JPS59225834A - Production of plate-finned heat exchanger - Google Patents

Abstract

PURPOSE:To obtain inexpensively a product having good performance by upsetting and disposing the plate fins each provided with two pipe holes in deviated positions in each row unit, passing refrigerant pipes into the respective holes and fitting tightly and fixing the pipes to the fins then subjecting the fins and pipes to spiral bending and twisting thereby forming the same into a zigzag shape. CONSTITUTION:Fins 10 each punched with two holes 12 in the positions deviated from the center are upset and arranged in each row unit. Pipes 11 are fitted tightly and fixed by expansion onto the holes 12 and the bent parts 13 of the pipes are set between guides 24 and 25 and are clamped to the small diameter part 15b of a die 15 by the groove 19a of a bending head 10. While the head 19 is rotated 180 deg. by a rotative driving part 17, the head 19 is descended by a diagonal tapered guide 15c of the die 15 and at the same time a guide 25 is rotated along a rail 27 to apply bend and twist to the bent parts 13, by which a finned heat exchanger arranged zigzag with the pipes 11 is obtd. The performance of the titled heat exchanger is thus improved and the man-hour for working is considerably reduced.

Description

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

Conventional structure and problems There is a method for manufacturing a heat exchanger with plate-shaped fins that improves the boundary layer leading edge effect by providing a predetermined 2-knee interval in the air flow direction, that is, in the row direction of the fins. , for example, Special Public Interest Publication No. 56-2
This is well known as disclosed in Japanese Patent No. 9606 and the like. A method of manufacturing this heat exchanger with plate-like fins will be explained with reference to FIGS. 1 to 3. Two pipe mounting holes 3 into which the refrigerant pipes 2 are inserted are arranged in the center of the plate-like fin 1, and the fin positioning tool 5 has grooves 8 for inserting the fins at predetermined intervals. spacing 6, 7 and refrigerant pipe 2
A predetermined number of sheets are inserted into the joining groove 8 and arranged in parallel with an interval 4 for bending. Next, the refrigerant pipe 2 is inserted into the pipe attachment hole 3 of the plate-shaped fin 1, and later the refrigerant pipe 2 is expanded to tightly fix the plate-shaped fin 1 and the refrigerant pipe 2. After this,
The fin positioning tool 6 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 a staggered arrangement of refrigerant pipes is better than a staggered arrangement in terms of heat exchanger performance. This method has the disadvantage that a staggered arrangement of pipes cannot be obtained.

Therefore, the present applicant provides a method for manufacturing a heat exchanger in which the refrigerant pipes are arranged in a staggered manner, which has better performance than the heat exchanger obtained by the conventional manufacturing method as described above.

A method of manufacturing such a heat exchanger with plate-shaped fins is shown in FIGS. 4 to 7.
This will be explained using figures.

As shown in FIG. 4, the plate-like fin 10 is provided with a pipe attachment hole 12 at a position offset to one side from the center, and as shown in FIG. Fin 1
0 is reversed, the pipe mounting holes 12 are arranged in a straight line, and the refrigerant pipe 11 is inserted into the pipe mounting hole 12, expanded, and tightly fixed to the plate-like fin 10, and then
As shown in the figure, the bent portions 13 and 14 of the refrigerant pipe 11 are bent meanderingly in the direction of each row so that they are arranged in a grid pattern.

Thereafter, the refrigerant pipes 11 are twisted using a twisting device or the like, so that the refrigerant pipes 11 are arranged in a staggered manner in each row direction, as shown in FIG.

However, this bending method requires a large number of processing steps because meandering bending and twisting are performed using separate equipment and separate processes, which is not preferable from the viewpoint of equipment and processing time.

OBJECT OF THE INVENTION In view of the above points, the present invention has been made to provide a method of manufacturing a heat exchanger at low manufacturing cost.

Structure of the Invention That is, the present invention has plate-like fins with pipe mounting holes drilled 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 aligned in a straight line. After arranging the refrigerant pipes into the pipe mounting holes, expanding them and tightly fixing them to the plate fins, bend the refrigerant pipes in a meandering manner, and at the same time twist the refrigerant pipes to align the refrigerant pipes in the direction of each row. This is a method for manufacturing a heat exchanger with staggered plate-like fins.

Description of examples 5 pages 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 above-mentioned plate-like fins in each row. Reverse the direction of the plate-like fin 1o and insert the pipe mounting hole 12.
The process of arranging the refrigerant pipes in a straight line and the process of FIG. 6, which is the tertiary process of inserting the refrigerant pipe 11 into the pipe attachment hole 12, expanding it, and bringing it into close contact with the plate-shaped fins 10, are the same. .

