WO2019019154A1

WO2019019154A1 - Diaphragm pump

Info

Publication number: WO2019019154A1
Application number: PCT/CN2017/094919
Authority: WO
Inventors: 王佳迪; 周乐
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2017-07-28
Filing date: 2017-07-28
Publication date: 2019-01-31
Also published as: CN108884822A; CN108884822B

Abstract

Disclosed is a diaphragm pump, comprising an electric motor (11), a diaphragm pump housing (12), and a transmission member (13), a metal diaphragm (14), a water inlet one-way valve (15) and a water outlet one-way valve (16) arranged in the diaphragm pump housing (12), wherein a drive shaft (17) of the electric motor (11) extends into the interior of the diaphragm pump housing (12) and is connected to the transmission member (13); the transmission member (13) is used to drive, under the drive of the electric motor (11), the metal diaphragm (14) to move in a reciprocating manner; the water inlet one-way valve (15) is in communication with an inner cavity of the diaphragm pump housing (12) for controlling liquid such that same flows into the diaphragm pump; and the water outlet one-way valve (16) is in communication with the inner cavity of the diaphragm pump housing (12) for controlling liquid so that same flows out of the diaphragm pump. By using the metal diaphragm (14) in the diaphragm pump, the service life of the diaphragm pump is prolonged, and the usage cost of the diaphragm pump is reduced.

Description

Diaphragm pump

Technical field

The invention relates to the technical field of diaphragm pumps, and in particular to a diaphragm pump using a metal diaphragm.

Background technique

The diaphragm pump, also known as the control pump, utilizes the elasticity of the diaphragm in the diaphragm pump to cause a change in volume through the reciprocating deformation of the diaphragm to suck the material out. Diaphragm pumps are widely used in agricultural drones, pesticide sprayers, and manual spraying devices. They are one of the main tools for agricultural disease prevention, insects, grass damage and liquid fertilizer application.

At present, the diaphragm of the diaphragm pump is usually made of rubber, silica gel or the like. However, when the separator of rubber, silica gel, etc. is used for a period of time, it is soaked by the pesticide, and the diaphragm often deforms and ruptures, which shortens the service life of the diaphragm pump.

Summary of the invention

The invention provides a diaphragm pump, which prolongs the service life of the diaphragm pump and reduces the use cost of the diaphragm pump.

The diaphragm pump provided by the present invention comprises: a motor, a diaphragm pump casing, and a transmission member, a metal diaphragm, a water inlet check valve and a water outlet check valve disposed in the diaphragm pump casing; the drive shaft of the motor extends The diaphragm pump housing is internally and connected to the transmission member;

The transmission member is configured to drive the metal diaphragm to reciprocate under the driving of the motor;

The water inlet check valve is in communication with the inner cavity of the diaphragm pump casing for controlling the flow of liquid into the diaphragm pump;

The outlet check valve is in communication with the inner chamber of the diaphragm pump housing for controlling the flow of the liquid out of the diaphragm pump.

In a possible embodiment, the metal separator has a convex surface, and the convex surface protrudes toward a side of the metal diaphragm;

Wherein, when the transmission member moves toward the metal diaphragm under the driving of the motor, the transmission member contacts the convex surface and presses the convex surface to elastically deform the metal diaphragm;

When the transmission member is driven away from the metal diaphragm by the motor, the transmission member comes out of contact with the convex surface to restore the metal diaphragm rebound to a shape when no elastic deformation occurs.

In a possible implementation, the metal diaphragm includes a central portion and a plurality of concentrically disposed circumferentially tapered portions, and the plurality of surrounding portions are disposed around the central portion;

Wherein, the central portion and the plurality of the surrounding portions are gradually protruded in order of size from large to small.

In a possible implementation manner, the central portion and the surrounding portion have a shape of a circle, an ellipse or a polygon.

In a possible embodiment, the connecting edges of the two adjacent surrounding portions have a hemming structure.

In a possible implementation manner, the metal diaphragm includes a plurality of sector-shaped metal sheets having the same radius; a plurality of the sector-shaped metal sheets are disposed around, and the convex surfaces are formed after being spliced.

In a possible embodiment, the connecting edges of the adjacent two sector-shaped metal sheets have a hemming structure.

