Sealing-reinforced valve seat for butterfly valve

Abstract

The utility model relates to the technical field of valve seats, in particular to a sealing-reinforced valve seat for a butterfly valve, which comprises an annular body and tensioning rings symmetrically arranged on two sides of the annular body, the annular body and the tensioning rings are integrally formed, the annular body is provided with a valve rod mounting hole along the radial direction, and the valve rod mounting hole is communicated with the annular body. The outer side of the annular body is coaxially sleeved with an elastic annular protruding ring, and the elastic annular protruding ring is located between the outer ring face of the annular body and the inner surface of the valve body. Due to the fact that the elastic annular protruding ring is coaxially arranged on the outer side of the annular body in the sleeved mode and located between the outer ring face of the annular body and the inner surface of the valve body, when the inner side of the annular body is abraded after the valve plate rotates for multiple times, elasticity of the elastic annular protruding ring can push the annular body to press the outer surface of the side portion of the valve plate, and therefore the valve plate is prevented from being abraded. Good sealing performance of the valve seat and the valve seat is guaranteed, the service life of the valve seat is prolonged, and influences on normal production and life caused by frequent replacement of the valve seat are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valve seats, in particular to a valve seat for a butterfly valve with enhanced sealing. Background Art

[0002] The butterfly valve, also known as the flap valve, is a simple regulating valve that can be used for the switch control of low-pressure pipeline media. The butterfly valve refers to a valve whose closing part (valve disc or butterfly plate) is a disc, which rotates around the valve axis to achieve opening and closing. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays a role of cutting off and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulation. The butterfly valve seat is usually directly fixed in the butterfly valve. As the flap rotates, the outer side of the flap and the butterfly valve seat are constantly rubbed, which will cause the surface of the butterfly valve seat to wear, thereby affecting the sealing, causing fluid leakage, and poor sealing effect. The valve seat needs to be replaced frequently to ensure the sealing. When replacing the valve seat, the entire pipeline needs to be cut off. Frequent replacement of the valve seat will affect the progress and efficiency of the entire production. Therefore, there is an urgent need for a butterfly valve seat with a simple structure, durability and good sealing. Utility Model Content

[0003] The purpose of the utility model is to provide a valve seat for a butterfly valve with enhanced sealing, which can solve the above technical problems.

[0004] The utility model provides a valve seat for a butterfly valve with enhanced sealing, comprising an annular body and tensioning rings symmetrically arranged on both sides of the annular body, the annular body and the tensioning ring are integrally formed, the annular body is provided with a valve stem mounting hole along the radial direction, the outer side of the annular body is coaxially sleeved with an elastic annular convex ring, and the elastic annular convex ring is located between the outer ring surface of the annular body and the inner surface of the valve body.

[0005] Furthermore, the annular body and the tensioning ring are made of fluoroplastics.

[0006] Furthermore, the elastic annular convex ring is made of rubber and adhered to the outer ring surface of the annular body.

[0007] Furthermore, an annular flange is provided on the edge of the valve stem mounting hole extending radially outwardly from the annular body, and a flange through hole is provided on the elastic annular convex ring, and the inner wall of the flange through hole is tightly fitted with the outer wall of the annular flange. The annular flange is integrally formed with the annular body, and the annular flange can block the gap between the contact surface of the annular body and the elastic annular convex ring to prevent fluid leakage.

[0008] Furthermore, when no pressure is applied, the thickness of the elastic annular protrusion is greater than the gap between the outer ring surface of the annular body and the inner surface of the valve body.

[0009] Furthermore, when no pressure is applied, the thickness of the elastic annular protrusion is equal to the height of the annular flange.

[0010] Furthermore, the inner surface of the valve stem mounting hole is provided with a first annular protrusion, which can improve the sealing performance of the valve stem and the valve seat and prevent leakage. The first annular protrusion is integrally formed with the valve stem mounting hole, and when the valve stem is located in the valve stem mounting hole, the first annular protrusion (with elasticity) is tightly fitted with the outer surface of the valve stem, which can prevent the fluid from leaking in the gap between the inner wall of the valve stem mounting hole and the valve stem.

