Replaceable diaphragm sealing assembly structure and diaphragm valve

Abstract

The invention relates to the technical field of diaphragm valves, and particularly discloses a replaceable diaphragm sealing assembly structure and a diaphragm valve, the replaceable diaphragm sealing assembly structure comprises a sealing ring, a center hole is formed in the sealing ring in a penetrating mode, annular grooves are formed in the two sides of the sealing ring, and the annular grooves are located on the outer side of the center hole; a connecting hole for communicating the two annular grooves is formed in the sealing ring, so that a medium in one annular groove can flow into the other annular groove through the connecting hole; the upper valve pad is fixedly arranged on one side of the sealing ring, and the upper valve pad is located on the outer side of the center hole; the diaphragm is arranged on the side, close to the upper valve pad, of the sealing ring, the edge of the diaphragm is fixedly connected with the sealing ring, and the diaphragm has elasticity so that the diaphragm can abut against the upper valve pad after being stressed. The valve pad can be replaced while the valve body is reserved.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm valves, and in particular to a replaceable diaphragm sealing assembly structure and a diaphragm valve. Background Art

[0002] The cut-off valve is also called a closed-circuit valve. Its function is to connect or cut off the medium in the pipeline. The diaphragm valve is a special form of cut-off valve. Its opening and closing parts are a diaphragm made of soft material, which separates the inlet channel and the outlet channel in the valve body. It is now widely used in various fields.

[0003] Reference Figure 1 The diaphragm valve comprises a valve cover 1, a valve stem 2, a valve body 3, a diaphragm 4 and a valve pad 5. A mounting hole 11 is provided at one end of the valve cover 1, and an internal thread is provided on the inner wall of the mounting hole 11. The valve stem 2 is slidably arranged in the valve cover 1, and one end of the valve stem 2 is located inside the mounting hole 11. The diaphragm 4 is fixedly arranged on one side of the mounting hole 11, and the diaphragm 4 is located at the end of the valve stem 2. An interface 31 is provided on the valve body 3, and an external thread is provided on the outer wall of the interface 31. The interface 31 of the valve body 3 is threadedly connected with the mounting hole 11 of the valve cover 1, so that the inside of the valve body 3 is connected with the inside of the valve cover 1. An inlet channel 32 and an outlet channel 33 are provided inside the valve body 3, and the end of the inlet channel 32 and the starting end of the outlet channel 33 are both located at the diaphragm 4. The valve pad 5 is fixedly connected to the valve body 3, and the valve pad 5 is located outside the end of the inlet channel 32, and the valve pad 5 can abut against the diaphragm 4.

[0004] When the valve stem 2 slides toward the side close to the valve body 3, the diaphragm 4 is forced to bend downward and abut against the valve pad 5, so that the inlet channel 32 and the outlet channel 33 are closed, blocking the flow of the medium; when the valve stem 2 slides in the opposite direction, the diaphragm 4 returns to its original state, and the diaphragm 4 is separated from the valve pad 5, so that the inlet channel 32 and the outlet channel 33 are connected, so that the medium can flow smoothly through the diaphragm valve.

[0005] In the above structure, the valve pad 5 is made of plastic, and one end of the valve pad 5 is riveted and fixed to the valve body 3. When the inlet channel 32 and the outlet channel 33 are connected, gas or liquid can flow through the gap between the diaphragm 4 and the valve pad 5. Impurities in the gas or liquid are easy to adhere to the outer surface of the valve pad 5. After long-term use, the process of the valve stem 2 pushing the diaphragm 4 downward is easy to cause damage to the surface of the valve pad 5 close to the diaphragm 4, such as surface scratches. Damage to the valve pad 5 will affect the close fit between the valve pad 5 and the diaphragm 4, thereby causing leakage problems; in order to ensure the normal use of the diaphragm valve, the valve pad 5 needs to be replaced.

[0006] Since one end of the valve gasket 5 is riveted and fixed on the valve body 3, the valve gasket 5 and the valve body 3 are tightly matched, so it is difficult for the user to remove and replace the valve gasket 5, so the assembly of the valve gasket 5 and the valve body 3 needs to be replaced as a whole to solve the leakage problem. However, since the manufacturing cost of the valve body 3 is relatively high, a solution to the leakage problem without replacing the whole body is needed. Summary of the invention

[0007] In order to replace the valve gasket while retaining the valve body, the present application provides a replaceable diaphragm sealing assembly structure and a diaphragm valve.

