CN219654855U

CN219654855U - Miniature electric diaphragm pump

Info

Publication number: CN219654855U
Application number: CN202321379762.8U
Authority: CN
Inventors: 王芳林
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-09-08
Anticipated expiration: 2033-06-01

Abstract

The utility model relates to the field of diaphragm pumps, and discloses a miniature electric diaphragm pump, which comprises: the pump body, disk seat and pump cover, the disk seat is arranged in between the pump body and the pump cover, be provided with the diaphragm between disk seat and the pump body, pump body coupling has the motor, the output shaft of motor is eccentric to be provided with the wobble plate subassembly, wobble plate subassembly and diaphragm coupling, the motor is including installing the casing, the pump body is arranged in between installation casing and the pump cover, through first bolt fastening between pump cover and the installation casing, first bolt is provided with a plurality of and annular equidistant distributions, through second bolt fastening between pump cover and the pump body, the central point in the region surrounded by a plurality of first bolts is arranged in to the second bolt. The miniature electric diaphragm pump has the advantages that the pump cover is firmly installed and is not easy to bend and deform, a plurality of sealing parts such as sealing rings and diaphragms can be firmly pressed, the sealing effect is ensured, and the problem of leakage is avoided.

Description

Miniature electric diaphragm pump

Technical Field

The utility model relates to the field of diaphragm pumps, in particular to a miniature electric diaphragm pump.

Background

The miniature electric diaphragm pump has the characteristics of compact structure, small volume and light weight, and is widely applied to various fluid conveying fields, such as sprayers, water dispensers, coffee machines and other devices; at present, an electric diaphragm pump mainly converts rotary motion into up-down or left-right motion of a rubber part through an eccentric mechanism, negative pressure is formed in a diaphragm cavity through the action of two one-way valves, water is sucked into a water pump from the outside through atmospheric pressure, and the diaphragm cavity forms larger pressure to press out the water through continuous motion of the diaphragm, so that circulation is formed.

In the existing miniature electric diaphragm pumps, during high-pressure working or in a shutdown pressure maintaining state, the pump cover is easy to bend and deform due to high internal water pressure, so that sealing components such as a water outlet sealing ring and a diaphragm cannot be firmly pressed (the compression amount is reduced), internal leakage (namely, liquid in a high-pressure area flows back to a low-pressure area) can occur, flow is reduced (working efficiency is reduced) during high-pressure working, or the problem that the water pump is not stopped and started due to the fact that the pressure cannot be maintained in the high-pressure shutdown state is solved.

Disclosure of Invention

First, the technical problem to be solved

The utility model aims to solve the problem of providing a miniature electric diaphragm pump, wherein a pump cover is firmly installed and is not easy to bend and deform, a plurality of sealing rings, diaphragms and other sealing components can be firmly pressed, the sealing effect is ensured, and the problem of leakage is avoided.

(II) technical scheme

In order to solve the technical problem, the utility model provides a miniature electric diaphragm pump, which comprises: the pump comprises a pump body, a valve seat and a pump cover, wherein the valve seat is arranged between the pump body and the pump cover, a diaphragm is arranged between the valve seat and the pump body, the pump body is connected with a motor, an output shaft of the motor is eccentrically provided with a wobble plate assembly, the wobble plate assembly is connected with the diaphragm, and the wobble plate assembly drives the diaphragm to move, so that the functions of sucking water and pressing water are realized; the motor comprises a mounting shell, the pump body is arranged between the mounting shell and the pump cover, the pump cover and the mounting shell are fixed through a first bolt, the first bolt penetrates through the pump body, and an internal thread for mounting the first bolt is arranged on the mounting shell; the first bolts are arranged in a plurality of annular equidistant modes, so that each first bolt is uniformly stressed, and the pump cover is more stably installed; the pump cover is fixed with the pump body through the second bolt, the second bolt is arranged in a plurality of the central positions of the areas surrounded by the first bolts, and the central position of the pump cover is reinforced through the second bolt at the center, so that the pump cover is stably installed and can firmly press a plurality of sealing parts such as sealing rings and diaphragms, the sealing effect is guaranteed, and the problem of leakage is avoided.

