JPH03230834A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To easily join a tube for a heat exchanger and the partition wall of a header tank by bending a tube forming plate punched at four corners, lapping partition wall allowance parts at the central part, partitioning a space, cutting down part of the center of each base end and bringing it into contact with the end of each partition wall to form the tube for the heat exchanger. CONSTITUTION:The partition wall allowance parts 23 at both ends are bent to the center so that they crop something to lap the partition wall allowance parts over each other and when the wrapped spaces are partitioned by these partition wall allowance parts, a U-turn part of a passage is formed at the tip part 6 by the punched parts at both ends in the width direction. On the base end parts 4, too, the ends of the partition wall 7 are located by the punched parts on both ends in the width direction on this side of the base end of the tube. When part of the center of the base end of the tube forming plate 22 is cut down and brought into contact with the base end of this partition wall, a flat surface joined with the partition wall 15 of the header tank can be formed without requiring a strict dimensional accuracy. In this way, joining with the partition wall can be performed easily and securely by brazing.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to the manufacture of heat exchangers, particularly single-tank type heat exchangers in which a header tank is connected to one side of tubes arranged alternately with corrugated fins. Regarding the method.

(Prior art) In a single-tank heat exchanger, heat exchange medium flows from the header tank connected to the base end of the tube toward the tip, and the heat exchange medium makes a U-turn at the tube tip. It is designed to return to the header tank. For this reason, a U-turn portion and a partition wall are formed in the tube so as to form a flow path through which the supplied heat exchange medium makes a U-turn and returns.

As a tube having such a partition wall, for example, as disclosed in Japanese Utility Model Application No. 61-131268,
A method is disclosed for simultaneously and integrally forming the aforementioned partition walls by extrusion molding.

Furthermore, Japanese Utility Model Application Publication No. 54-90750 discloses a configuration in which a tube is formed by bending two plates, and the edges are overlapped to form a partition wall that divides the space inside the tube into two. There is.

(Problem to be Solved by the Invention) However, in the former extrusion molded tube, a U-turn portion of the passage is not formed, so it is necessary to cut a part of the partition wall to create this U-turn portion, which increases the processing man-hours. There was a problem in that the amount increased significantly. Also,
When connecting the proximal end of the tube to the header tank,
In order to prevent leakage of the heat exchange medium, the partition wall of the header tank must be joined to the partition wall of the tube without any gaps, but this requires strict dimensional accuracy. These inconveniences are due to the fact that each required part cannot be molded at the same time by extrusion molding.
Even in the case of the latter conventional technique, since the partition wall of the tube was simply made by bending a single plate, it had the same problems as in the case of extrusion molding.

Therefore, in this invention, the above-mentioned disadvantages are solved, and -
To provide a method for manufacturing a heat exchanger, which can form a U-turn part at the same time as bending a single plate when forming a tube using a single plate, and can easily and reliably join the partition wall of a header tank. is the issue.

(Means for Solving the Problems) However, the gist of this invention is to provide fins and
tubes arranged alternately with the fins; a partition dividing the inside of the tube except for the distal end of the tube; a closing member for closing the open end of the distal end of the tube; and a closing member at the proximal end of the tube. In the method for manufacturing a heat exchanger having a connected header tank, the tube is formed by forming partition wall margins at both ends in the width direction of a rectangular tube forming plate with four corners punched out, and forming partition wall margins at the center of the tube. A part of the tube forming plate is bent at the proximal end of the tube so as to come into contact with the partition, forming a flat part at the proximal end of the tube. ,
The proximal end of the tube is assembled so that the partition plate of the header tank comes into contact with the flat part, the distal end of the tube is closed with a closing member, and the fin is placed between adjacent tubes, and then the whole The process consists of brazing in a furnace.

(Function) Therefore, if the partition wall margins at both ends are folded so as to wrap toward the center, the partition wall margins are overlapped, and the enclosed space is divided by the partition wall margins, the tip portion can be The cut-out portion forms a U-turn in the passageway. Also, at the proximal end, the end of the partition wall is located in front of the proximal end of the tube due to the die-cut parts at both ends in the width direction, so a part of the center of the proximal end of the tube forming plate is placed at the proximal end of the partition wall. If it is cut down and abutted, a flat surface to which the partition wall of the header tank will be joined can be formed without requiring strict dimensional accuracy. Therefore, easy and reliable brazing can be obtained and the above object can be achieved.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, a heat exchanger l is used, for example, as a heater core of an automobile air conditioner, and has tubes 2 and corrugated fins 3 stacked alternately in multiple stages. The proximal end 4 is connected to the header tank 5, and in this embodiment, the distal end 6 extends downward.

