Shape memory alloy isolating valve

Abstract

The invention discloses a shape memory alloy isolating valve which comprises a valve body internally provided with a channel. An isolating membrane for isolating the channel is arranged in the channel, a spring is arranged on one side of the isolating membrane, the other end of the spring is connected with the valve body, and the spring is made of a shape memory alloy. According to the shape memory alloy isolating valve, the isolating membrane for isolating the channel is arranged in the channel, the isolating membrane can block distribution of fluid in the channel and play an isolating role,the isolating valve is in a closed state when the isolating membrane is intact, when the spring is heated, the spring can deform due to the physical property of the shape memory alloy, the spring extends forwards, the forward elastic force borne by the isolating diaphragm and coming from the spring is gradually increased, when the forward elastic force borne by the isolating diaphragm and appliedby the spring reaches a certain value, the isolating diaphragm can be broken and damaged, at the moment, the channel is not blocked by the isolating diaphragm, and the isolating valve can be in an open state.

Description

technical field [0001] The invention belongs to the field of isolation valves for storage systems of liquid rocket engines, in particular to a shape memory alloy isolation valve. Background technique [0002] The sealing reliability of the isolation valve is high, and it is generally a one-time job. It is usually installed in the liquid or gas path of the missile or rocket engine, and is used to isolate the propellant or high-pressure gas before the missile or rocket works; the existing isolation valve is usually Adopt the diaphragm type scheme that can meet the requirement of zero leakage, and use the electric squib as the working energy source; when working, use the electric squib to detonate the hot gas generated by the solid propellant column in the squib to directly or indirectly cut through the membrane The sheet forms a new channel in the isolation valve, thereby realizing the transition of the isolation valve from the closed state to the open state. [0003] However...

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Problems solved by technology

[0003] However, due to the installation of solid propellant powder columns in the isolation valve electric squib, there is a certain degree of danger, and there is a certain failure rate during work, so that some isolation valves use two sets of electric squibs to achieve redundancy to improve work. Reliability; however, the high temperature and high pressure gas generated instantaneously inside the valve by the electric squib of the isolation valve may cause damage to the structure of the valve shell or failure of the seal, resulting in mission failure

[0004] The working conditions required for the isolation valve electric squib itself are relatively high, and the required detonating equipment also has a certain volume and weight, which is not friendly to some new aircrafts with small structural quality and small space, and increases the aircraft weight redundancy

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