Diaphragm pump

Abstract

The utility model provides a diaphragm pump, which relates to the technical field of pumps and comprises a pump body, a liquid inlet valve, a liquid outlet valve, a diaphragm piece and a driving piece. The interior of the pump body is divided into a pump cavity and a liquid outlet cavity through a diaphragm seat with a liquid inlet hole and a liquid outlet hole, and the pump body is provided with a liquid inlet nozzle communicated with the liquid inlet hole and a liquid outlet nozzle communicated with the liquid outlet hole. The liquid inlet valve is movably arranged on the diaphragm seat; the liquid outlet valve is movably arranged on the diaphragm seat; the diaphragm piece is arranged in the pump body, and a pump cavity is defined by the diaphragm piece and the diaphragm base. The driving piece is in transmission connection with the diaphragm piece through the compression piece and used for driving the compression piece to reciprocate to compress or stretch the diaphragm piece; wherein the diaphragm piece is a leather cup diaphragm piece, and the movement direction of the diaphragm piece is perpendicular to the axis direction of the driving piece. Therefore, the compressor has the advantages of being large in compression ratio and convenient to place.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps, in particular to a diaphragm pump. Background Art

[0002] A diaphragm pump uses a drive mechanism to cause the diaphragm inside the pump body to reciprocate, compressing or stretching the air within the pump chamber (a fixed volume). A check valve, acting on the pump, creates positive pressure at the outlet and negative pressure at the inlet, creating a pressure differential with the ambient atmospheric pressure. This pressure differential forces liquid into the inlet and out the outlet. The kinetic energy transmitted by the drive mechanism continuously draws liquid in and out, resulting in a relatively stable flow rate.

[0003] In existing diaphragm pumps, the compression direction of the pump chamber and the output shaft of the driver are aligned. Consequently, increasing the pump's compression ratio and stroke would require significantly longer pumps, making them difficult to place and package. Furthermore, to minimize size, existing inlet and outlet valves are typically smaller, barely covering the inlet or outlet. However, small one-way valves are prone to sticking to debris and other sticky materials on the disc, potentially affecting the pump's operation.

[0004] Therefore, a diaphragm pump with a large compression ratio and easy placement needs to be designed. Utility Model Content

[0005] The purpose of the present invention is to provide a diaphragm pump to address the defects and shortcomings of the existing technology, and to solve at least one of the above technical problems. The diaphragm pump has the advantages of a large compression ratio and is easy to place.

[0006] To achieve the above-mentioned purpose, the present invention provides a device comprising:

[0007] The pump body has a diaphragm seat with a liquid inlet hole and a liquid outlet hole, which is used to separate the pump chamber and the liquid outlet chamber. The pump body is provided with a liquid inlet nozzle connected to the liquid inlet hole and a liquid outlet nozzle connected to the liquid outlet hole.

[0008] a liquid inlet valve, movably disposed on the diaphragm seat;

[0009] a liquid outlet valve, movably disposed on the diaphragm seat;

[0010] a diaphragm member, disposed in the pump body and enclosing the diaphragm seat to form the pump chamber;

[0011] a driving member, connected to the diaphragm member through a compression member, and configured to drive the compression member to reciprocate to compress or stretch the diaphragm member;

[0012] Wherein, the diaphragm is a leather cup diaphragm, and the movement direction of the diaphragm is perpendicular to the axial direction of the driving member.

[0013] Optionally, the driving member is connected to the connecting sleeve of the compression member through an eccentric wheel; the pressure rod of the compression member is assembled and connected to the diaphragm member, and the axis of the connecting sleeve is perpendicular to the axis of the pressure rod.

[0014] Optionally, the diaphragm seat has a pump groove with an elliptical cross-section on one side close to the diaphragm member, and the diaphragm member has a bowl cover with an elliptical cross-section matching the pump groove.

