Vacuum stop valve under zero gravity

Abstract

The invention discloses a vacuum stop valve under zero gravity. The vacuum stop valve comprises a handle, a valve element, a spring, a valve cap and a valve body. The valve element and the spring are installed in the valve body through the valve cap. One end of the valve cap is in threaded connection with the valve body and is provided with a deep groove and a shallow groove. One end of the handle provided with tenons is placed in the grooves and is used in cooperation with the valve cap. A positioning groove is formed in the bottom end face of a threaded hole in the valve cap and is used for installation of the spring. An annular sealing groove is formed in the inner wall of a through hole of the valve cap and is used for installation of a small radial seal ring. The small radial seal ring plays a role in guiding and dust prevention and prevents the valve element from waggling in the radial direction in the axial moving process. Axial soft seat sealing is adopted for internal sealing of the vacuum stop valve, sealing force is provided by the spring, and therefore reliable sealing of multiple times of opening and closing operations can be achieved; a plunger type bi-radial seal ring and a sealing retainer ring are adopted for external sealing, the two rings are mutual backups, and therefore the reliability of the valve is improved.

Description

technical field [0001] The invention relates to a vacuum cut-off valve under zero gravity, which belongs to the technical field of aerospace valves. Background technique [0002] The aerospace gas system is a pipeline system that supplies oxygen, nitrogen, air, etc. to other systems on the spacecraft, including various solenoid valves and manual valves. Among them, the vacuum stop valve is manually operated by the astronauts, and is used for the switch control of the gas supply passage. [0003] At present, ball valves are mostly used in vacuum globe valves, which have good sealing performance and reliable operation, but due to the limitations of sealing materials and structures, they cannot adapt to changes in cycle temperature, and when the number of operations is large, friction between rotating parts and filling sealing materials may be redundant. It is difficult to meet the cleanliness requirements of the aerospace gas system. [0004] National defense research requir...

AI Technical Summary

Problems solved by technology

[0003] At present, ball valves are mostly used in vacuum globe valves, which have good sealing performance and reliable operation, but due to the limitations of sealing materials and structures, they cannot adapt to changes in cycle temperature, and when the number of operations is large, friction between rotating parts and filling sealing materials may be redundant. It is difficult to meet the cleanliness requirements of the aerospace gas system

[0004] National defense research requires a life cycle covering various mechanical environments such as ground, launch, orbit, and return stages. It not only requires small mass-to-volume ratio, wide temperature range, small operating force, rapid switching, and long working life, but also can adapt to the space environment. , Valves with multiple indicators such as ergonomics and cleanliness, the above structure cannot meet the requirements

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