Next, the bent portions 13 and 14 of the refrigerant pipe 11 are meanderingly bent and simultaneously twisted to form a staggered arrangement, as shown in FIGS. 8 to 12.

Next, the bending/twisting device will be explained.

16 is a semicircular die, which has a large diameter part 15a and a small diameter part 15b.
The refrigerant pipe 11'f is guided by the circular arc surface of the small diameter part 15b, and the lower surface of the large diameter part 15a is provided with an inclined tenor for twisting the refrigerant pipe 11 when bending. It has 6 pages of guide 15c. A die vertical drive device 16 for raising and lowering the die 15 is disposed at the top of the die 15, and a central shaft 18 connected to a rotary drive unit 17 is disposed at the bottom. Combine with. A bending rod 19 is arranged opposite to the small diameter portion 15b of the die 16, and has a gripping groove 19a for gripping the refrigerant pipe 11. The bending head 19 is guided by a bending head guide 21 via a spring 20 so that its upper end surface slides along the taper guide 15C.

This bending head guide 21 is supported by a bending head support stand 22 that rotates around a central axis 1, and is moved forward and backward by a front and back slide drive unit 23.

Reference numerals 24 and 25 denote refrigerant pipe guides disposed opposite to 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 refrigerant pipe guide rails 27. A refrigerant pipe lower drive unit 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.

The refrigerant pipe 11 and the plate-like fins 1 as shown in FIG.
A molded body in which 0 and 0 are in close contact is prepared and the refrigerant pipe bent part
3 and the refrigerant pipe guides 24 and 25. The refrigerant pipe guide vertical drive section 26 raises the refrigerant pipe guides 24 and 25 to guide the bent portion 13 of the refrigerant pipe 11. Next, the semicircular die 15 is lowered by the die lower drive unit 16 and docked with the center shaft 18. Next, the refrigerant pipe bent portion 13 is clamped by the groove 19a of the bending head 19, and the semicircular die 1 is
Bend the head support stand 22 so as to hit the small diameter part 16b of 5.
is moved forward by the front and rear slide drive unit 23. This completes the preparation before bending.

Next, when the bending head 19 is rotated 180 degrees by the rotary drive unit 17, the bending portion 13 of the refrigerant pipe 11 is bent by the semicircular die 16 while being guided by the refrigerant pipe guide 26.
The bending head 19 is bent by the diagonal taper guide 15c.
As it descends, twists are added as it is processed. At this time, the refrigerant pipe guide 25 rotates along the refrigerant pipe guide rail 27. After the 180 degree rotation, the refrigerant pipe guide 25 is lowered by the refrigerant pipe vertical drive section 26 and returned to the home position by the refrigerant pipe guide rotation drive section 28. To bend.

The door 19 is also moved backward by the front and rear slide drive unit 23 and returned to its home position by the rotation drive unit 17. At the same time, the bending head 19 is moved backward by the front and rear slide drive unit 24.
is raised by the spring 20.

The same applies to the refrigerant pipe guide 24 (it is 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 explanation on pages 9 and above, the present invention provides a heat exchanger with plate-like fins in which the refrigerant pipes are arranged in a staggered manner, since the refrigerant pipes can be bent in a meandering manner and twisted at the same time. can be provided at low cost with a significant reduction in processing man-hours.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and a side view of a heat exchanger in the process of being manufactured by a conventional manufacturing method, and Figures 3 (a) and (b) are a perspective view and a side view of a heat exchanger manufactured by the same method. Figure 4 is a front view of plate-like fins used in a staggered heat exchanger, Figure 6 is a plan view of the heat exchanger in progress, Figure 6 is a perspective view of the heat exchanger in progress, and Figure 7. is a perspective view of the completed heat exchanger,
Fig. 8 is a perspective view of a heat exchanger in the process of being manufactured by the manufacturing method according to an embodiment of the present invention, Figs. Similarly, FIG. 10 is a sectional view of the main part when set, FIG. 11 is a plan view of the main part during processing, and FIG. 12 is a perspective view of the whole when completed. 10... Plate fin, 11... Refrigerant pipe, 121o base ζ... Pipe mounting hole, 13.14... Refrigerant pipe bent portion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure / △ 3 Figures (Li (b) Figure 4 Figure 5 Figure 6 Figure 0 Figure 7 4 Figure 9 Figure 10 Figure 5 15oL/qα /'/ 15c / 1

Claims (1)

[Claims] 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 lined up in a straight line, and the refrigerant pipes are arranged in a straight line. After inserting the pipe into the mounting hole and expanding it 1-1 and fixing it tightly to the plate fins, turn the refrigerant pipe in a meandering direction and at the same time twist the refrigerant pipe to align the refrigerant pipes in the direction of each row of the plate fins. , a method for manufacturing a heat exchanger with plate-shaped fins having a staggered shape.