[0015] Optionally, the diaphragm seat is provided with a first step hole and a second step hole at intervals along the long axis direction of the pump groove, and the liquid inlet valve and the liquid outlet valve are both umbrella-shaped one-way valves; the umbrella rod of the liquid inlet valve is movably arranged in the first step hole and has an annular limiting boss that cooperates with the first step hole, and the valve disc of the liquid inlet valve is arranged on the side of the diaphragm seat close to the pump chamber, and can cover the liquid inlet hole and the second step hole.

[0016] Optionally, a first fan-shaped annular groove having the first step hole as the center and communicating with the liquid inlet hole is provided on a surface of the diaphragm seat close to the pump chamber.

[0017] Optionally, the umbrella rod of the liquid outlet valve can be movably configured in the second step hole and has an annular limiting boss that cooperates with the second step hole. The valve flap of the liquid outlet valve is configured on the side of the diaphragm seat away from the pump chamber and can cover the liquid outlet hole and the first step hole.

[0018] Optionally, a second fan-shaped annular groove with the second step hole as the center and connected to the liquid outlet is provided on a side of the diaphragm seat away from the pump chamber.

[0019] Optionally, the pump body also includes a lower shell, an upper shell and a side shell; the lower shell is fixed to one side of the diaphragm seat, and forms a accommodating chamber for the reciprocating movement of the eccentric wheel, the compression member and part of the diaphragm member; the diaphragm member is clamped between the lower shell and the diaphragm seat; the upper shell is fixed to the side of the diaphragm seat away from the lower shell, and is enclosed with the diaphragm member to form the liquid outlet chamber; the side shell is assembled on the side of the lower shell and the upper shell away from the driving member; the liquid inlet nozzle and the liquid outlet nozzle are arranged on the side of the side shell away from the driving member; the side shell has a first liquid inlet channel connecting the liquid inlet nozzle and the liquid inlet hole, and a liquid outlet channel connecting the liquid outlet nozzle and the liquid outlet chamber.

[0020] Optionally, a receiving groove is further arranged between the liquid outlet nozzle and the liquid outlet channel, and a stop valve is arranged in the receiving groove for closing or connecting the liquid outlet nozzle and the liquid outlet channel; the stop valve includes a plug, and an elastic member which is sleeved on the plug, one end of which abuts the inner wall of the receiving groove close to the liquid outlet nozzle and the other end of which abuts the plug.

[0021] Optionally, the side shell includes a bottom plate, a channel plate and a side cover; the bottom plate is arranged on the side of the lower shell and the upper shell away from the driving member, and has an assembly groove, the channel plate is arranged in the assembly groove, and cooperates with the bottom plate to form the first liquid inlet channel and the liquid outlet channel; the side cover is arranged on the side of the channel plate and the side cover away from the driving member, and has the accommodating groove.

[0022] Compared with the prior art, the advantages of this application are:

[0023] The diaphragm of this diaphragm pump is a cup-shaped diaphragm, and its movement direction is perpendicular to the axis of the driver. Due to its good elasticity and flexibility, the cup-shaped diaphragm has a high compression-expansion ratio. The reciprocating motion directions of the diaphragm and compression element of this diaphragm pump are not aligned with the axis of the driver. This increases the compression stroke of the diaphragm while avoiding an excessively long overall design of the diaphragm pump. This results in a high compression ratio and ease of placement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the structure decomposition of an embodiment of the utility model;

[0027] Figure 3 A top view of an embodiment of the present utility model;

[0028] Figure 4 for Figure 3 Sectional view along line AA;

[0029] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6This is a schematic diagram of an exploded view of a portion of the structure of an embodiment of the present utility model from one perspective;

[0031] Figure 7 This is a schematic diagram of an exploded view of a portion of the structure of an embodiment of the present utility model from another perspective;

[0032] Figure 8 This is a front view of the diaphragm seat according to an embodiment of the present utility model;

[0033] Figure 9 for Figure 8 Cross-section along line CC;

[0034] Figure 10 This is a schematic structural diagram of the upper shell of an embodiment of the utility model;

[0035] Figure 11 This is a schematic diagram of an exploded view of a partial structure of an embodiment of the present utility model from another perspective.

