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. 01, 2003
Filed:
Mar. 20, 2001
Kouichi Irie, Tsuchiura, JP;
Tomoyoshi Okamura, Minori, JP;
Sumio Sudo, Chiyoda, JP;
Junichi Kurokawa, Yokohama-shi, Kanagawa-ken 235-0023, JP;
Other;
Abstract
A turbo-type machine, comprising a casing storing an impeller within an inside thereof, and a plural number of grooves formed on an inner surface of the casing in a direction of pressure gradient of fluid, wherein the grooves are provided from 80 to 150 pieces around a periphery on the inner surface of the casing, and a total width of the grooves all around the inner surface of the casing is from 30% to 50% of a peripheral length on the inner surface of the casing. Also, the area on cross-section of the groove within an area where the blades exist is made larger than that of the groove outside where the blades exist, or openings are drilled on a bottom surface of the grooves, each penetrating through thickness of the casing, or the groove is made in a two-layer structure in the direction of pressure gradient of fluid. Or, a round portion is formed at a tip of the blade , or a fin , thereby suppressing the cavitations to generate, as well as obtaining stabilization of the characteristic curve thereof.