Ultralow-temperature double-eccentric butterfly valve sealing structure

Abstract

The utility model provides an ultralow temperature double eccentric butterfly valve sealing structure which comprises a valve plate and a valve body, the valve body is provided with a first sealing piece and a second sealing piece, the first sealing piece and the second sealing piece are arranged on the side close to the valve plate, the first sealing piece comprises a first epoxy resin clamping sleeve and a first alloy spring, and the second sealing piece comprises a second epoxy resin clamping sleeve and a second alloy spring. The second sealing piece comprises a second epoxy resin jacket and a second alloy spring; the epoxy resin jacket and the alloy spring are adopted as sealing materials of the ultralow-temperature double-eccentric butterfly valve, so that the bidirectional sealing requirements of low leakage and low torque can be met under the use working condition of the ultralow-temperature double-eccentric butterfly valve at the temperature of 196 DEG C below zero.

Description

Technical Field

[0001] The utility model relates to the field of butterfly valve seals, and particularly to a seal structure of a cryogenic double eccentric butterfly valve. Background Art

[0002] A butterfly valve is a simple regulating valve that mainly functions as a cut-off and throttling device. The seal structure of a butterfly valve usually uses rubber materials. Since rubber has characteristics such as corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, and low cost, and different rubbers with different properties can be selected according to different usage requirements to meet the working conditions of the butterfly valve; however, in the working conditions of a cryogenic double eccentric butterfly valve at -196 degrees Celsius, ordinary rubber materials cannot meet the requirements of low leakage and low torque for double-sided sealing. Summary of the Invention

[0003] The purpose of the utility model is to solve the above problems and provide a seal structure of a cryogenic double eccentric butterfly valve. By using an epoxy resin jacket and an alloy spring as the seal materials of the cryogenic double eccentric butterfly valve, it can achieve the requirements of low leakage and low torque for double-sided sealing in the working conditions of a cryogenic double eccentric butterfly valve at -196 degrees Celsius; to achieve the above purpose, the utility model has taken the following technical solutions.

[0004] The seal structure of a cryogenic double eccentric butterfly valve includes a valve plate and a valve body. A first seal and a second seal are provided on the valve body, and the first seal and the second seal are arranged on one side close to the valve plate. The first seal includes a first epoxy resin jacket and a first alloy spring, and the second seal includes a second epoxy resin jacket and a second alloy spring.

[0005] Further, the first epoxy resin jacket is made of a tetraphenylethane tetraglycidyl ether epoxy resin part.

[0006] Further, the second epoxy resin jacket is made of a tetraphenylethane tetraglycidyl ether epoxy resin part.

[0007] Further, the first alloy spring is made of a nickel-cobalt-based alloy part.

[0008] Further, the first alloy spring is made of an Elgiloy alloy part.

[0009] Further, the second alloy spring is made of a nickel-cobalt-based alloy part.

[0010] Further, the second alloy spring is made of an Elgiloy alloy part.

[0011] Further, the outer shape of the first epoxy resin jacket is in the shape of a flange.

[0012] Further, the outer shape of the second epoxy resin jacket is in the shape of a flange.

[0013] Further, the cross-section of the second epoxy resin jacket is in a "ji" shape.

[0014] The positive effects of the sealing structure of the ultra-low temperature double eccentric butterfly valve of the present utility model are as follows:

[0015] (1) By using epoxy resin jackets and nickel-cobalt-based alloy springs as the sealing materials for the ultra-low temperature double eccentric butterfly valve, the present utility model can meet the requirements of bidirectional sealing with low leakage and low torque under the service conditions of the ultra-low temperature double eccentric butterfly valve at -196°C. Tetraphenylethane tetraglycidyl ether epoxy resin has characteristics such as low gas permeability, good low-temperature properties, and creep resistance. At the same time, by using a double-layer Elgiloy alloy spring, it is ensured that when the low-temperature metal valve body shrinks at -196°C, the sealing lip still maintains good fitting ability.

[0016] (2) The first sealing member and the second sealing member are designed in a flange shape. When the valve plate is in the process of opening and closing, the sealing members will not displace, effectively maintaining the stability of the sealing structure and effectively ensuring the service life of the sealing members. At the same time, the first sealing member and the second sealing member are designed back-to-back, and can seal the medium fluid from two directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram provided by an embodiment of the present utility model.

[0018] The reference numerals in the figure are as follows:

[0019] 1, valve plate; 2, valve body; 3, first epoxy resin jacket; 4, first alloy spring; 5, second epoxy resin jacket; 6, second alloy spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following gives the detailed embodiments of the sealing structure of the ultra-low temperature double eccentric butterfly valve of the present utility model in conjunction with the accompanying drawings. However, it should be noted that the detailed embodiments are not used to limit the specific implementation of the present utility model. Any similar structure and its similar changes using the present utility model should be included in the protection scope of the present utility model. The description of the following embodiments refers to the attached drawings to illustrate specific embodiments in which the present utility model can be implemented. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., are only references to the directions in the attached drawings. Therefore, the directional terms used are for explaining and understanding the present utility model, rather than for limiting the present utility model.

