JP2000031353A - Heat radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light, high-performance heat radiator suited to mass production and used adequately for cooling a high-capacity LSI. SOLUTION: A plurality of thin plates 20 are arranged at given intervals and fixed on a bottom plate 10. Each thin plate 20 has a plurality of projected parts 24 extruded from the face of the thin plate 20. Then, the thin plates 20 are positioned with the projected parts 24 as spacers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator used for cooling semiconductor devices and the like, and more particularly to a separate radiator in which a fin portion and a bottom plate portion are formed by different members and joined. In particular, the present invention relates to a thin plate parallel type separate radiator in which a number of independently separated thin plates are juxtaposed at predetermined intervals and fixed on a bottom plate.

[0002]

2. Description of the Related Art With the increase in the degree of integration of LSIs, the amount of heat generated is steadily increasing, and the importance of measures against heat is increasing more and more. There is a radiator as one of the heat measures of LSI, and until now, it has been mainly dealt with by an integrated product by extrusion molding. However, in the case of an extruded product, it is difficult to improve the performance more than the current state due to restrictions on the molding process. In addition, the weight is higher than the plane area, which is an obstacle to improving the performance.

That is, the performance of the radiator is determined by the fin height, the fin thickness, and the fin pitch when the plane area and the material are the same. For high performance, it is required that the fin height is large and the fin thickness and fin pitch are small. However, in an extruded product, it is difficult to form a high and thin fin at a dense pitch, and a fin height of 20 to 60 mm, a fin thickness of 1 to 2 mm, and a fin pitch of 4 to 6 mm is a tentative limit. Also,
Increasing the plane area is also effective for improving the performance, but in an extruded product, the weight increase due to the increase in the area is remarkable. For these reasons, it is considered that it is difficult to improve the performance beyond the current level.

[0004] Under such circumstances, next-generation LSIs are expected to have a high-performance, lightweight next-generation radiator that can be used instead of an extruded product.
There is a need for a fin having a thickness of 60 mm x a fin thickness of 0.2 to 1.0 mm x a fin pitch of 1.5 to 3.0 mm, which is as light and inexpensive as possible.

For example, there is a separate type which meets this demand. In this method, the fin portion and the bottom plate portion are formed by different members and joined, and one of them is disclosed in Japanese Patent Application Laid-Open No. 8-320.
No. 194. JP-A-8-32019
The radiator disclosed in Japanese Patent Publication No. 4 has a structure in which corrugated fins formed by processing a strip-shaped thin plate into and out of irregularities are brazed on a bottom plate. In the case of this radiator, it is easy to reduce the fin thickness and it is also advantageous in terms of weight reduction.However, due to processing restrictions, large fin height and small fin pitch are not compatible. It is said that it is difficult to secure performance that greatly exceeds.

Considering such circumstances comprehensively, among the separate types, in particular, a thin plate parallel type in which a plurality of independently separated thin plates are arranged in parallel at a predetermined interval and fixed on a bottom plate, There are relatively few restrictions on processing, and this is considered the most promising. Then, as a radiator of this type, a groove for mounting a thin plate is cut on the upper surface of the bottom plate, and the root portion of the thin plate is fitted in the groove, and then the fitting portion is caulked to form a large number of sheets on the bottom plate. A caulking type in which a thin plate is erected is disclosed in Japanese Utility Model Laid-Open No. 2-58342.

[0007]

However, in the caulking type thin plate parallel type radiator disclosed in Japanese Utility Model Application Laid-Open No. 2-58342, a pressing body is inserted between the thin plates fitted in the grooves, and the pressing body is used. Since the fitting portion is crimped, it takes time and effort to manufacture. In addition, when the gap between the thin plates is narrow, it is not easy to insert the pressing body, and the thickness of the pressing body becomes thin, and it becomes difficult to secure enough strength to withstand caulking. Some restrictions cannot be reduced. For these reasons, mass production is low and the production cost increases,
In fact, no significant improvement in performance can be expected.

