Lip seal structure for ball valve and ball valve

Abstract

The utility model discloses a lip seal structure for ball valve and ball valve relates to valve body technical field. Lip seal structure for ball valve includes support ring and metal O shape spring, and the recess is established to one side of support ring, and the recess can be attached with the partial outer peripheral surface of metal O shape spring, still be established to multiple exhaust passages on support ring. Through above setting, can increase the contact area of metal O shape spring and support ring, and the recess can play the role of attaching and supporting metal O shape spring, avoid metal O shape spring to be pressed to collapse, still be established to multiple exhaust passages on support ring, can carry out pressure relief, can avoid the support ring and metal O shape spring to be pressed to collapse due to excessive pressure, realize sealing effect's while effectively maintaining the stability of this lip seal structure, and improved the service life of lip seal structure for ball valve. Ball valve includes above -mentioned lip seal structure for ball valve, improved the sealing effect of ball valve, guaranteed the service life of ball valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a lip seal structure for a ball valve and a ball valve. Background Technology

[0002] As a commonly used fluid control component, the sealing performance of ball valves is a key indicator of valve quality and reliability. Lip seals are widely used in medium and high-pressure ball valves.

[0003] Lip seals are a highly efficient sealing technology in valves. Their core structure consists of a resilient lip and an internal spring, achieving a seal through preload and media pressure. This technology typically uses a sealing ring made of polytetrafluoroethylene (PTFE) or reinforced polymers in conjunction with a metal spring. The spring provides the initial preload, while media pressure enhances the fit between the lip and the sealing surface. In ball valves, when a lip seal design is used on the valve seat, self-tightening sealing can be achieved through warping deformation or media thrust, adapting to high-pressure conditions.

[0004] In existing technologies, lip seals are typically installed between the valve seat and stem of a ball valve. A common sealing structure includes a support ring and a metal O-ring spring. The support ring is designed with a raised shape to support the metal O-ring spring. However, if the preload is too high, the small contact area between the raised portion and the metal O-ring spring may cause the spring to crush. Furthermore, when the pressure within the assembly groove is too high, the support ring is also at risk of crushing, resulting in a short service life and poor stability of the sealing structure.

[0005] Therefore, there is an urgent need for a lip seal structure for ball valves and a ball valve in general to solve the above problems. Utility Model Content

[0006] The first objective of this invention is to provide a lip-shaped sealing structure for ball valves to solve the problems of high risk of crushing, poor stability, and short service life of metal O-ring springs and support rings in the prior art.

[0007] The second objective of this invention is to provide a ball valve that improves the sealing effect and ensures the service life of the ball valve.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A lip seal structure for a ball valve includes a support ring and a metal O-ring spring. A groove is provided on one side of the support ring, which can fit against a portion of the outer peripheral surface of the metal O-ring spring. The support ring also has multiple exhaust channels, which all penetrate the support ring along its thickness direction.

[0010] Furthermore, the inner wall surface of the groove is curved.

[0011] Furthermore, multiple exhaust channels are evenly spaced on the support ring.

[0012] Furthermore, one end of the exhaust channel is connected to the groove.

[0013] Furthermore, the exhaust channel includes a first sub-channel and a second sub-channel, with one end of the first sub-channel and one end of the second sub-channel both located outside the groove.

[0014] Furthermore, the distance between the first sub-channel and the axis of the support ring is less than the distance between the second sub-channel and the axis of the support ring.

[0015] Furthermore, multiple first sub-channels are configured in a one-to-one correspondence with multiple second sub-channels.

[0016] Furthermore, the metal O-ring spring is made of stainless steel; and / or, the support ring is made of polyimide.

[0017] Furthermore, the groove is an annular groove.

[0018] A ball valve, including a lip-sealed structure for the ball valve.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a lip seal structure for ball valves, including a support ring and a metal O-ring spring. A groove is formed on one side of the support ring, which can fit against a portion of the outer circumferential surface of the metal O-ring spring. Multiple venting channels are also formed on the support ring, extending through the support ring along its thickness direction. Through this design, the groove on the support ring increases the contact area between the metal O-ring spring and the support ring when they mate. The groove also serves to fit and support the metal O-ring spring, thus buffering the contact pressure when the preload is high, preventing the metal O-ring spring from being crushed. Furthermore, the multiple venting channels on the support ring allow for pressure relief, preventing excessive pressure from crushing the support ring and the metal O-ring spring. This achieves a sealing effect while effectively maintaining the stability of the lip seal structure and improving its service life.

