Pneumatic pressure seal type multi-stage pump
By using a pneumatic sealing structure and transfer device, the problem of easy leakage in traditional multi-stage pump sealing structures is solved, achieving long-term stable sealing and safe transfer of leaked fluid, ensuring the safety of the transmission process and environmental protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-17
- Publication Date
- 2026-03-03
AI Technical Summary
The sealing structure of traditional multistage pumps is prone to elastic fatigue after prolonged use, leading to leakage, which may have environmental and health impacts, especially when transporting corrosive liquids.
It adopts a pneumatic sealing structure, which uses high-pressure gas in the high-pressure chamber to squeeze the diaphragm, and maintains a sealing fit with the sealing channel through the pneumatic seal. In case of leakage, the leaking fluid is collected by the transfer device to avoid pollution.
It provides a more stable and longer-lasting seal, ensuring safety and environmental protection during transmission, and reducing the impact on the environment and health.
Smart Images
Figure CN115949592B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of multistage pump technology, specifically relating to a pneumatically sealed multistage pump. Background Technology
[0002] A multistage pump consists of multiple impellers mounted on a single pump shaft, connected in series to work together. As the liquid passes through each impeller in sequence, its energy increases with centrifugal force, ultimately achieving the highest head.
[0003] During the transmission process, the pressure generated by the fluid being transmitted by the multistage pump gradually increases. In order to ensure the stable transmission of high pressure fluid, a more reliable sealing structure needs to be set at the joint between the pump shaft and the housing. The traditional sealing structure generally consists of a pump cover, a sealing seat and a spring arranged sequentially from the outside to the inside on the pump shaft. The spring presses the sealing seat against the pump cover, and the pump cover and the sealing seat form a sealing fit.
[0004] Such a sealing structure has certain drawbacks. The spring will experience elastic fatigue after working for a certain period of time. Elastic fatigue is an extremely slow process with no obvious symptoms. It is usually only discovered when the pump cover is found to be leaking liquid during inspection. Nowadays, multistage pumps are not only used to transport water, but also to transport corrosive liquids. If this part of the liquid leaks, it may pollute the environment or affect the health of the workers. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a pneumatically sealed multistage pump that can maintain a stable sealing effect for a long time and safely transfer corrosive fluids.
[0006] To achieve the above objectives, the present invention provides a pneumatically sealed multistage pump, comprising a pump body, a rotatable pump shaft passing through the pump body along the axial direction, a plurality of pump chambers arranged axially within the pump body, an impeller located in each of the pump chambers on the pump shaft, pump covers at both ends of the pump body, the pump covers having through holes for the pump shaft to pass through and a third sealing ring installed in the through holes, a diaphragm pressed between the pump covers and the pump body, the diaphragm dividing the space between the pump covers and the pump body into a high-pressure chamber away from the pump body and a sealing chamber close to the pump body, the pump cover having an air source interface connecting the high-pressure chamber to a high-pressure air source, the pump body having a sealing channel connecting the sealing chamber to an adjacent pump chamber, a diaphragm seat slidable on the pump shaft and rotatable relative to the pump shaft in the middle of the diaphragm, the diaphragm seat having a drive ring extending towards the pump body, the drive ring being... A pneumatic seal is provided at the other end of the diaphragm seat. The pneumatic seal includes a central ring fitted onto the pump shaft and a sealing wing surrounding the central ring. The sealing wing gradually tilts toward the high-pressure chamber as the radius increases. A limiting protrusion abutting against the central ring is provided on the pump shaft on the other side of the central ring opposite to the transmission ring. A first sealing ring is provided circumferentially on the end face of the limiting protrusion abutting against the central ring. A sealing wall extending toward the center and fitting against the sealing wing is provided on the inner circumference of the sealing channel on the other side of the sealing wing opposite to the high-pressure chamber. A plurality of second sealing rings are provided circumferentially on the end face of the sealing wall abutting against the sealing wing. A collection chamber and a collection channel connecting the collection chamber and the sealing channel are provided below the pump body. A transfer device for transferring and alerting the fluid inside the collection chamber is provided below the collection chamber.
