Diaphragm pump outlet buffer

Abstract

The invention relates to a buffer, in particular to a diaphragm pump outlet buffer. The problems that an existing buffer is unreliable in starting, poor in buffering effect or complex in structure and high in manufacturing and using cost are mainly solved. And working condition monitoring cannot be carried out. The buffer comprises a top flange, a bottom flange, a shell, a guide assembly, a position monitoring device, a limiting block and an air bag. The device is simple in structure; when the pressure of the conveying medium reaches the set pressure, the conveying medium pushes away the spherical valve element and enters the shell, the buffer starts to work, and starting work is reliable. The working process of the buffer is safe and reliable through the guide assembly and the limiting block; meanwhile, the position monitoring device can give an alarm in time when the moving end of the guide assembly exceeds the position upper limit or the position lower limit, and reliable operation is further guaranteed.

Description

Technical Field

[0001] This invention relates to a buffer, and more specifically to a diaphragm pump outlet buffer. Background Technology

[0002] Diaphragm pumps transport media through reciprocating motion. The instantaneous flow rate of the pump output changes pulsatingly with time according to a trigonometric function. At this time, the flow rate must be compensated by an outlet buffer to ensure the stability of the outlet flow rate and pressure of the diaphragm pump.

[0003] The current technical status of diaphragm pump outlet buffers is as follows: 1. Some diaphragm pump outlet buffers have relatively simple structures, but their performance is poor, specifically in two aspects: 1) Unreliable startup; the buffer often fails to start when the set pressure is reached; 2) Significant pulsation in the diaphragm pump outlet pressure and flow rate, resulting in poor buffering effect. 2. Some diaphragm pump outlet buffers have reliable startup and good buffering effect, with minimal flow and pressure pulsation, but their structures are more complex, leading to higher manufacturing and operating costs. 3. Existing diaphragm pump outlet buffers lack operational condition monitoring and cannot meet the requirements for high-reliability operation. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing buffers, such as unreliable start-up, poor buffering effect, or complex structure with high manufacturing and usage costs; as well as the technical problem of inability to monitor operating conditions, and to provide a diaphragm pump outlet buffer.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A diaphragm pump outlet buffer, which is special in that: Includes top flange, bottom flange, housing, guide assembly, position monitoring device, limit block and airbag; The top flange and bottom flange are respectively sealed at the openings at the upper and lower ends of the housing; The bottom flange is used to connect to the outlet of the diaphragm pump and receive the medium output by the diaphragm pump; The fixed end of the guide assembly is sealed and mounted on the top flange, while the moving end is placed inside the housing. The position monitoring device is installed on the guide assembly to monitor the upper and lower limits of the position of the moving end of the guide assembly, and to issue an alarm when the upper or lower limit of the position is exceeded. The shape of the airbag is adapted to the inner cavity of the shell, and its opening is fixed to the upper inner side of the shell, forming an airbag buffer cavity; the airbag buffer cavity is filled with buffer gas; the airbag is provided with a sandwich layer adapted to the sealing body, and the sealing body is provided in the sandwich layer; the outer wall of the airbag at the sealing body is adapted to the inner opening of the bottom flange, so as to fit against the inner opening of the bottom flange in the initial state to form a sealing contact; The limiting block is set inside the airbag buffer cavity, and has a positioning surface that matches the inner opening of the top flange. It is then fixed to the moving end of the guide assembly from top to bottom along with the sealing body.

[0006] Furthermore, the guide assembly includes a connecting block, a guide sleeve, a sleeve, and a guide rod; The connecting block is installed at the outer opening of the top flange, and the sleeve is installed on the mounting hole in the middle of the connecting block; The guide sleeve is installed at the lower end of the inner hole of the sleeve, and its outer wall is provided with a through groove to connect the inner hole of the sleeve with the airbag buffer cavity. The inner hole of the guide sleeve is adapted to the outer wall of the guide rod; the guide rod is slidably installed in the guide sleeve, and its lower end is placed in the airbag buffer cavity; the limiting block and the sealing body are fixed to the lower end of the guide rod from top to bottom. The position monitoring device includes a positioning ring and two position monitors; The positioning ring is installed at the upper end of the guide rod; The two position monitors are respectively installed on the sleeve, with their monitoring ends placed inside the sleeve. The two position monitors are spaced apart along the length of the sleeve, and are used to monitor the upper and lower limits of the guide rod through the positioning ring, and to issue an alarm when the upper or lower limit is exceeded.

