JPS5922623B2 - Heat exchanger manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a fin-tube heat exchanger.

Aluminum fin-tube heat exchangers conventionally used as condensers and evaporators in air conditioning and refrigeration equipment are generally AIIOO or A3 as shown in Figure 1.
The liquid side passage is constituted by a tube group 1 in which a plurality of tubes 1a made of 003 corrosion-resistant aluminum material are bent in a zigzag shape, and an aluminum brazing material such as A4004 or A4104 is coated on both sides with A3003 corrosion-resistant aluminum as the core material. A clad aluminum brazing sheet is bent into a zigzag shape to form the heat transfer fins 2, and a plurality of the heat transfer fins 2 are inserted and assembled between the tube group 1 and brazed in a furnace such as a vacuum furnace. It is common to have a monolithic structure.

In the conventional heat exchanger as described above, the contact area between each tube 1a and the fin 2 is very small as shown in Figure 1 and C, and the heat transfer efficiency is poor, and the tubes 1a are brazed together. Coupled with the fact that there are almost no parts, there is a problem in that the brazing between the tube 1a and the fins 2 often comes off due to vibrations during use.

Furthermore, between the material of tube 1a and the material of fin 2, tube 1a has a lower potential, and tube 1a has a lower potential than that of fin 2.
The sides often corrode first, and the fin 2 is made of a plating sheet clad with aluminum brazing material to a thickness of 20 to 1596 Japanese hemp compared to the thickness of the core material. At this time, as shown in A in Fig. 1C, some aluminum solder material flows out onto the surface of the tube 1a, so the thickness of the fin 2 decreases by the amount of aluminum solder material that flows out. There were many inconveniences, such as the need to increase the thickness of the wood.

The present invention aims to address the above-mentioned conventional problems, and the method of the present invention will be described below with reference to the embodiment shown in FIG. In the present invention, corrosion-resistant aluminum material (A3003,
Potential key O, 83V) is the core material, and aluminum brazing material (A4004 or A41043 electrode key O, 82) is used only on the outer surface.
A tube material (extrusion molded material, electric resistance welded tube, etc.) clad with V) is bent in a zigzag shape to constitute a tube Ia, and a plurality of tubes 1a are arranged side by side to constitute a tube 1 serving as a liquid side passage. .

Next, as shown in FIG. 2, the tubes 1a are temporarily attached to each other by thermal spraying and filling aluminum brazing material 4 into the concave groove portions 3 formed at the abutting portions of the tubes 1a.

The surface 4a of the filled aluminum brazing material 4 has a tube diameter D
The surface should be almost flat or slightly lower than the surface. The heat transfer fins 2 are made of, for example, Mn (0.5 to 1.596), which has a lower potential than the constituent material of the tube 1a and has a sacrificial effect.
+Zn(1.0~2.0($)+Mg(0.2~0.8
q6) + Si (0.2 to 1.2%) + At (remaining %) aluminum alloy thin plate material (potential key 0.96V) is bent into a zigzag shape.

A plurality of the heat transfer fins 2 are inserted between the tubes 1 and assembled into an integral structure by brazing in a furnace such as a vacuum furnace.

The heat exchanger according to the present invention obtained in this manner adopts a method in which the concave groove portions 3 formed at the abutting portions of the tubes 1a are filled with aluminum brazing material 4 and temporarily attached.
When inserting and assembling the fins 2, there is no need for any jigs to hold the tubes 1a aligned, making handling extremely simple and easy, greatly improving assembly workability, and completing brazing in the furnace. At this time, the tubes 1a are firmly connected together by the filled aluminum solder material 4, and the heat transfer fins 2 are completely soldered to the tube 1 by the filled aluminum solder material 4, so that the tubes 1a The contact area between the fins 2 and the fins 2 is significantly increased, and strength and heat transfer efficiency can be significantly improved.

In addition, since the fin material is made of a Zn-based aluminum alloy that has a sacrificial effect compared to the tube material, the corrosion resistance of the tube is greatly improved, and there are no problems such as a decrease in the thickness of the fin as in the conventional case. This can bring about benefits.

As described above, according to the present invention, it is possible to significantly simplify and improve the efficiency of assembly work, and also to obtain a heat exchanger with excellent strength and durability and high heat exchange efficiency. This can bring about great effects.

[Brief explanation of drawings]

Figure 1 A, C and A are front views of a conventional heat exchanger;
They are an XX enlarged sectional view and a detailed sectional view of a main part. FIGS. 2A, 2B, and 2C are a front view, an enlarged sectional view taken along the line X''-X'', and a detailed sectional view of the main parts of a heat exchanger according to the method of the present invention. 1
a...Tube, 1...Tube group,
2...Heat transfer fin, 3...Concave groove part,
4... Aluminum wax material.

Claims (1)

[Scope of Claims] 1 A plurality of tubes bent in a zigzag shape are lined up to form a tube group serving as a liquid side passage, and heat transfer fins formed by bending a thin plate material in a zigzag shape are provided between the tube groups. In a heat exchanger that is constructed by inserting and assembling multiple tubes and brazing them in a furnace to form an integrated structure, aluminum brazing material is thermally sprayed and filled into the grooves formed at the abutting portions of each tube to temporarily connect the tubes to each other. A method for manufacturing a heat exchanger, which comprises: fixing the heat exchanger, inserting and assembling heat transfer fins, and forming an integral structure by brazing in a furnace. 2 The tube is made of a tube material with a core made of corrosion-resistant aluminum and clad with aluminum brazing material only on the outer surface, and the heat transfer fins are made of Z-based material, which has a lower potential than the above tube material.
2. The method of manufacturing a heat exchanger according to claim 1, wherein the heat exchanger is made of an n-based aluminum alloy material.