JP3140955B2 - Heat sink device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink device mounted on a heat sink surface of a heating element.

[0002]

2. Description of the Related Art In recent years, with the increase in the density of LSI elements such as CPUs, the cooling method is becoming a serious technical problem. Is attracting attention.

[0003] As a heat sink device for cooling a heat-generating element such as a high heat-generating element serving as a target in a spot manner, a heat sink device shown in FIG. 12 has been conventionally proposed. In this conventional example, 1 is a heat sink body formed of a material having good heat conductivity such as aluminum, 4 is an axial fan device, and 2 is a cover. Is forcibly introduced into the inside of the heat sink device from the upper surface of the heat sink device,
The air is exhausted from the four side edges through the space between 0, 10,... And cools the heat sink body 1 mounted on the heating element (not shown) in the middle of the exhaust.

[0004]

However, in the above-mentioned conventional example, the fan device 4 has the following disadvantages because an axial fan is used.

[0005] First, cooling air is introduced into the fan device 4 through the opening 41 at the upper portion of the fan device 4. If the obstacle wall 8 such as the inner wall surface of the housing exists near the opening 41, the pressure loss becomes large and cooling takes place. The air volume decreases and cooling performance cannot be exhibited. For this reason, it is necessary to increase the distance from the opening 41 to the obstacle wall 8, and the effective mounting height increases.

Further, the cooling air whose temperature has risen by cooling the high heat generating element is discharged to the outside from the side wall of the heat sink device, and this warm air is again sucked into the heat sink device by the same fan device 4. In many cases, the cooling performance is reduced.

On the other hand, in order to eliminate the sneak of warm air,
As shown in FIG. 13, there has been proposed a fan device 4 mounted on the side wall of the heat sink body 1 to blow cooling air in a direction indicated by a broken line arrow. Since the width dimension W cannot be reduced below a certain limit, there is a disadvantage that the mounting height is increased.

An object of the present invention is to solve the above-mentioned drawbacks, and an object of the present invention is to provide a heat sink device capable of reducing a mounting height.

[0009]

According to the present invention, an object of the present invention is to provide a heat sink main body in which an outside air is forcibly introduced into an air passage formed by a heat sink body and a cover by a fan device arranged in the air passage. A heat sink device for cooling a heating element to be mounted, wherein the fan device includes:
The fan has a suction direction and an exhaust direction on the tangent to a circle centered on the rotation axis of the rotor , and the fan device rotates by the rotor.
Close the gap between the bottom of the body and the bottom of the heat sink body.
This is achieved by providing a heatsink device that is placed in a position .

The heat sink body 1 is made of aluminum or the like.
The heating element 5 is formed of a material having good thermal conductivity and is mounted on a heating element 5 such as a heating element or a PC card.
To cool.

The cover 2 forms a ceiling wall surface of the heat sink device, and the cover 2 forms a ventilation path 3 for cooling air between the cover 2 and the heat sink body 1. In order for the cooling air to be cooled over a wide area,
It is desirable to increase the formation area of the ventilation passage 3, and for this purpose, it is desirable that the cover 2 be formed in a size that covers almost the entire upper part of the heat sink body 1.

The fan device 4 used in the present invention is shown in FIG.
As shown in the figure, the rotor 40 is provided around the rotation axis, and is different from a so-called axial fan having a blowing direction in a direction parallel to the rotation axis in that air is blown in the rotation direction of the rotor 40. is there.

The phrase "having a blowing direction in the direction of rotation of the rotor 40" means that the amount of air in the direction of rotation is greater than the amount of air in the direction of the axis of rotation. This does not mean that the fan device 4 does not exist at all, and such a fan device 4 can be generally achieved by projecting a rotor 40 having no twist in the axial direction, provided that the air flow in the centrifugal direction is larger. It is also possible to impart a twist to include a component that collides with the upper surface of the heating element 5, and a specific shape can be experimentally determined.

