Patent ID: 9062549
Filing Date: 2015-06-23
Classification: F01C,F04C

Abstract:
1. A fluid-injected screw-type compressor element comprising: two co-operating rotors wherein at least a first rotor of the two co-operating rotors is radially and axially bearing-mounted in a housing; said housing defining a rotor chamber having chamber walls in which the two co-operating rotors are located and in which a fluid circuit for the circulation of a fluid is provided; and means for restricting friction between at least one of the two co-operating rotors and the chamber walls, wherein at least a second rotor of the at least two co-operating rotors is configured to be radially aligned by at least one of the contact of the second rotor with a part of the wall of the chamber opposite a radial perimeter of the second rotor and a co-operation with the first rotor, wherein said means for restricting friction comprises a hard frictionless coating or a relief that provides a morphology with frictionless behavior, said coating or relief being provided over at least an end face of the second rotor so that said second rotor is free of axial bearings, and wherein at least one rotor on at least one or on both axial rotor ends is free of a bearing-mounted axle journal.