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:
Dec. 12, 2000
Filed:
Mar. 26, 1999
Applicant:
Inventors:
Noriyuki Nabeshima, Oizumi-machi, JP;
Tomohito Takada, Osaka, JP;
Michihiro Kurokawa, Hirakata, JP;
Tomohito Koizumi, Ota, JP;
Yoshinori Toya, Oizumi-machi, JP;
Kiyoshi Koyama, Isesaki, JP;
Shigeya Ishigaki, Ora-machi, JP;
Assignee:
Sanyo Electric Co., Ltd., Moriguchi, JP;
Primary Examiner:
Int. Cl.
CPC ...
F04D / ;
U.S. Cl.
CPC ...
415 531 ; 415119 ; 416178 ; 416187 ; 416203 ;
Abstract
A number of vanes 12 are disposed in a peripheral direction of a plurality of supporting disks disposed along a rotary shaft 14 at given intervals. Each vane 12 is disposed at an angular interval as determined by a logistic representation. Thereby the intensity and variations of noise levels at around 8N on the low-frequency side, as well as the noise level caused by rotary first-order sounds, can be reduced.