Diaphragm assembly and diaphragm pump

Abstract

The invention provides a diaphragm assembly and a diaphragm pump, the diaphragm assembly comprises a piston push block, a diaphragm piece, a middle piece, a balance wheel seat and a fastener, the diaphragm piece comprises a diaphragm piece body and a boss arranged on the diaphragm piece body, and the boss protrudes towards the middle piece and extends into the balance wheel seat; the piston push block comprises a plug head and a plug rod arranged on the side, close to the diaphragm piece, of the plug head, the plug head is located on the side, away from the middle piece, of the diaphragm piece, the plug rod extends in the direction of the diaphragm piece, and the plug rod is embedded in the corresponding boss; the middle piece is provided with a first through hole, the balance wheel seat comprises a balance wheel, and the balance wheel is provided with an insertion hole for the corresponding boss to be inserted; and the fastening piece fixes the piston push block, the diaphragm piece and the balance wheel seat from one side deviating from the working surface of the diaphragm piece.

Description

Technical Field

[0001] The present application relates to the field of diaphragm pumps, and in particular to a diaphragm assembly and a diaphragm pump comprising the diaphragm assembly. Background Art

[0002] The diaphragm is one of the core components of the diaphragm booster pump. The motor of the diaphragm booster pump drives the eccentric cam to rotate, so as to drive the balance wheel seat and the balance wheel on it to swing up and down. The diaphragm is elastically deformed with the swing of the balance wheel, so that the volume of the booster chamber at the working surface of the diaphragm changes. The volume change of the diaphragm assembly is used to complete the process of water absorption and drainage.

[0003] In the related art, the diaphragm sheet of the diaphragm assembly and its related structure have the problem of poor sealing performance. Summary of the invention

[0004] An object of the present application is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0005] In response to the above problems, the present application discloses a diaphragm assembly, including a piston push block, a diaphragm, an intermediate piece, a balance wheel seat, and a fastener, wherein the diaphragm includes a diaphragm body and a boss arranged on the diaphragm body, the boss protrudes in the direction toward the intermediate piece and extends into the balance wheel seat; the piston push block includes a plug and a plug rod arranged on the side of the plug close to the diaphragm, the plug is located on the side of the diaphragm away from the intermediate piece, the plug rod extends in the direction of the diaphragm, and the plug rod is embedded in the corresponding boss; the intermediate piece is provided with a first through hole, the balance wheel seat includes a balance wheel, and the balance wheel is provided with a plug hole for the corresponding boss to be plugged in; and the fastener fixes the piston push block, the diaphragm and the balance wheel seat from the side away from the working surface of the diaphragm.

[0006] According to an exemplary embodiment of the present application, a second through hole is provided at the end of the boss, a first threaded hole is provided inside the plug rod, and the fastener is configured to pass through the second through hole and connect with the first threaded hole.

[0007] According to an exemplary embodiment of the present application, the plug head is provided with a first annular convex strip arranged around the plug rod on a side close to the diaphragm. The first annular convex strip can prevent liquid from entering the boss from the radial direction of the plug rod, thereby improving the sealing effect.

[0008] According to an exemplary embodiment of the present application, a second annular convex strip is provided on the outer side of the plug rod, which can prevent liquid from entering the non-working area from the axial direction of the plug rod, further improving the sealing effect.

[0009] According to an exemplary embodiment of the present application, the outer diameters of the plug rod and the boss gradually decrease along the extension direction thereof. The rod and the boss are designed to be conical in the axial direction, and can form a conical surface with the plug hole. Under the constraint of the axial force, the drum surface will gradually press the diaphragm to achieve sealing.

[0010] According to an exemplary embodiment of the present application, the boss is a non-porous structure, the balance wheel seat also includes a second threaded hole, the fastener includes a claw-type structure and a screw, the claw-type structure is configured to pass through the plug hole and clamp the boss, and the screw is configured to compress the claw-type structure toward the center when being screwed into the second threaded hole. The non-porous setting of the diaphragm completely isolates the diaphragm chamber and the motor at the non-working surface to avoid liquid leakage. In addition, since the diaphragm itself has no gaps, it can automatically suck in the medium in the absence of the medium, so that the diaphragm pump can run dry for a short period of time.

[0011] According to an exemplary embodiment of the present application, the plug rod and the boss are shaped in an extending direction such that the middle portion is small and the ends are large.

