High-pressure ball valve with two-stage sealing structure

Abstract

The utility model relates to the technical field of valves, in particular to a high-pressure ball valve with a two-stage sealing structure, which comprises a valve body, a valve cavity is arranged in the middle of the valve body, clamping plates are fixedly mounted above and below two sides of the middle of the valve cavity, and a clamping groove is formed between the clamping plates. Wherein vertical baffles are fixedly installed on one sides of the upper ends of the two clamping plates located on the upper portion, a sealing ring is clamped to the middle of the clamping groove, a limiting groove is formed in the middle of one end of the sealing ring, a plurality of springs are annularly, evenly and fixedly installed on the inner wall of the limiting groove, and one ends of the springs are fixedly connected with the inner wall of the clamping groove. And movable grooves are formed in the upper ends of the limiting grooves. The ball valve solves the problems that a traditional ball valve is usually sealed by means of simple contact between a valve seat and a ball body, the sealing reliability is low, and many defects exist in actual use.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a high-pressure ball valve with a dual-stage sealing structure. Background Technology

[0002] A ball valve is a valve whose opening and closing element is a ball, mainly driven by the valve stem and rotating around the valve axis. It can also be used for fluid regulation and control. Among them, the hard-seal V-type ball valve has a strong shearing force between the V-shaped ball core and the metal valve seat with hard alloy overlay, making it particularly suitable for media containing fibers, small solid particles, etc. Multi-port ball valves can not only flexibly control the merging, splitting, and switching of media in pipelines, but also close any channel while connecting the other two channels. This type of valve should generally be installed horizontally in pipelines. Ball valves are classified into pneumatic ball valves, electric ball valves, and manual ball valves according to the driving method.

[0003] Traditional ball valves typically rely on simple contact between the valve seat and the ball for sealing, resulting in low sealing reliability and numerous shortcomings in practical applications. For example, under high-pressure conditions, the medium pressure can cause slight deformation of the valve seat and ball, creating gaps in the originally tightly fitted sealing surface and leading to media leakage. When conveying fluids containing particulate impurities, these impurities can easily embed into the sealing surface, damaging the sealing structure and shortening the valve's service life. Simultaneously, temperature changes can cause thermal expansion and contraction of materials, resulting in looser sealing surfaces and further leakage problems. Furthermore, with increased usage time, wear on the valve seat and ball leads to increased sealing gaps, reducing sealing performance. Leakage can then trigger safety accidents or cause economic losses, especially in industries with extremely high sealing requirements such as petrochemicals and natural gas transportation, where these shortcomings are even more pronounced. Utility Model Content

[0004] One of the technical problems that this application aims to solve is that traditional ball valves usually rely on simple contact between the valve seat and the ball for sealing, which results in low sealing reliability and many shortcomings in practical use.

[0005] To address the aforementioned technical problems, this application provides a high-pressure ball valve with a dual-stage sealing structure, comprising a valve body, a valve cavity in the middle of the valve body, and locking plates fixedly installed on the upper and lower sides of both sides of the middle of the valve cavity, forming a locking groove between the locking plates. A vertical baffle is fixedly installed on one side of the upper end of the two upper locking plates. A sealing ring is engaged in the middle of the locking groove, and a limiting groove is formed in the middle of one end of the sealing ring. Multiple springs are uniformly fixedly installed in a ring shape on the inner wall of the limiting groove, with one end of each spring fixedly connected to the inner wall of the locking groove. A movable groove is formed at the upper end of each limiting groove.

[0006] In some embodiments, a valve seat is fixedly installed at the upper end of the valve body, and a valve cover is threadedly connected to the upper end of the valve seat.

[0007] In some embodiments, an O-type ball valve is rotatably mounted in the middle of the valve cavity, and a valve stem is fixedly mounted on the upper end of the O-type ball valve.

[0008] In some embodiments, a handwheel is fixedly mounted on the upper end of the valve stem, and the middle part of the valve stem is threadedly connected to the valve cover.

[0009] In some embodiments, a top sealing plate is fixedly installed on the outer side below the middle of the valve stem, the top sealing plate is snapped onto the lower end of the valve cover, and a sealing tube is fixedly installed on the outer side of the connection between the valve stem and the sealing tube.

