Patent ID: 9689401
Date: 2017-06-27
CPC Classifications: F01D,F04D,F05D

Claim:
1. An impeller designed to be mounted on a rotary shaft of a compressor, comprising: a basic rim provided with axial blades protruding on one radial face of the basic rim; an annular hub capable of being coupled to the basic rim and to the rotary shaft; and an annular plate, wherein the annular hub, the annular plate, and the basic rim are configured to interact together so as to hold the basic rim axially and to maintain a freedom of radial deformation of the basic rim relative to the annular hub and to the annular plate, the basic rim being held only by the annular plate and the annular hub, wherein the basic rim comprises a circular key on its inner perimeter capable of interacting with a first notch made in the annular hub and a second notch made in the annular plate, the first and second notches being placed opposite one another so that the circular key of the basic rim is held in the notches when the annular hub, the annular plate and the basic rim are assembled, and wherein the impeller further comprises radial guiding means capable of limiting friction between the basic rim and the annular hub, and between the basic rim and the annular plate during the radial deformation of the basic rim, the radial guiding means comprising, on each face of the basic rim, at least one circular groove placed in the circular key, the circular grooves each comprising an O-ring or a rolling means.