[0011] Furthermore, a plurality of the first annular protrusions are coaxially spaced apart.

[0012] Furthermore, a second annular protrusion is provided on the side annular end surface of the annular body, which can increase the sealing performance of the connection between the butterfly valve and the pipes at both ends. The second annular protrusion is integrally formed with the annular body, and after installation, the second annular protrusion fits tightly with the flange by virtue of the extrusion force between the butterfly valve seat and the flange and the elasticity of the second annular protrusion, thereby enhancing the sealing performance and preventing the fluid from leaking in the gap between the valve seat and the flange.

[0013] Furthermore, a plurality of the second annular protrusions are coaxially arranged at intervals.

[0014] Furthermore, a sealing portion is provided on the inner ring surface of the annular body, and the sealing portion includes an arc-shaped recessed portion and arc-shaped raised portions connected on both sides thereof, and the sealing portion is integrally formed with the annular body.

[0015] Beneficial effects:

[0016] The utility model provides an elastic annular convex ring coaxially sleeved on the outer side of an annular body, and the elastic annular convex ring is located between the outer ring surface of the annular body and the inner surface of the valve body. When the inner side of the annular body is worn after the valve plate rotates multiple times, the elasticity of the elastic annular convex ring will push the annular body to press the outer surface of the side of the valve plate to ensure good sealing of the two. Moreover, the tensioning rings on both sides of the annular body can respectively fit with the two end surfaces of the valve body. After the valve seat is installed in the valve body, the tensioning rings on both sides can form a limit in the axial direction to prevent the valve seat from axially moving when the valve plate rotates, thereby ensuring the sealing of the valve seat, extending the service life of the valve seat, and avoiding the impact of frequent replacement of the valve seat on normal production and life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the disassembly of components in the utility model;

[0020] Figure 3 This is a schematic structural diagram for showing the second annular protrusion in Example 2 of the utility model;

[0021] Figure 4 It is a schematic cross-sectional view of the annular body in the utility model along the radial direction;

[0022] Figure 5 It is a schematic structural diagram of the inner ring surface of the annular body of the utility model.

[0023] Explanation of the accompanying drawings: 1-annular body, 2-tensioning ring, 3-valve stem mounting hole, 4-elastic annular convex ring, 5-annular flange, 6-flange through hole, 7-first annular protrusion, 8-second annular protrusion, 9-arc-shaped recessed portion, 10-arc-shaped protruding portion. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Example 1

[0028] A valve seat for a butterfly valve with enhanced sealing, such as Figure 1 As shown, the annular body 1 and the tensioning ring 2 are symmetrically arranged on both sides of the annular body 1. The annular body 1 and the tensioning ring 2 are integrally formed. The annular body 1 is provided with a valve stem mounting hole 3 in the radial direction. The outer side of the annular body 1 is coaxially sleeved with an elastic annular convex ring 4. The elastic annular convex ring 4 is located between the outer ring surface of the annular body 1 and the inner surface of the valve body. The annular body 1 and the tensioning ring 2 are made of fluoroplastics, and the elastic annular convex ring 4 is made of rubber and is pasted on the outer ring surface of the annular body 1. When the inner side of the annular body 1 is worn after the valve plate rotates many times, the elasticity of the elastic annular convex ring 4 will push the annular body 1 to press the outer surface of the side of the valve plate to re-form the seal, which has the advantage of automatic compensation seal, ensuring good sealing of the two, and the tensioning rings 2 on both sides of the annular body 1 can fit with the two end surfaces of the valve body respectively. After the valve seat is installed in the valve body, due to the existence of the tensioning rings on both sides, a limit can be formed in the axial direction to prevent the valve seat from axial movement when the valve plate rotates, thereby ensuring the sealing of the valve seat.

