A replaceable diaphragm seal assembly structure and diaphragm valve

Abstract

The application relates to the technical field of diaphragm valves, and particularly discloses a replaceable diaphragm sealing assembly structure and a diaphragm valve, which comprises a sealing ring, a center hole is arranged through the sealing ring, annular grooves are arranged on the two sides of the sealing ring, the annular grooves are located outside the center hole, a connecting hole is arranged on the sealing ring and used for connecting the two annular grooves, so that medium in one of the annular grooves can flow into the other annular groove through the connecting hole, an upper valve pad is fixedly arranged on one side of the sealing ring and located outside the center hole, and a diaphragm is arranged on the side of the sealing ring close to the upper valve pad, the edge of the diaphragm is fixedly connected with the sealing ring, and the diaphragm is elastic so that the diaphragm can abut against the upper valve pad after being stressed. The application can replace the valve pad while retaining the valve body.

Description

TECHNICAL FIELD

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

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

[0003] REFERENCE Figure 1 The diaphragm valve comprises a valve cover 1, a valve rod 2, a valve body 3, a diaphragm 4 and a valve pad 5. The valve cover 1 is provided with a mounting hole 11 at one end, and the inner wall of the mounting hole 11 is provided with an internal thread. The valve rod 2 is slidingly arranged in the valve cover 1, and one end of the valve rod 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 rod 2. The valve body 3 is provided with a joint 31, and the outer wall of the joint 31 is provided with an external thread. The joint 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. The inside of the valve body 3 is provided with an inlet channel 32 and an outlet channel 33. The end of the inlet channel 32 and the start 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. The valve pad 5 can abut against the diaphragm 4.

[0004] When the valve rod 2 slides towards the side close to the valve body 3, the diaphragm 4 is forced to bend downwards and abut against the valve pad 5, so that the inlet channel 32 and the outlet channel 33 are closed, and the flow of the medium is blocked. When the valve rod 2 reversely slides, the diaphragm 4 returns to the original state, the diaphragm 4 is separated from the valve pad 5, so that the inlet channel 32 and the outlet channel 33 are connected, and thus 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, the gas or liquid can flow through the gap between the diaphragm 4 and the valve pad 5. The 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 pushing the diaphragm 4 downwards by the valve rod 2 is easy to cause the surface of the valve pad 5 close to the diaphragm 4 to be damaged, such as surface scratches. The damage of the valve pad 5 will affect the close cooperation between the valve pad 5 and the diaphragm 4, thereby causing a leakage problem. 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 pad 5 is riveted and fixed on the valve body 3, the valve pad 5 and the valve body 3 are tightly matched, so that the user is difficult to disassemble and replace the valve pad 5, and thus the assembly of the valve pad 5 and the valve body 3 needs to be replaced as a whole to solve the leakage problem. However, since the valve body 3 has a high manufacturing cost, a solution is needed to solve the leakage problem without replacing the assembly as a whole. SUMMARY

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

[0008] In a first aspect, the application provides a replaceable diaphragm sealing assembly structure, which adopts the following technical solution:

[0009] A replaceable diaphragm sealing assembly structure comprises:

[0010] A sealing ring, a center hole is provided through the sealing ring, and annular grooves are provided on both sides of the sealing ring, the annular grooves are located outside the center hole, and a connecting hole is provided on the sealing ring to connect 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;

[0011] 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 center hole;

[0012] A diaphragm, the diaphragm is arranged on one side of the sealing ring close to the upper valve pad, 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.

[0013] By adopting the above technical solution, when the upper valve pad needs to be replaced due to serious wear, the sealing assembly can be directly taken out from the valve body, and then a new sealing assembly can be replaced, so that the leakage problem caused by damage of the upper valve pad can be solved without replacing the valve body, thereby reducing the maintenance cost and solving the problem that the traditional riveted valve pad is not easy to disassemble and replace from the valve body.

[0014] Optionally, the connecting hole is provided with a plurality of circumferential array arrangements.

[0015] By adopting the 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 one annular groove to the other annular groove through the connecting hole; since the connecting hole is provided with multiple connecting holes, the connecting part between the two annular grooves is larger, which helps to reduce the pressure loss in the medium flow process; in the scheme, the two annular grooves are connected to each other through the connecting hole, so that even if the sealing assembly is rotated after being installed and tightened in the valve body, and 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, thereby helping to ensure smooth flow of the medium.

