CN217783730U

CN217783730U - Diaphragm piece, diaphragm piece subassembly and booster pump head and booster pump

Info

Publication number: CN217783730U
Application number: CN202221792513.7U
Authority: CN
Inventors: 蔡应麟; 徐兆火
Original assignee: Foshan City Sanjiaozhou Electrical Technology Co ltd
Current assignee: Foshan City Sanjiaozhou Electrical Technology Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-11-11
Anticipated expiration: 2032-07-11
Also published as: DE202022106243U1; NL2033407B1

Abstract

The utility model discloses a diaphragm, diaphragm subassembly and booster pump head and booster pump relates to the diaphragm booster pump field. One side of the diaphragm is provided with a plurality of convex structures extending along the axial direction, the end faces of the convex structures are provided with mounting holes, and the interior of each convex structure is provided with a first cavity communicated with the corresponding mounting hole; the opposite side that the diaphragm is relative sets up a plurality of projection, and every protruding structure sets up with a projection correspondence, is provided with the second cavity with first cavity intercommunication along the axial on the projection. Diaphragm subassembly, push away the head and inlay respectively in first cavity and second cavity through the piston with the piston pushes away the piece and establish, make the piston push away the piece and arrange the diaphragm in, and the piston pushes away the spliced pole of piece and is wrapped up by the projection completely, reduce the height of whole diaphragm subassembly, the pressure boost pump head is fixed in the balance from the projection that is located one side diaphragm of diaphragm through threaded connection's screw thread pole portion, make the dismouting of diaphragm more convenient, and can reduce the height of whole pressure boost pump head.

Description

Diaphragm piece, diaphragm piece subassembly and booster pump head and booster pump

Technical Field

The utility model relates to a diaphragm booster pump field, concretely relates to diaphragm, diaphragm subassembly and booster pump head and booster pump.

Background

At present, membrane booster pumps are commonly used in domestic and foreign osmotic water filters, for example, chinese patent publication No. CN213419314U discloses a booster pump head and a membrane pump using the same, which includes a pump head seat, a membrane sheet, a swinging wheel seat, a piston push sheet, a piston valve seat and a pump head cover that are sequentially arranged from bottom to top, the piston push sheet is embedded in the membrane sheet, the piston push sheet is further connected with a connecting convex column, the swinging wheel seat is provided with a plurality of swinging wheels, the swinging wheels are provided with connecting grooves for the connecting convex columns to be inserted, the swinging wheels are provided with threaded connectors in a penetrating manner, and the threaded connectors are fixedly connected with the connecting convex columns.

In the solutions disclosed in the prior patents, the connecting convex column is embedded in the diaphragm, and after the diaphragm is detected, the connecting convex column is connected with the balance wheel by passing through the balance wheel from one side of the balance wheel seat through a fixing screw, which has the following problems:

firstly, the diaphragm is inconvenient to disassemble, when the diaphragm needs to be disassembled, the balance wheel seat needs to be disassembled firstly, and then the threaded connecting piece can be unscrewed from one side of the balance wheel seat, so that the diaphragm can be disassembled;

and the connecting convex column can be connected with the balance wheel after extending out of the diaphragm for a certain length, so that the part of the connecting convex column extending out of the diaphragm is worn after long-time use, and the position where the end part of the connecting convex column is contacted with the diaphragm is loosened. Meanwhile, the installation mode can cause the length of the connecting convex column to be too long, so that the overall height after assembly is too large, and the installation environment in a small space cannot be met.

Therefore, there is a need for improved pump heads that are easy to manufacture and assemble.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses a first aim at provides a diaphragm, it is through setting up mounting hole and projection on the diaphragm, is convenient for follow-up pushing away the piston and installs in the diaphragm, and makes threaded connection spare pass the diaphragm from the one side that is equipped with the mounting hole, pushes away diaphragm, piston and balance seat installation together, reduces the overall dimension after the installation, also makes the dismouting of diaphragm more convenient simultaneously.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

a diaphragm is provided with a plurality of protruding structures extending along the axial direction on one side, mounting holes are formed in the end faces of the protruding structures, and a first cavity communicated with the mounting holes is formed in the protruding structures; the diaphragm is characterized in that the other side opposite to the diaphragm is provided with a plurality of convex columns, each convex structure is arranged corresponding to one convex column, and a second cavity communicated with the first cavity is axially arranged on each convex column.

