Self-lubricating high-pressure-resistant sealing valve seat

Abstract

The self-lubricating high-pressure-resistant sealing valve seat comprises a valve seat assembly, the valve seat assembly comprises an annular framework and a polymer elastomer, the polymer elastomer and the annular framework are arranged in a matched mode, the polymer elastomer is wrapped outside the annular framework, and the face, making contact with a valve ball, of the polymer elastomer is provided with a coating face. And a polytetrafluoroethylene coating is coated on the coating surface. The ball valve has the advantages that a novel mechanical structure is utilized, the service life is prolonged, using noise is reduced, and the rotating smoothness of the valve ball is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing valve seat technology, and in particular to a self-lubricating, high-pressure resistant sealing valve seat. Background Technology

[0002] A Chinese patent with publication number CN201944322U discloses a hard ball valve, comprising a left valve body and a right valve body connected to each other. The left and right valve bodies are provided with a medium flow channel. A ball is rotatably installed in the left valve body to open and close the medium flow channel. A left valve seat assembly and a right valve seat assembly are installed in the medium flow channel to seal against the ball. The sealing spherical surface of the ball that contacts the left and right valve seat assemblies, the sealing surface of the left valve seat assembly, and the sealing surface of the right valve seat assembly are all coated with a hard alloy layer.

[0003] However, the ball valve mentioned above has the following disadvantages: the ball body is sealed on both sides by the left valve seat assembly and the right valve seat assembly, respectively. However, the friction area between the valve seat assembly and the ball body is large, and the driving force required for the rotation of the ball is large, which is not labor-saving and urgently needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide a self-lubricating, high-pressure resistant sealing valve seat, which has the effects of extending service life, reducing noise during use, and improving the smoothness of valve ball rotation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a self-lubricating, high-pressure resistant sealing valve seat, comprising a valve seat assembly, wherein the valve seat assembly comprises an annular skeleton and a polymer elastomer, wherein the polymer elastomer is adapted to the annular skeleton and the polymer elastomer is wrapped around the annular skeleton, and the side of the polymer elastomer that contacts the valve ball is provided with a coating surface, wherein the coating surface is coated with a polytetrafluoroethylene coating.

[0006] By adopting the above technical solution, when the valve ball rotates relative to the valve seat assembly, the outer wall of the valve ball is in direct contact with the surface of the polytetrafluoroethylene coating. Utilizing the wear resistance and high self-lubricating properties of the polytetrafluoroethylene coating, the service life of this utility model can be extended, while reducing the friction between the valve ball and the valve seat assembly, thereby reducing operating noise and improving the smoothness of valve ball rotation. The addition of the annular skeleton can improve the structural strength of this utility model, enabling the sealing valve seat of this utility model to withstand higher water pressure, while the polymer elastic element can buffer and dampen the shaking generated when the valve ball rotates, thus achieving the effects of extending service life, reducing operating noise, and improving the smoothness of valve ball rotation.

[0007] A further feature of this invention is that the polymer elastomer has an inner ring wall and an outer ring wall, the coating surface is inclined from the outer ring wall toward the inner ring wall, and the polymer elastomer has an annular protrusion on the coating surface, the annular protrusion being located between the inner ring wall and the outer ring wall.

[0008] By adopting the above technical solution, the annular protrusion can further reduce the contact area between the valve seat assembly and the valve ball, and improve the flexibility of the valve ball rotation.

[0009] A further feature of this invention is that the polytetrafluoroethylene coating includes a contact section covering the annular protrusion and an extension section located on both sides of the annular protrusion and covering the coating surface.

[0010] By adopting the above technical solution, when the valve ball rotates, the outer wall of the valve ball contacts and slides with the polytetrafluoroethylene coating in the contact section area. The extension section can provide structural support for both sides of the contact section, thereby improving the connection strength of the polytetrafluoroethylene coating on the polymer elastomer.

[0011] A further feature of this invention is that the outer wall of the contact segment is an arc-shaped surface, and the contact segment contacts the outer wall of the valve ball through the arc-shaped surface.

