JPS6287793A - Manufacture of lamination type heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the number of parts for setting a part to an assembled product before brazing and improve the workability of setting work by a method wherein a laminated unit, in which two sheets of formed plates are retained previously by caulking under a condition that an outer fin is interposed, is employed and a plurality of the units are laminated. CONSTITUTION:Two sheets of formed plates 10 are arranged so as to be opposed in a condition that both of the opening surfaces of the formed plates 10 are kept at outsides in a direction wherein the inflated section 12 of one formed plate 10 at the side formed with a protruded rim 14 is abutted against the inflated section 12 of the other formed plate 10 at the side formed with no protruded rim14 while an outer fin 2 is interposed between the flat inflated sections 11 of both plates 10. The protruded rim 14 of one formed plate is fitted into the communicating hole 13 of the other formed plate, thereafter, the protruded rim, projected into the inflated section 12 of the other formed plate, is expanded to caulk both plates 10. Two sheets of formed plates 10 and the outer fin 2 are caulked in such a manner to obtain a laminated unit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a heat exchanger used in a car cooler evaporator, an oil cooler, etc., and particularly to a method for manufacturing a laminated heat exchanger.

BACKGROUND OF THE INVENTION This type of laminated heat exchanger uses a plurality of plate-shaped heat exchangers, each of which has a bulging tank at both ends and a flat tube section that communicates between them and has a heat exchange medium passage inside. The tube elements and the outer fins are stacked in an alternating arrangement with the tank parts of the tube elements communicating with each other through the heat exchange medium circulation holes, and the individual tube elements have the flat tube part and the tank part connected to each other. A device is known that is constructed of two molded plates each having an opening on one side and formed as a bulge.

In general, such a laminated heat exchanger is manufactured by setting each part so that the tube elements and outer fins are alternately laminated, temporarily assembling the assembly, and then brazing the parts. A method is adopted in which the whole is joined at once.

Problems to be Solved by the Invention However, in the conventional laminated heat exchanger as described above, it is difficult to temporarily fix a plurality of adjacent parts as a unit to the molded plate forming the tube element or the outer fin itself. Because a connection and holding mechanism was not formed, when setting the assembly before brazing, the individual molded plates and outer fins had to be stacked and set alternately, reducing the number of setting parts. This resulted in poor workability. It was also difficult to automate the setting work. Furthermore, during the handling process before being brazed, each part tends to be slightly misaligned, making it difficult to achieve accurate setting.

This invention was made in order to solve the above problems, and it reduces the number of parts to be set into an assembly before brazing, improves the workability of the setting work, and enables automation. The object of the present invention is to provide a method for manufacturing a laminated heat exchanger that reduces the risk of mutual misalignment and improves setting accuracy.

Means for Solving the Problems In order to achieve the above object, the present invention comprises a set of two molded plates, and a projecting edge is formed on the peripheral edge of one of the corresponding flow holes provided in these molded plates. A laminated unit is used in which two molded plates and an outer fin are temporarily fixed using this flange, and when temporarily assembling a heat exchanger, the tube element and outer fin can be easily assembled by simply laminating a plurality of these units. The feature is that the setting work is completed.

That is, the present invention has two molded plates each having an opening on one side and having a bulge with a large bulge height at both ends of a flat bulge, and a heat exchange medium circulation hole on the top surface of the bulge. A projecting edge is formed on one side of the bulge at the peripheral edge of the flow hole, and these molded plates are placed so that the top surfaces of the corresponding bulges abut each other, with the opening surfaces facing outward, and both sides. After arranging the plates facing each other with the outer fins interposed between the flat bulges, the projecting edge of one molded plate is fitted into the flow hole of the other molded plate and expanded, thereby caulking both plates together. By laminating a plurality of such units,
The plate-like tube elements having bulging tank parts at both ends of the flat tube parts and the outer fins are temporarily assembled into an assembly in which the outer fins are stacked in an alternating arrangement, and then brazing is applied to the molded plates and the outer fins to each other. The gist of the present invention is a method for manufacturing a laminated heat exchanger characterized by integrally bonding.

