JPS5910428A - Manufacture of heat exchanger equipped with plate-shaped fin - Google Patents

Abstract

PURPOSE:To improve operating efficiency remarkably, by bending the open end of a pipe made longer, and welding the open end to that of a pipe made shorter, in a titled manufacture which connects the open ends of plural pipes made to penetrate fins. CONSTITUTION:Small pieces of fins 4 are arranged at wide distances L1, and after spacing a bending distance L2, the following fins 4 are arranged at narrow distances L3, thus the fins 4 are arranged in series to form a prescribed arrangement by repeating said work hereafter. Next, heat exchanging pipes 5, 6 are made to penetrate the fins 4, and the pipe 5, 6 are tightly fixed to the fins 4 by inserting an expanding device into the pipes 5, 6 and expanding them. Thereafter, the pipes 5, 6 are cut to have different lengths respectively, and are bent at the fin-less part to form meandering shapes as shown by the figure. Next, the side of an open end 5a of each longer pipe 5 is bent into an arc-shape to be opposite to an open end 6a of the other shorter pipe 6, and both open ends 5a, 6a are welded together to communicate them each other. Thus, both the number of parts and the number of welding points are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat exchanger with plate-like fins used in refrigerators, room air conditioners, etc.

A conventional manufacturing method of this type of heat exchanger will be explained with reference to FIGS. 1 to 6. 1, small piece twin 1 (f - wide spacing l)
+) 1 [bell. Next, the fins are spaced apart by the bending interval, and the fins are arranged at even narrower intervals l, se, and this process is repeated to arrange the fins in a predetermined arrangement. Heat exchange pipes 2 and 3 are all connected to the small piece twin 1 and placed in the condition shown in Figure 1. After that,
The parts of the pipes 2 and 6 without the fins 1 are bent to form a meandering shape as shown in Fig. 2. Next, the connecting pipe 7 is connected to the open ends 2a and 3ai of the heat exchange pipes 2 and 5 as shown in FIG.
The method was to apply it so that it communicated, and then weld the entire contact area.

According to this method of manufacturing a heat exchanger, communication is made via the joint pipe 4, which not only has poor workability but also causes high costs.

The present invention has been made to completely eliminate such defects. That is, in a method of manufacturing a heat exchanger with plate-like fins, in which a plurality of pipes are passed through a twin and the open ends of the pipes are connected, the pipes are inserted into the fins and expanded, and one of the open ends of the pipes is inserted into the fins and expanded. The opening end of the longer end is bent into an arc shape to face the other open end, and both open ends are welded to connect the pipe.

The F1 invention will now be explained with reference to FIGS. 4 to 6.

First, the small pieces of fins 4 are arranged with a wide interval L1, then bent 1111 apart, 11 apart, and further arranged with a narrower interval of 1''3, and then this is repeated to arrange them in a predetermined twin arrangement. Next, the heat exchanger vibes 5 and 6 are passed through the small piece fins 4. In this state, a tube expansion device (not shown) is installed inside the heat exchange pipes 5 and 6.
The heat exchange pipes 5 and 6 are expanded all the way through and tightly fixed to the fins 4. During this pipe expansion, the heat exchange pipes 5 and 6 are made to protrude beyond the fins 4 by an amount corresponding to the length of the heat exchange pipes 5 and 6 contracted in their longitudinal dimensions. After that, the vibrator 5/B is cut to the length of the whole body and formed into the state shown in FIG. 4.

From this state, the parts of the vibrators 5 and 6 without the fins 4 are bent and formed into a meandering shape as shown in FIG. Next, the open end 5a side of the long pipe 5 is bent into an arc shape to face the open end 6a of the other short pipe B, and both open ends 5a and 6 are bent.
a4 As shown in Fig. 4, connect the pipes 5 and 6 to communicate with each other.

According to this method of manufacturing a heat exchanger, instead of connecting the vibrators 5 and 6 with the conventional joint pipe casing E~, a part of the pipe 5 is used, so the number of parts can be reduced. . In addition, it is only necessary to bend the five long pipes so as to face the open ends of the short pipes B, and weld all of them at only one location, which greatly facilitates the welding work. Therefore, it is possible to provide an entire method for manufacturing a plate-shaped fin heat exchanger that can significantly improve work efficiency and reduce cost.

[Brief explanation of drawings]

1 to 6 are perspective views of a conventional heat exchanger during each manufacturing process, and FIGS. 4 to 6 are perspective views of a heat exchanger of the present invention during each manufacturing process. 4...Fin, 5e6...Heat exchange pipe, 5a16
a...Open end.

Claims (1)

[Claims] 1. Pass multiple pipes (5) and (6) through the fin (4), and open the open ends (5a) of the pipes (5) and (6).
)・(6a)k In the manufacturing method of a heat exchanger with plate-shaped fins that are connected, the pipes (5) and (6) are inserted and expanded into the fins (4), and the pipes (5) and (6) are inserted and expanded into the fins (4).
), one of the opening ends (5a) is made longer and the other (6a) is made shorter, the longer opening end (5a) is bent into an arc shape, the other opening end (6a) is placed opposite to each other, and both openings are Edge (5a)
・(6alr welding and connecting the pipes (5) and (6)r) A method for manufacturing a heat exchanger with plate-shaped fins.