JP3181915U - Radiator - Google Patents

Abstract

An object of the present invention is to provide an inexpensive radiator that improves the degree of adhesion of a heat pipe to a groove of a substrate.
A heat radiator (1) includes a substrate (2) having a groove (3) opened to a lower surface portion (21) side, a heat pipe (5) press-fixed to the groove (3) in a shape corresponding to the shape of the groove (3), A plurality of radiating fins 6 are provided on the upper surface portion 22 of the substrate 2 at intervals, and the groove portion 3 has groove side wall portions 3a and 3a and a groove bottom portion 3b, and both groove side wall portions 3a. , 3a are provided with serrations 4 alternately having convex portions 41 formed along the length direction of the groove portions 3 and concave portions 42 formed along the length direction of the groove portions 3.
[Selection] Figure 1

Description

  The present invention relates to a radiator that is used for cooling semiconductor elements that generate heat when used, such as transistors, LSIs, and microprocessors, and more particularly to a radiator that uses a heat pipe.

  There are various types of heat radiators that dissipate heat from a semiconductor element. Conventionally, in order to improve the thermal characteristics of a heat radiator, those using a heat pipe are widely known (for example, Patent Document 1). , 2).

  Here, FIG. 4A shows an example of a radiator using a conventional heat pipe. As shown in FIG. 4A, the radiator 100 is erected on the substrate 102 in which a plurality of grooves 103 having a substantially U-shape in cross section, which are recessed in the one surface portion 121, are formed, and on the other surface portion 122 of the substrate 102. The plurality of heat radiation fins 106 and the plurality of heat pipes 105 fixed in the groove 103 are provided. In FIG. 4A, the radiator 100 is illustrated with the substrate 102 side facing up. The radiator 100 has a straight pipe heat pipe 105 inserted into the groove portion 103, and a portion protruding from the groove portion 103 of the heat pipe 105 is caulked to the bottom side of the groove portion 103, whereby the heat pipe 105 is connected to the groove portion 103. It is fixed in close contact with.

Utility Model Registration No. 3138847 JP 2009-270750 A

However, such a conventional radiator 100 still has room for improvement.
For example, if the material forming the substrate 102 of the radiator 100 shown in FIG. 4 (a) is originally warped or twisted, an impact or vibration is applied to the radiator 100 during transportation or use. In some cases, warpage or twist of the substrate 102 increases, and the substrate 102 bends in the outward direction of the radiator 100. Furthermore, after the heat pipe 105 is caulked and fixed to the groove 103, the heat sink 100 may be subjected to processing such as clamping, which may increase warpage or twist of the substrate 102.
As shown in FIG. 4B, the substrate 102 may bend in this manner, so that the opening portion of the groove 103 formed in the substrate 102 may open outward in the groove 103. It was. Further, when the substrate 102 is bent, the groove 103 may be twisted or distorted, and the degree of adhesion of the heat pipe 105 to the substrate 102 (groove 103) groove 103 may be reduced.

  On the other hand, it is also conceivable to improve the degree of adhesion of the heat pipe 105 to the substrate 102 (groove 103) by soldering or bonding. However, it is required to reduce the manufacturing cost as much as possible, and reduction of manufacturing processes, reduction of the number of parts, saving of equipment costs, and the like are important issues. Therefore, it is desirable that the degree of adhesion of the heat pipe 105 to the groove 103 can be ensured without performing a process such as soldering or bonding.

  Therefore, an object of the present invention is to provide an inexpensive radiator that improves the degree of adhesion of the heat pipe to the substrate.

  The present invention has been made in view of the above-described problems, and a radiator according to the present invention includes a pair of groove side walls and a groove bottom provided between the pair of groove side walls on one surface side. A substrate having a groove portion having a groove opening on the one surface side, and a heat pipe press-fixed to the groove portion in a shape corresponding to the shape of the groove portion, wherein the groove portion is one or both of The heat pipe having convex portions formed along the length direction of the groove portions and concave portions formed along the length direction of the groove portions alternately in the depth direction of the groove portions. It is characterized by providing the serration part.

  According to such a configuration, the heat dissipator includes a serration portion in which one or both of the groove side walls are alternately provided with concave portions and convex portions formed along the length direction of the groove portion. When the is pressed, a part of the heat pipe is deformed along the uneven shape of the serration part, so that a part of the heat pipe can be engaged with the serration part. Thereby, the movement of the up-down direction within the groove part of a heat pipe is stopped. Therefore, in the heat radiator, even when the material forming the substrate is warped or twisted, the heat pipe is stably held in the groove. In this way, the heat radiator can be firmly caulked and fixed by closely contacting the heat pipe with the groove portion without performing a process such as soldering or bonding.

