Complementary double-layer elastic sealing ring for ball valves

Abstract

This utility model relates to the technical field of ball valve sealing components, specifically a complementary double-layer elastic sealing ring for a ball valve. It includes a support ring, a first sealing ring snapped onto the support ring, and a second sealing ring threaded onto the first sealing ring. The outer wall of the support ring is threaded, and the support ring is threaded to the inner wall of the ball valve body. An annular external mounting groove is provided on the outer side of the first sealing ring. This utility model, through the threaded connection between the support ring and the inner wall of the valve body, and the snap-fit ​​connection between the first sealing ring and the support ring, and the threaded connection between the second sealing ring and the first sealing ring, achieves a stable assembly of the sealing component and the valve body. It also facilitates the individual installation and disassembly of each sealing ring, providing convenience for later maintenance and replacement. The double-layer sealing ring design provides double sealing protection for the ball valve, effectively improving sealing reliability compared to a single-layer sealing structure.

Description

Technical Field

[0001] This utility model relates to the technical field of ball valve sealing components, specifically a complementary double-layer elastic sealing ring for ball valves. Background Technology

[0002] As a widely used opening, closing, and regulating device in fluid pipelines, the sealing performance of ball valves is a core indicator determining the safety and reliability of pipeline systems. The sealing ring, as a key component for achieving the sealing function of a ball valve, must maintain a tight seal with the ball surface at all times under the influence of ball rotation and medium pressure to prevent media leakage.

[0003] Existing technology, such as patent application number CN202021398379.3, discloses a ball valve with a sealing ring, which consists of a valve body, sealing ring A, valve sleeve, bushing, valve shaft, sealing ring a, sealing ring B, valve core, sealing ring b, and O-ring seal. It adds a sealing ring to the original ball valve sealing ring to ensure the stability of the sealing ring, thereby effectively improving the reliability of the ball valve. However, the sealing ring in this technical solution often adopts a single-layer structure design, which has the following shortcomings: single-layer sealing rings usually rely on the elasticity of a single material to achieve sealing; if the material selection focuses on wear resistance, the temperature resistance or corrosion resistance may be insufficient; the installation structure of single-layer sealing rings is mostly a fixed connection or integral embedding. When the sealing ring is partially worn or aged, it needs to be completely disassembled and replaced, which not only complicates maintenance operations but also increases equipment downtime and maintenance costs.

[0004] In view of this, we propose a complementary double-layer elastic sealing ring for ball valves. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a complementary double-layer elastic sealing ring for ball valves.

[0006] The technical solution of this utility model is:

[0007] The ball valve features a complementary double-layer elastic sealing ring system, including a support ring. A first sealing ring is snapped onto the support ring, and a second sealing ring is threaded onto the first sealing ring. The outer ring wall of the support ring is threaded, and the support ring is threadedly connected to the inner wall of the ball valve body. An annular external mounting groove is formed on the outer side of the first sealing ring. The second sealing ring, near the first sealing ring, has a threaded tube coaxially and integrally formed, which is threadedly connected to the inner ring wall of the external mounting groove. By setting the structure of the support ring threadedly connected to the inner wall of the valve body, and the first sealing ring snapped onto the support ring and the second sealing ring threadedly connected to the first sealing ring, a stable assembly of the sealing components and the valve body is achieved. Simultaneously, it facilitates the individual installation and disassembly of each sealing ring, providing convenience for future maintenance and replacement. The double-layer sealing ring design provides double sealing protection for the ball valve, effectively improving sealing reliability compared to a single-layer sealing structure.

[0008] As a preferred technical solution, when the threaded tube is tightened onto the outer mounting groove, the second sealing ring and the first sealing ring fit tightly together. This ensures that the second sealing ring and the first sealing ring fit tightly together after the threaded connection, eliminating the gap between them and preventing the medium from leaking from the connection between the two sealing rings, thus further enhancing the synergistic effect of the double-layer seal.

[0009] As a preferred technical solution, a limiting hook ring is integrally formed on the inner ring wall of the support ring, and a retaining ring is integrally formed on the first sealing ring. The retaining ring is engaged with the limiting hook ring. The engaging structure of the limiting hook ring and the retaining ring plays a role in accurately positioning and firmly fixing the first sealing ring on the support ring, preventing axial displacement of the first sealing ring during the operation of the ball valve.

[0010] As a preferred technical solution, when the retaining ring and the limiting hook are tightly fitted, the first sealing ring and the support ring are also tightly fitted. This avoids media leakage caused by gaps between the two, and at the same time enhances the overall sealing performance of the connection between the first sealing ring and the support ring.

[0011] As a preferred technical solution, an annular support plate is integrally formed on the inner ring wall of the support ring away from the first sealing ring. When the first sealing ring is connected to the support ring, the first sealing ring and the annular support plate fit tightly together. The annular support plate provides additional axial support to the first sealing ring, effectively resisting deformation when the first sealing ring is subjected to medium pressure or spherical compression.