Preferably, the inner diameter of the first cavity is larger than that of the second cavity, and the inner diameter of the first cavity is larger than that of the mounting hole.

Preferably, an annular clamping ring is arranged at the mounting hole, and the annular clamping ring extends axially towards the first cavity, so that a clamping gap is formed between the outer wall of the annular clamping ring and the inner wall of the first cavity.

Based on same utility model conceive, the utility model discloses a second aim at provides a diaphragm subassembly, pushes away the head and the spliced pole inlays respectively in first cavity and second cavity through the piston with the piston pushing away piece for the piston pushes away the piece and arranges the diaphragm in, and the spliced pole that the piston pushed away the piece is wrapped up by the projection completely, reduces the height of whole diaphragm subassembly.

a diaphragm assembly comprising:

a membrane sheet according to any one of the preceding claims;

the piston pushing piece is provided with a through groove extending along the axial direction, the upper end of the piston pushing piece is embedded in the first cavity of the protruding structure, and the other end of the piston pushing piece is embedded in the second cavity of the protruding column. Because the inner diameter of the first cavity is larger than that of the second cavity, and the inner diameter of the first cavity is larger than that of the mounting hole, the piston pushing piece can be stably clamped on the diaphragm

Preferably, the piston pushing piece comprises a piston pushing head and a connecting column connected with one side of the piston pushing head, the through groove penetrates through the piston pushing head and the connecting column, the piston pushing head is embedded in the first cavity, and the connecting column is embedded in the second cavity.

Set up like this, can push away the piece with the piston and arrange the diaphragm completely in for the spliced pole that the piston pushed away the piece is wrapped up by the projection completely, reduces the height of whole diaphragm subassembly, and can solve following problem: the connecting column of the piston pushing piece extends out of the convex column and is connected with the balance wheel seat, after the piston pushing piece is used for a long time, the part of the connecting column of the piston pushing piece extending out of the convex column is worn under the condition that the part of the connecting column of the piston pushing piece extending out of the convex column is subjected to transverse force applied by the end part of the convex column, and the contact position of the connecting column of the piston pushing piece and the end part of the convex column is loosened. And meanwhile, the connecting column is completely arranged in the second cavity, so that the length of the connecting column can be reduced.

Preferably, the piston pushing head and the connecting column are integrally formed.

Preferably, an annular convex ring is arranged on the end face of the piston pushing head and is arranged in the first cavity.

Preferably, the annular convex ring is used for being clamped between the outer wall of the annular clamping ring on the diaphragm and a clamping gap formed between the inner walls of the first cavity, so that the piston pushing head can be stably installed in the first cavity, and the stability of connection between the piston pushing piece and the diaphragm is further improved.

Preferably, a plurality of process grooves are formed in the annular convex ring, the process grooves are used for facilitating exhaust, and the connection strength can be further improved.

Based on same utility model conceive, the utility model discloses a third aim at provides a pressure boost pump head, in threaded rod portion through threaded connection spare is fixed in the balance from the projection that is located one side diaphragm of diaphragm for the dismouting of diaphragm is more convenient, and can reduce the height of whole pressure boost pump head.

the diaphragm assembly comprises a plurality of balance wheels, wherein the balance wheels are arranged on the balance wheel seat, insertion grooves for inserting and connecting convex columns on a diaphragm in the diaphragm assembly are formed in the balance wheels, and the threaded connecting piece penetrates through the through grooves to be fixedly connected with the balance wheels.

Preferably, the balance wheel is provided with a threaded connection hole at the bottom of the insertion groove, and the threaded rod part of the threaded connection piece penetrates through the through groove to be connected with the threaded connection hole, so that the diaphragm assembly is connected with the balance wheel seat.

