Ultralow-temperature ball valve sealing structure

Abstract

The utility model discloses an ultra-low temperature ball valve sealing structure, which belongs to the technical field of ball valves and comprises a ball valve main body and two connecting pipes, first sealing grooves are arranged on two sides of the ball valve main body, second sealing grooves are arranged on the close surfaces of the two connecting pipes, and the first sealing grooves are communicated with the second sealing grooves. The first sealing groove and the second sealing groove located on one side are internally provided with the same sealing gasket, two folding cavities are formed in the sealing gasket, and a plurality of springs are connected into the two folding cavities. According to the utility model, the sealing gasket is inserted into the first sealing groove and the second sealing groove, and when the connecting pipe and the ball valve main body are connected together through the bolt and the nut, the deformed sealing gasket can connect the connecting pipe and the ball valve main body together in a high-sealing manner, and the springs in the folding cavity are contracted; the plurality of contracted springs can tightly lock the external nut outside the bolt, so that the nut is not easy to loosen outside the bolt, and the ball valve main body and the connecting pipe can be stably connected together by the sealing structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of ball valves, and in particular relates to a sealing structure of an ultra-low temperature ball valve. Background Art

[0002] Cryogenic ball valves are mainly used in chemical plants such as ethylene and liquefied natural gas, and output liquid cryogenic media such as ethylene, liquid oxygen, and liquid hydrogen. These media are not only flammable and explosive, but also gasify when heated, and the volume expands hundreds of times. Moreover, these media have strong permeability and are easy to leak, making them difficult to process and manufacture. The valve seat is a detachable surface part in the valve, which is used to support the fully closed position of the valve core and form a sealing pair. Generally, the valve seat diameter is the maximum flow diameter of the valve.

[0003] However, the sealing structure of the existing cryogenic ball valve is a circular sealing gasket, but the effect of the sealing gasket is single and the sealing effect is not good, so a cryogenic ball valve sealing structure is needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing structure of an ultra-low temperature ball valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealing structure of an ultra-low temperature ball valve, comprising a ball valve body and two connecting pipes, wherein a first sealing groove is provided on both sides of the ball valve body, and a second sealing groove is provided on the adjacent sides of the two connecting pipes, and the same sealing gasket is provided in the first sealing groove and the second sealing groove on one side, and two folding cavities are provided in the sealing gasket, and a plurality of springs are connected in the two folding cavities.

[0006] By setting the above structure, the sealing gasket is inserted into the first sealing groove and the second sealing groove, and when the connecting pipe and the ball valve body are connected together by bolts and nuts, the two folding cavities in the sealing gasket are deformed and then stuck into the corresponding parts of the first sealing groove and the second sealing groove, so that the deformed sealing gasket can connect the connecting pipe and the ball valve body together with high sealing, and the multiple springs in the folding cavity are contracted, and the contracted multiple springs can tightly lock the external nut outside the bolt, so that the nut is not easy to loosen outside the bolt, so that the sealing structure can firmly connect the ball valve body and the connecting pipe together.

[0007] As a preferred embodiment, the shape of the sealing gasket is set to be circular.

[0008] As a preferred implementation, the shapes of the first sealing groove and the second sealing groove are both circular.

[0009] As a preferred implementation manner, the first sealing groove and the second sealing groove are respectively arranged outside a plurality of springs.

[0010] As a preferred embodiment, the plurality of springs located in the folding cavity are arranged in a circular array.

[0011] By providing a spring, a folding cavity and a sealing gasket, when the folding cavity is not squeezed by an external force, the two folding cavities are both expanded under the action of a plurality of spring elastic forces, so that the fully expanded sealing gasket can be smoothly moved out of the first sealing groove and the second sealing groove.

[0012] As a preferred implementation, two portions of trapezoidal protrusions are provided on the outside and inside of the sealing gasket.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model is provided with a sealing gasket, a spring, a folding cavity, a first sealing groove and a second sealing groove. The sealing gasket is inserted into the first sealing groove and the second sealing groove. When the connecting pipe and the ball valve body are connected together by bolts and nuts, the two folding cavities in the sealing gasket are deformed and then inserted into the corresponding parts in the first sealing groove and the second sealing groove, so that the deformed sealing gasket can connect the connecting pipe and the ball valve body together with high sealing, and the plurality of springs in the folding cavity are contracted. The contracted plurality of springs can tightly lock the external nut outside the bolt, so that the nut is not easy to loosen outside the bolt, so that the sealing structure can stably connect the ball valve body and the connecting pipe together.

