DEVICE AND METHOD FOR DETACHABLY CONNECTING AN IMPELLER TO A SHAFT

摘要

A rotor assembly (10) for a turbomachine includes an impeller (30), a shaft (20), a bolt (40), and a compliant spacer (60). The impeller (30) has an opening (36) extending in an axial direction and a stem (34) with an outer surface having a tapered profile in a cross section including the axis (14) and a non-circularly symmetric profile in a cross section perpendicular to the axis (14). The shaft includes a bore (22) that is configured to receive and engage the impeller stem (34). The bolt (40) connects the impeller (30) to the shaft (20), and the compliant spacer (60) is located between a first sur&ce (18) ofthe shaft (20) and a first surface (39) of the impeller (30), wherein the compliant spacer (60) substantially conforms to the first surface (18) ofthe shaft (20) and to the first surface (39) ofthe impeller (30) when the bolt (40) is tightened to a predetermined torque value.