JPS5844317B2 - 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.

Conventionally, aluminum fin-tube heat exchangers used as condensers and evaporators in cooling and freezing equipment are generally A1100 or A300, as shown in Figure 1.
A source side passage is constituted by a tube group 1 in which a plurality of tubes 1a made of corrosion-resistant aluminum material are bent in a zigzag shape, and the core material is made of A3003 corrosion-resistant aluminum, and aluminum brazing material such as A4004 or A4104 is coated on both sides of the tube group 1. The heat transfer fins 2 are formed by bending the clad aluminum plating sheet in a zigzag shape, and a plurality of the heat transfer fins 2 are inserted and assembled between the tube group 1 and used for brazing in a furnace such as a vacuum furnace. It is common to have an integrated 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 soldering 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 21/i
It is composed of a plating sheet clad with aluminum brazing material that is about 20 to 15 thick compared to the thickness of the core material, but when brazing in the furnace, the aluminum brazing material tube is used as shown in A in Figure 1. As some of the aluminum flows out onto the surface of 1a, the thickness of the fin 2 decreases by the part of the aluminum alloy that flows out, and the thickness of the core material must be increased in advance to account for this decrease in thickness. There were many inconveniences.

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 embodiments shown in FIGS. 2 to 5.

In the present invention, corrosion-resistant aluminum material (AIloo or A3003
) tube material (extruded material or ERW tube, etc.)
The tubes 1a are formed by bending them in a zigzag shape, and a plurality of tubes 1a are arranged side by side to form a tube group 1 serving as a source side passage.

The heat transfer fins 2 are formed by bending a thin plate made of the same corrosion-resistant aluminum material (AIloo or A3003) into a zigzag shape.

After inserting and assembling the heat transfer fins 2 between the tube group 1, the area formed by the tubes 1a and the upper and lower surfaces of the heat transfer fins 2 is a square triangle, as shown in FIGS. Inside the space 3, tubes 1a, 1 forming the space 3
a and the heat transfer fins 2 inscribed or nearly inscribed, and the cross section is approximately circular or almost triangular (A40
04 or A4104) are inserted one by one, and heated in a vacuum furnace or the like while temporarily assembled using a jig.

Then, the wire 4 made of aluminum solder melts and fills the substantially triangular space 3 as shown in 4' as shown in FIG. 5, and also brazes the tubes 1a and the upper and lower surfaces of the heat transfer fins 2.

In the heat exchanger thus completed, each tube 1a
Since the entire surface of the tube 1a and the heat transfer fins 2 are connected via the filler 4' made of brazing material, the heat transfer area from the tube 1a to the heat transfer fins 2 increases significantly, and the heat exchange efficiency decreases. Not only can this be greatly improved, but it can also bring about extremely beneficial effects such as greatly improving the strength of the product by increasing the brazed surfaces between the tubes and between the tubes and the heat transfer fins.

Furthermore, both the tube material and heat transfer fin material are made of general corrosion-resistant aluminum□
Since no aluminum brazing material is used, the material is easily available, the material cost is low, and the overall cost can be reduced.

[Brief explanation of the drawing]

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. Figure 2A shows a front view and a side view of a heat exchanger according to the method of the present invention, and Figures 3 and 4 are cross-sectional views of main parts showing an example of a temporarily assembled state, respectively, showing an embodiment of the present invention. There is. FIG. 5 is a cross-sectional view of the main parts of the parts shown in FIGS. 3 and 4, showing the state after furnace brazing. 1a...Tube, 1...Tube group, 2...Heat transfer fin, 3...Space, 4...Wire made of aluminum brazing material.

Claims (1)

[Claims] 1 A plurality of tubes made of corrosion-resistant aluminum material bent in a zigzag shape are lined up to form a tube group serving as a source side passage, and a thin plate material made of corrosion-resistant aluminum material is bent in a zigzag shape between the tube groups. Insert and assemble the heat transfer fins, and inscribe a wire rod made of aluminum brazing material into the triangular space formed between each tube of the tube group and between the top or bottom surface of the heat transfer fin. Alternatively, a method for manufacturing a heat exchanger characterized by inserting the heat exchanger in a state close to internal contact and configuring these into an integral structure by brazing in a furnace.