Sealing device of ball valve moving ring

Abstract

The utility model discloses a sealing device of a ball valve moving ring, which comprises a moving ring sliding in a valve body, a sealing piece is arranged between the moving ring and the valve body, the sealing piece comprises a first sealing ring and a second sealing ring connected with the first sealing ring, the sealing piece is arranged in the moving ring, the first sealing ring is in contact with the valve body, and the second sealing ring is in contact with the valve body. Or the sealing piece is arranged in the valve body, the first sealing ring is in contact with the movable ring, the abrasion resistance of the first sealing ring is higher than that of the second sealing ring, and the elasticity of the second sealing ring is higher than that of the first sealing ring. Compared with the prior art, the sealing element is of a double-layer combined structure, after the first sealing ring is abraded, the second sealing ring with good elasticity can compensate the first sealing ring in time, it is ensured that the sealing effect of the sealing element is not affected, and the service life of the sealing element is prolonged. Furthermore, the abraded first sealing ring is good in abrasion resistance, the service life of the sealing piece can be further prolonged, and the maintenance frequency is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve sealing technical field especially is a kind of sealing device of ball valve moving ring. BACKGROUND

[0002] The moving ring of large-diameter ball valve is extruded to valve core by axial reciprocating motion, radial deformation is generated, and close adhesion with valve core surface is realized.The contact between moving ring and valve core only occurs when closing, and moving ring and valve core are separated during opening and closing process, which avoids the continuous friction of traditional rotary sealing, reduces the wear of moving ring and prolongs the service life.However, the sealing device for sealing the moving ring is prone to wear during the reciprocating motion of the moving ring, which affects the sealing performance of the sealing device and increases the maintenance frequency of the ball valve. SUMMARY

[0003] (1) technical problem to be solved

[0004] Therefore, the utility model provides a kind of sealing device of ball valve moving ring to solve the problem that the sealing device of prior art is prone to wear during the reciprocating motion of the moving ring, which reduces the sealing performance.

[0005] (2) technical scheme

[0006] The utility model discloses a kind of sealing devices of ball valve moving ring to solve the problem that the sealing device of prior art is prone to wear during the reciprocating motion of the moving ring, which reduces the sealing performance.

[0007] Preferably, the first sealing ring is provided with a positioning groove matched with the second sealing ring.

[0008] Preferably, the first sealing ring is circular in cross section.

[0009] Preferably, the second sealing ring is two.

[0010] Preferably, the first sealing ring is provided with two convex rings.

[0011] Preferably, the first sealing ring is provided with a first groove on both sides.

[0012] Preferably, the second sealing ring is made of nitrile rubber material.

[0013] Preferably, the first sealing ring is made of polyether polyurethane material.

[0014] Preferably, the moving ring is L-shaped structure, the corner of the moving ring is provided with a first oil cavity, and the rear end of the moving ring is provided with a second oil cavity.

[0015] Preferably, two groups of sealing members are distributed on the outer side of the moving ring, and the first oil cavity is arranged between the two groups of sealing members.

[0016] (Three) beneficial effects

[0017] The sealing device of the ball valve moving ring has the following advantages:

[0018] In the utility model, the sealing member adopts double-layer combined structure, after the first sealing ring is abraded, the second sealing ring with good elasticity can compensate the first sealing ring in time, ensures that the sealing effect of the sealing member is not affected, and is beneficial to prolong the service life of the sealing member. Further, the first sealing ring abraded has good wear resistance, can further prolong the service life of the sealing member, and reduces the maintenance frequency. BRIEF DESCRIPTION OF DRAWINGS

[0019] The features and advantages of the present application will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, which are given by way of illustration and are not to be construed as limiting the present application, in which:

[0020] Figure 1 is a structural schematic view of the utility model;

[0021] Figure 2 is Figure 1 is an enlarged schematic view of structure A in the middle.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1. valve body, 2. moving ring, 3. sealing member, 31. first sealing ring, 32. second sealing ring, 311. positioning groove, 312. convex ring, 313. first recess, 4. first oil cavity, 5. second oil cavity, 6. valve core. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiment of the utility model is described in detail below in conjunction with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific implementation.

[0025] Refer to the drawings Figure 1The embodiment provides a sealing device of a moving ring of a ball valve, which comprises a moving ring 2 sliding in a valve body 1, the moving ring 2 is close to or away from a valve core 6 in a sliding mode, a sealing element 3 is arranged between the moving ring 2 and the valve body 1, the sealing element 3 is used for sealing the moving ring 2 and the valve body 1, the sealing element 3 comprises a first sealing ring 31 and a second sealing ring 32 connected with the first sealing ring 31, in one implementation, the sealing element 3 is arranged in the moving ring 2 and the first sealing ring 31 is in contact with the valve body 1, when the moving ring 2 moves, the first sealing ring 31 is rubbed with the valve body 1, in another implementation, the sealing element 3 is arranged in the valve body 1 and the first sealing ring 31 is in contact with the moving ring 2, when the moving ring 2 moves, the first sealing ring 31 is rubbed with the moving ring 2. The wear resistance of the first sealing ring 31 is higher than that of the second sealing ring 32, and the elasticity of the second sealing ring 32 is higher than that of the first sealing ring 31. The moving ring 2 and the valve body 1 are sealed through the sealing element 3, in the moving process of the moving ring 2, the first sealing ring 31 will be worn due to friction, which will affect the sealing performance of the first sealing ring 31, but the second sealing ring 32 can compensate the first sealing ring 31 elastically to ensure that the sealing performance of the first sealing ring 31 remains unchanged, the service life of the sealing element 3 can be prolonged, and the maintenance frequency is reduced. In this process, the first sealing ring 31 has good wear resistance, and the service life of the sealing element 3 can be further improved. The second sealing ring 32 has good elasticity, can compensate the first sealing ring 31 after wear in time, and ensures that the sealing effect of the sealing element 3 is not affected.

