Butterfly valve sealing structure

Abstract

The utility model belongs to valve technical field, concretely relates to a butterfly valve sealing structure. The utility model discloses the inside of valve body is equipped with the disc plate for controlling fluid on-off, and the disc plate is connected with the valve rod that drives its rotation, and the lower end of valve rod is connected with valve rod connecting plate, and valve rod connecting plate and disc plate are equipped with sliding seal element, the inside of valve body is equipped with the valve seat that uses with disc plate cooperation, and the sealing surface of disc plate realizes the closure of butterfly valve when contacting with valve seat, sliding seal element includes the support seat that is connected with disc plate, and support seat can slide relative to valve rod connecting plate, and disc plate produces relative displacement relative to valve seat through compression elastic compensation spare when being subjected to enough acting force, and the sealing property of disc plate relative to valve seat is increased. When elastic compensation spare is compressed, disc plate can produce relative displacement to valve seat direction, and the contact pressure of disc plate and valve seat is increased, makes disc plate and valve seat close more closely, and the sealing property of disc plate and valve seat is increased, thereby increasing the sealing property of butterfly valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve equipment technology, and specifically relates to a butterfly valve sealing structure. Background Technology

[0002] A butterfly valve is a relatively simple regulating valve, typically used for shutting off or throttling various types of fluids in pipelines. Butterfly valves have advantages such as simple structure, small size, light weight, and low fluid resistance; however, their sealing performance is limited, especially when the pressure inside the pipeline changes, as they cannot achieve a complete seal. Therefore, it is necessary to optimize the sealing structure of butterfly valves.

[0003] Given the above problems, it is particularly important to design a butterfly valve that can effectively improve the sealing performance of the butterfly valve. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a butterfly valve that can improve sealing performance.

[0005] To solve the above-mentioned technical problems, this utility model provides a butterfly valve sealing structure, including a valve body. The inner side of the valve body is provided with a disc for controlling fluid flow. The disc is connected to a valve stem that drives its rotation. The lower end of the valve stem is connected to a valve stem connecting plate. A sliding assembly is provided between the valve stem connecting plate and the disc. The inner side of the valve body is provided with a valve seat that cooperates with the disc. When the sealing surface of the disc contacts the valve seat, the butterfly valve is closed. The sliding assembly includes a support seat connected to the disc, and the support seat can be connected relative to the valve stem. The disc plate slides, and the support base is provided with multiple connecting supports that are slidably connected to it. The connecting supports are arranged along the axial direction of the disc plate. One end of the connecting support is connected to the valve stem connecting plate, the middle part of the connecting support is slidably connected to the support base, and the right side of the other end of the connecting support can contact the disc plate. Each connecting support and the support base is provided with an annular elastic compensation member. When the disc plate is subjected to a force, the elastic compensation member is compressed to cause the disc plate to generate a relative displacement relative to the valve seat, thereby increasing the sealing performance of the disc plate relative to the valve seat.

[0006] This invention utilizes a sliding seal between the valve stem connecting plate and the disc. When the pressure of the fluid in the pipeline increases, the disc is subjected to moving pressure. The support seat compresses the elastic compensator, causing deformation and relative displacement between the disc and the valve seat. This increases the contact pressure between the disc and the valve seat, resulting in a tighter fit and improved sealing performance of the butterfly valve. The elastic compensator design allows the disc to automatically compensate for sealing under external forces. Compared to ordinary butterfly valves, it better adapts to sealing requirements under different operating conditions, reduces leakage risks, and can compensate for the impact of pipeline pressure changes, thermal expansion and contraction, and other factors on sealing performance, thus improving the reliability and stability of the butterfly valve under complex operating conditions.

[0007] Furthermore, the connecting support is T-shaped, with its larger end close to the disc plate. The support base has a T-shaped groove corresponding to the connecting support. The left and right width of the larger end of the T-shaped groove is larger than the left and right width of the larger end of the connecting support. The connecting support is disposed in the T-shaped groove and can slide relative to it. An elastic compensation member is provided between the connecting support and the support base. The elastic compensation member is disposed inside the T-shaped groove. The elastic compensation member can be compressed under pressure, thereby allowing the connecting support to generate relative displacement relative to the support base.

