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. 18, 2017
Filed:
Sep. 13, 2013
Minebea Co., Ltd., Kitasaku-Gun, Nagano, JP;
Takako Otsuka, Fukuroi, JP;
Seiya Fujimoto, Fukuroi, JP;
Takayuki Yamasaki, Fukuroi, JP;
Masaki Ogushi, Fukuroi, JP;
Minebea Co., Ltd., Nagano, JP;
Abstract
A centrifugal fan includes an impeller, and a lower casing provided below the impeller. The impeller includes an upper shroud having an upper portion formed with an inlet, a lower shroud, and a plurality of blades arranged along a circumference direction between the upper shroud and the lower shroud. The blades extend from an inner side area to an outer side area in a radial direction, and are only connected to the lower shroud with the inner side area such that at least an outer circumferential side portion of each blade faces an upper surface of the lower casing. A surface of the lower casing, which faces the impeller, configures a portion of a wall surface which guides the fluid introduced from the inlet. A surface of each blade at a side of a leading edge portion is formed with a discontinuous portion having a step shape.