[0010] In some embodiments, the movable groove and the spring are connected, the vertical baffle is slidably engaged in the middle of the movable groove, the width of the movable groove is greater than the thickness of the vertical baffle, the sealing ring abuts against the O-ring ball valve, and the two clamping plates and the vertical baffle are respectively engaged in the middle of the limiting groove and the movable groove.

[0011] In some embodiments, flow channels are provided at both ends of the middle part of the valve body, and the flow channels are connected to the valve cavity.

[0012] In some embodiments, flanges are fixedly installed on the outer sides of both ends of the valve body.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. In use, this utility model provides reliable sealing and adaptive compensation. It employs a dual-stage sealing structure design. On one hand, the valve seat and ball are precisely matched, and the sealing ring, under the action of a spring, tightly fits the O-type ball valve, achieving a primary seal. On the other hand, the top sealing plate and sealing tube at the valve stem form a secondary seal. Simultaneously, the spring within the sealing ring's limiting groove can adaptively adjust according to the ball's stress and wear, dynamically compensating for the sealing gap and ensuring long-term good sealing performance under high-pressure conditions, effectively preventing media leakage.

[0015] 2. When in use, the overall structure of this utility model is stable and flexible. The locking plate, vertical baffle and the locking groove, limiting groove and movable groove of the sealing ring cooperate with each other to make the sealing ring installed firmly. At the same time, the sliding design of the vertical baffle in the movable groove provides the sealing ring with freedom of movement to better adapt to the movement and sealing requirements of the ball valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall appearance and structure of the present utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the present invention.

[0018] Figure 3 This is a schematic diagram showing the positional relationship between the sealing ring, the two retaining plates, and the groove they form in this utility model.

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the valve cover of this utility model.

[0020] In the diagram: 1. Valve body; 11. Flange; 12. Valve seat; 13. Valve cover; 14. O-type ball valve; 15. Valve stem; 16. Handwheel; 17. Flow channel; 2. Clamping plate; 20. Valve cavity; 21. Vertical baffle; 22. Sealing ring; 23. Limiting groove; 24. Movable groove; 25. Spring; 26. Top sealing plate; 27. Sealing pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figure 1-4 This utility model provides a technical solution: a high-pressure ball valve with a double-stage sealing structure, including a valve body 1, a valve cavity 20 in the middle of the valve body 1, and a retaining plate 2 fixedly installed on the upper and lower sides of the middle of the valve cavity 20, forming a retaining groove between the retaining plates 2. A vertical baffle 21 is fixedly installed on one side of the upper end of the two upper retaining plates 2. A sealing ring 22 is engaged in the middle of the retaining groove. A limiting groove 23 is formed in the middle of one end of the sealing ring 22. Multiple springs 25 are uniformly fixedly installed in a ring shape on the inner wall of the limiting groove 23. One end of each spring 25 is fixedly connected to the inner wall of the retaining groove. The upper end of the limiting groove 23 is provided with a movable groove 24. A top sealing plate 26 is fixedly installed on the outer side below the middle of the valve stem 15. The top sealing plate 26 is snapped into the lower end of the valve cover 13. A sealing tube 27 is fixedly installed on the outer side of the connection between the valve stem 15 and the sealing tube 27. The movable groove 24 is connected to the spring 25. The vertical baffle 21 is slidably snapped into the middle of the movable groove 24. The width of the movable groove 24 is greater than the thickness of the vertical baffle 21. The sealing ring 22 abuts against the O-type ball valve 14. The two clamping plates 2 and the vertical baffle 21 are respectively snapped into the middle of the limiting groove 23 and the movable groove 24.

