JP2016035979A - heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink that has a large surface area and can be manufactured at low cost.SOLUTION: A heat sink has a first heat sink member 2 having many radiation fins 5 which are formed on a first base plate 4 so as to be erected from the first base plate 4 and spaced from one another at predetermined intervals, and a second heat sink member 3 having many fin receiving portions 7 which can receive parts 5a of the fins 5 and are formed on a second base plate 6 so as to be erected from the second base plate 6 and spaced from one another at predetermined intervals. The parts 5a of the fins 5 protrude into the fin receiving portions 7, and the first heat sin member 2 and the second heat sin member 3 are joined to each other without being fastened between the fins 5 and the fin receiving portions 7 under the state that the parts 5a of the fins 5 are in contact with the fin receiving portions 7.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat sink for dissipating heat generated from electronic or electrical components.

In order to dissipate electronic or electrical components (hereinafter referred to as “heat generating components”), a heat sink is used as described in Patent Documents 1 and 2, for example. As a material for the heat sink, aluminum, zinc, or the like is generally used as an inexpensive material that easily transmits heat. In addition, a heat sink component manufacturing method includes a die-casting method and an extrusion molding method, and a caulking bonding method is a method for bonding fins to a base plate.

As a configuration suitable for caulking the fin to the base plate, Patent Document 3 includes
It is described that “a structure in which the projecting wall portions 3 and 3 for radiating fin mounting guides and radiating fins are erected with a V-shaped opening of about 40 °” are provided on the base plate (No. 3 of Patent Document 3). 2
(Left column, lines 29-31, FIGS. 1 and 2).

By the way, in order to improve the heat dissipation of the heat sink, it is effective to increase the surface area of the heat sink. In order to increase the surface area, it is conceivable to increase the number of fins of the heat sink or increase the size of the heat sink.

JP-A-10-163388 JP-A-6-21282 Japanese Patent Publication No. 1-21822

However, when increasing the number of fins of the heat sink or increasing the size of the heat sink, there are the following problems if the conventional manufacturing method is applied as it is. That is, according to the die-casting method, the production cost of the mold is increased, so that the product unit price is increased. According to the extrusion molding method, only a product within the range of the extrusion pressure capacity of the extrusion press machine can be manufactured, and thus there is a limit to increasing the size of the heat sink. Further, according to the caulking / bonding method, in addition to the manufacturing cost of the caulking jig, an additional caulking process cost for caulking / bonding a large number of fins to the base plate is increased, resulting in an increase in manufacturing cost.

The present invention has been made in view of the above circumstances, and aims to provide a heat sink that has a large surface area and can be manufactured at low cost.

In order to solve the above problems, a heat sink according to the present invention includes a first heat sink member in which a plurality of fins for heat dissipation are erected on a first base plate with a predetermined interval therebetween,
And a second heat sink member in which a plurality of fin receiving portions capable of receiving a part of the fin are erected on the second base plate at a predetermined interval from each other, and the part of the fin And the first heat sink member and the fin receiving portion without being fixed to each other in a state where the fin and the fin receiving portion are in contact with each other. The second heat sink member is coupled to each other (claim 1).

According to the present invention, the first heat sink member and the second sheet sink member are formed separately, and a single heat sink is formed by connecting them together. Since the first heat sink member and the second heat sink member are separately manufactured, even if each heat sink member is small or has a small surface area, the surface area of the heat sink as a whole is increased and the heat dissipation is improved. . Since each heat sink member can be formed in a small size or a small surface area, the manufacturing cost can be suppressed. Further, by causing a part of the fin to enter the fin receiving part, the fin and the fin receiving part are not fixed in a state where the part of the fin and the fin receiving part are in contact with each other. Since the first heat sink member and the second heat sink member are coupled to each other, it is not necessary to crimp the fin and the fin receiving portion in a fitted state. Therefore, the disadvantages of the conventional caulking coupling method described above can be solved.

As one preferred embodiment, the part of the fin has a tapered shape that gradually becomes thinner as it approaches the tip, and the opening end side of the inner surface of the fin receiving portion gradually approaches the opening end. A pair of inclined surfaces that are wide, and the fin and the fin so that the fin can enter the fin receiver even when the center axis of the fin and the center axis of the fin receiver are misaligned. An example in which at least one of the fin receiving portions can be deformed is illustrated (Claim 2).