[0021] This utility model also provides a ball valve, including the above-mentioned lip sealing structure for ball valves, which can prevent excessive pressure from causing the support ring and metal O-ring spring to be crushed, thereby improving the sealing effect of the ball valve and ensuring its service life. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a lip seal structure for a ball valve provided in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure in which the exhaust channel and the groove are connected in a lip seal structure for a ball valve according to an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of a ball valve lip seal structure provided in this embodiment, in which one end of the first sub-channel and one end of the second sub-channel are both located outside the groove.

[0026] In the picture:

[0027] 1. Support ring; 11. Groove; 2. Metal O-ring spring; 3. Exhaust channel; 31. First sub-channel; 32. Second sub-channel. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly 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.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] This example provides a lip seal structure for ball valves that prevents excessive pressure from crushing the support ring and metal O-ring spring, achieving a sealing effect while effectively maintaining the stability of the lip seal structure and improving its service life.

[0033] like Figures 1-2 As shown, in this embodiment, the lip seal structure for the ball valve includes a support ring 1 and a metal O-ring spring 2. A groove 11 is provided on one side of the support ring 1, which can fit against a portion of the outer circumferential surface of the metal O-ring spring 2. Multiple exhaust channels 3 are also provided on the support ring 1, all penetrating the support ring 1 along its thickness direction. It can be understood that, through the above arrangement, the groove 11 on the support ring 1 increases the contact area between the metal O-ring spring 2 and the support ring 1 when it mates with the metal O-ring spring 2. The groove 11 also serves to fit and support the metal O-ring spring 2, thus buffering the contact pressure when the preload is high, preventing the metal O-ring spring 2 from being crushed. Furthermore, the multiple exhaust channels 3 on the support ring 1 allow for pressure relief, preventing excessive pressure from crushing the support ring 1 and the metal O-ring spring 2. This achieves a sealing effect while effectively maintaining the stability of the lip seal structure and improving the service life of the lip seal structure for the ball valve.

[0034] It should be noted that in this embodiment, the lip seal is attached to the valve seat surface and located inside the ball valve. One side of the metal O-ring spring 2 pushes against the seal, and the other side is located in the groove 11 of the support ring 1. One side of the support ring 1 is attached to and supports the spring through the groove 11, and the side of the support ring 1 away from the metal O-ring spring 2 presses against the inner wall of the valve seat cavity.

[0035] like Figure 1 As shown, in this embodiment, a ring-shaped protrusion is provided on one side of the support ring 1, and a groove 11 is formed on the protrusion, so that the groove 11 can contact the metal O-ring spring 2.

[0036] For example, such as Figure 1 As shown, the inner wall of the groove 11 is curved. It can be understood that the outer contour of the metal O-ring 2 is curved. By making the inner wall of the groove 11 curved, it is easier for the inner wall of the groove 11 to fit snugly against the outer contour of the metal O-ring 2, further increasing the contact area between the support ring 1 and the metal O-ring 2, thus facilitating the support ring 1 to support the metal O-ring 2. Furthermore, even when the preload is large, if the support ring 1 undergoes slight deformation, the groove 11 can maintain its contact with the metal O-ring 2, exhibiting high stability.

[0037] Furthermore, multiple exhaust channels 3 are evenly spaced on the support ring 1. It is understood that the evenly spaced multiple exhaust channels 3 can improve the uniformity of pressure relief and better protect the support ring 1.

[0038] For example, such as Figures 1-2 As shown, one end of the exhaust channel 3 can be connected to the groove 11. That is, one end of the exhaust channel 3 is connected to the groove 11, and the other end of the exhaust channel 3 extends to the side of the support ring 1 away from the metal O-ring spring 2. It can be understood that the exhaust channel 3 is directly connected to the groove 11, providing a natural pressure relief port for this closed "spring cavity," that is, the groove 11. Any abnormally high pressure formed in the spring cavity can be quickly released through this channel.

[0039] For example, such as Figure 3 As shown, the exhaust channel 3 may also include a first sub-channel 31 and a second sub-channel 32. One end of the first sub-channel 31 and one end of the second sub-channel 32 are both located outside the groove 11, and the other end of the first sub-channel 31 and one end of the second sub-channel 32 both extend to the side of the support ring 1 away from the metal O-ring spring 2. In other words, one end of the first sub-channel 31 and one end of the second sub-channel 32 are not connected to the groove 11.

