JPH0335989Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention mainly relates to a heat radiator of an oil cooling heat exchanger housed in one tank of an automobile radiator.

[Technical background of the invention and its problems]

This application relates to an improvement of an oil cooler for automobiles (Utility Model Application No. 154376/1983) which the present applicant had already proposed. A thin metal plate 3 for enlarging the soldering surface is interposed.

That is, the heat exchanger as an oil cooler for automobiles proposed previously in Utility Model Application No. 58-154376 (see Utility Model Application Publication No. 62-47022) is constructed as shown in FIG. This heat exchanger consists of a pair of elongated corrugated metal plates 2a and 2b stacked together as shown in FIGS. 2 and 4.
A brazing material is interposed between the respective ridge lines so that they intersect. Then, a plurality of such heat sinks made up of a pair of corrugated metal plates 2a and 2b are stacked as shown in FIG. Each heat sink is integrally brazed. here,
Focusing on the brazed portion between the pair of corrugated metal plates 2a and 2b, the flange 1 is formed on the periphery as shown in Figures 4 and 6, and the space between them is firmly brazed. . However, in the waveform portion, since the waveforms intersect as shown in FIGS. 4 and 7, they contact only at the intersection B (FIGS. 4 and 6). Therefore, in this heat radiating body, except for the flange 1, the intermediate portion thereof is brazed only at point B where the convex portions of the corrugated inner surface contact each other, so there was a risk that the pressure resistance would be slightly lacking. This state is shown in FIG. As shown in the figure, the pair of corrugated metal plates 2a and 2b are brazed only at the intersections of the respective waves in their intermediate portions, and the brazed portions 11 are formed in the form of dispersed dots.

[Summary of the idea]

Therefore, an object of the present invention is to secure a relatively wide brazing surface even in the widthwise central portion of the corrugated metal plates 2a and 2b, and to improve pressure resistance.

In other words, this heat exchanger consists of a pair of long and thin corrugated metal plates.
2a and 2b, and the corrugated metal plates have a pair of openings 5 and 6 formed at both ends in the longitudinal direction, respectively, for the inflow and outflow of the heat exchange medium. At the same time, a flange 1 for brazing is formed on the peripheral edge thereof, and most of the flange except for the flange has a corrugated cross-section. Further, a thin metal plate 3 for enlarging the soldering surface is interposed between the corrugated metal plates 2a and 2b only at the center in the width direction and between the openings 5 and 6. This thin metal plate 3 is extremely thin compared to the thickness of the corrugated metal plates 2a and 2b, and is formed into a band shape, which is parallel to the longitudinal direction of the corrugated metal plate and from both edges in the width direction of the thin metal plate. are arranged in a continuous band shape so as to protrude relatively widely in the width direction. The present invention is characterized in that both the corrugated metal plates 2a, 2b and the thin metal plate 3 and the flanges 1, 1 are brazed together.

Therefore, a relatively wide brazing surface is ensured also in the center portions of the corrugated metal plates 2a, 2b. Therefore, the pressure resistance of the heat sink is greatly increased compared to the case without the thin metal plate 3. This state is shown in FIG. 12, and as is clear from the figure, the brazed portion 12 is attached to each corrugated metal plate 2.
It is formed linearly along the valleys a and 2b. Even if this is compared with the conventional point-shaped brazed portion 11, it is clear that the brazed area is significantly increased.

[Example of idea]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 9 is a plan view of the heat sink of the present invention, in which the corrugated metal plate 2a shown in FIG. 2 and the corrugated metal plate 2b shown in FIG. A thin metal plate 3 is interposed therebetween. 10 is a sectional view taken along line CC in FIG. 9; In this embodiment, as shown in FIG. 9, the thin metal plate 3 for expanding the soldering surface is one example, and
A thin steel plate with a thickness of about 0.1 mm is used, which is 1/3 or less of the width of a and 2b, has a length that does not reach the openings at both ends. Note that a large number of small holes for oil circulation may be bored in the steel plate. Both sides of the thin metal plate 3 for expanding the soldering surface and each corrugated metal plate 2a,
2b, or a brazing material is applied to the inner surface of each corrugated metal plate 2a, 2b in advance to form a clad layer.
A pair of such corrugated metal plates 2a, 2b
The heat dissipating materials made of the above are laminated as shown in FIG. 8, a brazing material is interposed between them, and the brazing material is melted in a vacuum furnace or an inert gas furnace to integrally braze them. Then, as is clear from FIGS. 9 and 10, in each heat sink, both surfaces of the thin metal plate 3 form a large number of streak-shaped soldered surfaces on the corrugated metal plates 2a and 2b, spaced apart by the pitch of the corrugations. be done. As a result, the brazed surface of the corrugated metal plates 2a and 2b is dramatically expanded at the intermediate portion via the thin metal plate 3. Therefore, the pressure resistance of the heat sink is improved.

This state is shown in FIG. 12, and as is clear from the figure, the brazed portion between the thin metal plate 3 and the corrugated metal plates 2a and 2b is It is formed linearly along the valley.