[0012] As a preferred technical solution, the second sealing ring has an inner mounting groove, and a bellows is fixedly installed inside the inner mounting groove. Both ends of the bellows are fixedly connected to the two ends of the inner mounting groove. The installation of the bellows gives the second sealing ring better elastic compensation capability. When there is a slight displacement or wear between the ball and the sealing ring, the bellows can push the second sealing ring to fit tightly against the ball through its own elastic deformation.

[0013] As a preferred technical solution, the length of the threaded tube is the same as the depth of the outer mounting groove. The first sealing ring is made of rubber, and the second sealing ring is made of silicone. This ensures that the end face of the second sealing ring is flush with the end face of the first sealing ring after installation, avoiding deformation or sealing failure caused by mismatched installation dimensions. Furthermore, the selection of rubber and silicone, two different elastic materials, leverages their complementary properties; the wear resistance of rubber combined with the temperature resistance of silicone enhances the overall applicability of the sealing ring.

[0014] As a preferred technical solution, the diameters of the inner ring walls of the support ring, the first sealing ring, and the second sealing ring are equal. This ensures that the three rings form a smooth and continuous inner wall surface, avoiding steps or protrusions caused by diameter differences that could obstruct the flow of the medium, and reducing fluid resistance and turbulence.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention achieves a stable assembly of the sealing component and the valve body by setting a support ring threadedly connected to the inner wall of the valve body, and a first sealing ring snapped into the support ring and a second sealing ring threadedly connected to the first sealing ring. At the same time, it facilitates the individual installation and disassembly of each sealing ring, providing convenience for later maintenance and replacement. The double-layer sealing ring design provides double sealing protection for the ball valve, which can effectively improve sealing reliability compared with a single-layer sealing structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 1 Internal structure diagram;

[0019] Figure 3 In this utility model Figure 2 Enlarged view of point A in the image;

[0020] Figure 4 In this utility model Figure 2 Enlarged view of point B in the image;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Support ring; 10. Limiting hook ring; 11. Annular support plate; 2. First sealing ring; 20. External mounting groove; 21. Snap ring; 3. Second sealing ring; 30. Internal mounting groove; 31. Corrugated pipe; 32. Threaded pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0024] Please see Figures 1-4 This utility model provides a technical solution:

[0025] The ball valve features a complementary double-layer elastic sealing ring system, comprising a support ring 1, a first sealing ring 2 snapped onto the support ring 1, and a second sealing ring 3 threaded onto the first sealing ring 2. The outer ring wall of the support ring 1 is threaded, and the support ring 1 is threadedly connected to the inner wall of the ball valve body. An annular external mounting groove 20 is formed on the outer side of the first sealing ring 2. The second sealing ring 3, near the first sealing ring 2, has a threaded tube 32 coaxially and integrally formed, threadedly connected to the inner ring wall of the external mounting groove 20. By setting the structure of the support ring 1 threadedly connected to the inner wall of the valve body, and the first sealing ring 2 snapped onto the support ring 1, and the second sealing ring 3 threadedly connected to the first sealing ring 2, a stable assembly of the sealing components and the valve body is achieved. Simultaneously, it facilitates the individual installation and disassembly of each sealing ring, providing convenience for later maintenance and replacement. The double-layer sealing ring design provides double sealing protection for the ball valve, effectively improving sealing reliability compared to a single-layer sealing structure.

[0026] As a preferred embodiment, when the threaded pipe 32 is tightened on the outer mounting groove 20, the second sealing ring 3 and the first sealing ring 2 fit tightly together. This ensures that the second sealing ring 3 and the first sealing ring 2 fit tightly together after the threaded connection, eliminating the gap between them and preventing the medium from leaking from the connection between the two sealing rings, thus further enhancing the synergistic effect of the double-layer seal.

[0027] In a preferred embodiment, a limiting hook ring 10 is integrally formed on the inner ring wall of the support ring 1, and a retaining ring 21 is integrally formed on the first sealing ring 2. The retaining ring 21 is engaged with the limiting hook ring 10. The engaging structure between the limiting hook ring 10 and the retaining ring 21 provides precise positioning and stable fixation for the first sealing ring 2 on the support ring 1, preventing axial displacement of the first sealing ring 2 during the operation of the ball valve.

[0028] In this preferred embodiment, when the retaining ring 21 and the limiting hook ring 10 are tightly fitted, the first sealing ring 2 and the support ring 1 are also tightly fitted. This avoids media leakage caused by gaps between the two and enhances the overall sealing performance of the connection between the first sealing ring 2 and the support ring 1.

[0029] In a preferred embodiment, an annular support plate 11 is integrally formed on the inner wall of the support ring 1 away from the first sealing ring 2. When the first sealing ring 2 is connected to the support ring 1, the first sealing ring 2 and the annular support plate 11 fit tightly together. The annular support plate 11 provides additional axial support for the first sealing ring 2, and can effectively resist deformation when the first sealing ring 2 is subjected to medium pressure or spherical compression.

[0030] In a preferred embodiment, the second sealing ring 3 has an inner mounting groove 30, and a bellows 31 is fixedly installed inside the inner mounting groove 30. Both ends of the bellows 31 are fixedly connected to both ends of the inner mounting groove 30. The installation of the bellows 31 gives the second sealing ring 3 better elastic compensation capability. When there is a slight displacement or wear between the ball and the sealing ring, the bellows 31 can push the second sealing ring 3 to fit tightly against the ball through its own elastic deformation.

