Metal sealing structure of ball valve

Abstract

The utility model relates to the technical field of ball valves, and provides a metal sealing structure of a ball valve, which is arranged between a valve seat and a valve cover and comprises a corrugated pipe seat and a corrugated pipe. The corrugated pipe seat is of an annular tubular structure, the corrugated pipe seat and the valve deck are fixedly connected and kept sealed, and the axis of the corrugated pipe seat and the axis of the valve deck are collinear. The corrugated pipe is arranged on the corrugated pipe seat in a sleeved mode, the first end of the corrugated pipe is fixedly connected with the corrugated pipe seat and keeps sealed, and the second end of the corrugated pipe is fixedly connected with the valve seat and keeps sealed. According to the metal sealing structure of the ball valve, sealing between the valve seat and the valve body is achieved through the corrugated pipe, floating can be achieved in the working state, the absolute sealing effect can be guaranteed, the problem that a non-metal sealing ring in a conventional ball valve is abraded and leaks at the position of the valve seat is effectively solved, and the service life of the ball valve is prolonged. And the sealing effect between the valve seat and the valve body is better.

Description

Technical Field

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

[0002] Currently, existing ball valve structures incorporate a non-metallic sealing ring between the valve seat and the valve body to ensure a seal. However, this design has several limitations. For example, using a rubber sealing ring restricts the operating temperature of the ball valve; and using flexible graphite as the seal can lead to seat leakage due to axial movement of the valve seat during operation and subsequent wear over time. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a metal sealing structure for a ball valve that provides a better sealing effect between the valve seat and the valve body.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a metal sealing structure for a ball valve, disposed between the valve seat and the valve cover, including a bellows seat and a bellows;

[0005] The bellows seat is an annular tubular structure. The bellows seat is fixedly connected to the valve cover and keeps it sealed. The axis of the bellows seat is collinear with the axis of the valve cover.

[0006] The bellows is sleeved on the bellows seat, the first end of the bellows is fixedly connected to the bellows seat and kept sealed, and the second end of the bellows is fixedly connected to the valve seat and kept sealed.

[0007] Furthermore, the bellows seat has an anti-rotation groove extending along the axis, and an anti-rotation block is provided in the anti-rotation groove. The anti-rotation block is fixedly connected to the valve seat.

[0008] Furthermore, the anti-rotation groove is adapted to the anti-rotation block.

[0009] Furthermore, the outer peripheral surface of the bellows seat has an inwardly extending dustproof groove.

[0010] Furthermore, it also includes a spring that causes the valve seat to tend to move inward.

[0011] Furthermore, the first end of the spring is fixedly connected to the valve cover, and the second end of the spring is fixedly connected to the valve seat.

[0012] The beneficial effects of this utility model are as follows: The metal sealing structure of the ball valve provided by this utility model uses a bellows to achieve the seal between the valve seat and the valve body. It can float in the working state and ensure an absolute sealing effect. It effectively solves the problem of wear and leakage at the valve seat position encountered by non-metallic sealing rings in conventional ball valves, and makes the sealing effect between the valve seat and the valve body better. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model assembled inside a ball valve.

[0014] Reference numerals: 10-ball, 20-valve seat, 30-valve cover, 40-bellows seat, 50-bellows, 60-spring, 70-anti-rotation block. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] In this application, unless otherwise expressly specified and limited, the terms "connection" 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 according to the specific circumstances.

[0017] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0018] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0019] like Figure 1 As shown, this utility model provides a metal sealing structure for a ball valve, which is disposed inside the ball valve, which includes a ball 10, a valve seat 20, and a valve cover 30. This utility model also includes a bellows seat 40 and a bellows 50 disposed between the valve seat 20 and the valve cover 30.

[0020] The bellows seat 40 is an annular tubular structure, and is fixedly connected to the valve cover 30 and maintains a seal. The bellows seat 40 is arranged laterally, and the axis of the bellows seat 40 is collinear with the axis of the valve cover 30.

[0021] The bellows 50 is arranged laterally and sleeved on the bellows seat 40. The first end of the bellows 50 is fixedly connected to the bellows seat 40 and maintains a seal, while the second end of the bellows 50 is fixedly connected to the valve seat 20 and maintains a seal. The bellows 50 is made of metal. Compared with traditional non-metallic sealing rings, the bellows 50 is suitable for various working conditions, including high temperature, low temperature, and normal temperature. It is not easily deformed and has a wide range of applications.

[0022] This utility model uses a bellows 50 to achieve the seal between the valve seat 20 and the valve body. It can float in the working state and ensure an absolute sealing effect, effectively solving the problem of wear and leakage at the valve seat 20 position encountered by non-metallic sealing rings in conventional ball valves, resulting in a better sealing effect between the valve seat 20 and the valve body.

[0023] Traditional non-metallic sealing rings are difficult to guarantee the sealing performance of the valve seat 20 under high and low temperature environments, and leakage is prone to occur during use. However, this utility model fundamentally solves this problem from a structural perspective. This structure does not require non-metallic sealing rings and does not have the problem of poor sealing performance of non-metallic parts under high and low temperatures, greatly improving the sealing reliability of the ball valve seat 20.

[0024] In one embodiment, the bellows seat 40 has an anti-rotation groove extending along the axis, and an anti-rotation block 70 is provided in the anti-rotation groove. The anti-rotation block 70 is fixedly connected to the valve seat 20.

[0025] The anti-rotation groove and the anti-rotation block 70 work together to limit the movement and prevent the bellows seat 40 and the valve seat 20 from rotating during operation, thereby improving the overall stability of the ball valve.

[0026] In one embodiment, the anti-rotation groove is adapted to the anti-rotation block 70 for better fit together.

[0027] In one embodiment, the outer peripheral surface of the bellows seat 40 has an inwardly extending dustproof groove to prevent external dust and other impurities from contaminating the flow medium inside the ball valve.

[0028] In one embodiment, a spring 60 is also included, which tends to move the valve seat 20 inward. The spring 60 enables the valve seat 20 to press firmly against the ball 10, further improving the sealing between the two.

[0029] In one embodiment, the first end of the spring 60 is fixedly connected to the valve cover 30, and the second end of the spring 60 is fixedly connected to the valve seat 20.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A metal seal structure of a ball valve provided between a valve seat and a bonnet, characterized by: The bellows seat and the bellows are included; The bellows seat is an annular tubular structure, which is fixedly connected with the valve cover and kept sealed, and the axial center line of the bellows seat is collinear with the axial center line of the valve cover; The bellows is sleeved on the bellows seat, the first end of the bellows is fixedly connected with the bellows seat and kept sealed, and the second end of the bellows is fixedly connected with the valve seat and kept sealed.

2. A metal-to-metal seal for a ball valve as defined in claim 1, wherein: A rotation-preventing groove extending along the axial line is formed on the bellows seat, and a rotation-preventing block is arranged in the rotation-preventing groove, which is fixedly connected with the valve seat.

3. A metal-to-metal seal for a ball valve as defined in claim 2, wherein: The rotation-preventing groove is adapted to the rotation-preventing block.

4. A metal-to-metal seal for a ball valve as defined in claim 1, wherein: A dust-preventing groove extending inwardly is formed on the outer circumferential surface of the bellows seat.

5. A metal-to-metal seal for a ball valve as defined in claim 1, wherein: A spring is further included, which makes the valve seat have a tendency to move inwardly.

6. A metal-to-metal seal for a ball valve as defined in claim 5, wherein: The first end of the spring is fixedly connected with the valve cover, and the second end of the spring is fixedly connected with the valve seat.

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