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. 11, 2011
Filed:
Aug. 07, 2007
Shizu Ishikawa, Chiba, JP;
Fumiaki Ishida, Sakura, JP;
Shizu Ishikawa, Chiba, JP;
Fumiaki Ishida, Sakura, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
The present invention aims at providing a diagonal flow fan or a silencer for the diagonal flow fan, which have the same outer shape as a suction port and are compact, and can also obtain an effective sound absorbing effect of a moderate frequency range. In the diagonal flow fan comprising a diagonal flow impellerdisposed with a bladeso as to obliquely send an air to an axis of rotation, a fan casingfor covering this diagonal flow impeller, and a suction portfor sucking the fluid in the direction to the axis of rotation of this fan casing, the open front side of the suction portis provided with a silencing portion comprising a shieldand a punching metal, so that the noise of the moderate frequency range of 500 to 1000 Hz generated in the diagonal flow fan was suppressed.