The tube 2 is formed into a hollow flat shape,
A partition wall 7 is formed approximately along the extension direction of the shaft. This partition wall 7 extends from the base end of the header tank 5 to the tip end 6.
is formed toward the front of the tip 6.
Nearby, a U-shaped passage 8 is formed in which the heat exchange medium flowing in the tube 2 makes a U-turn.

That is, as shown in FIG.
The nearer side portion is partitioned by the partition wall 7 in the flat horizontal direction, forming an outgoing flow path 9 and a return flow path 10. Further, the distal end 6 of the tube 2 is closed by a closing member 11, and a branch passage 9 and a return passage 1 are provided near the distal end as shown in FIG.
A U-turn portion 12 that communicates with 0 is formed.

The base end 4 of the tube 2 is provided with a flat part 13 that is formed following the partition wall 7 of the tube 2. A partition wall 15 that partitions the interior of the header tank 5 into two is brought into contact with the flat portion 13 of the end portion 4, and the end portion 4 is fixed by brazing in this state. As a result, the opening 9a at the proximal end of the branch flow path 9 and the return flow path IO of the tube 2
.

9b are connected to an inflow path 16 and an outflow path 17, respectively, which will be described below.

The header tank 5 has a tank peripheral wall 18 having a substantially U-shaped cross section.
and an end plate 14 having a flat surface shape,
The substantially center of the header tank 5 in its extending direction (tube stacking direction) is divided by a partition wall 15 into an inflow path 16 and an outflow path 17 for the heat exchange medium. An inlet vibrator 19 into which the heat exchange medium flows into the inflow path 16 is connected to an outflow path 17.
An outlet vibrator 20 from which the heat exchange medium flows out is connected to each.

The end plate 14 is provided with a plurality of connecting holes 21 into which the proximal end portion 4 of the tube 2 is fitted, and the connecting holes 21 and the partition wall 15 allow the tube 2 to be positioned in the header tank 5. This can be achieved by inserting it into the connection hole 21.

Thus, the heat exchange medium flowing in from the inlet vibrator 19 is divided into the branch channels 9 of each tube 2 via the inflow channel 16, flows into the branch channel 9 of each tube 2, makes a U-turn at the distal end portion 6 of each tube 2, and returns to the flow channel. 10 to the outflow path 17,
It is collected here and discharged from the exit vibrator 20.

The tube 2 described above is constituted by a rectangular tube forming plate 22 made of, for example, aluminum or an alloy thereof as shown in FIG. Partition wall margins 23.23 are formed at both ends of the partition wall. Tube forming plate 22
On both sides of the zero base end, an L-shape is cut out so that a folding margin 24° 24 is formed with a width larger than the width of the partition wall margin 23 and following the partition wall margin 23 (indicated by diagonal lines). Further, on both sides of the tip of the tube forming plate 22, a die is cut out in the longitudinal direction of the tube forming plate 22 with a width that is slightly larger than the width of the partition wall margin portion 23 (indicated by diagonal lines). .25 is formed following the partition wall margin 23.23. Further, a flat portion forming margin 26 is formed with a notch at the center of the base end of the tube forming plate 22.

In this embodiment, the width of the above-mentioned folding margin 24 is made equal to the width j21 of the partition wall margin 23, and the width 12 of the die-cut portion on both sides of the base end is equal to the width 11 of the partition wall margin 23 and the flat portion. Width I of forming allowance 26! , half the length of 3! , /2.

Also, the length from the base end of the tube forming plate 22 to the partition wall margin 23! , is approximately equal to the length of the notch of the flat portion forming margin 26, and the width of the partition wall margin 23! ,
is also equal to

To make the tube 2 using this tube forming plate 22, first, as shown in FIG.
24 at a right angle toward you, and at the same time, bend the partition wall margin portions 23 and 23 toward you at a right angle as shown in FIG. Then, as shown in FIG. 9, roll the partition wall margins 23.23 toward you from both sides so that the partition wall margins 23.23 are back to back at the center of the tube forming plate 22, as shown in FIG. The partition walls 23 and 23 are placed one on top of the other, and the sides of the partition wall margins 23 and 23 are brought into contact with the center of the tube forming plate 22.

