Valve seat sealing structure and butterfly valve

Abstract

The utility model relates to valve sealing technical field discloses a valve seat sealing structure and butterfly valve, valve seat sealing structure, including valve seat unit, can be dismantled and installed in the valve body, sealing element is set between valve seat unit and valve body, and sealing element is suitable for with valve seat unit forms sealing structure, adjusting unit is set on the valve body in the side of valve seat unit away from sealing element, through drive adjusting unit, to realize the position adjustment of valve seat unit and / or to valve seat unit exert pre -tightening force. The utility model is located in the side of valve seat unit away from adjusting unit of sealing element, through drive adjusting unit can realize the position adjustment of valve seat unit, also can exert pre -tightening force to valve seat unit, thereby can alleviate because valve seat and valve body material thermal expansion coefficient is different, under the deep cold or high temperature working condition leads to the sealing surface junction seal performance decline condition, reduces the occurrence of sealing surface deformation phenomenon, and further reduces the possibility of leakage caused by sealing problem.

Description

Technical Field

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

[0002] In industrial fields such as coal chemical, polysilicon, and LNG cryogenic air separation, valves often need to handle slurries, particulate matter, or media at extreme temperatures. Under such conditions, the valve seat sealing surface is prone to wear due to frequent opening and closing or particle erosion, or deformation of the valve seat sealing surface due to thermal expansion and contraction caused by alternating high and low temperatures, leading to leakage.

[0003] In existing technologies, solutions have been developed to reduce maintenance costs by replacing valve seats. For example, a structure using guide grooves and pins allows for quick assembly and disassembly of the valve seat. However, while this type of structure primarily addresses the ease of replacement, under cryogenic or high-temperature conditions, the different coefficients of thermal expansion of the sealing materials can reduce the sealing performance at the connection between the valve seat sealing surface and the sealing element, or even cause deformation, thereby increasing the risk of seal failure. Utility Model Content

[0004] This utility model provides a valve seat sealing structure and a butterfly valve to solve the problem in the prior art that, under cryogenic or high-temperature conditions, the sealing performance at the connection of the sealing surface decreases, and deformation and leakage easily occur due to the difference in the thermal expansion coefficients of the valve seat and valve body materials.

[0005] In a first aspect, this utility model provides a valve seat sealing structure, comprising: The valve seat unit is detachably installed within the valve body; A sealing element is disposed between the valve seat unit and the valve body, and the sealing element is adapted to form a sealing structure with the valve seat unit; An adjustment unit is disposed on the valve body on the side of the valve seat unit away from the seal. By driving the adjustment unit, the position of the valve seat unit can be adjusted and / or a preload can be applied to the valve seat unit.

[0006] Optionally, the adjustment unit includes: A force transmission component, which is adjustablely disposed on the side of the valve seat unit away from the seal; An adjusting member is provided, one end of which is fixedly disposed in the force transmission member, and the other end of which abuts against the valve seat unit. By driving the adjusting member, the position of the valve seat unit can be adjusted and / or a preload can be applied to the valve seat unit.

[0007] Optionally, the adjusting member is a bolt adjusting member, which includes a driving part fixed in the force transmission member and an actuating part that abuts against the valve seat unit. The driving part is adapted to receive external driving force and transmit the driving force to the valve seat unit through the actuating part.

[0008] Optionally, the force transmission component is a pressure ring force transmission component, which is disposed on the side of the valve seat unit away from the seal, and is adapted to transmit the force of the adjusting component to the valve seat unit.

[0009] Optionally, the adjustment sheet further includes: The first fastener is used to fasten the force transmission component to the valve body.

[0010] Optionally, the first fastener is a fastening screw, and the valve body is provided with a first threaded hole, and the fastening screw is threadedly connected to the valve body.

[0011] Optionally, an anti-loosening element is provided between the fastening screw and the valve body.

[0012] Optionally, the seal is fixed to the butterfly plate frame by a second fastener.

[0013] Optionally, the valve seat unit is detachably connected to the valve body via at least one connector, the valve body is provided with a second threaded hole that mates with the connector, and the valve seat unit is provided with a third threaded hole that mates with the connector.

[0014] Beneficial effects: The valve seat sealing structure provided by this utility model includes a valve seat unit, which is detachably installed in the valve body; a sealing element, which is disposed between the valve seat unit and the valve body, and the sealing element is adapted to form a sealing structure with the valve seat unit; and an adjusting unit, which is disposed on the valve body on the side of the valve seat unit away from the sealing element. By driving the adjusting unit, the position of the valve seat unit can be adjusted or a preload can be applied to the valve seat unit.