[0012] According to an exemplary embodiment of the present application, a convex portion is provided on the surface of the plug head on one side close to the diaphragm, and a concave portion is provided on the surface of the diaphragm body. The convex portion cooperates with the concave portion and is configured to block the rotation of the piston push block.

[0013] According to an exemplary embodiment of the present application, two grooves are provided on the surface of the plug head, and the two grooves are configured to clamp the piston push block.

[0014] According to an exemplary embodiment of the present application, a gasket is provided between the intermediate piece and the balance wheel seat, and a third through hole is provided on the gasket for the boss to be inserted.

[0015] According to an exemplary embodiment of the present application, the cross-section of the boss is a non-circular cross-section.

[0016] According to an exemplary embodiment of the present application, the diaphragm body includes a disc, and the boss is located at a position on the disc that is offset from the center and close to the edge. The eccentric setting and the cooperation of the piston valve body can increase the flow area of ​​the liquid.

[0017] According to an exemplary embodiment of the present application, the thickness of the portion of the diaphragm sheet contacting the edge of the first through hole is greater than the thickness of the remaining portion of the diaphragm sheet. The increased thickness of the diaphragm sheet at the contact portion can offset the influence of contact friction to increase the life of the diaphragm sheet.

[0018] According to an exemplary embodiment of the present application, the edge of the first through hole of the middle piece is provided with a step, and the diaphragm assembly further comprises a gasket, which is provided on the step and is made of a polytetrafluoroethylene material. The gasket acts as a lubricant between the diaphragm and the middle piece to increase the life of the diaphragm.

[0019] According to an exemplary embodiment of the present application, the diaphragm body and the boss are integrally formed, and the diaphragm is made of an elastic material.

[0020] According to an exemplary embodiment of the present application, the piston push block is made of nylon and glass fiber materials.

[0021] The present application also discloses a diaphragm pump, comprising a pump head cover, a piston valve body, an eccentric cam, a motor and a diaphragm assembly as described in the present application, wherein the eccentric cam is installed in the diaphragm assembly, and the motor is connected to the eccentric cam and drives the eccentric cam to rotate.

[0022] In the aforementioned exemplary embodiments of the present application, compared with the prior art, a piston push block is provided on the working surface of the diaphragm, and the plug head of the piston push block is close to the diaphragm body, while the plug rod of the piston push block is sleeved in the boss of the diaphragm. The fastener is inserted from the right side of the plug hole of the balance wheel seat, and fixes the piston push block, the diaphragm, and the balance wheel seat. The fastener is located on the non-working surface of the diaphragm, so it does not need to contact with the liquid, and there is no risk of rust or corrosion of the screws. In this way, liquid can be prevented from leaking into the non-working area of ​​the diaphragm, thereby improving the safety and life of the diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features, advantages and other aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Several embodiments of the present application are shown in an exemplary and non-limiting manner. In the accompanying drawings:

[0024] Figure 1 It is a three-dimensional exploded view of a diaphragm pump 1 according to an embodiment of the present application;

[0025] Figure 2 It is a perspective exploded view of a diaphragm assembly 30 according to an embodiment of the present application;

[0026] Figure 3a This is a front view of a diaphragm assembly 30 after assembly according to an embodiment of the present application;

[0027] Figure 3b This is a three-dimensional diagram of a diaphragm assembly 30 after being assembled according to an embodiment of the present application;

[0028] Figure 4a for Figure 3aA cross-sectional view of the diaphragm assembly 30 along the AA direction;

[0029] Figure 4b for Figure 4a A cross-sectional view of the piston push block in FIG.

[0030] Figure 4c for Figure 4a A three-dimensional diagram of the piston push block in FIG.

[0031] Figure 4d A three-dimensional diagram of a piston push block in one embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a middle piece and a gasket according to an embodiment of the present application;

[0033] Figure 6 It is a perspective exploded view of a diaphragm assembly 50 according to an embodiment of the present application;

[0034] Figure 7 This is a three-dimensional exploded view of a piston push block and a diaphragm sheet in a diaphragm assembly 50 according to an embodiment of the present application;

[0035] Figure 8a This is a front view of a diaphragm assembly 50 after assembly according to an embodiment of the present application;

[0036] Figure 8b This is a three-dimensional diagram of a diaphragm assembly 50 after being assembled according to an embodiment of the present application;

[0037] Figure 9a for Figure 8a A cross-sectional view of the diaphragm assembly 50 along the BB direction;

[0038] Figure 9b for Figure 8a A partial cross-sectional view of the diaphragm assembly 50 along the CC direction. DETAILED DESCRIPTION

[0039] The technical solution of the present application is further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the implementation methods of the present application with reference to the accompanying drawings is intended to explain the overall inventive concept of the present application and should not be construed as a limitation on the present application.

