GAS-TURBINE ENGINE FUEL SUPPLY AND CONTROL SYSTEM Russian patent published in 2004 - IPC

FIELD: mechanical engineering; gas-turbine engines. SUBSTANCE: system is designed for supply of fuel and automatic control of gas-turbine engines. Proposed system contains housing accommodating positive-displacement pump with fuel inlet and outlet channels, maximum pressure valve, meter with fuel inlet and outlet main lines, constant pressure differential control including spring-loaded sensitive and actuating elements. Actuating element connecting fuel inlet and outlet channels is made in form of servomotor whose control space is coupled with inlet channel through cutoff edge of sensitive element. Multistage centrifugal pump with cutoff valve built-in at inlet is connected in parallel with pump. Outlet of pumps are combined into common main line through check or cutoff valves. Spring-loaded throttling spool is installed in common main line. Spring space of spool is connected with outlet main line, and space formed by its opposite end face and housing is connected with inlet main line. Spring space of sensitive element is connected with inlet main line, and space between opposite end face of sensitive element and housing of meter is connected with common main line after pumps. So, positive-displacement pump provides starting, low-power takeoff and gradual climbing, and at cruising flight conditions centrifugal pumps is gradually cut in and positive-displacement pump is cut out. EFFECT: improved reliability in operation. 3 cl, 1 dwg