[0007] Furthermore, the lower side of the limiting block is fitted to the inner side of the airbag located at the sealing body, and the upper side is fixed to the guide rod by a nut.

[0008] Furthermore, a screw plug is installed at the upper end of the sleeve; Sealing rings are provided at the connection between the screw plug and the sleeve, the connection between the connecting block and the top flange, and the connection between the sleeve and the connecting block; The positioning ring is a positioning magnetic ring.

[0009] Furthermore, the lower outer periphery of the top flange is provided with an annular groove that matches the opening of the airbag. The opening of the airbag is fitted onto the annular groove of the top flange and fixed to the upper opening of the housing by the top flange.

[0010] Furthermore, a sealing ring and a sealing gasket are provided at the connection between the bottom flange and the housing.

[0011] Furthermore, the lower end of the sealing body is a spherical end face, and the inner opening of the bottom flange is a tapered opening.

[0012] Furthermore, the buffer gas is nitrogen, and the airbag is a rubber airbag.

[0013] Meanwhile, the present invention also provides another diaphragm pump outlet buffer, which is special in that: Includes top flange, bottom flange, housing, guide assembly, position monitoring device, limit block, sealing body and airbag; The top flange and bottom flange are respectively sealed at the openings at the upper and lower ends of the housing; The bottom flange is used to connect to the outlet of the diaphragm pump and receive the medium output by the diaphragm pump; The fixed end of the guide assembly is sealed and mounted on the top flange, while the moving end is placed inside the housing. The position monitoring device is installed on the guide assembly to monitor the upper and lower limits of the position of the moving end of the guide assembly, and to issue an alarm when the upper or lower limit of the position is exceeded. The opening of the airbag is fixed at the lower opening of the shell, and an airbag buffer cavity is formed inside it, which is connected to the outlet of the diaphragm pump; the part of the shell outside the airbag buffer cavity is filled with buffer gas. The sealing body and the limiting block are respectively fitted to the inner wall and outer wall of the airbag, and are fixed to the moving end of the guide assembly from top to bottom. The lower end of the sealing body is adapted to the inner opening of the bottom flange, and is used to fit against the inner opening of the bottom flange in the initial state to form a sealing contact; The limiting block is provided with a positioning surface that matches the inner opening of the top flange.

[0014] Furthermore, the guide assembly includes a guide sleeve, a bushing, and a guide rod; The sleeve is installed at the opening of the top flange; The guide sleeve is installed at the lower end of the inner hole of the sleeve, and its outer wall is provided with a through groove to connect the inner hole of the sleeve with the inside of the shell. The inner hole of the guide sleeve is adapted to the outer wall of the guide rod; the guide rod is slidably installed in the guide sleeve, with its lower end placed inside the housing, and the limiting block and the sealing body are fixed to the lower end of the guide rod from top to bottom; The position monitoring device includes a positioning ring and two position monitors; The positioning ring is installed at the upper end of the guide rod; The two position monitors are respectively installed on the sleeve, with their monitoring ends placed inside the sleeve. The two position monitors are spaced apart along the length of the sleeve, and are used to monitor the upper and lower limits of the guide rod through the positioning ring, and to issue an alarm when the upper or lower limit is exceeded.

[0015] Furthermore, the upper side of the limiting block is fixed to the guide rod by a nut.

[0016] Furthermore, a screw plug is installed at the upper end of the sleeve; A sealing ring is provided at the connection between the screw plug and the sleeve, and at the connection between the sleeve and the top flange; The positioning ring is a positioning magnetic ring.

[0017] Furthermore, the upper outer circumferential surface of the bottom flange is provided with an annular groove that matches the opening of the airbag. The opening of the airbag is fitted onto the annular groove of the bottom flange and fixed to the lower opening of the housing by the bottom flange.