In a possible implementation, the central area of the convex surface is convexly disposed and is planar.

In a possible embodiment, a protective layer is disposed on a side of the metal diaphragm opposite to the transmission member.

In a possible implementation manner, the protective layer comprises a silicone protective layer or a plastic protective layer.

In a possible embodiment, the protective layer is disposed at an edge of the metal separator.

In a possible embodiment, the metal separator is a plurality of;

The water inlet check valve and the water outlet check valve are both plural and the same amount, and each of the metal diaphragms corresponds to at least one of the water inlet check valves and at least one of the water outlet check valves.

In a possible implementation, the diaphragm pump casing is provided with a water inlet and a water outlet, and the water inlet is connected with a plurality of the water inlet check valves, the water outlet and a plurality of the water outlets The check valves are connected.

In a possible implementation, the transmission member includes a cam structure, a crank link structure, or a rack and pinion swing mechanism.

The diaphragm pump provided by the present invention uses a metal diaphragm instead of a diaphragm made of rubber or silica gel. Since the corrosion resistance of the metal diaphragm is superior to that of rubber and silica gel, the diaphragm is extended. The use of time, thereby extending the life of the diaphragm pump, reduces the cost of using the diaphragm pump.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic structural view of a diaphragm pump according to an embodiment of the present invention;

Figure 2 is a cross-sectional view of Figure 1 taken along the line AA;

3 is a schematic view showing the internal structure of a diaphragm pump according to an embodiment of the present invention;

4A is a top view of an implementation of a metal separator according to an embodiment of the present invention;

4B is a schematic structural view of FIG. 4A along the DD direction;

5A is a top view of another implementation manner of a metal separator according to an embodiment of the present invention;

FIG. 5B is a schematic structural view of FIG. 5A along the FF direction; FIG.

6 is a schematic structural view of an implementation manner of a transmission member according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another implementation manner of a transmission member according to an embodiment; FIG.

FIG. 8 is a schematic structural view of still another implementation manner of the transmission member according to the embodiment.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic structural view of a diaphragm pump according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1 taken along line AA, and FIG. 3 is a schematic diagram of an internal structure of a diaphragm pump according to an embodiment of the present invention. As shown in FIG. 1 to FIG. 3, the diaphragm pump provided in this embodiment may include: a motor 11, a diaphragm pump housing 12, and a transmission member 13 disposed in the diaphragm pump housing 12, a metal diaphragm 14, and a water inlet check valve. 15 and the water outlet check valve 16.

The drive shaft 17 of the electric motor 11 extends into the diaphragm pump housing 12 and is connected to the transmission member 13.

The transmission member 13 is configured to drive the metal diaphragm 14 to reciprocate under the driving of the motor 11.

The inlet check valve 15 is in communication with the interior of the diaphragm pump housing 12 for controlling the flow of liquid into the diaphragm pump.

A water outlet check valve 16 is in communication with the interior of the diaphragm pump housing 12 for controlling the flow of liquid out of the diaphragm pump.

The diaphragm pump provided in this embodiment is structurally provided with a motor 11 externally disposed on the diaphragm pump, and the motor 11 is fixedly coupled to the diaphragm pump casing 12, and the drive shaft 17 of the motor 11 extends into the interior of the diaphragm pump casing 12. This embodiment does not limit the fixing manner of the motor 11 and the diaphragm pump casing 12. An internal cavity is formed inside the diaphragm pump casing 12, and a transmission member 13, a metal diaphragm 14, a water inlet check valve 15, and a water discharge check valve 16 are disposed inside the diaphragm pump casing 12. The transmission member 13 is fixedly connected to the drive shaft 17 of the motor 11 extending into the diaphragm pump housing 12. The connection manner of the transmission member 13 and the drive shaft 17 is not limited in this embodiment, and the specific configuration of the transmission member 13 can be set according to the structure of the transmission member 13. Connection method. The transmission member 13 and the metal diaphragm 14 may be fixedly connected or may not be fixedly connected, as long as the transmission member 13 drives the metal diaphragm 14 to reciprocate under the driving of the motor 11. Among them, since the metal diaphragm 14 can reciprocate, the metal diaphragm 14 has a certain elasticity.

