JPS645994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of processing a flat tube used in a heat exchanger such as a condenser of an air conditioner for an automobile. Conventionally, there is an exchanger of this type as shown in FIG. 1, for example. This heat exchanger (hereinafter referred to as a condenser) is a heat exchanger (hereinafter referred to as a condenser) in which a heat exchange medium (hereinafter referred to as a refrigerant) such as a high temperature and high pressure liquid refrigerant flows.
Flat book tubes 1 and 2 and corrugated fins 3
and two headers 4 and 5, and the flat tubes 1 and 2 are bent in a meandering manner to form a plurality of parallel parts 1a and 2a. The corrugated fins 3 are parallel parts 1a and 2a of the flat tubes 1 and 2.
It is installed between. The two headers 4 and 5 constitute a refrigerant introduction side and a refrigerant outlet side, respectively.
In addition, threaded portions (not shown) for connecting to other pipes are respectively formed.

As shown in FIG. 2, one of the headers 4 constituting the refrigerant introduction side has two through holes 42 formed in its main body 41, and one end of each of the flat tubes 1 and 2 has two through holes. It is fitted into each of the parts 42 and joined by brazing. The other header 5 constituting the refrigerant outlet side has a main body 51 with one end open as shown in FIGS. 3 and 4, and a main body 5.
The main body 51 has a cap 52 covering one end of the main body 51, and two notches 53 extending inward from the opening edge are formed at two places on the side wall of the main body 51. The other ends of the flat tubes 1 and 2 are fitted into each of the two notches 53, and the cap 52 is attached to the main body 51 so that the flat side walls of the flat tubes 1 and 2 are in close contact with the open end surface of the cap 52. After covering, the flat tubes 1 and 2 and the cap 52 are brazed to the main body 51.

In order to assemble the capacitor having the above configuration, first, the two flat tubes 1 and 2 are bent in a meandering manner to form a plurality of parallel parts 1a and 2a, respectively, and then the space between the parallel parts 1a and 2a is The corrugated fins 3 are attached to the tubes 1, 2, and the corrugated fins 3 are positioned and fixed using an appropriate jig (not shown), and the tubes 1, 2 and the corrugated fins are placed in a heating furnace in this state. The corrugated fins 3 are then brazed together, and finally both ends of the two flat tubes 1 and 2 are fitted into the two headers 4 and 5 described above and torch brazed.

However, in the conventional assembly work of such a capacitor, the flat tubes 1 and 2 and the corrugated fin 3 are separated during brazing in a heating furnace.
For example, as shown in Fig. 5, at the ends of the flat tubes 1 and 2 after brazing in the heating furnace, the gap between them changes from the state when they are positioned and fixed. The gap d is likely to change or deform as shown by the chain line in the figure. Therefore, in order to connect to the headers 4 and 5, two flat tubes 1 and 2 are required.
It is necessary to correct the shape and gap of the ends of the flat tubes 1 and 2, and the ends of the flat tubes 1 and 2 to which the refrigerant outlet header 5 is to be joined are close to the part where they are brazed with the corrugated fins 3. There is a problem that correction is troublesome and the workability of assembling the capacitor is low.

The present invention has been made to provide a method for processing a flat tube, which can solve the above-mentioned problems and improve the workability of assembling heat exchangers such as condensers. The tube is bent in a meandering manner to form a plurality of parallel portions, a corrugated fin is interposed between the plurality of parallel portions, the plurality of parallel portions and the corrugated fin are brazed, and the middle 1 of the flat tube is It is characterized in that the unbrazed portion at the location is cut to obtain two cut openings spaced apart from each other by a defined distance, and the two cut openings are joined to one header.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 6a, b, and c are schematic configuration diagrams showing one processing mode of one flat tube for carrying out the present invention. First, as shown in FIG. 6a, one flat tube 6 is bent in a meandering manner to form a plurality of parallel parts 61. Next, as shown in FIG. 6b, the corrugated fins 3 are interposed between the plurality of parallel parts 61, and these are placed in a heating furnace.
and corrugate fin 3 are brazed together. In addition,
At this time, since it is only necessary to interpose the corrugated fin 3 between the parallel parts 61 of one flat tube 6, conventional jigs can be omitted or simplified, and the work efficiency of assembling the capacitor is improved. can contribute to

Next, as shown in FIG. 6c, the non-brazed portion at one midpoint of the flat tube 6 taken out from the heating furnace is cut parallel to its width direction by press working. Thereby, as shown in FIG. 7, two cutting openings 62, 62 are obtained in the unbrazed portion, spaced apart from each other by a defined dimension. Note that since the non-brazed portion is cut after brazing one flat tube 6 and the corrugated fin 3, deformation of the cut portion due to heating can be avoided, and the gap between the two cutting openings 62 and their The shape can be made into the required spacing and shape. Therefore, these two cutting openings 62 can be quickly fitted into each of the two notches 52 of the refrigerant outlet header 5 and brazed immediately after cutting, without the need for any correction. For joining both ends of the flat tube 6 and the refrigerant introduction header 4, after the parallel portion 61 and the fins 3 are brazed, they are brazed to the header 4 in the same manner as in the conventional art.

Although the above embodiment has been described with respect to a condenser for an automobile cooling system, the present invention can also be applied to a heat exchanger for other uses.

As explained above, according to the present invention, two flat tubes in a heat exchanger can be combined by brazing a corrugated fin on one flat tube and then cutting one point in the middle of the flat tube. Moreover, the ends formed by cutting the two flat tubes do not need to be straightened because they are not affected by the heat during brazing of the corrugated fins. Without,
These can be quickly joined to the header,
Therefore, the efficiency of assembling the heat exchanger can be improved.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a conventional capacitor using two flat tubes, and Figure 2 is the same as in Figure 1.
3 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 4 is an enlarged sectional view taken along the - line in FIG. 3, and FIG.
The figure is an enlarged view of the other ends of the two flat tubes.
Figures a, b, and c are schematic configuration diagrams showing one processing aspect of one flat tube for carrying out the present invention, and Figure 7 is an enlarged view of a cut portion of the non-brazed portion of the flat tube. . 3...Corrugated fin, 5...Hetsuda, 6...
...Flat tube, 61...Parallel portion, 62...Cutting opening.

Claims (1)

[Claims] 1. A single flat tube is bent in a meandering manner to form a plurality of parallel parts, a corrugated fin is interposed between the plurality of parallel parts, and the plurality of parallel parts and the corrugated fin are brazed, A heating method characterized in that the unbrazed portion at one intermediate point of the flat tube is cut to obtain two cut openings separated from each other by a prescribed distance, and the two cut openings are joined to one header. Processing method of flat tube for exchanger.