[0008] Furthermore, the sum of the widths of the limiting seat and the elastic compensation member is equal to the width of the larger end of the T-shaped groove on the support seat, ensuring that when the elastic compensation member is not compressed, the right side of the seat is in contact with the butterfly valve.

[0009] Furthermore, an annular elastic sealing element for auxiliary sealing is provided between the disc and the valve seat. A sealing pressure plate that slides along the axial direction is provided on the side of the disc near the valve seat. The sealing pressure plate and the disc form a variable volume receiving space. The elastic sealing element is disposed in the receiving space and can contact the valve seat. When the sealing pressure plate slides relative to the disc, the elastic sealing element can be compressed.

[0010] Furthermore, the disc plate has an annular groove for placing an elastic seal on the circumferential direction of the side near the valve seat. The annular groove extends from the side of the disc plate near the valve seat to the other side. The elastic seal is placed in the annular groove and can contact the valve seat. The left and right width of the elastic seal is greater than the left and right width of the annular groove. The sealing pressure plate is disposed on the end face of the disc plate and slidably connected to it. Multiple sets of guide connectors are provided between the sealing pressure plate and the disc plate, evenly distributed along the circumference of the sealing pressure plate. One end of the guide connector is connected to the disc plate, and the other end of the guide connector is slidably connected to the sealing pressure plate.

[0011] Furthermore, each set of guide connectors includes a guide rod that is slidably connected to the sealing plate. The left side of the guide rod can contact the disc plate. The sealing plate is provided with a clearance hole for the guide rod to pass through. The middle part of the guide rod can slide relative to the clearance hole. One end of the guide rod is provided with a screw threadedly connected to the disc plate. The other end of the guide rod is provided with a pressure rod. The pressure plate can limit the maximum sliding distance between the sealing plate and the guide rod, so that the sealing plate can slide between the disc plate and the pressure plate.

[0012] In summary, this invention, by incorporating a sliding seal between the valve stem connecting plate and the disc, allows the disc to compress the elastic compensating element via the support seat when the fluid pressure in the pipeline increases. This deformation of the elastic compensating element causes relative displacement between the disc and the valve seat, increasing the contact pressure between them and resulting in a tighter fit and improved sealing performance of the butterfly valve. The elastic compensating element design enables the disc to automatically compensate for sealing under external forces. Compared to ordinary butterfly valves, this design better adapts to sealing requirements under different operating conditions, reduces leakage risks, and can compensate for the impact of pipeline pressure changes, thermal expansion and contraction, and other factors on sealing performance, thus improving the reliability and stability of the butterfly valve under complex operating conditions. Attached Figure Description

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a partially enlarged schematic diagram of part B of the present invention;

[0017] Figure 4 This is a partially enlarged schematic diagram of point C in this utility model;

[0018] In the diagram: 101-valve body, 201-disc plate, 202-valve seat, 203-sealing pressure plate, 204-elastic seal, 205-pressure rod, 206-guide rod, 207-screw, 208-support seat, 209-valve stem connecting plate, 210-connecting support, 211-elastic compensation element, 4-valve stem. Detailed Implementation

[0019] See attached document Figure 1 and attached Figure 2This utility model provides a butterfly valve sealing structure, including a valve body 101, the interior of which is open from left to right to facilitate fluid passage. A disc 201 for controlling fluid flow is provided on the inner side of the valve body 101. The disc 201 is connected to a valve stem 4 that drives its rotation. The valve stem 4 is rotatably connected to the valve body 101 and a seal is provided at the connection to prevent fluid leakage. Rotating the valve stem 4 causes the disc 201 to rotate, thereby opening and closing the butterfly valve. The valve stem 4 extends from the outer side to the inner side of the valve body 101 and is connected to a valve stem connecting plate 209 on the inner side of the valve body 101. A sliding assembly is provided between the valve stem connecting plate 209 and the disc 201. The upper end of the valve stem 4 is connected to a driver that drives its rotation, such as a motor with a brake.

