JP6785706B2 - heatsink - Google Patents

Description

It relates to a heat sink used for cooling a semiconductor element or the like.

Conventionally, an air-cooled heat sink has been used to cool semiconductors mounted on electronic devices. As an air-cooled heat sink, a heat sink in which a plurality of aluminum alloy heat sink members formed by extrusion are combined to form a duct shape (cylindrical shape) is known (Patent Document 1).

Japanese Unexamined Patent Publication No. 9-293809

In order to form the heat sink of Patent Document 1, the fin portion provided on the base plate on one side is fitted into the groove (fin fitting groove) provided on the base plate on the other side, and fixed by caulking or the like. It had to be done, and means and processes for caulking and the like were required, and the production was complicated.
In addition, the fin portion arranged in the groove may not sufficiently contact the inner side wall of the groove, and heat transfer between the fin portion and the groove may not be sufficiently achieved.

The present invention has been made in view of the above circumstances, and is provided on one of the base portions when a plurality of heat sink members including a base plate portion and a fin portion are joined to face each other in an air-cooled heat sink. Provided is a heat sink which facilitates the joining between the fin portion and the groove formed on the other side and is easy to manufacture, and which can sufficiently contact the fin portion and the groove to reliably transfer heat. With the goal.

The present invention is a heat sink formed by combining a plurality of heat sink members, and one heat sink member has at least a base portion and a plurality of plate-shaped fin portions provided on one surface of the base portion. The other heat sink member is provided with at least a base portion and a plurality of fin fitting grooves provided on one surface of the base portion, and one heat sink member and the other heat sink member are one of the respective base portions. One surface faces each other, and the tip of the fin portion provided on one heat sink member is fitted and combined with the fin fitting groove provided on the other heat sink member, and one fin portion is fitted into the fin fitting groove. In this state, it is pressed against one of the side walls of the fin fitting groove, and the other fin portion adjacent to one fin portion is fitted into the fin fitting groove, and one fin portion of the fin fitting groove is pressed against it. It is characterized in that it is pressed against the side wall opposite to the side wall .

According to the heat sink of the present invention, when a plurality of heat sink members composed of a base plate portion and a fin portion are joined to face each other, the fin portion provided on the base portion on one side and the groove formed on the other side can be easily formed. It can be joined and the manufacture of the heat sink can be simplified.

It is a perspective view of the heat sink which concerns on embodiment of this invention. (A) is a front view of a heat sink member constituting the heat sink according to the first embodiment of the present invention, and (b) is a front view of a heat sink formed by connecting the heat sink members. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 1st Embodiment of this invention, (a) is the whole sectional view at the time of starting connection, (b) is the same part enlarged. It is a sectional view. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 1st Embodiment of this invention, (a) is the whole sectional view at the time of completion of connection, (b) is the same part enlarged sectional view. It is a figure. (A) is a front view of a heat sink member constituting the heat sink according to the second embodiment of the present invention, and (b) and (c) are partially enlarged front views of the heat sink member. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 2nd Embodiment of this invention, (a) is the whole sectional view at the time of starting connection, (b) is the same part enlarged. It is a sectional view. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 2nd Embodiment of this invention, (a) is the whole sectional view at the time of completion of connection, (b) is the same part enlarged sectional view. It is a figure. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 3rd Embodiment of this invention, (a) is the whole sectional view at the time of starting connection, (b) is the same part enlarged. It is a sectional view. It is a figure for demonstrating the procedure of connecting the heat sink members of the heat sink which concerns on 3rd Embodiment of this invention, (a) is the whole sectional view at the time of completion of connection, (b) is the same part enlarged sectional view. It is a figure. Both (a) and (b) are sectional views of a heat sink according to another embodiment of the present invention.

The heat sink according to the present invention will be described with reference to the drawings.
(Overall composition)
As shown in FIG. 1, the heat sink according to the present invention is formed by extrusion molding of an aluminum alloy or the like having high thermal conductivity, and heat sink members 1 and 1 having a plurality of fin portions 13 for heat dissipation are connected to face each other. It has a duct shape (cylindrical shape) having a substantially rectangular cross section in which cooling air flows in the longitudinal direction of the heat sink.
In this description, the direction in which air flows through the duct-shaped (cylindrical) heat sink is referred to as the longitudinal direction, the direction in which the fin portions 13 rise is referred to as the vertical direction, and the direction in which the plurality of fin portions are lined up is referred to as the width direction.

