Patent ID: 9624940
Date: 2017-04-18
CPC Classifications: F04D,F16C

Claim:
1. A rotor assembly for a centrifugal compressor comprising: a shaft to which are mounted a centrifugal impeller and a bearing assembly comprising: a pair of spaced bearings surrounded by a sleeve, wherein the centrifugal impeller comprises a hub supporting a plurality of blades, a recess is formed in a top end of the hub, a bore extends through the recess formed in the top end of the hub with the shaft being inserted through the bearing assembly and into the bore, the diameter of the recess is greater than that of the bore, the bearing assembly is located at least partly within the recess, wherein the hub is spaced radially from the bearing assembly, and wherein the shaft and the bearing assembly substantially fill the recess formed in the top end of the hub and present an annular gap between an outer diameter of the sleeve and an inner diameter of the recess.