[0023] In this embodiment, a primary seal is achieved by the sealing ring 22 abutting against the O-type ball valve 14. Simultaneously, a sealing tube 27 is provided at the valve stem 15, forming a secondary seal. This dual-stage sealing structure effectively improves the valve's sealing performance, ensuring that the medium is not easily leaked under high-pressure conditions. A spring 25 is installed in the limiting groove 23 of the sealing ring 22. When the valve is subjected to pressure changes or other external forces, the spring 25 can extend and retract according to the force, causing the sealing ring 22 to adaptively adjust, compensating for deformation or wear of the sealing surface and maintaining a good sealing effect. The locking plate 2, vertical baffle 21, and the locking groove, limiting groove 23, and movable groove 24 of the sealing ring 22 engage with each other, ensuring a stable and reliable installation of the sealing ring 22. Under high pressure, it is not easy to displace or loosen, ensuring the stability of the sealing structure. The width of the movable groove 24 is greater than the thickness of the vertical baffle 21, allowing the vertical baffle 21 to slide flexibly in the movable groove 24. This ensures that the sealing ring 22 has a certain degree of freedom of movement to adapt to the sealing requirements under different working conditions, and also limits the sealing ring 22 to prevent it from moving excessively. The top sealing plate 26, which is fixedly installed on the outer side of the lower part of the valve stem 15, is snapped into the lower end of the valve cover 13. There is also a sealing tube 27 on the outer side of the connection between the valve stem 15 and the sealing tube 27, which strengthens the sealing at the valve stem 15 and prevents the medium from leaking along the gap between the valve stem 15 and the valve cover 13, thereby improving the overall sealing performance and reliability of the valve.

[0024] Example 2: Figure 1-4 As shown, a valve seat 12 is fixedly installed on the upper end of the valve body 1, and a valve cover 13 is threadedly connected to the upper end of the valve seat 12. An O-type ball valve 14 is rotatably installed in the middle of the valve cavity 20. A valve stem 15 is fixedly installed on the upper end of the O-type ball valve 14, and a handwheel 16 is fixedly installed on the upper end of the valve stem 15. The middle part of the valve stem 15 and the valve cover 13 are threadedly connected. Flow channels 17 are opened at both ends of the middle part of the valve body 1, and the flow channels 17 are connected to the valve cavity 20. Flanges 11 are fixedly installed on the outer sides of both ends of the valve body 1.

[0025] In this embodiment, the valve seat 12 and the valve cover 13 are connected by threads. This connection method is not only convenient for installation and disassembly, but also provides a relatively stable connection. At the same time, the threaded connection also helps to enhance the sealing performance to a certain extent, ensuring the sealing of the valve cavity 20 and reducing the possibility of media leakage. The O-type ball valve 14 is connected to the handwheel 16 through the valve stem 15. The operator can easily control the opening and closing of the ball valve by rotating the handwheel 16, thereby achieving precise control of the fluid. This design makes the valve operation simple and intuitive, facilitating daily operation and maintenance by the staff. The flow channels 17 opened at both ends of the middle of the valve body 1 are connected to the valve cavity 20, providing a smooth passage for the fluid. The design of the flow channels 17 can reduce the resistance when the fluid flows in the valve body 1, reduce energy loss, and improve the efficiency of fluid transportation. The flanges 11 fixedly installed on the outer sides of both ends of the valve body 1 facilitate the connection between the valve and the pipeline system. The flange connection is a common pipeline connection method with advantages such as high connection strength, good sealing performance, and convenient installation and disassembly. It can quickly and conveniently install the valve into the pipeline system and facilitate subsequent maintenance and replacement.