(First Embodiment)
The heat sink according to the first embodiment of the present invention can be manufactured by connecting a pair of heat sink members 1 and 1 having the same structure so as to face each other.
As shown in FIG. 2A, each heat sink member 1 has a base portion 11 made of a plate-shaped member having a substantially rectangular shape in a plan view, and a side plate portion erected on one side end portion in the width direction of one surface of the base portion 11. It has a fin portion 12 and a plurality of fin portions 13 erected side by side on one surface of the base portion 11.
When the heat sink is manufactured by connecting the pair of heat sink members 1 and 1, the surface on which the side plate portion 12 and the fin portion 13 of the base portion 11 are erected (hereinafter referred to as "inner peripheral surface 11b"). ) And the surface opposite to) is configured to be a cooling surface 11a on which the heating element is arranged.

A plurality of fin portions 13 provided on the inner peripheral surface 11b of the base portion 11 are erected side by side in the width direction. Then, between the side plate portion 12 and the fin portion 13 of the inner peripheral surface 11b of the base portion 11 and between the fin portions 13 and 13 adjacent to each other, the fin fitting groove into which the tip of the fin portion 13 of the facing heat sink member 1 is fitted. 111 is provided along the longitudinal direction.
Further, a side plate fitting groove 112 into which the tip of the side plate portion 12 of the facing heat sink member 1 is fitted is provided at the other end of the inner peripheral surface 11b of the base portion 11 in the width direction.
Then, each fin fitting groove 111 is located at a position facing the portion where the fin portion 13 of the facing heat sink member 1 is formed (the position of the root of the fin portion 13) with the heat sink members 1 and 1 facing each other. It is formed.

The side plate portion 12 is provided so that the outer peripheral surface is flush with one side surface of the base portion 11 from one side end in the width direction of the base portion 11, and the inner peripheral surface thereof extends in the width direction of the heat sink member 1. A plurality of plate-shaped side plate fin portions (sub fin portions) 122 are provided in the vertical direction. The tip of the side plate portion 12 is slightly bent and extends in the inner peripheral direction from the outer peripheral surface, and is formed as a fitting end portion 12a that fits into the side plate fitting groove 112 of the base portion 11 of the facing heat sink member 1. There is.

The fin portion 13 is composed of a plate-shaped main fin portion 131 that stands upright from the inner peripheral surface 11b of the base portion 11, and a plate-shaped sub fin portion 132 that extends in the width direction from both side surfaces of the main fin portion 131. , A plurality of sub fin portions 132 are provided in the vertical direction. The tip of the main fin portion 131 is formed as a fitting end portion 13a that fits into the fin fitting groove 111 of the base portion 11 of the facing heat sink member 1.

In the heat sink member 1 of the heat sink according to the first embodiment, each fin portion 13 is inclined and erected with respect to the base portion 11, and the adjacent fin portions 13, 13 are inclined in different directions. It is provided.
Specifically, of the three fin portions 13, the fin portion (first fin portion) 13A adjacent to the side plate portion 12 has an inclination angle α1 smaller than 1 ° or less from the plane perpendicular to the inner peripheral surface 11b of the base portion 11. The fin portion (second fin portion) 13B which is erected with (= 89 to 90 °) and is adjacent to the side plate fitting groove 112 side of the first fin portion 13A is inside the base portion 11. The fin portion is erected with an inclination angle α2 (= 90 to 91 °) larger than 1 ° or less from the plane perpendicular to the peripheral surface 11b, and is adjacent to the side plate fitting groove 112 side of the second fin portion 13B. The (third fin portion) 13C is erected with an inclination angle α3 (= 89 to 90 °) smaller than 1 ° or less from the plane perpendicular to the inner peripheral surface 11b of the base portion 11.
The side plate portion 12 is erected at a substantially right angle (90 ° ± 0.5 °) with respect to the inner peripheral surface 11b of the base portion 11.