Further, a first installation guide post for installing the second bolt is arranged on the pump cover, a second installation guide post for installing the second bolt is arranged on the pump body, and the first installation guide post abuts against the side end of the second installation guide post.

Further, a plurality of first convex ribs are annularly arranged on the outer wall of the first installation guide post, and the side ends of the first convex ribs are propped against the valve seat.

Further, the pump cover is annularly provided with a second convex rib, the valve seat is provided with an annular groove corresponding to the second convex rib, a first sealing ring is arranged in the annular groove, a first sealing bulge is formed at the side end of the second convex rib, and the first sealing bulge falls into the annular groove to compress the first sealing ring.

Further, a plurality of water inlet valve plates and a plurality of water outlet valve plates are arranged on the valve seat, and a plurality of limit guide posts corresponding to the water outlet valve plates are arranged on the pump cover.

Further, a sealing convex rib is formed on one side, close to the valve seat, of the diaphragm, a groove corresponding to the sealing convex rib is formed in the valve seat, a second sealing protrusion is formed in the groove, and the second sealing protrusion is arranged at the side end of the sealing convex rib.

Further, a second sealing ring is arranged between the second bolt and the pump cover, and a third sealing ring and a fourth sealing ring are arranged between the pump cover and the valve seat.

Further, a third installation guide post for installing the first bolt is arranged on the pump cover, a plurality of reinforcing ribs are arranged at the side end, away from the pump body, of the pump cover, and one end of each reinforcing rib is integrally formed with the third installation guide post.

Further, the wobble plate assembly comprises a wobble plate support and a wobble plate bushing, the wobble plate support is fixed with the wobble plate bushing through a third bolt, an arc-shaped mounting block is arranged on the wobble plate bushing, a mounting groove corresponding to the arc-shaped mounting block is formed in the diaphragm, the wobble plate support is made of metal, and the wobble plate bushing is made of nonmetal.

Furthermore, the wobble plate support is made of die-casting aluminum alloy, and the wobble plate bushing is made of POM.

Further, a diaphragm reinforcing rib is arranged on one side, close to the pump body, of the diaphragm, and a pump body groove corresponding to the diaphragm reinforcing rib is formed in the pump body.

Further, a low-pressure water inlet cavity and a high-pressure water outlet cavity are formed in the pump cover, a backflow protection device is arranged on one side of the pump cover, the backflow protection device comprises a backflow cover fixedly connected with the pump cover and a backflow valve core, a backflow cavity communicated with the water outlet cavity is formed between the backflow cover and the pump cover, a first channel is communicated between the backflow cavity and the water outlet cavity, a second channel is communicated between the backflow cavity and the water inlet cavity, a compression spring is arranged between the backflow valve core and the backflow cover, the backflow valve core corresponds to the first channel, and the backflow valve core is used for opening/blocking the first channel.

(III) beneficial effects

According to the miniature electric diaphragm pump, the pump cover is stably installed and is not easy to bend and deform, the central part of the pump cover is reinforced through the second bolt at the center, so that the pump cover is stably installed and can firmly press a plurality of sealing parts such as the sealing rings and the diaphragms, the sealing effect is ensured, and the problem of leakage is avoided; the first convex ribs play a role in reinforcing structural strength of the first mounting guide posts to a certain extent, so that the first mounting guide posts are not easy to deform; meanwhile, the side end of the first convex rib is abutted against the valve seat, so that the pump cover and the valve seat are stably installed; the diaphragm is provided with a sealing convex rib, the valve seat is provided with a groove, a second sealing bulge is formed in the groove, and the second sealing bulge is arranged at the side end of the sealing convex rib to laterally press the sealing convex rib, so that the sealing effect is improved; the wobble plate assembly is of a split type design, and is in contact with the diaphragm through the wobble plate bushing made of non-metal materials, so that the heat insulation effect is good, and the service life of the diaphragm is prolonged; the side end of the pump cover, which is far away from the pump body, is provided with a plurality of reinforcing ribs, and the reinforcing ribs play a role in reinforcing structural strength on the pump cover, so that the pump cover is not easy to bend and deform, and leakage is further avoided; the wobble plate support is made of die-casting aluminum alloy, the wobble plate bushing is made of POM (pre-oriented metal alloy), the POM has good self-lubricating property, and the service life of the diaphragm can be prolonged due to the contact between the diaphragm and the wobble plate bushing; and a backflow protection device is arranged to prevent water leakage of the water pump caused by overvoltage damage of related parts of the water pump.

