Rotating machine and method of assembly thereof

摘要

A rotating machine and a method of assembly thereof is provided. The machine is a multi-stage rotating machine, such as a compressor, having a common shaft. The proposed method involves consecutively assembling the multiple stages. For each consecutive stage, the proposed method comprises mounting an impeller around a shaft along a tapered surface of contact on said shaft. Subsequently, the method includes applying a radially acting hydraulic pressure on said impeller to radially expand said impeller about an axis of said shaft. An axially acting hydraulic pressure is applied on said impeller to move said impeller relatively longitudinally along said tapered surface on the shaft. Subsequently, the method includes relieving said hydraulic pressures to cause said impeller to shrink radially and securely fit on to said shaft.

主权项

1. A method for assembling a multi-stage rotating machine having a common shaft, comprising:
assembling each of the multiple stages one after the other on the shaft, wherein the assembly of each stage comprises:
mounting an impeller around the shaft along a tapered surface of contact on the shaft,applying a radially acting hydraulic pressure on the impeller to radially expand the impeller about an axis of the shaft,applying an axially acting hydraulic pressure on the impeller to move the impeller relatively longitudinally along the tapered surface on the shaft, andrelieving the hydraulic pressures to cause the impeller to shrink radially and securely fit on to the shaft,wherein, for a respective stage, applying the radially acting hydraulic pressure comprises axially inserting a respective plug within a central axial hole in the shaft and conducting pressurized hydraulic fluid through a fluid conducting port inside the plug, said respective plug being adapted in relation to an impeller mounting location for the respective stage such that the fluid conducting port of the respective plug leads the pressurized hydraulic fluid to a plurality of radially outward extending holes that connect the central axial hole to the mounting location of the impeller for the respective stage.