[0036] Description of Reference Numerals

[0037] 100-diaphragm pump;

[0038] 1- pump body; a- pump chamber; b- liquid outlet chamber; 11- lower shell; c- accommodating chamber; 111- concave-convex structure; 12- upper shell; d3- second liquid inlet channel; 13- side shell; d1- first liquid inlet channel; d2- liquid outlet channel; e- accommodating groove; 131- bottom plate; f- assembly groove; 132- channel plate; 133- side cover; 134- first sealing ring; 135- second sealing ring; 14- liquid inlet nozzle; 15- liquid outlet nozzle;

[0039] 2-diaphragm seat; o1-liquid inlet hole; o2-liquid outlet hole; g-pump groove; o3-first step hole; o4-second step hole; h1-first fan-shaped annular groove; h2-second fan-shaped annular groove;

[0040] 3-liquid inlet valve; 31-umbrella rod; 311-annular limiting boss; 312-first sealing annular boss; 32-valve disc;

[0041] 4-liquid outlet valve; 412-second sealing annular boss;

[0042] 5-diaphragm; 51-connecting portion; 52-bowl cover;

[0043] 6-compression member; 61-connecting sleeve; 62-pressure rod;

[0044] 7- eccentric wheel;

[0045] 8- driving member;

[0046] 9-stop valve; 91-plug. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," "back," "side," and "circumferential" used in the present invention to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limiting the present invention. In addition, terms such as first and second are used only to distinguish multiple components or structures having the same or similar structures and do not represent any special limitation on the arrangement order or connection relationship.

[0049] Please refer to Figures 1 to 11 The embodiment of the present utility model provides a diaphragm pump 100, including: a pump body 1, a liquid inlet valve 3, a liquid outlet valve 4, a diaphragm member 5 and a driving member 8.

[0050] The interior of the pump body 1 is divided into a pump chamber a and a discharge chamber b by a diaphragm seat 2 having a liquid inlet o1 and a liquid outlet o2. The pump body 1 is equipped with an inlet nozzle 14 connected to the liquid inlet o1 and an outlet nozzle 15 connected to the liquid outlet o2. Specifically, the liquid outlet o2 is connected to the outlet nozzle 15 through the liquid outlet chamber b. It is understood that the inlet nozzle 14 is not connected to the liquid outlet chamber b.

[0051] The liquid inlet valve 3 is movably arranged on the diaphragm seat 2, and is used to connect the pump chamber a with the liquid inlet nozzle 14 through the liquid inlet hole o1 when the pump chamber a is stretched, and to close the liquid inlet hole o1 and the pump chamber a when the pump chamber a is compressed.

[0052] The liquid outlet valve 4 is movably arranged on the diaphragm seat 2, and is used to connect the pump chamber a with the liquid outlet chamber b through the liquid outlet hole o2 when the pump chamber a is compressed, and to close the liquid outlet hole o2 and the liquid outlet chamber b when the pump chamber a is stretched.

[0053] The diaphragm 5 is disposed in the pump body 1 and encloses the diaphragm seat 2 to form a pump chamber a. The diaphragm 5 is a leather cup diaphragm 5. Since the leather cup diaphragm 5 has good elasticity and flexibility, it can have a high compression and expansion ratio.

[0054] The movement direction of the diaphragm 5 is perpendicular to the axis of the driver 8. Consequently, the reciprocating directions of the diaphragm 5 and the compression element 6 of the diaphragm pump 100 are not aligned with the axis of the driver 8. This increases the compression stroke of the diaphragm 5 while preventing the overall design of the diaphragm pump 100 from being excessively long. In other words, the total length of the pump body 1 is not equal to the sum of the compression length of the pump chamber a, the linear length of the compression element 6, and the driver 8. This provides a high compression ratio and facilitates placement.