[0015] The valve seat sealing structure provided by this utility model features a detachable valve seat unit, which continues the advantage of convenient replacement and facilitates maintenance when the valve seat is worn, reducing the operational difficulty of subsequent maintenance. By setting a sealing element between the valve seat unit and the valve body, a sealing structure can be formed, providing a sealing guarantee at the connection between the two. The adjustment unit located on the side of the valve seat unit away from the sealing element can both adjust the position of the valve seat unit and apply a pre-tightening force to the valve seat unit. This can alleviate the situation where the sealing performance at the connection of the sealing surface decreases due to the difference in thermal expansion coefficients between the valve seat and the valve body materials under cryogenic or high-temperature conditions, reduce the occurrence of sealing surface deformation, and thus reduce the possibility of leakage caused by sealing problems, ensuring the stable operation of the valve in handling slurries, particulate matter, or extreme temperature media.

[0016] Secondly, this utility model also provides a butterfly valve, including the valve seat sealing structure described above. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional schematic diagram of a butterfly valve according to an embodiment of the present utility model; Figure 2 Figure 1 A magnified view of part A in the diagram; Explanation of reference numerals in the attached figures: 1. Valve seat unit; 2. Seal; 3. Adjustment unit; 31. Force transmission component; 32. Adjustment component; 33. First fastener; 4. Second fastener; 5. Butterfly plate frame; 6. Valve body. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0021] According to an embodiment of the present invention, in one aspect, a valve seat sealing structure is provided, comprising: Valve seat unit 1 is detachably installed inside valve body 6; A sealing element 2 is disposed between the valve seat unit 1 and the valve body 6, and the sealing element 2 is adapted to form a sealing structure with the valve seat unit 1; The adjusting unit 3 is located on the valve body 6 on the side of the valve seat unit 1 away from the seal 2. By driving the adjusting unit 3, the position of the valve seat unit 1 can be adjusted and / or a preload can be applied to the valve seat unit 1.

[0022] The valve seat sealing structure provided in this embodiment features a detachable valve seat unit 1, which continues the advantage of convenient replacement and facilitates maintenance when the valve seat is worn, reducing the operational difficulty of subsequent maintenance. By setting a sealing element 2 between the valve seat unit 1 and the valve body 6, a sealing structure can be formed with the valve seat unit 1, providing a sealing guarantee at the connection between the two. The adjustment unit 3, located on the side of the valve seat unit 1 away from the sealing element 2, can both adjust the position of the valve seat unit 1 and apply a pre-tightening force to the valve seat unit 1. This can alleviate the situation where the sealing performance at the connection of the sealing surface decreases due to the difference in thermal expansion coefficients between the valve seat and the valve body 6 under cryogenic or high-temperature conditions, reduce the occurrence of sealing surface deformation, and thus reduce the possibility of leakage caused by sealing problems, ensuring the stable operation of the valve in handling slurries, particulate matter, or extreme temperature media.

[0023] Furthermore, the adjustment unit 3 includes: Force transmission component 31 is adjustablely located on the side of valve seat unit 1 away from seal 2; Adjusting member 32, one end of which is fixedly disposed in force transmission member 31, and the other end of which abuts against valve seat unit 1. By driving adjusting member 32, the position of valve seat unit 1 can be adjusted and / or a preload can be applied to valve seat unit 1.

[0024] In a straightforward manner, the force transmission component 31 is adjustablely positioned on the side of the valve seat unit 1 away from the seal 2, providing a stable mounting base and force transmission carrier for the adjusting component 32, ensuring uniform and stable force transmission during adjustment. The structure of the adjusting component 32, with one end fixed to the force transmission component 31 and the other end abutting against the valve seat unit 1, allows direct action on the valve seat unit 1 via the driving component 32. This enables position adjustment of the valve seat unit 1, facilitating adjustments to the valve seat position according to operating conditions or the condition of the sealing surface. This ensures that the first sealing structure formed by the seal 2 and the valve seat unit 1 is always in good contact. Furthermore, it can apply a pre-tightening force to the valve seat unit 1, effectively offsetting the gap or deformation caused by the difference in thermal expansion coefficients between the valve seat and valve body 6 materials under cryogenic or high-temperature conditions, further enhancing the sealing effect at the sealing surface connection and reducing the risk of seal failure.

[0025] Furthermore, the adjusting member 32 is a bolt adjusting member 32, which includes a driving part fixed in the force transmission member 31 and an action part that abuts against the valve seat unit 1. The driving part is adapted to receive external driving force and transmit the driving force to the valve seat unit 1 through the action part.

[0026] It is easy to understand that the adjusting member 32 is set as a bolt adjusting member 32, and the driving part is fixed inside the force transmission member 31. It can stably receive external driving force and directly transmit the driving force to the valve seat unit 1 through the actuating part without the need for an additional complex force transmission structure, ensuring the timeliness and accuracy of position adjustment and preload application. Furthermore, the force transmission member 31 is a pressure ring force transmission member, which is set on the side of the valve seat unit 1 away from the seal member 2. The pressure ring force transmission member is suitable for transmitting the force of the adjusting member 32 to the valve seat unit 1.

