Patent ID: 9151293
Filing Date: 2015-10-06
Classification: F04D

Abstract:
1. A system for injecting and extracting gas for a fluid rotating machine, the system comprising: at least one stator case; at least one first stage which receives the gas flowing into the machine; at least one final stage, downstream of which the gas is discharged from the machine; and one or more intermediate stages arranged between the first stage and the final stage; each stage made up of at least one centrifugal rotor and a fixed ducting, associated with the centrifugal rotor and made on the at least one stator case, wherein the at least one stator case comprises: a first injection and extraction system comprising at least one first worm screw for extracting gas from the machine and at least one second worm screw for injecting gas into the machine; wherein at least one stage has a return channel, wherein said fluid travels radially inward toward a next stage: wherein the first and second worm screws for extracting gas and injecting gas are operatively connected to at least one stage of the machine in such a manner to allow the injection or extraction of the gas through the at least one stage of the machine; wherein the second worm screw for injecting gas is in fluid connection, immediately downstream of a return channel of the ducting using a first connection channel shaped to facilitate the flow of the gas towards the ducting proximate a region where the flow changes from a radial flow to an approximately axial flow to minimize fluid dynamic loss.