[0021] See Figure 1Ultra-low temperature double eccentric butterfly valve sealing structure, including a valve plate 1 and a valve body 2. A first seal and a second seal are provided on the valve body 2. The first seal and the second seal are arranged on one side close to the valve plate 1. The first seal includes a first epoxy resin jacket 3 and a first alloy spring 4. The second seal includes a second epoxy resin jacket 5 and a second alloy spring 6.

[0022] The first epoxy resin jacket 3 and the second epoxy resin jacket 5 are made of tetraphenylethane tetraglycidyl ether epoxy resin parts, that is, P1031 material.

[0023] The first alloy spring 4 is made of a nickel-cobalt-based alloy part. The first alloy spring 4 is made of an Elgiloy alloy part. The second alloy spring 6 is made of a nickel-cobalt-based alloy part. The second alloy spring 6 is made of an Elgiloy alloy part.

[0024] The outer shape of the first epoxy resin jacket 3 is flange-shaped, and the cross-section of the first epoxy resin jacket 3 is "U"-shaped. The flange on the right side in the figure is arranged inside the valve body 2 to play a stabilizing role. The opening of the first epoxy resin jacket 3 faces upward, and the size of the opening of the first epoxy resin jacket 3 is matched with the first alloy spring 4. The first alloy spring 4 is arranged inside the first epoxy resin jacket 3. The lip on the side of the first epoxy resin jacket 3 close to the valve plate 1 adopts an arc design, so that the valve plate 1 can have a smooth transition when opening and closing.

[0025] The outer shape of the second epoxy resin jacket 5 is flange-shaped, and the cross-section of the second epoxy resin jacket 5 is "J"-shaped. The flange on the right side in the figure is arranged inside the valve body 2 to play a stabilizing role. The opening of the second epoxy resin jacket 5 faces downward, and the size of the opening of the second epoxy resin jacket 5 is matched with the second alloy spring 6. The second alloy spring 6 is arranged inside the second epoxy resin jacket 5. The lip on the side of the second epoxy resin jacket 5 close to the valve plate 1 adopts an arc design, so that the valve plate 1 can have a smooth transition when opening and closing. The inner diameter of the side of the second epoxy resin jacket 5 close to the valve plate 1 is smaller than the inner diameter of the side of the first epoxy resin jacket 3 close to the valve plate 1.

[0026] This technical solution is a new innovative application based on new application requirements. After the sealing structure is completed, through in-site normal temperature pressure test, low-temperature switch life test and low-temperature sealing test, the sealing shape remains good, achieving the expected use effects of low leakage, low torque and long life.

[0027] The utility model adopts an epoxy resin jacket and a nickel-cobalt-based alloy spring as the sealing materials of the cryogenic double-eccentric butterfly valve, so as to meet the requirements of bidirectional sealing with low leakage and low torque under the service conditions of the cryogenic double-eccentric butterfly valve at -196°C; the tetraphenylethane tetraglycidyl ether epoxy resin has characteristics such as low gas permeability, good low-temperature characteristics, and creep resistance; at the same time, a double-layer Elgiloy alloy spring is adopted to ensure that when the cryogenic metal valve body 2 shrinks at -196°C, the sealing lip still maintains good fitting ability. The first seal and the second seal adopt a flange-like design, so that when the valve plate 1 is in the process of opening and closing, the seal will not displace, effectively maintaining the stability of the sealing structure and effectively ensuring the service life of the seal. At the same time, the first seal and the second seal adopt a back-to-back design, which can seal the medium fluid from two directions..

Claims

1. Ultra-low temperature double eccentric butterfly valve sealing structure, characterized in that, It includes a valve plate and a valve body. A first seal and a second seal are provided on the valve body. The first seal and the second seal are arranged on one side close to the valve plate. The first seal includes a first epoxy resin jacket and a first alloy spring, and the second seal includes a second epoxy resin jacket and a second alloy spring.

2. The ultra-low temperature double eccentric butterfly valve sealing structure according to claim 1, characterized in that, The first epoxy resin jacket is made of a tetraphenylethane tetraglycidyl ether epoxy resin part.

3. The sealing structure of the cryogenic double eccentric butterfly valve according to claim 1, characterized in that, The second epoxy resin jacket is made of a tetraphenylethane tetraglycidyl ether epoxy resin part.

4. The cryogenic double-eccentric butterfly valve sealing structure according to claim 1, characterized in that, The first alloy spring is made of a nickel-cobalt-based alloy part.

5. The cryogenic double-eccentric butterfly valve sealing structure according to claim 4, characterized in that, The first alloy spring is made of an Elgiloy alloy part.

6. The super-low temperature double-eccentric butterfly valve sealing structure according to claim 1, characterized in that, The second alloy spring is made of a nickel-cobalt-based alloy part.

7. The super-low temperature double-eccentric butterfly valve sealing structure according to claim 6, characterized in that, The second alloy spring is made of an Elgiloy alloy part.

8. The sealing structure of the cryogenic double-eccentric butterfly valve according to claim 1, wherein, The outer shape of the first epoxy resin jacket is flange-shaped.

9. The sealing structure of the cryogenic double eccentric butterfly valve according to claim 1, characterized in that, The outer shape of the second epoxy resin jacket is flange-shaped.

10. The cryogenic double-eccentric butterfly valve sealing structure according to claim 9, characterized in that, The cross-section of the second epoxy resin jacket is "L"-shaped.

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