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Heat exchanger, method for manufacturing the same, and heat exchanging tube

A technology of heat exchanger and thermal spraying, which is applied in the field of heat exchanger tubes, can solve problems such as difficult to use manufacturing methods, and achieve the effect of improving corrosion resistance and preventing fins from detaching

Inactive Publication Date: 2007-02-14
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is practically difficult to use this manufacturing method

Method used

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  • Heat exchanger, method for manufacturing the same, and heat exchanging tube
  • Heat exchanger, method for manufacturing the same, and heat exchanging tube
  • Heat exchanger, method for manufacturing the same, and heat exchanging tube

Examples

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example 1

[0087] Using an extruded material made of aluminum alloy (0.4wt% copper-0.15wt% manganese-the rest is aluminium), an extruder with a width of 16mm, a height of 3mm and a wall thickness of 0.5mm can be extruded Flat perforated tube. On the other hand, above and below the exit of the extruder, thermal spray guns of an arc sprayer are installed to thermally spray zinc onto the upper and lower surfaces of the extruded tube to form a zinc thermal spray coating.

[0088] At this time, as shown in Table 1, the zinc adhesion amount in the zinc thermal spraying treatment was adjusted to 6g / cm 2 , and the area ratio to the entire tube surface was adjusted to 60%. Subsequently, the zinc thermal sprayed pipe 2 was subjected to zinc diffusion treatment of the zinc thermal sprayed layer in a nitrogen atmosphere furnace under heating conditions of 480° C.×2 hours. Thus, the zinc diffusion layer 20 is formed.

[0089] Use these tubes 20 to temporarily assemble into the multi-flow heat exch...

example 2

[0111] As shown in Table 1, the adhesion achieved by zinc thermal spraying treatment is set to 7g / cm 2 , and the area ratio is set to 65%. Diffusion treatment and brazing treatment were performed in the same manner as described above, and the zinc concentration of the surface between the fins and the maximum zinc concentration of the fillet eutectic portion were measured, and the same test was performed.

example 3

[0113] As shown in Table 1, the adhesion achieved by zinc thermal spraying treatment is set to 8g / cm 2 , and the area ratio is set to 70%. Diffusion treatment and brazing treatment were performed in the same manner as described above, and the zinc concentration of the surface between the fins and the maximum zinc concentration of the fillet eutectic portion were measured, and the same test was performed.

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Abstract

The present invention is directed to a method for manufacturing a heat exchanger in which a Zn thermally sprayed layer is formed on a surface of an aluminum flat tube 2 and then the Zn thermally sprayed tube is combined with an aluminum corrugated fin and brazed to the fin. The Zn thermally sprayed tube 2 is subjected to a Zn diffusion treatment by heating the tube before the brazing to diffuse the Zn in the tube surface, and thereafter the brazing is performed. The heat exchanger manufactured in this way can assuredly have a stable sacrifice corrosion layer and is excellent in corrosion resistance. The heat exchanger can be manufactured efficiently without major facility changes at low cost.

Description

[0001] This application claims the benefit of Japanese Patent Application No. 2004-4542, filed January 9, 2004, and U.S. Provisional Application No. 60 / 537,006, filed January 20, 2004, both of which are incorporated by reference in their entirety This serves as a reference. [0002] Cross References to Related Applications [0003] This application is an application filed under 35 U.S.C. §111(a) and required under 35 U.S.C. §119(e)(1) to be filed under 35 U.S.C. §111(b) on January 20, 2004 Filing Date Benefit of Application No. 60 / 537,006. technical field [0004] The present invention relates to a heat exchanger in which a sacrificial corrosion layer is formed on the tube surface by zinc thermal spraying, a method of manufacturing the heat exchanger, and tubes for the heat exchanger. [0005] In this disclosure, the term "aluminum" is used to include aluminum and its alloys. Background technique [0006] The description below sets forth the inventor's understanding of th...

Claims

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Application Information

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IPC IPC(8): F28F19/06F28D1/053F28F1/02F28F1/30
Inventor 南和彦山井智明小岛正博
Owner SHOWA DENKO KK
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