[0020] The inner side of the valve body 101 is provided with a valve seat 202 that works with the disc 201. When the sealing surface of the disc 201 contacts the valve seat 202, the butterfly valve can be closed.

[0021] See appendix Figure 2 and attached Figure 3 The sliding assembly includes a support base 208 connected to the disc 201. The support base 208 can slide relative to the valve stem connecting plate 209. The support base 208 is provided with a plurality of connecting supports 210 slidably connected thereto. The connecting supports 210 are arranged along the axial direction of the disc 201. One end of the connecting support 210 is connected to the valve stem connecting plate 209. The middle part of the connecting support 210 is slidably connected to the support base 208. The right side of the other end of the connecting support 210 can contact the disc 201. Each connecting support 210 and the support base 208 is provided with an annular elastic compensation member 211, such as a rubber ring. The cross-section of the elastic compensation member 211 can be rectangular. The elastic compensation member 211 can be compressed when subjected to a certain pressure. Figure 3 In this structure, the connecting support 210 has a T-shaped structure, with its large end close to the disc plate 201. The right side of the large end can contact the disc plate 201. The support base 208 has a T-shaped groove corresponding to the connecting support 210. The left and right width of the large end of the T-shaped groove is larger than the left and right width of the large end of the connecting support 210. The connecting support 210 is set in the T-shaped groove and can slide relative to it. An elastic compensation element 211, such as a rubber ring, is provided between the connecting support 210 and the support base 208. The elastic compensation element 211 is set inside the T-shaped groove and between the left side of the large end of the T-shaped groove and the left side of the large end of the connecting support 210. The elastic compensation element 211 can be compressed when subjected to pressure, thereby allowing the connecting support 210 to have a relative displacement with respect to the support base 208.

[0022] The width dimensions of the large end of the connecting support 210 and the width dimensions of the elastic compensation member 211 are controlled so that the sum of the widths of the large end of the connecting support 210 and the elastic compensation member 211 is equal to the width dimension of the large end of the T-shaped groove on the support base 208, ensuring that the right side of the connecting support 210 is in contact with the disc plate 201 when the elastic compensation member 211 is not compressed.

[0023] With the above structure, in normal use, the valve stem 4 is driven to rotate by a motor. The valve stem 4 drives the disc 201 to rotate via the valve stem connecting plate 209, connecting support 210, and support base 208. The sealing surface of the disc 201 contacts the valve seat 202 to achieve a seal, thus closing the butterfly valve. In the closed state, the disc 201 and valve seat 202 are in a sealed state; fluid flowing in direction A cannot pass through the butterfly valve. When the pressure inside the pipeline increases, for example, in a multi-branch water pipeline, the closure of other branch pipelines will cause the pressure inside the pipeline to increase. The water pressure will increase the force A on the disc 201. The disc 201 will apply the force A to the elastic compensator 211 through the support seat 208 connected to it. Since the valve stem connecting rod 209 is connected to the valve stem 4, and the valve stem 4 is rotatably connected to the valve body 101, and the elastic compensator 211 has a certain elasticity, when the force A on the disc 201 increases, the elastic compensator 211 can be compressed. When the elastic compensator 211 is compressed, the disc 201 can move towards the valve seat 202, which increases the contact pressure between the disc 201 and the valve seat 202, making the disc 201 and the valve seat 202 fit more tightly and increasing the sealing performance between the disc 201 and the valve seat 202.