[0018] Furthermore, the lower end of the sealing body is a spherical end face, and the inner opening of the bottom flange is a tapered opening that matches the lower end of the sealing body.

[0019] Furthermore, the buffer gas is nitrogen, and the airbag is a rubber airbag.

[0020] The beneficial effects of this invention are: 1. Simple structure, low cost, good buffering effect, and the outlet pressure pulsation of the diaphragm pump can be controlled within ±1%.

[0021] 2. Significantly improves the reliability of buffer and diaphragm pump systems.

[0022] 3. The conveying medium is highly corrosive. The second type of buffer in this invention does not have the conveying medium in contact with the housing, which significantly improves the lifespan of the housing and reduces the cost of using the buffer. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 1 The accompanying figure labels are as follows: 1-Top flange, 2-Bottom flange, 3-Shell; 4-Guide assembly, 41-Connecting block, 42-Guide sleeve, 43-Sleeve, 44-Guide rod, 45-Through groove, 46-Nut, 47-Plug; 5-Position monitoring device, 51-Positioning ring, 52-Position monitor; 6-Limiting block, 7-Airbag, 8-Sealing body, 9-Sealing ring, 10-Sealing gasket.

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 2 The accompanying figure labels are as follows: 1-Top flange, 2-Bottom flange, 3-Shell; 4-Guide assembly, 411-Guide sleeve, 412-Sleeve, 413-Guide rod, 414-Through groove, 415-Nut, 416-Plug; 5-Position monitoring device, 51-Positioning ring, 52-Position monitor; 6-Limiting block, 7-Airbag, 8-Sealing body, 9-Sealing ring. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. 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.

[0026] Example 1 An embodiment of the present invention provides a diaphragm pump outlet buffer, such as... Figure 1 As shown, the buffer includes a top flange 1, a bottom flange 2, a housing 3, a guide assembly 4, a position monitoring device 5, a limit block 6, and an airbag 7.

[0027] The top flange 1 and the bottom flange 2 are respectively installed at the openings at the top and bottom ends of the housing 3; in order to improve the sealing reliability, a sealing gasket 10 and a plurality of sealing rings 9 are respectively provided at the bottom flange 2 and the lower opening of the housing 3.

[0028] Bottom flange 2 is connected to the outlet of the diaphragm pump to be buffered, receiving the medium output by the diaphragm pump for buffering.

[0029] Specifically, the guide assembly 4 includes a connecting block 41, a guide sleeve 42, a sleeve 43, and a guide rod 44. The connecting block 41 is installed at the outer opening of the top flange 1, and a sealing ring 9 is provided at the connection between the connecting block 41 and the top flange 1. The sleeve 43 is installed on the mounting hole in the middle of the connecting block 41, and a screw plug 47 is installed at the upper end of the sleeve 43; similarly, sealing rings 9 are provided at the connection between the screw plug 47 and the sleeve 43, and at the connection between the sleeve 43 and the connecting block 41. The guide sleeve 42 is installed at the lower end of the inner hole of the sleeve 43, and a through groove 45 is provided on its outer wall to connect the inner hole of the sleeve 43 with the interior of the housing 3. The inner hole of the guide sleeve 42 is adapted to the outer wall of the guide rod 44; the guide rod 44 is slidably installed in the guide sleeve 42, sliding in the up-down direction, and the inner hole of the guide sleeve 42 supports the guide rod 44, realizing the stable reciprocating motion of the guide rod 44. The lower end of the guide rod 44 is placed inside the housing 3.

[0030] Specifically, the position monitoring device 5 includes a positioning ring 51 and two position monitors 52; wherein, the positioning ring 51 is a positioning magnetic ring. The positioning magnetic ring is installed on the upper end of the guide rod 44; the two position monitors 52 are respectively installed on the sleeve 43, with their monitoring ends respectively placed inside the sleeve 43, and the two position monitors 52 are spaced apart along the length of the sleeve 43. This interval can be specifically set according to the actual working conditions, and in this embodiment, it is not specifically limited. The two position monitors 52 are used to monitor the upper and lower limits of the guide rod 44 through the positioning magnetic ring. During the operation of the buffer, the guide rod 44 moves up and down reciprocally. If the position of the positioning magnetic ring is within the two position monitors 52, the position monitors 52 do not work; if the positioning magnetic ring moves outside the two position monitors 52, the position monitors 52 will issue an alarm.

