SYSTEM FOR CONTROLLING A FEATHER-REVERSIBLE PROPELLER FOR LOCAL AIRLINE AIRCRAFT

摘要

The invention relates to aviation technology, specifically hydromechanical systems with a single control channel for a feather-reversible propeller for local airline aircraft. The propeller control system contains a hydraulic mechanism located in the propeller hub (1) and used for altering the position of the blades (3), with a piston (7), feathering spring (14) and propeller control slide valve (23) whose bores (24, 25, 26) are connected to the coarse pitch chambers (12), fine pitch chambers (13) and discharge channel (27), and also contains a propeller regulator (4) with a centrifugal mechanism slide valve (18) and slide valve for removing the blades from the intermediate angle support (20), and an oil pump (15) with reduction valve (16). The intermediate angle support is incorporated in the propeller control system in the form of a plunger (32) with spring (33) and situated in front of the piston (7). The propeller control slide valve (23) is secured in the piston (7) so as to be capable of limited axial movement and co-operation with the plunger (32) when the blades are on the intermediate angle support. The face of the propeller control slide valve on the side opposite to the support has a chamber (29) to which is applied the adjustable pressure of working fluid from the centrifugal mechanism control valve. Above the centrifugal mechanism slide valve is situated the readjustment piston (38) with rod (39) which at the command of the slide valve for removing the blades from the intermediate angle support (20) disconnect the centrifugal mechanism slide valve and allow working fluid to be fed into the chamber (29) directly from the reduction valve (16). To control the angle of pitch of the blades in reverse mode, it is necessary to increase the tension of the reduction valve spring from the engine control lever to generate forces acting on the propeller control slide valve capable of overcoming the force of the spring (33) of the plunger (32).