Further, in the radiator according to the present invention, the serration portion is such that the top portion of the convex portion is substantially flush with the groove side wall portion, and the top portion of the concave portion is closer to the groove portion than the groove side wall portion. It may be in a position recessed in the outward direction.
Further, in the radiator according to the present invention, the serration portion is such that the top portion of the convex portion protrudes inward of the groove portion from the groove side wall portion, and the top portion of the concave portion is the top portion of the convex portion. It may be in a position that is recessed toward the groove side wall. In addition, since the position of the top part of a recessed part should just be in the position dented in the outer direction of the groove part rather than the top part of a convex part, it may be between the top part of a convex part and a groove side wall part, and is substantially the groove side wall part. It may be in a position that is flush with it, or may be in a position that is recessed to the outside of the groove part rather than the side wall part of the groove. According to this, the heat radiator can narrow the groove opening partly by providing the convex part of the serration part at the position protruding inward of the groove part on the groove side wall part of the groove part. Can be more reliably prevented from separating from the groove.

  Further, in the radiator according to the present invention, the groove has a width formed on the groove bottom side smaller than a width formed on the groove opening side.

  According to such a configuration, the heat radiator has a groove formed on the bottom side of the groove that is smaller than the width formed on the groove opening side. It becomes easier to be deformed according to the shape of this, and thereby the degree of adhesion to the groove portion of the heat pipe can be further improved.

  In the radiator according to the present invention, one side or both sides of the groove portion of the substrate are caulked along the groove portion.

  According to such a configuration, since the radiator is caulked on one side or both sides of the groove portion along the groove portion, the groove side wall portion of the groove portion is pressed inward in the width direction of the groove portion. . Therefore, the heat radiator can make the heat pipe more closely contact with the groove side wall portion of the groove portion, and can more reliably prevent the heat pipe from separating from the groove portion. Furthermore, the radiator can partially improve the rigidity of the substrate by caulking one or both sides of the groove portion along the groove portion of the substrate, thereby eliminating the deflection of the substrate. .

  The radiator according to the present invention is formed in the groove sidewall so that the ratio of the serration portion to the depth from the groove opening to the groove bottom is 1/3 or more and 1/2 or less. It was decided that

  According to such a configuration, the radiator is formed on the groove sidewall so that the ratio of the serration portion to the depth from the groove opening to the groove bottom is 1/3 or more and 1/2 or less. The heat pipe can be deformed in accordance with the shape of the groove with an appropriate pressing force. In addition, since the serration part is formed at a position higher than ½ of the depth from the groove opening to the groove bottom, the radiator can be easily processed from the groove opening side. Formation becomes easy.

  Further, in the radiator according to the present invention, the substrate includes a plurality of radiating fins standing on the one surface side or the other surface side at intervals.

  According to such a configuration, the radiator includes the plurality of heat dissipating fins standing on the one surface side or the other surface side at intervals, so that the heat transmitted from the heat source to the substrate is transmitted from the substrate. The heat can be transmitted to the plurality of heat radiating fins and radiated from the plurality of heat radiating fins into the air.

According to the radiator of the present invention, even when the material forming the substrate is warped or twisted, the heat pipe can be pressed and fixed in a shape corresponding to the shape of the groove portion. The degree of adhesion with the groove of the substrate can be improved. Thereby, the adhesion degree of a heat pipe and a board | substrate can be improved and the thermal conductivity of a heat radiator can be improved. Moreover, since it is not necessary to perform processes, such as solder and adhesion | attachment, in order to fix a heat pipe to the groove part of a board | substrate, a radiator can reduce the manufacturing cost of a radiator.
Furthermore, a heat radiator can improve heat dissipation efficiency more by providing the radiation fin by which a board | substrate equips with a space | interval on one surface side or the other surface side.

It is a figure for demonstrating the whole structure of the heat radiator which concerns on 1st Embodiment of this invention, (a) is a vertical sectional view of the heat radiator which concerns on 1st Embodiment, (b) is (a) It is an enlarged view of a groove part when the heat radiator shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the vertical sectional view which showed the heat radiator which concerns on 1st Embodiment of this invention with the board | substrate side up, and is a conceptual diagram which shows a mode that a heat pipe is fixed to the groove part of a board | substrate in steps. It is the vertical sectional view which showed the whole structure of the heat radiator which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the whole structure of the conventional heat radiator, (a) is a vertical sectional view of the conventional heat radiator, (b) is a distortion and a twist in the groove part of the heat radiator shown to (a). It is a conceptual diagram which shows a mode that has arisen.

