of heat radiating grooves 3122 extend along an axial direction of the connecting hole 3121. During the rotation of the connecting rod assembly 30, the steel shaft 32 rubs against the connecting rod 31, generating a lot of heat, and if the heat cannot be discharged in time, abrasion of the connecting rod assembly 30 will be aggravated, resulting in failure of the diaphragm pump 100. By providing the plurality of heat radiating grooves 3122 in a circumferential direction of the connecting hole 3121, the heat generated by friction between the steel shaft 32 and the connecting rod 31 can be discharged in time through the heat radiating grooves 3122, thereby prolonging a process of disabling the connecting rod assembly 30 due to abrasion and extending service life of the connecting rod assembly 30.

[0151] In some embodiments of the present disclosure, referring to FIGS. 18, 20 and 21, a free end of each connecting arm 314 is provided with a mounting protrusion 3141, and a lower end face of the mounting protrusion 3141 is lower than a lower end face of the connecting arm 314. The second mounting hole 311 is provided in the center of the mounting protrusion 3141, the mounting column 915 of the capsule body 91 passes through the second mounting hole 311 to be connected with the connecting rod 31, and an axial dimension of the second mounting hole 311 matches an axial dimension of the mounting column 915.

[0152] In some optional embodiments, as shown in FIG. 21, a reinforcing rib 315 is provided between an outer circumferential surface of the mounting protrusion 3141 and an outer circumferential surface of the rod body 312, and the reinforcing rib 315 extends upwards to be connected to a bottom surface of the mounting plate 313. Since the lower end face of the mounting protrusion 3141 is lower than that of the connecting arm 314, a protruding surface of the mounting protrusion 3141 is too large, and a connecting surface of the mounting protrusion 3141 itself can only withstand a limited load. In view of this, the reinforcing rib 315 is additionally provided to a common surface to which the mounting protrusion 3141 and the rod body 312 are both perpendicular, so as to enhance strength of a joint surface.

[0153] In some embodiments, as shown in FIGS. 1 and 3, the connecting rod assembly 30 is provided within the chamber 27. The connecting rod assembly 30 includes the eccentric wheel 33, the connecting rod 31 and the steel shaft 32. The eccentric wheel 33 is provided with an inclined eccentric hole 331 in an axial direction of the eccentric wheel 33, and the eccentric wheel 33 is connected with the electric motor shaft 121 of the electric motor 12.

[0154] As shown in FIG. 2, a photoelectric shielding sheet 40 is integrally formed with the eccentric wheel 33, that is, the photoelectric shielding sheet 40 and the eccentric wheel 33 are configured as a whole and are inseparable. Thus, a manufacturing process of the eccentric wheel 33 can be simplified, reducing assembly steps, and the photoelectric shielding sheet 40 is prevented from shaking or even dropping.

[0155] In an optional embodiment, as shown in FIG. 2, the photoelectric shielding sheet 40 is integrally formed with the eccentric wheel 33 and rotates synchronously with the eccentric wheel 33, in which the photoelectric shielding sheet 40 is disposed to an upper surface of the eccentric wheel 33. The photoelectric shielding sheet 40 can be provided with an inclined hole 41 corresponding to the eccentric hole 331 of the eccentric wheel 33. The lower end of the steel shaft 32 is inserted into the inclined hole 41 and the eccentric hole 331, while the upper end of the steel shaft 32 is connected with the connecting rod 31.

[0156] A photoelectric sensor 50 is provided to the base seat 11, and the photoelectric sensor 50 cooperates with the photoelectric shielding sheet 40, so as to detect a rotational speed of the electric motor shaft 121 and send a detection signal to an electric motor controller. The electric motor controller is configured to adjust the rotational speed of the electric motor shaft 121 of the electric motor 12 according to the detection signal.

[0157] As shown in FIG. 1 and FIG. 2, the photoelectric sensor 50 is disposed in the chamber 27, and the photoelectric sensor 50 is provided with a through groove throughout along a rotating piece of the photoelectric shielding sheet 40. The photoelectric shielding sheet 40 passes through the through groove when rotating, so as to detect the rotational speed of the electric motor shaft 121 and send the detection signal to the electric motor controller, such that the electric motor controller precisely controls the rotational speed of the electric motor shaft 121.

[0158] In the diaphragm pump 100 according to embodiments of the present disclosure, by forming the photoelectric shielding sheet 40 integrally with the eccentric wheel 33, the stability of the photoelectric shielding sheet 40 during rotation is improved, and the working noise and production cost of the diaphragm pump 100 is reduced.