The fan device 4 can be arranged in the air passage 3 by supporting the rotating shaft on a bearing formed on the heat sink body 1 or the cover 2. As shown in FIG. 3B, the upper and lower ends 4 of the rotor 40
It is desirable that the clearances between Oa, 40b, cover 2 and heat sink body 1 be as small as possible.

With the above configuration, the outside air is forcibly introduced and discharged into the ventilation passage 3 by the fan device 4 to cool the heating element 5. The cooling air is introduced from the side wall of the heat sink device, flows in the horizontal direction, and is discharged from the other side wall.

By using the above-described fan device 4, it is possible to form both the inlet 60 and the outlet 61 of the cooling air on the side wall of the heat sink device.
By forming the introduction part 60 on the side wall part, no extra space is required on the upper part of the heat sink device, and the height can be reduced.

Both the introduction section 60 and the discharge section 61 are formed on the side wall of the heat sink device, and the introduction section 60
When the cooling air from the nozzle moves in the horizontal direction, the warm air exhausted from the discharge unit 61 is less likely to be sucked again from the introduction unit 60, and the cooling efficiency is improved. Note that in order to more effectively prevent warm air from sneaking around,
It is desirable to form the introduction part 60 and the discharge part 61 on the opposite side edge part.

According to the second aspect of the present invention, the heat sink device is mounted on the heat sink body 1 provided with a plurality of radiating fins 10, 10,... A fan device for sending wind in the direction of rotation of the rotary blades; and a cover for covering an upper surface of the heat sink body and forming a ventilation passage for cooling air in cooperation with the heat sink body. The cooling air flow flowing between the radiation fins 10, 10,... Is forcibly formed by the device 4.

A fan housing area 11 for housing the fan device 4 is formed in the heat sink body 1, and a plurality of radiating fins 10, 10,... A ceiling wall is provided by the cover 2 in the fan storage area 11 and the standing area of the radiation fins 10, and the ventilation path 3 is formed.

As described above, the upper and lower ends 40a, 4a,
It is desirable to reduce the gap between the cover 0b, the cover 2 and the heat sink body 1, but as proposed by the invention of claim 3, the upper part of the rotor 40 of the fan device 4 is housed on the back surface of the cover 2. When the recess 20 is formed (see FIG. 3B), it is possible to substantially eliminate the gap between the upper end 40a of the rotor 40 and the cover 2.

The flow direction of the cooling air by the fan device 4 is as follows.
In the case where one fan device 4 is used, the cooling air can be blown in all directions by arranging the fan device 4 at the center of the heat sink body 1 when the fan device 4 is used. It is.

On the other hand, when it is necessary to restrict the cooling air flow dispersed in all directions to a limited direction and increase the amount of cooling air, the rotating blades 4 of the fan device 4 are structured as described above.
It is desirable to surround the periphery of 0 with an arc-shaped wall surface 7.

As shown in FIG. 1, the arc-shaped wall surface 7 is provided so as to exclude the cooling air introduction portion 60 and the discharge portion 61, and guides the cooling air toward the arc-shaped wall surface 7 in a certain direction. To increase the air volume on the downstream side.

In this case, as described in claim 5,
When a through-hole 70 communicating with the outside of the ventilation path 3 is formed in the arc-shaped wall surface 7, it is possible to reduce pressure loss. In the invention according to claims 6 to 10, an effective change for improving the air volume and the wind speed in the ventilation path 3 is proposed.
That is, in the invention according to claim 6, the fan device 4
Are provided in such a manner that the air blowing directions at the portions where the rotation trajectories of the rotating blades 40 approach each other coincide.

By arranging a plurality of fan devices 4 so as to face each other and matching the air blowing direction at a portion where the rotation trajectory of the rotor 40 approaches, the cooling air at the opposing position of the fan devices 4 is strengthened mutually. Since the air is sent to the downstream side while matching, the air volume and the wind speed are increased.