[0026] like Figure 1-4As shown, the operator rotates the handwheel 16 to drive the valve stem 15 to rotate. Since the valve stem 15 is fixedly connected to the O-type ball valve 14, the O-type ball valve 14 will rotate together with the valve stem 15. When the O-type ball valve 14 rotates until the flow channel 17 is fully connected to the valve cavity 20, the valve is in the open state, and fluid can flow from the flow channel 17 at one end of the valve body 1 through the valve cavity 20 to the flow channel 17 at the other end. When the O-type ball valve 14 rotates until its ball surface is tightly fitted with the valve seat 12, the valve is in the closed state, preventing fluid from passing through. When the valve is closed, the O-type ball valve 14 is in close contact with the valve seat 12 under the action of the valve stem 15. The sealing surfaces of the valve seat 12 and the ball are machined with high precision to achieve a good initial seal. At the same time, the sealing rings 22 fixedly installed on the clamping plates 2 on both sides of the middle of the valve cavity 20 are tightly pressed against the O-type ball valve 14 under the action of the spring 25, further enhancing the sealing effect. The presence of spring 25 allows sealing ring 22 to adaptively adjust according to the position and force of the ball, compensating for changes in sealing gap caused by wear, pressure variations, etc., forming a primary sealing protection. A threaded connection exists between the middle of valve stem 15 and valve cover 13. A top sealing plate 26, fixedly installed on the outer side below the middle of valve stem 15, is snapped into the lower end of valve cover 13. A sealing tube 27 is also fixedly installed on the outer side of the connection between valve stem 15 and sealing tube 27. When the valve is closed, valve stem 15 is in a relatively fixed position, top sealing plate 26 fits tightly with valve cover 13, and sealing tube 27 seals the gap between valve stem 15 and valve cover 13, preventing leakage of the medium along the gap, forming a secondary sealing protection. A groove is formed between the clamping plates 2, and sealing ring 22 is snapped into the groove. A limiting groove 23 at the middle of one end of the sealing ring 23 cooperates with clamping plate 2 and vertical baffle 21. The vertical baffle 21 is slidably engaged in the movable groove 24 of the sealing ring 22. The movable groove 24 is connected to the spring 25, and the width of the movable groove 24 is greater than the thickness of the vertical baffle 21. This structural design ensures that the sealing ring 22 is securely installed and is not prone to displacement or loosening during valve operation, even under the impact of high-pressure fluid or other external forces. Simultaneously, the sliding design of the vertical baffle 21 within the movable groove 24 provides the sealing ring 22 with a certain degree of freedom of movement, allowing it to better adapt to the movement and sealing requirements of the O-type ball valve 14 under the action of the spring 25.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-pressure ball valve with a dual-stage sealing structure, comprising a valve body (1), wherein a valve cavity (20) is formed in the middle of the valve body (1), characterized in that: The valve cavity (20) has two card plates (2) fixedly installed on the upper and lower sides of the middle. The card plates (2) form a card groove. The two upper card plates (2) have vertical baffles (21) fixedly installed on one side of the upper end. The card groove has a sealing ring (22) engaged in the middle. The sealing ring (22) has a limiting groove (23) in the middle of one end. The inner wall of the limiting groove (23) has multiple springs (25) fixedly installed in a ring shape. One end of the spring (25) is fixedly connected to the inner wall of the card groove. The upper end of the limiting groove (23) has a movable groove (24).

2. A high-pressure ball valve with a dual-stage sealing structure according to claim 1, characterized in that: A valve seat (12) is fixedly installed on the upper end of the valve body (1), and a valve cover (13) is threadedly connected to the upper end of the valve seat (12).

3. A high-pressure ball valve with a dual-stage sealing structure according to claim 2, characterized in that: An O-type ball valve (14) is rotatably installed in the middle of the valve chamber (20), and a valve stem (15) is fixedly installed at the upper end of the O-type ball valve (14).

4. A high-pressure ball valve with a dual-stage sealing structure according to claim 3, characterized in that: A handwheel (16) is fixedly installed at the upper end of the valve stem (15), and the middle part of the valve stem (15) is threadedly connected to the valve cover (13).

5. A high-pressure ball valve with a dual-stage sealing structure according to claim 4, characterized in that: A top sealing plate (26) is fixedly installed on the outer side below the middle of the valve stem (15). The top sealing plate (26) is snapped onto the lower end of the valve cover (13). A sealing tube (27) is fixedly installed on the outer side of the connection between the valve stem (15) and the sealing tube (27).

6. A high-pressure ball valve with a dual-stage sealing structure according to claim 1, characterized in that: The movable groove (24) and the spring (25) are connected. The vertical baffle (21) is slidably engaged in the middle of the movable groove (24). The width of the movable groove (24) is greater than the thickness of the vertical baffle (21). The sealing ring (22) and the O-type ball valve (14) abut against each other. The two clamping plates (2) and the vertical baffle (21) are respectively engaged in the middle of the limiting groove (23) and the movable groove (24).

7. A high-pressure ball valve with a dual-stage sealing structure according to claim 1, characterized in that: The valve body (1) has flow channels (17) at both ends in the middle, and the flow channels (17) are connected to the valve cavity (20).

8. A high-pressure ball valve with a dual-stage sealing structure according to claim 1, characterized in that: Flanges (11) are fixedly installed on the outer sides of both ends of the valve body (1).

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