Drawings

FIG. 1 is a perspective view of a miniature electric diaphragm pump of the present utility model;

FIG. 2 is a cross-sectional view of a miniature electric diaphragm pump of the present utility model;

fig. 3 is an enlarged view of a portion a in fig. 2;

fig. 4 is an enlarged view of a portion B in fig. 2;

FIG. 5 is an exploded view of a miniature electric diaphragm pump of the present utility model;

FIG. 6 is a schematic diagram of the pump cover of the miniature electric diaphragm pump of the present utility model;

FIG. 7 is a schematic view of a valve seat of a miniature electric diaphragm pump according to the present utility model;

FIG. 8 is a schematic diagram of a portion of a wobble plate assembly of a miniature electric diaphragm pump of the present utility model;

FIG. 9 is a cross-sectional view of a portion of a wobble plate assembly of a miniature electric diaphragm pump of the present utility model;

FIG. 10 is a schematic view of the structure of the mounting groove of the miniature electric diaphragm pump of the present utility model;

FIG. 11 is a schematic view of a miniature electric diaphragm pump of the present utility model;

FIG. 12 is a perspective view of a second embodiment of a miniature electric diaphragm pump of the present utility model;

FIG. 13 is a cross-sectional view of a second embodiment of a miniature electric diaphragm pump of the present utility model;

fig. 14 is an enlarged view of a portion C in fig. 13;

FIG. 15 is a schematic view of a micro electro-mechanical diaphragm pump according to a second embodiment of the present utility model in which the return valve element is open;

the corresponding component names for each reference number in the figures are: the pump body is 1, the second mounting guide post is 101, the valve seat is 2, the annular groove is 201, the water inlet valve plate is 202, the water outlet valve plate is 203, the groove is 204, the second sealing bulge is 205, the pump cover is 3, the first mounting guide post is 301, the first convex rib is 302, the second convex rib is 303, the first sealing ring is 304, the first sealing bulge is 305, the third mounting guide post is 306, the limit guide post is 307, the diaphragm is 4, the sealing convex rib is 401, the mounting groove is 402, the motor is 5, the mounting shell is 501, the wobble plate bracket is 61, the wobble plate bushing is 62, the arc-shaped mounting block is 621, the third bolt is 63, the first bolt is 7, the second bolt is 8, the second sealing ring is 9, the third sealing ring is 10, the fourth sealing ring is 11, the reinforcing rib is 12, the water inlet cavity is 13, the water inlet pipe is 131, the water outlet cavity is 14, the water outlet cavity is 141, the pressure cavity is 15, the diaphragm is 16, the groove is 17, the reflux cover is 18, the reflux cavity is 19, the reflux cavity is 20, the first channel is 21, the reflux core element is 21, the valve core seat is 212, the valve core seat is 23, the valve core seat is 23, and the compression valve core seat is the valve core seat.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

Embodiment one:

referring to fig. 1-10, a first embodiment of the present utility model provides a micro-electro-mechanical diaphragm pump, comprising: the pump comprises a pump body 1, a valve seat 2 and a pump cover 3, wherein the valve seat 2 is arranged between the pump body 1 and the pump cover 3, a diaphragm 4 is arranged between the valve seat 2 and the pump body 1, the pump body 1 is connected with a motor 5, an output shaft of the motor 5 is eccentrically provided with a wobble plate assembly, the wobble plate assembly is connected with the diaphragm 4, and the wobble plate assembly drives the diaphragm 4 to move, so that the functions of sucking water and pressing water are realized; the motor 5 comprises a mounting shell 501, the pump body 1 is arranged between the mounting shell 501 and the pump cover 3, the pump cover 3 and the mounting shell 501 are fixed through a first bolt 7, the first bolt 7 penetrates through the pump body 1, and the mounting shell 501 is provided with internal threads for mounting the first bolt 7; the first bolts 7 are arranged in a plurality of annular equidistant modes, so that the stress of each first bolt 7 is uniform, the pump cover 3 is more stably installed, and in the embodiment, the first bolts 7 are arranged in five modes; the pump cover 3 and the pump body 1 are fixed through the second bolts 8, the second bolts 8 are arranged at the central positions of the areas surrounded by the first bolts 7, and the central positions of the pump cover 3 are reinforced through the second bolts 8 at the central positions, so that the pump cover 3 is stably installed and can firmly press a plurality of sealing parts such as sealing rings and diaphragms, the sealing effect is ensured, and the leakage problem is avoided.

