Patent ID: 7713039

Claim:
Screw compressor with a rotor housing ( 1 ) in which two screw rotors ( 3 , 5 ) are rotatably held with parallel axes, said rotors meshing into one another with screw-shaped ribs and grooves and which convey a gaseous medium during operation, from a suction-side end toward a pressurized end of the rotors, thereby compressing it, wherein each of the rotors has a shaft pin ( 7 a , 7 b , 9 a , 9 b ) at its suction-side end and its pressure-side end, respectively, said pins being held in the rotor housing ( 1 ) by bearings ( 13 , 15 ) and being sealed by respective sealing arrangements, wherein the sealing arrangement ( 11 , 11 ′) of each pressure-side shaft pin has an annular relief chamber ( 51 ) to which a vent channel ( 53 ) is connected, characterized in that the vent channel ( 53 ) connects the relief chamber ( 51 ) to a chamber ( 10 ) within the screw compressor in which a pressure exists during operation of the screw compressor that is higher than atmospheric pressure but lower than the outlet pressure of the screw compressor, wherein the vent channel ( 53 ) is incorporated into a wall of the rotor housing ( 1 ) that is cooled with a coolant.