[0016] Optionally, the sealing ring is fixedly connected with the lower valve pad on the side away from the upper valve pad.

[0017] By adopting the technical scheme, the lower valve pad abuts against the sealing ring and the valve body, so that the sealing effect between the sealing ring and the valve body can be enhanced, and the possibility of leakage at this position can be reduced, thereby ensuring normal use of the diaphragm valve.

[0018] Optionally, the side of the sealing ring close to the lower valve pad is provided with a gasket for abutting against the lower valve pad and the sealing ring.

[0019] By adopting the technical scheme, the sealing effect can be further enhanced.

[0020] Optionally, the sealing ring comprises an outer ring and an inner cylinder 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 sleeved on the outer wall of the inner cylinder along the axis direction of the outer ring, and the limiting ring is coaxially fixedly connected to the outer wall of the inner cylinder for abutting against the outer ring.

[0021] By adopting the technical scheme, the sealing ring comprises an outer ring and an inner cylinder, when the upper valve pad is damaged after long-time work, the valve body can be disassembled from the valve cover, then the sealing assembly is taken out, and the outer ring and the inner cylinder are separated, and a new inner cylinder can be replaced, the original outer ring can be retained, that is, when the upper valve pad is damaged, only the inner cylinder on which the upper valve pad is installed needs to be replaced; similarly, when the diaphragm is damaged, only the outer ring on which the diaphragm is installed needs to be replaced; therefore, the separate arrangement of the outer ring and the inner cylinder can reduce the parts that need to be replaced when problems occur, and further reduce the maintenance cost.

[0022] In the second aspect, the application provides a diaphragm valve, which adopts the following technical scheme:

[0023] A diaphragm valve comprises a valve body, and further comprises the replaceable diaphragm sealing assembly structure, the outer ring is arranged in the valve body, and the limiting ring is arranged on the outer wall of the inner cylinder in the axis direction of the inner cylinder.

[0024] By adopting the above technical solution, the limiting ring is centrally located on the outer wall of the inner cylinder, thus making the inner cylinder a symmetrical structure. That is, the inner cylinder can be installed in the forward direction, so that the upper valve pad is located on the side closer to the diaphragm and the lower valve pad is located on the side farther away from the diaphragm. The inner cylinder can also be installed in the reverse direction, so that the lower valve pad is located on the side closer to the diaphragm and the upper valve pad is located on the side farther away from the diaphragm.

[0025] In actual operation, when the diaphragm and the upper valve gasket are spaced apart, the diaphragm valve is in the open state, and the medium can flow through the gap between the diaphragm and the upper valve gasket. Therefore, the upper valve gasket will be in direct contact with the medium. After long-term operation, impurities in the medium will adhere to the upper valve gasket, and the downward pressure of the diaphragm can easily cause damage to the surface of the upper valve gasket. On the other hand, the lower valve gasket is located between the inner cylinder and the valve body. During normal operation, the lower valve gasket will block the gap between the inner cylinder and the valve body, so the medium cannot flow out through the gap between the inner cylinder and the valve body. That is, the medium is unlikely to come into direct contact with the lower surface of the lower valve gasket, and the surface of the lower valve gasket is not easily subject to impurities or corrosion. Furthermore, the lower valve gasket is not directly subjected to the pressure of the diaphragm. Therefore, after the same period of operation, when the upper valve gasket is damaged, the lower surface of the lower valve gasket is not easily damaged, and the lower valve gasket can still maintain a better sealing effect.

[0026] At this point, the valve body can be removed from the valve cover, and then the inner cylinder can be removed and installed in reverse. This ensures that the undamaged lower valve gasket is on the side closer to the diaphragm, while the damaged upper valve gasket is on the side farther from the diaphragm. In this case, the lower valve gasket and the diaphragm can still maintain a good sealing effect. Therefore, there is no need to replace the inner cylinder; simply changing the installation method can solve the leakage problem, further extending the service life of the sealing components and further reducing maintenance costs.

