초록 ▼

A bleed valve is in fluid communication with the compressor fluid flow path and the bypass fluid flow path whereby a piston extends radially of the valve and includes a piston head radially remote from the compressor fluid flow path. A pneumatic chamber surrounds a portion of the piston head, and ai

A bleed valve is in fluid communication with the compressor fluid flow path and the bypass fluid flow path whereby a piston extends radially of the valve and includes a piston head radially remote from the compressor fluid flow path. A pneumatic chamber surrounds a portion of the piston head, and air from a source downstream of the impeller is introduced into the chamber. The piston including a valving member and a rigid sleeve connecting the piston head to the valving means opens or closes the communication between the compressor flow path and the bypass flow path. A precompressed spring is associated with the piston to normally urge the piston radially outwardly relative to the compressor fluid flow path to a valve open position, and when the pneumatic pressure in the chamber surrounding the piston head overcomes the precompressed spring, the valve is closed.

대표청구항 ▼

[ I claim:] [1.] In a gas turbine engine including a compressor with an axial fluid flow path, a bypass fluid flow path concentric with the compressor fluid flow path, a bleed valve in fluid communication with the compressor fluid flow path and the bypass fluid flow path whereby the bleed valve comp

[ I claim:] [1.] In a gas turbine engine including a compressor with an axial fluid flow path, a bypass fluid flow path concentric with the compressor fluid flow path, a bleed valve in fluid communication with the compressor fluid flow path and the bypass fluid flow path whereby the bleed valve comprises a piston extending radially, with a piston head radially remote from the compressor fluid flow path, a pneumatic chamber surrounding a portion of the piston head and means for introducing compressed fluid into said chamber, the piston including a valving means and a rigid member extending between the piston head and the valving means whereby the piston is effective to open or close the communication between the compressor fluid flow path and the bypass fluid flow path, the improvement including a precompressed spring, precompressed to between 20 and 50 lbs., associated with the piston to normally urge the piston radially outwardly relative to the compressor fluid flow whereby the pneumatic pressure in the chamber surrounding the piston head must overcome the precompressed spring in order to close said valving means whereby the precompressed spring controls the closing schedule of the bleed valve to avoid the surge conditions of the engine.