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. 18, 2006
Filed:
May. 07, 2004
Applicants:
Taku Iwase, Tsuchiura, JP;
Kazuyuki Sugimura, Chiyoda, JP;
Taro Tanno, Kiryu, JP;
Inventors:
Assignees:
Hitachi, Ltd., Tokyo, JP;
Japan Servo Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F04D 29/38 (2006.01);
U.S. Cl.
CPC ...
Abstract
An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.