In order to solve this problem, the present applicant has previously developed a thin-plate parallel type radiator of a brazing type in which a large number of thin plates are fixed on a bottom plate by brazing.
No. 8852 filed a patent application. According to this structure, thin plates can be arranged in high density, and a light-weight, high-performance radiator can be obtained. However, it was found that the production cost was not sufficiently reduced in the process of repeating the trial production. That is, the work of positioning the thin plate at the time of brazing is difficult, and a high-precision jig is required for the positioning, so that mass productivity is not improved.

An object of the present invention is to provide a radiator that is lightweight, has high performance, and is excellent in mass productivity.

[0010]

In order to achieve the above object, a first radiator of the present invention is a thin-plate parallel type radiator in which a plurality of thin plates are arranged in parallel at predetermined intervals and fixed on a bottom plate. In (2), the lower edge of each thin plate is bent while leaving a part in the width direction, so that a downward convex portion is formed in a part thereof, and the convex portion of each thin plate is inserted into a concave portion provided on the upper surface of the bottom plate. At the same time, the bent portion is brazed to the upper surface of the bottom plate.

In the first radiator of the present invention, the convex portions formed on the lower edge portion of each thin plate are inserted into the concave portions provided on the upper surface of the bottom plate, so that each thin plate is arranged at an arbitrary interval on the bottom plate. Easy positioning and tacking. Each temporarily attached thin plate is fixed by brazing a bent portion formed on the side of the convex portion to the upper surface of the bottom plate. As a result, the fin height is 20 to 60 mm x the fin thickness is 0.2 to 1.0 m
High performance and lightweight design such as mx fin pitch of 1.5 to 3.0 mm is possible. In addition, since the positioning of each thin body is easy and the fixing is easily performed by brazing, the mass productivity is high.

The recess provided in the bottom plate is preferably a slit penetrating between both surfaces of the bottom plate from the viewpoint of workability and mass productivity.

The second radiator of the present invention is a thin-plate parallel type radiator in which a number of thin plates are arranged in parallel at a predetermined interval and fixed on a bottom plate. One or a plurality of protruding portions formed by protruding a part of the protruding portion from the plate surface are provided, and a number of thin plates are arranged in parallel using the protruding portions as spacers.

In the second radiator of the present invention, since the spacers are integrally formed on the respective thin plates, the thin plates can be easily positioned at arbitrary intervals only by arranging the thin plates in parallel on the bottom plate. . Therefore, even with this radiator, the fin height is 20 to 6
A high-performance and lightweight design of 0 mm x fin thickness of 0.2 to 1.0 mm x fin pitch of 1.5 to 3.0 mm is possible, and in the manufacturing process, concave parts are formed in the bottom plate and thin sheets are inserted. Even the need for mass production is further increased.

The projection provided on the thin plate can be formed by expanding a part of the thin plate. Also,
It can be formed by forming an opening in a thin plate and projecting part or all of the periphery of the opening from the plate surface.

When the projecting portion has an opening, the thin plates are arranged on the bottom plate by connecting the multiple thin plates into a unit by a connecting member penetrating through the multiple thin plates and being inserted into each opening. Work is no longer necessary. Further, the rigidity is improved.

To improve the rigidity, it is also effective to braze the protruding portion to the thin plate or the connecting member on the protruding side and connect the adjacent thin plates directly or via the connecting member.

Regarding the fixing structure of each thin plate, a structure in which the lower edge of each thin plate is bent and joined to the upper surface of the bottom plate by brazing or the like is preferable from the viewpoint of mass productivity and the like.

In any of the radiators, the top edge of each thin plate can be bent and a top plate can be joined thereon by brazing or the like. The merit of attaching the top plate is
For example, when air is forcibly circulated between many thin plates, a duct is formed between the bottom plate and the top plate, and air circulates without escaping therebetween, thereby improving cooling efficiency and improving rigidity. is there.

The brazing materials used for brazing are as follows. Regarding the joining of the bottom plate and the thin plate and the joining of the thin plate and the top plate, the surface of the bottom plate and the top plate may be coated with a brazing material, but it is also possible to coat the brazing material on the side of the thin plate. Regarding the joining of the thin plates, any surface of the thin plate may be coated with the brazing material, and the surface of the connecting member may be coated with the brazing material. When the brazing material is coated on the surface of the thin plate, if the brazing material is coated on the surface of the thin plate opposite to the protruding portion, the brazing material will be described in detail later. And the top plate and the thin plates can be joined together.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a radiator showing a first embodiment of the present invention.

