Patent ID: 6997686

Claim:
A compressor assembly for compressing gas, comprising: a compressor housing having a gas inlet for receiving gas to be compressed and a gas outlet for the compressed gas; a rotating assembly mounted for rotation about an axis within the compressor housing including: a shaft being supported for rotation within the compressor housing; a thrust bearing disk for maintaining an axial position of the rotating assembly along its axis within the compressor housing; a motor rotor mounted on the shaft; and first and second impellers mounted for rotation with the shaft at opposite ends of the shaft, each impeller having an inlet, a discharge outlet and an integral shroud cover cooperating with impeller blades to define passages for gas passing through the impellers between the inlet and the outlet; a motor stator supported by the compressor housing and cooperating with the motor rotor for driving the rotating assembly; first and second journal bearings mounted in the compressor housing for supporting the shaft for rotation and for maintaining a radial position of the rotating assembly with respect to its axis within the compressor housing; first and second volute housings connected with the compressor housing and respectively associated with the discharge outlets of the first and second impellers for collecting gas discharged thereby and further discharging the gas, each said volute housing defining a logarithmic spiral-shaped volute in which discharged gas is received from the associated impeller; and first and second diffusers associated with the first and second volute housings, respectively, each diffuser having air-foil shaped vanes located in the volute adjacent the discharge outlet of the respective impeller with which the respective volute housing is associated.