[0040] The terms "including", "comprising" and similar terms used herein should be understood as open terms, i.e., "including / including but not limited to", indicating that other contents may also be included. The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment", and so on.

[0041] Figure 1 , a three-dimensional exploded view of a diaphragm pump 1 in an embodiment of the present application is shown. The diaphragm pump 1 includes a pump head cover 10, a piston valve body 20, a diaphragm assembly 30 and a base 40. A fluid inlet and a fluid outlet are provided on the pump head cover 10. The piston valve body 20 is also called a water outlet pressure plate. The diaphragm assembly 30 is arranged on the base 40. The piston valve body 20 and the diaphragm sheet on the outside of the diaphragm assembly 30 form a working area of ​​the diaphragm sheet, and the side where the working area is located is the working surface of the diaphragm sheet. A motor is provided in the base 40. The diaphragm pump 1 drives the pendulum in the diaphragm assembly 30 to swing by the rotation of the motor, which causes the diaphragm sheet in the diaphragm assembly 30 to undergo elastic deformation, so that the volume of the boosting chamber changes, thereby achieving a boosting function.

[0042] The structure or assembly method of each component in the diaphragm assembly will affect the sealing of the diaphragm and the service life of the diaphragm pump. The applicant has found that sealing can be achieved by using screws to pass through the diaphragm from the working surface of the diaphragm to connect it to the balance wheel seat. However, since the screws are in direct contact with the liquid, there is a risk of rust or corrosion during long-term use, resulting in a gap between the screws and the diaphragm, causing liquid to leak into the non-working area of ​​the diaphragm, and ultimately causing the diaphragm pump to fail.

[0043] In order to solve the above problems, according to an overall concept of the present application, a diaphragm assembly and a diaphragm pump are provided, wherein the diaphragm assembly includes a piston push block, a diaphragm, an intermediate piece, a balance wheel seat, and a fastener, wherein the diaphragm includes a diaphragm body and a boss arranged on the diaphragm body, the boss protrudes toward the middle piece and extends into the balance wheel seat; the piston push block includes a plug and a plug rod arranged on the side of the plug close to the diaphragm, the plug is located on the side of the diaphragm away from the middle piece, the plug rod extends toward the diaphragm, and the plug rod is embedded in the corresponding boss; the middle piece is provided with one or more first through holes, the balance wheel seat includes a balance wheel, and the balance wheel is provided with a plug hole for plugging the corresponding boss; and the fastener is configured to fix the piston push block, the diaphragm and the balance wheel seat from the side away from the working surface of the diaphragm.

[0044] Figure 2 FIG. 2 shows a perspective exploded view of a diaphragm assembly 30 according to an embodiment of the present application. Figure 2 As shown, the diaphragm assembly 30 includes three piston push blocks 31 , a diaphragm sheet 32 ​​, a middle piece 33 , a balance wheel seat 34 and three fasteners 35 in the direction from the pump head to the pump tail, that is, from left to right in the figure.

[0045] Each piston push block 31 includes a plug head 311 and a plug rod 312. The plug head 311 is located on the side of the diaphragm 32 away from the middle piece 33, that is, the left side of the diaphragm 32 in the figure. The plug rod 312 is on the side of the plug head 311 close to the diaphragm 32. The plug rod 312 extends from the plug head 311 toward the diaphragm 32. Figure 2 The middle plug 311 is in a disc shape. In some other examples, the plug 311 may also be in other suitable shapes, such as square, rectangular, oval, etc.

[0046] The diaphragm 32 includes a diaphragm body 321 and three bosses 322 . Figure 2 In the example, the diaphragm body 321 includes three disks, and its shape is roughly a triangle formed by three disks arranged as three vertices, and there are three diaphragm chambers in the working area.

[0047] Three bosses 322 are provided on the diaphragm body 321. Each boss is located in its own disc, and protrudes toward the direction of the middle piece 33 and extends into the balance wheel of the balance wheel seat 34. The size of the boss 322 is adapted to the size of the plug rod 312. Each plug rod 312 is embedded in the corresponding boss 322. In some examples, the inner dimension of each boss 322 (such as the inner diameter, for example, 8 mm) may be slightly smaller than the outer dimension of the plug rod 312 (such as the outer diameter) to provide an interference fit. The position of the boss 322 may be located at a position where the disc deviates from the center and is close to the edge, that is, the position of the boss is eccentric to the outer edge in the disc. This arrangement and the cooperation with the piston valve body can increase the flow area of ​​the liquid.