The radiator of the first embodiment belongs to the first radiator of the present invention. The radiator includes a bottom plate 10 and a plurality of thin plates 20 arranged in parallel in the thickness direction at predetermined intervals on the bottom plate 10. Bottom plate 10 and thin plates 20 and 2
.. Are all made of a material having excellent thermal conductivity such as an Al alloy.

The bottom plate 10 is made of a plate material, for example, 1 to 3 mm thicker than the bottom plate portion of the extruded product. On both sides of the bottom plate 10, a pair of recesses 11, 11 are provided at intervals corresponding to the fin pitch. The recesses 11 are slits penetrating between both surfaces of the bottom plate 10.

Each thin plate 20 is a rectangle having the same width as the bottom plate 10. A pair of convex portions 21 and 21 inserted into the concave portions 11 and 11 are provided at a lower edge portion of the thin plate 20. The protruding portions 21 and 21 are formed by bending portions except for both side portions of the lower edge of the thin plate 10 at right angles. Convex part 2
Along with the formation of 1 and 21, a bent portion 22 perpendicular to the thin plate 10 is formed therebetween.

Then, the projections 21 and 21 of each thin plate 20 are inserted into the recesses 11 and 11 of the bottom plate 10, and the lower surface of the bent portion 22 is brazed to the upper surface of the bottom plate 10 so that each thin plate 120 is placed on the bottom plate 10. It is fixed at a predetermined interval.

The height of the portion above the projections 21 and 21 of the thin plate 20 corresponds to the fin height, and each height of the projections 21 and 21 corresponds to the thickness of the bottom plate 10. The thickness of the thin plate 20 corresponds to the fin thickness.

In the radiator according to the first embodiment, the bottom plate 10 is relatively thin, and there is no processing restriction on the fin height and the fin thickness. Although the fin pitch is somewhat limited by the bent portion 22, the height of the bent portion 22 may be small, so that the fin pitch can be made sufficiently small. Therefore, fin height 20 to 60 mm x fin thickness 0.2 to 1.0 mm
× A high-performance and lightweight design with a fin pitch of 1.5 to 3.0 mm is possible. Also, although the height is small,
Since the bent portion 22 comes into surface contact with the upper surface of the bottom plate 10 and is integrated by brazing, the thermal conductivity between the bottom plate 10 and the thin plate 20 is also good.

As for the mass productivity, the bottom plate 10 has a concave portion 11,
11 can be efficiently formed by punching.
By inserting the convex portions 21 and 21 into the concave portions 11 and 11, the thin plate 20 is temporarily attached on the bottom plate 10 without a jig. After the thin plates 20, 20,... Are temporarily attached to the bottom plate 10, if heating is performed, each thin plate 20 is joined and fixed to the bottom plate 10 by brazing. Therefore, mass productivity is also good. In addition, the brazing material is previously coated on the upper surface of the bottom plate 10 for brazing.

In the radiator of the first embodiment, the end plates 12, 12 and the top plate 40 described later are not provided, but one or both of them can be provided.

FIG. 2 is a perspective view of a radiator showing a second embodiment of the present invention, and FIG. 3 is a cross-sectional plan view of the radiator.

The radiator of the second embodiment belongs to the second radiator of the present invention. The radiator includes a bottom plate 10 and a plurality of thin plates 20 arranged in parallel in the thickness direction at predetermined intervals on the bottom plate 10. Bottom plate 10 and thin plates 20 and 2
.. Are all made of a material having excellent thermal conductivity such as an Al alloy.

The bottom plate 10 is made of a plate material of, for example, 1 to 3 mm sufficiently thinner than the bottom plate portion of the extruded product. At both ends of the bottom plate 10, a pair of end plates 12, 12 formed by bending a part of the bottom plate 10 upward at right angles are provided.

