Method for manufacturing heat exchanger

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: 2009-12-02
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is practically difficult to use this manufacturing method

Method used

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  • Method for manufacturing heat exchanger
  • Method for manufacturing heat exchanger
  • Method for manufacturing heat exchanger

Examples

Experimental program
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Effect test

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 invention relates to a method for manufacturing an aluminum heat exchanger, in which a zinc thermal sprayed layer is formed on the surface of an aluminum flat tube (2) and then the zinc thermal sprayed tube is combined with aluminum corrugated fins and brazed soldered to the fin. The zinc thermal sprayed pipe (2) is subjected to zinc diffusion treatment by heating before brazing to diffuse zinc into the pipe surface, and brazing is performed thereafter. The heat exchanger manufactured in this way can reliably have a stable sacrificial corrosion layer, and the corrosion resistance is very good. The heat exchanger can be manufactured cost-effectively without major facility changes.

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 requested under 35 U.S.C. §119(e)(1) of Provisional Application No. filed January 20, 2004 under 35 U.S.C. §111(b). 60 / 537,006 filing date entitlement. 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 understand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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