Through the arrangement, the threaded rod part of the threaded connecting piece sequentially penetrates through the mounting hole, the penetrating groove and the threaded connecting hole from one side of the diaphragm, so that the threaded connecting piece is screwed in the threaded connecting hole, the convex column is fixed in the balance wheel, the mounting is convenient, the stress of the threaded connecting piece is good along the axis direction, the connection stability is favorably maintained, if the threaded connecting piece is connected with the connecting convex column in a lateral mode, the stress of the threaded connecting piece is not along the axis direction, and a shearing force which enables the threaded connecting piece to bend or even break along the axis direction of the threaded connecting piece can be generated.

Meanwhile, the threaded connecting piece penetrates through the piston pushing piece from one side of the diaphragm to be connected with the threaded connecting hole, so that the problem of inconvenience in disassembly and assembly caused by the fact that the threaded connecting piece is installed from the back side is solved.

Preferably, a protruding portion is arranged at the bottom of the inserting groove on the balance wheel, the threaded connecting hole extends from the end face of the protruding portion to the direction away from the inserting groove and the diaphragm, a spigot matched with the protruding portion is arranged at one end, facing the bottom of the inserting groove, of the protruding column of the diaphragm, the diameter of the spigot is larger than that of a through groove in the piston pushing piece, and the spigot and the protruding portion can be clamped and positioned by the arrangement, so that the coaxiality of the balance wheel and the piston pushing piece after assembly is guaranteed, the through groove and the threaded connecting hole can keep the coaxiality when the balance wheel and the threaded connecting hole are communicated, and connection and fixation of subsequent threaded connecting pieces are facilitated.

Preferably, a gasket is arranged on one side, facing the swinging wheel seat, of the diaphragm, an assembly hole for the convex column to pass through is formed in the gasket, and the gasket is tightly attached to one side, facing the swinging wheel seat, of the diaphragm.

The arrangement is such that the shim can play a role in preventing abrasion between the diaphragm and the pendulum wheel seat. Because the pendulum wheel seat can drive the diaphragm and move together long-time the in-process of rotating, and fatigue wear can appear in the face of the two contact after long-time the use, and then lead to appearing fatigue damage on the diaphragm, and the gasket can play fine abrasionproof between the two and decrease the effect, and the dismouting is changed conveniently.

Preferably, the convex column on the diaphragm is circular in cross section, so that the convex column is conveniently inserted into the inserting groove on the balance wheel seat,

preferably, the convex column on the diaphragm is non-circular in cross section. Specifically, the cross section of the convex column can be square, rectangular, oval or other shapes, so that the convex column can be effectively reduced from rotating around the center of the convex column in the installation process, and the convex column and the balance wheel can be conveniently fixed.

Based on same utility model conceive, the utility model discloses a fourth aim at provides a booster pump, including above-mentioned arbitrary pressure boost pump head, eccentric cam and driving motor, eccentric cam install in the pressure boost pump head, driving motor with eccentric cam connects and drives its rotation.

Compared with the prior art, the utility model discloses profitable technological effect has been obtained:

1. through set up mounting hole and projection on the diaphragm, be convenient for follow-up push away the piece with the piston and install in the diaphragm, and make threaded connection spare pass the diaphragm from the one side that is equipped with the mounting hole, push away piece and balance seat installation together with diaphragm, piston, reduce the whole size after the installation, and also make the dismouting of diaphragm more convenient.

2. The piston pushing head and the connecting column of the piston pushing piece are respectively embedded in the first cavity and the second cavity, so that the piston pushing piece is arranged in the diaphragm, the connecting column of the piston pushing piece is completely wrapped by the convex column, the height of the whole diaphragm component is reduced, and the problem of abrasion caused by the fact that the connecting column of the piston pushing piece extends out of the convex column and is connected with the balance wheel seat is solved.