[0031] The airbag 7 is made of high-quality rubber, and its shape is adapted to the inner cavity of the shell 3. The lower outer periphery of the top flange 1 is provided with an annular groove adapted to the opening of the airbag 7. The opening of the airbag 7 is fitted onto the annular groove of the top flange 1 and fixed to the upper opening of the shell 3 by the top flange 1. Since the airbag 7 is a vulnerable part and needs to be replaced periodically, the above-mentioned design allows the airbag 7 to be installed or removed through the top flange 1, making installation and disassembly convenient.

[0032] The airbag 7 is filled with a buffer gas, thereby forming an airbag buffer cavity inside the airbag 7. In this embodiment, the buffer gas is nitrogen; in other embodiments of the invention, an inert gas may also be used.

[0033] The airbag 7 is provided with a sandwich layer adapted to the sealing body 8. The sealing body 8 is provided inside the sandwich layer. The lower end of the sealing body 8 is a spherical end face. The outer wall of the airbag 7 located at the sealing body 8 is adapted to the inner opening of the bottom flange 2. The metal sphere and rubber form a spherical valve core, which is used to fit against the inner opening of the bottom flange 2 in the initial state to form a sealing contact. The inner cone angle of the bottom flange 2 is α, which forms a reliable seal with the spherical valve core to realize the rapid start-up response of the buffer.

[0034] The limiting block 6 is installed inside the airbag buffer cavity, and it has positioning surfaces, namely inclined surfaces A and B, that are adapted to the inner opening of the top flange 1. The limiting block 6 limits the upward movement limit of the airbag 7 and related parts, ensuring the safety and reliability of the buffer during operation. The lower side of the limiting block 6 is fitted to the inner side of the airbag 7 at the sealing body 8, and the upper side is fixed to the guide rod 44 by a nut 46.

[0035] Example 2 Another diaphragm pump outlet buffer provided in this embodiment of the invention, such as Figure 2 As shown, the buffer includes a top flange 1, a bottom flange 2, a housing 3, a guide assembly 4, a position monitoring device 5, a limit block 6, a sealing body 8, and an airbag 7.

[0036] The top flange 1 and the bottom flange 2 are respectively installed at the openings at the upper and lower ends of the housing 3; in order to improve the sealing reliability, sealing rings 9 are respectively provided at the top flange 1 and the upper opening of the housing 3.

[0037] Bottom flange 2 is connected to the outlet of the diaphragm pump to be buffered, receiving the medium output by the diaphragm pump for buffering.

[0038] Specifically, the guide assembly 4 includes a guide sleeve 411, a sleeve 412, and a guide rod 413. The sleeve 412 is installed at the outer opening of the top flange 1, and a sealing ring 9 is provided at the connection between the sleeve 412 and the top flange 1. A screw plug 416 is installed at the upper end of the sleeve 412; similarly, a sealing ring 9 is provided at the connection between the screw plug 416 and the sleeve 412. The guide sleeve 411 is installed at the lower end of the inner hole of the sleeve 412, and a through groove 414 is provided on its outer wall to connect the inner hole of the sleeve 412 with the interior of the housing 3. The inner hole of the guide sleeve 411 is adapted to the outer wall of the guide rod 413; the guide rod 413 is slidably installed inside the guide sleeve 411, sliding in the up-down direction. The inner hole of the guide sleeve 411 supports the guide rod 413, enabling stable reciprocating motion of the guide rod 413. The lower end of the guide rod 413 is placed inside the housing 3.

