JPS6336690Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air-cooled heat radiator, particularly an air-cooled heat radiator used in broadcasting equipment and the like.

[Conventional technology]

Electronic component boards such as broadcasting equipment that generate considerable heat during operation have traditionally been cooled using water-cooled radiators, but the cooling water circulation system is complex and costly. Also, in order to avoid problems caused by water leakage, air-cooled radiators have come to be used in recent years.

This type of air-cooled heat radiator has a heat sink integrated with or joined to a heat receiving plate, and cooling air is forced to flow between the heat sinks.Recently, however, the heat receiving plate and the heat sink have Aluminum material began to be used. This is very effective in improving cooling efficiency and reducing weight. The so-called positioning work, in which thin heat sinks are arranged and joined at regular intervals between the plates, is also a work that requires considerable effort and skill.

As a solution to these drawbacks, JP-A-Sho
There are inventions disclosed in Publication No. 57-188854 and Japanese Patent Application Laid-open No. 188855/1982.

[Problem that the invention attempts to solve]

However, in the heat dissipation plates in the above invention, the bent portions at both ends in the width direction are bent in a direction perpendicular to the plate and have an L-shaped cross section, so the structural strength is weak, especially in the case of a thin aluminum plate. There is a problem in terms of strength, and when a thin heat sink is placed between two heat receiving plates at regular intervals, the ends of the bent portions formed at both ends of the heat sink are connected to both ends of the adjacent heat sink. When assembling the heat sinks, they are placed in contact with the back surface of the heat sink, and are stacked one after the other while maintaining a certain distance. There are also problems in that the heat dissipation plate may end up riding on the L-shaped bent portion of an adjacent heat sink, and that a considerable degree of skill is required for the lamination assembly work.

Furthermore, this heat sink is disclosed to be provided with two types of spacer claws in order to provide a reinforcing effect to prevent deformation due to contact during assembly or use.

One type has a serrated or convex cross-section, as shown in Figure 7, and the other has a hook-shaped shape by cutting and raising it, as shown in Figure 3. be.

However, in the case of the former spacer claw with a serrated cross section, it makes point contact or line contact with the adjacent heat sink, so when it receives pressing force in the thickness direction (layering direction) during assembly or use, it becomes soft and There is a risk that the heat sink, which is made of a thin aluminum plate, will be punctured and damaged. Further, in the case of the latter spacer claw which is formed into a hook shape by cutting and raising, there are various problems such as deterioration of the strength of the heat sink.

[Means for solving problems]

The present invention was devised to solve the above-mentioned problems with conventional air-cooled heat sinks. A folded portion having a constant thickness is formed at both ends of the heat sink that are in contact with the heat receiving plate, and a protrusion formed by drawing with the apex flat between the folded portions at both ends in the width direction of the heat sink is formed next to the heat sink. The air-cooled heat radiator is characterized by being formed so that the matching heat radiating plates do not overlap.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings. As shown in the whole in FIG. It is composed of a large number of heat dissipation plates 3 also made of aluminum material arranged and bonded between them.
An electronic device (for example, a transistor) board T is attached to the upper surface of the heat receiving plate 1 in close contact with it.

The heat dissipation plate 3 is a rectangular plate having a length approximately equal to the depth of the heat receiving plates 1 and 2 and a certain width, and both ends of this width direction are as shown in FIGS. 2a to 2d.
The folded portion 4 is formed to have a constant thickness. In other words, Fig. 2 a is bent into a U-shape, Fig. 2 b is bent into a U-shape, Fig. 2 c is bent into a hook-shape, and Fig. 2 d is bent into a ring shape, and the thickness t is the maximum required heat dissipation amount of the heat sink of the present invention. It is determined by the length, width, and quantity of the heat sinks 3 as well as the spacing between the heat sinks 3, which is determined based on the airflow resistance and the like.

In addition, when the required heat radiation amount increases and the length or width of the heat sink 3 increases, air resistance,
When the thickness of the plate is reduced in consideration of heat transfer area or weight reduction, the position near both ends in the width direction is reliably held by the folded portions 4, but the position near both ends in the width direction is Otherwise, they are easily deformed due to assembly errors and the effects of heat and wind speed, making it difficult to accurately maintain the distance between adjacent heat sinks.

Therefore, as an embodiment of the present invention, a protrusion 5 is formed between the folded portions 4 at both ends in the width direction of the heat dissipation plate 3 by drawing, with the apex being a flat surface, as shown in FIGS. 3 to 5.

