JPH1117078A - Radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiator which can be efficiently manufactured and improve a thermal transmission ability from fin parts. SOLUTION: First thin plate members 2, 6 made by blanking and having a base part and fin parts extended from the base part as well as a second thin plate member 10 having only a base part are stacked as mixed by a plurality of numbers in their thickness direction, and the adjacent thin plate members 2, 6 and 10 are caulked as coupled one another to form an integrated laminate. Since the first thin plate members 2, 6 having the fin parts and the second thin plate member 10 having no fin part are mixedly stacked, spaces where no fin parts are present are defined in the second thin plate member 10 of the laminate, whereby surfaces of the fin parts to be contacted with a cooling medium can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator which is attached to a heating element such as a semiconductor element to dissipate heat generated in the heating element to the outside.

[0002]

2. Description of the Related Art Generally, a radiator of a semiconductor device has a structure in which a radiating fin is provided on a base plate. The radiating fin and the base plate are manufactured separately, and these are brazed, soldered, and so on. Formed by fitting (fixing or press-fitting), or by extruding the radiating fin and base plate integrally, Extruded fin cut on the surface of the extruded material, grinding with a multi-wire saw It is known that the fin and the base plate are integrally formed by processing.

[0003] In recent years, the integration of semiconductor elements has been advanced, and the amount of heat generated by the semiconductor elements has also increased. Accordingly, a radiator having a high heat radiation amount has been demanded to cope with this.

Conventionally, a radiator disclosed in Japanese Patent Application Laid-Open No. 7-318282 is known as a radiator having such a high heat radiation amount. As shown in FIG. 8 and FIG.
Numeral 01 is formed by laminating a number of comb-shaped thin plate members 102 each having a rectangular base 103 and fins 104 extending upward from the base 103. Since this thin plate member 102 is obtained by punching a plate material by a press device, there is no restriction on the processing of the length dimension of the fin portion 104, and as a result, the length of the fin portion 104 can be increased, and the heat radiation amount can be reduced. It can be higher.

[0005] Further, a caulking portion 105 is provided on the base 103 of each thin plate member 102, and the laminated thin plate members 102 adjacent to each other are connected by the caulking portion 105 to be integrated. The caulking portion 105 is formed by press working, and includes a concave portion formed on one surface of the base portion 103 of the thin plate member 102 and a convex portion formed on the opposite surface, and the convex portion of one thin plate member 102 is adjacent to this. Then, the two thin plate members 102 are connected by being press-fitted into the concave portions of the other thin plate member 102. In this way, the laminated thin plate members 102 are connected to each other by the caulking portion 105, and integrated as a whole laminate.

As described above, the radiator 101
Is a thin plate member 1 comprising a base 103 and a fin 104
02 is formed by press working, and then laminated and connected, and its production efficiency is high.

[0007]

Generally, in order to improve the heat transfer of the fins 104, the pressure loss when the cooling medium passes through the fins 104 is minimized and the total surface area of the fins 104 is reduced. It is necessary to increase.

However, in the above-described conventional radiator 101, since the thin plate members 102 punched in the same shape are laminated in the thickness direction, the front and back surfaces of the fin portions 104 are formed by the fins of the adjacent thin plate members 102. It is in contact with the part 104 and is not placed in contact with the cooling medium.
As described above, in the radiator 101, it is difficult to say that the surface of the fin portion 104 that can come into contact with the cooling medium is necessarily formed efficiently. If the radiator 101 having such a structure is used to cool a semiconductor element that generates a higher amount of heat, the length of the fin portion 104 needs to be further increased. Would be contrary to.

[0009] The present invention has been made to solve the disadvantages of the conventional radiator, and can be efficiently produced.
Moreover, an object of the present invention is to provide a radiator having improved heat transfer from the fin portion.

[0010]

According to a first aspect of the present invention, there is provided a thin plate member formed by stamping and laminating a plurality of thin plate members in a thickness direction thereof. In a radiator in which the members are connected by caulking connection and the laminated thin plate members are integrated, the thin plate member includes a base portion and a first thin plate member including a fin portion extending from the base portion, The first thin plate member and the second thin plate member are mixed and laminated and integrated together with a second thin plate member consisting only of a base.

According to the present invention, the first fin portion is provided.
And the second thin plate member without fins are mixed and laminated, so that a space without fins is formed at the second thin plate member of the laminate, and cooling is performed in this space. The surface of the fin portion in contact with the medium is secured. Therefore, as compared with the above-described conventional radiator, the surface area of the fin portion in contact with the cooling medium can be increased, and the heat transfer property can be improved.

