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:
Sep. 18, 2012
Filed:
Jul. 29, 2009
Hideo Nishida, Tokyo, JP;
Hiromi Kobayashi, Tokyo, JP;
Masanori Tanaka, Tokyo, JP;
Tetsuya Kuwano, Tokyo, JP;
Toshio Itou, Tokyo, JP;
Takanori Shibata, Hitachinaka, JP;
Manabu Yagi, Tsuchiura, JP;
Hideo Nishida, Tokyo, JP;
Hiromi Kobayashi, Tokyo, JP;
Masanori Tanaka, Tokyo, JP;
Tetsuya Kuwano, Tokyo, JP;
Toshio Itou, Tokyo, JP;
Takanori Shibata, Hitachinaka, JP;
Manabu Yagi, Tsuchiura, JP;
Hitachi Plant Technologies, Ltd., Tokyo, JP;
Abstract
In a multistage centrifugal compressor, a plurality of impellers is attached to the same rotary shaft. Vaned Diffusers and vaneless diffusers are used, as diffusers, for respective compressor stages configuring the compressor. The vaned diffusers are continuously used from the first compressor stage to the middle compressor stage, and the vaneless diffusers are used for the last compressor stage and the previous stage. While high efficiency is maintained at the compressor stages having the vaned diffusers, an operating flow range is secured at the compressor stages having the vaneless diffusers.