The diaphragm pump provided in this embodiment uses a metal diaphragm instead of a rubber or silica gel diaphragm. Since the corrosion resistance of the metal diaphragm is superior to that of the rubber or silicone material, the use time of the diaphragm is increased, thereby prolonging the service life of the diaphragm pump and reducing the use cost of the diaphragm pump.

The diaphragm pump provided in this embodiment works as follows:

After the motor 11 is energized, the drive member 13 is driven to move by the drive shaft 17. The transmission member 13 drives the metal diaphragm 14 to reciprocate. The metal diaphragm 14 applies pressure intermittently such that the volume of the diaphragm pump seals the working volume changes. When the volume becomes large, liquid such as water or pesticide flows into the inner cavity of the diaphragm pump through the inlet check valve 15. When the pressure is applied to the metal diaphragm 14 to cause the volume to become small, liquid such as water or pesticide flows out of the diaphragm pump through the outlet check valve 16, thereby realizing the complete flow of the pump water.

It should be noted that the number and position of the metal diaphragm 14, the inlet water check valve 15, and the water outlet check valve 16 are not particularly limited in this embodiment.

Alternatively, the metal diaphragm 14 may be plural. Both the inlet check valve 15 and the outlet check valve 16 are of the same number. Each metal diaphragm 14 corresponds to at least one water inlet check valve 15 and at least one water outlet check valve 16.

By providing a plurality of metal diaphragms and a water inlet check valve corresponding to the metal diaphragm and a water discharge one-way The valve enhances the efficiency and performance of the diaphragm pump.

Optionally, the diaphragm pump housing 12 may be provided with a water inlet (not shown) and a water outlet 18, the water inlet is in communication with the water inlet check valve 15, and the water outlet 18 is in communication with the water outlet check valve 16.

It should be noted that the number and position of the water inlet and the water outlet are not particularly limited in this embodiment.

Optionally, the diaphragm pump casing 12 may be provided with a water inlet port and a water outlet port 18, and the water inlet port communicates with the plurality of water inlet check valves 15, and the water outlet port 18 communicates with the plurality of water outlet check valves 16.

By providing a water inlet and a water outlet, the structure of the diaphragm pump casing can be simplified and the space of the diaphragm pump casing can be saved, so that the diaphragm pump has a simple and beautiful structure.

Optionally, the diaphragm pump housing 12 may be provided with a water inlet and a plurality of water outlets 18, and the water inlet is connected to the plurality of water inlet check valves 15, and each water outlet 18 is connected to at least one water outlet check valve 16. through.

By providing a water inlet and a plurality of water outlets, the structure of the diaphragm pump casing can be simplified, the water outlet port of the diaphragm pump is increased, the structure of the diaphragm pump is simplified, and the applicability of the diaphragm pump is improved.

It should be noted that the connection manner of the water inlet to the water inlet check valve 15 and the connection manner of the water outlet 18 and the water outlet check valve 16 are not particularly limited in this embodiment. For example, it may be connected by a control valve such as a two-way or a three-way according to the number of the water inlet check valve 15 or the water discharge check valve 16.

It should be noted that the shape and structure of the metal diaphragm 14 are not particularly limited in this embodiment. For example, the metal diaphragm 14 may be a circular metal foil, a square metal foil, or the like.

Alternatively, the metal diaphragm 14 may have a convex surface that protrudes toward one side of the metal diaphragm 14.

Here, when the transmission member 13 is moved toward the metal diaphragm 14 by the driving of the motor 11, the transmission member 13 comes into contact with the convex surface and presses the convex surface to elastically deform the metal diaphragm 14.

When the transmission member 13 is driven away from the metal diaphragm 14 by the motor 11, the transmission member 13 comes out of contact with the convex surface, so that the metal diaphragm 14 rebounds back to a shape in which no elastic deformation occurs.

Since the convex surface of the metal diaphragm protrudes toward one side, the metal diaphragm has strong elasticity. The transmission member and the metal diaphragm do not need to be fixedly connected, and the transmission member only needs to provide a pressing force to the metal diaphragm at intervals, and the reciprocation of the metal diaphragm is completed by the elasticity of the metal diaphragm itself. The connection relationship between the transmission member and the metal diaphragm is simplified, and the structure of the diaphragm pump is simpler.

