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:
Oct. 13, 2015
Filed:
Jun. 06, 2011
Seiji Sato, Tokyo, JP;
Tsuyoshi Eguchi, Tokyo, JP;
Atsushi Suzuki, Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
In a multi-blade centrifugal fan including an impeller () rotatably disposed in a casing and composed of a disc-shaped hub (), a plurality of blades (), and an annular shroud (), the blades () are curved in a concave shape on a pressure side in a cross-section perpendicular to a rotating shaft of the impeller () and have a curved shape that is backward-swept near a leading edge (C) thereof and that is forward-swept near a trailing edge (D) thereof, the inner diameter of the cascade of blades () increases gradually from the hub () toward the shroud (), and the diameter of a maximum-curvature position (B) where the curvature of the curved shape is maximized increases gradually from the hub () toward the shroud ().