According to experiments, when the thin metal plate 3 was interposed, the pressure resistance was three times or more higher than when the thin metal plate 3 was not interposed. In other words, the internal pressure inside the heat sink is reduced from 0 to
In an impulse test that repeatedly applied up to 10 kg/cm ² , its watertight or airtight durability was determined to be 3.
By interposing it, the improvement was more than three times.

Note that in this heat exchanger, oil flows in from one port in FIG. 1, and oil flows out from the other port. Cooling water is made to flow through the outer surface of the heat exchanger and the gaps formed in the diagonal direction of each stacked heat radiator to perform heat exchange. At this time, the oil flows from the opening in Fig. 8 to the manifold part 8.
It flows into each heat radiator through the radiator, enters obliquely forward along the corrugated portion of one corrugated metal plate 2a, and moves in a zigzag pattern along the corrugation of the other corrugated metal plate 2b. At this time, since the thin metal plate 3 itself is located in the oil flow path, it has the effect of promoting agitation of the oil.

[Effect of idea]

The heat exchanger of the present invention consists of a pair of elongated corrugated metal plates 2
a and 2b, and a frame part 1 for brazing is formed on the peripheral edge thereof, and most of the part except for the flange part 1 is formed in a corrugated cross-section, and the ridgeline of the corrugation is at the center along the longitudinal direction. It is inclined to the line. Then, the pair of metal plates are placed on top of each other in opposite directions so that their ridge lines intersect.
Furthermore, a thin metal plate 3 for enlarging the soldering surface is interposed between the two metal plates 2a and 2b at the center in the width direction,
It is characterized by brazing between them and between the respective flanges 1, 1.

The heat sink of the present invention has the above configuration,
It has the following effects.

(1) The heat sink of the present invention consists of a pair of corrugated metal plates 2a, 2
A thin metal plate 3 for enlarging the soldering surface is interposed between b and at the center in the width direction. Since they are brazed together and between the respective flanges 1, 1, a relatively wide brazing surface is ensured even in the center portions of the corrugated metal plates 2a, 2b where the ridge lines intersect. Therefore, the pressure resistance and durability of the heat radiator is greatly increased compared to the case without the thin metal plate 3.

(2) Furthermore, since the thin metal plate 3 is interposed at the widthwise central portion of the corrugated metal plates 2a and 2b, the thin metal plate 3 itself has the effect of stirring the fluid flowing within the heat sink.

(3) Furthermore, although this heat radiator has extremely low fluid resistance compared to conventional multi-entry buffers interposed between a pair of metal plates, it has a less agitating effect on circulating oil, etc. It has excellent heat dissipation properties.

(4) Moreover, this heat sink has an extremely simple structure, can be provided at low cost, and can be made thin. Furthermore, when this heat sink is used as an oil cooler, the corrugated surfaces that intersect with each other not only on the oil side but also on the water side have a water agitating effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a heat exchanger to which the present invention is applied, Fig. 2 is a plan view of a corrugated metal plate 2a of one of the heat radiating bodies constituting the heat exchanger, and Fig. 3 is an A of Fig. 2. 4 is a plan view showing the other corrugated metal plate 2b of the heat radiator; FIG. 5 is a longitudinal sectional view of the heat radiator without the thin metal plate 3 interposed therebetween;
FIG. 6 is a cross-sectional view of the same, FIG. 7 is a partially broken explanatory view thereof, and FIG. 8 is a partial vertical cross-sectional view of a heat exchanger in which heat radiators are laminated in the same state. FIG. 9 is a plan view of the heat sink of the present invention, and FIG. 10 is a sectional view taken along the line CC in FIG. 9. FIG. 11 is an explanatory diagram showing the brazed portion 11 at the intermediate portion of a pair of corrugated metal plates 2a and 2b in a conventional heat sink, and FIG. 12 is an explanatory diagram showing the brazed portion 11 between the corrugated metal plate and the thin metal plate in the heat sink of the present invention. An explanatory diagram showing a mounting part. DESCRIPTION OF SYMBOLS 1... Flange part, 2a, 2b... Corrugated metal plate, 3... Thin metal plate, 4... Heat exchange, 5, 6... Port, 7... Oil flow passage, 8... Manifold part, 9... Cooling waterway, 10...
bottom.

Claims (1)

[Scope of utility model registration request] A pair of ports 5 and 6 for inflow and outflow of the heat exchange medium are provided at both ends in the longitudinal direction, and a flange 1 for brazing is formed at the peripheral edge of each, and most of the portion except for the flange 1 has a corrugated cross section. A pair of elongated corrugated metal plates 2a and 2b, the troughs of which are located substantially on the same plane as the flange 1, and the ridge lines of the waves are inclined with respect to the center line along the longitudinal direction. The two metal plates 2a and 2b are stacked in opposite directions so that their respective ridge lines intersect, and both metal plates 2a and 2
A band-shaped solder strip that is significantly thinner than the thickness of the corrugated metal plates 2a and 2b and has a width less than half of the width of the corrugated metal plates is provided between the center line and between the two ends 5 and 6 between A thin metal plate 3 for enlarging the contact surface is interposed parallel to the longitudinal direction of both of the corrugated metal plates, and such that the corrugations protrude relatively largely from both widthwise edges of the thin metal plate in the width direction. , and between the respective flanges 1 and 1 by brazing.