That is, the one shown in FIG. 3 has protruding stripes 5a having a trapezoidal cross section formed in the length direction, and the one shown in FIG. 4 has truncated conical dimples 5b formed at regular intervals in the length direction. The apexes of the protruding portions 5 are all formed by drawing so that they are flat.

When the above-mentioned ridges 5a and dimples 5b are combined with the heat sink 3, as shown in FIG.
Although it is formed by shifting the center in the width direction or length direction so as not to overlap each of the protrusions 5-1, 5-2, 5-3 of the adjacent heat sinks 3-1, 3-2, 3-3, The amount of protrusion t' is equal to or slightly smaller than the thickness t of the folded portion 4. Note that the protruding direction may be opposite to that of the folded portion 4.

When assembling the heat dissipation plate 3 of the present invention between the heat receiving plates 1 and 2, stand up the heat dissipation plates 1 and 2 at an appropriate interval on an appropriate assembly table as shown in Figure 6, and place the required number of plates between them. The heat dissipation plate 3 is inserted in an upright position with its folded portions 4 facing in the same direction, and the brazing sheet 6 is sandwiched between the heat dissipation plate 3 and the heat receiving plates 1 and 2.

In this state, using heat-resistant jigs A and B, first press the heat sink 3 from the left and right with jig A, and then press the heat receiving plates 1 and 2 from the front and back (up and down in the figure) with jig B. Combine with jig A.

Next, if it is charged into a furnace in this state, the brazing sheet 6 will be melted and the brazing between the heat receiving plates 1 and 2 and the heat sink plate 3 will be completed while maintaining the exact spacing between the heat sink plates 3.

Note that although each heat sink 3 is usually arranged in parallel, it is not limited to this.
They may be non-parallel depending on the shape. At this time, the thickness of one of the folded-back portions 4 at both ends of the heat sink 3 may be made large or small depending on the situation. Furthermore, the heat sink 3 may be arranged not at right angles to the heat receiving plates 1 and 2 but at an angle.

[Effect of idea]

The air-cooled heat radiator according to the present invention has folded portions 4 of a constant thickness at both ends of the heat sink 3 disposed between the heat receiving plates 1 and 2, so that it can withstand bending in a direction perpendicular to the thickness of the heat sink 3. Strength increases. Therefore, it is possible to use a long heat dissipation plate made of a thin aluminum plate and having a large heat dissipation area, thereby improving cooling efficiency and reducing weight.

Furthermore, when assembling the heat receiving plates 1, 2 and the heat sink 3, it is possible to insert the heat sink 3 with its folded portions 4 facing in the same direction, and press it from the left and right with the jigs A and B. The interval between each heat dissipation plate 3 can be easily and accurately set, and unlike the conventional method, there is no need for labor and techniques such as positioning to prevent the plate from riding on the bent portions at both ends when pressed from the left and right sides.

Furthermore, a protrusion 5 with a flat apex is formed between the folded portions 4 at both ends of the heat dissipation plate 3 so as not to overlap with the adjacent heat dissipation plate 3, as shown in FIG. The heat sinks 3, 3 come into contact with each other at the apex plane of the protrusion 5. Therefore, the spacing of the heat sinks 3, especially near the center in the width direction, can be maintained accurately, and even when the stacked heat sinks 3, 3 are pressed from the left and right sides, they do not deform. There will be no damage.

Since the protrusion 5 is formed by drawing, the heat sink 3 itself is also reinforced, so it is possible to make the heat sink 3 from a fairly thin plate without any problem. There are various effects.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of the air-cooled radiator according to the present proposal;
Figures 2 a to d are explanatory cross-sectional views showing embodiments of the folded portions at both ends of the heat sink, Figures 3 and 4 are partial perspective views of the heat sink of the present invention, and Figure 5 is a partial front view of the heat sink of the present invention. , FIG. 6 is an explanatory diagram of the assembly of the heat sink of the present invention. DESCRIPTION OF SYMBOLS 1, 2... Heat receiving plate, 3... Heat radiating plate, 4... Bending part, 5... Protrusion part, 6... Brazing sheet.

Claims (1)

[Scope of utility model registration request] In an air-cooled heat sink in which a large number of heat sinks are arranged between two or more heat sinks, a folded portion having a constant thickness is formed at both ends of the heat sink that are in contact with the heat sink, and a folded portion is formed in the width direction of the heat sink. An air-cooled heat radiator characterized in that a protruding part formed by drawing with a flat apex between the above-mentioned both end folded parts is formed so as not to overlap between adjacent heat radiating plates.