[0007] Preferably, the pump body is equipped with a controller and an intake control valve, an exhaust control valve, and a pressure sensor connected to the controller circuit. The pressure sensor is installed in the high-pressure chamber. The air source interface is provided with an intake pipe connected to a high-pressure air source. The intake control valve is provided in the intake pipe. The exhaust control valve is provided on the side wall of the pump cover. The collection channel is provided with a flow sensor connected to the controller circuit.
[0008] Preferably, the pump body includes an inlet section and an outlet section, and multiple intermediate sections corresponding one-to-one with the pump chamber are superimposed between the inlet section and the outlet section. The inlet section and the outlet section are respectively provided with flanges that fix them together by screws. The collection channel includes a first section, a second section and a third section. The first section is located in the inlet section or the outlet section, the second section is located in the flange, and the third section is located outside the pump body and connects the first section and the second section. The collection chamber is fixed to the flange and located below the intermediate section, and the flow sensor is fixed to the second section.
[0009] Preferably, the transfer device includes a transfer tank, and an αβ valve is provided between the collection chamber and the transfer tank.
[0010] Preferably, the transfer container is made of transparent material, and warning scales are provided on the outside of the transfer container.
[0011] Preferably, the pump body has a sealing inclined surface surrounding the pump shaft on the end face facing the pump cover. The sealing inclined surface gradually approaches the pump cover from the inside to the outside. When the central ring abuts against the limiting protrusion, the sealing inclined surface and the diaphragm are in contact to form a sealing fit.
[0012] Preferably, a collection port in the shape of an inverted frustum is provided at the junction of the collection channel and the sealing channel.
[0013] Preferably, the pump cover is provided with a bracket, the bracket is provided with a bracket seat surrounding the pump shaft, the bracket seat is provided with a lubrication cavity, the bracket seat is provided with an installation port and a bracket cover that closes the installation port on the other side opposite to the pump cover, a bearing is provided at the end of the pump shaft, the pump shaft is provided with a bearing step that abuts against the end face of the bearing facing the pump body, the bracket cover is provided with a bearing limiting ring that extends to the lubrication cavity and abuts against the outer ring of the bearing, an oil injection channel is provided above the bracket seat, and an oil injection bolt is provided above the oil injection channel.
[0014] Preferably, a first clamping plate is integrally provided on the outer circumference of the diaphragm seat, and an installation ring is provided extending from the diaphragm seat to the pump cover. The installation ring is fitted with a second clamping plate that forms a clamping fit with the inner edge of the diaphragm with the first clamping plate, and an assembly spring is fitted on the installation ring and compressed between the pump cover and the second clamping plate.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] 1. The traditional sealing method is changed. The high-pressure gas in the high-pressure chamber squeezes the diaphragm, and the diaphragm transmits the force to the air pressure seal, so that it maintains a sealed fit with the sealing channel to cut off the pump chamber from the outside. Compared with the traditional spring structure, air pressure and diaphragm can provide a more stable force with a longer service life.
[0017] 2. The pneumatic seal, consisting of a central ring and sealing wing, has an outer circumference that forms a sealing fit with a sealing wall of the same inclination, and an inner circumference that forms a sealing fit with a limiting protrusion. As the sealing wing gradually inclines toward the high-pressure chamber with increasing radius, it can achieve a more reliable sealing fit with the sealing wall.
[0018] 3. In the event of a malfunction or abnormal water pressure in the pump body, there may still be some leakage. The transfer device will collect the leaked fluid in the collection chamber to avoid environmental pollution or impact on the health of workers, and it can also be easily transferred to a safe location. Attached Figure Description
[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;
[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.
