AIR TRANSFER CONTROLLER FOR AUXILIARY POWER PLANT COMPRESSOR Russian patent published in 1997 - IPC

FIELD: automatic-control systems of gas-turbine engines. SUBSTANCE: controller has channels 2 and 3 for supplying air at pressure P_c from inlet and at pressure P_y from narrow part of Venturi tube shaped nonlinear throttle 7 whose inlet is connected to interlock setting element 4 of air transfer valve 8 and outlet to low-pressure source. Narrow section of throttle 7 is connected to control channel of first fluid element of air transfer valve control unit; other control channel is connected to low-pressure source, supply nozzle, to channel 3; one of outlet channels of first fluid element, to low-pressure source, other outlet channel, to control channel 13 of second fluid element 14. Control channel 15 of second fluid element 14 is connected to pressure ratio setting element 16. Outlet channels 21 and 22 of second fluid element are connected to control channels of fluid amplifier 23 communicating through channels 24 and 25 with spaces 26 and 27 of pneumatic actuator 28 of air transfer valve 29. EFFECT: improved design. 2 dwg