[0048] The diaphragm body 321 and the boss 322 can be integrally formed. In some examples, the diaphragm 32 can be made of a rubber material, or other materials with appropriate elasticity, such as polyurethane. The rubber material here can be ordinary rubber or special rubber, such as fluororubber. The material of the diaphragm can adapt to the requirements of different media in the pump (such as corrosive pesticides) to provide a safe and stable operating environment. The material of the piston push block can be different from the material of the diaphragm. The piston push block can be made of a composite reinforced material, such as a composite material of nylon and glass fiber, to increase its impact strength.

[0049] The middle piece 33 is a support for the diaphragm assembly 30. The middle piece 33 is provided with three equally spaced through holes 331 (first through holes). The balance wheel seat 34 is provided with three balance wheels 341. The surrounding walls of the middle piece 33 and the diaphragm sheet 32 ​​form a swing chamber for the balance wheel to swing. The balance wheel 341 is provided with a plug-in hole 342 for the boss 322 of the diaphragm sheet to be plugged in. The fastener 35 passes through the plug-in hole 342 in the direction toward the pump head to fix the piston push block 31 and the diaphragm sheet 32 ​​to the balance wheel 341.

[0050] The middle piece is evenly provided with fixing holes 332 around its periphery. These fixing holes 332 can cooperate with fixing holes (not shown) on the pump head cover 10 to fix the pump head cover 10 and the diaphragm assembly 30 together.

[0051] exist Figure 2 In the embodiment, a piston push block is provided on the working surface of the diaphragm 32, and the plug of the piston push block is close to the diaphragm body, while the plug rod of the piston push block is embedded in the boss of the diaphragm. The fastener is inserted from the right side of the plug hole of the balance wheel seat, and the piston push block, the diaphragm and the balance wheel seat are fixed. The fastener is located on the non-working surface of the diaphragm, so it does not need to contact with the liquid, and there is no risk of rust or corrosion of the screws. In this way, liquid can be prevented from leaking into the non-working area of ​​the diaphragm (such as the motor part), thereby improving the safety and life of the diaphragm pump.

[0052] The numbers of the piston push block 31, the disc on the diaphragm 32, the through hole 331 on the middle piece 33, the balance wheel 341 on the balance wheel seat 34, and the fasteners 35 in the diaphragm assembly 30 are correspondingly consistent. It can be understood that in some other examples, according to actual application requirements, the number of the disc on the diaphragm body can be other numbers, such as 1, 4, 5 or 6, and the corresponding number of the piston push block, the through hole on the middle piece, the balance wheel on the balance wheel seat, and the fasteners can be 1, 4, 5 or 6.

[0053] In some examples, a plurality of spacers 36 may be provided between the middle member 33 and the balance wheel seat 34. Figure 2 An example is provided for explaining the above. The gasket 36 is provided with an assembly hole 361 (third through hole) for the boss 322 to pass through. The gasket 36 is closely attached to the side of the diaphragm 32 facing the balance wheel seat 34. The gasket can be made of metal material, such as stainless steel. The balance wheel seat 34 will drive the diaphragm 32 to move together during long-term rotation, and the contact surface of the two will experience fatigue wear after long-term use, which will lead to fatigue damage on the diaphragm 32. The gasket 36 between the middle piece 33 and the balance wheel seat 34 can play an anti-wear role.

[0054] In some examples, an eccentric cam 37 may be provided in the diaphragm assembly 30 . Figure 3a A front view of the diaphragm assembly 30 after being assembled is shown, which shows the front side of the diaphragm assembly 30 . Figure 3b FIG. 2 shows a perspective view of the diaphragm assembly 30 after being assembled, which shows the back side of the diaphragm assembly 30 .

[0055] The installation process of the diaphragm assembly 30 can be as follows: install the balance wheel seat 34 on the middle piece 33, extend the balance wheel 341 into the swing chamber of the middle piece and then fix it; align each boss 322 on the diaphragm sheet 32 ​​with the plug hole 342 of the balance wheel 341, and fit the diaphragm sheet 32 ​​tightly with the balance wheel 341; after aligning each piston push block 31 with the boss 322, push the plug head 311 to make the plug rod 312 enter the boss 322; insert each fastener 35 into the corresponding plug hole 342 of the balance wheel, and finally fix the piston push block, diaphragm sheet, and balance wheel seat.