[0039] Specifically, the position monitoring device 5 includes a positioning ring 51 and two position monitors 52; wherein, the positioning ring 51 is a positioning magnetic ring. The positioning magnetic ring is installed on the upper end of the guide rod 413; the two position monitors 52 are respectively installed on the sleeve 412, with their monitoring ends respectively placed inside the sleeve 412, and the two position monitors 52 are spaced apart along the length of the sleeve 412. This interval can be specifically set according to the actual working conditions, and in this embodiment, it is not specifically limited. The two position monitors 52 are used to monitor the upper and lower limits of the guide rod 413 through the positioning magnetic ring. During the operation of the buffer, the guide rod 413 moves up and down reciprocally. If the position of the positioning magnetic ring is within the two position monitors 52, the position monitors 52 do not work; if the positioning magnetic ring is outside the two position monitors 52, the position monitors 52 will issue an alarm.

[0040] The airbag 7 is made of high-quality rubber, and its shape is adapted to the inner cavity of the shell 3. The upper outer circumferential surface of the bottom flange 2 is provided with an annular groove adapted to the opening of the airbag 7. The opening of the airbag 7 is fitted onto the annular groove of the bottom flange 2 and fixed to the lower opening of the shell 3 by the bottom flange 2. Since the airbag 7 is a consumable part and needs to be replaced periodically, the above-mentioned design allows the airbag 7 to be installed or removed through the bottom flange 2, making installation and disassembly convenient.

[0041] The housing 3 is filled with a buffer gas, which applies a buffering force to the outside of the airbag 7, forming an airbag buffer chamber inside the airbag to directly receive and buffer the output medium of the diaphragm pump. In this embodiment, the buffer gas is nitrogen; in other embodiments of the invention, an inert gas may also be used.

[0042] The sealing body is fitted to the inner wall of the airbag and fixed to the lower end of the guide rod. The lower end of the sealing body 8 is a spherical end face, which is adapted to the inner opening of the bottom flange 2, so as to fit against the inner opening of the bottom flange 2 in the initial state to form a sealing contact; the inner cone angle of the bottom flange 2 is α, which forms a reliable seal with the sealing body 8 to realize the rapid start-up response of the buffer.

[0043] The limiting block 6 is provided with positioning surfaces, namely inclined surfaces A and B, which are adapted to the inner opening of the top flange 1. The limiting block 6 limits the upward movement of the airbag 7 and related parts to the extreme position, ensuring the safety and reliability of the buffer during operation. The lower side of the limiting block 6 is fitted against the outer wall of the airbag 7, and the upper side is fixed to the lower end of the guide rod 413 by a nut 416.

[0044] When using: 1. When the buffer is not in operation, the spherical valve core or sealing body 8 presses against the inner conical surface (angle α) of the bottom flange 2, forming an effective seal, preventing the conveyed medium from entering the housing 3 or the airbag buffer chamber. When the pressure of the conveyed medium reaches the set pressure, the conveyed medium pushes open the spherical valve core or sealing body 8 and enters the housing 3 or the airbag buffer chamber, at which point the buffer begins to operate. The spherical valve core and sealing body 8 provide a reliable seal, and the buffer's starting pressure is clear and stable; once the set pressure is reached, the buffer immediately begins to operate, ensuring reliable buffer startup.

[0045] 2. After the buffer starts working, the airbag 7 moves up and down, and the guide rod (44 / 413) moves with the airbag 7 within the guide sleeve (42 / 411). Due to the guidance of the guide rod (44 / 413), the movement of the airbag 7 is stable, the buffering effect is also stable, and the buffering effect is very good.

[0046] 3. During the up-and-down movement of the airbag 7, the inclined surface A of the limiting block 6 and the inclined surface B of the top flange 1 form a positioning, limiting the extreme position of the upward movement of the airbag 7 and related parts, ensuring the safety and reliability of the buffer during operation.

[0047] 4. Two position monitors 52 are installed on the sleeve (43 / 412) to monitor the position of the positioning magnetic ring on the guide rod (44 / 413). During normal operation, the positioning magnetic ring is positioned between the two position monitors 52, ensuring good buffer performance, smooth operation, and high reliability. The diaphragm pump outlet pressure pulsation can be controlled within ±1%.

