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:
Apr. 03, 2007
Filed:
Aug. 06, 2004
Yoshimasa Chiba, Tsukuba, JP;
Choichi Ishikawa, Tsuchiura, JP;
Hiroyuki Katsura, Tsuchiura, JP;
Daimon Abe, Ishioka, JP;
Yoshimasa Chiba, Tsukuba, JP;
Choichi Ishikawa, Tsuchiura, JP;
Hiroyuki Katsura, Tsuchiura, JP;
Daimon Abe, Ishioka, JP;
Hitachi Industries Co., Ltd., Tokyo, JP;
Abstract
A single-shaft multistage pump is provided to make small-sized and space-saved possible. The single-shaft multistage pump includes a rotary shaft on which impellers are disposed at multiple stages, bearings and for supporting the rotary shaft, and a balance device adapted to apply, to the rotary shaft, a balance thrust force opposing an impeller thrust force. A water-lubricated bearing is used as each of the radial bearings, and the rotary shaft is supported by the water-lubricated bearings with a balance member of the balance device interposed therebetween.