By using a plurality of fan devices 4 to increase the amount of air flow in one direction, the necessity of arranging the fan devices 4 at the center of the heat sink body 1 is reduced. In this way, efficient cooling to the central part that generates the most heat is possible.

In the present invention, by using the above-described arc-shaped wall surfaces 7 together, the direction of the cooling air can be further restricted, so that the cooling efficiency can be further improved.

In the invention according to claim 7 shown in FIG. 1, two fan devices 4 are provided symmetrically with respect to the center line of the heat sink body 1. Further, in the invention according to claim 8, the fan device 4 is provided with the adjacent rotor 40
Are arranged such that their rotation trajectories overlap each other. By rotating both in a state in which the rotation trajectories are superimposed, there is no ventilation loss area as compared with the case where a gap is provided between the rotation trajectories, so that the ventilation efficiency can be improved.

Further, in order to rotate the rotor blades 40 of the plurality of fan devices 4 whose rotational trajectories overlap each other without interfering with each other, for example, from the initial position where they do not interfere with each other at the overlapping portion, they are rotated at the same rotational speed. Although it can be achieved by rotating, it is desirable to separate the rotation area of the rotor blades 40 of the adjacent fan device 4 in the vertical direction (see FIG. 6B). Under the configuration, the trouble of controlling the rotation speeds of the plurality of fan devices 4 in the same manner is omitted.

The rotation timing of both fan devices 4 is synchronized so that when the blade 40 of one fan device 4 enters the overlapping portion of the rotation trajectory, the blade 40 of the other fan device 4 also enters simultaneously. In this case, since the loss at the polymerization site is reduced as much as possible, it is possible to dramatically improve the blowing capacity.

Further, in the invention according to claim 10,
The arcuate wall surface 7 is provided with a protrusion 71 for replenishing the rotating area of the rotor 40 of another adjacent fan device 4. As shown in FIG. 6 (b), the protrusion 71 is vertically
Is displaced to prevent the formation of a gap between the non-formation area and the arc-shaped wall surface 7 in a state where the area is formed so as to fill the lower or upper non-formation area of the rotor 40. , Is provided in order to eliminate the blowing loss due to the gap. Therefore, it is desirable that the protrusion 71 be formed so as to approach the rotating area of the rotor 40 as much as possible without interfering with the rotor 40.

In the eleventh aspect, a modification suitable for a case where a plurality of heating elements 5, 5,... Is arranged is proposed. In other words, in the present invention, as shown in FIG. By making the introduction part 60 and the blowing direction of the cooling air orthogonal to each other,
As shown in FIG. 8, the warm air discharged to the downstream side is not directly sucked from the upstream side of another heat sink apparatus A disposed downstream thereof, and each heat sink apparatus A,
The cooling efficiency in A .. is improved.

[0033]

1 to 3 show a heat sink device according to the present invention. In the figure, 1 is a heat sink body, 5 is a joining terminal 50 to a printed board (not shown),
The heat sink body 1 is made of a material having good thermal conductivity, such as aluminum, and has a fan housing area 11 formed on almost one half thereof, and a heat sink body 11 formed in the remaining area. Are formed with a plurality of pin-shaped radiation fins 10, 10,....

Reference numeral 4 denotes a fan device mounted in the fan storage area 11, and includes a plurality of rotating blades 4 bent in the same direction.
By rotating 0, 40,... In the direction of the arrow indicated by the solid line in FIG. 1, the cooling air is blown almost radially. Unlike the axial fan, in order to generate a large amount of cooling airflow in the rotation direction of the rotor 40, it is effective to increase the cross-sectional area of the rotating body formed by each rotor 40, as shown in FIG. As described above, it is desirable that the shape of the rotary wing 40 be rectangular. Further, the gap between the bottom surface of the rotating body and the bottom portion of the heat sink body 1 by the rotating wings 40 becomes a dead space that does not contribute to the ventilation,
It is desirable that the lower edge 40 b of the rotor 40 be as close as possible to the bottom surface of the heat sink body 1.