3. The threaded rod part of the threaded connecting piece is fixed in the balance wheel from the convex column of the diaphragm positioned on one side of the diaphragm, so that the diaphragm is more convenient to assemble and disassemble, and the height of the whole booster pump head can be reduced.

4. The diaphragm is arranged on one side, facing the swing wheel seat, of the diaphragm, so that the gasket can play a role in preventing abrasion between the diaphragm and the swing wheel seat.

Drawings

FIG. 1 is a schematic view of the overall structure of a diaphragm according to embodiment 1 of the present invention;

FIG. 2 is another perspective view of a diaphragm according to embodiment 1 of the present invention;

FIG. 3 is a plan view of a membrane sheet according to embodiment 1 of the present invention;

FIG. 4 isbase:Sub>A cross-sectional view of the diaphragm of FIG. 3 taken along line A-A;

FIG. 5 is a structural view of a piston pusher in embodiment 2;

fig. 6 is a top view of the diaphragm assembly of example 2;

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;

FIG. 8 is a schematic view of the construction of a booster pump head according to embodiment 3;

FIG. 9 is an exploded view of the pump head of embodiment 3;

FIG. 10 is a schematic view showing the construction of a pendulum wheel base in embodiment 3;

fig. 11 is a structural view of the diaphragm assembly after being assembled with the balance holder in embodiment 3;

fig. 12 is a top view of the diaphragm assembly assembled with the balance holder in embodiment 3;

FIG. 13 is a cross-sectional view taken along line C-C of FIG. 12;

wherein, the technical characteristics that each reference number refers to are as follows:

1. a diaphragm sheet; 11. a raised structure; 111. mounting holes; 12. a convex column; 121. a second cavity; 13. a first cavity; 131. clamping gaps; 14. an annular snap ring; 2. a piston pusher; 21. a piston pusher; 211. a process groove; 22. connecting columns; 23. a through groove; 3. a swinging wheel seat; 31. a balance wheel; 311. a boss portion; 312. connecting a threaded hole; 313. inserting grooves; 4. a threaded connection; 41. a threaded shank portion; 5. a gasket; 6. a pump head base; 7. a piston valve seat; 8. a pump head cover; 9. a pump head base.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.

Examples

Example 1

Referring to fig. 1-5, a diaphragm 1 is provided, one side of the diaphragm 1 is provided with a plurality of protruding structures 11 extending in an axial direction, an end face of each protruding structure 11 is provided with a mounting hole 111, and a first cavity 13 communicating with the mounting hole 111 is arranged inside each protruding structure 11; the opposite side of the diaphragm 1 is provided with a plurality of protruding columns 12, each protruding structure 11 is arranged corresponding to one protruding column 12, each protruding structure 11 and the corresponding protruding column 12 have the same central axis, and a second cavity 121 communicated with the first cavity 13 is axially arranged on the protruding column 12. The number of the convex structures 11 and the convex columns 12 is one or more, and the present embodiment is provided with four convex structures and convex columns, so that the number of the convex structures 11 and the convex columns can be increased or decreased according to the actual use environment.

The inner diameter of the first cavity 13 is larger than that of the second cavity 121, and the inner diameter of the first cavity 13 is larger than that of the mounting hole 111. An annular clamping ring 14 is arranged at the position of the mounting hole 111, and the annular clamping ring 14 extends towards the direction of the first cavity 13 along the axial direction, so that a clamping gap 131 is formed between the outer wall of the annular clamping ring 14 and the inner wall of the first cavity 13. Through set up mounting hole 111 and projection 12 on diaphragm 1, be convenient for follow-up push away the piece 2 with the piston and install in diaphragm 1, and make threaded connection 4 pass diaphragm 1 from the one side that is equipped with mounting hole 111, with diaphragm 1, piston push away piece 2 and balance seat 3 installation together, reduce the whole size after the installation, and also make diaphragm 1's dismouting more convenient. And the clamping gap 131 can provide a clamping space for the piston pushing head 21 of the subsequent piston pushing piece 2.

