Patent ID: 9234526
Filing Date: 2016-01-12
CPC Classification: F04D

Claim Text:
1. A centrifugal compressor comprising: an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channel and a back-flow ring groove to form a self-recirculating channel, wherein an axial distance S wherein an initial phase angle θ wherein a circumferential angle α of the casing has a definition range of θ wherein A denotes a parameter of the parabola in the axial distance S wherein A wherein β is a value of the circumferential angle α when A(α·D−β·D) wherein D denotes an impeller diameter, wherein as a position of the suction ring groove is shifted in the circumferential direction, the axial distance S wherein the first circumferential range and the second circumferential range each continuously extend in the circumferential direction, and wherein the first circumferential range and the second circumferential range thereby form one complete circle.