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:
Nov. 23, 2004
Filed:
Mar. 25, 2003
Applicant:
Inventors:
Katsumasa Shimmei, Tokyo, JP;
Kazuo Niikura, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P 1/500 ;
U.S. Cl.
CPC ...
B23P 1/500 ;
Abstract
An existing water-lifting pump is converted into a reversible pump-turbine which functions as not only a water-lifting pump, but also a pump-turbine capable of generating electric power. An existing pump runner is modified or replaced with a replacement runner. Movable guide vanes are disposed, or the rotational speed of the runner is increased. Alternatively, water passages in the stationary parts are modified. A pumping station can be given with the function as an urgent power plant in the event of an electric power shortage. A converted pump-turbine having good pump-turbine characteristics can be economically obtained.