Needle Isolation Valve for Cold Start Micro High Pressure Gas

Abstract

A miniature high-pressure-gas needle-type isolating valve adopting cold opening comprises a valve shell, an isolating device, a hollow opening needle and a base with a safety mechanism, wherein the isolating device, the hollow opening needle and the base are arranged in the valve shell. The hollow opening needle is arranged directly opposite to the isolating device, and the upper end face of the safety mechanism makes contact with the isolating device, is heated and then shortens the distance between the hollow opening needle and the isolating device till the hollow opening needle perforates through the isolating device. The safety mechanism and the base are integrally cast, the bearing capacity of the safety mechanism is improved, the application pressure range of the isolating valve is broadened, the weight of the valve is reduced, generating of the contact thermal resistance is reduced, and the isolating valve can be opened through small power; and the temperature of the isolating device is relatively low in the opening process, and the situation that a metal interlayer is heated and molten and consequently blown broken by gas, and then chippings are generated is avoided effectively.

Description

technical field [0001] The invention relates to a technology in the field of high-pressure gas isolation, in particular to a needle-type isolation valve for cold-starting miniature high-pressure gas. Background technique [0002] Due to the needs of space propulsion missions, the gas propellant sometimes needs to be sealed in the high-pressure storage tank for several years, so the isolation valve needs to control the leakage of the propellant under high pressure conditions, and also ensure that it can still be started normally after several years . Most of the traditional isolation valves adopt the normally closed one-time design, and the fire power starting method will produce a large vibration when starting; the sealing metal is melted by heating, and the metal debris generated will block the gas channel and affect the gas flow of the filter; the use of the filter restricts the The isolation valve is further reduced; multiple heating devices are used to heat and melt the...

AI Technical Summary

Problems solved by technology

Most of the traditional isolation valves adopt the normally closed one-time design, and the fire power starting method will generate a large vibration when starting; the sealing metal is melted by heating, and the metal debris generated will block the gas channel and affect the gas flow of the filter; the use of the filter restricts the The isolation valve is further reduced; multiple heating devices are used to heat and melt the sealing metal and pad metal respectively, which consumes a lot of power

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