[0027] Optionally, both ends of the inner cylinder are provided with receiving grooves, and a sealing element for abutting against the inner wall of the receiving groove is fixedly provided on the side of the valve body near the inner cylinder.

[0028] By adopting the above technical solution, the sealing element abuts against the inner wall of the receiving groove, thus enhancing the sealing effect at the connection between the inner cylinder and the valve body. This makes it less likely for the lower valve gasket to come into contact with the medium, further reducing the possibility of damage to the lower valve gasket installed on the side away from the diaphragm. Subsequently, reversing the inner cylinder 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 reversing the installation. When the surface of the upper valve gasket is damaged and the inner cylinder is reversed, the sealing element can work together with the damaged upper valve gasket to provide a sealing effect, thereby ensuring the sealing effect between the inner cylinder and the valve body and reducing the possibility of leakage at this point.

[0029] Optionally, the sealing member comprises an inner sealing ring and an outer sealing ring, 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.

[0030] By adopting the technical scheme, the sealing member comprises two coaxially arranged sealing rings, and the two sealing rings are arranged on the inner and outer sides of the lower valve pad, so that the sealing effect of the connection between the inner cylinder and the valve body is further enhanced.

[0031] Optionally, the cross section of the inner sealing ring and the outer sealing ring is arranged in a sharp shape on the side away from the valve body.

[0032] By adopting the technical scheme, after the valve body is screwed, the end faces of the inner sealing ring and the outer sealing ring in sharp shape are abutted in the corresponding accommodating grooves, so that the sealing effect is enhanced.

[0033] Optionally, the accommodating groove is provided with a flexible pad for abutting against the inner sealing ring or the outer sealing ring.

[0034] By adopting the technical scheme, the sealing effect is further enhanced.

[0035] In summary, the present application has at least one of the following beneficial technical effects:

[0036] 1. The sealing assembly and the valve body are separated, so that when the upper valve pad is damaged, only the sealing assembly needs to be replaced, without replacing the valve body, so that the maintenance cost is reduced.

[0037] 2. The sealing ring is composed of two parts of the outer ring and the inner cylinder, and 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, further reducing the maintenance cost.

[0038] 3. The limiting ring on the outer wall of the inner cylinder is centrally arranged, so that the inner cylinder has an upper-lower symmetrical structure, and the inner cylinder can be installed in a forward direction or a reverse direction. When the diaphragm valve is used for a long time, the upper valve pad is damaged, the lower valve pad is not directly contacted with the medium or less contacted with the medium, and the surface quality of the lower valve pad is good. At this time, the inner cylinder with the upper valve pad and the lower valve pad is installed in a reverse direction, the upper valve pad originally matched with the diaphragm is replaced by the lower valve pad, so that the sealing effect of the diaphragm is ensured, that is, the leakage problem caused by the damage of the upper valve pad can be solved by replacing the installation mode without replacing the inner cylinder, so that the service life of the sealing assembly is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A sectional view of a diaphragm valve in the related art;

[0040] Figure 2is a sectional view of the sealing assembly installation position of the embodiment 1 of the present application;

[0041] Figure 3 is a sectional view of the sealing assembly in the embodiment 1 of the present application;

[0042] Figure 4 is a sectional view of the sealing assembly in the embodiment 2 of the present application;

[0043] Figure 5 is a sectional view of the embodiment 3 of the present application;

[0044] Figure 6 is Figure 5 is an enlarged schematic view at A in FIG. 1.

[0045] Reference signs: 1, valve cover; 11, installation hole; 2, valve stem; 3, valve body; 31, interface; 32, inlet channel; 33, outlet channel; 4, diaphragm; 5, valve gasket; 6, sealing ring; 61, central hole; 62, annular groove; 63, connecting hole; 64, installation 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 pad. DETAILED DESCRIPTION

[0046] The following will be described in detail in combination with the accompanying drawings. Figures 1-6 The present application is further described in detail.