<First Embodiment>
Next, a radiator according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the following description, the vertical and horizontal directions are assumed to be the same as the direction of the paper.
As shown in FIG. 1A, the radiator 1 includes a substrate 2 and a plurality of concave portions provided along the depth direction of the substrate 2 on one surface side (here, the lower surface portion 21) of the substrate 2. A plurality of grooves 3, a heat pipe 5 that is press-fixed to any groove 3 among the plurality of grooves 3, and one surface or the other surface (here, the upper surface 22) of the substrate 2 are provided with a space therebetween. The thin-plate-like heat radiation fin 6 is mainly provided. As shown in FIG. 1A, the heat radiator 1 has a heat source H in contact with the lower surface portion 21 of the substrate 2. The heat source H is, for example, a heat generator such as a CPU (Central Processing Unit) in a PC (Personal Computer).
In the following, the heat pipe is indicated as “heat pipe 5” before and after being fixed to the groove 3 by pressure contact, but the heat pipe 5 after being fixed to the groove 3 is registered as a utility model. It corresponds to the “heat pipe” in the claims.

  Here, the substrate 2 is formed in a flat plate shape. The board | substrate 2 can be formed with the raw material excellent in heat conductivity, such as copper, copper alloy, aluminum, or aluminum alloy, for example.

  The groove part 3 fixes the heat pipe 5 to the substrate 2, and as shown in FIG. 1B, a pair of groove side wall parts 3a provided at a predetermined interval, and the pair of groove side wall parts 3a And a groove bottom 3b provided continuously. The groove 3 is continuously formed from one end side to the other end side along the depth direction of the substrate 2.

Here, the groove side wall portion 3a falls in a vertical direction from an opening portion of the groove portion 3 (hereinafter referred to as “groove opening portion 3c”) to a certain depth, and gradually exceeds the certain depth toward the inside of the groove portion 3. Inclined and extended in an arc shape toward the groove bottom 3b. Here, the groove bottom portion 3 b is formed in an arc shape that is recessed in the outer direction of the groove portion 3. The groove portion 3 is formed in a U shape in a sectional view by a pair of groove side wall portions 3a and a groove bottom portion 3b.
Further, the formation width w2 of the groove bottom 3b is smaller than the formation width w1 of the groove opening 3c. Here, the formation width w1 of the groove opening 3c is substantially equal to or slightly larger than the formation width of the heat pipe 5 before being caulked and fixed to the groove 3. Here, the “certain depth” can be, for example, about ½ of the depth d1 of the groove 3.

As shown in FIG. 1 (b), the groove 3 is formed on both groove sidewalls 3a continuously from the groove opening 3c to a predetermined depth along the length direction of the groove 3. The serration part 4 which has the part 41 and the recessed part 42 alternately is provided.
As shown in FIG. 1B, the serration portion 4 has a convex portion 41 and a concave portion 42 formed in an arc shape here. The convex portion 41 is at a position where the top portion thereof is substantially flush with the groove side wall portion 3 a, and the concave portion 42 is located at a position where the top portion is recessed toward the outer side of the groove portion 3 relative to the groove side wall portion 3 a. In addition, the top part of the convex part 41 is a part located most inside the groove part 3 in the convex part 41, and the top part of the concave part 42 is a part located most outside the groove part 3 in the concave part 42. The serration portion 4 meshes with a part of the heat pipe 5 when a heat pipe 5 to be described later is press-fitted and fixed in the groove portion 3.

  The formation width of the convex portion 41 and the concave portion 42 of the serration portion 4, that is, the width in the depth direction of the groove portion 3 can be set as appropriate. In addition, if the formation width of the convex part 41 and the concave part 42 of the serration part 4 is set so that the number of combinations of the convex part 41 and the concave part 42 of the serration part 4 is 2 or more, the serration part 4 has the heat pipe 5 When a part is engaged, a sufficient engagement force acts between the serration portion 4 and the heat pipe 5, which is preferable because the heat pipe 5 can be fixed well.

  For example, the serration portion 4 is preferably formed in the groove side wall portion 3a so that the ratio of the depth from the groove opening portion 3c to the groove bottom portion 3b is 1/3 or more and 1/2 or less. When the ratio of the depth from the groove opening 3c to the groove bottom 3b is less than 1/3, the range in which the heat pipe 5 meshes with the serration 4 is reduced, so that there is a possibility that it cannot be sufficiently fixed. On the other hand, when the ratio of the depth from the groove opening 3c to the groove bottom 3b is more than ½, it is difficult to deform the heat pipe 5 into a shape that matches the shape of the serration portion 4. As a result, the contact area between the heat pipe 5 and the serration unit 4 is reduced, and the heat dissipation characteristics of the radiator 1 may be deteriorated.

  In the serration portion 4, the protrusion height of the protrusion 41 and the depth of the recess 42 are preferably about 0.1 to 1.0 mm. According to this, when a part of the heat pipe 5 is engaged with the serration unit 4, a sufficient meshing force works between the serration unit 4 and the heat pipe 5, and the heat pipe 5 can be fixed well. In addition, the serration portion 4 can be easily formed.