[0012] By adopting the above technical solution, the outer wall of the arc-shaped contact section can prevent the valve ball from getting stuck or scratched when rotating, thereby improving the sensitivity of the valve ball rotation.

[0013] A further feature of this invention is that the material of the polymer elastomer is rubber.

[0014] A further feature of this invention is that the cross-section of the annular skeleton is L-shaped, the polymer elastomer forms an annular cavity corresponding to the annular skeleton, and the annular skeleton is housed within the annular cavity.

[0015] By adopting the above technical solution, the L-shaped annular skeleton has better structural support and can improve the deformation resistance of the valve seat assembly.

[0016] A further feature of this invention is that the annular skeleton includes an integrally formed radial extension segment and an axial extension segment, wherein the radial extension segment extends toward the inner ring wall relative to the axial extension segment.

[0017] By adopting the above technical solution, the L-shaped annular skeleton is adapted to the inclined direction of the coating surface, and the structural layout is reasonable, which is conducive to improving the structural strength of the valve seat assembly in the axial and radial directions.

[0018] A further feature of this invention is that the material of the ring skeleton is cold-rolled low-carbon steel.

[0019] By adopting the above technical solution, the ring skeleton made of cold-rolled low-carbon steel has excellent structural strength and toughness, and can work normally in high-intensity working environments.

[0020] A further feature of this invention is that the polymer elastomer has a plurality of slots on the inner ring wall, the plurality of slots being located on the side of the polymer elastomer away from the coating surface, and the plurality of slots being evenly distributed circumferentially on the inner ring wall.

[0021] A further feature of this invention is that the polymer elastomer has a plurality of positioning protrusions on its outer wall, and the plurality of positioning protrusions are distributed at equal intervals along the circumference on the outer ring wall.

[0022] In summary, this utility model has the following beneficial effects:

[0023] The device employs a method of wrapping a layer of polymer elastomer around an annular skeleton, and then coating the surface of the polymer elastomer that contacts the valve ball with a polytetrafluoroethylene (PTFE) coating. When the valve ball rotates relative to the valve seat assembly, the outer wall of the valve ball is in direct contact with the PTFE coating surface. Utilizing the wear resistance and high self-lubricating properties of the PTFE coating, the service life of this device can be extended, while reducing the friction between the valve ball and the valve seat assembly, thereby reducing operating noise and improving the smoothness of valve ball rotation. The addition of the annular skeleton can improve the structural strength of this device, enabling the sealing valve seat to withstand higher water pressure, while the polymer elastomer can buffer and dampen the shaking generated during valve ball rotation, thus extending service life, reducing operating noise, and improving the smoothness of valve ball rotation. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of the present invention.

[0025] Figure 2 This is a front view of the present invention.

[0026] Figure 3 This is a utility model Figure 2 A sectional view of section AA in the middle.

[0027] Figure 4 This is a utility model Figure 3 A magnified view of a portion of region B in the middle.

[0028] Figure 5 This is a cross-sectional view of the valve seat assembly of this utility model when it is assembled and used in the valve body.

