Active-passive switching oil supply system for aircraft

Abstract

The invention provides an active-passive switching oil supply system for an aircraft. The active-passive switching oil supply system comprises a front oil tank, a rear oil tank, an overload tank, an oil level annunciator, a deflation electromagnetic valve, an oil supply switching electromagnetic valve, oil passing pipelines and a deflation pipeline. The front oil tank and the rear oil tank are connected with two oil way inlets of the oil supply switching electromagnetic valve through the oil passing pipelines respectively, and the oil way outlet of the oil supply switching electromagnetic valve is connected with the overload tank. An upper oil way inlet and a lower oil way inlet of the oil level annunciator are respectively communicated with the upper end and the middle end of the overloadtank through the oil passing pipelines. The deflation electromagnetic valve is connected with the oil level annunciator; and the deflation pipeline is connected with the deflation electromagnetic valve. The problem that the aircraft still needs to continuously supply oil to the engine in tail stage of the long-time diving gliding process with the large attack angle is solved, the requirement thatthe oil supply sequence of the oil tanks needs to be switched in real time in the flight process of the aircraft to guarantee gravity center change is met, and 100% success of a flight test is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of aircraft fuel systems, and in particular relates to an active and passive switching fuel supply system for aircraft. Background technique [0002] With the continuous improvement of the performance and combat requirements of the new generation of weapon systems, compared with the traditional model, in addition to the conventional fuel system function, its fuel system also needs to have two functions: one is to dive for a long time at the end of the large angle of attack During the descent, it is still necessary to maintain a continuous fuel supply to the engine; the second is to switch the order of the fuel supply tanks in real time as needed during the whole flight, so as to ensure that the change of the center of gravity meets the use requirements. [0003] The aircraft generally maintains an elevation angle when flying, so the oil intake port of the fuel tank is generally arranged at the rear and lower...

AI Technical Summary

Problems solved by technology

[0003] The aircraft generally maintains an elevation angle when flying, so the oil intake port of the fuel tank is generally arranged at the rear and lower to pursue the least possible remaining fuel weight. However, when the terminal dives at a high angle of attack for a long time In this case, the fuel will accumulate at the front of the fuel tank, making it impossible to get fuel from the fuel intake port. Therefore, a special design is required to solve the problem of continuous fuel intake when the terminal dives at a high angle of attack for a long time.

[0004] In order to effectively control the change of the center of gravity and increase the fuel loading weight, modern aircraft often adopt the design of multiple fuel tanks. In the prior art, the fuel system generally adopts the method of sequential fuel supply from multiple fuel tanks. The fuel tank design has been determined according to the requirements of the center of gravity change. Well, the fuel supply sequence of multiple fuel tanks, this method is simple and reliable in principle, but it cannot realize the function of switching the fuel supply tank sequence in real time according to the needs of use

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