JPH0682187A - Corrugated fin and heat exchanger using corrugated fin - Google Patents

Abstract

PURPOSE:To provide a corrugated fin capable of simply preventing buckling upon assembling, and provide a heat exchanger using the corrugated fin. CONSTITUTION:A heat exchanger is formed by forming a core 7 by alternately laminating a corrugated fin and a tube 9, and assembling a tank 8 on opposite sides of the core 7. A buckling part folded toward the outside of a bend of a bent top portion 2 of the corrugated fin 1 is provided on the bent top part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an air conditioner for automobiles,
The present invention relates to a corrugated fin used for a heat exchanger of various cooling devices and a heat exchanger using the corrugated fin.

[0002]

2. Description of the Related Art When manufacturing a heat exchanger using corrugated fins, corrugated fins and tubes are alternately laminated to form a core in the assembling process, and the core is made up to an assembling size for assembling a tank. Is compression molded.

[0003]

However, since the corrugated fin is usually formed of a thin metal plate, when it is compressed by the load P during assembly, as shown in FIG.
Corrugated fins 10 stacked between core tubes 9
However, there was a problem that it was easy to buckle.

For this reason, conventionally, there has been proposed a technique for preventing buckling by providing a reverse bending portion or a rib on the louver portion of the fin, which tends to buckle during compression, to increase the rigidity of that portion. Japanese Unexamined Patent Publication No. 61-235691, Japanese Unexamined Patent Publication No. 62-
(Refer to Japanese Patent No. 255791).

However, it has not been realized to form a reverse bent portion or a rib on the louver portion of this type of corrugated fin at the time of forming the fin because it is very difficult due to the shape of the forming roller.

The present invention has been made in view of the above points, and an object thereof is to provide a corrugated fin which can easily prevent buckling during assembly and a heat exchanger using the corrugated fin. .

[0007]

In order to achieve the above object, the corrugated fin of the present invention is curved and formed in a continuous wavy shape, and a burring portion bent outwardly is provided at the curved top portion. It is characterized by that.

In the heat exchanger of the present invention, continuous corrugated corrugated fins and tubes are alternately laminated to form a core, and tanks are assembled on both sides of the core. It is characterized in that the curved top portion is provided with a burring portion that is bent outward in the curved direction.

[0009]

[Operation / Effect] Since the burring portion bent toward the outside of the curve is provided on the curved top of the corrugated fin,
When the corrugated fin is compressed in its thickness direction, its compressive force deforms the burring portion having a lower rigidity at the beginning of compression, then the curved top portion, and finally the louver portion.

For this reason, when the heat exchanger is manufactured, the core formed by stacking the corrugated fins and the tube is compressed to shrink the shape to the assembly size of the tank. By deforming the louver part before it is deformed, the core size can be compressed to the tank assembly size before the louver part is buckled, and buckling of the corrugated fins during assembly can be prevented. can do.

Further, the burring portion of the curved top can be easily processed by providing a slit roller and a burring roller in the corrugated fin forming step, and can be easily carried out without increasing the manufacturing cost. be able to.

[0012]

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

FIG. 1 shows a partial perspective view of a corrugated fin 1 used in a heat exchanger. The corrugated fin 1 is formed into a corrugated shape using an aluminum clad material having a high thermal conductivity, and a louver portion 3 is formed on a flat surface portion between the curved top portions 2 and 2.

Further, each curved top portion 2 is formed with a burring portion 4 which is bent outward in the curved direction. The burring portion 4 is formed by forming two slits in the longitudinal direction of the curved top portion 2 and protruding both side edge portions of each slit to the outside.

FIG. 3 shows a schematic view of an apparatus for forming the corrugated fin 1. Reference numeral 11 is a forming roller for forming the fin material into a corrugated shape, 12 is a feed roller arranged next thereto, 13 is a slit forming roller arranged next thereto, 1
Reference numeral 4 denotes a receiving roller which is arranged to face the slit forming roller 7. The slit forming roller 13 has a cutting edge 13a,
The material is pressed onto the receiving roller 14 by the cutting blade 13a to form a slit on the curved top portion.