Example 2

Referring to fig. 5-7, a diaphragm assembly, comprising: a diaphragm 1 and a piston pusher 2. The diaphragm 1 is the diaphragm 1 of the above embodiment; the number of the piston pushing piece 2 is the same as that of the convex structures 11 and the convex columns 12, the piston pushing piece 2 is provided with a through groove 23 extending along the axial direction, the upper end of the piston pushing piece 2 is embedded in the first cavity 13 of the convex structure 11, and the other end of the piston pushing piece 2 is embedded in the second cavity 121 of the convex column 12.

The piston pushing piece 2 comprises a piston pushing head 21 and a connecting column 22 connected with one side of the piston pushing head 21, the through groove 23 penetrates through the piston pushing head 21 and the connecting column 22, the piston pushing head 21 is embedded in the first cavity 13, and the connecting column 22 is embedded in the second cavity 121. Since the inner diameter of the first cavity 13 is larger than that of the second cavity 121, and the inner diameter of the first cavity 13 is larger than that of the mounting hole 111, the piston pusher 21 can be firmly clamped on the diaphragm 1. The piston push head 21 and the connecting column 22 of the piston push piece 2 are respectively embedded in the first cavity 13 and the second cavity 121, so that the piston push piece 2 is arranged in the diaphragm 1, and the connecting column 22 of the piston push piece 2 is completely wrapped by the convex column 12, and the height of the whole diaphragm assembly is reduced. And the problem that the connecting column 22 of the piston pushing piece 2 extends out of the convex column 12 and is connected with the balance wheel seat 3 can be solved, after the piston pushing piece is used for a long time, under the condition that the part of the connecting column 22 of the piston pushing piece 2, which extends out of the convex column 12, is subjected to transverse force applied by the end part of the convex column 12, the part of the connecting column 22, which extends out of the convex column 12, is abraded, and the contact position of the connecting column 22 of the piston pushing piece 2 and the end part of the convex column 12 is loosened. At the same time, placing the connecting column 22 completely in the second cavity 121 can reduce the length of the connecting column 22.

The piston pushing head 21 and the connecting column 22 are integrally formed. The end face of the piston push head 21 is provided with an annular convex ring, and the annular convex ring is arranged in the first cavity 13. The annular convex ring is used for being clamped between the outer wall of the annular clamping ring 14 on the diaphragm 1 and a clamping gap 131 formed between the inner walls of the first cavity 13, so that the piston pushing head 21 can be stably installed in the first cavity 13, and the stability of connection of the piston pushing piece 2 and the diaphragm 1 is further improved.

The annular convex ring is provided with a plurality of process grooves 211, and the process grooves 211 are used for facilitating exhaust and further improving the connection strength.

Example 3

Referring to fig. 8-13, a booster pump head sequentially includes, from bottom to top, a balance wheel base 3, a pump head base 6, a piston valve seat 7, and a pump head cover 8, and further includes a threaded connector 4 between the balance wheel base 3 and the piston valve seat 7, and a diaphragm assembly according to the above embodiment, the balance wheel base 3 is disposed on the pump head base 6, the balance wheel base 3 is provided with a plurality of balance wheels 31, the balance wheels 31 penetrate through holes on the pump head base 6 and are connected with diaphragm pieces on the diaphragm assembly, the pump head 31 is provided with an insertion groove 313 for insertion of a convex column 12 on the diaphragm piece 1 in the diaphragm assembly, the threaded connector 4 penetrates through the through groove 23 on the piston pusher 2 and is connected and fixed with the balance wheel 31, and a pump head base 9 is disposed on a side of the pump head base 6 away from the pump head cover, and the pump head base 9 is used for installing the balance wheel base 3 between the pump head base 6 and the pump head base 9.

The bottom of the balance 31 located in the insertion groove 313 is provided with a threaded connection hole 312, and the threaded rod portion 41 of the threaded connection piece 4 penetrates through the through groove 23 to be connected with the threaded connection hole 312, so that the diaphragm assembly is connected with the balance seat 3.