[0055] In order to achieve the reciprocating motion of the compression member 6, optionally, please refer to Figure 2 and Figure 6 In this embodiment, the compression member 6 includes a connecting sleeve 61 and a pressure rod 62. The connecting sleeve 61 is connected to the pressure rod 62, and the axis of the connecting sleeve 61 is perpendicular to the axis of the pressure rod 62. The driving member 8 is connected to the connecting sleeve 61 of the compression member 6 through the eccentric wheel 7; the pressure rod 62 of the compression member 6 is assembled and connected to the diaphragm member 5. Optionally, in this embodiment, the driving member 8 is a driving motor. The driving motor rotates to drive the eccentric wheel 7 to rotate. The rotation of the eccentric wheel 7 drives the compression member 6 to reciprocately compress or stretch the diaphragm member 5, and the pump chamber a is compressed or expanded through the elastic deformation of the diaphragm member 5. Since the axis of the connecting sleeve 61 is perpendicular to the axis of the pressure rod 62, the direction of the reciprocating motion of the compression member 6 is perpendicular to the axis of the eccentric wheel 7, and the direction of movement of the diaphragm member 5 is perpendicular to the axis direction of the driving member 8.

[0056] Alternatively, see Figure 2 、 Figure 6 and Figure 8 In this embodiment, the diaphragm seat 2 has an elliptical pump groove g on the side near the diaphragm element 5. The diaphragm element 5 has an elliptical bowl cover 52 that matches the pump groove g. The end of the diaphragm element 5 away from the bowl cover 52 has a connecting portion 51 that connects to the compression rod 62; specifically, the connecting portion 51 of the diaphragm element 5 is clipped and fixed to the compression rod 62 of the compression element 6.

[0057] Alternatively, see Figure 2 、 Figure 4 、 Figure 6 and Figure 9In this embodiment, the diaphragm seat 2 has a first stepped hole o3 and a second stepped hole o4 extending through it. The first and second stepped holes o3 and o4 are spaced apart on the diaphragm seat 2 along the longitudinal axis of the pump groove g. Both the inlet valve 3 and the outlet valve 4 are umbrella-shaped one-way valves. The inlet valve 3 comprises an umbrella-shaped stem 31 and a valve disc 32. The stem 31 of the inlet valve 3 is movably disposed within the first stepped hole o3 and has an annular stopper 311 that engages with the first stepped hole o3. The valve disc 32 of the inlet valve 3 is disposed on the side of the diaphragm seat 2 near the pump chamber a and covers the inlet hole o1 and the second stepped hole o4. Thus, when the pump chamber a is stretched, liquid enters the inlet hole o1 from the inlet nozzle 14 and acts on the inner side of the valve disc 32 of the inlet valve 3. The inlet valve 3 moves toward the pump chamber a along the direction of the umbrella-shaped stem 31, thereby connecting the pump chamber a with the inlet nozzle 14 through the inlet hole o1, allowing liquid to flow from the inlet nozzle 14 into the pump chamber a. Due to the presence of an annular limiting boss 311 on the umbrella stem 31 of the inlet valve 3, it is retained within the first stepped hole o3 and prevented from disengaging from the diaphragm seat 2. When the pump chamber a contracts, the fluid in the pump chamber a compresses the valve disc 32 of the inlet valve 3 away from the side of the diaphragm seat 2, thereby resetting the inlet valve 3 and sealing the inlet hole o1, thereby blocking the inlet hole o1 from the pump chamber a. Since the inlet valve 3 covers both the inlet hole o1 and the second stepped hole o4 when closed, i.e., the area of ​​the valve disc 32 of the inlet valve 3 accounts for a significant proportion of the cross-sectional area of ​​the pump groove g, even if sticky debris adheres to the valve disc 32 of the one-way valve, it can be smoothly separated from the diaphragm seat 2, further enhancing the application scenarios and service life of the diaphragm pump 100. Furthermore, the end of the umbrella stem 31 of the inlet valve 3, near the valve disc 32, has a first sealing annular boss 312 that mates with the first stepped hole o3.