Reference numeral 15 is a feed roller, and 16 is a feed roller 15.
Is a burring roller arranged next to. The burring roller 16 has burring teeth 16a, and an elastic roller 17 is arranged at a position facing the burring tooth 16a.

In this molding apparatus, when the material having the slit formed on the curved top enters between the burring roller 16 and the elastic roller 17, the burring teeth 16a are pushed into the slit of the material, and both side edges of the slit are outside. A burring portion 4 is formed on each curved top portion 2 of the corrugated fin 1.

As described above, if the slitting roller 7 and the burring roller 16 are provided in the corrugated fin forming step, the burring portion 4 can be formed relatively easily during molding.

As shown in FIG. 4, such a corrugated fin 1 is alternately laminated with tubes 9 to form a core 7. Then, on both sides of the core 7, the sub plate 5
And the load P is applied to the core 7 via the sub-plate 5, and the core 7 is compression-molded to the mounting dimension of the tank 8.

Since the curved top portion 2 of the corrugated fin 1 is provided with the burring portion 4 bent outward in the curved direction, when the corrugated fin 1 is compressed in its thickness direction, its compressive force is The burring portion 4 having a lower rigidity is deformed, then the curved top portion 2 is deformed, and finally the louver portion 3 is deformed.

Therefore, at the time of manufacturing the heat exchanger, the core 7 in which the corrugated fins 1 and the tubes 9 are laminated is compressed,
When the shape is shrunk to the assembling size of the tank 8, the curved top portion 2 of the corrugated fin 1 and its burring portion 4 are deformed before the deformation of the louver portion 3, so that the louver portion 3 is buckled. The size of the core 7 can be compressed to the size of the tank 8 assembled, and buckling of the corrugated fin 1 during assembly can be prevented.

FIG. 5 shows a core compression amount D of a conventional corrugated fin having no burring portion and a corrugated fin of the present invention provided with a burring portion when a load P is applied in the thickness direction and a strength test is performed. It is a graph which shows.

The corrugated fins of the prior art and the present invention in this test example use an aluminum clad material having a thickness of 0.1 mm, the corrugated thickness of the fin is 7.8 mm, and the width thereof is 1 mm.
The corrugated fin of the present invention has a length of 4 mm and a height of 0.06 mm.
The burring part of was formed and a strength test was performed.

As can be seen from the graph of FIG. 5, in the core of the corrugated fin of the present invention having the burring portion, the compression amount (deformation amount) up to buckling can be greatly increased as compared with the conventional core. Before the buckling occurs, the fins can be prevented from buckling by performing compression according to the assembling dimension of the tank.

In the above embodiment, two burring portions are formed on each curved apex, but one burring portion 24 may be formed as shown in FIG. 6A, or a circular burring portion may be formed as shown in FIG. 6B. It is also possible to provide a plurality of burring portions 34.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a corrugated fin showing an embodiment of the present invention.

FIG. 2 is an enlarged partial sectional view of FIG.

FIG. 3 is a structural explanatory view of a corrugated fin forming device.

FIG. 4 is an explanatory diagram for compressing the core.

FIG. 5 is a graph of the amount of compression with respect to the load when the core is compressed.

FIG. 6 is a partial perspective view of a corrugated fin showing another embodiment.

FIG. 7 is an explanatory view showing a buckling state when the core is compressed.

[Explanation of symbols]

 1-corrugated fin, 2-curved top, 3-louver part, 4-burring part, 7-core, 8-tank, 9-tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Matsuzaki 1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (2)

[Claims] 1. A corrugated fin, wherein the corrugated fin is formed in a continuous wavy shape, and a burring portion bent outwardly of the curve is provided on the curved top portion. 2. A heat exchanger in which continuous corrugated corrugated fins and tubes are alternately laminated to form a core, and tanks are assembled on both sides of the core, wherein a curved outer portion is formed on a curved top portion of the corrugated fin. A heat exchanger characterized in that a burring portion bent toward is provided.