[0047] Embodiment 1

[0048] The embodiment of the present application discloses a replaceable diaphragm sealing assembly structure, which is applied to a diaphragm valve as an example for description. Referring to Figure 2 , the diaphragm valve comprises a valve cover 1, a valve stem 2 and a valve body 3. An installation hole 11 is formed in one end of the valve cover 1, and an inner thread is arranged on the inner wall of the installation hole 11. The valve stem 2 is slidingly arranged in the valve cover 1, and one end of the valve stem 2 is located in the installation hole 11. The valve body 3 is arranged at the end of the valve cover 1 where the installation hole 11 is located, and the valve body 3 is fixedly connected with an interface 31, and an outer thread is arranged on the outer wall of the interface 31; the interface 31 of the valve body 3 and the installation hole 11 of the valve cover 1 are threadedly connected, so as to connect the valve body 3 and the valve cover 1. The inside of the valve body 3 is formed with an inlet channel 32 and an outlet channel 33, and the end of the inlet channel 32 and the starting end of the outlet channel 33 are both directed towards the valve stem 2.

[0049] Referring to Figure 2 and Figure 3The replaceable diaphragm sealing assembly structure comprises a sealing ring 6, an upper valve pad 7 and a diaphragm 4. The sealing ring 6 is in a circular ring structure, and a through central hole 61 is coaxially arranged on the sealing ring 6. The upper and lower sides of the sealing ring 6 are coaxially provided with annular grooves 62, which are located outside the central hole 61. The sealing ring 6 is also provided with connecting holes 63, which are circular holes, and the axes of the connecting holes 63 are parallel to the axis of the sealing ring 6; the two ends of the connecting holes 63 are respectively connected with the annular grooves 62 on both sides; the connecting holes 63 are arranged in a circumferential array.

[0050] A mounting groove 64 is coaxially arranged 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 is fixedly connected with the inner wall of the mounting groove 64 by riveting; the upper valve pad 7 is made of plastic material.

[0051] 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 a material with elasticity, and the diaphragm 4 and the upper valve pad 7 are arranged in a spaced manner in a normal state.

[0052] The upper valve pad 7 and the diaphragm 4 are fixedly connected to the sealing ring 6, so that the upper valve pad 7, the diaphragm 4 and the sealing ring 6 can form a sealing assembly whole. During installation, the sealing assembly can be placed in the interface 31 of the valve body 3 first, 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 to make the interface 31 of the valve body 3 and the mounting hole 11 of the valve cover 1 threadedly connected; after the valve body 3 is tightened, the sealing assembly is located between the valve body 3 and the valve cover 1, and the diaphragm 4 abuts against the end of the valve stem 2.

[0053] When the valve stem 2 slides towards the side close to the valve body 3, the valve stem 2 can push the middle part of the diaphragm 4 to move downward, so that the diaphragm 4 is deformed after being pressed until the diaphragm 4 abuts against the upper valve pad 7, thereby making the inlet passage 32 closed, and the inlet passage 32 and the outlet passage 33 are in a disconnected state, and the diaphragm valve is closed. When the valve stem 2 slides away from the valve body 3, the deformed diaphragm 4 can restore to the original state, so that the diaphragm 4 and the upper valve pad 7 are in a separated state, and the inlet passage 32 and the outlet passage 33 are in a connected state, so that the medium flowing from the inlet passage 32 can flow into the outlet passage 33, and the diaphragm valve is opened.

[0054] Further, a mounting groove 64 is also arranged on the side of the sealing ring 6 away from the upper valve pad 7, and a lower valve pad 8 is fixedly connected in the mounting groove 64 by riveting, and 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 material. Therefore, after the installation of the sealing assembly is completed, the side of the lower valve pad 8 away from the sealing ring 6 can abut against the valve body 3, thereby enhancing the sealing between the sealing ring 6 and the valve body 3.

[0055] The sealing ring 6 is also provided with a gasket on the side close to the lower valve gasket 8. The gasket is made of metal and is arranged between the sealing ring 6 and the valve body 3, so that the gasket can further enhance the sealing between the sealing ring 6 and the valve body 3.