As a result, the partition wall margin 23.2 of the tube forming plate 22
3 is formed from the center, and both reciprocating flow paths 9 and 10 are formed on both sides of the partition wall 7, and the cut-out portions on both sides of the tip of the tube forming plate 22 form a partition wall 7 that separates the space surrounded by U. A turn portion 12 is formed. In this state, as shown in FIG. 11, the folding margin 24.2 is
When the flat portion 26 is bent and brought into contact with the tube 2 from above, a flat portion 13 extending in the thickness direction of the tube 2 is formed in front of the open ends of the reciprocating channels 9 and 10. .

Thereafter, the base end 4 of the tube 2 is aligned with the connection hole 21 of the end plate 14 as shown in FIG. Push in until it makes contact. Then, the fin 3 is inserted between the tubes 2, and the opening at the tip of the tube 2 is closed by applying the closing member 11,
The heat exchanger is completed by fixing the whole thing with a jig and brazing it in a furnace.

Therefore, in the manufacturing process of the heat exchanger, the U-turn portion 12 of the tube 2 is formed at the same time as the tube forming plate 22 is assembled, and the partition wall 15 of the header tank 5 is formed subsequent to the partition wall 7 of the tube 2. Since the width of the flat part 13 is sufficiently larger than the thickness of the partition wall 15, a reliable contact state can be expected even if the position of the partition wall 15 is slightly shifted. Furthermore, since the contact area of the partition wall 15 is a flat surface, brazing also has the advantage of improving the soldering properties.

13 and 14, another embodiment of the tube 2 is shown, and the difference from the above embodiment is that the die-cutting on both sides of the tip of the tube forming plate 22 is performed at the partition wall margin 23.
23 is cut out at multiple locations leaving brazing allowances 25 in the width direction.

In this way, after the tube is formed, a plurality of struts 27 will be formed at the joint portion of the tip end 6 of the tube 2, and the strength can be increased by that amount while forming the U-turn portion 12. . For the same purpose, holes 28 may be punched and formed on both sides of the tip of the tube forming plate 22, as shown in FIGS. 15 and 16.

(Effects of the Invention) As described above, according to the present invention, the tube forming plate with the four corners cut out is bent and the partition wall margins are overlapped in the center, thereby dividing the enclosed space into two and , cut down a part of the center of the base end of the tube forming plate and bring it into contact with the end of the partition wall, thereby forming the tube of the heat exchanger. In addition, a flat surface is formed on the base end side, and the partition wall of the header tank is brought into contact with this flat surface, so that the connection with the partition wall of the header tank can be easily and reliably performed. .

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of the heat exchanger according to the present invention, Fig. 2 is a partially cutaway side view of the heat exchanger in the same as above, and Fig. 3 is a connection between the tube and header tank in the same as above. A sectional view taken along the line ■-■ in Fig. 2 showing the state, Fig. 4 a sectional view taken along the line IV-IV in Fig. 2, and Fig. 5 a sectional view taken along the line v-V in Fig. 2. 6 is a plan view of the main part showing the tube forming plate of the tube used in the above, and FIGS. 7 to 11 are main parts illustrating the assembly process of the tube forming plate in the above. FIG. 12 is a perspective view illustrating the process of attaching the header tank and the tube, and FIG. 13 is a plan view of the main part of a tube forming plate showing another embodiment of the tube of the heat exchanger according to the present invention. 14. FIG. 3 is a perspective view of the main part of the tube formed by the tube forming plate in the same as above, and FIG. 15 is a plan view of the main part of the tube forming plate showing still another embodiment of the heat exchanger according to the present invention. FIG. 16 is a partially cutaway perspective view of a main part of the tube formed by the tube forming plate in the same as above. ■... Heat exchanger, 2... Tube, 3... Fin, 4... Base end, 5... Header tank, 6... Tip, 7... Partition wall, 11... ...Closing member, 13...
Flat portion, 15... Partition wall, 22... Tube forming plate, 23... Partition wall margin.

Claims (1)

[Scope of Claims] Fins, tubes arranged alternately with the fins, a partition wall that divides the inside of the tube except for the distal end of the tube, and a closing member that closes the open end of the distal end of the tube. and a header tank connected to the proximal end of the tube, wherein the tube has partition walls at both ends in the width direction of a rectangular tube forming plate with four corners punched out. A partition wall is formed by bending the partition wall margins so as to overlap each other at the center to form a partition wall that partitions the enclosed space into two parts, and a part of the tube forming plate is brought into contact with the partition wall at the base end of the tube. The proximal end of the tube is assembled so that the partition plate of the header tank comes into contact with the flat part, and the distal end of the tube is closed with a closing member, and there is no space between adjacent tubes. 1. A method for manufacturing a heat exchanger, comprising: arranging the fins on the fins, and then brazing the entire body in a furnace.