Sliding type air inlet ventilation mechanism of airplane auxiliary power unit

Abstract

The invention discloses a sliding type air inlet ventilation mechanism of an airplane auxiliary power unit. Selection and arrangement of an air inlet valve actuator are freer, and air inlet cannot be affected. The sliding type air inlet ventilation mechanism comprises an air inlet valve, a driving mechanism, two sets of transmission mechanisms, an air inlet valve rotating shaft, a driving shaft and two sets of movement limiting mechanisms, the curved surface shape of the air inlet valve is matched with an aircraft fuselage skin, and the air inlet valve is opened or closed through the driving mechanism; the transmission mechanisms are arranged on the two sides of the intake valve in the length direction, the two ends of the transmission mechanisms are connected with the intake valve and the driving mechanism, the end, close to the intake valve, of each transmission mechanism is connected with the intake valve through the corresponding intake valve rotating shaft, and the end, close to the driving mechanism, of each transmission mechanism is connected with the driving mechanism through the corresponding driving shaft. Each movement limiting mechanism is provided on one side and the other side in the longitudinal direction of the intake valve, respectively, on the outer side in the longitudinal direction of the intake valve with respect to the intake valve.

Description

technical field [0001] The invention relates to air intake and ventilation cooling of an aircraft auxiliary power unit, and more particularly relates to a sliding intake ventilation mechanism of an aircraft auxiliary power unit. Background technique [0002] The aircraft auxiliary power unit is mainly used to start the main engine and supply air to the cabin, and provide auxiliary power for various airborne equipment. Usually when the main engine is not working when the aircraft is on the ground, the main air source and power supply come from the auxiliary power unit of the aircraft. The aircraft auxiliary power unit needs to inhale airflow from the outside of the fuselage through the air intake system and ventilation cooling system. The air intake system airflow is used for the operation of the aircraft auxiliary power unit itself, and the ventilation cooling airflow is used for the lubricating oil radiator of the aircraft auxiliary power unit. , aircraft auxiliary power u...

AI Technical Summary

Problems solved by technology

In addition, in the design of some large-scale civil aircraft, the power of the auxiliary power unit of the aircraft is large, the air intake volume is large, and the area of ​​the intake valve is also large. At this time, the intake valve actuator 13 must also be selected correspondingly larger. specifications, which caused certain difficulties to its layout and structural installation;

[0007] (2) The push rod 13a of the intake valve actuator 13 is located in the path of the intake air flow, which will cause unnecessary disturbance to the intake air

Especially when the intake valve 11 is opened, the push rod 13a passes through the middle part of the intake duct 14, which has a certain influence on the intake air.

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