[0058] In order to make it easier for the valve flap 32 of the liquid inlet valve 3 to separate from the diaphragm seat 2 when the pump chamber a expands, optionally, please refer to Figure 6 and Figure 8 In this embodiment, a first sector-shaped annular groove h1, centered on the first stepped hole o3 and connected to the liquid inlet hole o1, is provided on the surface of the diaphragm seat 2 near the pump chamber a. As a result, when the pump chamber a expands, some liquid flowing in through the liquid inlet hole o1 can pass through the first sector-shaped annular groove h1 and impact the inner surface of the valve disc 32 of the liquid inlet valve 3, causing the valve disc 32 of the liquid inlet valve 3 to separate from the diaphragm seat 2.

[0059] It can be understood that the structure and principle of the liquid outlet valve 4 are similar to those of the liquid inlet valve 3. Figure 2 、 Figure 4 、 Figure 7 and Figure 9In this embodiment, the stem 31 of the liquid outlet valve 4 is movably positioned within the second stepped hole o4 and includes an annular stopper 311 that engages with the second stepped hole o4. The valve flap 32 of the liquid outlet valve 4 is positioned on the side of the diaphragm seat 2 away from the pump chamber a, covering both the liquid outlet hole o2 and the first stepped hole o3. Because the valve flap 32 of the inlet valve 3 and the valve flap 32 of the liquid outlet valve 4 are located on opposite sides of the diaphragm seat 2, even if the valve flaps 32 of the inlet valve 3 and the outlet valve 4 are both designed to be relatively large, no interference will occur. Thus, when the pump chamber a contracts, liquid flows from the pump chamber a through the liquid outlet hole o2 and acts on the inner side of the valve flap 32 of the liquid outlet valve 4. The liquid outlet valve 4 moves toward the liquid outlet chamber b along the stem 31, thereby connecting the pump chamber a and the liquid outlet chamber b through the liquid outlet hole o2. Liquid then flows from the pump chamber a back to the liquid outlet chamber b and out through the liquid outlet nozzle 15. When pump chamber a is stretched, the pressure in pump chamber a decreases, causing the liquid outlet valve 4 to reset. The valve flap 32 of the liquid outlet valve 4 covers the liquid outlet hole o2, thereby sealing the liquid outlet hole o2 from the liquid outlet chamber b. Furthermore, the end of the umbrella stem 31 of the liquid outlet valve 4, near the valve flap 32, has a second sealing annular boss 412 that mates with the second stepped hole o4.

[0060] In order to make it easier for the valve flap 32 of the liquid outlet valve 4 to separate from the diaphragm seat 2 when the pump chamber a contracts, optionally, please refer to Figure 7 In this embodiment, a second sector-shaped annular groove h2 is provided on a side of the diaphragm seat 2 away from the pump chamber a, with the second step hole o4 as the center and connected to the liquid outlet hole o2.

[0061] To facilitate the manufacture and assembly of the diaphragm pump 100, optionally, refer to Figure 2 、 Figure 4 、 Figure 10 and Figure 11In this embodiment, the pump body 1 also includes a lower shell 11, an upper shell 12 and a side shell 13. The lower shell 11 is fixed to one side of the diaphragm seat 2, and forms a receiving chamber c for the reciprocating movement of the eccentric wheel 7, the compression member 6 and part of the diaphragm member 5. The driving member 8 is fixed to one side of the lower shell 11, and its output shaft extends into the receiving chamber c, and the axial direction of the driving member 8 is perpendicular to the axial direction of the receiving chamber c. The diaphragm member 5 is clamped between the lower shell 11 and the diaphragm seat 2. Specifically, the outer edge of the bowl cover 52 of the diaphragm seat 2 is pressed and fixed between the lower shell 11 and the diaphragm seat 2 by the concave-convex structure 111. The upper shell 12 is fixed to the side of the diaphragm seat 2 away from the lower shell 11, and is enclosed by the diaphragm member 5 to form a liquid outlet chamber b. The side housing 13 is assembled to the side of the lower housing 11 and upper housing 12 away from the driver 8. The liquid inlet nozzle 14 and the liquid outlet nozzle 15 are located on the side of the side housing 13 away from the driver 8. The interior of the side housing 13 includes a first liquid inlet channel d1 connecting the liquid inlet nozzle 14 with the liquid inlet hole o1, and a liquid outlet channel d2 connecting the liquid outlet nozzle 15 with the liquid outlet cavity b. It is understood that the upper housing 12 also has a second liquid inlet channel d3, isolated from the liquid outlet cavity b. The liquid inlet nozzle 14 connects to the liquid inlet hole o1 via the first and second liquid inlet channels d1 and d3.

