An Airborne Flame Suppressor with Adjustable Pore

Abstract

The invention relates to the technical field of aerospace equipment, and discloses a hole adjustable type onboard flame suppressor. The hole adjustable type onboard flame suppressor comprises a shelland a fire resistant unit, and the fire resistant unit is fixedly installed on the inner side wall of the shell. According to the hole adjustable type onboard flame suppressor, the shapes of shape memory alloy sections and dividing parts on adjusting rods are adjusted along with changing of the temperature, during normal operation, the maximum cross section area of fire resistant channels is ensured, and normal flowing of gas in a ventilation system is ensured; under the deflagration high-temperature condition, the shape memory alloy sections and the dividing parts divide the fire resistant channels, the cross section area of fire resistant channels is decreased, and the overall fire resistant effect is improved; in addition, the cross section area of fire resistant channels is small relative to that of existing fire resistant channels, blockage is not prone to occurring, and daily cleaning and maintaining are facilitated through the large cross section area; and meanwhile, normal using cannot be influenced by slight deformation, and slight deformation can be corrected more conveniently.

Description

technical field [0001] The invention relates to the technical field of aerospace equipment, in particular to an airborne flame suppressor with adjustable aperture. Background technique [0002] As a "passive" safety protection device, the airborne flame suppressor has been widely used in various aircraft ventilation systems and carburetor steam discharge systems to prevent external fire sources such as lightning from invading the aircraft fuel system. The flame suppressor is as attached figure 1 As shown, it includes the shell, the fire arresting unit, and the connecting flange at the bottom, and its core is the fire arresting unit 2. The fire arresting unit 2 divides the section of the pipeline into multiple channels with small enough diameters, and the flame moves in these narrow channels for a certain period of time. It will turn off after the distance. [0003] Generally speaking, the smaller the pore diameter of the flame retardant unit, the longer the channel will bri...

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Problems solved by technology

[0003] Generally speaking, the smaller the pore diameter of the flame retardant unit, the longer the channel will bring better quenching ability, but too small diameter or too long channel will increase the resistance of gas flow and affect the ventilation capacity of the normal ventilation system. At the same time, if the diameter is too large or the channel is too long, it will easily lead to ice blockage and dirty blockage, which further reduces the ventilation capacity of the ventilation system. Due to the need to take into account both the ventilation capacity and the fire resistance capacity, the two capabilities of the fire resistance unit cannot be fully utilized. In the best state, the design of the ventilation system of the aircraft needs to be designed with greater redundancy to ensure that the ventilation capacity and fire resistance of the ventilation system meet the safety requirements

[0004] Furthermore, due to the smaller diameter and longer length of the fire arresting unit, it is not only more prone to ice blockage and dirty blockage than normal channels, but also not easy to clean, and it takes longer to maintain it. , because the fire retardant unit is usually designed in one piece, the damage and deformation need to be replaced as a whole, which also increases the cost of use

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