Then, as shown in FIG. 2B, the heat sink formed by connecting the heat sink members 1 and 1 facing each other has the fin portions 13 fitted into the fin fitting grooves 111 with respect to the base portion 11. Since the fin portion 13 is in a state of a right angle, a restoring force acts on the fin portion 13 in a direction (arrow x1) inclined with respect to the base portion 11, and the side surface of the tip of each fin portion 13 is one of the fin fitting grooves 111. It is pressed against the side wall.
At this time, the restoring force acting on the adjacent fin portions 13 and 13 acts in different directions, and the adjacent fin portions 13 have different side walls of the fin fitting groove 111 to be pressed, so that the processing such as caulking is not performed. Even so, the side surface of the tip of the fin portion 13 is in close contact with the side wall of the fin fitting groove 111 of the base portion 11, and heat can be reliably transferred.

(Connecting process of heat sink member)
A process of connecting the heat sink members 1 and 1 to manufacture a heat sink will be specifically described.
In order to manufacture a heat sink, when the other heat sink member 1B is brought close to the one heat sink member 1A so as to face each other, as shown in FIG. 3A, the first fin of one heat sink member 1A The fitting end portion 13a of the portions 13A to the third fin portion 13C approaches the fin fitting groove 111 provided in the base portion 11 of the other heat sink member 1B in a state of being displaced in the width direction.
The same applies to the fin portion 13 of the other heat sink member 1B and the fin fitting groove 111 of the one heat sink member 1A, but the description thereof will be omitted here.

Of the fin fitting grooves 111 of the base portion 11 of the other heat sink member 1B facing one heat sink member 1A, the first fin portion 13A and the third fin portion 13C of one heat sink member 1A are fitted. In the fin fitting groove 111C and the fin fitting groove 111A, on the edge of the side plate fitting groove 112 side (on the right side in FIG. 3A) where the first fin portion 13A and the third fin portion 13C are inclined, In the fin fitting groove 111B into which the second fin portion 13B is fitted, the fin fitting groove 111 is formed on the edge of the side plate portion 12 (left side in FIG. 3A) in which the second fin portion 13B is inclined. A slide wall 111a that rises in the inner peripheral direction of the base portion 11 is formed as the distance from the base portion 11 increases.
Then, the fitting end portion 13Ba (which forms the tip of the first to third fin portions 13B (13A, 13C) approaching the fin fitting groove 111 of the base portion 11 of the other heat sink member 1B in a displaced state) 13Aa, 13Ca) come into contact with the slide wall 111a, respectively (FIG. 3B).

When the fitting end portions 13Aa, 13Ba, 13Ca are in contact with the slide wall 111a and one heat sink member 1A and the other heat sink member 1B are brought closer to each other, the fitting end portions 13Aa, which are in contact with the slide wall 111a, 13Ba and 13Ca are guided to the fin fitting groove 111 while moving on the slope of the slide wall 111a against the elasticity of the first fin portion 13A to the third fin portion 13C erected at an angle, and eventually FIG. As shown in (a), the fitting end portions 13Aa, 13Ba, 13Ca are inserted into the fin fitting grooves 111C, 111B, 111A, and the fitting end portion 12a of the side plate portion 12 of the heat sink member 1 is the other base portion 11. It is fitted in the side plate fitting groove 112 provided in.
In this state, the side plate fitting groove 112 of the base portion 11 and the fitting end portion 12a of the side plate portion 12 are fixed by fixing means such as caulking or screws to provide cooling surfaces 11a and 11a on both the upper and lower outer peripheral surfaces. A duct-shaped (cylindrical) heat sink having a substantially rectangular cross section can be manufactured.

Then, in the heat sink of the first embodiment, the fitting end portion 13a fitted in the fin fitting groove 111 resists the restoring force of the fin portion 13 provided so as to be inclined to the base portion 11, and the base portion 11 In order to maintain the fitting in the fin fitting groove 111 of the above, for example, if the second fin portion 13B is described with reference to FIG. 4B, the fitting end portion of the fin portion 13B fitted in the fin fitting groove 111B will be described. A pressing force P1 that strongly presses the side surface (left side surface in the drawing) against the side wall 111b on one side of the fin fitting groove 111B acts on 13Ba, and the side of the side wall 111b pressed by the adjacent fin portion 13 is different. The side surface of the tip of the fin portion is in close contact with the side wall of the insertion groove of the base portion without caulking or the like, and heat can be reliably transferred.

