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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.:

US 8945721 B1

PDFFull Text
Date of Patent:
Feb. 03, 2015

Filed:

Feb. 25, 2011

Aluminum alloy heat exchanger

Applicants:

Yasunori Hyogo, Izu, JP;

Michihide Yoshino, Susono, JP;

Inventors:

Yasunori Hyogo, Izu, JP;

Michihide Yoshino, Susono, JP;

Assignee:

Mitsubishi Aluminum Co., Ltd., Tokyo, JP;

Attorney:

Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
B32B 15/04 (2006.01); B32B 15/20 (2006.01); F28F 1/30 (2006.01); F28F 21/08 (2006.01); B23K 1/00 (2006.01); B23K 35/22 (2006.01); B23K 35/362 (2006.01); B23K 35/365 (2006.01); C22C 21/00 (2006.01); C22C 21/12 (2006.01); F28D 1/053 (2006.01); F28F 1/12 (2006.01);
U.S. Cl.
CPC ...
F28F 21/089 (2013.01); B23K 1/0012 (2013.01); B23K 35/22 (2013.01); B23K 35/362 (2013.01); B23K 35/365 (2013.01); C22C 21/00 (2013.01); C22C 21/12 (2013.01); F28F 21/084 (2013.01); F28D 1/05383 (2013.01); F28F 1/126 (2013.01); F28F 2275/04 (2013.01);
Abstract

An aluminum alloy heat exchanger with aluminum alloy tubes is provided by assembling and brazing. A coating which includes from 1 to 5 g/mof Si powder, from 3 to 20 g/mof Zn containing flux, and from 0.2 to 8.3 g/mof binder is formed on the aluminum alloy tubes. The fins contain Zn and 0.8 to 2.0% by mass of Mn, Si in a ratio of 1/2.5 to 1/3.5 relative to the Mn, and less than 0.30% by mass of Fe. A fillet is formed between the tube and the aluminum alloy fin after brazing, and a primary crystal portion is formed in the fillet. A eutectic crystal portion is formed in a portion other than the primary crystal portion, and the electric potential of the primary crystal portion is equal to or higher than the electric potential of the aluminum alloy fin.

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