[0048] 5. During the operation of the buffer, the guide rod (44 / 413) moves up and down reciprocally. If the position of the positioning magnetic ring is within the two position monitors 52, the position monitors 52 will not operate; if the magnetic ring moves outside the two position monitors 52, the position monitors 52 will issue an alarm. If the position monitors 52 issue an alarm, the cause needs to be investigated. Not only the accumulator should be checked, but the entire diaphragm pump system should also be checked to promptly identify and resolve problems, ensuring the stable and reliable operation of the diaphragm pump system.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A diaphragm pump outlet buffer, characterized in that: It includes a top flange (1), a bottom flange (2), a housing (3), a guide assembly (4), a position monitoring device (5), a limit block (6), and an airbag (7); The top flange (1) and bottom flange (2) are respectively sealed at the openings at the upper and lower ends of the housing (3); The bottom flange (2) is used to connect to the outlet of the diaphragm pump to receive the buffer medium output by the diaphragm pump; The fixed end of the guide assembly (4) is sealed and installed on the top flange (1), and the moving end is placed inside the housing (3); The position monitoring device (5) is installed on the guide assembly (4) to monitor the upper and lower limits of the position of the moving end of the guide assembly (4) and to issue an alarm when the position exceeds the upper or lower limit. The opening of the airbag (7) is fixed to the upper opening of the housing (3), forming an airbag buffer cavity inside it; the airbag buffer cavity is filled with buffer gas; a sealing body (8) is provided on the airbag (7), and the outer wall of the airbag (7) located at the sealing body (8) is adapted to the inner opening of the bottom flange (2) to fit against the inner opening of the bottom flange (2) in the initial state to form a sealed contact; The limiting block (6) is set inside the airbag buffer cavity, and has a positioning surface that matches the inner opening of the top flange (1), and is fixed to the moving end of the guide assembly (4) from top to bottom along with the sealing body (8).

2. The diaphragm pump outlet buffer according to claim 1, characterized in that: The guide assembly (4) includes a connecting block (41), a guide sleeve (42), a sleeve (43), and a guide rod (44); The connecting block (41) is installed at the outer opening of the top flange (1), and the sleeve (43) is installed on the mounting hole in the middle of the connecting block (41); The guide sleeve (42) is installed at the lower end of the inner hole of the sleeve (43), and its outer wall is provided with a through groove (45) to connect the inner hole of the sleeve (43) with the airbag buffer cavity. The inner hole of the guide sleeve (42) is adapted to the outer wall of the guide rod (44); the guide rod (44) is slidably installed in the guide sleeve (42), and its lower end is placed in the airbag buffer cavity; the limiting block (6) and the sealing body (8) are fixed to the lower end of the guide rod (44) from top to bottom. The position monitoring device (5) includes a positioning ring (51) and two position monitors (52); The positioning ring (51) is installed at the upper end of the guide rod (44); The two position monitors (52) are respectively installed on the sleeve (43), with their monitoring ends placed inside the sleeve (43). The two position monitors (52) are spaced apart along the length of the sleeve (43) to monitor the upper and lower limits of the guide rod (44) through the positioning ring (51) respectively, and to issue an alarm when the upper or lower limit of the position is exceeded.

3. The diaphragm pump outlet buffer according to claim 2, characterized in that: The lower side of the limiting block (6) is fitted to the inner side of the airbag (7) located at the sealing body (8), and the upper side is fixed to the guide rod (44) by a nut (46); A screw plug (47) is installed at the upper end of the sleeve (43); A sealing ring (9) is provided at the connection between the screw plug (47) and the sleeve (43), the connection between the connecting block (41) and the top flange (1), and the connection between the sleeve (43) and the connecting block (41); The positioning ring (51) is a positioning magnetic ring.

4. The diaphragm pump outlet buffer according to any one of claims 1-3, characterized in that: The lower outer circumferential surface of the top flange (1) is provided with an annular groove that matches the opening of the airbag (7). The opening of the airbag (7) is fitted onto the annular groove of the top flange (1) and fixed to the housing (3) by the top flange (1).

