JP2011086722A - Heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink for efficiently transferring heat between a baseplate and a fin, even when a baseplate and the fin are manufactured by presswork. <P>SOLUTION: The heat sink includes the fin 3 having at least one connection section 5 at one side of the outer periphery of a plate-like body; and the baseplate 2, including an insertion hole 4 formed at a position corresponding to the connection section 5 by presswork. The heat sink is constituted by inserting the connection section 5 into the insertion hole 4, and in the fin 3, a recess 6 which allows a projection 7 generated at an edge of the insertion hole 4 to escape is provided, at a base part of the connection section 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat sink formed by assembling a base plate and fins.

  The heat sink is generally provided with a base portion that contacts a heat source and a plurality of fin portions that protrude from the base portion and dissipate heat transmitted from the base portion. For example, when the base portion and the fin portion are formed of an aluminum material, they are integrally formed by extrusion molding or die casting.

  On the other hand, as shown in FIG. 6, it is also known that a flat base plate 61 and fins 62 are separately formed and assembled. In such a heat sink 60, it is preferable that the heat on the base plate 61 side is efficiently transferred to the fin 62 side after the base plate 61 and the fin 62 are assembled. Therefore, the base plate 61 is formed with the insertion hole 63, while the fin 62 is formed with a protrusion 64 that can be inserted into the insertion hole, and the protrusion is inserted into the insertion hole and assembled, thereby assembling the base plate 61 and the fin 62. The contact area is increased so that heat is efficiently transferred (see, for example, Patent Document 1).

JP 2005-203385 A

  However, when the insertion holes of the flat base plate described above are formed by pressing, protrusions may be generated in the respective insertion holes. For this reason, when the projection is inserted into the insertion hole as it is and assembled, a gap due to the projection is generated between the base plate and the fin, and heat transfer between the base plate and the fin cannot be performed efficiently. In addition, the fins assembled with respect to the base plate are inclined by the protrusions, and there is a possibility that the heat radiation performance may vary.

  The present invention has been made in view of the above-described circumstances, and provides a heat sink that can efficiently transfer heat between the base plate and the fin even when the base plate and the fin are manufactured by press working. Is to do.

  In order to solve the above-described problems, the present invention includes a fin having at least one connecting portion on one side of the outer periphery of a plate-like body, and a base plate having an insertion hole formed by pressing at a position corresponding to the connecting portion. A heat sink constructed by inserting the connection portion into the insertion hole, wherein the fin is provided with a recess at a base portion of the connection portion for escaping a protrusion generated at an edge of the insertion hole. It is characterized by being.

  Moreover, the present invention is characterized in that in the heat sink, the fin includes a claw portion that is in contact with a plane of the base plate at a portion where the connection portion of the one side is not formed.

  Furthermore, the present invention is characterized in that, in the heat sink, the connection portion includes a bent portion that is bent along a direction perpendicular to the plate-like body and inserted into the insertion hole.

  The base plate has a heat receiving surface that comes into contact with the heating element side and a fin side plane to which the fin is attached, and the insertion hole is formed by pressing from the heat receiving surface side to the fin side plane. ing.

  The heat sink according to the present invention includes a fin having at least one connection portion on one side of the outer periphery of the plate-like body, and a base plate having an insertion hole formed by pressing at a position corresponding to the connection portion, and the connection A heat sink constructed by inserting a portion into the insertion hole, and the fin is provided with a recess at the base of the connection portion to escape the protrusion generated at the edge of the insertion hole. Even if a protrusion is generated in the insertion hole of the base plate due to processing, it does not come into direct contact with the fin. Therefore, in the assembled state, there is no gap caused by the protrusion between the base plate and the fin. As a result, heat transfer can be efficiently performed between the base plate and the fins. In addition, it is possible to prevent the fins from being inclined and attached due to the protrusions, so that variations in the gaps between the plurality of fins after assembly are reduced, and variations in heat dissipation performance can be reduced.

