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:
May. 18, 2004
Filed:
Jun. 27, 2002
Applicant:
Inventors:
Kouichi Irie, Tsuchiura, JP;
Tomoyoshi Okamura, Minori, JP;
Yoshio Anzai, Chiyoda, JP;
Junichi Kurokawa, Yokohama, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D 2/940 ;
U.S. Cl.
CPC ...
F04D 2/940 ;
Abstract
In an axial flow hydraulic machine, a plural number of grooves are formed on an inner surface of a casing, directed into a pressure gradient direction, for connecting between an inlet side of an impeller and an inside of blade residing region on the casing inner surface. With movement of movable members provided on the casing inner surface, the grooves appear within the blade residing region in an unstable operation region, while the grooves cause no interference with the blades of the impeller in a stable operation region.