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Heat exchanger tube, heat exchanger, and brazing paste

A technology of heat exchangers and brazing, which is applied in the direction of heat exchange equipment, indirect heat exchangers, heat exchanger types, etc., can solve problems such as difficulty in reducing manufacturing costs and material costs, and achieve easy lightweight and excellent corrosion resistance , the effect of thinning the wall thickness

Active Publication Date: 2017-02-22
FURUKAWA SKY ALUMINUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to reduce manufacturing cost and material cost

Method used

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  • Heat exchanger tube, heat exchanger, and brazing paste
  • Heat exchanger tube, heat exchanger, and brazing paste
  • Heat exchanger tube, heat exchanger, and brazing paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Examples of the heat exchanger tube described above and a heat exchanger manufactured using the above heat exchanger tube will be described below. In this example, 11 types of alloys A1 to A11 having the chemical compositions shown in Table 1 were used to produce figure 1 Tube 1 shown. Afterwards, use the resulting tube 1 assembly figure 2 For the heat exchangers 2 shown, the brazing workability and corrosion resistance of the obtained 11 types of heat exchangers 2 were evaluated. The details will be described below.

[0111]

[0112] The material having the chemical composition shown in Table 1 was heated at 600° C. for 10 hours to perform a homogenization treatment. After the homogenization treatment, the billet was cooled to room temperature, and then heated to 450° C. for hot extrusion. above, such as figure 1 As shown, the pipe main body 10 having a flat cross section perpendicular to the extrusion direction and including a plurality of refrigerant passages...

Embodiment 2

[0134] This example is an example of the heat exchanger 2 in which the content of each component in the coating film 12 is changed by changing the composition of the paste for forming the coating film 12 . In this example, the pipe main body 10 was fabricated using the alloy A1 in Example 1, and the coating films B1 to B25 having the compositions shown in Table 3 were formed to obtain the pipe 1. switch 2. Using the obtained 25 types of heat exchangers 2 (test bodies 21 to 45), the brazability and corrosion resistance were evaluated in the same manner as in Example 1. Table 4 shows the results.

[0135] As can be seen from Table 3 and Table 4, since the test bodies 21 to 35 used the coating films B1 to B15 having the above-mentioned specific composition, both brazing properties and corrosion resistance showed favorable results.

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Abstract

This heat exchanger tube is provided with: a tube main body configured from an aluminium alloy; and a coating film applied to the surface of the tube main body. The coating film includes a binder, and a mixed power including: at least 1 g / m<2> but not more than 7 g / m<2> of a Si powder; at least 0.2 g / m<2> but not more than 4.0 g / m<2> of a Zn powder; at least 0.5 g / m<2> but not more than 5.0 g / m<2> of a first flux powder configured from a Zn-containing compound; and at least 5 g / m<2> but not more than 20 g / m<2> of a second flux powder configured from a Zn-free compound. The total amount of the mixed powder in the coating film is not more than 30 g / m<2>. The proportion of the binder in the coating film is 5-40 mass%.

Description

technical field [0001] The present invention relates to a heat exchanger tube, a heat exchanger using the heat exchanger tube, and a brazing paste used for brazing the heat exchanger. Background technique [0002] Aluminum alloys that are lightweight and have high thermal conductivity are often used in automotive heat exchangers such as evaporators and condensers. The heat exchanger has tubes through which the refrigerant flows, and fins for exchanging heat between the refrigerant and the air outside the tubes, and the tubes and the fins are joined by brazing. Fluoride-based fluxes are often used for joining tubes and fins. [0003] When a tube used in a heat exchanger for an automobile penetrates due to corrosion during use, refrigerant leakage occurs, and thus the function as a heat exchanger cannot be realized. Therefore, in order to improve corrosion resistance, a sacrificial anode layer is formed on the surface of the tube. Conventionally, as a method of forming a sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363B23K1/00B23K1/19B23K3/06B23K35/28C22C21/00F28D1/053F28F19/06F28F21/08B23K101/14B23K103/10
CPCB23K1/19C22C21/00B23K1/0012B23K1/008B23K2103/10B23K2101/14B23K35/0244B23K35/025B23K35/282B23K35/3605B23K35/3613F28D1/05366F28F1/022F28F1/126F28F21/084F28F2245/00F28F2275/04B23K3/06B23K35/28F28D1/053F28F19/06F28F21/08B23K1/00
Inventor 山下尚希熊谷英敏木贺大悟
Owner FURUKAWA SKY ALUMINUM CORP
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