Patent ID: 6220816
Filing Date: 2001-04-24
Classification: F04D,F05D

Abstract:
A device for transferring fluid between two successive stages of a multistage centrifugal turbomachine, the device comprising a stator assembly incorporating a plurality of return channels which pick up the high speed fluid flow leaving a centrifugal impeller of one stage of the turbomachine for the purpose of rectifying, slowing down, and conveying said flow to the inlet of another centrifugal impeller of an adjacent stage of the turbomachine,wherein each of the return channels is constituted by a continuous shaped individual tubular element, wherein a first continuous return channel is defined by a set of varying sections defined by parameters and normal to a mean line situated in a predefined plane (P.sub.1 P.sub.2 P.sub.3) containing the axis of the turbomachine, the mean line having a rectilinear first portion, a curved second portion in the form of a circular arc of radius RCO2, and a rectilinear third portion, and wherein the various return channels are identical and derived from one another by rotation about the axis of the turbomachine.