[0056] In some examples, the applicant found that the plug of the piston push block is set inside the diaphragm, but the piston push block and the diaphragm are made of different materials, which makes it difficult to manufacture and assemble, and it is easy to slide during use, so that the internal connection of the diaphragm assembly is unstable and even fails. In the present application, the diaphragm assembly 30 is made of a separately set piston push block and diaphragm, and the manufacturing and assembly process is very simple. In addition, the plug rod is embedded in the inside of the boss, the position between the piston push block and the diaphragm is easier to fix, and the structure is more stable and reliable.

[0057] Figure 4a Shows Figure 3a A cross-sectional view of the diaphragm assembly 30 along the AA direction. Figure 4b Shows Figure 4a A cross-sectional view of the piston push block in FIG. Figure 4c Shows Figure 4a A three-dimensional view of the piston push block in the Figure 4a In the embodiment, the end of the boss 322 of the diaphragm is provided with a through hole 323 (second through hole). The interior of the plug rod 312 of the piston push block is provided with a threaded hole 313 (first threaded hole). The fastener 35 passes through the through hole 323 and is connected to the internal threaded hole 313 of the plug rod 312. In the assembly of the diaphragm assembly 30, the fastener 35 first enters the balance wheel through the plug hole in the balance wheel, and then connects to the internal threaded hole 313 of the plug rod 312 through the through hole 323. Figure 4a In the embodiment, the shoulder of the fastener 35 abuts against the bottom surface of the balance wheel 341, which can improve the connection strength.

[0058] exist Figure 4a In the embodiment, the plug rod 312 and the boss 322, and the boss 322 and the plug hole 342 can all be interference fit. Specifically, the inside of the plug hole 342, the inside and outside of the boss 322, and the outside of the plug rod 312 can be straight-cylindrical. In addition, the outer diameter of the boss is slightly larger than the inner diameter of the plug hole 342, and the inner diameter of the boss is slightly smaller than the outer diameter of the plug rod. In some examples, the boss 322 and the plug rod 312 can be non-straight-cylindrical. For example, Figure 4b-Figure 4c, the outer diameter of the plug rod gradually decreases along its extension direction. In addition, the outer diameter of the boss can also gradually decrease along its extension direction. The plug rod and the boss are designed to be conical in the axial direction, and can form a conical surface with the plug hole. Under the constraint of the axial force, the drum surface will gradually press the diaphragm to achieve sealing. In addition, the length of the plug rod 312 and the length of the boss 322 can be equal or close, for example, both are 12 mm.

[0059] according to Figure 4a-4c The shoulder of the piston push block 31, that is, the plug head 311, is provided with an annular convex strip 314 (first annular convex strip) on the side close to the diaphragm 32, and the annular convex strip 314 is arranged around the plug rod 312. When the piston push block 31 is pushed into the boss 322, the annular convex strip 314 is embedded in the diaphragm body 321. The annular convex strip 314 can prevent liquid from entering the boss 322 from the radial direction of the plug rod 312, thereby improving the sealing effect.

[0060] In addition, two protrusions 315 are provided on the back side of the piston push block 31, that is, on the side of the plug head 311 close to the diaphragm 32. Correspondingly, two recesses 324 are provided on the surface (working surface) of the diaphragm body 321. The two protrusions 315 and the two recesses 324 are used in conjunction with each other. When the piston push block 31 is pushed into the boss 322, the protrusion 315 can be aligned with the recess 324 and pressed into it. The protrusion 315 and the recess 324 can be used to block the rotation of the piston push block 31. It can be understood that the number of protrusions or recesses is not limited to the case of 2 in the figure, and can be specifically set according to actual conditions.

[0061] In addition, two grooves 316 are provided on the front side of the piston push block 31, that is, the plug 311 is away from the diaphragm 32. When the piston push block 31 needs to be pushed into the diaphragm 32, the grooves 316 can be clamped by an external clamp to facilitate the assembly of the pump.

[0062] Figure 4d FIG. 1 shows a three-dimensional view of a piston push block in one embodiment of the present application. Figure 4c compared to, Figure 4d The outer side of the plug rod of the piston push block is provided with an annular convex strip 317 (second annular convex strip). The annular convex strip 317 can prevent the liquid from entering the non-working area from the axial direction of the plug rod 312, further improving the sealing effect.