[0008] In a first aspect, the present application provides a replaceable diaphragm sealing assembly structure, which adopts the following technical solution: A replaceable diaphragm sealing assembly structure, comprising: A sealing ring, wherein a central hole is provided through the sealing ring, annular grooves are provided on both sides of the sealing ring, the annular grooves are located outside the central hole, and a connecting hole is provided on the sealing ring for connecting the two annular grooves to each other, so that the medium in one of the annular grooves can flow into the other annular groove through the connecting hole; An upper valve pad, the upper valve pad is fixedly arranged on one side of the sealing ring, and the upper valve pad is located outside the central hole; The diaphragm is arranged on a side of the sealing ring close to the upper valve pad, the edge of the diaphragm is fixedly connected to the sealing ring, and the diaphragm is elastic so that the diaphragm can be against the upper valve pad after being subjected to force.

[0009] By adopting the above technical solution, when the upper valve gasket is severely worn and needs to be replaced, the sealing assembly can be directly removed from the valve body and then replaced with a new sealing assembly. Therefore, the leakage problem caused by damage to the upper valve gasket can be solved without replacing the valve body, thereby reducing maintenance costs and solving the problem that the traditional riveted valve gasket is difficult to remove from the valve body and replace.

[0010] Optionally, a plurality of connection holes are provided and arranged in a circular array.

[0011] By adopting the above technical scheme, the connecting hole connects the annular grooves on the upper and lower sides of the sealing ring, so that the medium can flow from the annular groove on one side into the annular groove on the other side through the connecting hole; since there are multiple connecting holes, the parts connected between the two annular grooves are more, which helps to reduce the pressure loss during the flow of the medium; in this scheme, two annular grooves are provided, and the two annular grooves are connected to each other through the connecting hole, so after the sealing assembly is installed and the valve body is tightened, even if the sealing assembly is rotated so that the starting end of the outlet channel is not aligned with the connecting hole, the annular groove on one side of the sealing ring can still be connected to the starting end of the outlet channel, which helps to ensure the smooth flow of the medium.

[0012] Optionally, a lower valve pad is fixedly connected to the sealing ring at a side away from the upper valve pad.

[0013] By adopting the above technical solution, the lower valve gasket is pressed tightly between the sealing ring and the valve body, thereby enhancing the sealing effect between the sealing ring and the valve body, reducing the possibility of leakage here, and ensuring the normal use of the diaphragm valve.

[0014] Optionally, a gasket for abutting against the lower valve gasket and the sealing ring is provided on one side of the sealing ring close to the lower valve gasket.

[0015] By adopting the above technical solution, the sealing effect can be further enhanced.

[0016] Optionally, the sealing ring includes an outer ring and an inner cylinder which are coaxially arranged, the diaphragm is fixedly connected to the outer ring, the upper valve pad is fixedly connected to one end of the inner cylinder close to the diaphragm, the lower valve pad is fixedly connected to one end of the inner cylinder away from the diaphragm, the outer ring is slidably mounted on the outer wall of the inner cylinder along its own axial direction, and a limiting ring is coaxially fixedly connected to the outer wall of the inner cylinder for resisting against the outer ring.

[0017] By adopting the above technical scheme, the sealing ring includes an outer ring and an inner cylinder. When the upper valve gasket is damaged after working for a long time, the valve body can be removed from the valve cover, and then the sealing assembly can be taken out, and the outer ring and the inner cylinder can be separated, and a new inner cylinder can be replaced, and the original outer ring can be retained, that is, when the upper valve gasket is damaged, only the inner cylinder with the upper valve gasket installed can be replaced; similarly, when the diaphragm is damaged, only the outer ring with the diaphragm installed can be replaced; therefore, the separate setting of the outer ring and the inner cylinder can reduce the parts that need to be replaced after a problem occurs, further reducing the maintenance cost.

[0018] In a second aspect, the present application provides a diaphragm valve, which adopts the following technical solution: A diaphragm valve comprises a valve body and the above-mentioned replaceable diaphragm sealing assembly structure, wherein the outer ring is arranged in the valve body, and the limit ring is arranged on the outer wall of the inner cylinder in the center along the axial direction of the inner cylinder.

