Patent ID: 6701715
Filing Date: 2004-03-09
Classification: F02C

Abstract:
A system for bleeding air from a compressor in an engine comprising:a primary inlet; a secondary inlet; a variable geometry ejector for introducing air from said primary inlet; a mixing section for mixing said introduced air from said primary inlet with air from said secondary inlet; a diffuser downstream from said mixing section with an upstream end and a downstream end; a tube comprised of a diffuser feedback port and an actuator port, wherein said diffuser feedback port is in communication with said downstream end of said diffuser and said actuator port is in communication with an ejector needle valve actuator; said ejector needle valve actuator is comprised of a needle connected to a piston, and at least one spring for providing biasing force against said piston, said at least one spring located in an ambient air pressure equalized compartment, having a vent to ambient air pressure, said ambient air pressure separate and distinct from air flow related to said primary and secondary inlets; said variable geometry ejector receives said needle extending into a nozzle area, wherein high pressure air from said primary inlet is contained therein, said needle is actuated by said piston and sets the nozzle area to control the high pressure flow rate into said mixing section, wherein low pressure air from said secondary inlet is drawn and allowed to mix in said mixing section with said high pressure nozzle flow forming an ejector exit mixed flow; and said ejector exit mixed flow is drawn from said upstream end of said diffuser to said downstream end of said diffuser and allowed to flow to an opening and said diffuser feedback port, wherein air drawn to said diffuser feedback port is drawn to said actuator port and introduced to said ejector needle valve actuator as pressure to actuate said piston against said biasing force of said at least one spring in said ambient air pressure equalized compartment.