Patent ID: 6499955
Filing Date: 2002-12-31
Classification: F04D,F05D

Abstract:
A two-stage centrifugal compressor comprising:a motor; a drive shaft which rotates via an output of said motor; a first impeller attached to said drive shaft, said first impeller receiving fluid from a first entry, pressurizing the fluid and sending the fluid to a first exit; and a second impeller, spaced from said first impeller and attached to said drive shaft, said second impeller receiving fluid from a second entry, pressurizing the fluid and sending the fluid to a second exit, wherein said second impeller includes: a hub coupled to said drive shaft; a plurality of blades provided on a first face of said hub; and a plurality of pressure attenuating grooves provided at an outer peripheral edge of said hub and adapted to reduce an axial load applied to said second impeller.