(Second Embodiment)
The heat sink according to the second embodiment is different from the first embodiment in the configuration for pressing the fitting end portion 13a of the fin portion 13 of the heat sink member 1 against the side wall of the fin fitting groove 111. This will be described below.
The same points as in the first embodiment will be omitted.

In the second embodiment, the fin portion 13 of the heat sink member 1 is erected at a right angle to the inner peripheral surface 11b of the base portion 11. The fin fitting groove 111 into which the fin portion 13 is fitted is formed with an inclined surface 111c extending from the bottom surface to the side surface along one side or the other side of the fin fitting groove 111, and the fins are formed by the formed inclined surface 111c. The fitting end portion 13a of the portion 13 is pressed against the side wall of the fin fitting groove 111.

Specifically, as shown in FIG. 5A, the fin fitting groove (first fin fitting groove) 111A closest to the side plate portion 12 among the three fin fitting grooves 111 is shown in FIG. 5B. As described above, an inclined surface 111Ac extending from the bottom surface to the side surface is formed along the side plate portion 12 side of the fin fitting groove 111, and the fin fitting formed on the side plate fitting groove 112 side of the first fin fitting groove 111A. As shown in FIG. 5C, the groove (second fin fitting groove) 111B is formed with an inclined surface 111Bc extending from the bottom surface to the side surface along the side plate fitting groove 112 side of the fin fitting groove 111. As shown in FIG. 5B, the fin fitting groove (third fin fitting groove) 111C formed on the side plate fitting groove 112 side of the second fin fitting groove 111B is the side plate portion of the fin fitting groove 111. An inclined surface 111Cc extending from the bottom surface to the side surface is formed along the 12 side.

Then, in order to connect the heat sink members 1, 1 to each other, when the heat sink members 1, 1 are opposed to each other and brought close to each other, as shown in FIGS. 6A and 6B, the fin portion 13A of one of the heat sink members 1A is formed. , 13B, 13C fitting ends 13Aa, 13Ba, 13Ca are fitted into the fin fitting grooves 111C, 111B, 111A of the other heat sink member 1.
After that, the fin portions 13A, 13B, 13C of one heat sink member 1A are further brought closer to fit the fitting ends 13Aa, 13Ba, 13Ca of the fin portions 13A, 13Ba, 13Ca into the bottom surface of the fin fitting grooves 111C, 111B, 111A of the other heat sink member 1. As a result, as shown in FIGS. 7A and 7B, the fitting end portions 13Aa, 13Ba, 13Ca come into contact with the inclined surfaces 111c formed in the fin fitting grooves 111C, 111B, 111A and move along the inclined surface 111c. Then, the side surfaces of the fitting end portions 13Aa, 13Ba, 13Ca are pressed toward the side wall 111b on one side of the fin fitting groove 111 by the pressing force P2 in the direction of the arrow x2.

At this time, since the inclined surface 111c formed in the fin fitting groove 111 has a different side formed by the adjacent fin fitting groove, the side of the side wall on which the adjacent fin portion is pressed is different, and the heat sink member 1 on one side has a different side. The direction in which the fin portion 13 is pressed is not biased in one direction, and the side surfaces of the fin portions 13 13Aa, 13Ba, 13Ca are the fin fitting grooves 111C, 111B, 111A of the base portion 11 without caulking or the like. Heat can be reliably transferred in close contact with the side walls 111Cc, 111Bc and 111Ac.