5. The diaphragm pump outlet buffer according to claim 4, characterized in that: A sealing ring (9) and a sealing gasket (10) are provided at the connection between the bottom flange (2) and the housing (3); The lower end of the sealing body (8) is a spherical end face, and the inner opening of the bottom flange (2) is a conical opening; The buffer gas is nitrogen, and the airbag (7) is a rubber airbag.

6. A diaphragm pump outlet buffer, characterized in that: It includes a top flange (1), a bottom flange (2), a housing (3), a guide assembly (4), a position monitoring device (5), a limit block (6), a sealing body (8), and an airbag (7); The top flange (1) and bottom flange (2) are respectively sealed at the openings at the upper and lower ends of the housing (3); The bottom flange (2) is used to connect to the outlet of the diaphragm pump to receive the medium output by the diaphragm pump; The fixed end of the guide assembly (4) is sealed and installed on the top flange (1), and the moving end is placed inside the housing (3); The position monitoring device (5) is installed on the guide assembly (4) to monitor the upper and lower limits of the position of the moving end of the guide assembly (4) and to issue an alarm when the position exceeds the upper or lower limit. The opening of the airbag (7) is fixed at the lower opening of the housing (3), and an airbag buffer cavity is formed inside it, which is connected to the outlet of the diaphragm pump; the part of the housing (3) outside the airbag buffer cavity is filled with buffer gas. The sealing body (8) and the limiting block (6) are respectively attached to the inner wall and outer wall of the airbag (7), and are fixed to the moving end of the guide assembly (4) from top to bottom. The lower end of the sealing body (8) is adapted to the inner opening of the bottom flange (2) to fit against the inner opening of the bottom flange (2) in the initial state to form a sealing contact; The limiting block (6) is provided with a positioning surface that matches the inner opening of the top flange (1).

7. The diaphragm pump outlet buffer according to claim 6, characterized in that: The guide assembly (4) includes a guide sleeve (411), a sleeve (412), and a guide rod (413); The sleeve (412) is installed on the opening of the top flange (1); The guide sleeve (411) is installed at the lower end of the inner hole of the sleeve (412), and its outer wall is provided with a through groove (414) to connect the inner hole of the sleeve (412) with the inside of the shell (3); The inner hole of the guide sleeve (411) is adapted to the outer wall of the guide rod (413); the guide rod (413) is slidably installed in the guide sleeve (411), and its lower end is placed inside the housing (3); the limiting block (6) and the sealing body (8) are fixed to the lower end of the guide rod (413) from top to bottom. The position monitoring device (5) includes a positioning ring (51) and two position monitors (52); The positioning ring (51) is installed at the upper end of the guide rod (413); The two position monitors (52) are respectively installed on the sleeve (412), with their monitoring ends placed inside the sleeve (412). The two position monitors (52) are spaced apart along the length of the sleeve (412) to monitor the upper and lower limits of the guide rod (413) through the positioning ring (51) respectively, and to issue an alarm when the upper or lower limit of the position is exceeded.

8. The diaphragm pump outlet buffer according to claim 7, characterized in that: The upper side of the limiting block (6) is fixed to the guide rod (43) by a nut (415); A screw plug (416) is installed at the upper end of the sleeve (412); A sealing ring (9) is provided at the connection between the screw plug (416) and the sleeve (412), and at the connection between the sleeve (412) and the top flange (1); The positioning ring (51) is a positioning magnetic ring.

9. The diaphragm pump outlet buffer according to any one of claims 6-8, characterized in that: The upper outer circumferential surface of the bottom flange (2) is provided with an annular groove that matches the opening of the airbag (7). The opening of the airbag (7) is fitted onto the annular groove of the bottom flange (2) and fixed to the lower opening of the housing (3) by the bottom flange (2).

10. The diaphragm pump outlet buffer according to claim 9, characterized in that: The lower end of the sealing body (8) is a spherical end face, and the inner opening of the bottom flange (2) is a tapered opening that matches the lower end of the sealing body (8). The buffer gas is nitrogen, and the airbag (7) is a rubber airbag.

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