Patent ID: 7182579
Filing Date: 2007-02-27
Classification: F01D,F04D,F05B,F05D

Abstract:
1. A rotor assembly for a turbomachine, comprising: an impeller operable to rotate around an axis and having an opening extending in an axial direction, the impeller also including a stem with an outer surface having a tapered profile in a cross section including the axis and a non-circularly symmetric profile in a cross section perpendicular to the axis, a rotatable shaft including a bore extending in the axial direction, wherein the bore is configured to receive the impeller stem and engage the impeller stem when the shaft is rotating, a bolt inserted in the impeller opening and the bore for connecting the impeller to the shaft, and a compliant spacer between a first surface of the shaft and a first surface of the impeller, wherein the compliant spacer substantially conforms to the first surface of the shaft and to the first surface of the impeller when the bolt is tightened to a predetermined torque value.