The bottom of the inserting groove 313 of the balance 31 is provided with a convex part 311, the threaded connecting hole 312 extends from the end surface of the convex part 311 in the direction away from the inserting groove 313 and the diaphragm 1, and meanwhile, one end of the convex column 12 of the diaphragm 1 facing the bottom of the inserting groove 313 is provided with a socket matched with the convex part 311, the diameter of the socket is larger than that of the through groove 23 on the piston pushing piece 2, so that the socket and the convex part 311 can be clamped and positioned, the coaxiality of the balance 31 and the piston pushing piece 2 after assembly is ensured, the through groove 23 and the threaded connecting hole 312 can keep the coaxiality when being communicated, and the subsequent threaded connecting piece 4 can be conveniently connected and fixed.

A gasket 5 is arranged on one side of the diaphragm 1 facing the swinging wheel seat 3, an assembly hole for the convex column 12 to pass through is formed in the gasket 5, and the gasket 5 is tightly attached to one side of the diaphragm 1 facing the swinging wheel seat 3. This arrangement makes it possible to protect the shim 5 from wear between the diaphragm 1 and the wobble plate carrier 3. Because the pendulum wheel seat 3 can drive diaphragm 1 and move together long-time rotation in-process, and the face of the two contact can appear fatigue wear after long-time the use, and then lead to appearing fatigue damage on the diaphragm 1, and gasket 5 can play fine abrasionproof decreases the effect between the two, and the dismouting is changed conveniently.

The convex column 12 on the diaphragm 1 is circular in cross section, so that the convex column 12 can be conveniently inserted into the insertion groove 313 on the swinging wheel seat 3. Or the convex column 12 on the diaphragm 1 is non-circular in cross section. Specifically, the cross section of the convex column 12 may be square, rectangular, oval or other shapes, so that the convex column 12 can be effectively prevented from rotating around its center during installation, and the convex column 12 and the balance wheel can be conveniently fixed.

The installation process of the booster pump head is as follows: when in connection, the piston push piece 2 is firstly embedded in the diaphragm 1, so that the mounting hole 111 on the diaphragm 1 is communicated with the hanging through hole of the piston push piece 2, then the convex column 12 on the diaphragm 1 is inserted in the inserting groove 313 of the balance wheel, so that the threaded connecting hole 312 on the balance wheel is communicated with the through groove 23, then the threaded rod part 41 of the threaded connecting piece 4 sequentially penetrates through the mounting hole 111, the through groove 23 and the threaded connecting hole 312 from one side of the diaphragm 1, so that the threaded connecting piece 4 is screwed in the threaded connecting hole 312, and the convex column 12 is fixed in the balance wheel.

Meanwhile, the threaded connecting piece 4 penetrates through the piston pushing piece 2 from one side of the diaphragm 1 to be connected with the threaded connecting hole 312, so that the threaded connecting piece 4 can be screwed and unscrewed from the front only by opening the piston valve seat 7 and the pump head cover 8 in the process of disassembling and assembling the booster pump head, the assembly of the diaphragm 1 and the balance wheel seat 3 is facilitated, and the problem of inconvenience in disassembly and assembly caused by the fact that the threaded connecting piece 4 is installed from the back is solved. And the threaded connector 4 is mounted from one side of the diaphragm 1, and the problem of poor sealing caused by the threaded connection hole 312 penetrating through the balance wheel seat 3 is avoided. Simultaneously threaded connection 4 is installed from one side of diaphragm 1, can also avoid piston to push away spliced pole 22 and inserting groove 313 grafting of piece 2, consequently need not to set up the piston of overlength and pushes away piece 2, just can accomplish diaphragm 1, piston pushes away the connection of piece 2 and balance wheel seat 3 through the length that increases threaded connection 4, thereby the whole height after having reduced diaphragm subassembly and balance wheel seat 3 assembly, make overall structure compacter and smallcler, the installation scope is wider.