[0063] In addition, the boss 322 on the diaphragm 32 has a circular cross section, which is convenient for the boss 322 to be inserted into the insertion hole 331 on the balance wheel seat 33. In some examples, the boss 322 on the diaphragm 32 has a non-circular cross section. Specifically, the cross section of the boss 322 can be square, rectangular, elliptical or other shapes, which can effectively reduce the rotation of the boss 322 around its own center during the installation process, and facilitate the fixing of the boss 322 to the balance wheel.

[0064] When the diaphragm is in working condition, the contact friction between the diaphragm and the middle piece will affect the life of the diaphragm. Figure 4a The thickness of the contact portion between the diaphragm body 321 and the through hole of the middle piece 33 (i.e., the black circular dotted line frame) can be greater than the thickness of the rest of the diaphragm. The thickened thickness of the diaphragm at the contact portion can offset the influence of contact friction to increase the life of the diaphragm.

[0065] Figure 5 A schematic diagram of the structure of an intermediate piece and a gasket of an embodiment of the present application is shown. The left side of the intermediate piece 33, that is, the edge of the first through hole, may be provided with a step. The diaphragm assembly may further include a gasket 333. The gasket 333 is located between the diaphragm and the intermediate piece 33. The structure of the gasket 333 is compatible with the diaphragm 32 and the intermediate piece 33. For example, the gasket 333 is a structure composed of three circular rings, which may be placed on the stepped hole on the surface of the intermediate piece 33, and the gasket 333 may also be in contact with the bottom of the three discs of the diaphragm 32. The gasket 333 may be made of polytetrafluoroethylene material, which may play a lubricating role between the diaphragm and the intermediate piece, thereby increasing the life of the diaphragm.

[0066] Figure 6 A perspective exploded schematic diagram of a diaphragm assembly 50 according to an embodiment of the present application is shown. Figure 7 FIG. 5 shows a three-dimensional exploded schematic diagram of the piston push block and the diaphragm sheet in the diaphragm assembly 50. Figure 6 As shown, the diaphragm assembly 50 includes three piston push blocks 51, a diaphragm sheet 52, an intermediate piece 53, a balance wheel seat 54 and three fasteners 55 from the pump head to the pump tail, that is, from left to right in the figure. The diaphragm assembly 50 can also be equipped with an eccentric cam 57.

[0067] Compared with the diaphragm assembly 30, the difference between the diaphragm assembly 50 lies in the structure of the fastener 55 and the fixing method between the piston push block 51, the middle piece 53, the balance wheel seat 54 and the fastener 55, which will be described in detail below. The parts of the diaphragm assembly 50 similar to those of the diaphragm assembly 30 are briefly described or not repeated.

[0068] Each piston push block 51 includes a plug head 511 and a plug rod 512. The plug head 511 is located on the side of the diaphragm 52 away from the middle piece 55, that is, the left side of the diaphragm 52 in the figure. The plug rod 512 is on the side of the plug head 511 close to the diaphragm 52. The plug rod 512 extends from the plug head 511 toward the diaphragm 52. The diaphragm 52 includes a diaphragm body 521 and three bosses 522. In the diaphragm assembly 50, the diaphragm body 521 includes three discs, which are roughly shaped like a triangle with three discs arranged as three vertices, so there are 3 diaphragm chambers in the working area.

[0069] The diaphragm body 521 is provided with three bosses 522. Each boss is located in its own disc, and protrudes toward the direction of the middle piece 53 and extends into the balance wheel of the balance wheel seat 54. The size of the boss 522 is adapted to the size of the plug rod 512. Each plug rod 512 is embedded in the corresponding boss 522. The diaphragm body 521 and the boss 522 can be integrally formed. It is worth noting that both the plug rod 512 and the boss 522 are non-porous structures.

[0070] The middle piece 53 is a support for the diaphragm assembly 50. The middle piece 53 is provided with three equally spaced through holes 531 (first through holes). The middle piece is evenly provided with fixing holes 532 around it. These fixing holes 532 can cooperate with the fixing holes (not shown) on the pump head cover 10 to fix the pump head cover 10 and the diaphragm assembly 50.

[0071] The balance wheel seat 54 is provided with three balance wheels 541. The surrounding walls of the intermediate member 53 and the diaphragm 52 form a swinging chamber for the balance wheel to swing. The balance wheel 541 is provided with a plugging hole 542 for the boss 522 of the diaphragm to plug in. In addition, two threaded holes 543 (second threaded holes) are also provided around the plugging hole 542.