Then, in this state, the fitting end portion 12a of the side plate portion 12 of the heat sink member 1 is fitted into the side plate fitting groove 112 provided in the other base portion 11, and the side plate fitting groove 112 and the side plate of the base portion 11 are fitted. By fixing the fitting end portion 12a of the portion 12 with a fixing means such as caulking or a screw, the fitting end portion 13a of the fin portion 13 is pressed against the side wall 111b on one side of the fin fitting groove 111 of the base portion 11. Since the side walls 111b pressed by the adjacent fin portions 13 are different from each other while the close contact state is maintained, the side surface of the tip portion of the fin portion is the fin fitting groove 111 of the base portion 11 without caulking or the like. The heat can be reliably transferred from the fin portion to the base portion in close contact with the side wall.

(Third Embodiment)
In the heat sink member 1 of the heat sink according to the third embodiment, the fin portion 13 of the first embodiment is configured to press the fitting end portion 13a of the fin portion 13 of the heat sink member 1 against the side wall of the fin fitting groove 111. By providing both the configuration of the above and the configuration of the fin fitting groove 111 of the second embodiment, the side surface of the fitting end portion 13a of the fin portion 13 can be strongly and surely pressed against the side wall 111b of the fin fitting groove 111. is there.
Hereinafter, the heat sink of the third embodiment will be described. The description of the same configurations as those of the first and second embodiments will be omitted.

In the heat sink according to the third embodiment, the fin portions 13 formed on the base portion 11 of the heat sink member 1 are provided with the adjacent fin portions 13 and 13 inclined in different directions, and the adjacent fins are provided. An inclined surface 111c extending from the bottom surface to the side surface is formed on the bottom surface of the fitting groove 111 along different sides of the fin fitting groove 111.
Then, in order to connect the heat sink members 1 and 1 to each other, as shown in FIG. 8A, when the heat sink members 1 and 1 are brought close to each other so as to face each other, the first fin portion 13A of one heat sink member 1 is brought close to each other. Alternatively, the fitting end portion 13a of the third fin portion 13C approaches the fin fitting grooves 111C, 111B, 111A provided in the base portion 11 of the other heat sink member 1 in a state of being displaced in the width direction.

Of the fin fitting grooves 111 of the base portion 11, in the fin fitting groove 111C and the fin fitting groove 111A into which the first fin portion 13A and the third fin portion 13C are fitted, the first fin portion 13A and the third fin portion 13A In the fin fitting groove 111B in which the second fin portion 13B is fitted into the edge of the side plate portion 12 side (on the right side in FIG. 8A) in which the fin portion 13C is inclined, the second fin portion 13B is A slide wall 111a that rises in the inner peripheral direction of the base portion 11 as it moves away from the fin fitting groove 111 is formed on the edge of the inclined side plate fitting groove 112 side (left side in FIG. 8A). The fitting end portions 13Ba (13Aa, 13Ca) of the fin portions 13B (13A, 13C) approaching the base portion 11 in a displaced state come into contact with the slide wall 111a, respectively (FIG. 8B).

From the state where the fitting end portions 13Ba (13Aa, 13Ca) shown in FIG. 8B are in contact with the slide wall 111a, when they are further brought closer to connect the heat sink members 1 and 1, they come into contact with the slide wall 111a. The fin fitting groove 111 moves along the slope of the slide wall 111a against the elasticity of the first fin portion 13A to the third fin portion 13C on which the fitting end portions 13Ba (13Aa, 13Ca) are erected at an angle. As shown in FIG. 9A, the fitting end portions 13Aa, 13Ba, 13Ca are fitted into the fin fitting grooves 111C, 111B, 111A, and the fitting end portion of the side plate portion 12 of the heat sink member 1 is fitted. 12a is fitted into the side plate fitting groove 112 provided in the other base portion 11.

Then, the fitting ends 13Aa, 13Ba, 13Ca fitted in the fin fitting grooves 111C, 111B, 111A abut on the inclined surface 111c and move along the inclined surface 111c to move along the inclined surface 111c to form the fin fitting grooves 111C, 111B, 111A. It is pressed against the side wall 111b on one side.
In this state, the side plate fitting groove 112 of the base portion 11 and the fitting end portion 12a of the side plate portion 12 are fixed by fixing means such as caulking or screws to provide cooling surfaces 11a and 11a on both the upper and lower outer peripheral surfaces. A duct-shaped (cylindrical) heat sink having a substantially rectangular cross section can be manufactured.

