JP3081133B2 - Heat sink device with fan - 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 with a fan.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a conventional example of a heat sink device with a fan in which a fan device is mounted on a heat sink body.
Shown in

In the conventional example shown in FIG. 9, a fan device 2 is mounted at the upper center of a heat sink body 1 formed of a material having excellent thermal conductivity such as an aluminum alloy.
The cooling air forcibly introduced into the heat sink body 1 by the fan device 2 passes between the radiation fins 3, 3... Air is exhausted from the edge to the outside of the heat sink body 1. In FIG. 9, reference numeral 101 denotes a lead of the heating element 100, and reference numeral 102 denotes a mounting board on which the heating element 100 is mounted.

However, the heat sink device with a fan according to this conventional example has a drawback that the overall height of the device is increased because the fan device 2 is mounted on the heat sink body 1.

In order to solve such a disadvantage, as shown in FIG. 10, a fan housing portion 4 is formed in the center of the heat sink body 1 and the fan device 2 is housed in the fan housing portion 4. In this case, however, in this case, since the size of the fan device 2 is reduced as compared with the conventional example shown in FIG.
However, there is a drawback that the cooling capacity is limited when the heat generation amount of the heating element 100 is increased by further improving the degree of integration of 0 or adopting a multi-chip module having a plurality of heating sections.

Further, in the above two conventional examples, since the fan device 2 is disposed at the center of the heat sink body 1, the center of the heat generating element 100, which is the heat generating portion, is a dead zone for the cooling air flow. This has the disadvantage that a sufficient cooling effect cannot be expected.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat sink device with a fan which can drastically improve the cooling capacity of a heating element. I do.

[0008]

According to the present invention, there is provided the above object.
Is formed of a material having good thermal conductivity, and the heat sink body which projects a plurality of heat radiation fins on the upper surface, and a plurality of fan units, each of which is housed in the plurality of fan housing section formed in the heat sink body Yes The fan device has a rotating
When driving the blades, the bottom wall side of the heat sink body is set to the exhaust direction.
Mixed fan units and fan units with opposite exhaust directions
This is achieved by providing a heat sink device with a fan to be used.

[0009]

In the present invention, by mounting a plurality of fan devices 2, 2,... On the heat sink body 1, the total air volume increases and the cooling air from each fan device 2 complements each other. A dead area for cooling air is prevented from being generated on the heat sink body 1, and overall cooling efficiency is improved. Furthermore, by using a plurality of fan devices 2, even if one of them stops due to a failure or the like, it is possible to prevent the cooling performance from being completely lost, thereby improving the reliability of the device.

The fan device 2 is connected to the heat sink body 1
By being stored in the fan storage section 4 formed in the above, the thickness of the entire apparatus can be reduced. In the invention according to claims 2 and 3, the fan device 2 having the bottom wall 10 side of the heat sink body 1 as the exhaust direction when the rotor 5 is driven, the fan device 2 having the opposite exhaust direction, or the same exhaust direction, In addition, since the fan devices 2 having the rotating blades 5 having different rotation directions are used in a mixed manner, the plurality of fan devices 2 perform a push-pull operation mutually to reduce the cooling efficiency by the cooling air flow on the heat sink body 1. Improve.

In the invention according to claim 4, the interference prevention wall 60 prevents mutual interference between the cooling winds forcedly introduced by the respective fan devices 2, 2,..., And the respective regions defined by the interference prevention wall 60 Can be surely cooled by the corresponding fan device 2.

The number of the fan devices 2 to be used is determined by the size of the heat sink body 1 or the heating element 100 and the heat generation amount of the heating element 100. When two fan devices 2 are used, By disposing the heat sink body 1 at a symmetrical position with respect to the center thereof, uniform cooling over the entire surface of the heat sink body 1 becomes possible.

When disposing the fan device 2 at a symmetrical position, the radiating fins 3 formed on the heat sink body 1 are
If the fan device 2 is arranged at a line symmetric position with respect to a line connecting the rotation centers of the fan device 2, more uniform cooling is possible.

Further, when the two fan devices 2 and 2 are arranged at diagonal positions of the heat sink body 1, a closing wall 6 is formed at a corner of the heat sink body 1 where the fan device 2 is arranged. It is preferable that the closing wall 6 is provided with the heat sink body 1 to which the cooling air sent from the fan device 2 is close.
To prevent the air from being immediately exhausted to the outside from the peripheral side of the.

Further, when the fan cover 8 is fixed on the upper surface of the heat sink body 1, a cooling air wind tunnel is formed between the bottom wall 10 of the heat sink body 1 and the fan cover 8, and the cooling air flows through the heat sink body 1 , Formed between the radiating fins 3, 3,..., Can be stably cooled.

The venturi cylindrical portion 9 formed on the back surface of the fan cover 8 narrows the flow of the cooling air, thereby increasing the wind speed and contributing to the improvement of the cooling capacity.

