Ball valve sealing structure

Abstract

The utility model provides a ball valve sealing structure, and relates to the technical field of valves. The ball valve comprises a valve body, a ball body arranged in the valve body, a mounting seat arranged at the inlet end of the valve body on the side portion of the ball body, a first valve seat arranged on the mounting seat on the side portion of the ball body, the first valve seat is in a circular ring shape, and a scraper portion in contact with the ball body is arranged on the inner side wall, close to the ball body, of the first valve seat. A plurality of balance grooves are formed in the outer wall of the first valve seat, and the multiple balance grooves are formed in the circumferential outer wall of the first valve seat at equal intervals. The valve seat is prevented from being damaged at the moment of opening and closing.

Description

Technical Field

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

[0002] The opening and closing element of a ball valve is a ball, which is driven by the valve stem and rotates around the axis of the ball valve. It is used for the regulation and control of fluids.

[0003] Currently, the valve seat life of pneumatic ball valves in polycrystalline silicon devices is not long. This is mainly because when the valve is opened or closed, the valve seat loses the support of the ball or is subjected to the pressure of the ball and loses its balance. This can cause the valve seat to move outward or deform locally. The greater the pressure difference before and after the ball, the greater the destructive force on the valve seat. Utility Model Content

[0004] The purpose of this invention is to develop a ball valve sealing structure that prevents the valve seat from being damaged during the opening and closing process.

[0005] This utility model is achieved through the following technical solution:

[0006] A ball valve sealing structure, comprising:

[0007] Valve body;

[0008] A sphere is located inside the valve body;

[0009] The mounting base is located at the valve body inlet end on the side of the ball;

[0010] The first valve seat is located on the mounting base on the side of the ball;

[0011] The first valve seat is annular in shape. A scraper part that contacts the ball is provided on the inner side wall of the first valve seat near the ball. Multiple balance grooves are provided on the outer wall of the first valve seat, and the multiple balance grooves are arranged at equal intervals on the outer circumference of the first valve seat.

[0012] Optionally, the balancing groove is V-shaped and is opened parallel to the axial direction of the first valve seat.

[0013] Optionally, the mounting base is provided with a plurality of retaining strips at the corresponding position to cooperate with the balance groove, and the size of the retaining strips is smaller than that of the balance groove.

[0014] Optionally, the mounting base is annular, and the side wall of the mounting base away from the sphere is a stepped structure. The stepped structure is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

[0015] Optionally, the stepped structure of the mounting base is provided with multiple slots, which are equally spaced on the annular track of the mounting base, and a spring connected to the inner wall of the valve body is provided in each slot.

[0016] Optionally, a compression spring is provided on the side of the first valve seat near the ball, the compression spring is fixed on the inner wall of the valve body, and a first sealing ring is also provided between the first valve seat and the mounting seat.

[0017] Optionally, the ball may also be provided with a second valve seat on the side away from the first valve seat, and a mounting seat that cooperates with the second valve seat is provided at the valve body outlet end of the second valve seat.

[0018] Optionally, the second valve seat is annular, and a scraper portion that contacts the ball is provided on the inner wall of the second valve seat near the ball.

[0019] Optionally, the second valve seat has a pressure ring on its side wall away from the ball that contacts the valve body, and the pressure ring has a second sealing ring on its side away from the second valve seat that contacts both the second valve seat and the valve body.

[0020] Optionally, a disc spring is provided on the side of the second valve seat away from the ball, and the disc spring is located between the valve body and the second valve seat.

[0021] The beneficial effects of this utility model are:

[0022] In addition to the main seal, this utility model also has a secondary seal, which improves the sealing performance of the ball valve. Multiple balance grooves are evenly distributed on the first valve seat. When the valve opening and closing causes the first valve seat to lose balance, the balance grooves allow the first valve seat to deform evenly as a whole, avoiding excessive local stress that could lead to outward displacement or deformation. Furthermore, the retaining strips that are inserted into the balance grooves help the first valve seat to recover its shape. The size of the retaining strips is smaller than that of the balance grooves, giving the first valve seat a certain amount of elastic deformation space. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 Main sealing structure diagram;

[0025] Figure 2 This is a diagram of the secondary sealing structure.

[0026] Reference numerals in the attached drawings: 1. Valve body; 2. Ball; 3. Mounting seat; 4. Groove; 5. Spring; 6. Sealing ring; 7. First sealing ring; 8. Compression spring; 9. First valve seat; 10. Retaining strip; 11. Balance groove; 12. Second valve seat; 13. Pressure ring; 14. Second sealing ring; 15. Disc spring. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0028] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, this utility model discloses a ball valve sealing structure, including a valve body 1, a ball 2 serving as a plug body inside the valve body 1, mounting seats 3 respectively provided on both sides of the ball 2 inside the valve body 1, a main seal provided on the mounting seat 3 at the inlet end of the valve body 1, and a secondary seal provided on the mounting seat 3 at the outlet end of the valve body 1.

[0031] The mounting base 3 is annular, and the side wall of the mounting base 3 away from the ball 2 is stepped. Multiple slots 4 are provided on the stepped structure, and these slots 4 are evenly spaced along the annular trajectory of the mounting base 3. A spring 5, connected to the inner wall of the valve body 1, is installed within each slot 4. The spring force of the spring 5 is the pushing force applied by the mounting base 3 towards the ball 2. A sealing groove is also provided on the stepped structure, and a sealing ring 6 is installed within the sealing groove.