[0022] In the diagram: 1. Pump body; 11. Pump chamber; 2. Pump shaft; 21. Impeller; 3. Pump cover; 31. Third sealing ring; 4. Diaphragm; 32. High-pressure chamber; 33. Sealing chamber; 321. Air source interface; 12. Sealing channel; 41. Diaphragm seat; 411. Drive ring; 412. Central ring; 413. Sealing side wing; 22. Limiting protrusion; 221. First sealing ring; 121. Sealing wall; 122. Second sealing ring; 5. Collection chamber; 51. Collection channel; 6. Controller; 322. Inlet control valve; 323. Outlet control valve; 324. Pressure sensor; 325. Inlet pipe; 52 13. Flow sensor; 14. Suction section; 15. Discharge section; 16. Intermediate section; 131. Flange; 511. First section; 512. Second section; 513. Third section; 53. Transfer tank; 54. αβ valve; 531. Warning scale; 16. Sealing bevel; 514. Collection port; 34. Bracket; 35. Bracket base; 351. Lubrication chamber; 352. Bracket cover; 353. Bearing; 23. Bearing step; 354. Bearing limit ring; 355. Oil injection channel; 356. Oil injection bolt; 414. First clamping plate; 415. Mounting ring; 416. Second clamping plate; 417. Assembly spring. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] Please see Figure 1-3This invention provides a pneumatically sealed multistage pump, comprising a pump body 1, a rotatable pump shaft 2 passing through the pump body 1 along the axial direction, a plurality of pump chambers 11 arranged axially inside the pump body 1, an impeller 21 located in each of the pump chambers 11 on the pump shaft 2, pump covers 3 at both ends of the pump body 1, the pump covers 3 having through holes for the pump shaft 2 to pass through and a third sealing ring 31 installed in the through holes, and a diaphragm 4 pressed between the pump covers 3 and the pump body 1, the diaphragm 4 dividing the space between the pump covers 3 and the pump body 1. The pump cover 3 is divided into a high-pressure chamber 32 away from the pump body 1 and a sealed chamber 33 close to the pump body 1. The pump cover 3 is provided with an air source interface 321 connecting the high-pressure chamber 32 to a high-pressure air source. The pump body 1 is provided with a sealed channel 12 connecting the sealed chamber 33 to the adjacent pump chamber 11. A diaphragm seat 41 is provided in the middle of the diaphragm 4, sliding on the pump shaft 2 and rotatable relative to the pump shaft 2. The diaphragm seat 41 is provided with a drive ring 411 extending towards the pump body 1. The drive ring 411 is positioned relative to the other side of the diaphragm seat 41. One end is provided with a pneumatic seal, which includes a central ring 412 fitted onto the pump shaft 2 and a sealing wing 413 surrounding the central ring 412. The sealing wing 413 gradually tilts towards the high-pressure chamber 32 as the radius increases. The pump shaft 2 is provided with a limiting protrusion 22 on the other side of the central ring 412 opposite to the transmission ring 411, which abuts against the central ring 412. The end face of the limiting protrusion 22 that abuts against the central ring 412 is provided with a first sealing ring 221 circumferentially. The sealing channel 12 A sealing wall 121 extending towards the center and fitting against the sealing wing 413 is provided on the inner periphery of the sealing side wing 413 on the other side opposite to the high-pressure chamber 32. A plurality of second sealing rings 122 are provided circumferentially on the end face of the sealing wall 121 that abuts against the sealing wing 413. A collection chamber 5 and a collection channel 51 connecting the collection chamber 5 and the sealing channel 12 are provided below the pump body 1. A transfer device is provided below the collection chamber 5 to transfer the fluid inside and provide a notification.The traditional sealing method is changed. The high-pressure gas in the high-pressure chamber 32 squeezes the diaphragm 4, and the diaphragm 4 transmits the force to the pneumatic seal, which maintains a sealed fit with the sealing channel 12 to cut off the pump chamber 11 from the outside. Compared with the traditional spring structure, the pneumatic seal and the diaphragm 4 can provide a more stable force with a longer service life. At the same time, the pneumatic seal, which is composed of the central ring 412 and the sealing wing 413, forms a sealing fit with the sealing wall 121 with the same inclination on the outer periphery and a sealing fit with the limiting protrusion 22 on the inner periphery. Since the sealing wing 413 gradually inclines towards the high-pressure chamber 32 as the radius increases, it can achieve a more reliable sealing fit with the sealing wall 121. In addition, there will still be some leakage in case of failure or abnormal water pressure in the pump body 1. The transfer device will collect the leaked fluid in the collection chamber 5 to avoid environmental pollution or impact on the health of the staff, and it can also be easily transferred to a safe location.