[0029] like Figure 1-2 As shown, the edge of the valve stem mounting hole 3 is provided with an annular flange 5 extending radially outwardly along the annular body 1, and the elastic annular convex ring 4 is provided with a flange through hole 6, and the inner wall of the flange through hole 6 is tightly fitted with the outer wall of the annular flange 5. The annular flange 5 is integrally formed with the annular body 1, and the annular flange 5 can block the gap between the contact surface of the annular body 1 and the elastic annular convex ring 4 to prevent fluid leakage. When no pressure is applied, the thickness of the elastic annular convex ring 4 is greater than the gap between the outer ring surface of the annular body 1 and the inner surface of the valve body, and the thickness of the elastic annular convex ring 4 is equal to the height of the annular flange 5 when no pressure is applied.

[0030] Example 2

[0031] The basic structure is the same as that of Example 1, except that Figure 4 As shown, the inner surface of the valve stem mounting hole 3 is provided with a first annular protrusion 7, and a plurality of first annular protrusions 7 are coaxially spaced to improve the sealing performance of the valve stem and the valve seat and prevent leakage. The first annular protrusion 7 is integrally formed with the valve stem mounting hole 3. When the valve stem is located in the valve stem mounting hole 3, the first annular protrusion 7 (with elasticity) is tightly fitted with the outer surface of the valve stem, which can prevent the fluid from leaking in the gap between the inner wall of the valve stem mounting hole 3 and the valve stem. Figure 3 As shown, a second annular protrusion 8 is provided on the side annular end face of the annular body 1, and a plurality of second annular protrusions 8 are coaxially spaced to increase the sealing performance of the connection between the butterfly valve and the pipes at both ends. The second annular protrusion 8 is integrally formed with the annular body 1. After installation, the second annular protrusion 8 and the flange are tightly fitted by virtue of the extrusion force between the butterfly valve seat and the flange and the elasticity of the second annular protrusion 8, thereby enhancing the sealing performance and preventing the fluid from leaking in the gap between the valve seat and the flange.

[0032] Example 3

[0033] The basic structure is the same as that of Example 2, except that Figure 5 As shown, the inner ring surface of the annular body 1 is provided with a sealing part, which includes an arc-shaped recessed part 9 and arc-shaped raised parts 10 connected on both sides thereof, and the sealing part is integrally formed with the annular body. When the butterfly plate is closed under the drive of the valve stem, the outer edge of the butterfly plate is clamped in the arc-shaped recessed part 9, so that the valve seat and the butterfly plate are sealed, thereby improving the sealing performance of the butterfly valve and preventing fluid leakage.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A valve seat for a butterfly valve with enhanced sealing, characterized in that: It includes an annular body and a tensioning ring symmetrically arranged on both sides of the annular body. The annular body and the tensioning ring are integrally formed. The annular body is provided with a valve stem mounting hole along the radial direction. The outer coaxial sleeve of the annular body is provided with an elastic annular convex ring, and the elastic annular convex ring is located between the outer ring surface of the annular body and the inner surface of the valve body.

2. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: The annular body and the tensioning ring are made of fluoroplastics.

3. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: The elastic annular convex ring is made of rubber and adhered to the outer ring surface of the annular body.

4. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: An annular flange is provided on the edge of the valve stem mounting hole extending radially outward from the annular body, and a flange through hole is provided on the elastic annular convex ring. The inner wall of the flange through hole is tightly fitted with the outer wall of the annular flange.

5. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: When no pressure is applied, the thickness of the elastic annular convex ring is greater than the gap between the outer ring surface of the annular body and the inner surface of the valve body.

6. The valve seat for a butterfly valve with enhanced sealing according to claim 4, characterized in that: The thickness of the elastic annular protrusion is equal to the height of the annular flange when no pressure is applied.

7. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: The inner surface of the valve stem mounting hole is provided with a first annular protrusion.

8. The valve seat for a butterfly valve with enhanced sealing according to claim 7, characterized in that: A plurality of the first annular protrusions are coaxially arranged at intervals.

9. The valve seat for a butterfly valve with enhanced sealing according to claim 1, characterized in that: A second annular protrusion is provided on the side annular end surface of the annular body.

10. The valve seat for a butterfly valve with enhanced sealing according to claim 9, characterized in that: A plurality of the second annular protrusions are coaxially arranged at intervals.

Images