Sealing structure of containment isolating valve

Abstract

The utility model discloses a containment isolation valve sealing structure which comprises a valve seat, first connectors fixedly connected to the outer surfaces of the two sides of the valve seat, first connecting openings formed in the inner walls of the first connectors, second connectors movably connected to the outer surfaces of the two sides of the first connectors, and second connecting openings formed in the inner walls of the second connectors. A second connecting opening is formed in the inner wall of the second connecting body, third connecting bodies are fixedly connected to the outer surfaces of the two sides of the second connecting body, and a valve body is fixedly connected to the upper portion of the valve seat. By means of the structure, the U-shaped sealing rubber strip and the V-shaped spring are arranged, the V-shaped spring serves as an auxiliary element, the effective sealing performance can be kept under the static condition and the dynamic condition, in the static state, the V-shaped spring provides constant pre-tightening force, it is ensured that the sealing ring and the sealed ring are tightly attached, and medium leakage is prevented; in the dynamic state, the buffering effect of the V-shaped spring can compensate abrasion, caused by rotation of the valve plate and the valve rod, of the U-shaped sealing rubber strip, and therefore the sealing effect of the U-shaped sealing rubber strip is maintained all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of containment isolation valves, in particular to a containment isolation valve sealing structure. Background Art

[0002] Isolation valves belong to the switch type of valves, which are only in the open or closed state. Unlike switch valves, they basically have certain requirements for leakage levels, and relatively speaking, the safety requirements are higher than switch valves. Sealing is to prevent leakage, so the valve sealing principle is also studied from the perspective of preventing leakage. There are many types of valves, but the basic function is the same, that is, to connect or cut off the medium flow. Therefore, the valve sealing problem is very prominent.

[0003] The traditional containment isolation valve uses two sealing rings to clamp a non-metallic sealing ring, and uses the non-metallic sealing ring as the sealing surface. Its characteristic is that it utilizes the good elasticity of the non-metallic sealing ring to enhance the sealing effect. However, in order to ensure the absolute sealing between the layers of the sealing ring, adhesives are needed. However, the materials used in nuclear power valves have very high requirements and many restrictions, and have very strict requirements on the content of ions such as chlorine, fluorine, and sulfur. It is difficult for adhesives to meet the standards. Repeated switching of the isolation valve will cause wear of the sealing ring. After several times of wear, it is difficult to achieve a sealing effect, which will lead to material leakage and the need to frequently replace the sealing strips.

[0004] To this end, we propose a containment isolation valve sealing structure. Utility Model Content

[0005] The utility model provides a containment isolation valve sealing structure, which can maintain effective sealing performance under both static and dynamic conditions and ensure normal operation of the equipment by arranging a U-shaped sealing strip and a V-shaped spring and using the V-shaped spring as an auxiliary component.

[0006] In order to achieve the above-mentioned purpose, a containment isolation valve sealing structure is provided, wherein the outer surfaces on both sides of the valve seat are fixedly connected with a first connecting body, the inner wall of the first connecting body is provided with a first connecting port, the outer surfaces on both sides of the first connecting body are movably connected with a second connecting body, the inner wall of the second connecting body is provided with a second connecting port, the outer surfaces on both sides of the second connecting body are fixedly connected with a third connecting body, and the top of the valve seat is fixedly connected with a valve body.

[0007] According to the containment isolation valve sealing structure, the first connection port and the second connection port are the same in number, size and shape. After the first connection port and the second connection port are aligned, the first connector and the second connector are connected by bolt connection. The number of the first connector, the second connector and the third connector is two. After the first connection port and the second connection port are aligned, the first connector and the second connector are connected by bolt connection. The strength of the material of the bolt itself is relatively high, and the threaded fit can provide a good force transmission effect. Therefore, the bolt connection can withstand a large load and has high reliability. It does not require welding or other fixing operations, is easy to disassemble, and is convenient for equipment maintenance and replacement, reducing maintenance costs.

[0008] According to the containment isolation valve sealing structure, the inner wall of the valve body is provided with an installation opening, and the inner wall of the installation opening is movably connected with a valve core. The movably connected mode here is an interference fit mode, in which the sizes of the valve core and the valve body are designed to be slightly different, and they are tightly matched by press fitting or heating, cooling and other methods to achieve higher sealing performance and wear resistance.

[0009] According to the containment isolation valve sealing structure, a threaded hole is provided on the inner wall of one side of the valve body, and a rotating hand wheel is threadedly connected to the inner wall of the threaded hole, and the rotating hand wheel is composed of a trident star with a circle added to the outer side. By providing the rotating hand wheel, it is convenient to manually operate the valve core and control the rotation angle of the valve stem.