[0019] By adopting the above technical solution, the limiting ring is centrally arranged on the outer wall of the inner cylinder, so that the inner cylinder has a vertically symmetrical structure, that is, the inner cylinder can be installed in a forward direction, so that the upper valve pad is located on the side close to the diaphragm, and the lower valve pad is located on the side away from the diaphragm. The inner cylinder can also be installed in a reverse direction, so that the lower valve pad is located on the side close to the diaphragm, and the upper valve pad is located on the side away from the diaphragm. In actual working process, when the diaphragm and the upper valve pad are arranged at intervals, the diaphragm valve is in an open state, and the medium can flow through the gap between the diaphragm and the upper valve pad, so the upper valve pad will be in direct contact with the medium. After working for a long time, impurities in the medium will adhere to the upper valve pad, and then the downward pressure process of the diaphragm will easily cause the surface of the upper valve pad to be damaged; while the lower valve pad is arranged between the inner cylinder and the valve body, during normal operation, the lower valve pad will block the gap between the inner cylinder and the valve body, so the medium cannot flow out from the gap between the inner cylinder and the valve body, that is, it is difficult for the medium to directly contact the lower surface of the lower valve pad, and the surface of the lower valve pad is not easy to adhere to impurities or be corroded; furthermore, the lower valve pad will not be directly affected by the pressure of the diaphragm, so after working for the same long time, when the upper valve pad is damaged, the lower surface of the lower valve pad is not easy to be damaged, and the lower valve pad can still maintain a good sealing effect; At this time, the valve body can be removed from the valve cover, and then the inner cylinder can be taken out and installed in reverse, that is, the lower valve gasket with an intact surface is on the side close to the diaphragm, and the upper valve gasket with a damaged surface is on the side away from the diaphragm. At this time, a good sealing effect can still be maintained between the lower valve gasket and the diaphragm. Therefore, there is no need to replace the inner cylinder, only the installation method needs to be changed to solve the leakage problem, which further extends the service life of the sealing component and can further reduce the maintenance cost.

[0020] Optionally, both ends of the inner cylinder are provided with accommodating grooves, and a sealing member for abutting against the inner wall of the accommodating groove is fixedly provided on one side of the valve body close to the inner cylinder.

[0021] By adopting the above technical solution, the sealing member abuts against the inner wall of the accommodating groove, thereby enhancing the sealing effect of the connection between the inner tube and the valve body, making the lower valve gasket less likely to contact the medium, further reducing the possibility of damage to the lower valve gasket installed on the side away from the diaphragm. The subsequent reverse installation of the inner tube helps to ensure the sealing effect between the lower valve gasket and the diaphragm, and can extend the service life of the lower valve gasket after the reverse installation; when the surface of the upper valve gasket is damaged and the inner tube is reversely installed, the sealing member can work together with the damaged upper valve gasket to perform a sealing function, thereby ensuring the sealing effect between the inner tube and the valve body and reducing the possibility of leakage here.

[0022] Optionally, the sealing member includes an inner sealing ring and an outer sealing ring, wherein the inner sealing ring is coaxially arranged on the inner side of the lower valve pad, and the outer sealing ring is coaxially arranged on the outer side of the lower valve pad.

[0023] By adopting the above technical solution, the sealing member is two coaxially arranged sealing rings, and the two sealing rings are respectively located on the inner and outer sides of the lower valve pad, thereby helping to further enhance the sealing effect of the connection between the inner tube and the valve body.

[0024] Optionally, the cross sections of the inner sealing ring and the outer sealing ring are both sharp-shaped on the side away from the valve body.

[0025] By adopting the above technical solution, after tightening the valve body, the sharp end faces of the inner sealing ring and the outer sealing ring can be pressed tightly against the corresponding receiving grooves, which helps to enhance the sealing effect.

[0026] Optionally, a flexible pad for abutting against the inner sealing ring or the outer sealing ring is provided in the accommodating groove.

[0027] The adoption of the above technical solution helps to further enhance the sealing effect.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The design of the sealing assembly and the valve body is separated, so when the upper valve pad is damaged, only the sealing assembly needs to be replaced without replacing the valve body, which helps to reduce maintenance costs.

