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:
Jan. 31, 2012
Filed:
May. 08, 2008
Tsuyoshi Eguchi, Hyogo, JP;
Atsushi Suzuki, Aichi, JP;
Mitsuhiro Nakao, Hyogo, JP;
Tetsuo Tominaga, Hyogo, JP;
Tsuyoshi Eguchi, Hyogo, JP;
Atsushi Suzuki, Aichi, JP;
Mitsuhiro Nakao, Hyogo, JP;
Tetsuo Tominaga, Hyogo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
It is intended to provide a centrifugal blower capable of suppressing the generation of noise including periodic noise that is caused by interference between a tongue and an impeller. The centrifugal blower is provided with an impeller () provided with plural blades around a rotating shaft; a casing () which houses the impeller () and has a suction portion at one end in an axial line direction of the rotating shaft; a spiral flow passage () formed around the impeller () in the casing (); and a tongue () for suppressing inflow of air from a winding end to a winding origin of the spiral flow passage (). The centrifugal blower is characterized in that an extension () is provided at a tip of the tongue () in a reverse rotational direction that is reverse to a rotational direction of the impeller () in such a manner that it projects in the reverse rotational direction by a length that varies depending on the position in the axial line direction and that the gap between itself and the impeller () in the radial direction of the impeller () is kept approximately constant.