Each thin plate 20 is a rectangle having the same width as the bottom plate 10. The thin plate 20 has a pair of left and right openings 23, 23.
Are provided in two upper and lower stages. Each of the openings 23 is a circular through hole, and the periphery thereof projects cylindrically from the plate surface by burring or the like, and forms a spacer portion 24 between the adjacent thin plates 20. The upper openings 23, 2 are arranged so that the spacers 24 do not overlap between the adjacent thin plates 20, 20.
3 and the lower openings 23 are alternately displaced laterally.

The lower edge of each thin plate 20 is bent at a right angle in the same direction as the projecting direction of the spacer portion 24, and the lower surface of the bent portion 25 is brazed to the upper surface of the bottom plate 10, whereby each thin plate 20 is bent. Are fixed on the bottom plate 10 at predetermined intervals. The height of the bent portion 25 is
The height is set to be equal to or smaller than the height.

In the radiator according to the second embodiment, the bottom plate 10 is thin, and there is no processing restriction on the fin height and the fin thickness. The fin pitch is also arbitrarily selected according to the protruding height of the spacer portion 24. Therefore, a high-performance and lightweight design such as a fin height of 20 to 60 mm, a fin thickness of 0.2 to 1.0 mm, and a fin pitch of 1.5 to 3.0 mm becomes possible. Further, since the bent portion 25 comes into surface contact with the upper surface of the bottom plate 10 and is joined by brazing, the heat conductivity between the bottom plate 10 and the thin plate 20 is also excellent.

Regarding mass productivity, since the spacer portions 24, 24, 24, 24 are integrally formed on each thin plate 20, the bottom plate 1
By inserting the thin plates 20, 20,... Between the end plates 12, 12, the thin plates 20, 20,... Are arranged at predetermined intervals without any jig or insertion work, and temporarily fixed on the bottom plate 10. Is done. If heating is performed after the temporary fixing, each thin plate 20 is joined and fixed to the bottom plate 10 by brazing. Therefore, mass productivity is also very good. In addition, the brazing material is previously coated on the upper surface of the bottom plate 10 for brazing.

The structure of the end plates 12, 12 is an integral structure formed by bending a part of the bottom plate 10, which is excellent in mass productivity, but is a separate structure joined by brazing or the like. Is also good.

In the radiator of the second embodiment, a top plate 40 described later is not provided, but it may be provided. Although the brazing material is coated on the upper surface of the bottom plate 10, it is also effective to cover each of the thin plates 20, 20,..., Particularly on the surface opposite to the direction in which the spacer portion 24 protrudes. Then, the tip of the spacer portion 24 is
The adjacent thin plate 2 is bonded to the surface of the opposite thin plate 10 and
0 and 20 are connected and fixed, and the rigidity is improved. Also,
Since the bent portion 25 projects in the same direction as the spacer portion 24, the bottom plate 10 and each thin plate 20 are also joined by this brazing material. Further, a top plate 40 described later and each thin plate 20 are also joined.

FIG. 4 is a perspective view of a radiator showing a third embodiment of the present invention.

The radiator of the third embodiment also belongs to the second radiator of the present invention. This radiator differs from the radiator of the second embodiment in the spacer portion 24. That is, the spacer portion 24 here is formed by expanding a part of the thin plate 20 in the height direction over the entire width. The forming position and the number of the formed thin portions are periodically changed so that the spacer portions 24 do not overlap between the adjacent thin plates 20.

This radiator, like the radiator of the second embodiment, is lightweight, has high performance, and is excellent in mass productivity.

The cross-sectional shape of the spacer portion 24 is rectangular here, but may be triangular or semicircular, and is not particularly limited. The formation position and the formation number are not limited to this embodiment. For example, the same number of spacer portions 24 may be formed at different positions. Further, the spacer portion 24 may have a discontinuous shape in the width direction such that a part of the thin plate 20 bulges in a hemispherical shape.

Although the radiator of the third embodiment is not provided with a top plate 40 described later, it can be provided. In addition to coating the brazing material on the upper surface of the bottom plate 10, it is also effective to coat each surface of the thin plates 20, 20. It is a target. Then, the spacer portion 24 of each thin plate 20 is formed by the brazing material,
And the bent portion 2 of each thin plate 20
5 is joined to the upper surface of the bottom plate 10.