[0032] The main seal includes a first valve seat 9 located on the side wall of the mounting base 3 near the ball 2. The first valve seat 9 is annular and made of RPTFE (polytetrafluoroethylene glass fiber). A scraper portion that contacts the ball 2 is provided on the inner side wall of the first valve seat 9 near the ball 2. A first sealing ring 7 is also provided between the first valve seat 9 and the mounting base 3. A compression spring 8 is provided on the side of the first valve seat 9 near the ball 2, and the compression spring 8 is fixed to the inner wall of the valve body 1.

[0033] Four balancing grooves 11 are provided on the outer wall of the first valve seat 9. The four balancing grooves 11 are arranged at equal intervals on the circumferential outer wall of the first valve seat 9. The balancing grooves 11 are V-shaped and are parallel to the axial direction of the first valve seat 9. The mounting base 3 is provided with four retaining strips 10 at corresponding positions to cooperate with the balancing grooves 11. The four retaining strips 10 are respectively inserted into the four balancing grooves 11. The size of the retaining strips 10 is smaller than that of the balancing grooves 11, that is, the thickness of the retaining strips 10 is smaller than the depth of the balancing grooves 11, and the width of the retaining strips 10 is smaller than the top opening of the balancing grooves 11.

[0034] The secondary seal includes a second valve seat 12 disposed on the side wall of the mounting base 3 near the ball 2. The second valve seat 12 is annular, and a scraper portion that contacts the ball 2 is provided on the inner side wall of the second valve seat 12 near the ball 2. A pressure ring 13 that contacts the valve body 1 is provided on the side wall of the second valve seat 12 away from the ball 2. A second sealing ring 14 that contacts the second valve seat 12 and the valve body 1 is provided on the side of the pressure ring 13 away from the second valve seat 12. A disc spring 15 is also provided on the side of the second valve seat 12 away from the ball 2, and the disc spring 15 is disposed between the valve body 1 and the second valve seat 12.

[0035] In addition to the main seal, this utility model also has a secondary seal, which improves the sealing performance of the ball valve. Multiple balance grooves 11 are evenly provided on the first valve seat 9. When the valve opening and closing causes the first valve seat 9 to lose balance, the balance grooves 11 allow the first valve seat 9 to deform evenly as a whole, avoiding excessive local force that could cause outward displacement or deformation. Furthermore, the retaining strips 10 that are inserted into the balance grooves 11 help the first valve seat 9 to recover its shape. The size of the retaining strips 10 is smaller than that of the balance grooves 11, which gives the first valve seat 9 a certain elastic deformation space.

[0036] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A ball valve sealing structure, characterized in that, include: Valve body; A sphere is located inside the valve body; The mounting base is located at the valve body inlet end on the side of the ball; The first valve seat is located on the mounting base on the side of the ball; The first valve seat is annular in shape. A scraper part that contacts the ball is provided on the inner side wall of the first valve seat near the ball. Multiple balance grooves are provided on the outer wall of the first valve seat, and the multiple balance grooves are arranged at equal intervals on the outer circumference of the first valve seat.

2. The ball valve sealing structure according to claim 1, characterized in that, The balancing groove is V-shaped and is opened parallel to the axial direction of the first valve seat.

3. The ball valve sealing structure according to claim 2, characterized in that, The mounting base is provided with multiple retaining strips at corresponding positions that cooperate with the balance groove, and the size of the retaining strips is smaller than that of the balance groove.

4. The ball valve sealing structure according to claim 1, characterized in that, The mounting base is annular, and the side wall of the mounting base away from the sphere is a stepped structure. A sealing groove is provided on the stepped structure, and a sealing ring is provided in the sealing groove.

5. The ball valve sealing structure according to claim 4, characterized in that, The stepped structure of the mounting base has multiple slots, which are equally spaced on the annular track of the mounting base. Each slot contains a spring that connects to the inner wall of the valve body.

6. The ball valve sealing structure according to claim 1, characterized in that, The first valve seat is provided with a compression spring on the side near the ball, and the compression spring is fixed to the inner wall of the valve body. A first sealing ring is also provided between the first valve seat and the mounting seat.

7. The ball valve sealing structure according to any one of claims 1 to 6, characterized in that, The ball is provided with a second valve seat on the side away from the first valve seat, and a mounting seat that cooperates with it is provided at the valve body outlet end of the second valve seat.

8. The ball valve sealing structure according to claim 7, characterized in that, The second valve seat is annular, and a scraper part that contacts the ball is provided on the inner wall of the second valve seat near the ball.

9. The ball valve sealing structure according to claim 8, characterized in that, The second valve seat has a pressure ring on its side wall away from the ball that contacts the valve body, and a second sealing ring is provided on the side of the pressure ring away from the second valve seat that contacts both the second valve seat and the valve body.

10. The ball valve sealing structure according to claim 8, characterized in that, The second valve seat is provided with a disc spring on the side away from the ball, and the disc spring is located between the valve body and the second valve seat.

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