Optionally, the central area of the convex surface is convexly disposed and is planar.

By setting the central area of the convex surface to a plane, when the transmission member moves toward the metal diaphragm, the transmission The contact between the piece and the central area of the convex surface is more tight, the contact area is increased, the pressing effect of the transmission member on the convex surface is improved, and the effect of the metal diaphragm to reciprocate by its own elasticity is enhanced.

Optionally, as an implementation manner, FIG. 4A is a top view of an implementation manner of a metal diaphragm according to an embodiment of the present invention, and FIG. 4B is a schematic structural view of FIG. 4A along a DD direction. As shown in FIGS. 4A-4B, the metal diaphragm 14 may include a central portion 21 and a plurality of concentrically disposed circumferentially tapered portions 22, the plurality of surrounding portions 22 being disposed around the central portion 21.

Wherein, the central portion 21 and the plurality of surrounding portions 22 are connected and gradually protruded in order of size from large to small.

It should be noted that the central portion 21 and the plurality of surrounding portions 22 may be integrally formed, or may be an independent structure, and connected by a bonding method such as adhesion or pressure bonding.

It should be noted that the shape of the center portion 21 and the plurality of surrounding portions 22 in the present embodiment is not particularly limited, and may be provided as needed. Alternatively, the shape of the central portion 21 and the surrounding portion 22 may be circular, elliptical or polygonal.

Optionally, the connecting edges connecting the two adjacent surrounding portions 22 have a hemming structure 23 .

Optionally, the connecting edge of the central portion 21 connected to the smallest surrounding portion 22 has a hemming structure 23 .

The elasticity of the metal diaphragm is further increased by providing the hemming structure.

In this implementation, the central region of the convex surface may be the central portion 21, and the central portion 21 is disposed as a flat surface.

Alternatively, as another implementation manner, FIG. 5A is a top view of another implementation manner of the metal diaphragm provided by the embodiment of the present invention, and FIG. 5B is a schematic structural view of FIG. 5A along the FF direction. As shown in FIGS. 5A to 5B, the metal diaphragm 14 may include a plurality of sector-shaped metal sheets 31 having the same radius.

A plurality of sector-shaped metal sheets 31 are disposed around and spliced to form a convex surface.

It should be noted that the plurality of sector-shaped metal pieces 31 having the same radius may be integrally formed, or may be an independent structure, and connected by a bonding method such as adhesion or pressure bonding.

Optionally, the connecting edges of the adjacent two sector-shaped metal pieces 31 have a folded edge structure 32.

The elasticity of the metal diaphragm is further increased by providing the hemming structure 32.

Optionally, a plurality of sector-shaped metal pieces 31 are disposed in a plane around a central region 33 of the convex surface formed by splicing. The central region 33 may be formed by splicing a plurality of sector-shaped metal sheets 31, or may be a separate component, and is disposed at a central position of the convex surface formed by splicing of the plurality of sector-shaped metal sheets 31. The present embodiment is not particularly limited to this.

It should be noted that, in this embodiment, the implementation manner of the transmission member 13 is not particularly limited, and any existing structure that can drive the reciprocating motion of the metal diaphragm under the driving of the motor can be used.

Optionally, FIG. 6 is a schematic structural diagram of an implementation manner of the transmission component provided by the embodiment. As shown in FIG. 6, the transmission member may include a cam structure, and the cam structure may include a cam 41 on which the cam 41 may be sleeved.

Specifically, the cam is a member having a curved profile and is the simplest mechanism for moving according to a predetermined rule. In the present embodiment, the cam 41 is sleeved on the drive shaft 17 of the motor, and the drive shaft 17 can drive the cam 41 to rotate. When the convex end of the cam 41 moves toward the metal diaphragm, the convex end comes into contact with the convex surface of the metal diaphragm and presses the convex surface to elastically deform the metal diaphragm. When the convex end of the cam 41 is away from the metal diaphragm, the convex end comes out of contact with the convex surface of the metal diaphragm to return the metal diaphragm rebound to a shape in which no elastic deformation occurs.