Referring to fig. 1-4, a first installation guide post 301 for installing a second bolt 8 is arranged on a pump cover 3, a second installation guide post 101 for installing the second bolt 8 is arranged on a pump body 1, the second bolt 8 is firmly installed, the first installation guide post 301 and the second installation guide post 101 are hollow, and internal threads corresponding to the second bolt 8 are arranged in the second installation guide post 101; the first mounting guide post 301 is abutted against the side end of the second mounting guide post 101, so that the structure is stable and is not easy to deform; a plurality of first convex ribs 302 are annularly and equidistantly arranged on the outer wall of the first mounting guide post 301, the side ends of the first convex ribs 302 are abutted against the valve seat 2, and the first convex ribs 302 play a role in reinforcing the structural strength of the first mounting guide post 301, so that the first mounting guide post 301 is not easy to deform; while the side end of the first rib 302 abuts against the valve seat 2 so that the installation between the pump cover 3 and the valve seat 2 is stable.

Referring to fig. 1, 2 and 6, a second convex rib 303 is annularly arranged on the pump cover 3, the second convex rib 303 separates the inner cavity of the pump cover 3 to form a water inlet cavity 13 and a water outlet cavity 14, when the pump cover works, the water inlet cavity 13 sucks low-pressure water, and the water outlet cavity 14 presses high-pressure water out; the valve seat 2 is provided with the annular groove 201 corresponding to the second convex rib 303, the annular groove 201 is internally provided with the first sealing ring 304, the side end of the second convex rib 303 is provided with the first sealing bulge 305, and the first sealing bulge 305 falls into the annular groove 201 to compress tightly the first sealing ring 304, so that the sealing effect is good, and leakage between the water inlet cavity 13 and the water outlet cavity 14 is avoided.

Referring to fig. 1, 2, 3 and 6, a plurality of water inlet valve plates 202 and a plurality of water outlet valve plates 203 are installed on the valve seat 2, and a water inlet pipe 131 communicated with the water inlet cavity 13 and a water outlet pipe 141 communicated with the water outlet cavity 14 are arranged on the pump cover 3; the water inlet valve plate 202 and the water outlet valve plate 203 are in the prior art, and are not described herein; the pump cover 3 is provided with a plurality of limit guide posts 307 corresponding to the water outlet valve plate 203 so as to limit the water outlet valve plate 203 and prevent the water outlet valve plate 203 from being flushed out of the valve seat 2 by high pressure; a pressure cavity 15 is formed between the diaphragm 4 and the valve seat 2, and the pressure of the pressure cavity 15 is changed by the movement of the diaphragm 4 to form a negative pressure or high pressure state; when low-pressure water is sucked, the pressure cavity 15 is in a negative pressure state, the water inlet valve plate 202 is opened, the water outlet valve plate 203 is closed, and water in the water inlet cavity 13 is sucked into the pressure cavity 15; when high-pressure water is pressed out, the pressure cavity 15 is in a negative pressure state, the water inlet valve plate 202 is closed, the water outlet valve plate 203 is opened, water in the pressure cavity 15 is pressed out to the water outlet cavity 14, and finally higher-pressure water is output through the water outlet pipe 141.

Referring to fig. 1, 2 and 8, a sealing rib 401 is formed on one side of the diaphragm 4, which is close to the valve seat 2, a groove 204 corresponding to the sealing rib 401 is formed on the valve seat 2, a second sealing protrusion 205 is formed in the groove 204, and the second sealing protrusion 205 is disposed at the side end of the sealing rib 401 to laterally press the sealing rib 401, so that the sealing effect is improved.

