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. 30, 2008
Filed:
Apr. 20, 2005
Masanori Watanabe, Chiyoda, JP;
Taku Iwase, Tsuchiura, JP;
Shouichi Kawamata, Hitachi, JP;
Osamu Sekiguchi, Tokyo, JP;
Taro Tanno, Tokyo, JP;
Masanori Watanabe, Chiyoda, JP;
Taku Iwase, Tsuchiura, JP;
Shouichi Kawamata, Hitachi, JP;
Osamu Sekiguchi, Tokyo, JP;
Taro Tanno, Tokyo, JP;
Japan Servo Co., Ltd., Tokyo, JP;
Abstract
In an axial flow fan, for reducing fluid noise and further reducing the noise by suppressing solid-conveyed noise (structure-borne noise) generated by the vibration of an electric motor or the like, the axial flow fan is equipped with a propeller, a motor for driving the propeller, and a venturi portion disposed on the outer circumference side of the propeller and provided on its inner circumferential side with a bellmouth through which an air flow generated by the revolution of the propeller passes, wherein the bellmouth has an intake portion whose diameter contracts in a curved shape in the direction of the air flow, a cylindrical portion having a cylindrical shape, and a discharge portion whose diameter slantingly expands in the direction of the air flow.