Further, according to the present invention, the first laminated body is provided.
By appropriately adjusting the number of the second thin plate members interposed between the thin plate members, it is possible to arbitrarily set the arrangement interval of the first thin plate members in the stacking direction. By adjusting, the pressure loss of the cooling medium passing between the fin portions can be made as small as possible.

According to a second aspect of the present invention, a plurality of stamped and formed thin plate members are laminated in the thickness direction, and the mutually adjacent thin plate members are connected by caulking and joining. In the radiator integrated, the thin plate member is formed of a thin plate member including a base and a fin extending from the base, and a plurality of the thin plate members having different fin lengths are laminated to form a single row. The thin plate members in one row are further laminated and integrated in a plurality of rows.

According to the present invention, since a plurality of thin plate members having different fin lengths are laminated, of the cross section taken in the laminating direction, the fin cross-sectional area of the portion near the base of the laminated body is reduced. The sum is larger than the total cross-sectional area at the fin tip. In general, it is known that the fin efficiency is improved by increasing the cross-sectional area at the root of the fin and decreasing the cross-sectional area toward the tip end. Can have a large cross-sectional area and a small cross-sectional area at the end thereof, so that a radiator with high fin efficiency can be obtained.

According to a third aspect of the present invention, the thin plate member according to the second aspect of the present invention is laminated with a thin plate member consisting of only a base portion. According to the present invention, a space where no fin portion exists is formed in the laminate by the thin plate member including only the base portion, and the surface area of the fin portion in contact with the cooling medium can be increased. Therefore, the fin efficiency can be improved, and the heat transfer property of the fin portion can be improved. Further, similarly to the invention according to claim 1, by appropriately adjusting the number of thin plate members including only the base portion, the arrangement interval in the stacking direction of the thin plate members having the fin portions can be arbitrarily set. The pressure loss of the cooling medium passing between the fin portions can be made as small as possible by appropriately adjusting the arrangement interval.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a connecting pin penetrating the base of each laminated thin plate member is provided, and both ends of the connecting pin are provided on both outer surfaces of the laminated body. It is characterized by fastening.

According to the present invention, the laminate is firmly held by the connecting pins. Therefore, even when the laminated body receives an external force in the laminating direction, the laminated state is maintained by the pinching force of the connecting pin, and the laminated body is prevented from being separated by the external force. As described above, according to the present invention, since the stacked bodies are connected by the connecting pins together with the caulking connection, the stacked bodies are further firmly connected and integrated.

According to a fifth aspect of the present invention, a flat plate is joined to the base bottom surface of the laminated thin plate member according to the first to fourth aspects of the present invention.

In some cases, the bottom surface of the base of the thin plate member formed by punching and laminating is difficult to be a completely smooth surface in view of the processing accuracy. When the base bottom having such irregularities is attached to the heat source, the heat conductivity from the heat source to the radiator deteriorates due to poor adhesion between the heat source and the base bottom, and the heat radiation efficiency of the radiator deteriorates. According to this invention, the flat plate is joined to the base bottom surface, and by attaching this flat plate to the heat source, the heat source and the radiator can be attached in close contact with each other, so that the heat conductivity from the heat source to the radiator can be improved. And the heat radiation efficiency of the radiator can be increased.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

(First Embodiment) FIG. 1 is a perspective view showing a radiator according to the present embodiment, and FIG. 2 is a front view showing members constituting the radiator.

As shown in FIG. 1 and FIG.
Has a structure in which a first comb-shaped member 2, a second comb-shaped member 6, a first rectangular member 10 and a second rectangular member 13 are formed by stamping a thin plate by pressing. The material of the thin plate as a material is not particularly limited, and examples thereof include materials having excellent thermal conductivity, such as aluminum, aluminum alloys, copper, and copper alloys. The radiator 1 is attached to the heat source by a clip, a screw, or the like so that the lower surface 1a contacts the heat source such as a semiconductor.

As shown in FIGS. 2A and 2B, the first comb-shaped member 2 has a rectangular base 3 and a plurality of fins 4 extending upward from the base 3 at predetermined intervals. The second comb-shaped member 6 is formed as a whole in a comb shape.
Similarly, a rectangular base 7 and a plurality of fins 8 extending upward from the base 7 at predetermined intervals are provided, and are formed in a comb shape as a whole. These are formed so that the length of the fin 8 of the second comb-shaped member 6 is shorter than the length of the fin 4 of the first comb-shaped member 2. Also, as shown in FIGS. 3C and 3D, the first rectangular member 1
Reference numeral 0 denotes a rectangular base 11, and the second rectangular member 1
3 also comprises a rectangular base 14.