It is an exploded perspective view showing the whole heat sink concerning an embodiment of the invention. It is sectional drawing which shows the shape of the insertion hole formed in the baseplate, and the shape of the connection part formed in the fin, Comprising: (a) is provided with the arc-shaped protrusion avoidance groove | channel, (b) is substantially triangular. A protrusion-avoiding groove having a shape is provided. It is a 1st modification of this invention, Comprising: It is a disassembled perspective view which shows the whole heat sink. It is a 2nd modification of this invention, Comprising: It is a disassembled perspective view which shows the whole heat sink. It is a 3rd modification of this invention, Comprising: It is a disassembled perspective view which shows the whole heat sink. It is a disassembled perspective view which shows the heat sink of a prior art.

(First embodiment)
Hereinafter, the heat sink 1 according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.
The heat sink 1 includes a base plate 2 that comes into contact with the heating element, and a plurality of fins 3 for radiating heat transmitted from the base plate 2 to the outside air. Here, the heating element includes a heat transfer member in contact with the heating element in addition to the heating element itself.
The base plate 2 and the fins 3 are separate bodies, and the heat sink 1 is formed by assembling them after being manufactured separately. In the heat sink 1, a plurality of fins 3 are arranged in parallel at equal intervals on a base plate 2. The base plate 2 and the fins 3 are assembled so as to be substantially vertical.

As shown in FIG. 1, the base plate 2 is formed of a rectangular flat plate. The base plate 2 has a heat receiving surface 2a that comes into contact with the heating element, and a fin side surface 2b on the opposite side of the heat receiving surface 2a to which the fin 3 is attached.
The base plate 2 has a plurality of insertion holes 4 formed by pressing. The insertion hole 4 is punched by pressing a punch (not shown) of a mold from the heat receiving surface 2a side. The insertion hole 4 can be punched together when the outer shape of the base plate 2 is punched by press working, or may be punched in a separate process.
Furthermore, the plate thickness T1 of this base plate 2 (the same length as the length T2 of the insertion hole 4) is about 2 mm, but any thickness that can be punched out by press working is acceptable. May be.

As shown in FIG. 1, three insertion holes 4 are formed on the straight line along the longitudinal direction of one fin 3 at intervals. Further, the three insertion holes 4 are formed in parallel by the number of the plurality of fins 3.
The insertion hole 4 is formed so as to penetrate the plate thickness T1 of the base plate 2, and the length (depth) T2 of the insertion hole 4 and the plate thickness T1 of the base plate 2 coincide with each other.

As shown in FIG. 1, the fin 3 is formed of a rectangular flat plate. A connection portion 5 that protrudes downward toward the base plate 2 is formed on the lower side of the fin 3, that is, the side that is assembled toward the base plate 2 side.
Similarly to the base plate 2, the fins 3 are formed by stamping by press working. At this time, the shape of the connecting portion 5 is also formed simultaneously with the outer shape by pressing.

  The protruding length (insertion length) T3 of the connecting portion 5 is formed to a length that substantially matches the depth T2 of the insertion hole 4. As a result, in a state where the base plate 2 and the fins 3 are assembled, the front end surface 5a of the connecting portion 5 is substantially flush with the heat receiving surface 2a of the base plate 2 and is exposed from the heat receiving surface 2a.

  On the other hand, in the base plate 2 that has been subjected to press punching from the heat receiving surface 2a side by pressing, protrusions 7 may be generated at the peripheral edge of the insertion hole 4 as shown in FIG. Therefore, a recess 6 is formed at the base of the connection portion 5 of the fin 3 (the base portion of the connection portion 5) so as to avoid the protrusion 7 in a state where the fin 3 is assembled to the base plate 2. As shown in FIG. 2A, the concave portion 6 is formed by cutting out the corner portion of the base portion described above into a substantially arc shape. The occurrence of a gap due to the interference between the fins 7 and the fins 3 is avoided.

The shape of the recess 6 can be arbitrarily formed according to the shape of the protrusion 7. For example, the concave portion 8 shown in FIG. 2B is formed by notching a substantially triangular shape with the corner portion of the fin 3 facing upward. By forming the recess 8 into a groove that allows the protrusion 7 to enter the inside thereof, it is possible to avoid a gap due to the protrusion 7.
In addition, for example, the concave portion 8 can be formed by punching into a square shape, an oval shape, or the like according to the shape of a punch for press working.

