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Aluminum heat exchanger

a heat exchanger and aluminum technology, applied in the direction of manufacturing tools, soldering devices, light and heating equipment, etc., can solve the problem of leakage at the joined portion of the flat tub

Inactive Publication Date: 2006-10-05
T RAD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The aluminum-made heat exchanger according to the present invention has a structure as described above, and provides the following effects.
[0015] As described above, by adding Mg of 0.3 to 0.75% by weight to the sacrificial anode material 3, the Mg and the Si of the core metal I combine with each other after the brazing to increase the strength of the base material. Moreover, since the Mg is controlled to be 0.75% or less by weight, the brazing performance with the brazing metal 2 is satisfactorily ensured; and accordingly, an aluminum-made heat exchanger with a high air and liquid tightness can be provided.

Problems solved by technology

That is, there may be a case such that a leakage occurs at a joined portion on the flat tube.

Method used

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Examples

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Embodiment Construction

[0021] An embodiment of the present invention is described below referring to the drawings.

[0022]FIG. 1 shows an enlarged view of a flat tube for an heat exchanger according to the present invention, illustrating a relevant portion before brazing; FIG. 2 shows a plane view of the heat exchanger, illustrating the assembly state thereof; FIG. 3 shows a schematic sectional view taken along a line III-III in FIG. 2; and FIG. 4 shows a front view illustrating a relevant portion of the heat exchanger.

[0023] As shown in FIG. 4, the heat exchanger has many flat tubes 5 disposed parallel to each other at certain intervals and corrugated fins 10 disposed between the flat tubes 5, and both ends of the respective flat tubes 5 are inserted into tube insertion holes in tube plates 6; thus a core is assembled.

[0024] The flat tube 5 is formed, for example, by bending a strip-shaped material into a B-like shape in section as shown in FIG. 1 and FIG. 2. The flat tube according to the present inven...

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Abstract

An aluminum-made heat exchanger including a flat tube is formed by, using an aluminum strip-shaped material coated with a brazing metal on the outer surface of a core metal and coated with a sacrificial anode material at the inner surface side thereof, bending the strip-shaped material in the width direction thereof, wherein many flat tubes are diposed parallel with each other and joined using a flux in a furnace. In order to provide the aluminum-made heat exchanger capable of being satisfactorily brazed and a high strength after brazing, the brazing metal is of an Al—Si alloy, core metal is an Al—Si alloy including Si of 0.4 to 1.2% by weight, and the sacrificial anode material is of an Al—Mg—Zn alloy including Mg of 0.3 to 0.75% by weight.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to an aluminum-made heat exchanger manufactured in such a manner that an aluminum strip-shaped material having a brazing metal and a sacrificial anode material on a core metal is bent in the width direction thereof to form a flat tube; many flat tubes are disposed parallel to each other to structure a core of the heat exchanger, and then subjected to a brazing in a furnace using a brazing flux to integrally fix the core of the heat exchanger. [0002] There is known an aluminum-made heat exchanger manufactured by bending a strip-shaped material coated with a brazing metal on the outer surface, and the seam thereof is integrally joined with a brazing metal. [0003] Also, there is known a flat tube formed into a B-like shape in section. The flat tubes, which are coated with a brazing metal on the outer surface as described above, are disposed parallel to each other at same intervals; and corrugated fins are disposed between...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F19/02B21C37/083B21C37/09B23K35/14B23K35/22B23K35/28C22C21/00C23F13/00F28D1/03F28D1/053F28F1/02F28F1/30F28F1/32F28F9/16F28F19/06F28F21/08
CPCB21C37/083B21C37/09C22C21/00C22C21/06F28F21/089F28D1/0535F28F1/022F28F19/06F28F21/084F28D1/0391
Inventor IGAMI, TAKAZI
Owner T RAD CO LTD
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