[0024] See Figure 2 and Figure 4 An annular elastic seal 204 for auxiliary sealing is provided between the disc 201 and the valve seat 202. The elastic seal 204 has a rectangular cross-section. A sealing pressure plate 203 that slides axially along the side of the disc 201 near the valve seat 202 is provided. The sealing pressure plate 203 and the disc 201 form a variable-volume receiving space. The elastic seal 204 is disposed in this receiving space and can contact the valve seat 202. When the sealing pressure plate 203 slides relative to the disc 201, the elastic seal 204 can be compressed. See also Figure 4The disc plate 201 has an annular groove on the circumference of the side near the valve seat 202 for placing the elastic seal 204. The annular groove extends from the side of the disc plate 201 near the valve seat 202 to the other side. The elastic seal 204 is placed in the annular groove and extends a certain distance towards the valve seat 202 so that one side of the elastic seal 204 protrudes from the disc plate 201 and can contact the valve seat 202. That is, the left and right width of the elastic seal 204 is greater than the left and right width of the annular groove. The protruding part of the elastic seal 204 can contact the sealing pressure plate 203. The sealing pressure plate 203 is set on the end face of the disc plate 201 and is slidably connected to it. That is, the sealing pressure plate 203 and the disc plate 201 form a variable volume receiving space. The elastic seal 204 is set inside the receiving space. Multiple sets of guide connectors are provided between the sealing pressure plate 203 and the disc plate 201, evenly distributed along the circumference of the sealing pressure plate 203. One end of the guide connector is connected to the disc plate 201, and the other end of the guide connector is slidably connected to the sealing pressure plate 203. Figure 4 In this assembly, each set of guide connectors includes a guide rod 206 that is slidably connected to the sealing pressure plate 203. The left side of the guide rod 206 can contact the disc plate 201. The sealing pressure plate 203 is provided with a clearance hole for the guide rod 206 to pass through. The middle part of the guide rod 206 can slide relative to the clearance hole. One end of the guide rod 206 is provided with a screw 207 that is threadedly connected to the disc plate 201. After the screw 207 is connected to the disc plate 201, it can ensure that the guide rod 206 cannot move relative to the disc plate 201. The other end of the guide rod 206 is provided with a pressure rod 205. The diameter of the pressure rod 205 is larger than the diameter of the clearance hole. The pressure rod 205 can limit the maximum sliding distance between the sealing pressure plate 203 and the guide rod 206, so that the sealing pressure plate 203 can slide between the disc plate 201 and the pressure rod 205. The sealing plate 203 can slide relative to the disc 201 within a certain range through this structure. When the sealing plate 203 moves toward the butterfly valve 2, it can squeeze the elastic seal 204. The squeezed elastic seal 204 can fill the sealing plate 203 and the valve seat 202, causing the elastic seal 204 to deform and thus increase the degree of fit with the valve seat 202.

[0025] The axial dimension of the guide rod 206 is greater than the left and right width of the sealing plate 203, so that the sealing plate 203 can slide relative to the guide rod 206 within a certain range, ensuring that the sealing plate 203 can slide relative to the disc 201. The difference between the left and right dimensions of the guide rod 206 and the sealing plate 203 is not greater than the difference between the left and right widths of the annular groove opened on the elastic seal 204 and the disc 201, ensuring that after the left side of the guide rod 206 contacts the disc 201 and the guide connector is fastened to the disc 201, a certain sliding space can be reserved between the sealing plate 203 and the disc 201 to realize the compression effect of the sealing plate 203 on the elastic seal 204.

[0026] This utility model, through the above structure, allows for water flow in the pipe to flow backwards, as shown in the attached... Figure 2 The reverse flow along A causes pressure from the counter-flowing water to act directly on the sealing plate 203. Since the protruding part of the elastic seal 204 relative to the butterfly valve 2 contacts the sealing plate 203, the reverse force on the sealing plate 203 acts on the elastic seal 204. Because the butterfly valve 2 is connected to the valve stem 4 via the connecting support 210 and the valve stem connecting plate 209, the sealing plate 203 can compress the elastic seal 204 when subjected to the reverse force. Since one side of the elastic seal 204 protrudes from the disc 201 and can contact the valve seat 202, when the elastic seal 204 deforms, the contact point between the elastic seal 204 and the valve seat 202 becomes more fitted. This fit provides a certain degree of interception and sealing for the fluid. Because the elastic seal 204 has a ring structure, it also provides auxiliary sealing. Furthermore, the threaded connection between the elastic seal 204 and the disc 201 via the guide connector facilitates the replacement of the elastic seal 204.