  The base plate 2 and the fin 3 can be fixed by a conventionally known method such as soldering or caulking. In particular, in the case of caulking, the vicinity of the fin 3 on the fin side surface 2 b where the insertion hole 4 is formed can be fixed by caulking along the fin 3. Further, the fixing by caulking may be performed on one of the fins 3 or both.

  In the heat sink 1 according to the first embodiment of the present invention, the fin 3 formed by pressing and having at least one connection portion 5 formed on one side thereof is pressed at a position corresponding to the connection portion 5. A heat sink formed by assembling the base plate 2 and the fins 3 by inserting the connection portions 5 into the insertion holes 4. In the assembled state of the base plate 2 and the fin 3, the recess 6 for escaping the projection 7 generated by pressing at the peripheral portion of the insertion hole is provided. The protrusion 7 does not come into contact with the fin 3. Therefore, it is possible to prevent a gap due to the protrusion 7 from being generated between the base plate 2 and the fin 3 in the assembled state. As a result, heat transfer can be efficiently performed between the base plate 2 and the fins 3. Further, it is possible to prevent the fins 3 from being tilted and attached due to the protrusions 7, so that variations in the gaps between the plurality of fins 3 after assembly are reduced, and variations in heat dissipation performance can be reduced.

  The base plate 2 has a heat receiving surface 2a in contact with the heating element and a fin side surface 2b to which the fins are attached. The insertion hole 4 is formed by pressing from the heat receiving surface 2a side toward the fin side plane 2b side. Therefore, no protrusion is generated on the heat receiving surface 2a in contact with the heating element. Therefore, a gap due to the protrusion is not generated between the heating element and the base plate 2, and heat transfer between the heating element side and the base plate 2 can be performed efficiently.

  Further, since the insertion length T3 of the connection portion 5 is formed to be substantially equal to the depth T2 of the insertion hole 4, the front end surface 5a of the connection portion 5 of the fin 3 is exposed to the heat receiving surface 2a side of the base plate 2. Thereby, the fin 3 and a heat generating body can be made to contact directly. Thereby, the heat of a heat generating body can be directly transferred to the fin 3, and the bigger heat dissipation effect can be acquired.

(Second Embodiment)
Hereinafter, the heat sink 10 according to the second embodiment of the present invention will be described in detail with reference to FIG.
In addition, since the form of the heat sink 10 is substantially the same as the heat sink 1 shown in 1st Embodiment, only a different part is demonstrated in the following description.

  As shown in FIG. 3, the fin 30 of the heat sink 10 has a claw portion 9 that is in contact with the fin side surface 2 b of the base plate 2 at a side portion of the connection portion 5 (a portion where the connection portion 5 is not formed). . The claw portion 9 is located between the adjacent connection portions 5 or on the side portions of the connection portion 5 on both sides of the fin 30, and the fin 3 in the first embodiment leaves a portion cut off by press work, It is formed by being bent at right angles to the main surface 30 and parallel to the fin side surface 2b. The claw portion 9 is bent at an angle substantially parallel to the fin side surface 2b of the base plate 2, and the lower flat surface 9a of the claw portion 9 is attached to the fin side of the base plate 2 in a state where the base plate 2 and the fin 30 are assembled. It is formed so as to be in thermal contact with the plane 2b.

  Moreover, in the fin 30, the recessed part which is not shown in figure is provided in the base part (part by which the nail | claw part 9 is bent) of the connection part 5 similarly to the heat sink 1 which concerns on 1st Embodiment of this invention. As a result, similarly to the heat sink 1 according to the first embodiment, it is possible to prevent a gap due to the protrusion from being generated between the base plate 2 and the fin 30. Furthermore, in the second embodiment of the present invention, since the stress applied to the fin 30 when the claw portion 9 is bent can be relaxed, the fin 30 is deformed, and the connection portion 5 and the insertion hole 4 are deformed. It is possible to prevent the position from shifting and making it difficult to insert, and preventing the fin side surface 2b and the claw portion 9 from coming into contact with each other.

  As in the first embodiment, the insertion hole 4 is punched by pressing a die punch (not shown) from the heat receiving surface 2a side toward the fin side plane 2b side. The insertion hole 4 can be punched together when the outer shape of the base plate 2 is punched by press working, or may be punched in a separate process.