[0159] In an optional embodiment, as shown in FIG. 2, the photoelectric shielding sheet 40 extends outwards along a radial direction of the eccentric wheel 33. The photoelectric sensor 50 is provided to an inner wall face of the base seat 11, and an opening of the through groove faces the inside. Thus, during the rotation of the eccentric wheel 33, the photoelectric shielding sheet 40 can extend into the through groove to play a role of shielding light.

[0160] In an optional embodiment, as shown in FIG. 1 and FIG. 2, the photoelectric shielding sheet 40 includes a positioning portion and a shielding portion. The positioning portion is provided to the upper surface of the eccentric wheel 33, and the shielding portion is connected to the positioning portion and extends radially outwards. The shielding portion can be configured as a fan shape, but it could be understood that the shape of the shielding portion is not limited and instead can be configured as other shapes in the light of practical situations. Thus, in the through groove of the photoelectric sensor 50, light can be effectively shielded by the shielding portion, so that the photoelectric sensor 50 can detect the rotational speed of the electric motor shaft 121 accurately.

[0161] In some further embodiments of the present disclosure, as shown in FIGS. 24 and 25, the diaphragm pump 100 further includes a printed circuit board 70. The printed circuit board 70 is provided to the base seat 11 and connected with the photoelectric sensor 50. The printed circuit board 70 is provided with a lead wire connector 71, and a lead wire 80 is electrically connected to the printed circuit board 70 through the lead wire connector 71. One of the lead wire 80 and the lead wire connector 71 is provided with a lead wire plug 81, while the other one of the lead wire 80 and the lead wire connector 71 is provided with a lead wire jack 711, the lead wire plug 81 being plugged into the lead wire jack 711.

[0162] The lead wire plug 81 may be provided to the lead wire 80. At the same time, the lead wire jack 711 is provided to the lead wire connector 71. By plugging the lead wire plug 81 of the lead wire 80 in the lead wire jack 711 of the lead wire connector 71 to complete the connection between the lead wire 80 and the lead wire connector 71, the electrical connection between the lead wire 80 and the printed circuit board 70 can be implemented, such that the lead wire 80 can transmit electric currents and signals to the photoelectric sensor 50 to ensure the normal operation of the diaphragm pump 100. When the lead wire 80 needs to be disassembled due to maintenance or other reasons, the lead wire 80 can be removed from the lead wire connector 71 directly. Thus, by providing the lead wire connector 71 to the printed circuit board 70, the connection and disassembly between the lead wire 80 and the printed circuit board 70 is convenient, and the cost is low.

[0163] Certainly, the lead wire plug 81 can be provided to the lead wire connector 71, and at the time the lead wire jack 711 is provided to the lead wire 80. By plugging the lead wire plug 81 of the lead wire connector 71 in the lead wire jack 711 of the lead wire 80, it is also convenient for the connection and disassembly between the lead wire 80 and the printed circuit board 70, and the cost of the diaphragm pump 100 is low.

[0164] For the diaphragm pump 100 according to embodiments of the present disclosure, the precise control over the flow of the diaphragm pump may be achieved; and by providing the lead wire connector 71 to the printed circuit board 70 and by plugging the lead wire plug 81 provided to one of the lead wire 80 and the lead wire connector 71 into the lead wire jack 7111 provided to the other one of the lead wire 80 and the lead wire connector 71, it is convenient for the connection and disassembly between the lead wire 80 and the printed circuit board 70, and the cost is low.

[0165] Other constructions of the diaphragm pump 100 according to embodiments of the present disclosure are well known to those skilled in the art and will not be elaborated herein.

[0166] In the specification, it is to be understood that terms such as "upper," "lower," "bottom," "inner," "outer," should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present invention be constructed or operated in a particular orientation, thus these relative terms should not be construed as a limit to the present disclosure. In the present invention, unless specified or limited otherwise, a structure in which a first feature is "on" or "below" a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween. Furthermore, a first feature "on," "above," or "on top of" a second feature may include an embodiment in which the first feature is right or obliquely "on," "above," or "on top of" the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature "below," "under," or "on bottom of" a second feature may include an embodiment in which the first feature is right or obliquely "below," "under," or "on bottom of" the second feature, or just means that the first feature is at a height lower than that of the second feature.

[0167] Reference throughout this specification to "an embodiment," "some embodiments," "an example," "a specific example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in one embodiment", "in an embodiment", "in another example," "in an example," "in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0168] Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, modifications, alternatives and variants can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.

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