According to this embodiment, even if there is a dimensional tolerance of the arrangement interval of the fins on the first base plate or a dimensional tolerance of the arrangement interval of the fin receiving portions on the second base plate. The fin can enter the fin receiving portion. That is, the fin has a tapered shape, and gradually widens as the fin receiving portion approaches the opening end,
And, since at least one of the fin and the fin receiving portion can be deformed,
Even when there is a deviation between the position of the fin and the position of the fin receiving portion due to the dimensional tolerance, the fin is likely to enter the fin receiving portion by being guided by the inclined surface of the fin receiving portion. Moreover, the degree of mutual contact between the fin and the fin receiving portion is reliable and suitable for heat conduction, which is preferable.

As a preferred embodiment, a mode in which the fin receiving portion is deformable will be exemplified (claim 3). In this way, the following effects can be obtained. For example, when at least one of the first heat sink member and the second heat sink member is formed by an extrusion molding method, the thickness of the fin with respect to the opening width of the fin receiving portion is reduced due to wear of the extrusion mold. May be relatively large. However, if the above configuration is adopted, the fin can be pushed into the fin receiving portion so as to spread the fin receiving portion, so that there is no problem of incompatibility between the fin and the fin receiving portion. Further, damage to the fins and the fin receiving portion can be prevented.

As a preferred embodiment, the fin receiving portion is composed of a pair of rising pieces formed on the second base plate, and the substantially lower half faces of the pair of rising pieces facing each other are the second base. An example is shown in which the upper half surfaces of the pair of rising pieces are surfaces perpendicular to the plate, and the pair of inclined surfaces are the pair of inclined surfaces (Claim 4).

1 is an overall perspective view of a heat sink according to an embodiment of the present invention. It is an enlarged front view of the heat sink of FIG. FIG. 3 is an exploded view of the heat sink of FIG. 2. It is an enlarged view of the A section of FIG. (A) is explanatory drawing when a fin receiving part can deform | transform, (b) is explanatory drawing when a fin can deform | transform.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a heat sink 1 according to an embodiment of the present invention includes a first heat sink member 2 and a second heat sink member 3. These two heat sink members 2, 3
Are formed separately in advance by a die-casting method or an extrusion molding method and then combined with each other to form the heat sink 1. As the material of each heat sink member 2, 3, aluminum, zinc, or the like is used as an inexpensive material that easily transmits heat.

The first heat sink member 2 includes a first base plate 4 and a large number of fins 5 for heat dissipation. The fins 5 are erected on the first base plate 4 (the lower surface of the base plate 4 in FIG. 1) with a predetermined interval between them. The fins 5 may be integrally formed with the first base plate 4 in advance by a die-casting method or an extrusion forming method (integral forming method), and the first base plate 4
And the fin 5 may be formed separately using an extrusion molding method or a punching method, respectively, and the fin 5 may be retrofitted to the first base plate 4 using a caulking bonding method, a brazing method, or the like. ). According to the integral molding method, the process of retrofitting the fins 5 to the first base plate 4 is not necessary, so that the cost for the retrofitting process can be saved. According to the retrofitting method, the first base plate 4 and the fins 5 are formed separately, so that a larger size can be formed than when they are integrally formed. For this reason, a heat sink with good heat dissipation can be obtained.

The second heat sink member 3 includes a second base plate 6 and a fin receiving portion 7 that can receive a part of the fin 5. The fin receiving portion 7 is erected on the second base plate 6 with a predetermined interval therebetween. The fin receiving portion 7 may be formed integrally with the second base plate 6 in advance, or may be retrofitted to the second base plate 6 using a caulking method or a brazing method, It is preferable that the fin receiving portion 7 is integrally formed in advance on the second base plate 6 by die casting or extrusion molding.

In the illustrated example, the wall plates 8 and 8 are integrally formed upright on both sides of the second base plate 6 in advance.
The upper end surfaces of the wall plates 8 and 8 and the lower surface of the first base plate 4 are brought into close contact with each other and are connected to each other by appropriate fixing means such as screws 9. Thereby, the 1st heat sink member 2 and the 2nd heat sink member 3 are mutually connected, and heat conduction between them becomes possible. Wall plate 8
, 8 may be integrated with the first base plate 4 in advance instead of the second base plate 6.

As shown in FIG. 2, the lower end portion 5 a that is a part of the fin 5 enters the fin receiving portion 7 in a coupled state of the first heat sink member 2 and the second heat sink member 3. The fins 5 and the fin receiving portions 7 are arranged at positions corresponding to each other so that the fins 5 protrude into the fin receiving portions 7 when the first base plate 4 and the second base plate 6 are combined. Established. Each fin 5
In the state where the fins have entered the fin receiving portions 7, the lower end portions 5a of the fins 5 and the fin receiving portions 7 come into contact with each other. Thereby, heat conduction becomes possible between each fin 5 and each fin receiving part 7. The fins 5 and the fin receiving portions 7 are in contact with each other only in a thermally conductive state and do not need to be fixed to each other.