[0062] To prevent residual liquid in the outlet nozzle 15 from flowing back into the pump body 1 along the outlet channel d2 when the diaphragm pump 100 stops operating, causing the micropump to leak, a receiving groove e is provided between the outlet nozzle 15 and the outlet channel d2. A stop valve 9 is located within the receiving groove e, which serves to seal or connect the outlet nozzle 15 and the outlet channel d2. The stop valve 9 comprises a plug 91 and an elastic member (not shown) sleeved on the plug 91, one end of which abuts the inner wall of the receiving groove e near the outlet nozzle 15 and the other end of which abuts the plug 91. Specifically, the elastic member can be a compression spring.

[0063] Alternatively, see Figure 2 and Figure 11 In this embodiment, the side housing 13 includes a bottom plate 131, a channel plate 132, and a side cover 133. The bottom plate 131 is disposed on the side of the lower housing 11 and upper housing 12 away from the driver 8 and has a mounting groove f. The channel plate 132 is disposed in the mounting groove f and cooperates with the bottom plate 131 to form a first liquid inlet channel d1 and a liquid outlet channel d2. The side cover 133 is disposed on the side of the channel plate 132 and side cover 133 away from the driver 8 and has a receiving groove e. Specifically, the bottom plate 131, channel plate 132, and side cover 133 are assembled to the side of the lower housing 11 and upper housing 12 away from the driver 8 using threaded fasteners (not shown).

[0064] Furthermore, in order to increase the waterproof sealing performance of the diaphragm pump 100, in this embodiment, please refer to Figure 11A first sealing ring 134 for improving the waterproof performance between the liquid inlet nozzle 14 and the first liquid inlet channel d1 and a second sealing ring 135 for improving the waterproof performance between the liquid outlet nozzle 15 and the liquid outlet channel d2 are also arranged between the side cover 133 and the bottom plate 131 and the channel plate 132.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A diaphragm pump, characterized in that: include: A pump body (1) is internally divided into a pump chamber (a) and a liquid outlet chamber (b) by a diaphragm seat (2) having a liquid inlet hole (o1) and a liquid outlet hole (o2); the pump body (1) is provided with a liquid inlet nozzle (14) communicating with the liquid inlet hole (o1) and a liquid outlet nozzle (15) communicating with the liquid outlet hole (o2); a liquid inlet valve (3) movably disposed on the diaphragm seat (2); a liquid outlet valve (4), movably disposed on the diaphragm seat (2); A diaphragm member (5) is disposed in the pump body (1) and encloses the diaphragm seat (2) to form the pump chamber (a); A driving member (8) is connected to the diaphragm member (5) through a compression member (6) and is used to drive the compression member (6) to reciprocate to compress or stretch the diaphragm member (5); Wherein, the diaphragm member (5) is a leather cup diaphragm member (5), and the movement direction of the diaphragm member (5) is perpendicular to the axial direction of the driving member (8).

2. The diaphragm pump according to claim 1, wherein The driving member (8) is connected to the connecting sleeve (61) of the compression member (6) through the eccentric wheel (7); the pressure rod (62) of the compression member (6) is assembled and connected to the diaphragm member (5), and the axis of the connecting sleeve (61) is perpendicular to the axis of the pressure rod (62).

