Switching control valve for state of aircraft cargo compartment fire extinguishing system

Abstract

The invention relates to a switching control valve for the state of an aircraft cargo compartment fire extinguishing system, and the switching control valve is particularly suitable for serving as a diversion element of extinguishing agents in an aircraft cargo compartment fire extinguishing pipeline. A flow control device comprises a valve body (1), a high-speed inlet (2) and a low-speed inlet (3), wherein a sliding type valve element (4), a valve cavity (5), a valve base (6) and an elastic force control switch (7) are arranged in the valve body, a slider (8) is arranged on the periphery of the sliding type valve element (4), a conical-angle face (9) is arranged at one end, close to the low-speed inlet (3), of the valve base (6), and a drying filtering cavity (10) and a throttling cavity (11) are formed in the valve cavity (5). The switching control valve meets different flow speed requirements and different requirements for extinguishing agents when fire happens to an aircraft, the using number of pipelines in the aircraft is reduced, the stability and the high efficiency of the fire extinguishing system of the aircraft are guaranteed, water, solid particles and other impurities in the extinguishing agents can be removed, and icing and blocking are avoided.

Description

technical field [0001] The invention relates to the field of fire extinguishing agent flow mode control, in particular to a switching control valve for the state of an aircraft cargo compartment fire extinguishing system. Background technique [0002] When the cargo hold smoke detectors detected a fire, the crew activated the cargo hold fire suppression system. Under normal circumstances, the aircraft cargo compartment is equipped with two sets of fire extinguishing systems: the high-speed fire extinguishing system is used to "extinguish the fire in the cargo compartment". In order to "stabilize the concentration of fire extinguishing agent in the cargo compartment after fire extinguishing", prevent re-ignition in the cargo compartment, and ensure that the concentration of fire extinguishing agent remains above 3% for at least 195 minutes. In the existing system, in order to meet the different fire extinguishing agent flow requirements of the two fire extinguishing systems,...

AI Technical Summary

Problems solved by technology

[0004] Secondly, in the existing design, the pipes extending from the fire extinguishing bottles of the two sets of fire extinguishing systems are distributed in parallel. This distribution method lengthens the length of the fire extinguishing pipes in the system, consumes a lot of materials, and the aircraft bears a heavy weight, which brings unnecessary energy. loss

[0005] Finally, the shell in the existing flow control device is an integral shell

During use, it is easy for the dry parts to absorb water and gradually become saturated and cannot continue to work, or the internal components are damaged

When the above situation occurs, the entire set of flow control device is scrapped, and the recycling ability is poor

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