Embodiment Next, the structure of the present invention will be explained based on the embodiment shown in FIGS. 1 to 4.

In these figures, (1) is a plate-like tube element, (2) is an outer fin, (3) is an upper and lower side plate, (4) is an inlet header, and (4') is an outlet header.

The tube element (1) includes bulging tank portions (5) at both ends (5), and a flat tube portion (6) that communicates between them to form a heat exchange medium passage. Each tube element (1) is constituted by a pair of dish-shaped molded plates (10) (10) with an open negative side.

The forming plate (10) has a flat bulging part (11) for forming a flat tube part of the tube element (1) in the middle part, and a flat bulging part (11) for forming a tank part of the tube element at both ends of the flat bulging part (11). A bulge with a larger bulge height (12)
(12), and the bulge (12) has a plurality of heat exchange medium circulation holes (13) along the width direction of the play I. Such a molded plate (10) is manufactured by forming a flat bulge (11) and both end bulges (12) by press working, and then drilling a flow hole (13) in the bulge. . Furthermore, an annular projecting edge (14) is formed in a rising shape toward the outside at the peripheral edge of each communication hole (13) of the bulge (12) at one end. This ridge (14) is formed by two molded plates (10) (10) and an outer fin (2).
This is for forming a laminated unit (20) in which a set of corrugated fins as shown in FIG. Note that the protrusion does not necessarily have to be formed in an annular shape, and may be formed partially. Also shown in the figure (15)
is a condensation water receiving groove formed by processing the peripheral edge of the molded plate (10) into a gutter shape.

Therefore, the laminated unit (20) is manufactured as follows. That is, as shown in FIG.
0) Tsutsu! The bulge (12) on the side where (14) is formed
) and the ridge (14) on the other molded plate (10)
The flat bulges (11) of both plates (10) (10) are oriented so that the bulges (12) on the side where the plate is not formed abut against each other, with their opening surfaces facing outward, and the flat bulges (11) (H) of both plates (10) (10). They are arranged facing each other with an outer fin (2) interposed therebetween.

Next, after fitting the protrusion (14) of one molded plate into the flow hole (I3) of the other molded plate,
As shown in the figure, the protruding edge protruding into the other bulge (12) is expanded and both plates (10) (10) are caulked together. In this way, the two molded plates (TO) (10) and one outer fin (2) are temporarily fastened together with the outer fin sandwiched between both molded plates to form a laminated unit (20).

In this invention, as the outer fin (2), an aluminum corrugated fin with a louver cut and formed is used. As mentioned above, this outer fin (2) is sandwiched between both molded plates (10) (10) at the stage of laminating the unit, so it is sandwiched between the flat bulges (11) (11) of both molded plates. It is manufactured in advance to have a size that can be accommodated in the created space.

Next, a heat exchanger assembly as shown in FIG. 4 is manufactured using the above laminated unit (20).

That is, several units (20) are sequentially stacked vertically and forwardly with the peripheral edges of the adjacent molded plates (10) matching each other, and the upper and lower side plates (3) (3) and the header are stacked one on top of the other. (4) and (4') are arranged at predetermined positions. In addition, when using the inner fin (7), it is gradually inserted into the recess (16) formed in the flat bulge of the upper molding plate of the laminated unit (20).

After completing the setting to the heat exchanger assembly as described above, this assembly is fixed using an appropriate jig so that the members do not shift from each other, and brazing is performed in this state, and the molded plate ( 10) The outer fins (2) and the headers (4), (4-), etc. are joined and integrated. This brazing is generally performed by furnace brazing, but is not particularly limited to this method. This brazing achieves airtight joining of each component.

After brazing is completed, the heat exchange medium inlet pipe (9) and the heat exchange medium outlet pipe (9') are connected to the inlet header (4) and the outlet header (4'), respectively.

