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:
Apr. 07, 2009
Filed:
Dec. 21, 2006
Masayuki Hirota, Narashino, JP;
Satoshi Ibori, Yachimata, JP;
Tomoya Kamezawa, Narashino, JP;
Jiangming Mao, Narashino, JP;
Masahiro Hiraga, Yotsukaidou, JP;
Masayuki Hirota, Narashino, JP;
Satoshi Ibori, Yachimata, JP;
Tomoya Kamezawa, Narashino, JP;
Jiangming Mao, Narashino, JP;
Masahiro Hiraga, Yotsukaidou, JP;
Hitachi Industrial Equipment System Co., Tokyo, JP;
Abstract
The present invention provides an electric power converter in which a tip portion of a cooling fin on an air flow inlet side is limited to flow a large quantity of air around a connection portion, where the fin efficiency is high, of a base surface of the cooling fin and the fin so that the cooling efficiency of the cooling fin can be improved. By providing the limiting member, air or atmosphere flowing into the cooling fin is directed to flow toward the fin near the base surface. Further, by providing the limiting member, an area of a portion from which the air or atmosphere flows into the cooling fin is also limited so that the velocity of the air or atmosphere flow becomes high. By these functions and the like, the cooling efficiency of the cooling fin can be increased as compared to the prior art.