It should be noted that the implementation of the cam structure and the cam 41 in this embodiment is not particularly limited, and is set as needed.

Alternatively, the cam structure may also include a follower. The embodiment does not limit the implementation of the follower, and the follower structure in any of the existing cam structures, such as a push rod, may be employed. The stroke of the push rod is determined by the difference in the radius of the cam. The change in the speed of the push rod is determined by the contour curve and speed of the cam. At this time, the drive shaft 17 of the motor drives the cam 41 to rotate, the cam 41 drives the follower to move, and the follower presses the metal diaphragm according to a preset rule. When there are a plurality of metal diaphragms, there may be a plurality of followers connected to the cam.

Optionally, FIG. 7 is a schematic structural diagram of another implementation manner of the transmission component provided by the embodiment. As shown in FIG. 7, the transmission member may include a crank link structure 43 that is coupled to the drive shaft 17 and the metal diaphragm 14, respectively.

Specifically, the crank link structure is a planar link mechanism that can realize mutual conversion between rotation and movement, and generally includes a crank member that performs rotation and a link member that moves. The rotational motion of the crank member can be converted into a reciprocating motion of the link member, or the reciprocating motion of the link member can be converted into a rotational motion of the crank member. In the present embodiment, the crank link structure 43 is coupled to the drive shaft 17 of the motor and the metal diaphragm 14, respectively. The drive shaft 17 can drive the crank member to rotate, and the crank member can drive the link member to reciprocate. Further, the link member can drive the metal diaphragm 14 to reciprocate. When there are a plurality of metal diaphragms 14, the number of link members in the crank link structure 43 may be plural.

It should be noted that the implementation manner of the crank link structure 43 in this embodiment is not particularly limited, and any implementation of the existing crank link structure may be adopted, as long as the crank link structure can drive the metal diaphragm to reciprocate. can.

It should be noted that the connection manner of the crank link structure 43 and the drive shaft 17 and the metal diaphragm 14 is not limited in this embodiment. For example, the crank link structure 43 can be welded, bonded, or the like to the metal diaphragm 14.

Optionally, FIG. 8 is a schematic structural diagram of still another implementation manner of the transmission component provided by the embodiment. As shown in FIG. 8, the transmission member may include a rack and pinion swinging mechanism 45, and the rack and pinion swinging mechanism 45 may include a gear 46 and a rack 47, and the gear 46 is coupled to the drive shaft 17. The drive shaft 17 is used to drive the gear 46 to rotate, and the gear 46 is used to drive the rack 47 to reciprocate.

Specifically, the rack and pinion swing mechanism is also referred to as a rack and pinion mechanism, a rack and pinion mechanism, and the like, and generally includes a gear and a rack, which can convert the rotary motion of the gear into a reciprocating linear motion of the rack, or the rack The reciprocating linear motion is converted into the rotary motion of the gear. In the present embodiment, the gear 46 is coupled to the drive shaft 17 of the motor. The drive shaft 17 can drive the gear 46 to rotate, and the gear 46 can drive the rack 47 to reciprocate. In turn, the gear 46 can drive the metal diaphragm to reciprocate. When there are a plurality of metal diaphragms, there may be a plurality of racks in the rack and pinion swing mechanism.

It should be noted that the implementation manner of the rack and pinion swinging mechanism 45 in this embodiment is not particularly limited, and any of the existing rack and pinion swinging mechanisms may be used, as long as the rack and pinion swinging mechanism can drive the metal diaphragm to reciprocate. can.

It should be noted that the connection manner of the rack-and-pinion swinging mechanism 45 and the drive shaft 17 and the metal diaphragm is not limited in this embodiment. For example, the rack 47 may or may not be fixedly connected to the metal diaphragm.

Further, a side of the metal diaphragm opposite to the transmission member may be provided with a protective layer.

By providing a protective layer, the corrosion resistance and sealing properties of the metal separator can be further improved.

Optionally, the protective layer may include a silicone protective layer or a plastic protective layer.

Alternatively, the protective layer can be placed on the edge of the metal diaphragm.

