Stacked tube type heat exchanger

Details Stacked tube type heat exchanger Stacked tube type heat exchanger

1995-10-26

1996-05-21

Flanigan, Allen J.

Heat exchange

Tubular structure

Diverse materials

1651341, 428654, F28F 2108

Patent

active

055180701

ABSTRACT:
In a stacked tube type heat exchanger comprising a plurality of flat tubes and fins alternately stacked in parallel to one another, the flat tube is made of aluminum alloy consisting of 0.04-0.10 wt % of Si, 0.1-0.4 wt % of Fe, 0.2-0.5 wt % of Cu, less than 0.55 wt % of Mn, the remaining portion of Al, and unavoidable impurities, the flat tube is formed by extrusion molding, and the fin is made of aluminum alloy having at least its core material containing more than 1 wt % of Zn, and both surfaces of the fin are clad in a brazing material. Another heat exchanger comprising the flat tube made of the same materials as mentioned above, and formed by extrusion molding but with both surfaces of the tube being coated with the brazing material, and the fin is made of aluminum alloy containing more than 1 wt % of Zn, without having its surfaces coated with the brazing material.
Thus, the stacked tube type heat exchanger having sufficient pitting corrosion resistibility can be obtained, even without having a Zn layer on the tube surface, and, therefore, the conventional step of thermal spraying of Zn is eliminated.

REFERENCES:
patent: 4410036 (1983-10-01), Kanada et al.
patent: 4587701 (1986-05-01), Koisuka et al.
patent: 4716959 (1988-01-01), Aoki
patent: 4749627 (1988-06-01), Ishikawa et al.
patent: 5148862 (1992-09-01), Hashiura et al.
patent: 5260142 (1993-11-01), Kawabe et al.
patent: 5375760 (1994-12-01), Doko

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