3. The diaphragm pump according to claim 1, wherein The diaphragm seat (2) has a pump groove (g) with an elliptical cross section on one side close to the diaphragm member (5), and the diaphragm member (5) has a bowl cover (52) with an elliptical cross section that matches the pump groove (g).

4. The diaphragm pump according to claim 3, wherein The diaphragm seat (2) is provided with a first step hole (o3) and a second step hole (o4) at intervals along the longitudinal direction of the pump groove (g); the liquid inlet valve (3) and the liquid outlet valve (4) are both umbrella-shaped one-way valves; the umbrella rod (31) of the liquid inlet valve (3) is movably arranged in the first step hole (o3) and has an annular limiting boss (311) that cooperates with the first step hole (o3); the valve flap (32) of the liquid inlet valve (3) is arranged on a side of the diaphragm seat (2) close to the pump chamber (a) and can cover the liquid inlet hole (o1) and the second step hole (o4).

5. The diaphragm pump according to claim 4, wherein A first fan-shaped annular groove (h1) with the first step hole (o3) as the center and connected to the liquid inlet hole (o1) is provided on one side of the diaphragm seat (2) close to the pump chamber (a).

6. The diaphragm pump according to claim 4, wherein The umbrella rod (31) of the liquid outlet valve (4) is movably arranged in the second step hole (o4) and has an annular limiting boss (311) that cooperates with the second step hole (o4). The valve flap (32) of the liquid outlet valve (4) is arranged on the side of the diaphragm seat (2) away from the pump chamber (a) and can cover the liquid outlet hole (o2) and the first step hole (o3).

7. The diaphragm pump according to claim 6, wherein A second fan-shaped annular groove (h2) with the second step hole (o4) as the center and connected to the liquid outlet hole (o2) is provided on a side of the diaphragm seat (2) away from the pump chamber (a).

8. The diaphragm pump according to claim 2, wherein: The pump body (1) further comprises a lower shell (11), an upper shell (12) and a side shell (13); the lower shell (11) is fixed to one side of the diaphragm seat (2) and is provided with an accommodating chamber (c) for the reciprocating motion of the eccentric wheel (7), the compression member (6) and part of the diaphragm member (5); the diaphragm member (5) is sandwiched between the lower shell (11) and the diaphragm seat (2); the upper shell (12) is fixed to the side of the diaphragm seat (2) away from the lower shell (11) and is in contact with the diaphragm member (5) ) enclosed to form the liquid outlet cavity (b); the side shell (13) is assembled on the side of the lower shell (11) and the upper shell (12) away from the driving member (8); the liquid inlet nozzle (14) and the liquid outlet nozzle (15) are arranged on the side of the side shell (13) away from the driving member (8); the side shell (13) has a first liquid inlet channel (d1) connecting the liquid inlet nozzle (14) and the liquid inlet hole (o1), and a liquid outlet channel (d2) connecting the liquid outlet nozzle (15) and the liquid outlet cavity (b).

9. The diaphragm pump according to claim 8, wherein A receiving groove (e) is further provided between the liquid outlet nozzle (15) and the liquid outlet channel (d2), and a stop valve (9) is provided in the receiving groove (e) for closing or connecting the liquid outlet nozzle (15) and the liquid outlet channel (d2); the stop valve (9) comprises a plug (91), and an elastic member which is sleeved on the plug (91), one end of which abuts against the inner wall of the receiving groove (e) on the side close to the liquid outlet nozzle (15), and the other end of which abuts against the plug (91).

10. The diaphragm pump according to claim 9, wherein The side shell (13) includes a bottom plate (131), a channel plate (132) and a side cover (133); the bottom plate (131) is arranged on a side of the lower shell (11) and the upper shell (12) away from the driving member (8), and has an assembly groove (f); the channel plate (132) is arranged in the assembly groove (f) and cooperates with the bottom plate (131) to form the first liquid inlet channel (d1) and the liquid outlet channel (d2); the side cover (133) is arranged on a side of the channel plate (132) and the side cover (133) away from the driving member (8), and has the accommodating groove (e).

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