[0029] 2. The sealing ring consists of a separate outer ring and an inner cylinder. When the diaphragm fixedly installed on the outer ring or the upper valve pad fixedly installed on the inner cylinder is damaged, only the outer ring or the inner cylinder needs to be replaced, which further reduces the maintenance cost.

[0030] 3. The limit ring on the outer wall of the inner cylinder is set in the center, so that the inner cylinder has a symmetrical structure up and down, so the inner cylinder can be installed in the forward direction or in the reverse direction. When the upper valve pad is damaged after the diaphragm valve is used for a long time, the lower valve pad does not directly contact with the medium or has less contact with the medium, so the surface quality of the lower valve pad remains good. At this time, the inner cylinder with the upper valve pad and the lower valve pad is installed in reverse, and the upper valve pad originally matched with the diaphragm can be replaced with the lower valve pad, thereby ensuring the sealing effect at the diaphragm. That is, there is no need to replace the inner cylinder, only the installation method needs to be changed to solve the leakage problem caused by the damage of the upper valve pad, which helps to extend the service life of the sealing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A cross-sectional view of a diaphragm valve in the related art; Figure 2 is a cross-sectional view of Example 1 of the present application for illustrating the installation position of the sealing assembly; Figure 3 is a cross-sectional view of the sealing assembly in Example 1 of the present application; Figure 4 is a cross-sectional view of the sealing assembly in Example 2 of the present application; Figure 5 is a cross-sectional view of Example 3 of the present application; Figure 6 yes Figure 5 A magnified schematic diagram of center A.

[0032] Figure numerals: 1. Valve cover; 11. Mounting hole; 2. Valve stem; 3. Valve body; 31. Interface; 32. Inlet channel; 33. Outlet channel; 4. Diaphragm; 5. Valve gasket; 6. Sealing ring; 61. Center hole; 62. Annular groove; 63. Connecting hole; 64. Mounting groove; 7. Upper valve gasket; 8. Lower valve gasket; 9. Outer ring; 10. Inner cylinder; 101. Limiting ring; 102. Accommodating groove; 12. Inner sealing ring; 13. Outer sealing ring; 14. Flexible gasket. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] Example 1 The present application discloses a replaceable diaphragm seal assembly structure, which is described by taking its application in a diaphragm valve as an example. Figure 2 The diaphragm valve includes a valve cover 1, a valve stem 2 and a valve body 3. A mounting hole 11 is provided at one end of the valve cover 1, and an internal thread is provided on the inner wall of the mounting hole 11. The valve stem 2 is slidably provided in the valve cover 1, and one end of the valve stem 2 is located in the mounting hole 11. The valve body 3 is provided at one end of the valve cover 1 where the mounting hole 11 is located, and an interface 31 is fixedly connected to the valve body 3, and an external thread is provided on the outer wall of the interface 31; the interface 31 of the valve body 3 is threadedly connected to the mounting hole 11 of the valve cover 1, thereby connecting the valve body 3 and the valve cover 1. An inlet channel 32 and an outlet channel 33 are provided inside the valve body 3, and the end of the inlet channel 32 and the starting end of the outlet channel 33 are both facing the valve stem 2.

[0035] Reference Figure 2 and Figure 3 The replaceable diaphragm seal assembly structure includes a seal ring 6, an upper valve pad 7 and a diaphragm 4. The seal ring 6 is an annular structure, and a central hole 61 is coaxially provided on the seal ring 6. An annular groove 62 is coaxially provided on both the upper and lower sides of the seal ring 6, and the annular groove 62 is located outside the central hole 61. The seal ring 6 is also provided with a connecting hole 63, which is a circular hole, and the axis of the connecting hole 63 is parallel to the axis of the seal ring 6; the two ends of the connecting hole 63 are respectively connected to the annular grooves 62 on both sides; there are multiple connecting holes 63, and they are arranged in a circular array.

[0036] A mounting groove 64 is coaxially formed on one side of the sealing ring 6, and the mounting groove 64 is located between the central hole 61 and the annular groove 62. The upper valve pad 7 is arranged in the mounting groove 64, and the upper valve pad 7 and the inner wall of the mounting groove 64 are fixed by riveting; the upper valve pad 7 is made of plastic.