The embodiment provides a diaphragm pump including a motor, a diaphragm pump housing, and a transmission member, a metal diaphragm, a water inlet check valve, and a water outlet check valve disposed in the diaphragm pump housing. The drive shaft of the motor extends into the diaphragm pump housing and is connected to the transmission. The transmission member is used to drive the metal diaphragm to reciprocate under the driving of the motor. The inlet check valve communicates with the inner chamber of the diaphragm pump housing for controlling the flow of liquid into the diaphragm Pump. The outlet check valve is in communication with the interior of the diaphragm pump housing for controlling the flow of liquid out of the diaphragm pump. The diaphragm pump provided by the embodiment improves the corrosion resistance of the diaphragm by using the metal diaphragm, prolongs the service life of the diaphragm pump, and reduces the use cost of the diaphragm pump.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only used to explain the technical solutions of the embodiments of the present invention, and are not limited thereto; although the embodiments of the present invention are described in detail with reference to the foregoing embodiments, those skilled in the art It should be understood that the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the essence of the corresponding technical solutions. The scope of the technical solution.

Claims

A diaphragm pump, comprising: a motor, a diaphragm pump housing, and a transmission member disposed in the diaphragm pump housing, a metal diaphragm, a water inlet check valve, and a water outlet check valve; a drive shaft of the motor Extending into the interior of the diaphragm pump housing and connected to the transmission member;

The transmission member is configured to drive the metal diaphragm to reciprocate under the driving of the motor;

The water inlet check valve is in communication with the inner cavity of the diaphragm pump casing for controlling the flow of liquid into the diaphragm pump;

The outlet check valve is in communication with the inner chamber of the diaphragm pump housing for controlling the flow of the liquid out of the diaphragm pump.
The diaphragm pump according to claim 1, wherein the metal diaphragm has a convex surface, and the convex surface protrudes toward a side of the metal diaphragm;

Wherein, when the transmission member moves toward the metal diaphragm under the driving of the motor, the transmission member contacts the convex surface and presses the convex surface to elastically deform the metal diaphragm;

When the transmission member is driven away from the metal diaphragm by the motor, the transmission member comes out of contact with the convex surface to restore the metal diaphragm rebound to a shape when no elastic deformation occurs.
The diaphragm pump according to claim 2, wherein the metal diaphragm comprises a central portion and a plurality of concentrically disposed circumferentially tapered portions, and the plurality of surrounding portions are disposed around the central portion;

Wherein, the central portion and the plurality of the surrounding portions are gradually protruded in order of size from large to small.
The diaphragm pump according to claim 3, wherein the central portion and the surrounding portion have a circular shape, an elliptical shape or a polygonal shape.
The diaphragm pump according to claim 3, wherein the connecting edges of the adjacent two surrounding portions have a hemming structure.
The diaphragm pump according to claim 2, wherein said metal diaphragm comprises a plurality of sector-shaped metal sheets of the same radius;

A plurality of the sector-shaped metal pieces are disposed around, and the convex surfaces are formed after splicing.
The diaphragm pump according to claim 6, wherein the connecting edges of the adjacent two sector-shaped metal pieces have a hemming structure.
A diaphragm pump according to any one of claims 2 to 7, wherein a central portion of the convex surface is convexly disposed and planar.
The diaphragm pump according to any one of claims 1 to 8, wherein a protective layer is provided on a side of the metal diaphragm opposite to the transmission member.
The diaphragm pump according to claim 9, wherein the protective layer comprises a silicone protective layer or a plastic protective layer.
A diaphragm pump according to claim 9, wherein said protective layer is provided at an edge of said metal diaphragm.
The diaphragm pump according to any one of claims 1 to 11, wherein the plurality of metal diaphragms are plural;

The water inlet check valve and the water outlet check valve are both plural and the same amount, and each of the metal diaphragms corresponds to at least one of the water inlet check valves and at least one of the water outlet check valves.
The diaphragm pump according to claim 12, wherein the diaphragm pump casing is provided with a water inlet and a water outlet, and the water inlet is connected to a plurality of the inlet check valves, and the water outlet is A plurality of the outlet water check valves are in communication.
The diaphragm pump according to any one of claims 1 to 13, wherein the transmission member comprises a cam structure, a crank link structure or a rack and pinion swing mechanism.