Ball valve sealing structure

Abstract

The utility model provides a ball valve sealing structure, and belongs to the technical field of valve manufacturing. The problem that an existing ball valve is inconvenient to assemble is solved. The ball valve sealing structure comprises a valve body, a valve cover and a valve ball, the valve body is in threaded connection with the valve cover, the valve ball is located in the valve body, a first step is arranged in the valve body, a first gasket abutting against the valve ball is arranged on the first step, a second step is arranged in the valve cover, and a second gasket abutting against the valve ball is arranged on the second step. A first step face, abutting against the outer end face of the first gasket, of the first step is provided with an annular concave first annular groove, a first sealing ring with the outer diameter larger than the depth of the first annular groove is arranged in the first annular groove, the first sealing ring abuts against the outer end face of the second gasket, and a second step face, abutting against the outer end face of the second gasket, of the second step is provided with an annular concave second annular groove. A second sealing ring with the outer diameter larger than the depth of the second annular groove is arranged in the second annular groove and abuts against the outer end face of the second gasket. The utility model has the advantages of stable structure, convenient manufacture, high qualified rate and the like.

Description

Technical Field

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

[0002] To ensure sealing, ball valves currently feature sealing structures on both sides of the valve ball. For example, Chinese patent literature discloses a sealing structure for an electric ball valve [Application No.: 202220555259.2; Authorization Announcement No.: CN216895885U], which includes a tubular valve cover with both ends connected. One end of the outer wall of the valve cover has an external thread that matches the internal thread on the inner wall of the valve body. A step is provided on the inner wall of the valve cover, and a washer that abuts against the valve ball inside the valve body is installed on the step. The step and the washer are sealed by a first O-ring. An annular groove for accommodating a second O-ring is formed at the root of the external thread. The depth of the annular groove is less than the wire diameter of the second sealing ring, and its groove shape matches the second sealing ring. The outer side of the second sealing ring abuts against the inner wall of the valve body.

[0003] The aforementioned electric ball valve sealing structure, through the setting of the first and second sealing rings, ensures good sealing on both sides of the valve ball, preventing media leakage. However, for the positioning of the first sealing ring, the outer end face of the gasket needs to be machined with an annular groove that matches the outer diameter of the first sealing ring. This places high demands on the gasket material and is difficult to process, resulting in a low yield. Moreover, during assembly, the gasket can easily squeeze out the first sealing ring, making assembly inconvenient. In addition, after assembly, the force exerted by the first sealing ring on the gasket of each ball valve is not consistent. When the force is too large, it increases the torque of the valve ball, increases the wear of the gasket, and shortens its service life. When the force is too small, the sealing between the gasket and the ball valve is poor, affecting the performance. The direction of the force exerted by the first sealing ring on the gasket of each ball valve is also not consistent, which will lead to different contact areas and stress points between the gasket and the valve ball, resulting in inconsistent gasket wear and service life of each product, reducing the product qualification rate. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a ball valve sealing structure that offers good structural stability, ease of manufacturing, high pass rate, and good product consistency.

[0005] The objective of this utility model can be achieved through the following technical solution: A ball valve sealing structure includes a valve body, a valve cover, and a valve ball. The valve body and the valve cover are threadedly connected. The valve ball is located inside the valve body. The valve body has a first step, and a first washer that abuts against the valve ball is provided on the first step. The valve cover has a second step, and a second washer that abuts against the valve ball is provided on the second step. The characteristic feature is that the first step, where the outer end face of the first washer abuts, has an annular and recessed annular groove. A sealing ring with an outer diameter greater than the depth of the annular groove is provided in the first annular groove, and the sealing ring abuts against the outer end face of the second washer. The second step, where the outer end face of the second washer abuts, has an annular and recessed annular groove. A sealing ring with an outer diameter greater than the depth of the annular groove is provided in the second annular groove, and the sealing ring abuts against the outer end face of the second washer.

[0006] In the ball valve sealing structure described above, the outer diameter of the first annular groove is equal to the inner diameter of the inner wall of the valve body where the outer wall of the first gasket abuts, and the outer diameter of the second annular groove is equal to the inner diameter of the inner wall of the valve cover where the outer wall of the second gasket abuts.

[0007] In the ball valve sealing structure described above, the inner diameter of gasket one is less than or equal to the inner diameter of step one, and the inner diameter of gasket two is less than or equal to the inner diameter of step two.

[0008] In the ball valve sealing structure described above, the inner and outer edges of the contact surfaces of both gasket one and gasket two that abut against the valve ball are rounded.

[0009] Compared with existing technologies, this ball valve sealing structure is easy to assemble, convenient to manufacture, lower in cost, and has good structural stability, good product consistency, and a high pass rate. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the sealing structure of this ball valve.

