초록 ▼

The position of a slide valve in a screw compressor in a refrigeration system is controlled using a gaseous medium sourced from two or more sources of such fluid, both of which are in open flow communication with the slide valve actuating piston when the slide valve load solenoid is open. Preferred

The position of a slide valve in a screw compressor in a refrigeration system is controlled using a gaseous medium sourced from two or more sources of such fluid, both of which are in open flow communication with the slide valve actuating piston when the slide valve load solenoid is open. Preferred gas sources are a closed compression pocket in the working chamber of the compressor and the discharge passage downstream of the compressor's working chamber. Gas at sufficiently high pressure is available whenever the compressor is operating to ensure that the compressor will load under all conditions within the compressor's operating envelope.

대표청구항 ▼

[ What is claimed is:] [1.] A refrigeration screw compressor, having a suction and a discharge port, comprising:a housing, said housing defining a working chamber in flow communication with said suction and said discharge ports of said compressors;a male rotor disposed in said working chamber;a fema

[ What is claimed is:] [1.] A refrigeration screw compressor, having a suction and a discharge port, comprising:a housing, said housing defining a working chamber in flow communication with said suction and said discharge ports of said compressors;a male rotor disposed in said working chamber;a female rotor disposed in said working chamber in meshing engagement with said male rotor, rotation of said male and said female rotors operating to compress a gaseous working fluid within said working chamber from a suction to a discharge pressure;a slide valve, said slide valve having an actuating piston;a first source of gas for loading said compressor;a second source of gas for loading said compressor; andvalve means interposed between said piston and said first and said second gas sources, both of said first and said second gas sources being placed in flow communication with said piston, when said valve means is open, so as to load said compressor.