[0025] Please see Figure 1 , Figure 3 The pump body 1 is equipped with a controller 6 and an inlet control valve 322, a vent control valve 323, and a pressure sensor 324, all of which are electrically connected to the controller 6. The pressure sensor 324 is installed in the high-pressure chamber 32. The air source interface 321 is provided with an inlet pipe 325 connected to a high-pressure air source. The inlet control valve 322 is located in the inlet pipe 325. The vent control valve 323 is located on the side wall of the pump cover 3. The collection channel 51 is provided with a flow sensor 52 electrically connected to the controller 6. In this embodiment, since the gas in the high-pressure chamber 32 will still contain... With a certain amount of leakage, the existing controller 6 can be used to coordinate various electrical control components. The air pressure sensor 324 constantly senses the air pressure in the high-pressure chamber 32. When the air pressure reaches the set value, the air intake control valve 322 is opened in time to allow air intake. After the air pressure returns to the set value, the air intake is stopped, making the control more intelligent. At the same time, when disassembly and maintenance are required, the air release control valve 323 can be used to quickly release air, avoiding the impact of the pump cover 3 on the staff and improving practicality. The addition of a flow sensor 52 will stop the machine in time when a large flow is sensed, avoiding the transfer device from being fully loaded and reducing the sealing pressure.
[0026] Please see Figure 1-3The pump body 1 includes an intake section 13 and an outlet section 14. Multiple intermediate sections 15, corresponding one-to-one with the pump chamber 11, are stacked between the intake section 13 and the outlet section 14. The intake section 13 and the outlet section 14 are each provided with a flange 131 fixed to them by screws. The collection channel 51 includes a first section 511, a second section 512, and a third section 513. The first section 511 is located in either the intake section 13 or the outlet section 14. The second section 512 is located in the flange 131. The third section 511... 13 is located outside the pump body 1 and connects the first section 511 and the second section 512. The collection chamber 5 is fixed to the flange 131 and located below the middle section 15. The flow sensor 52 is fixed to the second section 512. In this embodiment, the existing structure is reasonably utilized to divide the collection channel 51 into sections, thereby transferring the collection chamber 5 to the middle section 15 with more space. The space is reasonably utilized to increase the volume of the collection chamber 5. In addition, the flow sensor 52 is also externally mounted in the second section 512, which is convenient for connection and observation and improves practicality.
[0027] Please see Figure 2 The transfer device includes a transfer tank 53, and an αβ valve 54 is provided between the lower part of the collection chamber 5 and the transfer tank 53. In this embodiment, the collection chamber 5 and the transfer tank 53 connected by the αβ valve 54 can be automatically connected when the transfer tank 53 is installed below the collection chamber 5 and automatically disconnected when it is removed from below the collection chamber 5. This greatly avoids the leakage of fluid to the work site, and facilitates the transfer of the leaked fluid while avoiding pollution to the environment or impact on the health of the workers.
[0028] Please see Figure 2 The transfer tank 53 is made of transparent material, and a warning scale 531 is provided on the outside of the transfer tank 53. In this embodiment, the total amount of fluid leakage can be observed at any time in the transparent transfer tank 53. When the total amount reaches a certain warning scale 531, it is necessary to disassemble the machine for inspection and maintenance.
[0029] Please see Figure 2-3 The pump body 1 has a sealing inclined surface 16 surrounding the pump shaft 2 on its end face facing the pump cover 3. The sealing inclined surface 16 gradually approaches the pump cover 3 from the inside out. When the central ring 412 abuts against the limiting protrusion 22, the sealing inclined surface 16 and the diaphragm 4 are in contact to form a sealing fit. In this embodiment, the sealing inclined surface 16 is added to form a double sealing structure with the diaphragm 4 to prevent leakage of the medium from this point. On the other hand, it limits the maximum deformation of the diaphragm 4, thereby extending its service life.
[0030] Please see Figure 3The collection channel 51 and the sealing channel 12 are connected by a collection port 514 in the shape of an inverted frustum. In this embodiment, the collection port 514 in the shape of an inverted frustum is added to collect the leaked fluid to the collection channel 51 in a timely manner, thereby reducing the sealing pressure between the sealing slope 16 and the diaphragm 4 and ensuring the sealing effect.