The fitting end portions 13Aa, 13Ba, 13Ca inserted into the fin fitting groove 111 are fitted and maintained in the fin fitting groove 111 of the base portion 11 against the elastic force of the fin portions 13A, 13B, 13C, and are inclined surfaces. Since the state of being pressed against the side wall 111b on one side of the fin fitting groove 111 by 111c is maintained and the side of the side wall 111b pressed by the adjacent fin portion 13 is different, the fin portion does not need to be crimped or the like. The side surface of the tip portion of the base portion is in close contact with the side wall of the fin fitting groove of the base portion, and heat can be reliably transferred.

(Other embodiments)
As described above, in the first to third embodiments, the adjacent fin portions are pressed to different sides, but some of the fin portions 13 are one of the side wall 111b of the fin fitting groove 111. The remaining fin portion 13 may be pressed against the other side of the side wall 111b of the fin fitting groove 111.
Furthermore, if the heat sink members 1 and 1 are firmly combined with each other by fitting the fitting end portion 12a of the side plate wall 12 and the side plate fitting groove 112, as shown in FIG. 10A, All fin portions 13 may be pressed against the same side of the side wall of the fin fitting groove 111 by a pressing force in the same direction x3.

Further, the cross-sectional shape of the heat sink is not limited at all, and the heat sink members constituting the heat sink may not have the same shape but may connect heat sink members having different shapes.
For example, as shown in FIG. 10B, in one heat sink member 1, only a plurality of fin portions 13 are formed in a base portion 11 made of a plate-shaped member, and the base portion 1 of the other heat sink member 1 It may be connected to form a heat sink by being fitted into the fin fitting groove 111. In this case, the outer peripheral surface of the other heat sink member 1 can be used as the cooling surface 11a on which the heating element is arranged.
That is, in the heat sink of the present invention, at least the fin portion 13 is provided on the base portion of one heat sink member 1, and at least the fin fitting groove 111 is provided on the base portion of the other heat sink member to connect them. It suffices as long as the heat sink is formed by.

As described above, in the heat sink of the embodiment of the present invention, at least one heat sink member having a base portion and a fin portion and at least the other heat sink member having a base portion and a fan fitting groove are opposed to each other. By combining with, the heat sink is formed in a state where the fin portion formed on one heat sink member is pressed against the side wall on one side of the fin fitting groove formed on the other heat sink member, so that the fin portion and the fin fitting are formed. The heat can be reliably transferred by bringing it into close contact with the groove.

In the above embodiment, the heat sink including the main fin portion 131 and the sub fin portion 132 has been described as the fin portion 13, but the configuration of the cooling portion of the fin portion is not limited at all. The present invention can also be applied to a heat sink having no sub-fin portion as shown in FIGS. 10 (a) and 10 (b).
Further, the configuration in which the fin portion is pressed against the side wall of the fin fitting groove is not particularly limited.

1: Heat sink member 1A: Heat sink member 1B: Heat sink member 11: Base portion 11a: Cooling surface 11b: Inner peripheral surface 12: Side plate portion 12a: Fitting end portion 13: Fin portion 13a: Fitting end portion 111: Fin fitting groove 111a : Slide wall 111b: Side wall 111c: Inclined surface 112: Side plate fitting groove 122: Fitting portion 131: Main fin portion 132: Sub fin portion

Claims (1)

A heat sink that is a combination of multiple heat sink members.
One heat sink member has at least a base portion and a plurality of plate-shaped fin portions provided on one surface of the base portion, and the other heat sink member has at least one base portion and one base portion. A plurality of fin fitting grooves provided on the surface are provided, and
One surface of the base portion of one heat sink member and the other heat sink member face each other, and the tip of the fin portion provided on the one heat sink member fits into the fin fitting groove provided on the other heat sink member. And combined,
One fin portion is pressed against one of the side walls of the fin fitting groove while being fitted into the fin fitting groove, and the other fin portion adjacent to the one fin portion is fitted into the fin fitting groove. A heat sink characterized in that one fin portion of the fitting groove is pressed against the side wall opposite to the side wall to which it is pressed .

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