[0029] In the diagram: 1. Valve seat assembly; 2. Annular skeleton; 21. Radial extension section; 22. Axial extension section; 3. Polymer elastomer; 30. Annular chamber; 31. Inner ring wall; 32. Outer ring wall; 33. Annular protrusion; 34. Slot; 35. Positioning protrusion; 4. PTFE coating; 41. Contact section; 411. Arc-shaped surface; 42. Extension section; 5. Valve body; 51. Valve ball; 52. Slot; 53. Positioning groove; 54. Valve stem. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] A self-lubricating, high-pressure resistant sealing valve seat, such as Figures 1-5 As shown, the valve includes a valve seat assembly 1, which comprises an annular skeleton 2 and a polymer elastomer 3. The polymer elastomer 3 is adapted to the annular skeleton 2 and is wrapped around the annular skeleton 2. The side of the polymer elastomer 3 that contacts the valve ball 51 has a coating surface, which is coated with a polytetrafluoroethylene coating 4. The polymer elastomer 3 has an inner ring wall 31 and an outer ring wall 32. The coating surface is inclined from the outer ring wall 32 toward the inner ring wall 31, and the polymer elastomer 3 has an annular protrusion 33 on the coating surface. The protrusion 33 is located between the inner ring wall 31 and the outer ring wall 32. The annular protrusion 33 can further reduce the contact area between the valve seat assembly 1 and the valve ball 51 and improve the flexibility of the valve ball 51 rotation. The polymer elastomer 3 is made of rubber, and the rubber is made of synthetic rubber. In this embodiment, the synthetic rubber is EPDM (ethylene propylene diene monomer rubber). The annular skeleton 2 is made of cold-rolled low-carbon steel. The annular skeleton 2 made of cold-rolled low-carbon steel has excellent structural strength and toughness and can work normally under high-intensity working environment.

[0032] like Figures 1-3 and Figure 5The diagram shows the internal layout of the valve seat assembly 1 installed within the valve body 5 in this embodiment. The valve body 5 has a valve cavity containing a valve ball 51. Valve seat assemblies 1 are arranged at both the top and bottom of the valve cavity, and these two valve seat assemblies 1 are used to seal against the upper and lower ends of the valve ball 51. The valve body 5 has a valve stem 54, one end of which rotates the valve body 5 within the valve cavity, controlling the water flow opening of the valve body 5. In this embodiment, the valve seat assembly 1 is an annular component. The polymer elastomer 3 has several grooves 34 on its inner ring wall 31. These grooves 34 are located on the polymer elastomer 3 away from the coating. On one side of the cover, several slots 34 are evenly distributed around the inner ring wall 31. In addition, several protrusions 52 are provided on the side of the valve cavity. Correspondingly, the polymer elastomer 3 of this embodiment has several positioning protrusions 35 on its outer wall. The several positioning protrusions 35 are evenly distributed around the outer ring wall 32. When the valve seat assembly 1 of this embodiment is installed in the valve body 5, the positioning groove 53 is positioned and engaged with the positioning protrusions 35 on the side of the polymer elastomer 3, and the protrusions 52 are engaged and positioned with the slots 34 on the side of the polymer elastomer 3, so that the valve seat assembly 1 is fixed and installed in the valve cavity.

[0033] like Figures 3-5 As shown, the polytetrafluoroethylene coating 4 includes a contact section 41 covering the annular protrusion 33 and extension sections 42 located on both sides of the annular protrusion 33 and covering the coating surface. When the valve ball 51 rotates, the outer wall of the valve ball 51 contacts and slides with the polytetrafluoroethylene coating 4 in the area of ​​the contact section 41. The extension sections 42 can provide structural support for both sides of the contact section 41, improving the connection strength of the polytetrafluoroethylene coating 4 on the polymer elastomer 3. The outer wall of the contact section 41 is set as an arc-shaped surface 411. The contact section 41 contacts the outer wall of the valve ball 51 through the arc-shaped surface 411. The arc-shaped outer wall of the contact section 41 can prevent the valve ball 51 from getting stuck or scratching when rotating. In the case of damage, the sensitivity of the valve ball 51 rotation is improved; the cross section of the annular skeleton 2 is L-shaped, and the polymer elastomer 3 forms an annular chamber 30 corresponding to the annular skeleton 2. The annular skeleton 2 is built into the annular chamber 30. The annular skeleton 2 with an L-shaped cross section has better structural support and can improve the deformation resistance of the valve seat assembly 1; the annular skeleton 2 includes an integrally set radial extension section 21 and axial extension section 22. The radial extension section 21 extends towards the inner ring wall 31 relative to the axial extension section 22. The L-shaped annular skeleton 2 is set to adapt to the inclined direction of the coating surface. The structural layout is reasonable and conducive to improving the structural strength of the valve seat assembly 1 in the axial and radial directions.