[0037] The diaphragm 4 is arranged on one side of the sealing ring 6 close to the upper valve pad 7, and the edge of the diaphragm 4 and the edge of the sealing ring 6 are fixedly connected together by laser welding. The diaphragm 4 is made of elastic material, and under normal conditions, the diaphragm 4 and the upper valve pad 7 are arranged at intervals.

[0038] The upper valve pad 7 and the diaphragm 4 are fixedly connected to the sealing ring 6, so the upper valve pad 7, the diaphragm 4 and the sealing ring 6 can form a sealing assembly as a whole. During installation, the sealing assembly can be placed inside the interface 31 of the valve body 3, and then the interface 31 of the valve body 3 and the mounting hole 11 of the valve cover 1 are aligned, and the valve body 3 is rotated so that the interface 31 of the valve body 3 and the mounting hole 11 of the valve cover 1 are threadedly connected; after the valve body 3 is tightened, the sealing assembly can be located between the valve body 3 and the valve cover 1, and the diaphragm 4 and the end of the valve stem 2 are butted.

[0039] When the valve stem 2 slides toward the side close to the valve body 3, the valve stem 2 can push the middle part of the diaphragm 4 downward, so that the diaphragm 4 is deformed after being compressed, until the diaphragm 4 is pressed against the upper valve pad 7, so that the inlet channel 32 is closed, and the inlet channel 32 and the outlet channel 33 are not connected at this time, and the diaphragm valve is closed. When the valve stem 2 slides toward the side away from the valve body 3, the deformed diaphragm 4 can be restored to its original state, so that the diaphragm 4 and the upper valve pad 7 are separated, and the inlet channel 32 and the outlet channel 33 are connected to each other, so that the medium flowing in from the inlet channel 32 can flow into the outlet channel 33, and the diaphragm valve is opened.

[0040] Furthermore, a mounting groove 64 is also provided on the sealing ring 6 at a side away from the upper valve pad 7, and a lower valve pad 8 is riveted and fixed in the mounting groove 64. The lower valve pad 8 has the same structure as the upper valve pad 7, and the lower valve pad 8 is also made of plastic. Therefore, after the sealing assembly is installed, the side of the lower valve pad 8 away from the sealing ring 6 can be abutted against the valve body 3, thereby enhancing the seal between the sealing ring 6 and the valve body 3.

[0041] A gasket is also provided on one side of the sealing ring 6 close to the lower valve pad 8 . The gasket is made of metal and is arranged between the sealing ring 6 and the valve body 3 . Thus, the gasket can further enhance the sealing between the sealing ring 6 and the valve body 3 .

[0042] The implementation principle of Example 1 is as follows: install the gasket and the sealing assembly into the interface 31 of the valve body 3 in sequence, then align the interface 31 of the valve body 3 with the mounting hole 11 of the valve cover 1, screw the valve body 3 onto the valve cover 1, so that the valve body 3 and the valve cover 1 are threadedly connected; after tightening the valve body 3, the side of the diaphragm 4 away from the upper valve pad 7 can be abutted against the end of the valve stem 2, thereby completing the installation of the diaphragm valve, and the diaphragm valve can work normally. When the upper valve pad 7 is damaged and causes leakage, the valve body 3 can be unscrewed, and then the sealing assembly can be taken out of the valve body 3, and a new sealing assembly can be installed in the valve body 3, and then the valve body 3 and the valve cover 1 can be connected to complete the replacement process of the upper valve pad 7. Since only the sealing assembly needs to be replaced, the original valve body 3 can continue to be used, which helps to reduce maintenance costs.

[0043] Example 2 Reference Figure 4 , the difference between this embodiment and embodiment 1 is that the sealing ring 6 in this embodiment includes an outer ring 9 and an inner cylinder 10. The center hole 61 is provided on the inner cylinder 10, and the mounting grooves 64 are provided at both ends of the inner cylinder 10; the connecting hole 63 is provided on the outer ring 9, and the annular groove 62 is formed between the outer ring 9 and the inner cylinder 10. The outer ring 9 is coaxially sleeved on the outer wall of the inner cylinder 10, and the inner diameter of the outer ring 9 is the same as the outer diameter of the inner cylinder 10, so that the outer ring 9 and the inner cylinder 10 can slide relative to each other, so that the outer ring 9 and the inner cylinder 10 are a separate structure. A limiting ring 101 is coaxially fixedly connected to the outer wall of the inner cylinder 10, and the outer diameter of the limiting ring 101 is larger than the inner diameter of the outer ring 9, so that after installation, under the action of the valve body 3, the limiting ring 101 can be pressed against the outer ring 9, so that the outer ring 9 and the inner cylinder 10 are tightly matched.

