Liquid hydrogen stop valve with vacuum valve shaft

Abstract

A liquid hydrogen stop valve with a vacuum valve shaft comprises a valve body, an inlet and an outlet are formed in the two sides of the valve body respectively, a valve element and the valve shaft are arranged in the valve body, a valve deck is arranged on the valve body, the lower end of the valve shaft is connected with the valve element, and the upper end of the valve shaft upwards penetrates through the valve deck and then is connected with a driving mechanism. The valve shaft is composed of a first shaft section, a second shaft section and a third shaft section which are sequentially connected from bottom to top, a vacuum cavity is formed in the second shaft section, a first O-shaped ring is arranged between the valve deck and the valve body, and a second O-shaped ring is arranged between the valve deck and the valve shaft. The vacuum cavity in the valve shaft is vacuumized, so that heat conduction between the valve body and the valve cover through the valve shaft can be effectively reduced, the heat preservation performance of the liquid hydrogen storage and transportation system is improved, and resource waste is reduced. The valve shaft and the valve cover are both welded to the corrugated pipe, O-shaped rings are additionally arranged to provide multiple seals, and the sealing possibility is further improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a valve, in particular to a liquid hydrogen stop valve with a vacuum valve shaft. Background Art

[0002] The storage and transportation temperatures of liquid hydrogen and liquid helium are generally below -269°C. When external heat enters the liquid hydrogen storage and transportation system, it vaporizes some of the liquid hydrogen and eventually discharges it, resulting in waste. The liquid hydrogen shut-off valve is a key device specifically designed for use with liquid hydrogen media, used to connect or disconnect the flow of liquid hydrogen in the pipeline. Existing liquid hydrogen shut-off valves include a valve body, valve core, and valve shaft. During operation, external heat can easily enter the valve shaft through heat conduction, causing the liquid hydrogen to vaporize and resulting in resource waste. Summary of the Invention

[0003] The purpose of the utility model is to provide a liquid hydrogen stop valve with a vacuum valve shaft, which solves the technical problem in the prior art that the valve shaft easily transfers heat and causes the liquid hydrogen to vaporize.

[0004] The utility model discloses a liquid hydrogen stop valve with a vacuum valve shaft, comprising a valve body, an inlet and an outlet are respectively provided on both sides of the valve body, a valve core and a valve shaft are provided in the valve body, a valve cover is provided on the valve body, the lower end of the valve shaft is connected to the valve core, and the upper end of the valve shaft is connected to the driving mechanism after passing through the valve cover upward, the valve shaft is composed of a first shaft section, a second shaft section, and a third shaft section which are connected in sequence from bottom to top, a vacuum chamber is provided inside the second shaft section, a bellows is sleeved on the outside of the third shaft section, a first O-ring is provided between the valve cover and the valve body, and a second O-ring is provided between the valve cover and the valve shaft.

[0005] Furthermore, the valve shaft and the valve cover are both welded to the bellows.

[0006] Furthermore, a bellows is provided in the valve body, and the valve body and the valve cover are both fixedly connected to the bellows.

[0007] Compared with the prior art, the utility model has positive and obvious effects.

[0008] 1. Evacuating the vacuum chamber inside the valve shaft can effectively reduce heat conduction between the valve body and the valve cover through the valve shaft, improving the thermal insulation performance of the liquid hydrogen storage and transportation system and reducing resource waste. While ensuring the overall strength and rigidity of the valve shaft, the material mass and cross-sectional area are minimized to reduce the heat transfer capacity of the valve shaft.

[0009] 2. The valve shaft and valve cover are welded to the bellows, and O-rings are provided to provide multiple seals to further improve sealing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1This is a schematic diagram of a liquid hydrogen stop valve with a vacuum valve shaft according to the present invention.

[0011] Figure 2 for Figure 1 A partial enlarged schematic diagram. DETAILED DESCRIPTION

[0012] The following is a further description of the present invention in conjunction with an embodiment. However, the present invention is not limited to the embodiment. All similar structures and similar variations of the present invention should be included in the scope of protection of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and does not limit the technical solution of the present invention.

[0013] like Figure 1-Figure 2 As shown, the utility model is a liquid hydrogen stop valve with a vacuum valve shaft, comprising a valve body 1, wherein an inlet and an outlet are respectively provided on both sides of the valve body 1, a valve core 2 and a valve shaft 3 are provided in the valve body 1, a valve cover 4 is provided on the valve body 1, the lower end of the valve shaft 3 is connected to the valve core 2, and the upper end of the valve shaft 3 is connected to the drive mechanism 5 after passing through the valve cover 4 upward, the valve shaft 3 is composed of a first shaft section 6, a second shaft section 7, and a third shaft section 8 connected in sequence from bottom to top, a vacuum chamber 9 is provided inside the second shaft section 7, a first O-ring 11 is provided between the valve cover 4 and the valve body 1, and a second O-ring 12 is provided between the valve cover 4 and the valve shaft 3.

[0014] Furthermore, the valve shaft 3 and the valve cover 4 are both welded to the bellows 10 .

[0015] Furthermore, a bellows 10 is provided in the valve body 1 , the valve body 1 and the valve cover 4 are fixedly connected to the bellows 10 , and the bellows 10 is sleeved on the outside of the third shaft section 8 .

[0016] Specifically, the valve body 1 , valve core 2 , drive mechanism 5 , bellows 10 , etc. in this embodiment all adopt well-known solutions in the prior art, which are well understood by those skilled in the art and will not be described in detail here.

[0017] In this embodiment, the valve shaft 3 is processed in sections and then welded, and finally the vacuum chamber 9 is evacuated and sealed.

[0018] Advantages of this utility model:

[0019] 1. Evacuating the vacuum chamber 9 within the valve shaft 3 effectively reduces heat conduction between the valve body 1 and the valve cover 4 through the valve shaft 3, improving the thermal insulation performance of the liquid hydrogen storage and transportation system and reducing resource waste. While ensuring the overall strength and rigidity of the valve shaft 3, the material mass and cross-sectional area are minimized to reduce the heat transfer capacity of the valve shaft 3.

[0020] 2. The valve shaft 3 and the valve cover 4 are welded to the bellows 10, and an O-ring is provided to provide multiple seals to further improve the sealing reliability.

Claims

1. A liquid hydrogen stop valve with a vacuum valve shaft, characterized by: The valve body comprises a valve body, an inlet and an outlet are respectively provided on both sides of the valve body, a valve core and a valve shaft are provided in the valve body, a valve cover is provided on the valve body, the lower end of the valve shaft is connected to the valve core, and the upper end of the valve shaft is connected to the driving mechanism after passing through the valve cover upward, the valve shaft is composed of a first shaft section, a second shaft section, and a third shaft section connected in sequence from bottom to top, a vacuum chamber is provided inside the second shaft section, a first O-ring is provided between the valve cover and the valve body, and a second O-ring is provided between the valve cover and the valve shaft.

2. The liquid hydrogen stop valve with a vacuum valve shaft according to claim 1, characterized in that: The valve shaft and the valve cover are both welded to the bellows.

3. The liquid hydrogen stop valve with a vacuum valve shaft according to claim 1, characterized in that: A bellows is provided in the valve body, the valve body and the valve cover are fixedly connected to the bellows, and the bellows is sleeved on the outside of the third shaft section.

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