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:
Aug. 19, 2014
Filed:
Oct. 28, 2010
Takahiro Moritsugu, Tokyo, JP;
Satoaki Aoki, Tokyo, JP;
Hidetoshi Fukuta, Tokyo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A double casing type pump and a performance adjusting method allow for adjustment of the performance of the pump, especially the head of the pump, without large-scale work or component disassembly. The pump includes impellers fixed to a rotation shaft, an inner casing shrouding the impellers, an outer casing shrouding the inner casing and having a suction opening and a discharge opening. A space is formed between the inner and outer casings that communicates with the discharge opening. A bypass hole connects the space to the working fluid passage in the inner casing and has a throat diameter adjusting member. A plurality of throat diameter adjusting members are prepared in advance, each member having different throat area. One of the throat diameter adjusting members is selected so that the performance of the pump remains within a predetermined range.