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:
Nov. 01, 1983
Filed:
Jul. 21, 1981
Masahiro Abe, Chiba, JP;
Masayuki Fujio, Yachio, JP;
Hitachi Ltd., Tokyo, JP;
Abstract
A vortex blower including a casing, an annular air passageway defined in the casing, an impeller mounted for rotation in the casing, a partition wall, a suction port and a discharge port disposed on both sides of the partition wall and communicated with each other through the annular air passageway, and an extension wall formed by extending at least one wall surface of the partition wall along a surface of rotation of the impeller, the extension wall tapering in going toward its forward end. The blower is further formed with at least one projecting wall continuous with the partition wall and an inner wall surface of the air passageway in the vicinity of the partition wall, for shutting off the noise produced in the vicinity of the partition wall and preventing it from being transmitted to outside to thereby reduce the noise produced by the blower.