[0010] According to the containment isolation valve sealing structure, a threaded hole is provided on the bottom inner wall of the valve core, a valve stem is threadedly connected to the inner wall of the threaded hole, a valve plate is fixedly connected to the outer surface of the valve stem, a threaded hole is provided on the inner wall of the valve seat, and the threaded hole and the valve stem are threadedly connected to the inner wall of the valve seat. The threaded hole is provided to facilitate the disassembly and replacement of the valve stem and the valve plate by threaded connection.

[0011] According to the containment isolation valve sealing structure, a sealing strip groove is provided on the inner wall of the valve seat, the surface of the sealing strip groove is flat and the groove is circular. The provision of the sealing strip groove is beneficial for storing the sealing strip.

[0012] According to the sealing structure of a containment isolation valve, the inner wall of the sealing strip groove is movably connected with a U-shaped sealing strip, the inner wall of the U-shaped sealing strip is provided with a spring groove, and the inner wall of the spring groove is elastically connected with a V-shaped spring. By providing a U-shaped sealing strip and a V-shaped spring, and using the V-shaped spring as an auxiliary component, effective sealing performance can be maintained under both static and dynamic conditions. In static conditions, the constant preload provided by the V-shaped spring ensures that the sealing ring and the sealed ring fit tightly to prevent medium leakage; in dynamic conditions, the buffering effect of the V-shaped spring can compensate for the wear of the U-shaped sealing strip caused by the rotation of the valve plate and the valve stem, thereby always maintaining the sealing effect of the U-shaped sealing strip, extending the service life of the U-shaped sealing strip and related components, and ensuring the normal operation of the equipment.

[0013] The beneficial effects of the utility model: by arranging a U-shaped sealing strip and a V-shaped spring, with the V-shaped spring as an auxiliary component, effective sealing performance can be maintained under both static and dynamic conditions. Under static conditions, the constant preload force provided by the V-shaped spring ensures that the sealing ring and the sealed ring fit tightly to prevent medium leakage; under dynamic conditions, the buffering effect of the V-shaped spring can compensate for the wear of the U-shaped sealing strip caused by the rotation of the valve plate and the valve stem, thereby always maintaining the sealing effect of the U-shaped sealing strip, extending the service life of the U-shaped sealing strip and related components, and ensuring the normal operation of the equipment.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is a three-dimensional structural diagram of a containment isolation valve sealing structure of the utility model;

[0017] Figure 2 This is a right side view of a containment isolation valve sealing structure of the utility model with the valve plate not opened;

[0018] Figure 3 This is a right view of a containment isolation valve sealing structure of the utility model after the valve plate is opened;

[0019] Figure 4 It is an enlarged view of the sealing structure A of a containment isolation valve of the utility model.

[0020] Figure 5 The utility model is a three-dimensional structural diagram of a valve seat of a containment isolation valve sealing structure.

[0021] Figure 6 It is a cross-sectional view of a sealing strip of a sealing structure of a containment isolation valve of the utility model.

[0022] Legend:

[0023] 1. Valve seat; 2. First connector; 3. First connector; 4. Second connector; 5. Second connector; 6. Third connector; 7. Valve body; 8. Valve core; 9. Rotating hand wheel; 10. Sealing strip groove; 11. U-shaped sealing strip; 12. V-shaped spring; 81. Valve stem; 82. Valve plate. DETAILED DESCRIPTION

[0024] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0025] Reference Figures 1 to 6 The utility model embodiment is a containment isolation valve sealing structure, which includes a valve seat 1, the outer surfaces of both sides of the valve seat 1 are fixedly connected with a first connecting body 2, the inner wall of the first connecting body 2 is provided with a first connecting port 3, the outer surfaces of both sides of the first connecting body 2 are movably connected with a second connecting body 4, the inner wall of the second connecting body 4 is provided with a second connecting port 5, the outer surfaces of both sides of the second connecting body 4 are fixedly connected with a third connecting body 6, and the top of the valve seat 1 is fixedly connected with a valve body 7.

[0026] The number, size and shape of the first connection ports 3 and the second connection ports 5 are the same. After the first connection ports 3 and the second connection ports 5 are aligned, the first connection body 2 and the second connection body 4 are connected by bolts. The number of the first connection body 2, the second connection body 4 and the third connection body 6 are all two.

[0027] The inner wall of the valve body 7 is provided with an installation opening, and the inner wall of the installation opening is movably connected with a valve core 8. The main body of the valve body 7, the containment isolation valve, is made of stainless steel.

[0028] A threaded hole is provided on the inner wall of one side of the valve body 7, and a rotating hand wheel 9 is threadedly connected to the inner wall of the threaded hole. The rotating hand wheel 9 is composed of a trident star with a circle added to the outer side. The rotating hand wheel 9 is used to control the opening and closing of the valve core 8.