  In the state where the base plate 2 and the fins 30 are assembled, the front end surface 5a of the connecting portion 5 is flush with the heat receiving surface 2a of the base plate 2 and is exposed from the heat receiving surface 2a.

  According to the heat sink 10 according to the second embodiment of the present invention, the fin 30 in which the connecting portion 5 formed by pressing is formed, and the insertion hole formed by pressing at a position corresponding to the connecting portion 5. The fin 30 has a recess 6 formed at the base of the connection portion 5 and a fin side surface 2b. Since the claw portion 9 that is in contact with the lower plane 9 a is provided, the protrusion 7 enters the recess 6 in the assembled state, and the protrusion 7 does not contact the fin 3. Therefore, it is possible to prevent a gap due to the protrusion 7 from being generated between the base plate 2 and the fin 3 in the assembled state. As a result, heat transfer can be efficiently performed between the base plate 2 and the fins 3.

  In addition, the claw portion 9 regulates the inclination of the fin 30 and can prevent the fin 30 from being inclined and assembled (the fin 30 falling). Thereby, the dispersion | variation in the clearance gap between several fins 3 decreases, and the dispersion | variation in heat dissipation performance can be reduced.

  Furthermore, when the fin side plane 2b and the lower side plane 9a are in contact with each other, the contact area between the base plate 2 and the fin 30 is increased, and heat transfer can be performed efficiently.

  Furthermore, the base plate 2 has a heat receiving surface 2a in contact with the heating element and a fin side surface 2b to which the fin is attached. The insertion hole 4 is formed by pressing from the heat receiving surface 2a side to the fin side flat surface 2b side. Therefore, no protrusion is generated on the heat receiving surface 2a in contact with the heating element. Therefore, a gap due to the protrusion is not generated between the heating element and the base plate 2, and heat transfer between the heating element side and the base plate 2 can be performed efficiently.

(Third embodiment)
Hereinafter, a heat sink 100 according to a third embodiment of the present invention will be described in detail with reference to FIG.
In addition, since the form of the heat sink 100 is substantially the same as the heat sink 1 shown in 1st Embodiment, only a different part is demonstrated in the following description.

  The base plate 200 of the heat sink 100 is formed with an insertion hole 400 in which the insertion hole 4 of the first embodiment has a key shape. Further, as shown in FIG. 4, the fin 300 is formed with a bent portion 510 in which one side portion of the connecting portion 500 is folded at right angles to the main surface of the fin 300 and along the insertion direction of the connecting portion 500. Has been. The connecting portion 500 and the bent portion 510 are formed in a key shape when viewed from the lower side of the fin 300, and correspond to the key shape of the insertion hole 400 and can be inserted into the insertion hole 400. Yes.

  The insertion hole 400 is punched by pressurizing a die punch (not shown) from the heat receiving surface 200a side toward the fin side surface 200b side. The insertion hole 400 can be punched together when the outer shape of the base plate 200 is punched by pressing, or may be punched in a separate process.

  In the state where the base plate 200 and the fins 300 are assembled, the front end surface 500a of the connecting portion 500 is flush with the heat receiving surface 200a of the base plate 200 and is exposed from the heat receiving surface 200a.

  In the heat sink 100 according to the third embodiment of the present invention, the heat sink 100 is formed by pressing at a position corresponding to the fin 300 having at least one connecting portion 500 formed by pressing and the connecting portion 500. A base plate 200 having an insertion hole 400, and a heat sink configured by assembling the base plate 200 and the fin 300 by inserting the connection portion 500 into the insertion hole, and the fin 300 is a base portion of the connection portion 500. The connecting portion 500 of the fin 300 is provided with a bent portion 510 that is bent by pressing and inserted into the insertion hole 400 having a corresponding shape, that is, a L-shaped cross section. Therefore, in the assembled state, the protrusion 7 enters the recess 6 and the protrusion 7 comes into contact with the fin 300. There is no. Therefore, it is possible to prevent a gap due to the protrusion 7 from being generated between the base plate 200 and the fin 300 in the assembled state. As a result, heat transfer can be efficiently performed between the base plate 200 and the fins 300.

  Further, the bent portion 510 regulates the inclination of the fin 300, and the fin 300 can be prevented from being inclined and assembled (falling of the fin 300). Thereby, the dispersion | variation in the clearance gap between the several fin 300 decreases, and the dispersion | variation in heat dissipation performance can be reduced.