FIG. 5 is a perspective view of a radiator showing a fourth embodiment of the present invention, and FIG. 6 is a cross-sectional plan view of the radiator.

The radiator of the fourth embodiment also belongs to the second radiator of the present invention. This radiator is different from the radiator of the second embodiment in that the thin plates 20, 20,.
The main difference is that they are integrated by 30, 30, 30. Also, in connection with the use of the connecting members 30, 30, 30, 30, the four openings 23,
23, 23, 23 are provided at the same position on each thin plate 20, and the end plates 12, 12 are omitted.

Each connecting member 30 is here formed of a round pipe having substantially the same length as the bottom plate 10, and is inserted into the corresponding openings 23, 23,... Of the thin plates 20, 20,. Are fixed to the thin plates 20, 20,. The pipe expansion process is easily performed by pushing the pipe expansion head into a round pipe. If a round pipe having an outer surface coated with a brazing material is used, each connecting member 30 can be fixed to the thin plates 20, 20,.
The spacer portions 24, 24, 24, 24 of each thin plate 20 not only regulate the interval between the adjacent thin plates 20, 20, but also come into surface contact with the connecting member 30 to contribute to improvement in fixing strength.

In the radiator of the fourth embodiment, a large number of thin plates 20, 20,... Are connected to four connecting members 30, 30, 30, 3,.
Since they are connected and unitized by zeros, the work of inserting a large number of thin plates 20, 20,. Therefore, the mass productivity is further improved, and the rigidity is also improved.

In the radiator of the fourth embodiment, the end plate 1
Although the top plate 40 described later is not provided,
These can be selectively provided. In addition to coating the brazing material on the upper surface of the bottom plate 10, it is also effective to coat each surface of the thin plates 20, 20. It is a target.
Then, the spacer portion 24 of each thin plate 20 is joined to the surface of the connecting member 30 and the facing thin plate 20 by this brazing material, and the bent portion 25 of each thin plate 20 is attached to the bottom plate 1.
0 is bonded to the upper surface.

FIG. 7 is a perspective view of a radiator showing a fifth embodiment of the present invention, and FIG. 8 is a vertical side view of the radiator.

The radiator of the fifth embodiment also belongs to the second radiator of the present invention. This radiator differs from the radiator of the fourth embodiment in the connecting member 30.

The connecting member 30 is a band-shaped flat plate having both surfaces coated with a brazing material. Each of the openings 23 of the thin plates 20, 20,... Is formed as a slit so that the connecting member 30 can pass therethrough. By using such a connecting member 30, the thin plates 20, 20,.
Bonding to 0 becomes easy.

In this radiator, the thin plates 20, 20.
Each of the upper edges is bent in the same direction as the bent portion 25 of the lower edge, and the top plate 40 is brazed over the thin plates 20, 20,. . As described above, the top plate 40 is effective for improving the heat radiation efficiency and the rigidity when forcibly circulating the air between the bottom plate 10 and the top plate 40. Further, since the flat connecting member 30 is parallel to the bottom plate 10 and the top plate 40, it does not become a resistance of air flowing between the bottom plate 10 and the top plate 40.

In the radiator of the fifth embodiment, the end plate 1
2 and 12 are not provided, but it is also possible to provide them. The brazing material covers not only the upper surface of the bottom plate 10 and the lower surface of the top plate 40, but also covers one surface of each of the thin plates 20, 20,.
It is effective in terms of effective use of brazing filler metal. that way,
With this brazing material, the spacer portion 24 of each thin plate 20 is joined to the connecting member 30 and the surface of the facing thin plate 20, and the bent portions 25 and 26 of each thin plate 20 are attached to the upper surface of the bottom plate 10 and the lower surface of the top plate 40. Each is joined.

FIG. 9 is a longitudinal side view of a radiator showing a sixth embodiment of the present invention.

The radiator of the sixth embodiment also belongs to the second radiator of the present invention. This radiator differs from the radiator of the fifth embodiment in the spacer portion 24.

