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Heat exchanger made of aluminum alloy and method of producing same

A technology of heat exchangers and heat sinks, applied in the direction of heat exchanger fixation, heat exchange equipment, manufacturing tools, etc., can solve the problems of inability to realize the full function of the heat exchanger and the reduction of heat exchange performance, and achieve the suppression of preferential corrosion, Effect of preventing preferential corrosion and reducing Zn concentration difference

Active Publication Date: 2010-03-24
MARELLI CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the welding seam is preferentially corroded, the fins are detached from the front surface of the tube (hereinafter referred to as detachment), so the heat exchange performance is reduced, and there is a problem that the sufficient function of the heat exchanger cannot be realized.

Method used

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  • Heat exchanger made of aluminum alloy and method of producing same
  • Heat exchanger made of aluminum alloy and method of producing same
  • Heat exchanger made of aluminum alloy and method of producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0146] Al alloys for tubes with the composition shown in Table 1 and Al alloys for heat sinks with the composition shown in Table 2 were melted. In addition, Al alloys for the core material, Al alloys for the sacrificial material layer, and Al alloys for the brazing material layer having the compositions shown in Table 3 were melted.

[0147] After the tube is homogeneously heat-treated with an Al alloy, it is prepared by hot extrusion Figure 4 , Figure 6A The cross-sectional shape shown (wall thickness 0.30mm×width 18.0mm×overall thickness 1.5mm: side flat surface height 0.6mm, corner R: 0.45mm), (side flat surface height 0.9mm, corner part R: flat tube 3 of 0.3 mm). Additionally, prepare Figure 6B and Figure 7B The side S shown is a pipe 31 in an arc shape (arc radius: 0.75 mm, 1.5 mm), Figure 6C The sides shown are beveled (90° included angle) tubes.

[0148] After the Al alloy for heat sinks was homogeneously heat-treated, hot rolling and cold rolling were perfo...

Embodiment 2

[0178] Except that the composition of the aluminum alloy for tubes was set to the composition shown in Table 5, a heat exchanger 100 was produced in the same manner as in Example 1, and the depth of corrosion on the tube 3 and the residual rate of the fins 4 were measured. The results are shown in Table 5. In addition, No. 4 in Table 4 was used as the brazing composition coated on the pipe 3 .

[0179] table 5

[0180] Tube

[0181] As shown in Table 5, the corrosion resistance of the tube 3 and the residual ratio of the fins 4 changed depending on the Mn content and the Si content of the tube 3 . For this reason, the preferred ranges of the present invention are set as follows: Mn is 0.15-0.45%, and Si is 0.20-0.50%.

Embodiment 3

[0183] Except that the composition of the aluminum alloy for fins was set to the composition shown in Table 6, a heat exchanger 100 was prepared in the same manner as in Example 1, and the depth of corrosion on the tube 3 and the residual rate of the fins 4 were measured. The results are shown in Table 6. In addition, No. 4 in Table 4 was used as the brazing composition coated on the pipe 3 .

[0184] Table 6

[0185] cooling

[0186] As shown in Table 6, the corrosion resistance of the tube 3 and the residual ratio of the fins 4 vary depending on the constituent element contents of the alloy constituting the fins 4 . For this reason, in order to obtain a high heat sink bonding rate and excellent corrosion resistance, the following ranges are required: Zn: 1.20-1.80%, Si: 0.70-1.20%, Fe: 0.30-0.80%, and Mn: 0.90-1.50%. In addition, regarding Zr, V, and Cr, it is also known that the preferred ranges in the present invention are Zr: 0.05-0.20%, V: 0.01-0.10%, and Cr:...

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Abstract

A heat exchanger comprising a tube, a fin, and a header pipe, wherein the tube contains, in mass %, 0.15 to 0.45% of Mn, 0.20 to 0.50% of Si, and the balance of A1 and unavoidable impurities, and is coated with a coating of brazing composition containing 1.0 to 5.0g / m 2 of Si powder, 4.0 to 10.0 g / m 2 of KZnF 3 , and 0.5 to 3.0 g / m 2 of binder; the fin contains, in mass %, 1.20 to 1.80% of Zn, 0.70 to 1.20% of Si, 0.30 to 0.80% of Fe, 0.90 to 1.50% of Mn, one or two or more selected from 0.05 to 0.20% of Zr, 0.01 to 0.10% of V, and 0,01 to 0.10% of Cr, and the balance of Al and unavoidable impurities; and the header pipe comprises a core material, outer sacrificial corrosion protection material, and an inner brazing material.

Description

technical field [0001] The present invention relates to an aluminum alloy heat exchanger and a manufacturing method thereof, and more particularly to an aluminum alloy heat exchanger capable of suppressing detachment of fins from tubes and a manufacturing method thereof. Background technique [0002] In aluminum alloy heat exchangers manufactured by brazing with tubes, fins, and headers as the main components, brazing sheets coated with Al-Si alloy brazing filler metals have been used more and more widely, but even if they are not used The brazing sheet can also be cheaply obtained by coating the front surface of an extruded tube (hereinafter referred to as a tube) with a brazing filler metal composition composed of Al-Si alloy powder or Si powder and a mixture of flux and binder. manufactured products. [0003] However, due to heating during brazing, Si diffuses from the front of the tube to the inside, so the concentration of Si is high on the front and low inside, so a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D1/04F28F21/08F28F1/12F28F19/06B23K1/00
CPCF28F9/06B23K1/0012F28F21/084F28D1/05366B21D53/08F28F2275/04
Inventor 曽我部诚广船津拓未新滨正刚兵库靖宪胜又真哉麻野雅三
Owner MARELLI CORP
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