[0015] The utility model is provided with a spring, a folding cavity and a sealing gasket. When the folding cavity is not squeezed by an external force, the two folding cavities are both unfolded under the action of a plurality of spring elastic forces, so that the fully unfolded sealing gasket can be smoothly moved out from the first sealing groove and the second sealing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model in a frontal perspective;

[0017] Figure 2 It is a schematic diagram of the sectional structure of the utility model in a front view;

[0018] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0019] Figure 4 This is a schematic diagram of the sealing gasket structure of the utility model.

[0020] In the figure: 1. ball valve body; 2. first sealing groove; 3. sealing gasket; 4. folding chamber; 5. spring; 6. connecting pipe; 7. second sealing groove. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the embodiments.

[0022] The following examples are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0023] See also Figure 1-4 The utility model provides a sealing structure of an ultra-low temperature ball valve, including a ball valve body 1 and two connecting pipes 6. Both sides of the ball valve body 1 are provided with a first sealing groove 2, and the sides of the two connecting pipes 6 that are close to each other are provided with a second sealing groove 7. The first sealing groove 2 and the second sealing groove 7 on one side are provided with the same sealing gasket 3. The shape of the sealing gasket 3 is set to be circular. Two folding cavities 4 are provided in the sealing gasket 3. The shapes of the first sealing groove 2 and the second sealing groove 7 are both set to be circular. A plurality of springs 5 ​​are connected in the two folding cavities 4. The first sealing groove 2 and the second sealing groove 7 are respectively arranged outside the plurality of springs 5. The plurality of springs 5 ​​located in the folding cavity 4 are arranged in a circumferential array. The outside and the inside of the sealing gasket 3 are provided with two-part trapezoidal protrusions. By providing the spring 5, the folding cavity 4 and the sealing gasket 3, when the folding cavity 4 is not squeezed by external force, the two folding cavities 4 are both expanded under the action of the elastic force of the plurality of springs 5, so that the fully expanded sealing gasket 3 can be smoothly moved out of the first sealing groove 2 and the second sealing groove 7.

[0024] The working principle and use process of the utility model are as follows: when the structure needs to be used, the sealing gasket 3 is respectively inserted into the first sealing groove 2 and the second sealing groove 7, and then when the connecting pipe 6 and the ball valve body 1 are connected together with bolts, the sealing gasket 3 will be squeezed, and the squeezed sealing gasket 3 will be folded and deformed to produce a bulge, and the bulged parts inside and outside the sealing gasket 3 are stuck in the corresponding structures in the first sealing groove 2 and the second sealing groove 7, so that the deformed sealing gasket 3 can seal the gap between the connecting pipe 6 and the ball valve body 1.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cryogenic ball valve sealing structure, comprising a ball valve body (1) and two connecting pipes (6), characterized in that: The ball valve body (1) is provided with first sealing grooves (2) on both sides, and the two connecting pipes (6) are provided with second sealing grooves (7) on the sides close to each other. The first sealing groove (2) and the second sealing groove (7) on one side are provided with the same sealing gasket (3), and the sealing gasket (3) is provided with two folding cavities (4), and the two folding cavities (4) are connected with a plurality of springs (5).

2. The ultra-low temperature ball valve sealing structure according to claim 1, characterized in that: The shape of the sealing gasket (3) is set to be circular.

3. The ultra-low temperature ball valve sealing structure according to claim 1, characterized in that: The shapes of the first sealing groove (2) and the second sealing groove (7) are both circular.

4. The ultra-low temperature ball valve sealing structure according to claim 1, characterized in that: The first sealing groove (2) and the second sealing groove (7) are respectively arranged outside a plurality of springs (5).

5. The ultra-low temperature ball valve sealing structure according to claim 1, characterized in that: A plurality of springs (5) located in the folding cavity (4) are arranged in a circular array.

6. The ultra-low temperature ball valve sealing structure according to claim 1, characterized in that: The sealing gasket (3) is provided with two portions of protrusions in the form of a trapezoidal ring both on the outside and inside.

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