As shown in FIG. 2, the heat sink 1 dissipates heat generated from the electronic or electrical component 10 by arranging the first base plate 4 or the second base plate 6 in contact with the electronic or electrical component 10. Let

In the present embodiment, the first heat sink member 2 and the second sheet sink member 3 are formed separately, and the base plates 4 and 6 are joined together to form a single heat sink 1.
Is formed. Since the first heat sink member 2 and the second heat sink member 3 are separately manufactured, even if the heat sink members 2 and 3 are small or have a small surface area, the surface area of the heat sink 1 as a whole is increased and the heat dissipation performance is increased. Becomes better. Each heat sink member 2,
Since 3 can be formed as a small size or a small surface area, the manufacturing cost can be suppressed, and even when extrusion molding is performed, molding with a relatively small extrusion pressure is possible. Further, since the fin 5 and the fin receiving portion 7 are not fixed and the first heat sink member 2 and the second heat sink member 3 are coupled to each other, the fin 5 and the fin receiving portion 7 are joined by caulking. The conventional cost problem that has occurred can also be solved.

In the present embodiment, as shown in FIGS. 3 to 5, the heat sink 1 has the following characteristics.

First, the part (lower end part 5a) which enters into each fin receiving part 7 of each fin 5 is made into the taper shape which becomes thin gradually as it approaches a front-end | tip. In the example of the attached drawings,
Although the tapered shape of the fin 5 is exaggerated, the tip of the fin 5 may be rounded. Further, as clearly shown in FIG. 4, the inner surface of the fin receiving portion 7 is formed as a pair of inclined surfaces 12 and 12 that gradually become wider as the opening end 11 is approached. And as shown in FIG.
At least one of the fin 5 and the fin receiving portion 7 so that the fin 5 can enter the fin receiving portion 7 even when the central axis X1 of the fin 5 and the central axis X2 of the fin receiving portion 7 are shifted. One is formed with a deformable thickness.

As shown in FIG. 4, each fin receiving portion 7 is composed of a pair of rising pieces 7 a, 7 a formed on the second base plate 6, and the substantially lower half surface of the pair of rising pieces 7 a, 7 a facing each other. 13 and 13 extend at right angles to the second base plate 6 and parallel to each other. Further, the upper half surfaces of the pair of rising pieces 7a, 7a are the pair of inclined surfaces 12, 12. The pair of inclined surfaces 12 and 12 are gradually widened toward the upper opening ends 11 and 11 as viewed in FIG.

According to the above configuration, even if there is a dimensional tolerance of the arrangement pitch of the fins 5 in the first base plate 4 and a dimensional tolerance of the arrangement pitch of the fin receiving portions 7 in the second base plate 6, 7 can be inserted into the fin 5. That is, the fin 5 has a tapered shape, and the width of the upper portion of the fin receiving portion 7 gradually increases as it approaches the open ends 11, 11, and
Since at least one of the fin 5 and the fin receiving portion 7 can be deformed, as shown in FIG. 5, even when the position of the corresponding fin 5 and the fin receiving portion 7 has a deviation due to the dimensional tolerance, the fin receiving The fin 5 is likely to enter the fin receiving portion 7 by being guided by the inclined surfaces 12, 12 of the portion 7. Further, there is an advantage that the degree of mutual contact between the fin 5 and the fin receiving portion 7 is surely suitable for heat conduction.

FIG. 5 shows a state in which the fin 5 enters and contacts the fin receiving portion 7. FIG.
(A) is a case where the fin receiving part 7 is deformable, and one rising piece 7 a is inclined from the root part by the entry of the fin 5 to receive the fin 5. FIG. 5 (b) shows a case where the fin 5 can be deformed, and the fin 5 is tilted from the root portion and is received in the fin receiving portion 7 by entering the fin receiving portion 7.

As shown in FIG. 5A, the thickness of the pair of rising pieces 7a, 7a constituting the fin receiving portion 7 is made smaller than the thickness of the fin 5, and the fin receiving portion 7 is deformed when the fin 5 enters. If configured to do so, the following other effects can also be obtained. For example, the first heat sink member 2
When at least one of the second heat sink member 3 is formed by an extrusion molding method, the thickness of the fin 5 is larger than the opening width of the fin receiving portion 7 due to wear of the extrusion die based on continuous use over a long period of time. May be relatively large. However, if the thickness of the pair of rising pieces 7a, 7a constituting the fin receiving portion 7 is smaller than the thickness of the fin 5, the fin receiving portion 7 is deformed by the entry of the fin 5, so that the fin 5 7 can be pushed into the fin receiving portion 7 so as to spread. For this reason, the problem of incompatibility does not arise between the fin 5 and the fin receiving part 7, and damage to the fin 5 and the fin receiving part 7 can also be prevented.