Referring to fig. 1-4, a second sealing ring 9 is arranged between the second bolt 8 and the pump cover 3, a third sealing ring 10 and a fourth sealing ring 11 are arranged between the pump cover 3 and the valve seat 2, the tightness is good, and the first sealing ring 304 is a water outlet sealing ring and mainly plays a sealing role in water outlet; the fourth sealing ring 11 is a water inlet sealing ring and mainly plays a sealing role in water outlet; the pump cover 3 is provided with a third installation guide post 306 for installing the first bolt 7, the side end of the pump cover 3 far away from the pump body 1 is provided with a plurality of reinforcing ribs 12, and one end of each reinforcing rib 12 and the third installation guide post 306 are integrally formed; the reinforcing ribs 12 play a role in reinforcing structural strength of the pump cover 3, so that the pump cover 3 is not easy to bend and deform, and leakage is further avoided.

Referring to fig. 2, 8, 9 and 10, the wobble plate assembly includes a wobble plate bracket 61 and a wobble plate bushing 62, the wobble plate bracket 61 and the wobble plate bushing 62 are fixed by a third bolt 63, and an internal thread for installing the third bolt 63 is provided on the wobble plate bracket 61; the swing disc bush 62 is provided with an arc-shaped mounting block 621, the diaphragm 4 is provided with a mounting groove 402 corresponding to the arc-shaped mounting block 621, and the arc-shaped mounting block 621 is correspondingly arranged in the mounting groove 402 so that the arc-shaped mounting block 621 drives the diaphragm 4 to move; the wobble plate support 61 is made of metal, has high structural strength and is not easy to deform; wobble plate bushing 62 is a non-metallic material, specifically a plastic material; good heat insulation effect (compared with metal materials); the prior wobble plate is of an integrated metal structure (generally made of aluminum alloy materials and high in heat conductivity coefficient), heat transmitted by a motor and heat generated by friction of a wobble plate bearing can cause the wobble plate to be very hot, and direct contact with a diaphragm can soften the diaphragm to reduce the strength of the diaphragm, so that the service life of the diaphragm is reduced; the wobble plate assembly in the embodiment adopts a split design, and the wobble plate bushing 62 made of non-metal materials (with smaller heat conductivity coefficient) is in contact with the diaphragm 4, so that the heat insulation effect is good, and the service life of the diaphragm 4 is prolonged; the wobble plate support 61 is made of die-casting aluminum alloy, the wobble plate bushing 62 is made of POM (polyoxymethylene), the POM has good self-lubricating property, and the service life of the diaphragm 4 can be prolonged due to the contact between the diaphragm 4 and the wobble plate bushing 62; the prior wobble plate is generally made of aluminum alloy, the surface of the wobble plate is rough, and the abrasion of the diaphragm can be accelerated when the wobble plate is directly contacted with the diaphragm 4; in this embodiment, the membrane 4 is made of TPV (thermoplastic vulcanizate), and has good properties of impact resistance, aging resistance, heat resistance, etc., and long service life.

Referring to fig. 10 and 11, a diaphragm reinforcement rib 16 is arranged on one side of the diaphragm 4, which is close to the pump body 1, and a pump body groove 17 corresponding to the diaphragm reinforcement rib 16 is arranged on the pump body 1; during installation, the diaphragm reinforcing ribs 16 are embedded into the pump body grooves 17, the wobble plate support 61 moves to pull the diaphragm 4 during water pump operation, the diaphragm reinforcing ribs 16 are embedded into the pump body grooves 17, the sealing convex ribs 401 of the diaphragm 4 are embedded into the grooves 204 of the valve seat 2, displacement and deformation are not easy to occur around the diaphragm 4, and therefore the sealing effect and fixation are more reliable.