[0034] The basic working principle of this utility model is as follows: a layer of polymer elastomer 3 is wrapped around the annular skeleton 2, and a polytetrafluoroethylene coating 4 is coated on the coating surface of the polymer elastomer 3 that contacts the valve ball 51. When the valve ball 51 rotates relative to the valve seat assembly 1, the outer wall of the valve ball 51 is in direct contact with the surface of the polytetrafluoroethylene coating 4. By utilizing the wear resistance and high self-lubricating properties of the polytetrafluoroethylene coating 4, the service life of this utility model can be extended, while reducing the friction between the valve ball 51 and the valve seat assembly 1, thereby reducing the noise during use and improving the smoothness of the rotation of the valve ball 51. The addition of the annular skeleton 2 can improve the structural strength of this utility model, enabling the sealing valve seat of this utility model to withstand higher water pressure, while the polymer elastomer can buffer and dampen the shaking generated when the valve ball 51 rotates, thus extending the service life, reducing the noise during use, and improving the smoothness of the valve ball rotation.

[0035] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A self-lubricating, high-pressure resistant sealing valve seat, comprising a valve seat assembly (1), characterized in that: The valve seat assembly (1) includes an annular skeleton (2) and a polymer elastomer (3). The polymer elastomer (3) is adapted to the annular skeleton (2) and is wrapped around the annular skeleton (2). The side of the polymer elastomer (3) that contacts the valve ball is provided with a coating surface, and the coating surface is coated with a polytetrafluoroethylene coating (4).

2. The self-lubricating, high-pressure resistant sealing valve seat according to claim 1, characterized in that: The polymer elastomer (3) has an inner ring wall (31) and an outer ring wall (32). The coating surface is inclined from the outer ring wall (32) toward the inner ring wall (31). The polymer elastomer (3) has an annular protrusion (33) on the coating surface, and the annular protrusion (33) is located between the inner ring wall (31) and the outer ring wall (32).

3. The self-lubricating, high-pressure resistant sealing valve seat according to claim 2, characterized in that: The polytetrafluoroethylene coating (4) includes a contact section (41) covering the annular protrusion (33) and an extension section (42) located on both sides of the annular protrusion (33) and covering the coating surface.

4. A self-lubricating, high-pressure resistant sealing valve seat according to claim 3, characterized in that: The outer wall of the contact section (41) is provided as an arc-shaped surface (411), and the contact section (41) contacts the outer wall of the valve ball through the arc-shaped surface (411).

5. A self-lubricating, high-pressure resistant sealing valve seat according to claim 1, characterized in that: The polymer elastomer (3) is made of rubber.

6. The one according to claim 2, characterized in that: The cross-section of the annular skeleton (2) is L-shaped, and the polymer elastomer (3) forms an annular chamber (30) corresponding to the annular skeleton (2), with the annular skeleton (2) being built into the annular chamber (30).

7. A self-lubricating, high-pressure resistant sealing valve seat according to claim 6, characterized in that: The annular frame (2) includes an integrally formed radial extension section (21) and an axial extension section (22), wherein the radial extension section (21) extends toward the inner ring wall (31) relative to the axial extension section (22).

8. A self-lubricating, high-pressure resistant sealing valve seat according to claim 1, characterized in that: The ring frame (2) is made of cold-rolled low-carbon steel.

9. A self-lubricating, high-pressure resistant sealing valve seat according to claim 2, characterized in that: The polymer elastomer (3) has a plurality of slots (34) on the inner ring wall (31). The plurality of slots (34) are located on the side of the polymer elastomer (3) away from the coating surface, and the plurality of slots (34) are evenly distributed on the inner ring wall (31) in the circumferential direction.

10. A self-lubricating, high-pressure resistant sealing valve seat according to claim 2, characterized in that: The polymer elastomer (3) has a plurality of positioning protrusions (35) protruding on the outer wall, and the plurality of positioning protrusions (35) are distributed at equal intervals along the circumference on the outer ring wall (32).

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