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. 08, 2014
Filed:
Dec. 14, 2010
Chisachi Kato, Tokyo, JP;
Atsushi Yamaguchi, Kanagawa, JP;
Akira Ueda, Kanagawa, JP;
Kazuhiro Nitta, Kanagawa, JP;
Akihiro Otsuka, Sr., Kanagawa, JP;
Tadashi Katsui, Kanagawa, JP;
Masahiro Suzuki, Kanagawa, JP;
Yoshihiko Aizawa, Nagano, JP;
Honami Oosawa, Nagano, JP;
Chisachi Kato, Tokyo, JP;
Atsushi Yamaguchi, Kanagawa, JP;
Akira Ueda, Kanagawa, JP;
Kazuhiro Nitta, Kanagawa, JP;
Akihiro Otsuka, Sr., Kanagawa, JP;
Tadashi Katsui, Kanagawa, JP;
Masahiro Suzuki, Kanagawa, JP;
Yoshihiko Aizawa, Nagano, JP;
Honami Oosawa, Nagano, JP;
The University of Tokyo, Tokyo, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Fujitsu Limited, Kawasaki-Shi, JP;
Abstract
A counter-rotating axial flow fan in which the shape of stationary blades of a middle stationary portion is optimized to reduce noise is provided. Defining the maximum axial chord length of front blades as Lf, the maximum axial chord length of rear blades as Lr, and the maximum axial chord length of stationary blades as Lm, a relationship of Lm/(Lf+Lr)<0.14 is satisfied. Defining the maximum dimension between the blade chord for lower surfaces of the stationary blades and the lower surfaces as K, the maximum axial chord length Lm of the stationary blades satisfies a relationship of Lm/K>5.8.