Pressure-maintaining oil tank of aircraft

Abstract

The invention discloses a pressure-maintaining oil tank of an aircraft. An oil tank pressure-maintaining system is composed of an oil tank body, an oil filling port, an air vent, an oil conveying pipe, a shut-off valve, check valves and an oil tank static pressure transducer. An additional air source is not needed, so that boiling of fuel oil in the oil tank is avoided, air blockage in an oil supply pipeline is avoided, and safe aerial oil supply of the aircraft is achieved with the smallest structural weight. The pressure-maintaining oil tank is simple, easy to operate and high in reliability.

Description

technical field [0001] The invention relates to an aircraft pressure-holding fuel tank, which belongs to the technical field of aviation aircraft. Background technique [0002] Aviation kerosene for aircraft is a hydrocarbon, which is characterized by easy volatility, high saturated vapor pressure and strong hygroscopicity. Aircraft flying at high altitudes also brings some problems to the normal work of the fuel system. Because the air at high altitude is thin and the atmospheric pressure drops sharply, the surface pressure of the fuel in the fuel tank drops below the saturated vapor pressure, and the fuel will boil, causing violent evaporation. The flight altitude of the aircraft exceeds 7620m (25000ft), if the aircraft fuel tank is connected to the atmosphere, aviation kerosene will boil. Especially at the elbow joint of the oil circuit, the local flow velocity of the fuel is relatively large, and the local pressure is reduced. Not only the fuel itself will evaporate, b...

AI Technical Summary

Problems solved by technology

[0004] The normal cruising altitude of some aviation aircraft is below 7620m, and the ceiling of the aircraft exceeds 7620m. The fuel tank can be designed as a ventilated fuel tank during normal flight, and the aircraft occasionally needs to maintain the pressure of the fuel tank when flying at the ceiling altitude for a short time. The traditional pressurized fuel tank design, equipped with independent air sources, air pumps, pipelines and other equipment, makes the structure of the fuel tank complex, heavy in structure, takes up a lot of space on the plane, and also increases the cost of the plane

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