The caulking portion 5 is provided at the base 3 of the first comb-shaped member 2, the base 7 of the second comb-shaped member 6 and the base 11 of the first rectangular member 10, and the caulking portion 1 is provided at the base 14 of the second rectangular member 13.
5 are formed at the same positions by press working. FIG. 3A shows a caulking portion 5 provided on the base 3 of the first comb-shaped member 2. As shown in FIG. 3A, the caulking portion 5 has a concave portion 5 a formed on one surface of the base portion 3 and a concave portion 5 a. The protrusions 5b are formed on the opposite surface, and are formed by incomplete punching of press working so that the outer dimensions of the protrusions 5b are slightly larger than the inner dimensions of the recesses 5a. FIG. 3B shows a caulking portion 15 provided on the second rectangular member 13. As shown in FIG. 3B, the caulking portion 15 has the same size as the inner size of the recess 5 a of the caulking portion 5. The through hole 15a has an inner dimension, and is formed by complete punching of press working.

The radiator 1 is obtained by sequentially laminating the first rectangular member 10, the first comb-shaped member 2, and the second comb-shaped member 6 in this order, and finally laminating the second rectangular member 13.
In the manufacture thereof, a punching die for punching each of the first comb-shaped member 2, the second comb-shaped member 6, the first rectangular member 10, and the second rectangular member 13 while leaving a part of the connecting portion is appropriately arranged in parallel. It can be performed by a sequential feed type press device in which a punching die for punching out the connecting portion and cutting off each member is disposed at a final position.

First, a thin plate of a material is supplied to the press device and is sequentially fed thereto.
The rectangular member 10, the first comb-shaped member 2, and the second comb-shaped member 6 are punched out in this order so that the members are formed in a thin plate.
At the time of this punching, the caulking portion 5 is also formed at the same time.

Next, the connecting portion of the thin plate sequentially fed is punched by a punching die provided at a final position, and the first rectangular member 10, the first comb member 2, and the second comb member 6 are cut off in this order. These are sequentially laminated in a mold and pressed from above. As a result, the convex portion 5b of the caulked portion 5 of the lower layer member is press-fitted into the concave portion 5a of the caulked portion 5 of the upper layer member, and the lower layer member and the upper layer member are sequentially connected.

After laminating the first rectangular member 10, the first comb-shaped member 2 and the second comb-shaped member 6 in a predetermined number, and finally punching out the connection portion as in the above, leaving the connecting portion, the caulking portion 15
The second rectangular member 13 formed as described above is punched out by a punching die at the final position, laminated in the die, and pressed from above. As a result, the convex portion 5b of the caulked portion 5 of the lower member
The rectangular member 13 is press-fitted into the through hole 15a of the caulked portion 15 to connect the two.

Thus, the first rectangular member 10, the first comb-shaped member 2, the second comb-shaped member 6 and the second rectangular member 13 which are stacked are mutually connected and integrally formed by the caulking portions 5, 15 as shown in FIG. Be transformed into The swaged portion 1 of the second rectangular member 13
Since 5 is formed by the through-hole 15a, continuous caulking can be divided in a predetermined laminated state.

FIG. 5 is a side view of the radiator 1 thus manufactured in the direction of arrow B in FIG. As shown in the figure, in the radiator 1, a first comb member 2 and a second comb member 6 are provided with a first rectangular member 10 interposed therebetween, and the first rectangular member 10 serves as a spacer. A gap 16 is formed in the laminating direction of the fin portions 4 and 8, and the fin portions 4 and 8 can contact the cooling medium in the gap 16 portion. Thus, according to the radiator 1, the fins 4,
Since not only the side surface of the radiator 8 but also the surface in the stacking direction can contact with the cooling medium, it is possible to increase the total surface area of the fin portions 4, 8 in contact with the cooling medium as compared with the above-described conventional radiator. Heat transfer can be improved. In addition, since the fin portions 4 and 8 are formed in a pin shape, the flow direction of the cooling medium is not limited to one direction, so that the cooling medium can flow in all directions. Cooling can be promoted by a so-called leading edge effect.