[0056] The implementation principle of the embodiment 1 is that the gasket and the sealing assembly are sequentially arranged in the interface 31 of the valve body 3, then the interface 31 of the valve body 3 and the mounting hole 11 of the valve cover 1 are aligned, the valve body 3 is screwed into the valve cover 1, so that the valve body 3 and the valve cover 1 are threadedly connected; after the valve body 3 is screwed, the side of the diaphragm 4 away from the upper valve gasket 7 abuts against the end of the valve stem 2, so that the installation of the diaphragm valve is completed and the diaphragm valve can normally work. When the upper valve gasket 7 is damaged and leakage occurs, the valve body 3 is unscrewed, then the sealing assembly is taken out of the valve body 3, a new sealing assembly is arranged in the valve body 3, and then the valve body 3 and the valve cover 1 are connected, so that the replacement process of the upper valve gasket 7 is completed. Since only the sealing assembly needs to be replaced, the original valve body 3 can continue to be used, so that the maintenance cost is reduced.

[0057] Embodiment 2

[0058] With reference to Figure 4 The difference between the embodiment and the embodiment 1 is that the sealing ring 6 in the embodiment comprises an outer ring 9 and an inner cylinder 10. The center hole 61 is arranged on the inner cylinder 10, and the mounting groove 64 is arranged at both ends of the inner cylinder 10; the connecting hole 63 is arranged 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, and the outer ring 9 and the inner cylinder 10 are a separated structure. The limiting ring 101 is fixedly connected to the outer wall of the inner cylinder 10 in a coaxial manner, and the outer diameter of the limiting ring 101 is greater than the inner diameter of the outer ring 9, so that after installation, the limiting ring 101 can be tightly abutted against the outer ring 9 under the action of the valve body 3, so that the outer ring 9 and the inner cylinder 10 are tightly matched.

[0059] The edge of the diaphragm 4 and the edge on one side of the outer ring 9 are fixed together by laser welding; the mounting grooves 64 are arranged at both ends of the inner cylinder 10, the upper valve gasket 7 is riveted in the mounting groove 64 close to the diaphragm 4 of the inner cylinder 10, and the lower valve gasket 8 is riveted in the mounting groove 64 away from the diaphragm 4 of the inner cylinder 10.

[0060] During installation, the gasket is first installed inside the interface 31 of the valve body 3, then the inner cylinder 10 is installed into the interface 31 of the valve body 3, and then the outer ring 9 is installed into the interface 31 of the valve body 3. Then the valve body 3 is screwed into 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 are removed from the valve body 3. At this time, only the inner cylinder 10 on which the upper valve gasket 7 and the lower valve gasket 8 are installed needs to be replaced, and then the above process is repeated to complete the installation of the diaphragm valve. The separate arrangement of the outer ring 9 and the inner cylinder 10 makes it possible to complete the repair by only replacing the inner cylinder 10, thereby further reducing the repair cost.

[0061] Embodiment 3

[0062] With reference to Figure 5 and Figure 6 , the embodiment discloses a diaphragm valve, which comprises 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 are the same as those in Embodiment 1 and will not be described here. The sealing assembly comprises a sealing ring 6, an upper valve gasket 7, a lower valve gasket 8, and a diaphragm 4. The structure of the sealing assembly is the same as that in Embodiment 2 and will not be described here.

[0063] Further, 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 symmetrical structure up and down, and thus the inner cylinder 10 can be installed in a forward direction or in a reverse direction.

[0064] After the diaphragm valve is installed, the sealing assembly is located between the valve body 3 and the valve cover 1, the upper valve gasket 7 is located on the side close to the diaphragm 4, and the upper valve gasket 7 can directly contact the flowing medium, so that the surface of the upper valve gasket 7 is more easily damaged after a long time of work. The lower valve gasket 8 is located on the side away from the diaphragm 4 and is located between the inner cylinder 10 and the valve body 3, so that the lower valve gasket 8 is not easily directly contacted with the flowing medium, and the surface quality of the lower valve gasket 8 is maintained better under the same working time. Thus, when the upper valve gasket 7 is damaged after a long time of work, the sealing assembly can be removed, and then the inner cylinder 10 is installed in a reverse direction and is reinstalled. At this time, the lower valve gasket 8 is on the side close to the diaphragm 4, and the upper valve gasket 7 is on the side away from the diaphragm 4, so that the leakage problem of the diaphragm valve can be improved without replacing parts, which helps to prolong the service life of the sealing assembly.

