Patent ID: 6821098
Filing Date: 2004-11-23
Classification: F04C

Abstract:
A compressor comprising:a housing assembly; a male rotor having a screw-type male body portion, the male rotor extending from a first end to a second end and held within the housing assembly for rotation about a first rotor axis; and a female rotor having a screw-type female body portion enmeshed with the male body portion, the female rotor extending from a first end to a second end and held within the housing assembly for rotation about a second rotor axis, wherein: the housing has first and second portions respectively cooperating with the male and female rotors to respectively define inlet ports to respective male and female compression pockets; the housing has third and fourth portions respectively cooperating with the male and female rotors to respectively define outlet ports from said respective male and female compression pockets; the first, second, third, and fourth housing portions are positioned so that with the male rotor revolving at a given speed, the male and female compression pockets are closed for unequal male and female durations; the male compression pocket outlet port is open before the female compression pocket outlet port; and the female compression pocket inlet port is closed before the male compression pocket inlet port.