[0031] Please see Figure 3 The pump cover 3 is provided with a bracket 34, and the bracket 34 is provided with a bracket seat 35 surrounding the pump shaft 2. The bracket seat 35 is provided with a lubrication cavity 351. The bracket seat 35 is provided with an installation port and a bracket cover 352 that closes the installation port on the other side opposite to the pump cover 3. A bearing 353 is provided at the end of the pump shaft 2. The pump shaft 2 is provided with a bearing step 23 that abuts against the end face of the bearing 353 facing the pump body 1. The bracket cover 352 is provided with a part that extends into the lubrication cavity 351 and abuts against the bearing 353. The outer ring abuts the bearing limiting ring 354. An oil injection channel 355 is provided above the bracket seat 35, and an oil injection bolt 356 is provided above the oil injection channel 355. In this embodiment, clean lubricating oil is injected into the lubrication chamber 351 through the oil injection bolt 356 to cool and lubricate the bearing 353, making the working state of the pump shaft 2 more stable. In addition, the bracket cover 352 that closes the lubrication chamber 351 is used in a reasonable way, and the bearing limiting ring 354 on it cooperates with the bearing step 23 on the pump shaft 2 to simplify the installation structure of the bearing 353.
[0032] Please see Figure 3 The outer circumference of the diaphragm seat 41 is integrally provided with a first clamping plate 414, and the diaphragm seat 41 extends toward the pump cover 3 with an installation ring 415. The installation ring 415 is fitted with a second clamping plate 416 that clamps the inner edge of the diaphragm 4 with the first clamping plate 414. The installation ring 415 is fitted with an assembly spring 417 that is compressed between the pump cover 3 and the second clamping plate 416. In this embodiment, the addition of the assembly spring 417 expands the high-pressure chamber 32 when no air is introduced, ensuring the initial air volume in the high-pressure chamber 32 can quickly reach the set air pressure after air is introduced, thereby improving the start-up rate. At the same time, the assembly spring 417 causes the diaphragm 4 to deform into a regular shape, extending its service life.
[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A gas pressure seal type multistage pump comprising a pump body (1), characterized by, The pump body (1) is provided with a rotatable pump shaft (2) penetrating in the axial direction, a plurality of pump chambers (11) are arranged in the axial direction in the pump body (1), the pump shaft (2) is provided with an impeller (21) located in each of the pump chambers (11), pump covers (3) are arranged at both ends of the pump body (1), the pump cover (3) is provided with a through hole for the pump shaft (2) to penetrate and a third sealing ring (31) mounted on the through hole, a diaphragm (4) is arranged in compression between the pump cover (3) and the pump body (1), the diaphragm (4) divides the space between the pump cover (3) and the pump body (1) into a high-pressure cavity (32) away from the pump body (1) and a sealing cavity (33) close to the pump body (1), the pump cover (3) is provided with a gas source interface (321) for connecting the high-pressure cavity (32) with a high-pressure gas source, the pump body (1) is provided with a sealing channel (12) for connecting the sealing cavity (33) with adjacent pump chambers (11), a diaphragm seat (41) is arranged in the middle of the diaphragm (4) and can slide on the pump shaft (2) and rotate relative to the pump shaft (2), the diaphragm seat (41) is provided with a transmission ring (411) extending towards the pump body (1), the other end of the transmission ring (411) relative to the diaphragm seat (41) is provided with a gas pressure sealing element, the gas pressure sealing element includes a center ring (412) sleeved on the pump shaft (2) and a sealing side wing (413) surrounding the center ring (412), the sealing side wing (413) gradually tilts towards the high-pressure cavity (32) as the radius increases, the pump shaft (2) is located on the other side of the center ring (412) relative to the transmission ring (411) and is provided with a limiting protrusion (22) abutting against the center ring (412), the end surface of the limiting protrusion (22) abutting against the center ring (412) is provided with a first sealing ring (221) in the circumferential direction, the inner wall of the sealing channel (12) is provided with a sealing wall (121) extending towards the center and abutting against the sealing side wing (413) on the other side of the sealing side wing (413) relative to the high-pressure cavity (32), the end surface of the sealing wall (121) abutting against the sealing side wing (413) is provided with a plurality of second sealing rings (122) in the circumferential direction, the pump body (1) is located below the sealing channel (12) and is provided with a collection chamber (5) and a collection channel (51) connecting the collection chamber (5) with the sealing channel (12), the collection chamber (5) is provided below with a transfer device for transferring fluid in the collection chamber (5) and reminding.