[0040] Furthermore, the distance between the first sub-channel 31 and the axis of the support ring 1 is less than the distance between the second sub-channel 32 and the axis of the support ring 1. That is, the first sub-channel 31 is located near the inner side of the support ring 1, and the second sub-channel 32 is located near the outer side of the support ring 1, which means that pressure relief can be performed at different positions of the support ring 1.

[0041] In this embodiment, the diameter of the first sub-channel 31 is larger than the diameter of the second sub-channel 32. Of course, in other embodiments, the diameter of the first sub-channel 31 may also be equal to the diameter of the second sub-channel 32, or the diameter of the first sub-channel 31 may be smaller than the diameter of the second sub-channel 32.

[0042] Furthermore, multiple first sub-channels 31 are configured in a one-to-one correspondence with multiple second sub-channels 32 to facilitate improved pressure relief uniformity.

[0043] In this embodiment, the metal O-ring 2 is made of stainless steel. It is understood that using stainless steel can improve the corrosion resistance, fatigue life, and elastic stability of the metal O-ring 2.

[0044] In this embodiment, the support ring 1 is made of polyimide. It is understood that polyimide is a high-strength engineering plastic, characterized by high strength, light weight, and self-lubrication. This improves the service life of the support ring 1 and prevents it from "seizing" or "adhesive wear" with the metal valve body at high temperatures, i.e., it prevents adhesion to the metal valve body at high temperatures. Of course, in other embodiments, the support ring 1 can also be made of other types of components, such as polytetrafluoroethylene (PTFE) components, polyetheretherketone (PEEK) components, etc., depending on the actual application requirements.

[0045] Furthermore, the groove 11 is an annular groove, and the axis of the annular groove coincides with the axis of the support ring 1. It can be understood that by setting the groove 11 to be an annular groove, the metal O-ring spring 2 can be fully fitted and supported, the metal O-ring spring 2 is subjected to uniform force, and the stability of the groove 11 and the metal O-ring spring 2 under force is improved.

[0046] This embodiment also provides a ball valve that improves the sealing effect of the ball valve and ensures its service life.

[0047] In this embodiment, the ball valve includes the aforementioned lip seal structure for ball valves. It is understood that by employing the aforementioned lip seal structure for ball valves, excessive pressure can prevent the support ring 1 and the metal O-ring spring 2 from being crushed, thereby improving the sealing effect of the ball valve and ensuring its service life.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A lip seal structure for a ball valve, characterized in that, It includes a support ring (1) and a metal O-ring spring (2). A groove (11) is provided on one side of the support ring (1). The groove (11) can fit against part of the outer peripheral surface of the metal O-ring spring (2). A plurality of exhaust channels (3) are also provided on the support ring (1). The plurality of exhaust channels (3) all penetrate the support ring (1) along the thickness direction of the support ring (1).

2. The lip seal structure for a ball valve according to claim 1, characterized in that, The inner wall of the groove (11) is curved.

3. The lip seal structure for a ball valve according to claim 1, characterized in that, Multiple exhaust channels (3) are evenly spaced on the support ring (1).

4. The lip seal structure for a ball valve according to claim 1, characterized in that, One end of the exhaust channel (3) is connected to the groove (11).

5. The lip seal structure for a ball valve according to claim 1, characterized in that, The exhaust channel (3) includes a first sub-channel (31) and a second sub-channel (32), with one end of the first sub-channel (31) and one end of the second sub-channel (32) located outside the groove (11).

6. The lip seal structure for a ball valve according to claim 5, characterized in that, The distance between the first sub-channel (31) and the axis of the support ring (1) is less than the distance between the second sub-channel (32) and the axis of the support ring (1).

7. The lip seal structure for a ball valve according to claim 5, characterized in that, Multiple first sub-channels (31) are configured in a one-to-one correspondence with multiple second sub-channels (32).

8. The lip seal structure for a ball valve according to claim 1, characterized in that, The metal O-ring (2) is made of stainless steel; and / or the support ring (1) is made of polyimide.

9. The lip seal structure for a ball valve according to any one of claims 1-8, characterized in that, The groove (11) is an annular groove.

10. A ball valve, characterized in that, Includes the lip seal structure for ball valves as described in any one of claims 1-9.

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