Example 4

A booster pump comprises a booster pump head, an eccentric cam and a driving motor, wherein the eccentric cam is arranged in the booster pump head and is connected to the center of a balance wheel seat 3, the balance wheel seat 3 rotates along with the eccentric cam, and a balance wheel on the balance wheel seat 3 swings along the axis direction of the eccentric cam. The driving motor is connected with the eccentric cam and drives the eccentric cam to rotate. And the eccentric cam drives the pump head to perform the actions of water absorption and pressurization drainage.

Variations and modifications to the above-described embodiments may occur to those skilled in the art based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. In addition, although specific terms are used in the specification, the terms are used for convenience of description and do not limit the utility model in any way.

Claims

1. A diaphragm is characterized in that a plurality of bulge structures (11) extending axially are arranged on one side of the diaphragm (1), mounting holes (111) are formed in the end faces of the bulge structures (11), and a first cavity (13) communicated with the mounting holes (111) is formed in the bulge structures (11); the diaphragm is characterized in that a plurality of convex columns (12) are arranged on the other side, opposite to the diaphragm (1), of the diaphragm, each convex structure (11) is arranged corresponding to one convex column (12), and a second cavity (121) communicated with the first cavity (13) is axially arranged on each convex column (12).

2. Diaphragm according to claim 1, wherein the inner diameter of the first cavity (13) is larger than the inner diameter of the second cavity (121), and the inner diameter of the first cavity (13) is larger than the inner diameter of the mounting hole (111).

3. Diaphragm according to claim 1, wherein an annular snap ring (14) is provided at the mounting hole (111), the annular snap ring (14) being axially extending in a direction towards the first cavity (13) such that a snap gap (131) is formed between an outer wall of the annular snap ring (14) and an inner wall of the first cavity (13).

4. A diaphragm assembly, comprising:

a membrane sheet (1), said membrane sheet (1) being a membrane sheet (1) according to any of claims 1-3;

the piston pushing piece (2) is provided with a through groove (23) extending along the axial direction, the upper end of the piston pushing piece (2) is embedded in the first cavity (13) of the protruding structure (11), and the other end of the piston pushing piece (2) is embedded in the second cavity (121) of the convex column (12).

5. The diaphragm assembly according to claim 4, wherein the piston pusher (2) comprises a piston pusher (21) and a connecting post (22) connected to one side of the piston pusher (21), the through groove (23) is disposed through the piston pusher (21) and the connecting post (22), the piston pusher (21) is embedded in the first cavity (13), and the connecting post (22) is embedded in the second cavity (121).

6. Diaphragm assembly according to claim 5, wherein the end face of the piston pusher (21) is provided with an annular bead, which is placed in the first cavity (13).

7. The booster pump head comprises a balance wheel seat (3), a pump head seat (6), a piston valve seat (7) and a pump head cover (8), and is characterized by further comprising a threaded connector (4) and a diaphragm assembly, wherein the diaphragm assembly is the diaphragm assembly according to any one of claims 4 to 6, a plurality of balance wheels (31) are arranged on the balance wheel seat (3), insertion grooves (313) for inserting and connecting convex columns (12) on diaphragms (1) in the diaphragm assembly (1) are formed in the balance wheels (31), and the threaded connector (4) penetrates through the through grooves (23) to be fixedly connected with the balance wheels (31).

8. A booster pump head according to claim 7, wherein a threaded connection hole (312) is formed in the bottom of the insertion groove (313) of the balance (31), and the threaded rod portion (41) of the threaded connector (4) passes through the through groove (23) to connect with the threaded connection hole (312) so as to connect the diaphragm (1) assembly with the balance base (3).

9. A booster pump head according to claim 7, wherein a gasket (5) is provided on a side of the diaphragm (1) facing the wobble wheel base (3), the gasket (5) is provided with a fitting hole for the boss (12) to pass through, and the gasket (5) is tightly attached to a side of the diaphragm (1) facing the wobble wheel base (3).

10. A booster pump comprising a booster pump head according to any one of claims 7 to 9, an eccentric cam mounted in said booster pump head, and a drive motor connected to said eccentric cam and driving it in rotation.