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Heat exchanger tube, heat exchanger, and manufacturing method thereof

A technology of heat exchanger tubes and heat exchanger tubes, applied in heat exchange equipment, manufacturing tools, indirect heat exchangers, etc., can solve problems such as volume rate deterioration, and achieve prevention of poor brazing, high quality, and deformation prevention. Effect

Inactive Publication Date: 2007-05-16
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the volume velocity (fill rate) of the base brazing material (pure thermal spray) in the entire thermal spray layer (surface thermal spray layer) including voids worse

Method used

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  • Heat exchanger tube, heat exchanger, and manufacturing method thereof
  • Heat exchanger tube, heat exchanger, and manufacturing method thereof
  • Heat exchanger tube, heat exchanger, and manufacturing method thereof

Examples

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Effect test

example 1

[0169] As shown in Table 1, an Al alloy extruded material (Cu: 0.4% by mass, Mn: 0.21% by mass; the rest is Al) was used to extrude a flat sheet with a width of 16 mm, a height of 3 mm, and a wall thickness of 0.5 mm through an extruder. Porous extruded tube (core part). The surface roughness of the obtained die portion was 10 μm.

[0170] The Al—Si alloy was thermally sprayed onto the upper and lower surfaces of the extruded tube by thermal spray guns of an arc thermal sprayer arranged on the upper and lower sides of the extruder outlet. In this thermal spraying method, the thermal spraying distance was adjusted to 120 mm in an air atmosphere.

[0171] The molten thermal spray particles to be sprayed onto the die attach to the die by cooling from the thermal spray temperature to the temperature of the die by being cooled by the tube when the thermal spray particles reach the core. This is achieved by the core absorbing heat.

[0172] In Table 1, in terms of the degree of c...

example 2

[0177] As shown in Table 1, an extruded tube with a surface roughness Ry of 10 μm was thermally sprayed in a nitrogen atmosphere by arc spraying at a thermal spraying temperature of 5500° C. and a thermal spraying distance of 60 mm. The pipe member having the thermally sprayed layer was pressed with a calender roll to form a brazing layer having a brazing material filling rate of 50%, a thickness of 15 μm, and a surface roughness Ry of 37 μm. Thus, a heat exchanger tube was fabricated in the same manner as above. In this tube, the average equivalent diameter of Si crystals was 0.1 µm.

[0178] Then, a heat exchanger was manufactured using this heat exchanger tube in the same manner as in the above example.

example 3

[0180] As shown in Table 1, an extruded pipe with a surface roughness Ry of 7 μm was thermally sprayed in a nitrogen atmosphere at a thermal spraying temperature of 4800° C. and a thermal spraying distance of 60 mm by arc spraying method. The pipe member having the thermally sprayed layer was pressed with a calender roll to form a brazing layer having a brazing material filling rate of 60%, a thickness of 20 μm, and a surface roughness Ry of 35 μm. Thus, a heat exchanger tube was fabricated in the same manner as above. In this tube, the average equivalent diameter of Si crystals was 0.5 µm.

[0181] Then, a heat exchanger was manufactured using this heat exchanger tube in the same manner as in the above example.

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Abstract

This invention relates to a method of manufacturing an aluminum heat exchanger tube. In forming a thermally sprayed layer 21 on a surface of an aluminum flat tube by thermally spraying Al-Si alloy thermal-spraying particles, quenching the thermally sprayed thermal-spraying particles in a molten state to make them adhere to the tube core 2a. The surface of the thermally sprayed layer 21 is smoothed with, e.g., reduction rolls to form a brazing layer 20. With this method, brazing defects due to fin detachment, erosion to the tube of the brazing material, etc., can be prevented, resulting in good brazing performance.

Description

[0001] This application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2004-113784, filed April 8, 2004, and U.S. Provisional Application No. 60 / 561,903, filed April 14, 2004, which It is hereby incorporated by reference in its entirety. [0002] Cross References to Related Applications [0003] This application was filed pursuant to 35 U.S.C. §111(a) and was filed under 35 U.S.C. §111(b) on April 14, 2004 as required by 35 U.S.C. §119(e)(1) U.S. Provisional Application No. 60 / 561,903 Interests. technical field [0004] The present invention relates to aluminum heat exchangers used, for example, in refrigerating cycles used in automobile air-conditioning units, tubes for such heat exchangers, and methods for their manufacture. [0005] In this disclosure, including the claims, the term "aluminum" includes aluminum and its alloys. Background technique [0006] The following explains the inventor's knowledge of the related art and the problems there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/00B23K31/02F28F1/02F28D1/053F28F9/18
Inventor 南和彦山井智明桥本武典
Owner SHOWA DENKO KK
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