Embodiment two:

referring to fig. 12 to 15, the second embodiment is different from the first embodiment in that: one side of the pump cover 3 is provided with a backflow protection device, the backflow protection device comprises a backflow cover 18 fixedly connected with the pump cover 3 and a backflow valve core 21, and the backflow cover 18 is fixed with the pump cover 3 through bolts; a backflow cavity 19 communicated with the water outlet cavity 14 is formed between the backflow cover 18 and the pump cover 3, a first channel 20 is communicated between the backflow cavity 19 and the water outlet cavity 14, a second channel 23 is communicated between the backflow cavity 19 and the water inlet cavity 13, a compression spring 22 is arranged between the backflow valve core 21 and the backflow cover 18, the backflow valve core 21 corresponds to the first channel 20, the backflow valve core 21 is used for opening/sealing the first channel 20, the backflow valve core 21 comprises a valve core seat 211 and a valve core piece 212 arranged on the valve core seat 211, the valve core seat 211 is made of PP material, the valve core piece 212 is made of rubber or silica gel material, the sealing effect is achieved, one end of the compression spring 22 is abutted against the valve core seat 211, and the other end of the compression spring 22 is abutted against the backflow cover 18; the reflux protection device has the functions that: when the water pressure of the water outlet cavity 14 exceeds a preset safety value, the water pressure rushes out the backflow valve core 21, the backflow valve core 21 is opened, so that high-pressure water in the water outlet cavity 14 is decompressed and flows back into the low-pressure cavity 14 along the first channel 20, the backflow cavity 19 and the second channel 23 in sequence (as shown by arrow in fig. 15), the water pump is protected, and water pump leakage caused by overpressure damage of relevant parts of the water pump is avoided; when the water pump works normally, the water pressure in the water outlet cavity 14 is smaller than a safety value, and the return valve core 21 of the return protection device is automatically closed under the action of the elastic force of the compression spring 22, so that fluid cannot flow back, and the use is safe and reliable; a fifth sealing ring 24 is arranged between the reflux cover 18 and the pump cover 3 to prevent water in the reflux cavity 19 from leaking.

According to the miniature electric diaphragm pump, the wobble plate support is made of die-casting aluminum alloy, the wobble plate bushing is made of POM, the POM has good self-lubricating property, and the service life of the diaphragm can be prolonged due to the contact between the diaphragm and the wobble plate bushing; the pump cover is firmly installed and is not easy to bend and deform, the central part of the pump cover is reinforced by the second bolt at the center, so that the pump cover is firmly installed and can firmly press a plurality of sealing parts such as sealing rings, diaphragms and the like, the sealing effect is ensured, and the problem of leakage is avoided; the first convex ribs play a role in reinforcing structural strength of the first mounting guide posts to a certain extent, so that the first mounting guide posts are not easy to deform; meanwhile, the side end of the first convex rib is abutted against the valve seat, so that the pump cover and the valve seat are stably installed; the diaphragm is provided with a sealing convex rib, the valve seat is provided with a groove, a second sealing bulge is formed in the groove, and the second sealing bulge is arranged at the side end of the sealing convex rib to laterally press the sealing convex rib, so that the sealing effect is improved; the wobble plate assembly is of a split type design, and is in contact with the diaphragm through the wobble plate bushing made of non-metal materials, so that the heat insulation effect is good, and the service life of the diaphragm is prolonged; the side end that the pump cover was kept away from the pump body is provided with a plurality of strengthening ribs, and the strengthening rib plays the effect of strengthening structural strength to the pump cover for the difficult bending deformation that takes place for the pump cover further avoids taking place to leak.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. A miniature electric diaphragm pump comprising: pump body (1), disk seat (2) and pump cover (3), disk seat (2) are arranged in pump body (1) with between pump cover (3), disk seat (2) with be provided with diaphragm (4) between pump body (1), pump body (1) are connected with motor (5), the off-centre of output shaft of motor (5) is provided with the wobble plate subassembly, wobble plate subassembly with diaphragm (4) are connected, motor (5) are including installing casing (501), pump body (1) are arranged in install casing (501) with between pump cover (3), pump cover (3) with install and fix through first bolt (7) between casing (501), first bolt (7) are provided with a plurality of and annular equidistant distribution, pump cover (3) with fix through second bolt (8) between pump body (1), a plurality of central point in the region that first bolt (7) are enclosed in second bolt (8).