As shown in FIG. 1, the radiator 1 has a first comb-shaped member 2 having a long fin portion 4 and a second comb-shaped member 6 having a shorter fin portion 8 provided in contact with each other. , The fin portion 4 and the fin portion 8 are integrally formed. When this is regarded as one fin, the portion near the root of the fin is formed by the fin portion 4 and the fin portion 8,
The fin has a large cross-sectional area, while the portion close to the tip of the fin comprises only the fin portion 4 and has a small cross-sectional area. It is generally known that the fin efficiency is improved by increasing the cross-sectional area at the root of the fin and decreasing the cross-sectional area toward the tip. Has a large cross-sectional area and a small cross-sectional area at the tip end thereof, resulting in high fin efficiency.

According to the radiator 1, the number of the first rectangular members 10 interposed between the first comb-shaped member 2 and the second comb-shaped member 6 to be laminated is appropriately adjusted, so that the first comb-shaped member Since the arrangement interval of the second and second comb-shaped members 6 in the stacking direction can be arbitrarily set, the pressure loss of the cooling medium passing between the fin portions 4 and 8 is minimized by appropriately adjusting the arrangement interval. Can be something.

In this example, the radiator 1 is formed by laminating the first rectangular member 10 and the second rectangular member 13 having no fins and the first comb member 2 and the second comb member 6 having different fin lengths. Formed, but using another comb-shaped member having a fin portion of a different length from the first comb-shaped member 2 and the second comb-shaped member 6,
The radiator 1 may be formed so that the cross-sectional area of the fin portion becomes smaller gradually as it approaches the tip.

Conversely, when the fin efficiency due to the fin cross-sectional area does not matter, the first rectangular members 10 and the first comb members 2 are alternately or randomly stacked without providing the second comb members 6. The radiator 1 may be formed so as to increase the surface area of the fin portion 4 in contact with the cooling medium and increase the heat radiation efficiency.

The lower surface 1a serving as a mounting surface to a heat source
In the case where the flatness or the like becomes a problem, another plate material may be bonded to the lower surface 1a by brazing or the like. Thereby, the heat source and the radiator 1 can be attached in close contact with each other, and the heat conductivity from the heat source to the radiator 1 can be improved, and the heat radiation efficiency of the radiator 1 can be increased.
If the mounting surface of the heat source radiator 1 is not flat,
The mounting surface of the plate may be processed in advance in accordance with the shape of the mounting surface of the heat source.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view showing a radiator according to the second embodiment, and FIG. 7 is a cross-sectional view taken along a line CC in FIG.

As shown in FIGS. 6 and 7, the radiator 21 according to the second embodiment is configured by providing the connecting pins 22 to the radiator 1 according to the above-described first embodiment. The other configuration is the same as that of the radiator 1. Therefore, members having the same configuration as the radiator 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 6, the radiator 21 includes a first rectangular member 10, a first comb-shaped member 2, and a second
A connecting pin 22 is provided instead of the caulking portion 5 and the caulking portion 15 provided at both ends of the comb-shaped member 6 and the second rectangular member 13.

First, the connecting pins 22 are attached to the first rectangular member 10, the first comb member 2, the second comb member 6 and the second rectangular member 13 at the positions where the caulking portions 5 and the caulking portions 15 at both ends are provided. Through hole 23 with inner dimensions slightly larger than outer dimensions
Are formed at the time of press molding of each member.
The rectangular member 10, the first comb-shaped member 2, the second comb-shaped member 6, and the second rectangular member 13 are stacked, and the other members are connected by other caulking portions 5 and 15.

Thereafter, a connecting pin 22 having a length slightly longer than the dimension of the stacked body in the stacking direction is inserted into the through hole 23,
The both ends are pressed and caulked by a press device or the like, and are fixed to both outer surfaces 24a and 24b of the laminate.

The radiator 1 according to the first embodiment described above
Is connected to each other by a caulking portion 5 and a caulking portion 15, and this connection is achieved by connecting the convex portion 5 b to the concave portion 5 a or the through hole 1.
Since it is made by press-fitting into the 5a, it is weak against the external force in the laminating direction, and when the external force in this direction is received, the fitting state of the swaging portions 5, 15 is disengaged, and there is a disadvantage that the laminated body is separated. According to the radiator 21 according to the second embodiment, the stacked body is firmly held from both ends by the connecting pin 22, and even when the stacked body receives an external force in the stacking direction, the connecting pin 22 The sandwiching force prevents the laminate from separating.

In this example, both ends of the connecting pin 22 are fixed by caulking. However, the connecting pin 22 may be fixed by any method as long as it can hold the laminated body.
It may be fixed by welding, soldering, brazing or the like.