2. The gas pressure seal type multistage pump according to claim 1, characterized by The pump body (1) is provided with a controller (6), and an air inlet control valve (322), an air outlet control valve (323) and an air pressure sensor (324) connected with the controller (6) in an electrical circuit, the air pressure sensor (324) is installed in the high-pressure cavity (32), the air source interface (321) is provided with an air inlet pipeline (325) connected with a high-pressure air source, the air inlet control valve (322) is arranged in the air inlet pipeline (325), the air outlet control valve (323) is arranged on the side wall of the pump cover (3), and the collection channel (51) is provided with a flow sensor (52) connected with the controller (6) in an electrical circuit.
3. The gas pressure seal type multistage pump according to claim 2, characterized by The pump body (1) comprises a suction section (13) and a discharge section (14), a plurality of middle sections (15) corresponding to the pump chamber (11) one by one are arranged between the suction section (13) and the discharge section (14), the suction section (13) and the discharge section (14) are respectively provided with flange plates (131) fixed by a screw rod, the collection channel (51) comprises a first section (511), a second section (512) and a third section (513), the first section (511) is located in the suction section (13) or the discharge section (14), the second section (512) is located in the flange plate (131), and the third section (513) is located outside the pump body (1) and communicates the first section (511) and the second section (512), the collection chamber (5) is fixed to the flange plate (131) and located below the middle section (15), and the flow sensor (52) is fixed to the second section (512).
4. The gas pressure seal type multistage pump according to claim 1, characterized by The transfer device comprises a transfer tank (53), and an αβ valve (54) is arranged between the collection chamber (5) and the transfer tank (53).
5. The gas pressure seal type multistage pump according to claim 4, wherein The transfer tank (53) is made of transparent material, and a warning scale (531) is arranged on the outer side of the transfer tank (53).
6. The gas pressure seal type multistage pump according to claim 1, characterized by The end surface of the pump body (1) facing the pump cover (3) is provided with a sealing inclined surface (16) surrounding the pump shaft (2), the sealing inclined surface (16) gradually approaches the pump cover (3) from the inside to the outside, and when the center ring (412) abuts against the limiting protrusion (22), the sealing inclined surface (16) abuts against the diaphragm (4) to form a sealing fit.
7. The gas pressure seal type multistage pump according to claim 1, characterized by The collection channel (51) is provided with a collection port (514) in the shape of an inverted circular truncated cone at the communication position of the collection channel (51) and the sealing channel (12).
8. The gas pressure seal type multistage pump according to claim 1, characterized by The pump cover (3) is provided with a bracket (34), the bracket (34) is provided with a bracket seat (35) surrounding the pump shaft (2), a lubricating cavity (351) is arranged in the bracket seat (35), the bracket seat (35) is provided with a mounting port and a bracket cover (352) closing the mounting port relative to the other side of the pump cover (3), the pump shaft (2) is provided with a bearing (353) at the end, the pump shaft (2) is provided with a bearing step (23) abutting the end face of the bearing (353) towards the pump body (1), the bracket cover (352) is provided with a bearing limiting ring (354) extending to the lubricating cavity (351) and abutting the outer ring of the bearing (353), an oil injection channel (355) is arranged above the bracket seat (35), and an oil injection bolt (356) is arranged above the oil injection channel (355).
9. The gas seal type multistage pump according to claim 1, characterized by The diaphragm seat (41) is integrally provided with a first clamping plate (414) on the outer periphery, the diaphragm seat (41) is provided with a mounting ring (415) extending to the pump cover (3), the mounting ring (415) is sleeved with a second clamping plate (416) which forms clamping cooperation with the inner edge of the diaphragm (4) together with the first clamping plate (414), and the mounting ring (415) is sleeved with an assembly spring (417) compressed between the pump cover (3) and the second clamping plate (416).
Citation Information
Patent Citations
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