  The heat pipe 5 is for transmitting heat generated by the heat generation source H to a wide range of the substrate 2, and is press-fixed to the groove portion 3 in a shape corresponding to the shape of the groove portion 3. Here, the heat pipe 5 is caulked and fixed to three grooves 3 provided at positions corresponding to positions where the heat source H contacts the lower surface 21 of the substrate 2. Note that the number of the heat pipes 5 can be appropriately changed according to the position, area, heat generation amount, etc. of the heat source H. The method for press-fixing the heat pipe 5 to the groove portion 3 is not particularly limited, and a general press-contact method such as caulking can be appropriately selected.

  The heat pipe 5 is formed of a material having excellent thermal conductivity, such as copper, copper alloy, aluminum, or aluminum alloy. As such a heat pipe 5, a known wick type or thermosiphon type can be suitably used. Further, the heat pipe 5 has a straight tube shape, and although not shown, both end portions are closed in a flat shape, the working fluid is vacuum-sealed inside, and the both end portions are in a state before being pressed and fixed to the groove portion 3. The portion other than is a shape conforming to a known heat pipe such as a circular shape in cross-sectional view or a flat shape in cross-sectional view.

As shown in FIG. 2 (a), the heat pipe 5 is in a state before being pressed and fixed to the groove portion 3, where the portions other than both end portions are formed in a circular tube, and the outer diameter r is It is formed to be substantially equal to or slightly smaller than the formation width w1 of the groove opening 3c of the groove 3 and larger than the depth d1 of the groove 3.
Further, the heat pipe 5 preferably has a volume larger than the volume of the groove 3. With this setting, the heat pipe 5 can be deformed and brought into close contact with the groove portion 3 in accordance with the shape of the groove portion 3 with a smaller pressing force. The heat pipe 5 is formed so that the length is substantially equal to the length of the groove portion 3. Further, the heat pipe 5 is preferably provided with Ni plating on the surface in order to prevent electrolytic corrosion.

  Again, as shown in FIG. 1A, the heat radiating fin 6 radiates heat transferred from the substrate 2 into the air. Here, the metal thin plate erected on the upper surface portion 22 of the substrate 2. It is a shaped member. Here, the radiating fins 6 are formed integrally with the substrate 2. The installation interval and thickness of the radiation fins 6 can be set as appropriate.

  The substrate 2 described above is obtained by, for example, extruding a metal plate made of a material having excellent thermal conductivity such as copper, copper alloy, aluminum, or aluminum alloy, so that the groove portion 3 is formed on the lower surface portion 21 (one surface side). A plurality of serrations 4 are provided in a recessed manner at intervals, and a plurality of heat dissipating fins 6 are provided on the upper surface 22 (on the other surface side) at an interval and cut into a desired length. Can do. After forming the groove 3 by extrusion, the serration portion 4 presses a predetermined amount of the portion that becomes the recess 42 in the groove side wall portion 3a toward the outside of the groove 3, so that the protrusion 41 and the recess 42 are simultaneously formed. Can be formed. In this way, by forming the substrate 2 and the heat radiating fins 6 integrally by extrusion processing, the vibration resistance of the heat radiating fins 6 is improved, so that the heat radiating fins 6 can be effectively damaged by vibration during use. Can be prevented. For this reason, mounting to a vehicle etc. is also suitable.

Next, with reference to FIGS. 2A to 2D, the manner in which the heat pipe 5 is pressed and fixed to the substrate 2 via the groove 3 will be described. FIGS. 2A to 2D show the case where the heat pipe 5 is press-fixed to the groove portion 3 on the substrate 2 by caulking, step by step.
As shown in FIG. 2A, first, the heat pipe 5 is inserted from above the groove portion 3 and disposed inside the groove portion 3. As described above, since the outer diameter r of the heat pipe 5 is larger than the depth d1 of the groove portion 3, the heat pipe 5 is disposed in the groove portion 3 as shown in FIG. A part of the pipe 5 protrudes outside the groove 3 from the groove opening 3c (see FIG. 1B).

Next, as shown in FIG. 2 (c), the heat pipe 5 is placed on the groove bottom 3b (see FIG. 1 (b)) side by a caulking blade 10 attached to a caulking machine (not shown) with a flat tip. Press on.
At this time, by making the width of the tip of the caulking blade 10 approximately equal to the formation width w1 (see FIG. 2A) of the groove opening 3c of the groove 3 (see FIG. 1B), A pressing force can be applied uniformly to the entire heat pipe 5, and the heat pipe 5 can be favorably deformed in accordance with the shape of the groove 3 with a relatively small pressing force.

