Patent ID: 6506027
Filing Date: 2003-01-14
Classification: F04C

Abstract:
A helical screw compressor having a first compressor stage and a second compressor stage, and in which liquid is injected in both the first compressor stage and the second compressor stage, said helical screw compressor comprising:a male rotor and a female rotor in each of the first and second compressor stages; a connecting duct which extends between an outlet of the first compressor stage and an inlet of the second compressor stage and through which gas that has been compressed in the first compressor stage is delivered to the second compressor stage; and a pump which transports liquid precipitate present in the connecting duct through a heat exchanger and which delivers the liquid cooled in the heat exchanger to both the first and second compressor stages; wherein the pump is driven by one of the rotors in the first compressor stage.