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:
Feb. 19, 2008
Filed:
Jun. 17, 2004
Masahiro Arinaga, Tokyo, JP;
Kunihiko Kaga, Tokyo, JP;
Shoji Yamada, Tokyo, JP;
Katsuhisa Ootsuta, Tokyo, JP;
Hitoshi Kikuchi, Tokyo, JP;
Yoshimi Iwamura, Tokyo, JP;
Yasuyoshi Makino, Tokyo, JP;
Masahiro Arinaga, Tokyo, JP;
Kunihiko Kaga, Tokyo, JP;
Shoji Yamada, Tokyo, JP;
Katsuhisa Ootsuta, Tokyo, JP;
Hitoshi Kikuchi, Tokyo, JP;
Yoshimi Iwamura, Tokyo, JP;
Yasuyoshi Makino, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A blower includes: an impeller on which there are arranged axial flow bladesmounted at circumferential intervals to an outer peripheral surface of a boss; a case surrounding the impeller; and a bell mouth cylindrically constricted to guide gas into the case, wherein an inner diameter of the bell mouth is smaller than an outer diameter of the impeller. Further, each blade has, in the radial direction, a sweepforward wing portion situated on the boss side and exhibiting a positive advance ratio value, and a sweepback wing portion situated on the outer peripheral side of the blade and exhibiting a negative advance ratio value, with the arc length of each blade increasing from the boss side toward the outer peripheral side. Therefore, it is possible to achieve an improvement in ventilation efficiently, through an increase in static pressure and to achieve a reduction in noise.