Patent ID: 7618248

Claim:
Oil-flooded screw compressor for high input power featuring two rotors, a male rotor ( 2 ) having essentially convex lobe flanks featuring four, five or six lobes, and a female rotor ( 3 ) having essentially concave lobe flanks featuring six or seven lobes, with the male rotor having a drive-shaft end ( 5 ), and both rotors are enclosed in housing sections: a suction-housing section ( 12 ) having at least parts of a suction channel ( 4 ) for passing of the working fluid into interlobe spaces of the rotor pair, a rotor-housing section ( 13 ) at least partially enclosing a profile section of the rotors ( 2 ) and ( 3 ), and a discharge-housing section ( 14 ) having at least an outlet port for passing gas out of the interlobe spaces of the rotor pair due to rotation of the rotors ( 2 ) and ( 3 ), and a discharge channel, wherein a ratio L/A between a length L of the profile section of the rotors and distance A between the rotor axes, which determines the bearing load, is decreased by shortening the profile sections of both rotors, and adjacent to the suction side of the profile section of the rotors an intermediate plate ( 7 ) is fixed relative to the rotor-housing section ( 13 ) containing parts of the suction channel ( 4 ) with inlet port ( 6 ), sealing the end face of the profile section of the rotors contactless, and filling appropriately a space formed by shortening of the profile sections of the rotors.