Thereby, as shown in FIG.2 (c), the part protruded to the exterior of the groove part 3 of the heat pipe 5 is deform | transformed flatly along the shape of the front-end | tip of the crimping blade 10, and groove | channel side wall part 3a eventually. By being pressed by the serration unit 4 (see FIG. 1B), it is deformed in accordance with the shape of the serration unit 4. At the same time, the heat pipe 5 is pressed toward the groove bottom 3b (see FIG. 1B) by the pressing force from the caulking blade 10, and the portion pressed against the groove bottom 3b (see FIG. 1B) is pressed. It is deformed in accordance with the shape of the groove bottom 3b (see FIG. 1B). Further, due to the reaction force of the groove bottom 3b (see FIG. 1B), the pressing force from the caulking blade 10 causes the groove side wall 3a around the groove bottom 3b (see FIG. 1B) (FIG. 1B). (Refer to FIG. 1B), a part of the heat pipe 5 is pressed against both of the groove side walls 3a (see FIG. 1B), and conforms to the shape of the groove side wall 3a (see FIG. 1B). Is transformed.
In this way, as shown in FIG. 2D, the heat pipe 5 is fixed in close contact with the shape of the groove 3.
In this state, as shown in FIG. 2 (e), the force F exerted on the substrate 2 by the heat pipe 5 which is fixed in close contact with the shape of the groove 3 and the serration portion provided in the groove 3 of the substrate 2. The reaction force F ′ 4 exerts on the heat pipe 5 is balanced. Thus, the heat pipe 5 and the serration part 4 press each other in the groove part 3, and the heat pipe 5 can be stably fixed in the groove part 3. FIG.

  In addition, after the heat pipe 5 is press-fixed to the groove part 3, the process which planarizes the surface of the heat pipe 5 may be performed. According to this, the adhesion degree between the heat generation source H (see FIG. 1A) and the substrate 2 can be further improved.

  The heat radiator 1 configured as described above has at least one heat pipe 5 fixed by caulking and fixing the heat generated by the heat generation source H in the groove portion 3 formed in the lower surface portion 21 of the substrate 2 in contact with the heat generation source H. It tells the whole heat pipe 5 from the location. The radiator 1 transmits heat to the wide area of the substrate 2 by the entire heat pipe 5. The radiator 1 transmits the heat transmitted from the heat pipe 5 by the substrate 2 to the plurality of heat radiation fins 6 erected on the upper surface portion 22 of the substrate 2, and the heat radiation fins 6 transmit this heat. Dissipates heat into the air.

  The radiator 1 is disposed on a heat source H of an electronic board (not shown), and screws (none of them are shown) are inserted through screw holes provided near the outer end of the board 2. It is fixed to an electronic substrate (not shown) by screwing it (not shown).

The radiator 1 according to the first embodiment of the present invention described above has the following excellent effects.
According to the radiator 1, the heat pipe 5 can be fixed in close contact with the groove portion 3 by pressing and fixing the heat pipe 5 according to the shape of the groove portion 3.
Further, according to the radiator 1, a part of the heat pipe 5 meshes with the serration part 4 formed on the groove side wall part 3 a of the groove part 3 and is fixed in close contact with the heat pipe 5. Movement is stopped. Therefore, according to the heat radiator 1, it is possible to reliably prevent the heat pipe 5 from dropping from the groove opening 3 c of the groove 3 even when the material forming the substrate 2 is warped or twisted. it can.

  Furthermore, according to the heat radiator 1, since the heat pipe 5 can be firmly fixed to the groove portion 3 and fixed, the heat pipe 5 is fixed to the groove portion 3 without being subjected to a process such as soldering or bonding. Therefore, the manufacturing process can be simplified and the material cost can be reduced. Therefore, the manufacturing cost of the radiator 1 can be reduced. In addition, resource consumption can be reduced, and the load on the environment can be reduced.

  Furthermore, the heat radiator 1 has a groove portion 3 which is U-shaped in cross section by a pair of groove side wall portions 3a and a groove bottom portion 3b. Can be easily deformed according to the shape of the groove 3. Therefore, the adhesion degree of the groove part 3 and the heat pipe 5 can be improved. Thereby, the thermal resistance of the heat pipe 5 and the board | substrate 2 can be decreased, a heat conductivity can be improved, and the heat dissipation efficiency of the heat radiator 1 can be improved by extension.

  In addition, according to the radiator 1, the heat pipe 5 can be fixed to an arbitrary groove portion 3 among the plurality of groove portions 3, 3... Provided on the substrate 2. The position where the heat pipe 5 is fixed can be appropriately selected according to the position. Thereby, it is not necessary to prepare the heat radiator 1 by the number according to the position of the heat source H, which is economical for the user.

Second Embodiment
Next, a radiator 1A according to a second embodiment of the present invention will be described with reference to FIG. Since the heat radiator 1A according to the second embodiment is different from the heat radiator 1 according to the first embodiment in the configuration of the substrate, the other common components are denoted by the same reference numerals, and overlapped. Description to be omitted is omitted.

