Patent ID: 9644633
Date: 2017-05-09
CPC Classifications: F04D,F16C

Claim:
1. A centrifugal compressor unit comprising: a motor means rotationally driving a rotor; and at least one compressor comprising: a set of active bearings for axially and radially guiding the rotor and the driven shaft; and cooling means for cooling the motor means and the guide bearings by tapping off some of the gas handled by the compressor at an outlet from a first compression stage, passing the gas through the motor means and through the bearings and reinjecting the gas into an inlet side of one of the at least one compressor, wherein the cooling means are equipped with filtering means for filtering the gas handled by the compressor, wherein the cooling means comprises a set of internal passages for feeding the motor means and the bearings with cooling gas which are formed in the compressor unit, and wherein the flow of cooling gas in the motor means is separate from the flow of cooling gas in the bearings, and wherein the flow of cooling gas converges upstream of the first compression stage.