2. A miniature electric diaphragm pump according to claim 1, characterized in that a first mounting guide post (301) for mounting the second bolt (8) is provided on the pump cover (3), a second mounting guide post (101) for mounting the second bolt (8) is provided on the pump body (1), and the first mounting guide post (301) abuts against a side end of the second mounting guide post (101).

3. A miniature electric diaphragm pump according to claim 2, characterized in that the outer wall of the first mounting post (301) is provided with a plurality of first ribs (302) in a ring shape, and the side ends of the first ribs (302) are abutted against the valve seat (2).

4. A miniature electric diaphragm pump according to claim 1, characterized in that a second rib (303) is annularly arranged on the pump cover (3), an annular groove (201) corresponding to the second rib (303) is arranged on the valve seat (2), a first sealing ring (304) is arranged in the annular groove (201), a first sealing protrusion (305) is formed at the side end of the second rib (303), and the first sealing protrusion (305) falls into the annular groove (201) to press the first sealing ring (304).

5. A miniature electric diaphragm pump according to claim 1, characterized in that a plurality of water inlet valve plates (202) and a plurality of water outlet valve plates (203) are mounted on the valve seat (2), and a plurality of limit guide posts (307) corresponding to the water outlet valve plates (203) are arranged on the pump cover (3).

6. A miniature electric diaphragm pump according to claim 1, characterized in that a sealing rib (401) is formed on one side of the diaphragm (4) close to the valve seat (2), a groove (204) corresponding to the sealing rib (401) is formed on the valve seat (2), a second sealing protrusion (205) is formed in the groove (204), and the second sealing protrusion (205) is disposed at a side end of the sealing rib (401).

7. A miniature electric diaphragm pump according to claim 1, characterized in that a second sealing ring (9) is arranged between the second bolt (8) and the pump cover (3), and a third sealing ring (10) and a fourth sealing ring (11) are arranged between the pump cover (3) and the valve seat (2).

8. A miniature electric diaphragm pump according to claim 1, characterized in that a third mounting guide post (306) for mounting the first bolt (7) is arranged on the pump cover (3), a plurality of reinforcing ribs (12) are arranged at the side end of the pump cover (3) far away from the pump body (1), and one end of each reinforcing rib (12) and the third mounting guide post (306) are integrally formed.

9. A miniature electric diaphragm pump according to any of claims 1-8, wherein the wobble plate assembly comprises a wobble plate bracket (61) and a wobble plate bushing (62), the wobble plate bracket (61) and the wobble plate bushing (62) are fixed by a third bolt (63), an arc-shaped mounting block (621) is arranged on the wobble plate bushing (62), a mounting groove (402) corresponding to the arc-shaped mounting block (621) is formed on the diaphragm (4), the wobble plate bracket (61) is made of metal, and the wobble plate bushing (62) is made of nonmetal.

10. A miniature electric diaphragm pump according to claim 9, wherein said wobble plate holder (61) is of die-cast aluminum alloy material and said wobble plate bushing (62) is of POM material.

11. A miniature electric diaphragm pump according to claim 1, characterized in that a diaphragm reinforcement rib (16) is arranged on one side of the diaphragm (4) close to the pump body (1), and a pump body groove (17) corresponding to the diaphragm reinforcement rib (16) is arranged on the pump body (1).

12. The miniature electric diaphragm pump according to claim 1, characterized in that a low-pressure water inlet cavity (13) and a high-pressure water outlet cavity (14) are formed in the pump cover (3), a backflow protection device is arranged on one side of the pump cover (3), the backflow protection device comprises a backflow cover (18) fixedly connected with the pump cover (3) and a backflow valve core (21), a backflow cavity (19) communicated with the water outlet cavity (14) is formed between the backflow cover (18) and the pump cover (3), a first channel (20) is communicated between the backflow cavity (19) and the water outlet cavity (14), a second channel (23) is communicated between the backflow cavity (19) and the water inlet cavity (13), a compression spring (22) is arranged between the backflow valve core (21) and the backflow cover (18), the backflow valve core (21) corresponds to the first channel (20), and the backflow valve core (21) is used for opening/sealing the first channel (20).