JPH0123217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a heat exchanger with plate-like fins used in cooling systems such as refrigerators and air conditioners.

Construction of conventional examples and their problems A method for manufacturing a heat exchanger with plate-shaped fins that improves the leading edge effect of the boundary layer by providing a predetermined interval in the direction of air flow, that is, in the row direction of the fins, is known, for example, as proposed by Tokko Sho. It is well known as disclosed in Japanese Patent No. 56-29606 and the like. A method of manufacturing this heat exchanger with plate-like fins will be explained with reference to FIGS. 1 to 3. The plate-like fin 1 has two pipe mounting holes 3 arranged side by side in the center into which refrigerant pipes 2 are inserted, and a fin positioning tool 5 having a fin insertion groove 8 provided at a predetermined interval is inserted into a predetermined position. A predetermined number of refrigerant pipes are inserted into each groove 8 and arranged in parallel with intervals 6 and 7 and an interval 4 for bending the refrigerant pipe 2. Next, the refrigerant pipe 2 is inserted into the pipe attachment hole 3 of the plate-like fin 1, and then the refrigerant pipe 2
The plate-like fin 1 and the refrigerant pipe 2 are tightly fixed by expanding the pipe. Thereafter, the fin positioning tool 5 is removed, and the bent portion 9 of the refrigerant pipe 2 is bent into a substantially arc shape as shown in FIG.

According to the above-described manufacturing method, the refrigerant pipes 2 inevitably have a grid pattern in each row direction. It is known that arranging the refrigerant pipes in a comb pattern is better than arranging the refrigerant pipes in terms of heat exchanger performance. The disadvantage was that it was not possible to obtain

Therefore, the present applicant has provided a method for manufacturing a heat exchanger in which the refrigerant pipes are arranged in a bird-like arrangement, which has better performance than the heat exchanger obtained by the conventional manufacturing method as described above.

The method for manufacturing such a heat exchanger with plate-shaped fins is described in the fourth embodiment.
This will be explained with reference to FIGS.

As shown in FIG. 4, the plate-like fins 10 are provided with pipe attachment holes 12 at positions offset to one side from the center, and as shown in FIG. After reversing the direction of the fins 10 and arranging the pipe mounting holes 12 in a straight line, inserting and expanding the refrigerant pipes 11 into the pipe mounting holes 12 and tightly fixing them to the plate-shaped fins 10, as shown in FIG. As shown in FIG. 2, the bent portions 13 and 14 of the refrigerant pipe 11 are bent meanderingly in the direction of each row so as to form a checkerboard arrangement.

Thereafter, the refrigerant pipe 11 is twisted using a twisting device or the like, and the refrigerant pipe 11 is twisted as shown in FIG.
are arranged in a bird-like manner in each column direction.

However, with this bending method, serpentine bending,
Since the twisting process is performed in a separate device and in a separate process, a large number of processing steps are required, which is not preferable from the viewpoint of equipment and processing time.

OBJECT OF THE INVENTION In view of the above, the present invention has been made to provide a method for manufacturing a heat exchanger that is inexpensive to manufacture.

Structure of the Invention That is, the present invention has plate-like fins in which pipe mounting holes are formed at positions offset to one side from the center, and the direction of the plate-like fins is reversed for each row so that the pipe mounting holes are directly above the center. After arranging the refrigerant pipes side by side, inserting them into the pipe mounting holes, expanding the pipes and tightly fixing them to the plate-like fins, bend the refrigerant pipes in a meandering manner, and at the same time, twist the refrigerant pipes to arrange the refrigerant pipes in the direction of each row. On the other hand, this is a method for manufacturing a heat exchanger with plate-shaped fins shaped like a dried bird.

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

First, the first step is the step of drilling the pipe attachment holes 12 in the plate-like fins 10 at positions offset to one side from the center, as shown in FIG. 4, and then the second step is to drill the plate-like fins in each row. a step of reversing the direction of the plate-like fins 10 and arranging the pipe attachment holes 12 in a straight line; and a third step of reversing the direction of the plate-like fins 10 and arranging the pipe attachment holes 12 in a straight line.
The steps up to the step shown in FIG. 5, which shows the step of inserting the refrigerant pipe 11 into the refrigerant pipe 11, expanding the pipe, and bringing it into close contact with the plate-like fin 10, are the same.

Then, the bent portions 13 and 14 of the refrigerant pipe 11
As shown in FIGS. 8 to 12, they are bent meanderingly and at the same time are twisted to form a bird-like arrangement.