Note that, as described above, as a method of imparting deformability to the fin 5 or the fin receiving portion 7, there is a difference in the thickness between the fin 5 and the fin receiving portion 7. It is good also as providing a deformability by providing a thin part in the base of 7.

DESCRIPTION OF SYMBOLS 1 Heat sink 2 1st heat sink member 3 2nd heat sink member 4 1st base board 5 Fin 5a A part of fin (lower end part)
6 Second base plate 7 Fin receiving portion 7a, 7a A pair of rising pieces 11, 11 Open ends of fin receiving portion 12, 12 A pair of inclined surfaces X1 Central axis of fin X2 Central axis of fin receiving portion

JP-A-10-163388 JP-A-6-21282 Japanese Patent Publication No. 1-15711

In order to solve the above-described problems, a heat sink according to the present invention includes a first heat sink member in which a plurality of heat-dissipating fins are erected on a first base plate with a predetermined interval therebetween, and the fin And a second heat sink member in which a plurality of fin receiving portions capable of receiving a part are formed upright on the second base plate with a predetermined interval therebetween, and the part of the fin is the fin The first heat sink member and the second heat sink member are inserted into the receiving portion, and the fin and the fin receiving portion are not fixed in a state where the part of the fin and the fin receiving portion are in contact with each other. coupled with the heat sink member together, wherein the portion of the fin is the previous thin shape gradually becomes thinner toward the tip end, the open end side of the inner surface of the fin receiving portion, the closer to the opening end A pair of inclined surfaces that are gradually widened so that the fin can enter the fin receiving portion even when the central axis of the fin and the central axis of the fin receiving portion are deviated. , at least one of the fins and the fin receiving portion and said deformable der Rukoto (claim 1).

Further, according to the present invention, even if there is a dimensional tolerance of the arrangement interval of the fins on the first base plate or a dimensional tolerance of the arrangement interval of the fin receiving portions on the second base plate. The fin can enter the fin receiving portion. That is, the fin is tapered, the width gradually increases as the fin receiving portion approaches the opening end, and at least one of the fin and the fin receiving portion is deformable, Even when there is a deviation between the position of the fin and the position of the fin receiving portion due to the dimensional tolerance, the fin is likely to enter the fin receiving portion by being guided by the inclined surface of the fin receiving portion. Moreover, the degree of mutual contact between the fin and the fin receiving portion is reliable and suitable for heat conduction, which is preferable.

As a preferred embodiment, a first heat sink member in which a large number of heat-dissipating fins are erected on the first base plate with a predetermined space between each other, and the tip of the fin can be received. A plurality of second heat sink members standing upright on the second base plate with a predetermined interval between each other, and the tip portion of the fin enters the fin receiving portion, The first heat sink member and the second heat sink member are coupled to each other without the fin and the fin receiving portion being fixed to each other with the tip portion of the fin and the fin receiving portion being in contact with each other. The tip end portion of the fin is rounded, and the opening end side of the inner surface of the fin receiving portion is a pair of inclined surfaces gradually becoming wider as approaching the opening end, and the center of the fin At least one of the fin and the fin receiving portion can be deformed so that the fin can enter the fin receiving portion even when the line and the central axis of the fin receiving portion are misaligned. It can also be a heat sink (claim 2). Also in this case, the same effects as described above can be obtained.

Claims (4)

A first heat sink member in which a plurality of heat dissipating fins are erected on the first base plate with a predetermined interval therebetween, and a fin receiving portion capable of receiving a part of the fin are predetermined between each other. A plurality of second heat sink members formed upright on the second base plate with an interval of, wherein the part of the fin enters the fin receiving part, and the part of the fin and the part of the fin A heat sink in which the first heat sink member and the second heat sink member are coupled to each other without the fin and the fin receiving portion being fixed to each other in a state where the fin receiving portion is in contact with each other. A pair of inclined surfaces in which the part of the fin has a tapered shape that gradually decreases in thickness as it approaches the tip, and the opening end side of the inner surface of the fin receiving portion gradually increases in width as it approaches the opening end. And at least one of the fin and the fin receiving portion so that the fin can enter the fin receiving portion even when the central axis of the fin and the central axis of the fin receiving portion are misaligned. The heat sink of claim 1, wherein one is deformable.   The heat sink according to claim 2, wherein the fin receiving portion is deformable. The fin receiving portion is composed of a pair of rising pieces formed on the second base plate, and the opposed lower half surfaces of the pair of rising pieces are surfaces perpendicular to the second base plate. 4. The heat sink according to claim 2, wherein substantially upper half surfaces of the pair of rising pieces are the pair of inclined surfaces.

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