[0011] In the diagram, 1. Valve body; 2. Valve cover; 3. Valve ball; 4. Step 1; 5. Gasket 1; 6. Step 2; 7. Gasket 2; 8. Annular groove 1; 9. Sealing ring 1; 10. Annular groove 2; 11. Sealing ring 2. Detailed Implementation

[0012] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0013] like Figure 1As shown, the sealing structure of this ball valve includes a valve body 1, a valve cover 2, and a valve ball 3. The valve body 1 and the valve cover 2 are threaded together. The valve ball 3 is located inside the valve body 1. The valve body 1 has a step 4, and a gasket 5 is provided on the step 4 to abut against the valve ball 3. The valve cover 2 has a step 6, and a gasket 7 is provided on the step 6 to abut against the valve ball 3. The step surface 1 of the step 4, which is in contact with the outer end face of the gasket 5, has an annular and recessed annular groove 8. A sealing ring 9 with an outer diameter greater than the depth of the annular groove 8 is provided in the annular groove 8. The sealing ring 9 abuts against the outer end face of the gasket 7. The step surface 2 of the step 6, which is in contact with the outer end face of the gasket 7, has an annular and recessed annular groove 10. A sealing ring 11 with an outer diameter greater than the depth of the annular groove 10 is provided in the annular groove 10. The sealing ring 11 abuts against the outer end face of the gasket 7.

[0014] In this ball valve sealing structure, the annular groove 8 and annular groove 10 are easy to process. The outer end faces of both gaskets 5 and 7 are flat, eliminating the need for further machining of arc grooves. Gaskets 5 and 7 are easy to manufacture, resulting in a high yield. Annular groove 8 ensures stable positioning of sealing ring 9, and annular groove 10 ensures stable positioning of sealing ring 11. During assembly, sealing rings 9 and 11 will not be squeezed by gaskets 5 and 7, preventing radial displacement and facilitating assembly. The width and depth of annular grooves 8 and 10 determine the deformation of sealing rings 9 and 11, as well as the forces they exert on gaskets 5 and 7. The contact area and force points of gaskets 5 and 7 with the valve ball 3 are consistent, ensuring the set torque of the valve ball 3 and resulting in good product consistency and a high pass rate.

[0015] The outer diameter of annular groove 18 is equal to the inner diameter of the inner wall of valve body 1 where the outer wall of gasket 5 abuts, and the outer diameter of annular groove 20 is equal to the inner diameter of the inner wall of valve cover 2 where the outer wall of gasket 27 abuts. Thus, the inner wall of valve body 1 where the outer wall of gasket 5 abuts serves as the machining reference surface for annular groove 18, and the inner wall of valve cover 2 where the outer wall of gasket 27 abuts serves as the machining reference surface for annular groove 20. Annular groove 18 and annular groove 20 are easy to machine and have high precision.

[0016] The inner diameter of washer 5 is less than or equal to the inner diameter of step 4, and the inner diameter of washer 7 is less than or equal to the inner diameter of step 6. This ensures good support for washer 5 from step 4 and good support for washer 7 from step 6, while also preventing interference between washer 5 and washer 7 with the medium flow rate, thus guaranteeing product stability. In this embodiment, the inner diameter of washer 5 is equal to the inner diameter of step 4, and the inner diameter of washer 7 is equal to the inner diameter of step 6.

[0017] Both washer 5 and washer 7 have rounded edges on their contact surfaces that abut against valve ball 3. These rounded edges prevent interference, facilitate assembly, and ensure smooth rotation of valve ball 3.

[0018] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A ball valve sealing structure, comprising a valve body (1), a valve cover (2), and a valve ball (3), wherein the valve body (1) and the valve cover (2) are threadedly connected, the valve ball (3) is located inside the valve body (1), a first step (4) is provided inside the valve body (1), a first washer (5) is provided on the first step (4) to abut against the valve ball (3), a second step (6) is provided inside the valve cover (2), a second washer (7) is provided on the second step (6) to abut against the valve ball (3), characterized in that, The step one (4) has an annular and recessed annular groove one (8) that abuts the outer end face of the gasket one (5). The annular groove one (8) has a sealing ring one (9) with an outer diameter greater than the depth of the annular groove one (8). The sealing ring one (9) abuts the outer end face of the gasket two (7). The step two (6) has an annular and recessed annular groove two (10) that abuts the outer end face of the gasket two (7). The annular groove two (10) has a sealing ring two (11) with an outer diameter greater than the depth of the annular groove two (10). The sealing ring two (11) abuts the outer end face of the gasket two (7).

2. The ball valve sealing structure according to claim 1, characterized in that, The outer diameter of the annular groove one (8) is equal to the inner diameter of the inner wall of the valve body (1) where the outer wall of the gasket one (5) abuts, and the outer diameter of the annular groove two (10) is equal to the inner diameter of the inner wall of the valve cover (2) where the outer wall of the gasket two (7) abuts.

3. The ball valve sealing structure according to claim 2, characterized in that, The inner diameter of washer one (5) is less than or equal to the inner diameter of step one (4), and the inner diameter of washer two (7) is less than or equal to the inner diameter of step two (6).

4. The ball valve sealing structure according to claim 3, characterized in that, Both washer one (5) and washer two (7) have rounded edges on the inner and outer edges of the contact surfaces that abut against the valve ball (3).

Images