  As shown in FIG. 3, the radiator 1A includes a substrate 2A, a plurality of grooves 3 recessed along the depth direction of the substrate 2A on one surface side (here, the lower surface portion 21) of the substrate 2A, and a plurality of grooves 3 Among the groove portions 3, a heat pipe 5 that is press-fixed to an arbitrary groove portion 3 and a thin plate-like heat dissipation that is provided in a plurality at a distance from one surface side or the other surface side (here, the upper surface portion 22) of the substrate 2A. The fin 6 is mainly provided, and one side or both sides of the groove portion 3 in the substrate 2A are caulked along the groove portion 3. Hereinafter, the concave portion formed by caulking the substrate 2A is referred to as a caulking groove portion 7. In addition, although illustration was abbreviate | omitted here, 1 A of heat radiators contact | abut the heat-generation source H (refer Fig.1 (a)) to the lower surface part 21 of the board | substrate 2A.

Here, one caulking groove portion 7 is provided between adjacent groove portions 3. In addition, the caulking groove portion 7 includes a pair of side wall portions 7a and 7a falling in a direction perpendicular to the lower surface portion 21, and a bottom portion 7b provided in parallel with the lower surface portion 21 between the pair of side wall portions 7a and 7a. have. The depth of the caulking groove portion 7 is equal to or less than the depth of the groove portion 3.
The formation width of the caulking groove portion 7 can be set as appropriate within a range smaller than the width between the groove portions 3, but it is desirable to increase the formation width in order to further improve the rigidity of the substrate 2A.

  It is assumed that the caulking groove portion 7 is not formed in the vicinity of the substrate 2A where the heat source H (see FIG. 1A) contacts. When the heat source H (see FIG. 1A) is brought into contact with the surface of the lower surface portion 21 of the substrate 2A, a gap is formed between the caulking groove portion 7 and the heat source H (see FIG. 1A). This is because the contact area between the heat generation source H (see FIG. 1A) and the substrate 2A is reduced due to the formation of the (air layer), and the thermal conductivity is prevented from decreasing. In addition, the contact thermal resistance increases due to the gap, and the temperature of the heat generation source H (see FIG. 1A) may increase. The vicinity where the heat generation source H (see FIG. 1A) abuts on the substrate 2A includes at least a portion where the heat generation source H (see FIG. 1A) abuts on the substrate 2A. , Its surroundings may be included as appropriate.

Such a substrate 2A is formed by, for example, extruding a metal plate made of a material having high thermal conductivity such as copper, a copper alloy, aluminum, or an aluminum alloy, so that the groove portion 3 (and the serration portion 4) are formed on the lower surface portion 21. ) Are recessed at a predetermined interval, and both sides of the groove portion 3 are caulked along the groove portion 3 by a predetermined amount so that the caulking groove portion 7 is recessed, and the heat dissipating fins 6 are provided on the upper surface portion 22 at intervals. A plurality can be formed by standing and cutting to a desired length.
In the caulking groove portion 7, a groove for forming the caulking groove portion 7 (not shown) having a depth and width smaller than that of the caulking groove portion 7 is previously formed on the substrate 2A by extrusion processing. (Not shown) may be formed by caulking with a caulking blade. According to this, it is possible to prevent the heat pipe 5 from falling off with less caulking force.

  According to the heat radiator 1A according to the second embodiment as described above, since both sides of the groove 3 in the lower surface portion 21 of the substrate 2A are caulked along the groove 3, the rigidity of the substrate 2A is partially increased. Can be improved. Therefore, the radiator 1A can eliminate the bending of the substrate 2A toward the outside of the radiator 1A. Therefore, according to the radiator 1 </ b> A, the heat pipe 5 can be more reliably prevented from falling off the groove portion 3.

  Moreover, according to the heat radiator 1A, since both sides of the groove 3 in the lower surface portion 21 of the substrate 2A are caulked along the groove 3, the rigidity of the substrate 2A can be partially improved. Etc. can be further improved. Furthermore, the curvature of the board | substrate 2A at the time of clamping the heat radiator 1A is suppressed, and the adhesiveness to the groove part 3 of the heat pipe 5 can be improved more.

  Furthermore, according to the heat radiator 1A, since both sides of the groove portion 3 on the lower surface portion 21 of the substrate 2A are caulked along the groove portion 3, the groove side wall portions 3a and 3a of the groove portion 3 are located inside the groove portion 3. It is pressed in the direction, that is, the direction in which the groove opening 3c of the groove 3 is narrowed. Thereby, the adhesion degree of the heat pipe 5 fixed in the groove part 3 and the groove part 3 can be improved more.