That is, in the fifth embodiment, the spacer portion 24 is formed symmetrically on the upper edge side and the lower edge side of the slit-shaped opening 23, but is formed only on the lower edge portion in the sixth embodiment. More specifically, it is formed by punching three sides excluding the lower edge and bending the inner part thereof at a right angle.

When the spacer portion 24 having such a bent portion is perpendicular to the plate surface, it is joined to the surface of the connecting member 30 to increase the connecting strength of the thin plates 20, 20,... In this case, by adjusting the bending angle, the protrusion height of the spacer portion 24 from the plate surface is easily adjusted, and the pitch adjustment of the thin plates 20, 20,...

In the radiator of the fifth embodiment, the end plate 1
2 and 12 are not provided, but it is also possible to provide them. The brazing material covers not only the upper surface of the bottom plate 10 and the lower surface of the top plate 40, but also covers one surface of each of the thin plates 20, 20,.
It is effective in terms of effective use of brazing filler metal. that way,
With this brazing material, the spacer portion 24 of the thin plate 20 is joined to the surface of the opposing thin plate 20, and the bent portions 25 and 26 of each thin plate 20 are joined to the upper surface of the bottom plate 10 and the lower surface of the top plate 40. .

The number and shape of the openings 23 of the thin plate 20 can be appropriately changed. One or more slits are required, but two or more round holes or square holes are preferable.

[0060]

As described above, the radiator of the present invention can reduce the fin thickness and fin pitch and the bottom plate as compared with the extruded product, so that the performance can be greatly increased and the weight can be reduced. It is. Moreover, since it is superior in mass productivity as compared with the conventional thin plate parallel type, it is possible to reduce the manufacturing cost. Therefore, it can be said that it is a very promising radiator as a next-generation high-performance radiator that replaces the extruded product.

[Brief description of the drawings]

FIG. 1 is a perspective view of a radiator showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a radiator showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional plan view of a radiator showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a radiator showing a third embodiment of the present invention.

FIG. 5 is a perspective view of a radiator showing a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional plan view of a radiator showing a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a radiator showing a fifth embodiment of the present invention.

FIG. 8 is a vertical sectional side view of the radiator showing a fifth embodiment of the present invention.

FIG. 9 is a vertical side view of a radiator showing a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 bottom plate 11 concave portion 12 end plate 20 thin plate 21 convex portion 22, 25, 26 bent portion 23 opening portion 24 spacer portion 30 connecting member 40 top plate

Continued on the front page (72) Inventor David Copeland 1-10 Fuso-cho, Amagasaki-shi, Hyogo Sumitomo Precision Industries, Ltd. F-term (reference) 5F036 AA01 BB05 BC06

Claims (7)

[Claims] In a thin plate parallel type radiator in which a number of thin plates are arranged in parallel at a predetermined interval and fixed on a bottom plate, a lower edge portion of each thin plate is bent while leaving a part in the width direction. A radiator, wherein a downwardly projecting portion is formed on a part thereof, and the projecting portion of each thin plate is inserted into a concave portion provided on an upper surface of the bottom plate, and a bent portion is brazed to the upper surface of the bottom plate. 2. The radiator according to claim 1, wherein the recess is formed by a slit penetrating between both surfaces of the bottom plate. 3. A thin plate parallel type radiator in which a number of thin plates are arranged in parallel at a predetermined interval and fixed on a bottom plate, a part of each thin plate excluding at least an edge portion is protruded from the plate surface. A radiator comprising: one or a plurality of formed protrusions; and a plurality of thin plates arranged in parallel using the protrusions as spacers. 4. The radiator according to claim 3, wherein the projecting portion is formed by projecting a part or the whole of an opening provided in the thin plate from the plate surface. 5. The radiator according to claim 4, wherein the plurality of thin plates are connected to form a unit by a connecting member penetrating the plurality of thin plates and inserted into each opening. 6. The radiator according to claim 3, wherein the lower edge of each thin plate is bent and joined to the upper surface of the bottom plate. 7. The radiator according to claim 3, wherein an upper edge portion of each thin plate is bent, and a top plate is joined on the bent portion.