JP2857896B2 - Heat exchanger manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a heat exchanger used for a large-sized refrigeration apparatus such as a commercial refrigerator or a showcase evaporator. .

<Conventional technology> Heat exchangers used in large refrigeration units
In general, refrigerant tubes are arranged in multiple rows in consideration of performance, storage space, and the like.

FIG. 7 shows a typical structure in the case where this heat exchanger is manufactured by a conventional fin tube type heat exchanger.

In this conventional example, a number of fins 2 are attached to two refrigerant tubes 1 in parallel at regular intervals to form one unit, and in the case shown in the figure, three units are arranged. Then, the two refrigerant tubes 1 at one end in one unit are welded and connected by a U-shaped bend tube 3, and one refrigerant tube 1 at the multi-end is connected to the refrigerant tube 1 of the next unit by a U-shaped bend. The pipes 3 are welded and connected.
Thus, a single flow path is formed as a whole.

Therefore, in the case of the conventional example shown in FIG. 7, it is necessary to use ten U-shaped bend pipes 3 for welding at ten places, and also to process and weld two open ends of the refrigerant pipe 1 which is the inlet and outlet of the refrigerant. is there.

<Problems to be solved by the invention> However, in the case of the conventional example shown in FIG. 7, a large number of U-shaped bend tubes 3 must be used.
There are many disadvantages in that it takes time and labor to weld the mold bend tube 3, and there is a possibility that the refrigerant leaks from the welded portion, thus increasing the manufacturing cost.

<Means for Solving the Problem> The present invention has been invented to solve the above-mentioned problems, drawbacks and disadvantages which have not been solved conventionally. The heat exchange unit is configured by attaching the heat exchange units in parallel at a constant interval, and a large number of the heat exchange units are continuously formed, and the heat exchange units between the refrigerant tubes are bent.
Bending at the bend portion to form a plurality of heat exchange groups by arranging the heat exchange portions in a meandering shape, and furthermore, one of the bend portions of the two refrigerant pipes connecting each heat exchange group. And bending the other and superimposing the heat exchange groups,
A method for manufacturing a heat exchanger, characterized in that the cut portions of the bend portions are welded and connected so that the two refrigerant tubes form one flow path.

<Example> Hereinafter, the present invention will be described with reference to the drawings of the example.

FIG. 1 shows a basic member of a heat exchanger of the present invention, in which two long refrigerant pipes 1 through which a refrigerant such as chlorofluorocarbon gas flows are arranged in parallel. The fins 2 are mounted in parallel at regular intervals to constitute the heat exchange section 4.

A large number of heat exchange portions 4 each formed by a desired number of fins 2 are formed continuously, and a portion between the heat exchange portions 4 of the refrigerant pipe 1 is defined as a bend portion 5.

The length of the heat exchange unit 4 is set according to the scale and performance of the heat exchanger to be manufactured, and the number of fins 2 constituting the heat exchange unit 4 and the interval between them are also corresponding to the above. It is determined.

Next, in the above-mentioned combination of the refrigerant tube 1 and the fins 2, for example, the bend portion 5 is bent left and right in a state where the two refrigerant tubes 1 are vertically positioned, and the heat exchange portion 4 is one unit. To form a heat exchange group 6.

Then, a plurality of heat exchange groups 6 (three in the case of the embodiment of FIG. 2) are formed with the bend portion 5 being continuous.

Further, one of the bend portions 5 of the two refrigerant tubes 1 connecting the heat exchange groups 6 is cut, and the other is bent to overlap the heat exchange groups 6. This cutting is performed in advance so that an unreasonable load is not applied to the bend portion 5 on the side opposite to the bending direction at the time of bending. In the embodiment of FIG. 2, a and b and c and d are used. The part will be cut.

FIG. 3 shows a state in which the three heat exchange groups 6 are superimposed as described above, and in this state, two refrigerant pipes 1 become one flow path. The cut portion of the bend portion 5 is welded and connected to manufacture a heat exchanger (see FIGS. 4 to 6).

That is, in the illustrated embodiment, the two ends e and f, which are both ends of the two refrigerant tubes 1 at the beginning of molding, are connected by welding, respectively.
The portions a and b cut at the time of bending are connected by welding with, for example, a U-shaped bend pipe 3, and the portions c and d cut at the same time are left open for the inflow and outflow of the refrigerant. State. That is, while the length of the refrigerant pipe 1 is made long, the number of welding points is limited to only three places including both ends, and by this connection, the refrigerant pipe 1 can be made into one flow path.

Although the present invention has been described with reference to the embodiment of the drawings, the present invention is not limited to the above-described embodiment, and can be implemented in any manner without changing the configuration described in the claims.

For example, if the pitch of the fins is made coarse on the air inflow side and the pitch of the fins is made dense on the air outflow side, heat exchange efficiency can be improved and condensation water adhering to the fins freezes. It is possible to prevent the fins from gradually becoming larger and forming a bridge between the fins to cause clogging.

<Effects of the Invention> In summary, according to the present invention, since the number of welding points is extremely small as compared with the related art, not only a heat exchanger having a large capacity can be manufactured extremely easily, but also the manufactured product can be manufactured from the welding points. There is little possibility that a defect such as leakage of the refrigerant will occur, and it has excellent operational effects.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view showing a state in which fins are mounted on a refrigerant pipe, FIG. 2 is a perspective view showing a state in which a heat exchange section is assembled in a meandering shape, and FIG. FIG. 4 is a perspective view showing a state where the heat exchange group is assembled, FIG. 4 is a perspective view showing a state where a refrigerant pipe is connected as one flow path, FIG. 5 is a side view of the manufactured heat exchanger, and FIG. FIG. 7 is a plan view of a conventional product. DESCRIPTION OF SYMBOLS 1 is a refrigerant pipe, 2 is a fin, 3 is a U-shaped bend pipe, 4 is a heat exchange part, 5 is a bend part, and 6 is a heat exchange group.

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Claims (1)

(57) [Claims] 1. A heat exchange section is formed by mounting a large number of fins in parallel on two long refrigerant pipes at regular intervals, and a large number of heat exchange sections are continuously formed to heat the refrigerant pipe. Bend portions are formed between the exchange portions, and the heat exchange portions are arranged in a meandering shape by bending at the bend portions to form a plurality of heat exchange groups, and further, the two refrigerants connecting each heat exchange group. One of the bends of the pipes is cut and the other is bent to overlap the heat exchange groups, and the cut portions of the bends are welded so that the two refrigerant pipes form one flow path. A method for manufacturing a heat exchanger, comprising coupling.