[0065] With reference to Figure 6Further, the valve body 3 is fixedly connected with a sealing member close to one side of the inner cylinder 10, and the sealing member comprises an inner sealing ring 12 and an outer sealing ring 13. The inner sealing ring 12 is coaxially arranged outside the end opening of the inlet channel 32, and the outer sealing ring 13 is coaxially arranged outside 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, the inner cylinder 10 is provided with a receiving groove 102 at each end, and each end of the inner cylinder 10 is provided with two receiving grooves 102. The two receiving grooves 102 at the same end of the inner cylinder 10 correspond to the inner sealing ring 12 and the outer sealing ring 13 respectively. Thus, after the valve body 3 is screwed on the valve cover 1, the inner sealing ring 12 and the outer sealing ring 13 are tightly pressed against the inner walls of the corresponding receiving grooves 102, thereby further enhancing the sealing effect of the connection between the inner cylinder 10 and the valve body 3.

[0066] The cross sections of the inner sealing ring 12 and the outer sealing ring 13 away from the valve body 3 are triangular, and the cross section shape of the receiving groove 102 is adapted to the cross section shape of the inner sealing ring 12 and the outer sealing ring 13, thereby further enhancing the sealing effect.

[0067] In addition, the receiving groove 102 is bonded with a flexible pad 14 made of rubber, thereby helping to enhance the sealing effect.

[0068] The above is an optional embodiment of the present application, and does not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A diaphragm valve, characterized in that, include: Valve body (3); A sealing ring (6) is provided with a through-hole (61) and an annular groove (62) on both sides of the sealing ring (6). The annular groove (62) is located outside the center hole (61). A connecting hole (63) is provided on the sealing ring (6) to connect the two annular grooves (62) to each other, so that the medium in one of the annular grooves (62) can flow into the other annular groove (62) through the connecting hole (63). Upper valve gasket (7), the upper valve gasket (7) is fixedly disposed on one side of the sealing ring (6), the upper valve gasket (7) is located outside the central hole (61); A diaphragm (4) is disposed on the side of the sealing ring (6) near the upper valve pad (7). The edge of the diaphragm (4) is fixedly connected to the sealing ring (6). The diaphragm (4) is elastic so that it can abut against the upper valve pad (7) after being subjected to force. A lower valve pad (8) is fixedly connected to the sealing ring (6) on the side away from the upper valve pad (7). The sealing ring (6) includes an outer ring (9) and an inner cylinder (10) arranged coaxially. The diaphragm (4) is fixedly connected to the outer ring (9). The upper valve gasket (7) is fixedly connected to the end of the inner cylinder (10) near the diaphragm (4). The lower valve gasket (8) is fixedly connected to the end of the inner cylinder (10) away from the diaphragm (4). The outer ring (9) is slidably sleeved on the outer wall of the inner cylinder (10) along its own axis. A limiting ring (101) for abutting against the outer ring (9) is coaxially fixedly connected to the outer wall of the inner cylinder (10). The outer ring (9) is disposed in the valve body (3), and the limiting ring (101) is disposed centrally on the outer wall of the inner cylinder (10) along the axial direction of the inner cylinder (10); Both ends of the inner cylinder (10) are provided with receiving grooves (102), and the valve body (3) is fixedly provided with a sealing element for abutting against the inner wall of the receiving groove (102) on the side near the inner cylinder (10). The sealing element includes an inner sealing ring (12) and an outer sealing ring (13). The inner sealing ring (12) is coaxially disposed on the inner side of the lower valve gasket (8), and the outer sealing ring (13) is coaxially disposed on the outer side of the lower valve gasket (8).

2. A diaphragm valve according to claim 1, characterized in that: The connecting holes (63) are provided in multiple ways and are arranged in a circular array.

3. A diaphragm valve according to claim 1, characterized in that: The sealing ring (6) has a gasket on the side near the lower valve pad (8) for abutting against the lower valve pad (8) and the sealing ring (6).

4. A diaphragm valve according to claim 1, characterized in that: The cross-sections of the inner sealing ring (12) and the outer sealing ring (13) are both sharp on the side away from the valve body (3).

5. A diaphragm valve according to claim 4, characterized in that: The receiving groove (102) is provided with a flexible pad (14) for abutting against the inner sealing ring (12) or the outer sealing ring (13).

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