  As mentioned above, although the heat radiator 1, 1A which concerns on 1st, 2nd embodiment was demonstrated, the heat radiator of this invention is not limited to the content of above-described embodiment, The range which does not deviate from the meaning of this invention. Can be changed as appropriate. Hereinafter, modifications of the radiators 1 and 1A according to the first and second embodiments will be listed.

[Modification]
In the heat radiators 1 and 1A according to the first and second embodiments described above, the heat pipe 5 is formed in a straight tube shape, but is not limited thereto, and is not limited to this, and is U-shaped in plan view, L-shaped in plan view, or planar. You may change suitably, such as a visual O-shape.

  In the radiators 1 and 1A according to the first and second embodiments described above, the serration portion 4 is in a position where the top of the convex portion 41 is substantially flush with the groove side wall portion 3a, and the top of the concave portion 42 is Although it was in the position dented in the outer side direction of the groove part 3 rather than the groove side wall part 3a, it is not restricted to this, The position of the top part of the convex part 41 and the position of the top part of the recessed part 42 may be changed suitably.

For example, in the serration portion 4, the position of the top portion of the convex portion 41 is in a position protruding inward of the groove portion 3 relative to the groove side wall portion 3a, and the position of the top portion of the concave portion 42 is substantially flush with the groove side wall portion 3a. It is good also as being in the position which becomes.
According to this, since the top part of the convex part 41 of the serration part 4 protrudes inward of the groove part 3 from the groove side wall part 3a, the vicinity of the groove opening part 3c of the groove part 3 is narrowed by the protrusion amount. Therefore, the movement of the heat pipe 5 in the vertical direction in the groove 3 can be restrained, and the heat pipe 5 can be more firmly and firmly fixed to the groove 3.

Further, for example, in the serration portion 4, the position of the top portion of the convex portion 41 is in a position protruding inward of the groove portion 3 from the groove side wall portion 3 a, and the position of the top portion of the concave portion 42 is the same as the top portion of the convex portion 41. Further, it may be located between the groove side wall 3a.
According to this, the top part of the convex part 41 of the serration part 4 and the top part of the concave part 42 protrude inward of the groove part 3 from the groove side wall part 3a, so that the vicinity of the groove opening 3c of the groove part 3 protrudes. Therefore, the movement of the heat pipe 5 in the groove 3 in the vertical direction can be restrained, and the heat pipe 5 can be firmly fixed by the groove 3.

Furthermore, for example, in the serration portion 4, the position of the top portion of the convex portion 41 is in a position protruding inward of the groove portion 3 relative to the groove side wall portion 3 a, and the position of the top portion of the concave portion 42 is greater than that of the groove side wall portion 3 a. It is good also as being in the position dented in the outer side direction of the groove part 3. FIG.
According to this, since the meshing amount of the heat pipe 5 and the serration portion 4 can be increased, the heat pipe 5 can be firmly fixed by the groove portion 3 and fixed.

  The serration part 4 has the protrusion height of the protrusion 41 and the depth of the recess 42 as described above when the position of the top of the protrusion 41 protrudes inward of the groove 3 from the groove side wall 3a. And the ratio of the protrusion amount of the protrusion 41 from the groove side wall 3a in the formation width w1 of the groove opening 3c is 1/6 or less. Is preferred. This is because if the ratio of the protruding amount is larger than 1/6, the groove opening 3c becomes too narrow and it is difficult to insert the heat pipe 5 that matches the size of the groove 3. In addition, this ratio can be made equal by the case where the serration part 4 is provided in one side of the groove | channel side wall part 3a, and the case where both are provided.

  Further, for example, the position of the top portion of the convex portion 41 and the position of the top portion of the concave portion 42 may be changed for each formation position in the serration portion 4. For example, in the serration part 4, in the vicinity of the groove opening 3c, the position of the top of the convex part 41 is in a position protruding inward of the groove part 3 from the groove side wall part 3a, and the position of the top of the concave part 42 is It is assumed that it is in a position that is recessed in the outer direction of the groove part 3 from the groove side wall part 3a, and in the remaining part, the position of the top part of the convex part 41 is a position that protrudes inward of the groove part 3 from the groove side wall part 3a. Yes, the position of the top of the recess 42 may be substantially flush with the groove sidewall 3a.

  According to this, the deformation amount of the heat pipe 5, that is, the meshing amount between the heat pipe 5 and the serration unit 4 can be changed according to the place. For example, in the vicinity of the groove opening 3c, by increasing the deformation amount of the heat pipe 5 (meshing amount of the heat pipe 5 and the serration portion 4), in other parts by reducing the deformation amount of the heat pipe 5, It is possible to effectively suppress the heat pipe 5 from falling off the groove portion 3 with an appropriate caulking force.

  Further, for example, the serration portion 4 may be formed by appropriately combining the above-described example of the position of the top of the convex portion 41 and the example of the position of the top of the concave portion 42.

