The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 2016
Filed:
Feb. 03, 2011
Xinqian Zheng, Beijing, CN;
Yun Lin, Beijing, CN;
Yangjun Zhang, Beijing, CN;
Mingyang Yang, Beijing, CN;
Takahiro Bamba, Tokyo, JP;
Hideaki Tamaki, Tokyo, JP;
Xinqian Zheng, Beijing, CN;
Yun Lin, Beijing, CN;
Yangjun Zhang, Beijing, CN;
Mingyang Yang, Beijing, CN;
Takahiro Bamba, Tokyo, JP;
Hideaki Tamaki, Tokyo, JP;
TSINGHUA UNIVERSITY, Beijing, CN;
IHI CORPORATION, Tokyo, JP;
Abstract
A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. An axial-direction position Sfrom an upstream end face of the suction ring groove to an impeller full blade leading edgeor a width bof the suction ring grooveis represented as A(α·D−β·D)+Aand is distributed in a parabolic shape in a circumferential direction. An initial phase angle θis in a range of 0≦θ≦2π. A circumferential angle α of the casing has a definition range of θ≦α≦θπ. In the expression, A denotes a parameter of the parabola in the axial-direction position Sor the width b, and Adenotes an extreme of the axial-direction position Sor the width bwhen corresponding circumferential angle β and the α are equal at an extreme point of distribution of the parabola.