Patent ID: 9581046
Date: 2017-02-28
CPC Classifications: F01D,F04D,F05D

Claim:
1. A scroll structure of a centrifugal compressor comprising: a flow path of a fluid represented by gas or air discharged from a diffuser portion disposed on a downstream side of a compressor impeller of a centrifugal compressor, a scroll having a plurality of cross sections arranged in a circumferential direction to a rotational axis center of the compressor; a first portion and a second portion of the scroll; wherein the first portion of the scroll extends from a start winding of the scroll up to a circumferential angle of the scroll that is less than a scroll end point; the first portion of the scroll being comprised of a first set of the plurality of cross sections of the scroll; wherein in the first portion of the scroll each successive cross section of the first set of the plurality of cross sections as viewed in a direction of the start winding of the scroll to the circumferential angle has a larger radius than the preceding cross section; wherein the second portion of the scroll extends continuously from the circumferential angle of the first portion of the scroll to the end point of the scroll; the second portion of the scroll being comprised of a second set of the plurality of cross sections of the scroll; wherein in the second portion of the scroll each successive cross section of the second set of the plurality of cross sections as viewed in the direction of the circumferential angle to the end point of the scroll has a smaller radius than the preceding cross section.