The fan device 4 includes the heat sink body 1
Are installed at line-symmetric positions with respect to the center line of the fan device 4, and the rotating blades 40 of each fan device 4 are driven to rotate in the direction in which the air blowing direction at the portion where the rotational trajectory approaches approaches.

Numeral 7 denotes a semicircular arc-shaped wall provided so as to cover substantially a half-circumferential portion of the fan device 4 disposed opposite to the fan device 4, and a gap between the end 40c of the rotary blade 40 and the arc-shaped wall 7 is formed. It is arranged as close as possible to the rotation trajectory of the rotor 40 (see FIG. 3B).

Reference numeral 2 denotes a cover 2 which covers the entire upper surface of the heat sink body 1 and forms a cooling air passage 3 between the fan storage area 11 and the radiation fins 10, 10,. As shown in FIG. 2, the cover 2 is a flat plate member having substantially the same area as the heat sink body 1, and has two block portions 9, 9, which provide an arc-shaped wall surface 7, and radiation fins 10, 10. It is fixed to the heat sink body 1 by a screw (not shown) or the like screwed in between.

As with the lower edge 40b of the rotor 40 approaching the bottom surface of the heat sink body 1, the upper edge 40a of the rotor 40 approaches the back surface of the cover 2 as much as possible, as a result of the dead space at the time of air blowing. However, in the present embodiment, as shown in FIG.
On the back surface of the cover 2, a concave portion 20 is provided such that the upper portion of the rotary wing 40 fits therein.

Therefore, in this embodiment, when the rotating blades 40, 40,... Of each fan device 4 are rotated in the direction of the arrow, the cooling air flows from the front introduction portion 60 as shown by the dashed arrow in FIG. After being forcibly introduced into the ventilation passage 3, it is discharged to the outside through the radiation fins 10, 10... And cools the heating element 5 on the way.

The blowing direction of the cooling air is not limited to the direction shown in the figure. As shown in FIG.
The air may be exhausted from the fan storage area 11 side.

Further, as shown in FIG.
In addition, if the through-hole 70 to the outside is perforated, the pressure loss at the arc-shaped wall surface 7 can be reduced, so that the blowing efficiency can be further improved.

FIG. 6 shows another embodiment of the present invention. In this embodiment, the amount of air blown from the fan device 4 is increased, and the two fan devices 4 and 4 are arranged close to each other so that their rotation trajectories overlap each other. The rotating blades 40 of each fan device 4 are provided at any one of the upper and lower halves of the rotating area in order to prevent interference during rotation.

That is, in FIG. 6, the rotor 40 of the fan device 4 located on the left side is provided mainly in the lower area, and the rotor 40 of the fan device 4 located on the right side
It is provided in the upper area.

Further, when the above-mentioned rotary blade 40 is rotated, a dead space is generated between the rotating blade 40 and the corresponding arc-shaped wall surface 7. A part 71 is provided.

FIG. 7 shows a third embodiment of the present invention.
This embodiment shows an effective change when a plurality of heat sink devices A, A,... Are arranged in a matrix as shown in FIG. A blocking wall 90 having an arc-shaped wall surface 7 formed on the side surface is provided, and the blocking portion 9 is
The introduction side 60 is formed by opening the 0 side to the outside.

Therefore, in this embodiment, the cooling air is taken into the heat sink device from the boundary between the closing wall 90 and the block portion 9 and faces the fan housing area 11 while cooling the radiating fins 10, 10,. Exhausted from the margins. At this time, since the heat sink device arranged on the downstream side does not directly draw in warm air, a decrease in cooling efficiency of the heat sink device on the downstream side is prevented.