[0043]

As described in detail above, claim 1 of the present invention
According to the invention, the first thin plate member having the fin portion and the second thin plate member having no fin portion are mixed and laminated, so that the fin is provided at the second thin plate member of the laminate. A space is formed in which no part is present, and the surface of the fin part in contact with the cooling medium is secured in this space. Therefore, as compared with the above-described conventional radiator, the surface area of the fin portion in contact with the cooling medium can be increased, and the heat transfer property can be improved.

Also, according to the present invention, the first
By appropriately adjusting the number of the second thin plate members interposed between the thin plate members, it is possible to arbitrarily set the arrangement interval of the first thin plate members in the stacking direction. By adjusting, the pressure loss of the cooling medium passing between the fin portions can be made as small as possible.

According to the second aspect of the present invention, since a plurality of thin plate members having different fin lengths are laminated, the fin section of the section close to the base of the laminate in the cross section taken in the laminating direction. The total area is larger than the total cross-sectional area at the fin tip, so that the fin efficiency of the radiator can be increased.

According to the third aspect of the present invention, a space where no fin portion exists is formed in the laminate by the thin plate member including only the base portion, and the surface area of the fin portion in contact with the cooling medium can be increased. Therefore, the fin efficiency can be improved and the heat transfer property of the fin portion can be improved.

Further, similarly to the first aspect of the present invention, by appropriately adjusting the number of thin plate members including only the base portion, the arrangement interval of the thin plate members having the fin portions in the stacking direction can be arbitrarily set. The pressure loss of the cooling medium passing between the fin portions can be made as small as possible by appropriately adjusting the arrangement interval.

According to the fourth aspect of the present invention, since the stacked body is firmly held by the connecting pins, even when the stacked body receives an external force in the stacking direction, the stacked state is maintained by the holding force of the connecting pins. The external force prevents the laminate from separating. As described above, since the stacked bodies are connected by both the caulking connection and the connecting pins, the stacked bodies are firmly connected and integrated.

According to the fifth aspect of the present invention, since the flat plate is joined to the base bottom surface of the laminated thin plate member, by attaching this flat plate to the heat source, the heat source and the radiator can be attached in close contact. As a result, the thermal conductivity from the heat source to the radiator is improved, and the heat radiation efficiency of the radiator can be increased.

[Brief description of the drawings]

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

FIG. 2 is a front view showing each member constituting the radiator according to the first embodiment.

FIG. 3 is a cross-sectional view showing a caulked portion of each member.

FIG. 4 is a cross-sectional view taken along a line AA in FIG. 1;
It is sectional drawing which shows the connection state of each member.

FIG. 5 is a side view in the direction of arrow B in FIG. 1;

FIG. 6 is a perspective view showing a radiator according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view in the direction of arrows CC in FIG. 5;

FIG. 8 is a perspective view showing a conventional radiator.

FIG. 9 is a front view showing members constituting a conventional radiator.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 radiator 2 first comb-shaped member 3 base 4 fin portion 5 caulked portion 5a concave portion 5b convex portion 6 second comb-shaped member 7 base 8 fin portion 10 first rectangular member 11 base 13 second rectangular member 14 base 15 caulked portion 15a penetrating Hole 16 gap 21 radiator 22 connecting pin 23 through hole

Claims (5)

[Claims] 1. A radiator in which a plurality of stamped and formed thin plate members are stacked in the thickness direction thereof, and the adjacent thin plate members are connected by caulking and joined, and the stacked thin plate members are integrated. In the above, the thin plate member may be a first thin plate member including a base and a fin extending from the base, and a second thin plate including only the base.
A radiator comprising: a first thin plate member and a second thin plate member; and a laminated and integrated one. 2. A radiator in which a plurality of stamped and formed thin plate members are stacked in the thickness direction, and the mutually adjacent thin plate members are connected by caulking, and the stacked thin plate members are integrated. In the above, the thin plate member is composed of a thin plate member including a base portion and a fin portion extending from the base portion, and a plurality of the thin plate members having mutually different fin portion lengths are laminated to form one row, A radiator characterized in that a plurality of thin plate members are further laminated and integrated. 3. The radiator according to claim 2, wherein thin members consisting only of a base portion are mixed and laminated. 4. The connecting pin according to claim 1, further comprising a connecting pin penetrating the base of each laminated thin plate member, and fixing both ends of the connecting pin to both outer side surfaces of the laminated body. Radiator. 5. The radiator according to claim 1, wherein a flat plate is joined to a base bottom surface of the laminated thin plate members.