Next, the bending/twisting device will be explained. 1
5 is a semicircular die, which has a large diameter part 15a and a small diameter part 1.
5b, the refrigerant pipe 11 is guided by the circular diameter surface of the small diameter part 15b, and the large diameter part 15a
An inclined taper guide 15c is provided on the lower surface of the refrigerant pipe 11 for twisting the refrigerant pipe 11.
have. Above the dice 15 is a dice vertical drive device 16 that raises and lowers the dice 15.
A center shaft 18 connected to the rotation drive unit 17 is arranged at the lower part thereof, and is connected to the center shaft 18 when the die 15 is lowered. 19 is the small diameter part 1 of the die 15
A bending head disposed opposite to the refrigerant pipe 5b has a gripping groove 19a for gripping the refrigerant pipe 11. The upper end of the bending head 19 is guided by a bending head guide 21 via a spring 20 so as to slide along the tapered guide 15c. This bending head guide 21 is supported by a bending head support base 22 that rotates around a central axis 18, and is moved forward and backward by a front and rear slide drive unit 23.
Reference numerals 24 and 25 denote refrigerant pipe guides disposed facing the die 15, of which the refrigerant pipe guide 25 is moved up and down by a refrigerant pipe vertical drive section 26 and can rotate along a refrigerant pipe guide rail 27. Note that a refrigerant pipe vertical drive section is also disposed in the refrigerant pipe guide 24, but is not shown here.
The refrigerant pipe vertical drive section 26 is connected to the rotation drive section 17 via a refrigerant pipe guide rotation drive section 28 .

Next, the bending and twisting operations performed by the above-mentioned device will be explained.

First, a molded body in which a refrigerant pipe 11 and a plate-like fin 10 are brought into close contact with each other as shown in FIG.
Set it so that it is in between. The refrigerant pipe guide vertical drive section 26 moves the refrigerant pipe guide 24,
25 to guide the bent portion 13 of the refrigerant pipe 11. Next, the semicircular die 15 is lowered by the die vertical drive unit 16 to dock with the central shaft 18. Next, the bending part 13 of the refrigerant pipe is clamped by the groove 19a of the bending head 19, and the bending head support 22 is advanced by the front and rear slide drive part 23 so as to contact the small diameter part 15b of the semicircular die 15. This completes the preparation before bending.

Next, the bending head 19 is moved by the rotary drive unit 17.
As the refrigerant pipe 11 is rotated 180 degrees, the bent portion 13 of the refrigerant pipe 11 is guided by the refrigerant pipe guide 25 and the diagonal taper guide 1 of the semicircular die 15.
5c, the bending head 19 is lowered, so that the bending head 19 is processed while being twisted. At this time, the refrigerant pipe guide 25 rotates from being along the refrigerant pipe guide rail 27. After rotating the refrigerant pipe guide 25 by 180 degrees, move the refrigerant pipe vertical drive unit 26 to the refrigerant pipe guide 25.
The refrigerant pipe guide rotation drive unit 2
8 to return it to the normal position. bending head 1
9 is also moved backward by the front and rear slide drive unit 23 and returned to the home position by the rotation drive unit 17. Bending head 19
The bending head 19 is raised by the spring 20 at the same time as the bending head 19 is moved backward by the front and rear slide drive unit 24. The refrigerant pipe guide 24 is also lowered by the refrigerant pipe vertical drive unit to complete one step of bending. When performing the next bending, the refrigerant pipe 11 is reversed and slid by each row, and the above steps are repeated until the bending is completed.

In this way, the bending process and the twisting process are completed at the same time.

Effects of the Invention As is clear from the above description, the present invention provides a heat exchanger with plate-like fins in which the refrigerant pipes are arranged in a porcupine shape, since the refrigerant pipes can be bent in a meandering manner and twisted at the same time. It can be provided at a low cost by significantly reducing the number of processing steps.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and side view of a heat exchanger in the process of being manufactured by a conventional manufacturing method, Figures 3a and b are perspective views and side views of a heat exchanger manufactured by the same method, and Figure 4
The figure is a front view of plate-like fins used in a bird-shaped heat exchanger, and Figure 5 is a plan view of the heat exchanger in the process of being manufactured.
FIG. 6 is a perspective view of the heat exchanger in progress, FIG. 7 is a perspective view of the completed heat exchanger, and FIG. 8 is a perspective view of the heat exchanger in progress by the manufacturing method of an embodiment of the present invention. Figures 9 to 12 are explanatory diagrams at each step of the same manufacturing process, with Figure 9 being a perspective view of the entire assembly when set, Figure 10 being a cross-sectional view of the main parts when being set, and Figure 11 showing the process in progress. A plan view of the main parts, and FIG. 12 shows a perspective view of the entire structure when completed. 10... Plate fin, 11... Refrigerant pipe, 1
2... Pipe mounting hole, 13, 14... Refrigerant pipe bent portion.

Claims (1)

[Claims] 1 Plate-shaped fins with two pipe mounting holes drilled at positions offset to one side from the center are arranged by inverting the plate-shaped fins in each row so that the pipe mounting holes are aligned in a straight line, and refrigerant pipes are After inserting the refrigerant into the pipe mounting hole, expanding the pipe, and tightly fixing it to the plate-like fins, bend the refrigerant pipe meanderingly and at the same time twist the refrigerant pipe to arrange the refrigerant pipes in the direction of each row of the plate-like fins. A method for manufacturing a heat exchanger with plate-shaped fins that is shaped like a dried bird.