[0072] The fastener includes a claw structure 551 and a screw 552. The claw structure 551 includes a circle of sheet structures, which can pass through the plug hole 542 and be inserted between the boss and the plug hole. When the screw 552 around the claw structure 551 is screwed into the threaded hole 543, the screw compresses the sheet structure of the claw structure toward its center, thereby pinching the boss. The fastener 55 fixes the piston push block 51 and the diaphragm sheet 52 to the balance wheel 541 through the plug hole 542 in the direction toward the pump head.

[0073] exist Figure 6-7 In the embodiment, a piston push block is provided on the working surface of the diaphragm 52, and the plug of the piston push block is close to the diaphragm body, while the plug rod of the piston push block is sleeved in the boss of the diaphragm. The fastener is inserted from the right side of the plug hole of the balance wheel seat, and the piston push block, the diaphragm and the balance wheel seat are fixed. The fastener is located on the non-working surface of the diaphragm, so it does not need to contact with the liquid, there is no risk of rust or corrosion of the screws, and it can prevent the liquid from leaking into the non-working area of ​​the diaphragm, thereby improving the safety and life of the diaphragm pump.

[0074] In some examples, the piston push block 51 may also be provided with a convex portion (not shown) on the side close to the diaphragm 52. Correspondingly, a concave portion may be provided on the working surface of the diaphragm body 521. In addition, a groove may also be provided on the front of the piston push block 51 for clamping by an external clamp. In some examples, three gaskets may be provided between the middle piece 53 and the balance wheel seat 54, and each gasket is provided with a through hole for the boss on the diaphragm to be inserted to play a role in wear prevention.

[0075] Figure 8a A front view of the diaphragm assembly 50 after assembly is shown, showing the front side of the diaphragm assembly. Figure 8b A perspective view of the diaphragm assembly 50 after being assembled is shown, which shows the back side of the diaphragm assembly 50. Figure 9a Shows Figure 8a A cross-sectional view of the diaphragm assembly 50 along the BB direction. Figure 9b Shows Figure 8a A partial cross-sectional view of the diaphragm assembly 50 along the CC direction.

[0076] The balance wheel 54 can be made of plastic and has a certain elasticity. Figure 9a-9b When the screw 552 is screwed into the threaded hole 543, the surroundings of the threaded hole 543 are squeezed outward, thereby applying pressure to the adjacent claw-shaped structure 551. The claw-shaped structure 551 applies pressure from the surroundings of the end of the boss 522 to the center of the boss, thereby fixing the boss and the plug rod 512 therein. In addition, the outside of the plug rod 512 and the inside of the boss 522 are shaped in a small middle part and a large end part in their respective extension directions. This makes it easier for the claw-shaped structure to grab it.

[0077] The fastener 55 in the diaphragm assembly 50 includes two screws. It is understood that in order to improve the fixing force, the fastener can also include a larger number of screws. For example, the fastener includes four screws, which are distributed around the claw structure.

[0078] Since the diaphragm assembly 50 does not have a hole in the diaphragm, the diaphragm chamber at the working surface of the diaphragm and the part at the non-working surface are completely isolated, thereby preventing liquid leakage and having better sealing performance. In addition, since the diaphragm itself has no gaps, the diaphragm pump can automatically suck in the medium in the absence of the medium, without the need for an additional suction device or pre-filling. Therefore, the diaphragm pump can also be run dry for a short period of time.

[0079] The installation process of the diaphragm assembly 50 can be as follows: the balance wheel seat 54 is installed on the middle piece 53, and the balance wheel 541 is inserted into the swing chamber of the middle piece and then fixed; each boss 522 on the diaphragm sheet 52 is aligned with the plug hole 542 of the balance wheel 541, and the diaphragm sheet 52 is tightly fitted with the balance wheel 541; after each piston push block 51 is aligned with the boss 522, the plug head 511 is pushed to make the plug rod 512 enter the boss 522; each screw 552 is inserted into the corresponding threaded hole 543 of the balance wheel, the claw-type structure 551 is squeezed, and finally the piston push block, the diaphragm sheet, and the balance wheel seat are fixed.

[0080] The diaphragm assembly of the present application can be applied to a diaphragm pump. The present application also discloses a diaphragm pump. Figure 1The diaphragm pump is described. The diaphragm pump of the present application comprises a pump head cover 10, a piston valve body 20, an eccentric cam 37, a motor located in a base 40, and any of the diaphragm assemblies described above. The eccentric cam 37 is installed in the diaphragm assembly, and the motor is connected to the eccentric cam and drives the eccentric cam to rotate.