In the radiators 1 and 1A according to the first and second embodiments described above, the convex portion 41 and the concave portion 42 of the serration portion 4 are each formed in an arc shape in cross section. It may be a triangular shape, a rectangular shape, a tapered shape whose diameter decreases toward the inner side in the width direction of the groove portion 3, or the like.
In the radiators 1 and 1A according to the first and second embodiments described above, the serration portion 4 is provided on both the groove side wall portions 3a of the groove portion 3, but the present invention is not limited to this, and either one of the groove side walls. You may provide only in the part 3a.

  In the radiators 1 and 1A according to the first and second embodiments described above, the substrates 2 and 2A are each formed in a flat plate shape, but the shape of the substrates 2 and 2A is not particularly limited. For example, the end portions of the substrates 2 and 2 </ b> A may be bent in the vertical direction and provided with outer wall portions (not shown) that extend along the radiation fins 6. It is preferable that the height of the outer wall (not shown) is substantially equal to or slightly larger than the height of the radiating fins 6 fixed to the radiator 1. According to this, the outer wall portion (not shown) can effectively prevent the heat dissipating fins 6 from interfering with other members due to vibration during transportation, etc. Strength can be improved.

  In the radiators 1 and 1A according to the first and second embodiments described above, the radiating fins 6 are formed integrally with the substrates 2 and 2A. However, the present invention is not limited thereto, and may be separated. Moreover, the shape of the radiation fin 6 can be changed as appropriate. The method of fixing the radiation fin to the substrate when the radiation fin is formed separately from the substrate can be appropriately selected. For example, when the radiating fin is formed in a U-shaped cross-sectional view as a separate body from the substrate, a fin fixing groove for fixing the radiating fin is provided between the groove portions of the substrate, and the bottom of the radiating fin is fixed to the fin. The shape may be fixed in accordance with the shape of the groove. Further, for example, the radiating fin may be separated from the substrate, and the radiating fin may be fixed on the heat pipe with an adhesive or the like.

  In the radiators 1 and 1A according to the first and second embodiments described above, the groove portion 3 is provided on the lower surface portion 21 (the side where the radiation fins 6 are not provided) of the substrates 2 and 2A. Instead, the groove portion 3 may be provided on the upper surface portion 22 (the side where the radiation fins 6 are provided) of the substrates 2 and 2A.

  In the heat radiator 1A according to the second embodiment described above, the caulking groove portion 7 has a pair of side wall portions 7a and 7a falling in a direction perpendicular to the lower surface portion 21, and the lower surface portion 21 and the pair of side wall portions 7a and 7a. However, the present invention is not limited to this, and for example, it may be V-shaped in cross-sectional view or U-shaped in cross-sectional view. Further, in the radiator 1A according to the second embodiment described above, the caulking groove portion 7 is provided on the substrate 2A on both sides of the groove portion 3, but the present invention is not limited to this, and only the substrate 2A on one side of the groove portion 3 is provided. It may be provided.

1,1A Heatsink 2,2A Substrate 21 Lower surface (one side)
22 Upper surface (other side)
3 Groove 4 Serration 5 Heat Pipe 6 Radiation Fin 7 Caulking Groove H Heat Source

Claims (7)

On one surface side, a substrate formed by a pair of groove sidewall portions and a groove bottom portion provided between the pair of groove sidewall portions, and having a groove portion having a groove opening on the one surface side,
A shape conforming to the shape of the groove, and a heat pipe that is pressure-fixed to the groove, and
The groove portion includes, on one or both of the groove side wall portions, a convex portion formed along the length direction of the groove portion and a concave portion formed along the length direction of the groove portion in the depth direction of the groove portion. A heat radiator characterized by comprising serration portions alternately disposed on the heat sink.   The serration portion is such that the top portion of the convex portion is substantially flush with the groove side wall portion, and the top portion of the concave portion is in a position recessed toward the outer side of the groove portion from the groove side wall portion. The heat radiator according to claim 1.   In the serration portion, the top of the convex portion is in a position protruding inward of the groove portion from the groove side wall portion, and the top portion of the concave portion is recessed in the groove side wall portion direction from the top portion of the convex portion. The heat radiator according to claim 1, wherein the heat radiator is in a position.   4. The radiator according to claim 1, wherein the groove has a width formed at the bottom of the groove that is smaller than a width formed at the groove opening. 5.   5. The radiator according to claim 1, wherein one or both sides of the groove portion of the substrate are caulked along the groove portion.   The serration portion is formed in the groove sidewall so that a ratio of a depth from the groove opening to the groove bottom is 1/3 or more and 1/2 or less. The heat radiator as described in any one of Claim 5.   The radiator according to any one of claims 1 to 6, wherein the substrate includes a plurality of heat dissipating fins standing on the one surface side or the other surface side at intervals.

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