Electromechanical ventilating valve capable of controlling gas pressure inside closed cavity

Abstract

The invention discloses an electromechanical ventilating valve capable of controlling gas pressure inside a closed cavity. The electromechanical ventilating valve comprises an electric actuator (3), a valve (1), a controller (4) and a differential pressure sensor (8), wherein the electric actuator (3) is provided with a rotating shaft; the rotating shaft of the electric actuator (3) is sleeved with the valve (1), and the valve (1) is used for connecting or disconnecting a fuel tank and the outside atmosphere; the controller (4) is used for controlling rotation of the rotating shaft of the electric actuator (3); the differential pressure sensor (8) is used for transmitting collected differential pressure values of the gas pressure of the fuel tank and the pressure of the outside atmosphere to the controller (4); and two end values, which are compared with the received differential pressure values of the gas pressure of the fuel tank and the pressure of the outside atmosphere, of the upper limit and the lower limit of an aircraft fuel tank gas pressure limit range are preset in the controller (4). The electromechanical ventilating valve can substitute for two original mechanical ventilating valves and can adjust any gas pressure ranges.

Description

technical field [0001] The invention relates to an electromechanical ventilation valve for controlling gas pressure in a closed cavity, in particular to an electromechanical ventilation valve for controlling the range of gas pressure in an aircraft fuel tank. Background technique [0002] A closed cavity such as an aircraft fuel tank is a closed space for storing fuel. The oil-free space of the fuel tank is filled with gas, and the gas pressure will change as follows: As the temperature of the fuel rises, the fuel expands, and the volume of the fuel-free space compresses to make the fuel The gas pressure of the fuel tank rises. When the gas pressure of the fuel tank exceeds the ambient atmospheric pressure, the wall of the fuel tank bears positive pressure; with the consumption of fuel, the volume of the fuel-free space in the fuel tank increases, and the gas expansion of the fuel tank causes the gas pressure to drop. When the fuel tank Negative pressure occurs when the ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the prior art that two mechanical ventilation valves need to be used to realize the exhaust and bleed air of the fuel tank, increase the structural weight of the fuel tank, and the adjustment amount of the controlled pressure range is limited, the present invention provides a control valve in a closed cavity. Electromechanical vent valve for gas pressure

Images