[0044] The edge of the diaphragm 4 and the edge of one side of the outer ring 9 are fixed together by laser welding; mounting grooves 64 are provided at both ends of the inner tube 10, and an upper valve gasket 7 is riveted into the mounting groove 64 at one end of the inner tube 10 close to the diaphragm 4, and a lower valve gasket 8 is riveted into the mounting groove 64 at one end of the inner tube 10 away from the diaphragm 4.

[0045] During installation, first install the gasket into the interface 31 of the valve body 3, then install the inner cylinder 10 into the interface 31 of the valve body 3, and then install the outer ring 9 into the interface 31 of the valve body 3; then screw the valve body 3 onto the valve cover 1, thereby completing the connection between the valve body 3 and the valve cover 1, and completing the installation of the diaphragm valve. When the upper valve gasket 7 is damaged, the valve body 3 can be unscrewed from the valve cover 1, and then the outer ring 9 and the inner cylinder 10 can be taken out of the valve body 3. At this time, only the inner cylinder 10 with the upper valve gasket 7 and the lower valve gasket 8 installed needs to be replaced, and then the above process can be repeated to complete the installation of the diaphragm valve; the separate setting of the outer ring 9 and the inner cylinder 10 allows maintenance to be completed by replacing only the inner cylinder 10, thereby further reducing the maintenance cost.

[0046] Example 3 Reference Figure 5 and Figure 6 This embodiment discloses a diaphragm valve, including a valve cover 1, a valve stem 2, a valve body 3 and a sealing assembly. The valve cover 1, the valve stem 2 and the valve body 3 have the same structure as in Embodiment 1, and are not described in detail here. The sealing assembly includes a sealing ring 6, an upper valve pad 7, a lower valve pad 8 and a diaphragm 4. The structure of the sealing assembly is the same as that in Embodiment 2, and is not described in detail here.

[0047] Furthermore, the limiting ring 101 is centrally arranged on the outer wall of the inner cylinder 10 along the axial direction of the inner cylinder 10 , so that the inner cylinder 10 has a vertically symmetrical structure, and thus the inner cylinder 10 can be installed in both forward and reverse directions.

[0048] After the diaphragm valve is installed, the sealing assembly is located between the valve body 3 and the valve cover 1, and the upper valve pad 7 is located on the side close to the diaphragm 4. The upper valve pad 7 can directly contact the circulating medium, so after long-term work, the surface of the upper valve pad 7 is more easily damaged. The lower valve pad 8 is located on the side away from the diaphragm 4, and the lower valve pad 8 is located between the inner cylinder 10 and the valve body 3, so the lower valve pad 8 is not easy to directly contact the circulating medium. Under the same working time, the surface quality of the lower valve pad 8 is better maintained. Therefore, when the upper valve pad 7 is damaged due to long-term work, the sealing assembly can be taken out, and then the inner cylinder 10 is reversely installed and reinstalled; at this time, the lower valve pad 8 is on the side close to the diaphragm 4, and the upper valve pad 7 is on the side away from the diaphragm 4, so the leakage problem of the diaphragm valve can be improved without replacing parts, which helps to extend the service life of the sealing assembly.

[0049] Reference Figure 6 , further, a sealing member is fixedly connected to one side of the valve body 3 close to the inner tube 10, and the sealing member includes an inner sealing ring 12 and an outer sealing ring 13. The inner sealing ring 12 is coaxially arranged on the outer side of the terminal opening of the inlet channel 32, and the outer sealing ring 13 is coaxially arranged on the outer side of the inner sealing ring 12; and the inner sealing ring 12 and the outer sealing ring 13 are respectively located on both sides of the lower valve pad 8. Correspondingly, both ends of the inner tube 10 are provided with a receiving groove 102, and each end of the inner tube 10 is provided with two receiving grooves 102, and the two receiving grooves 102 at the same end of the inner tube 10 correspond to the inner sealing ring 12 and the outer sealing ring 13 respectively. Therefore, after the valve body 3 is screwed on the valve cover 1, the inner sealing ring 12 and the outer sealing ring 13 can be pressed against the inner wall of the corresponding receiving groove 102, thereby further enhancing the sealing effect of the connection between the inner tube 10 and the valve body 3.

