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:
Oct. 16, 2012
Filed:
May. 08, 2008
Hideo Nishida, Tokyo, JP;
Hiromi Kobayashi, Tokyo, JP;
Masanori Tanaka, Tokyo, JP;
Tadaharu Kishibe, Tokyo, JP;
Manabu Yagi, Tokyo, JP;
Tetsuya Kuwano, Tokyo, JP;
Hideo Nishida, Tokyo, JP;
Hiromi Kobayashi, Tokyo, JP;
Masanori Tanaka, Tokyo, JP;
Tadaharu Kishibe, Tokyo, JP;
Manabu Yagi, Tokyo, JP;
Tetsuya Kuwano, Tokyo, JP;
Hitachi Plant Technologies, Ltd., Tokyo, JP;
Abstract
A multistage centrifugal compressor includes a rotary shaft, and multistage impellers attached to the rotary shaft. Each of the impellers includes a hub, a shroud and blades therebetween in a radial cascade arrangement. An annular suction passage for guiding the fluid flow from the inward radial direction to a blade inlet is disposed upstream of the centrifugal impeller. A diffuser is disposed downstream of the centrifugal impeller. A bend portion is disposed downstream of the diffuser, and a return channel with a guide blade portion is disposed downstream of the bend portion. The annular suction passage at a hub side includes an axial parallel portion.