As shown in Fig. 1, the heat exchanger manufactured as described above has a tube element (1) composed of a pair of molded plates (10) (lO) and an outer fin (2).
) are stacked in multiple stages in an alternating arrangement in the vertical direction, and each tube element is mutually connected to a molded plate (1
0) are in communication via the heat exchange medium circulation holes (13). The heat exchange medium supplied from the inlet pipe (9) enters the lowermost tube element from the inlet header (4) and flows through each tube element (1) up to the uppermost tube element. After exchanging heat with the air flowing through the air circulation gap including the outer fins (2゛) between the tube elements, the outlet header (4')
From there, it is sent to a compressor (not shown) or the like via an outlet pipe (9'').

Although not shown, preferably, the flow direction of the heat exchange medium is changed for each group of a predetermined number of tube elements to cause the medium to flow in a meandering manner in the tank portion (5) of the tube element (1). Install a partition board as much as possible,
This constitutes a so-called multi-pass type heat exchanger in which the heat exchange medium circuit group is divided into two or more. In addition, in the illustrated embodiment, two identical molded plates having a protrusion (14) formed only on the bulge (12) at one end were used as the molded plates (10) constituting the laminated unit (20). A molded plate having a ridge formed on each of its bulges and a molded plate having no ridge at all may be used as a set. Further, in the illustrated embodiment, a heat exchanger having a structure in which the tube element (1) and the outer fin (2) are arranged horizontally is manufactured, but a vertical heat exchanger may also be used.

Effects of the Invention As described above, the present invention uses a laminated unit in which two molded plates are caulked in advance with an outer fin interposed therebetween, and sets the assembly into an assembly by laminating a plurality of the units. It is something. Therefore, during setting, it is no longer necessary to individually set the above-mentioned parts temporarily fixed as a unit as in the past, and the number of setting parts can be greatly reduced. As a result, the setting work time and the heat exchanger manufacturing time can be shortened, and productivity can be improved. It also becomes possible to automate the setting work, in which case further improvements in productivity can be expected. Moreover, since the molded plates in the laminated unit are temporarily fixed in an appropriate positional relationship, this, together with the reduction in the number of setting parts, can significantly reduce the risk of mutual misalignment of parts during setting. It is possible to provide a heat exchanger with stable quality in which each part is placed in the proper position. However, in this invention, it is necessary to fabricate the laminated unit before setting, but this fabrication involves attaching a ridge formed at the periphery of the heat exchange medium circulation hole to one of the corresponding bulges of the two molded plates to the other. This is done by fitting it into the flow hole of the molded plate and expanding it.
The laminated unit can be manufactured extremely easily, so this has no effect on shortening the manufacturing time and improving productivity of the heat exchanger.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the main parts of the heat exchanger in the completed state, Figure 2
FIG. 3 is a sectional view showing the fitting portion of the molded plates in the laminated unit, and FIG. 4 is a front view of the assembly when temporary assembly is completed. (1)...Tube element, (2)...Outer fin, (5)...Tank part, (6)...Flat tube part, (10)...Molding plate, (11)... ... flattened bulge, (12) ... bulge, (13) ... heat exchange medium circulation hole, (14) ... ridge, (20) ... laminated unit. that's all

Claims (1)

[Claims] It has a bulge with a large bulge height at both ends of the flat bulge,
A protrusion is formed at the peripheral edge of the circulation hole on one side of the corresponding bulge of two molded plates each having a heat exchange medium circulation hole on the top surface of the bulge, and each of the molded plates has a corresponding bulge. After arranging the plates facing each other with the opening surfaces facing outward and the outer fins interposed between the flat bulges of both plates so that their top surfaces abut each other, one of the molded plates was A laminated unit is used in which the projecting edge is fitted into the flow hole of the other molded plate and expanded, and both plates are caulked together. By laminating a plurality of such units, the expansion is caused at both ends of the flat tube part. It is characterized by temporarily assembling plate-shaped tube elements having protruding tank portions and outer fins into an assembly in which they are laminated in an alternating arrangement, and then brazing the molded plates and outer fins to each other and integrate them. A method for manufacturing a laminated heat exchanger.