  Furthermore, by bending the connection portion 500 to form the bent portion 510, the interval between the adjacent insertion holes 400 (adjacent connection portions 500) can be increased, and the surface of the fin 300 of the base plate 200 can be increased. The thermal diffusion effect in the vertical direction can be increased.

  Furthermore, the base plate 200 has a heat receiving surface 200a in contact with the heating element, and a fin side surface 200b to which the fin is attached, and the insertion hole 400 is formed by pressing from the heat receiving surface 200a side to the fin side flat surface 200b side. Therefore, no protrusion is generated on the heat receiving surface 200a in contact with the heating element. Therefore, a gap due to the protrusion is not generated between the heating element and the base plate 200, and heat transfer between the heating element and the base plate 200 can be performed efficiently.

  Furthermore, according to this configuration, when the fin 300 is fixed to the base plate 200, the inner side of the insertion hole 400 formed in the L-shape (the portion sandwiched between the two sides of the insertion hole 400) is easily plastically deformed, which is small. It can be fixed by force. Thereby, even if the base plate 200 is thinned to about 2 to 5 mm for reducing the weight of the heat sink, the deformation of the base plate 200 is suppressed.

  In the third embodiment, only one side portion of the connecting portion 500 is folded back to form the bent portion 510. However, both side portions may be folded back to form a U-shaped bent portion. For example, as shown in FIG. 5, the left and right side portions of the connection portion 500 of the heat sink 301 are folded at right angles to the main surface of the fin 300 and along the insertion direction of the connection portion 500, so that two bent portions 511 are formed. Form. The connecting portion 500 and the two bent portions 511 are formed in a substantially U-shape when viewed from the lower side of the fin 300. Similarly, an insertion hole 401 having a shape corresponding to the U-shape is formed in the base plate 201.

  The insertion hole 401 is punched by pressing a die punch (not shown) from the heat receiving surface 201a side toward the fin side flat surface 201b side. The insertion hole 401 can be punched together when the outer shape of the base plate 201 is punched by pressing, or may be punched in a separate process.

  Also with this configuration, the two bent portions 510 can regulate the inclination of the fin 301 and prevent the fin 301 from being inclined and assembled (the fin 301 falling). Further, by forming the bent portion 510 by bending the connecting portion 500, the interval between the adjacent insertion holes 400 (adjacent connecting portions 500) can be widened, and the thermal diffusion effect of the base plate 201 is increased. Can do.

  Furthermore, according to this configuration, when the fin 301 is fixed to the base plate 201, the inside of the insertion hole 401 formed in a U-shape (portion surrounded by the U-shape) is easily plastically deformed. It is possible to fix it by caulking with a small force.

1, 10, 100, 101 Heat sink 2, 200, 201 Base plate 2a, 200a, 201a Heat receiving surface 2b, 200b, 201b Fin side surface 3, 30, 300, 301 Fin 4, 400, 401 Insert hole 5,500 Connection portion 5a, 50a, 500a Front end surface 6,8 Recessed portion 7 Protrusion 9 Claw portion 9a Lower flat surface 510 Bending portion T1 Base plate thickness T2 Length of insertion hole (depth)
T3 connection length

Claims (4)

A fin having at least one connecting portion on one side of the outer periphery of the plate-like body;
A base plate having an insertion hole formed by pressing at a position corresponding to the connection portion;
A heat sink configured by inserting the connecting portion into the insertion hole;
The heat sink according to claim 1, wherein the fin is provided with a recess for escaping a protrusion generated at an edge of the insertion hole at a base portion of the connection portion.   2. The heat sink according to claim 1, wherein the fin includes a claw portion that is in contact with a plane of the base plate at a portion where the connection portion of the one side is not formed.   The heat sink according to claim 1, wherein the connection portion includes a bent portion that is bent at a right angle to the plate-like body and along a direction in which the connecting portion is inserted into the insertion hole.   The base plate has a heat receiving surface in contact with the heating element side and a fin side plane to which the fin is attached, and the insertion hole is formed by pressing from the heat receiving surface side toward the fin side plane. The heat sink according to any one of claims 1 to 3, characterized in that:

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