[0081] The above is only an optional embodiment of the embodiment of the present application, and is not intended to limit the embodiment of the present application. For those skilled in the art, the embodiment of the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present application shall be included in the protection of the embodiment of the present application.

[0082] Although the embodiments of the present application have been described with reference to several specific embodiments, it should be understood that the embodiments of the present application are not limited to the disclosed specific embodiments. The embodiments of the present application are intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims. The scope of the appended claims conforms to the broadest interpretation, thereby including all such modifications and equivalent structures and functions.

Claims

1. A diaphragm assembly, characterized in that: It includes a piston push block, a diaphragm, an intermediate piece, a balance wheel seat, and fasteners, among which: The diaphragm comprises a diaphragm body and a boss disposed on the diaphragm body, wherein the boss protrudes toward the middle piece and extends into the balance wheel seat; The piston push block comprises a plug head and a plug rod arranged on a side of the plug head close to the diaphragm, the plug head is located on a side of the diaphragm away from the middle piece, the plug rod extends toward the diaphragm, and the plug rod is embedded in the corresponding boss; The middle piece is provided with a first through hole, the balance wheel seat comprises a balance wheel, and the balance wheel is provided with an insertion hole for the corresponding boss to be inserted into; and The fastener fixes the piston push block, the diaphragm and the balance wheel seat from the side away from the working surface of the diaphragm.

2. The diaphragm assembly according to claim 1, characterized in that: A second through hole is provided at the end of the boss, a first threaded hole is provided inside the plug rod, and the fastener is configured to pass through the second through hole and connect with the first threaded hole.

3. The diaphragm assembly according to claim 2, characterized in that: The plug head is provided with a first annular convex strip arranged around the plug rod on a side close to the diaphragm.

4. The diaphragm assembly according to claim 2, characterized in that: A second annular convex strip is arranged on the outer side of the plug rod.

5. The diaphragm assembly according to claim 2, characterized in that: The outer diameters of the plug rod and the boss gradually decrease along their extending directions.

6. The diaphragm assembly according to claim 1, characterized in that The boss is a hole-free structure, the balance wheel seat also includes a second threaded hole, the fastener includes a claw-type structure and a screw, the claw-type structure is configured to pass through the plug-in hole and clamp the boss, and the screw is configured to compress the claw-type structure toward the center when being screwed into the second threaded hole.

7. The diaphragm assembly according to claim 6, characterized in that The plug rod and the boss are shaped in an extending direction such that the middle portion is small and the ends are large.

8. The diaphragm assembly according to claim 1, characterized in that A convex portion is provided on the surface of the plug head on the side close to the diaphragm, and a concave portion is provided on the surface of the diaphragm body. The convex portion cooperates with the concave portion and is configured to block the rotation of the piston push block.

9. The diaphragm assembly according to claim 1, characterized in that: The surface of the plug head is provided with two grooves, and the two grooves are configured to clamp the piston push block.

10. The diaphragm assembly according to claim 1, characterized in that A gasket is arranged between the intermediate piece and the balance wheel seat, and a third through hole is arranged on the gasket for the boss to be inserted into.

11. The diaphragm assembly according to claim 1, characterized in that The cross section of the boss is a non-circular cross section.

12. The diaphragm assembly according to claim 1, characterized in that The diaphragm body comprises a circular disk, and the boss is located at a position on the circular disk that is deviated from the center and close to the edge.

13. The diaphragm assembly according to claim 1, characterized in that The thickness of a portion of the diaphragm sheet contacting an edge of the first through hole is greater than the thickness of the remaining portion of the diaphragm sheet.

14. The diaphragm assembly according to claim 1, characterized in that The edge of the first through hole of the intermediate piece is provided with a step, and the diaphragm assembly further comprises a gasket, which is arranged on the step and is made of a polytetrafluoroethylene material.

15. The diaphragm assembly according to claim 1, characterized in that The diaphragm body and the boss are integrally formed, and the diaphragm is made of elastic material.

16. The diaphragm assembly according to claim 1, characterized in that The piston push block is made of nylon and glass fiber composite material.

17. A diaphragm pump, comprising a pump head cover, a piston valve body, an eccentric cam, a motor and a diaphragm assembly according to any one of claims 1 to 16, wherein: The eccentric cam is installed in the diaphragm assembly, and the motor is connected to the eccentric cam and drives the eccentric cam to rotate.

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