[0027] In an alternative embodiment, a set screw adjusting member 32 can be used as the adjusting member 32. One end of the set screw adjusting member 32 can form a fixed fit with the force transmission member 31 through a thread (similar to the driving part of a bolt), and the other end directly abuts against the valve seat unit 1 (corresponding to the working part of a bolt). The external driving force can be transmitted to the valve seat unit 1 by turning the head of the set screw to realize position adjustment and preload application. Its working principle is the same as that of the bolt adjusting member 32, and it also has the characteristics of simple structure and easy control of adjustment accuracy.

[0028] Furthermore, the force transmission component 31 is a pressure ring force transmission component, which is located on the side of the valve seat unit 1 away from the seal 2. The pressure ring force transmission component is suitable for transmitting the force of the adjusting component 32 to the valve seat unit 1.

[0029] It is easy to understand that the force transmission component 31 is set as a pressure ring force transmission component. Its annular structure can form a good fit with the end face of the valve seat unit 1 away from the sealing component 2. When transmitting the force of the adjusting component 32, the force can be evenly distributed to the annular contact surface of the valve seat unit 1, avoiding excessive local force that could cause deformation of the valve seat unit 1, effectively protecting the structural integrity of the valve seat unit 1, and ensuring that the preload or adjusting force can be stably applied to the valve seat unit 1, ensuring the accuracy of position adjustment and the fit of the sealing surface. Furthermore, the pressure ring force transmission component has a simple structure and strong compatibility with the valve body 6 and the adjusting component 32. Stable installation can be achieved without a complex installation and positioning structure, and the annular structure facilitates the even distribution of multiple adjusting components 32 in the circumference, improving the balance of adjustment and preload of the valve seat unit 1, and adapting to the sealing requirements of the valve under special media conditions.

[0030] In an alternative embodiment, an annular support plate can be used as the force transmission component 31. The annular support plate can also be fitted to the side of the valve seat unit 1 away from the seal 2. Its plate structure can provide a stable mounting base for the adjusting component 32. Through its own rigid support, it can evenly transmit the force of the adjusting component 32 to the valve seat unit 1. Moreover, the annular design can be adapted to valve seat units 1 of different specifications, and has good versatility.

[0031] Furthermore, the adjustment statement also includes: The first fastener 33 and the force transmission component 31 are mounted on the valve body 6 via the first fastener 33.

[0032] The first fastener 33 provides a reliable guarantee for the connection between the force transmission component 31 and the valve body 6, further optimizing the overall stability and practicality of the adjustment unit 3. By fixing the force transmission component 31 to the valve body 6 with the first fastener 33, displacement or loosening of the force transmission component 31 during the transmission of the force from the adjustment component 32 can be effectively avoided, ensuring a stable force transmission path. This ensures the accuracy of the adjustment component 32 in adjusting the position of the valve seat unit 1 and applying the pre-tightening force, providing a basic support for a good fit of the sealing surface.

[0033] Furthermore, the first fastener 33 is a fastening screw, and the valve body 6 is provided with a first threaded hole, and the fastening screw is threadedly connected to the valve body 6.

[0034] Specifically, in application, based on the structure of the force transmission component 31 (such as a pressure ring force transmission component) and the assembly requirements of the valve body 6, a first threaded hole matching the specifications of the fastening screw is first machined at the corresponding position on the valve body 6, ensuring that the depth and positional accuracy of the first threaded hole meet the assembly requirements. Then, the force transmission component 31 is placed on the corresponding installation position on the valve body 6, aligning the mounting hole on the force transmission component 31 with the first threaded hole on the valve body 6. The fastening screw is then passed through the mounting hole of the force transmission component 31 and screwed into the first threaded hole of the valve body 6. By tightening the fastening screw, the self-locking property and tightening force of the threaded connection are used to stably fix the force transmission component 31 on the valve body 6, preventing displacement of the force transmission component 31 during force application. If subsequent adjustment of the position of the force transmission component 31 or maintenance is required, simply reverse the tightening screw to loosen the force transmission component 31 for operation. After the operation is completed, retighten the screw to restore fixation.

[0035] Furthermore, an anti-loosening element is provided between the fastening screw and the valve body 6.

[0036] In an alternative embodiment, a hexagonal head bolt with a nut can be used as the first fastener 33. A smooth hole is machined on the valve body 6, and a through hole matching the bolt diameter is machined at the corresponding position on the force transmission component 31. After the bolt is passed through the through hole of the force transmission component 31 and the smooth hole of the valve body 6 in sequence, the nut is screwed on and tightened on the other side of the valve body 6. The force transmission component 31 is fixed to the valve body 6 through the cooperation of the bolt and nut. This structure is suitable for scenarios where the valve body 6 is thin, the first threaded hole is difficult to machine, or a stronger fastening force is required.

