Patent ID: 7575422
Filing Date: 2009-08-18
Classification: F04D,F05D,H02K

Abstract:
1. A compressor unit, comprising: a multistage centrifugal compressor for compressing a gas an electric motor having a stator and a rotor for driving the multistage centrifugal compressor, the rotor being supported by a first and second magnetic radial bearings each magnetic radial bearing being arranged at opposite ends of the rotor and a magnetic thrust bearing arranged adjacent to one of the first or second magnetic radial bearings, the multistage centrifugal compressor and the electric motor being accommodated in a common gastight housing which is provided with a gas inlet and a gas outlet, the stator being accommodated and isolated from the multistage centrifugal compressor in a separate stator space, which is delimited by a toroidally shaped wall section, radially and axially surrounding the stator, of the common gastight housing of the compressor unit, a gastight partition which extends between the stator and the rotor of the electric motor, and a first end wall which extends between the gastight partition and the common gastight housing of the compressor unit and a second end wall arranged opposite the first end wall and configured to isolate the stator from the compressor in cooperation with the gastight partition and the first end wall, wherein the gastight partition extends freely between the stator and the rotor of the electric motor and comprises a material of sufficiently high strength for it to remain clear of the stator and the rotor under working pressures of the gas which may occur inside the common gastight housing, wherein the high-strength material of the gastight partition comprises a fibre-reinforced plastic.