[0026] Specifically, the moving ring 2 is provided with a mounting groove, and the sealing element 3 is arranged in the mounting groove, and specifically, the second sealing ring 32 is arranged between the moving ring 2 and the first sealing ring 31, and the first sealing ring 31 is arranged between the second sealing ring 32 and the valve body 1.

[0027] One mounting mode of the second sealing ring 32 and the first sealing ring 31 is that the first sealing ring 31 is arranged in the mounting groove of the moving ring 2. Figure 2 Part of the second sealing ring 32 is located in the positioning groove 311 of the first sealing ring 31, so that the second sealing ring 32 is prevented from changing position in the sliding process of the moving ring 2.

[0028] As another implementation of the utility model, the cross section of the first sealing ring 31 is circular, and the positioning groove 311 is an arc-shaped groove.

[0029] Specifically, the second sealing ring 32 is two.

[0030] As another implementation of the utility model, the first sealing ring 31 is provided with two convex rings 312, and the two convex rings 312 can improve the sealing performance by one time.

[0031] As another implementation form of the utility model: two sides of the first sealing ring 31 are respectively equipped with the first groove 313.

[0032] Specifically, the second sealing ring 32 is made of butyronitrile rubber material, and the butyronitrile rubber material has the characteristics of excellent sealing performance, good elasticity, large compensation and the like.

[0033] Specifically, the first sealing ring 31 is made of polyether polyurethane material, and the polyether polyurethane material has the characteristics of high wear resistance, high load bearing, good guiding, low friction, small resistance, stable action and long service life.

[0034] As another implementation form of the utility model: the moving ring 2 is of L-shaped structure, the first oil cavity 4 is arranged at the corner of the moving ring 2, the first oil passage is arranged on the valve body 1 and communicated with the first oil cavity 4, the second oil cavity 5 is arranged at the rear end of the moving ring 2, and the second oil passage is arranged on the valve body 1 and communicated with the second oil cavity 5. The first oil cavity 4 is filled with oil to push the moving ring 2 to move backward, the moving ring 2 is separated from the valve core 6, the valve core 6 is rotated to the opening position to open the valve, and the moving ring 2 is not abraded. After the valve core 6 is rotated to the closing position, the second oil cavity 5 is filled with oil to push the moving ring 2 to move forward and be pressed with the valve core 6, and the ball valve closing action is completed.

[0035] As another implementation form of the utility model: two groups of sealing members 3 are distributed on the outer side of the moving ring 2, and the first oil cavity 4 is arranged between the two groups of sealing members 3. The structure design is beneficial to the sealing performance of the outer side of the moving ring 2. One group of sealing members 3 is distributed on the inner side of the moving ring 2, and the number of sealing members 3 in the three groups of sealing members 3 is two.

[0036] As another implementation form of the utility model: a copper-aluminum alloy layer is arranged on the contact surface between the moving ring 2 and the valve body 1. In the structure design, the contact surface is not rusted, has good wear resistance, small friction, and small gap change between the moving ring 2 and the valve body 1.

[0037] As another implementation form of the utility model: the valve body 1 comprises a shell and a supporting ring, the moving ring 2 is slidably arranged between the shell and the supporting ring, the second oil cavity 5 is arranged between the supporting ring and the moving ring 2, and the supporting ring is made of stainless steel material.

[0038] Finally, the method of the utility model is only a preferred implementation form, and is not used for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0039] Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the utility model, and such modifications and changes all fall within the scope defined by the appended claims.

Claims

1. A sealing device for a ball valve traveling ring, characterized by The application relates to a valve body, which comprises a moving ring sliding in the valve body, a sealing element arranged between the moving ring and the valve body, the sealing element comprising a first sealing ring and a second sealing ring connected with the first sealing ring, the sealing element being arranged in the moving ring and the first sealing ring being in contact with the valve body, or the sealing element being arranged in the valve body and the first sealing ring being in contact with the moving ring, the wear resistance of the first sealing ring being higher than that of the second sealing ring, and the elasticity of the second sealing ring being higher than that of the first sealing ring.

2. The sealing device of a ball valve moving ring according to claim 1, characterized in that, The first sealing ring is provided with a positioning groove matched with the second sealing ring.

3. A seal for a ball valve traveling ring as defined in claim 2 wherein, The first sealing ring is circular in cross section.

4. The seal apparatus for a ball valve traveling ring according to claim 3, wherein The second sealing ring is two.

5. A seal for a ball valve traveling ring as defined in claim 4 wherein, The first sealing ring is provided with two convex rings.

6. A seal for a ball valve traveling ring as defined in claim 5 wherein, The first sealing ring is provided with a first groove on each side.

7. A seal for a ball valve traveling ring as defined in claim 6 wherein, The second sealing ring is made of butyronitrile rubber.

8. A seal for a ball valve traveling ring as defined in claim 7, wherein, The first sealing ring is made of polyether polyurethane.

9. A seal for a ball valve traveling ring as defined in claim 8 wherein, The moving ring is L-shaped, the first oil cavity is arranged at the corner of the moving ring, and the second oil cavity is arranged at the rear end of the moving ring.

10. A seal for a ball valve traveling ring as defined in claim 9 wherein, Two groups of sealing elements are distributed on the outer side of the moving ring, and the first oil cavity is arranged between the two groups of sealing elements.

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