초록 ▼

A bleed valve for a compressor wherein compressor discharge pressure is proportional to compressor rotor speed, the bleed valve including a bleed control poppet valve, a pair of differential pressure diaphragms, a pressure regulator valve, and an accumulator. The bleed valve automatically effects bl

A bleed valve for a compressor wherein compressor discharge pressure is proportional to compressor rotor speed, the bleed valve including a bleed control poppet valve, a pair of differential pressure diaphragms, a pressure regulator valve, and an accumulator. The bleed valve automatically effects bleed air flow in proportion to the rate of acceleration of the compressor rotor when the rate of compressor rotor acceleration exceeds a scheduled maximum rate and for a predetermined duration after the onset of compressor rotor deceleration at a rate above a minimum scheduled rate.

대표청구항 ▼

In combination with a compressor supplying compressed air at a compressor discharge pressure proportional to the speed of a rotor of said compressor, a bleed valve comprising, a valve body defining a bleed passage operative to bleed air compressed by said compressor to a lower pressure, a valve on s

In combination with a compressor supplying compressed air at a compressor discharge pressure proportional to the speed of a rotor of said compressor, a bleed valve comprising, a valve body defining a bleed passage operative to bleed air compressed by said compressor to a lower pressure, a valve on said body movable between a closed position blocking said bleed passage and a plurality of open positions defining corresponding bleed flow rate through said bleed passage, spring means exerting a spring force on said valve biasing said valve to said closed position, means on said body defining a first chamber and a second chamber each supplied with air at said compressor discharge pressure, acceleration regulator valve means connected to said first chamber and to said compressor operative to regulate an acceleration servo pressure in said first chamber inversely proportional to the rate of acceleration of said rotor whenever said acceleration rate exceeds a predetermined maximum rate, actuating means connected to said valve and to said first and said second chambers operative to exert on said valve against said spring force a net pressure force exceeding said spring force and proportional to the difference between said acceleration servo pressure and said compressor discharge pressure whereby said valve is moved to one of said open positions defining a bleed flow rate proportional to the amount by which said rotor acceleration rate exceeds said predetermined maximum rate, and deceleration regulator valve means connected to said first chamber and to said compressor operative in response to deceleration of said rotor at rates above a predetermined minimum rate to exhaust said first chamber and establish therein for a predetermined duration after the onset of said rotor deceleration a deceleration servo pressure below said compressor discharge pressure, said actuating means exerting on said valve against said spring force a net pressure force exceeding said spring force proportional to the difference between said deceleration servo pressure and said compressor discharge pressure whereby said valve is moved to said open position for said predetermined duration.