[0050] The cross-sections of the inner sealing ring 12 and the outer sealing ring 13 are both triangular in shape on the side away from the valve body 3, and the cross-section shape of the accommodating groove 102 is adapted to the cross-section shapes of the inner sealing ring 12 and the outer sealing ring 13, thereby further enhancing the sealing effect.

[0051] In addition, a flexible pad 14 is bonded in the receiving groove 102 . The flexible pad 14 is made of rubber material, thus helping to enhance the sealing effect.

[0052] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A replaceable diaphragm seal assembly structure, characterized in that: include: A sealing ring (6), wherein the sealing ring (6) is provided with a central hole (61) extending therethrough, annular grooves (62) are provided on both sides of the sealing ring (6), the annular grooves (62) are located outside the central hole (61), and the sealing ring (6) is provided with a connecting hole (63) for connecting the two annular grooves (62) to each other, so that a medium in one of the annular grooves (62) can flow into the other annular groove (62) through the connecting hole (63); An upper valve pad (7), the upper valve pad (7) being fixedly arranged on one side of the sealing ring (6), and the upper valve pad (7) being located outside the central hole (61); A diaphragm (4), the diaphragm (4) being arranged on a side of the sealing ring (6) close to the upper valve pad (7), the edge of the diaphragm (4) being fixedly connected to the sealing ring (6), and the diaphragm (4) being elastic so that the diaphragm (4) can abut against the upper valve pad (7) after being subjected to force.

2. A replaceable diaphragm seal assembly structure according to claim 1, characterized in that: A plurality of the connection holes (63) are provided and arranged in a circular array.

3. The replaceable diaphragm seal assembly structure according to claim 1, characterized in that: A lower valve pad (8) is fixedly connected to the sealing ring (6) at a side away from the upper valve pad (7).

4. A replaceable diaphragm seal assembly structure according to claim 3, characterized in that: A gasket for abutting against the lower valve pad (8) and the sealing ring (6) is provided on one side of the sealing ring (6) close to the lower valve pad (8).

5. The replaceable diaphragm seal assembly structure according to claim 3, characterized in that: The sealing ring (6) comprises an outer ring (9) and an inner tube (10) which are coaxially arranged, the diaphragm (4) is fixedly connected to the outer ring (9), the upper valve pad (7) is fixedly connected to one end of the inner tube (10) close to the diaphragm (4), and the lower valve pad (8) is fixedly connected to one end of the inner tube (10) away from the diaphragm (4). The outer ring (9) is slidably sleeved on the outer wall of the inner tube (10) along its own axial direction, and a limit ring (101) for abutting against the outer ring (9) is coaxially fixedly connected to the outer wall of the inner tube (10).

6. A diaphragm valve, comprising a valve body (3), characterized in that: It also includes a replaceable diaphragm (4) sealing assembly structure as claimed in claim 5, wherein the outer ring (9) is arranged in the valve body (3), and the limit ring (101) is arranged on the outer wall of the inner tube (10) in the center along the axial direction of the inner tube (10).

7. A diaphragm valve according to claim 6, characterized in that: Both ends of the inner cylinder (10) are provided with receiving grooves (102), and a sealing member for abutting against the inner wall of the receiving groove (102) is fixedly provided on one side of the valve body (3) close to the inner cylinder (10).

8. A diaphragm valve according to claim 7, characterized in that: The sealing member comprises an inner sealing ring (12) and an outer sealing ring (13); the inner sealing ring (12) is coaxially arranged on the inner side of the lower valve pad (8), and the outer sealing ring (13) is coaxially arranged on the outer side of the lower valve pad (8).

9. A diaphragm valve according to claim 8, characterized in that: The cross sections of the inner sealing ring (12) and the outer sealing ring (13) are both sharp-shaped on the side away from the valve body (3).

10. A diaphragm valve according to claim 8, characterized in that: A flexible pad (14) is provided in the receiving groove (102) for abutting against the inner sealing ring (12) or the outer sealing ring (13).

Images