In FIGS. 7 and 8, the radiation fins 1 are shown.
Although the case where the discharge port is set to the 0 side is shown, it is also possible to make the relation reverse as shown in FIGS. In the above description, only the case where two fan devices 4 are provided has been described. However, as shown in FIG.
It is also possible to provide one.

[0048]

As described above, according to the present invention, a heat sink device having a low height and high cooling efficiency can be obtained.

[Brief description of the drawings]

1A and 1B are diagrams showing the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a side view.

FIG. 2 is an exploded perspective view of FIG.

3A and 3B are views showing a cover, wherein FIG. 3A is a rear view and FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A.

FIG. 4 is a diagram showing a modification of FIG. 1;

5A and 5B are diagrams showing another modification of FIG. 1, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

FIG. 6 is a diagram showing a second embodiment of the present invention, in which (a)
Is a plan view, and (b) is a sectional view taken along line BB of (a).

FIG. 7 is a diagram showing a third embodiment of the present invention, in which (a)
FIG. 2 is a plan view showing a state where a cover is removed, and FIG. 2B is a side view showing a state where the cover is attached.

FIG. 8 is a diagram showing a flow of cooling air.

FIG. 9 is a diagram showing a modification of FIG. 7;

FIG. 10 is a diagram showing a flow of cooling air.

FIG. 11 is a diagram showing a modification of the present invention.

FIG. 12 is a diagram showing a conventional example.

FIG. 13 is a diagram showing another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat sink body 10 radiating fin 11 fan storage area 2 cover 20 concave portion 3 ventilation path 4 fan device 40 rotating blade 5 heating element 60 introduction section 61 discharge section 7 arc-shaped wall surface 70 through hole 71 projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/20

Claims (9)

(57) [Claims] 1. A heat sink device for forcibly introducing outside air into a ventilation path formed by a heat sink body and a cover by a fan device disposed in the ventilation path, thereby cooling a heating element to which the heat sink body is attached. The fan device has an intake direction and an exhaust direction on a tangent to a circle centered on the rotation axis of the rotor , and the fan device has a heater and a bottom surface of the rotor by the rotor.
A heat sink device arranged close to the bottom of the tosink body . 2. A heat sink body mounted on a heating element and having a plurality of radiating fins on an upper surface, and mounted on a fan storage area formed on the heat sink body.
Is rotated in the horizontal direction in plan view in the mounted state
A fan device that sends cooling air in the direction of rotation of the rotor blades by the blades; and a cover that covers the upper surface of the heat sink body and forms a ventilation path for the cooling air in cooperation with the heat sink body. A heat sink device that forcibly forms a cooling airflow that flows between the fins. 3. The heat sink device according to claim 1, wherein a concave portion for accommodating an upper portion of a rotor blade of the fan device is formed on a back surface of the cover. 4. The heat sink device according to claim 1, wherein the periphery of the rotor blade of the fan device is surrounded by an arc-shaped wall surface except for a cooling air introduction portion and a discharge portion. 5. The heat sink device according to claim 4, wherein a through hole communicating with the outside of the ventilation passage is formed in the arc-shaped wall surface. 6. A heat sink formed by a heat sink body and a cover.
The fan device arranged in the ventilation path
External air is forcibly introduced and the heat sink body is attached.
A heat sink device for cooling a heat body, wherein the fan device has a circular contact centered on a rotation axis of a rotor blade.
A heat sink device having a suction direction and a discharge direction on a line, and a plurality of heat sink devices provided so that a blowing direction at a portion where a rotation trajectory of a rotor approaches is close. 7. The heat sink device according to claim 6, wherein the two fan devices are provided symmetrically with respect to the center line of the heat sink body. 8. The heat sink device according to claim 6, wherein rotation trajectories of adjacent rotor blades of the fan device overlap each other. 9. The cooling air introduction part is cooled by a fan device.
The opening is provided in a direction orthogonal to the wind blowing direction.
9. The heat sink device according to any one of 1 to 8 .