[0037] Furthermore, the seal 2 is fixedly mounted on the butterfly plate frame 5 by the second fastener 4.

[0038] In essence, the butterfly plate holder 5 is a support structure in the butterfly valve that carries the butterfly plate and related sealing components. Its overall structure must be compatible with the internal space of the valve body 6, providing a stable mounting base for the butterfly plate's rotation to ensure flexible valve opening and closing, and also providing a reliable mounting carrier for the sealing element 2. In this valve seat sealing structure, the butterfly plate holder 5, in conjunction with the second fastener 4, secures the sealing element 2, allowing it to be precisely positioned corresponding to the valve seat unit 1. This ensures that the first sealing structure formed by the sealing element 2 and the valve seat unit 1 always maintains a good fit.

[0039] Furthermore, the valve seat unit 1 is detachably connected to the valve body 6 via at least one connector. The valve body 6 is provided with a second threaded hole that mates with the connector, and the valve seat unit 1 is provided with a third threaded hole that mates with the connector.

[0040] In a straightforward manner, the valve seat unit 1 is detachably connected to the valve body 6 via at least one connector. The connector mates with the second threaded hole of the valve body 6 and the third threaded hole of the valve seat unit 1, facilitating installation, maintenance, and replacement. The threaded connection provides reliable fastening, ensuring the valve seat unit 1 is stably fixed in a preset position on the valve body 6. This prevents displacement due to media impact or temperature changes when handling slurries, particles, or media at extreme temperatures, providing a stable foundation for the first sealing structure formed by the sealing element 2 and the valve seat unit 1, thus guaranteeing sealing performance. Furthermore, the detachable design allows for easy removal of the valve seat unit 1 from the valve body 6 when wear, deformation, or maintenance or replacement is required. No destructive operations on the valve body 6 or the valve seat unit 1 are necessary, significantly reducing maintenance difficulty and cost.

[0041] According to an embodiment of the present invention, another aspect provides a butterfly valve, including the valve seat sealing structure described above.

[0042] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A valve seat sealing structure, characterized in that, include: The valve seat unit (1) is detachably installed inside the valve body (6); A sealing element (2) is disposed between the valve seat unit (1) and the valve body (6), and the sealing element (2) is adapted to form a sealing structure with the valve seat unit (1); An adjustment unit (3) is disposed on the valve body (6) on the side of the valve seat unit (1) away from the seal (2). By driving the adjustment unit (3), the position of the valve seat unit (1) can be adjusted and / or a preload can be applied to the valve seat unit (1).

2. The valve seat sealing structure according to claim 1, characterized in that, The adjustment unit (3) includes: Force transmission component (31), which is adjustablely disposed on the side of the valve seat unit (1) away from the seal (2); Adjusting component (32), one end of which is fixedly disposed in the force transmission component (31), and the other end of which abuts against the valve seat unit (1). By driving the adjusting component (32), the position of the valve seat unit (1) can be adjusted and / or a preload can be applied to the valve seat unit (1).

3. The valve seat sealing structure according to claim 2, characterized in that, The adjusting member (32) is a bolt adjusting member (32). The bolt adjusting member (32) includes a driving part fixed in the force transmission member (31) and an action part that abuts against the valve seat unit (1). The driving part is adapted to receive external driving force and transmit the driving force to the valve seat unit (1) through the action part.

4. The valve seat sealing structure according to claim 3, characterized in that, The force transmission component (31) is a pressure ring force transmission component, which is located on the side of the valve seat unit (1) away from the seal (2). The pressure ring force transmission component is adapted to transmit the force of the adjusting component (32) to the valve seat unit (1).

5. The valve seat sealing structure according to any one of claims 2-4, characterized in that, The adjustment sheet also includes: The first fastener (33) is used to mount the force transmission component (31) onto the valve body (6).

6. The valve seat sealing structure according to claim 5, characterized in that, The first fastener (33) is a fastening screw, and the valve body (6) is provided with a first threaded hole. The fastening screw is threadedly connected to the valve body (6).

7. The valve seat sealing structure according to claim 6, characterized in that, An anti-loosening element is provided between the fastening screw and the valve body (6).

8. The valve seat sealing structure according to any one of claims 1-4, characterized in that, The sealing element (2) is fixedly mounted on the butterfly plate frame (5) by the second fastener (4).

9. The valve seat sealing structure according to any one of claims 1-4, characterized in that, The valve seat unit (1) is detachably connected to the valve body (6) via at least one connector. The valve body (6) is provided with a second threaded hole that mates with the connector, and the valve seat unit (1) is provided with a third threaded hole that mates with the connector.

10. A butterfly valve, characterized in that, Includes the valve seat sealing structure as described in any one of claims 1 to 9.

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