[0029] The bottom inner wall of the valve core 8 is provided with a threaded hole, the inner wall of the threaded hole is threadedly connected with a valve stem 81, the outer surface of the valve stem 81 is fixedly connected with a valve plate 82, and the inner wall of the valve seat 1 is provided with a threaded hole, the threaded hole and the valve stem 81 are threadedly connected to the inner wall of the valve seat 1. The valve plate 8 is a key component of the containment isolation valve, which is a circular thin sheet used to adjust the flow rate of the medium and is made of metal material. The inner wall of the valve seat 1 is provided with a sealing strip groove 10, the surface of the sealing strip groove 10 is flat and the notch is circular. The valve seat 1 is used to prevent leakage of the medium and is generally made of polytetrafluoroethylene (PTFE) material.

[0030] The inner wall of the sealing strip groove 10 is movably connected with a U-shaped sealing strip 11 , the inner wall of the U-shaped sealing strip 11 is provided with a spring groove, and the inner wall of the spring groove is elastically connected with a V-shaped spring 12 .

[0031] In the containment isolation valve, a valve cover is threadedly connected to the top of the valve body 7, and a sealing gasket is used to seal the valve cover and the valve body 7. The sealing gasket is usually made of rubber or metal material and can form an effective seal under pressure.

[0032] Working principle: When it is needed, align the first connection ports 3 on the two first connection bodies 2 with the second connection ports 5 on the two second connection bodies 4, connect the first connection body 2 and the second connection body 4 by bolts, install the U-shaped sealing strip 11 on the inner wall of the sealing strip groove 10, and then thread the valve stem 81 with the bottom of the valve core 82 and the inner wall of the valve seat 1, manually turn the rotating hand wheel 9, the rotating hand wheel 9 drives the valve core 8 to rotate, and then drives the valve stem 81 on the inner wall of the valve core 8 to rotate, when it is fixed with the valve stem 81 When the fixedly connected valve plate 82 rotates to 90°, a seal is formed between the valve plate 82 and the valve seat 1. At this time, due to the constant preload provided by the V-shaped spring 12, the sealing ring and the sealed ring are ensured to fit tightly to prevent medium leakage. After long-term use, the buffering effect of the V-shaped spring 12 can compensate for the wear of the U-shaped sealing strip 11 caused by the rotation of the valve plate 82 and the valve stem 81, thereby always maintaining the sealing effect of the U-shaped sealing strip 11, extending the service life of the U-shaped sealing strip 11 and related components, and ensuring the normal operation of the equipment.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A containment isolation valve sealing structure, comprising a valve seat (1), characterized in that: The outer surfaces on both sides of the valve seat (1) are fixedly connected to a first connecting body (2), the inner wall of the first connecting body (2) is provided with a first connecting port (3), the outer surfaces on both sides of the first connecting body (2) are movably connected to a second connecting body (4), the inner wall of the second connecting body (4) is provided with a second connecting port (5), the outer surfaces on both sides of the second connecting body (4) are fixedly connected to a third connecting body (6), and the top of the valve seat (1) is fixedly connected to a valve body (7).

2. A containment isolation valve sealing structure according to claim 1, characterized in that: The first connection ports (3) and the second connection ports (5) are identical in number, size and shape. After the first connection ports (3) and the second connection ports (5) are aligned, the first connection body (2) and the second connection body (4) are connected by bolts. The number of the first connection body (2), the second connection body (4) and the third connection body (6) are all two.

3. A containment isolation valve sealing structure according to claim 1, characterized in that: The inner wall of the valve body (7) is provided with a mounting opening, and the inner wall of the mounting opening is movably connected to a valve core (8).

4. A containment isolation valve sealing structure according to claim 1, characterized in that: A threaded hole is formed on the inner wall of one side of the valve body (7), and a rotating hand wheel (9) is threadedly connected to the inner wall of the threaded hole. The rotating hand wheel (9) is composed of a trident with a circle added to the outer side.

5. A containment isolation valve sealing structure according to claim 3, characterized in that: A threaded hole is formed on the inner wall of the bottom of the valve core (8), a valve stem (81) is threadedly connected to the inner wall of the threaded hole, a valve plate (82) is fixedly connected to the outer surface of the valve stem (81), and a threaded hole is formed on the inner wall of the valve seat (1), the threaded hole and the valve stem (81) are threadedly connected to the inner wall of the valve seat (1).

6. A containment isolation valve sealing structure according to claim 1, characterized in that: The inner wall of the valve seat (1) is provided with a sealing strip groove (10), the surface of the sealing strip groove (10) is flat and the groove opening is circular.

7. A containment isolation valve sealing structure according to claim 6, characterized in that: The inner wall of the sealing strip groove (10) is movably connected to a U-shaped sealing strip (11), the inner wall of the U-shaped sealing strip (11) is provided with a spring groove, and the inner wall of the spring groove is elastically connected to a V-shaped spring (12).

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