[0027] This invention utilizes a sliding seal between the valve stem connecting plate and the disc. When the pressure of the fluid in the pipeline increases, the disc is subjected to moving pressure. The support seat compresses the elastic compensator, causing deformation and relative displacement between the disc and the valve seat. This increases the contact pressure between the disc and the valve seat, resulting in a tighter fit and improved sealing performance of the butterfly valve. The elastic compensator design allows the disc to automatically compensate for sealing under external forces. Compared to ordinary butterfly valves, it better adapts to sealing requirements under different operating conditions, reduces leakage risks, and can compensate for the impact of pipeline pressure changes, thermal expansion and contraction, and other factors on sealing performance, thus improving the reliability and stability of the butterfly valve under complex operating conditions.

[0028] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A butterfly valve sealing structure, comprising a valve body, characterized in that, The valve body has a disc plate on its inner side for controlling the flow of fluid. The disc plate is connected to a valve stem that drives it to rotate. The lower end of the valve stem is connected to a valve stem connecting plate. A sliding assembly is provided between the valve stem connecting plate and the disc plate. The inner side of the valve body is provided with a valve seat that cooperates with the disc plate. When the sealing surface of the disc plate contacts the valve seat, the butterfly valve is closed. The sliding assembly includes a support base connected to the disc plate, the support base being slidable relative to the valve stem connecting plate, the support base having multiple connecting supports slidably connected thereto, the connecting supports being arranged along the axial direction of the disc plate, one end of the connecting support being connected to the valve stem connecting plate, the middle part of the connecting support being slidably connected to the support base, and the right side of the other end of the connecting support being able to contact the disc plate, each connecting support being provided with an annular elastic compensation member between it and the support base, when the disc plate is subjected to a force, the elastic compensation member is compressed to cause the disc plate to generate relative displacement relative to the valve seat, thereby increasing the sealing performance of the disc plate relative to the valve seat.

2. The butterfly valve sealing structure as described in claim 1, characterized in that, The connecting support is T-shaped, with its larger end close to the disc plate. The support base has a T-shaped groove corresponding to the connecting support. The left and right width of the larger end of the T-shaped groove is larger than the left and right width of the larger end of the connecting support. The connecting support is disposed in the T-shaped groove and can slide relative to it. An elastic compensation member is provided between the connecting support and the support base. The elastic compensation member is disposed inside the T-shaped groove. The elastic compensation member can be compressed under pressure, thereby allowing the connecting support to generate relative displacement with respect to the support base.

3. The butterfly valve sealing structure as described in claim 1, characterized in that, An annular elastic sealing element for auxiliary sealing is provided between the disc and the valve seat. A sealing pressure plate that slides along the axial direction is provided on the side of the disc near the valve seat. The sealing pressure plate and the disc form a variable volume receiving space. The elastic sealing element is disposed in the receiving space and can contact the valve seat. When the sealing pressure plate slides relative to the disc, the elastic sealing element can be compressed.

4. The butterfly valve sealing structure as described in claim 3, characterized in that, The disc plate has an annular groove for placing an elastic seal on its circumferential side near the valve seat. The annular groove extends from the side of the disc plate near the valve seat to the other side. The elastic seal is placed in the annular groove, and the left and right width of the elastic seal is greater than the left and right width of the annular groove. The sealing pressure plate is disposed on the end face of the disc plate and is slidably connected to it. Multiple sets of guide connectors are provided between the sealing pressure plate and the disc plate, evenly distributed along the circumference of the sealing pressure plate. One end of the guide connector is connected to the disc plate, and the other end of the guide connector is slidably connected to the sealing pressure plate.

5. The butterfly valve sealing structure as described in claim 4, characterized in that, Each set of guide connectors includes a guide rod that is slidably connected to the sealing plate. The left side of the guide rod can contact the disc plate. The sealing plate is provided with a clearance hole for the guide rod to pass through. The middle part of the guide rod can slide relative to the clearance hole. One end of the guide rod is provided with a screw threadedly connected to the disc plate. The other end of the guide rod is provided with a pressure rod. The pressure plate can limit the maximum sliding distance between the sealing plate and the guide rod, so that the sealing plate can slide between the disc plate and the pressure plate.

Images