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:
Jul. 01, 2014
Filed:
Dec. 14, 2010
Chisachi Kato, Tokyo, JP;
Atsushi Yamaguchi, Kanagawa, JP;
Akira Ueda, Kanagawa, JP;
Kazuhiro Nitta, Kanagawa, JP;
Akihiro Otsuka, 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, Kanagawa, JP;
Tadashi Katsui, Kanagawa, JP;
Masahiro Suzuki, Kanagawa, JP;
Yoshihiko Aizawa, Nagano, JP;
Honami Oosawa, Nagano, JP;
The University of Tokyo, Tokyo, JP;
Fujitsu Limited, Kawasaki-shi, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
A counter-rotating axial flow fan with improved characteristics and reduced noise compared to the related art can be provided. Defining the number of front blades as N, the number of stationary blades as M, and the number of rear blades as P, and defining the maximum axial chord length of the front blades as Lf, the maximum axial chord length of the rear blades as Lr, the outside diameter of the front blades as Rf, and the outside diameter of the rear blades as Rr, the counter-rotating axial flow fan satisfies the following two relationships: N≧P>M; and Lf/(Rf×π/N)≧1.25 and/or Lr/(Rr×π/P)≧0.83.