[0031] In this preferred embodiment, the length of the threaded tube 32 is the same as the depth of the outer mounting groove 20. The first sealing ring 2 is made of rubber, and the second sealing ring 3 is made of silicone. This ensures that the end face of the second sealing ring 3 is flush with the end face of the first sealing ring 2 after installation, avoiding deformation or sealing failure of the sealing ring due to mismatch in installation dimensions. The selection of two different elastic materials, rubber and silicone, utilizes their respective material properties to form a complementary performance. The wear resistance of rubber and the temperature resistance of silicone are combined to improve the overall applicability of the sealing ring.

[0032] In this preferred embodiment, the inner ring walls of the support ring 1, the first sealing ring 2, and the second sealing ring 3 have the same diameter. This ensures that the three form a smooth and continuous inner wall surface, avoiding steps or protrusions caused by diameter differences that could obstruct the flow of the medium, and reducing fluid resistance and turbulence.

[0033] In use, the complementary double-layer elastic sealing ring of the ball valve of this utility model is assembled as follows: the support ring 1 is firmly connected to the inner wall of the ball valve body through the outer ring wall thread, forming the basic support of the overall sealing structure; the first sealing ring 2 is engaged with the limiting hook ring 10 of the support ring 1 through the retaining ring 21, and is also tightly fitted with the annular support plate 11 of the support ring 1, achieving dual fixation in the radial and axial directions, ensuring that it does not shift or deform under the pressure of the medium and the extrusion of the ball; the second sealing ring 3 is threadedly connected to the outer mounting groove 20 of the first sealing ring 2 through the threaded tube 32, and the length of the threaded tube 32 is consistent with the depth of the outer mounting groove 20, so that the two fit tightly and the end faces are flush, forming a gapless double-layer sealing structure.

[0034] During operation, the silicone second sealing ring 3 initially adheres to the sphere due to its elasticity, using its wear resistance to prevent media leakage. The rubber first sealing ring 2 further strengthens the seal by utilizing the rubber's temperature resistance. Its internal bellows 31 can compensate for minor displacements or wear between the sphere and the sealing ring through elastic deformation, ensuring that the second sealing ring 3 remains in close contact with the sphere, forming dynamic sealing compensation. Simultaneously, the inner ring diameters of the support ring 1, the first sealing ring 2, and the second sealing ring 3 are equal, forming a smooth and continuous inner wall surface, reducing media flow resistance and turbulence erosion of the sealing rings.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A complementary double-layer elastomeric seal ring for a ball valve, characterized in that: The device includes a support ring (1), on which a first sealing ring (2) is snapped together. A second sealing ring (3) is threaded onto the first sealing ring (2). The outer ring wall of the support ring (1) is threaded. The support ring (1) is threaded to the inner wall of the ball valve body. An annular outer mounting groove (20) is opened on the outer side of the first sealing ring (2). The second sealing ring (3) is coaxially integrally formed with a threaded tube (32) that is threaded to the inner ring wall of the outer mounting groove (20) on the side near the first sealing ring (2).

2. The complementary double-layer elastomeric seal ring for a ball valve according to claim 1, characterized in that: When the threaded tube (32) is tightened on the outer mounting groove (20), the second sealing ring (3) fits tightly against the first sealing ring (2).

3. The complementary dual-layer elastomeric seal ring for a ball valve of claim 2, wherein: A limiting hook ring (10) is integrally formed on the inner ring wall of the support ring (1), and a retaining ring (21) is integrally formed on the first sealing ring (2). The retaining ring (21) is engaged with the limiting hook ring (10).

4. The complementary dual-layer elastomeric seal ring for a ball valve of claim 3, wherein: When the retaining ring (21) is tightly fitted with the limiting hook ring (10), the first sealing ring (2) is tightly fitted with the support ring (1).

5. The complementary double-layer elastomeric seal ring for a ball valve according to claim 4, wherein: The inner ring wall of the support ring (1) is integrally formed with an annular support plate (11) on the side away from the first sealing ring (2). When the first sealing ring (2) is connected to the support ring (1), the first sealing ring (2) and the annular support plate (11) fit tightly together.

6. The complementary double-layer elastomeric seal ring for a ball valve according to claim 5, wherein: The second sealing ring (3) has an inner mounting groove (30) inside, and a bellows (31) is fixedly installed inside the inner mounting groove (30). Both ends of the bellows (31) are fixedly connected to both ends of the inner mounting groove (30).

7. The complementary double-layer elastomeric seal ring for a ball valve according to claim 6, characterized in that: The length of the threaded tube (32) is the same as the depth of the outer mounting groove (20), the first sealing ring (2) is made of rubber, and the second sealing ring (3) is made of silicone.

8. The complementary double-layer elastic sealing ring of the ball valve as described in claim 7, characterized in that: The diameters of the inner ring walls of the support ring (1), the first sealing ring (2), and the second sealing ring (3) are equal.

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