JPH0330453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a plate-shaped finned heat exchanger used in a cooling system such as a refrigerator.

Structure of conventional example and its problems
This will be explained with reference to FIG. In the center of the plate-like fin 1, there are two pipe mounting holes 3 through which the refrigerant pipe 2 is inserted.
The fins are inserted into a fin positioning tool 5 which has grooves 4 for fin insertion provided at predetermined intervals. All of the plate-like fins 1 have the same shape, and first, a predetermined number (5 in this case) are inserted into the groove 4 at intervals of 6, and then the groove 4 is left open by the amount necessary to bend the refrigerant pipe 2 (in this case). 4
A predetermined number (in this case, 9 pieces) are inserted from the two grooves) at intervals of 7 for each groove 4, and after further opening the groove 4 by the amount necessary to bend the pipe, insert them at intervals for each groove 4. In this way, the plate-like fins are arranged in a straight line. Next, the refrigerant pipe 2 is inserted into the pipe attachment hole 3 of the plate-like fin 1, and the refrigerant pipe 2 is expanded by passing a tube expansion device into the refrigerant pipe 2, so that the plate-like fin 1 and the refrigerant pipe 2 are closely fixed. Thereafter, the refrigerant pipe 2 is taken out from the fin positioning tool 5, and the bent portion 8 is bent into an arc shape as shown in FIG. 1 to form the refrigerant pipe 2 into a meandering shape. Thereby, the plate-like fins 1 are arranged in a plurality of parallel rows with gaps 9 between them. According to the above manufacturing method, the fin positioning tool 5
Since the plate-like fins 1 are manufactured by being arranged in a row, the arrangement of the refrigerant pipes 2 is necessarily in a grid pattern, which improves the performance of the heat exchanger. It had the disadvantage that staggered piping, which has a large turbulence effect, could not be created.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a heat exchanger, in which plate-shaped fins are closely fixed to refrigerant pipes, and then the refrigerant pipes are bent in a meandering manner, and the refrigerant pipes are arranged in a staggered manner. do.

Structure of the Invention In order to achieve this object, the present invention deviates the pipe attachment hole of the plate-like fin, and varies the depth of insertion of the fin in the groove of the fin positioning tool into which the fin is inserted, in units of names. The refrigerant pipes are automatically arranged in a staggered arrangement by arranging the pipe mounting holes in a straight line and bending the refrigerant pipes inserted into the holes so that the upper and lower ends of the fins are on the same plane when bending the refrigerant pipes in a meandering manner. It was designed so that

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 3 to 5, numeral 10 is a plate-like fin, and two pipe mounting holes 11 are bored side by side at positions offset to one side from the center, and the pipe mounting holes 11 and the fins 10 are The side with a larger distance will be called the long end side 12, and the side with a smaller distance will be called the short end side 13. The fin positioning tool 14 is provided with two types of fin insertion grooves 15 and 16. The groove 15 is inserted with the short end 13 of the fin 10 facing downward, and the groove 16 is inserted with the long end of the fin 10 facing downward. This is the groove that you insert it into. Further, the groove portions 15 and the groove portions 16 are alternately located every 10 rows of fins, and the groove portions receive the end faces of the fins 10 in the vertical direction so that the centers of the pipe attachment holes 11 of each fin 10 are located in a straight line. The bottoms 15 and 16 are arranged at alternately shifted positions, that is, with a step difference. That is, here, the depth of the groove 15 is equal to the length of the short end 13, the depth of the groove 16 is equal to the length of the long end, and the depth of the groove 5 is 1/1/2 of the depth of the groove 16. 2
It is set to . In this way, when the fins 10 are inserted into the places where the fin positioning tools 15 and 16 are arranged, the rows in which the long ends 12 of the fins 10 are placed downward and the rows in which they are placed upward are arranged alternately. The pipe attachment holes 11 are arranged in a straight line. Next, insert the refrigerant pipe 17 into the mounting hole 11 of the fin 10, pass a tube expansion device into the pipe 17, expand the pipe 17, and connect the fin 10 and the pipe 1.
7 and are tightly fixed. After taking out the pipe in this state from the fin positioning tool 14, the pipe 17 is formed into a meandering shape by bending the bent portion 18 into an arc shape and so that the upper and lower end surfaces of the fins 10 are respectively flush with each other.

Therefore, the fins 10 are arranged in a plurality of rows in parallel with gaps 19, and the pipes 17 are arranged in a staggered manner, which has a large turbulence effect and is excellent in terms of the performance of the heat exchanger.

Effects of the Invention As is clear from the above description, the present invention provides a method in which the fin insertion groove of the fin positioning tool is alternately shifted vertically for each row of fins, and the pipe mounting hole is located at a position offset to one side from the center. Insert small pieces of plate-shaped fins with a fin at predetermined intervals so that the pipe mounting holes are lined up in a straight line, then insert the refrigerant pipe into the hole, expand it, and fix it tightly. Since the pipe is bent in a straight line, it is easy to arrange multiple rows of fins in parallel with gaps between them, and the pipe bending method involves staggered piping, which has a large turbulent flow effect that improves the performance of the heat exchanger. Easily obtained in heat exchangers.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional heat exchanger, Fig. 2 is a partial sectional view of the same heat exchanger in the middle of production, Fig. 3 is a perspective view of a heat exchanger with plate-like fins of the present invention, and Fig. 4 The figure is a plan view of the fins of the heat exchanger, and FIG. 5 is a partial cross-sectional view of the heat exchanger during manufacture. 10...Plate fin, 11...Pipe mounting hole,
14...Fin positioning tool, 15, 16...Fin insertion groove, 17...Refrigerant pipe.

Claims (1)

[Claims] 1. A fin positioning device having a number of grooves for inserting the fins at predetermined intervals, a plate-shaped fin inserted into the grooves and having a pipe mounting hole bored at a position offset to one side from the center, and a fin inserted into the pipe mounting hole. It consists of a refrigerant pipe that is bent in a serpentine shape, and the groove of the fin positioning tool has a fin insertion depth that differs for each row of plate-shaped fins, and the plate-shaped fins have their pipe mounting holes aligned in a straight line. The refrigerant pipes are inserted into the grooves by inverting each row, and the refrigerant pipes are inserted into the pipe mounting holes, and then expanded and tightly fixed to the plate-like fins, so that the upper and lower ends of the plate-like fins in each row are the same. A method for manufacturing a heat exchanger with plate-like fins, which is bent in a meandering manner so as to be flat so that refrigerant pipes are arranged in a staggered manner.