[0017]

FIG. 1 shows an embodiment of the present invention, wherein 1 is a heat sink body, and 2 is a fan device. The heat sink body 1
The bottom wall 10 is formed of a material having good thermal conductivity such as an aluminum alloy, and is used by fixing the bottom wall 10 to the heat sink surface of the heating element 100. The heat sink body 1 includes a large number of pin-shaped radiating fins 3, 3.
The fan housings 4 are formed at a plurality of locations by lowering the height of the radiation fins in a predetermined area, and the fan device 2 is mounted in each fan housing 4.

In FIG. 1, reference numeral 101 denotes a heating element 10.
A lead 0 and 102 indicate a mounting board on which the heating element is mounted. In this embodiment, the fan housing 4 is provided with a radiation fin 3 ′ which is lowered so as not to interfere with the rotor 5, thereby improving the heat exchange efficiency below the rotation region of the rotor 5. Although it is configured as described above, it is also possible to configure so that the radiating fins 3 ′ are not arranged at all in the fan housing portion 4. In this case, the rotation axis length of the fan device 2 can be shortened, The displacement of the wings 5 can be reduced as much as possible.

The fan device 2 is formed with a rotating blade 5 fixed around a rotation axis. When the fan device 2 is mounted on the heat sink body 1, the rotation shaft is embedded in a bottom wall 10 of the heat sink body 1. (Not shown).

The number of the fan housings 4 and the width of each fan housing 4 can be appropriately determined in consideration of the size of the fan device 2 used and the size of the heat sink body 1. The radiating fins 3, 3... That are sufficient to secure the rotation area of the rotor 5 of the device 2 and sufficient to efficiently exchange heat with the cooling air from the fan device 2.
Is determined to surround the fan device 2.

Arranging the plurality of fan housings 4 at line-symmetric or point-symmetric positions with respect to the center of the heat sink body 1 is effective for cooling the entire heat sink body 1 substantially uniformly, and the minimum number of fans In order to perform more efficient cooling by the device 2, it is effective to form two fan housings 4 at diagonal positions and mount the fan devices 2 in the respective fan housings 4, as shown in FIG. is there. Further, in this case, when the radiation fins 3 are arranged at a line symmetric position with respect to a line connecting the rotation center of the fan device 2, the cooling locations can be made more uniform.

The plurality of fan devices 2 housed in the fan housing portion 4 are not necessarily limited to those having the same specifications. For example, fan devices 2 having different powers may be mixed, or the fan devices 2 shown in FIG. As shown in (b), the fan device 2 whose cooling air is discharged toward the bottom wall 10 of the heat sink body 1 and the fan device 2 whose direction is opposite, that is, upward from the bottom wall 10 of the heat sink body 1. It is also possible to use a mixture of the fan devices 2 having different discharge directions in this way, and the cooling air forcedly introduced into the heat sink body 1 by one of the fan devices 2 Since the cooling fan is forced to be exhausted by the other fan device 2 while cooling the radiating fins 3 while passing through the space, the overall cooling efficiency can be improved. In FIG. 1B and FIG. 2B, the direction in which the cooling air is discharged from the fan device 2 is indicated by white arrows in the drawings.

As shown in FIG. 2, when a pair of fan devices 2, 2 having the same cooling air discharge direction and opposite rotation directions are used in a mixed manner, the pair of fan devices 2 Since the cooling air is blown from the two fan devices 2 in the vicinity of the central portion of the facing position, for example, the heating element 100 and the like having the heating portion disposed at the center can be efficiently cooled. In FIG. 2B, the direction in which the cooling air is discharged is directed toward the bottom wall 10 of the heat sink body 1, but the fan device 2 having the opposite discharging direction may be used. It is possible.

The method of assembling the fan devices 2 can be appropriately changed in consideration of the cooling air flow on the heat sink body 1 in addition to the above-described method.
Is used, for example, when four fan devices 2, 2,... Are used as shown in FIG. 3, the specifications of the fan devices are determined so that the cooling air is drawn out from the center of the heat sink body to the outside. It is also possible. In FIG. 3, the direction of rotation of the rotor blades 5 of the fan device 2 is indicated by solid arrows, and the direction of flow of cooling air is indicated by broken arrows.

FIG. 4 shows a second embodiment of the present invention. In the following description of the embodiments, the same components as those in the above-described embodiments are denoted by the same reference numerals in the drawings, and description thereof will be omitted. In this embodiment, an interference prevention wall 60 is disposed at an intermediate portion between the fan devices 2 and 2. The interference prevention wall 60 is particularly effective when the heating element 100 generates a large amount of heat or has a plurality of heat generating portions, and prevents interference between cooling winds forcedly introduced into the heat sink body 1 by the fan device 2. The areas defined by the interference prevention walls 60 are reliably cooled by the fan devices 2 arranged in the respective areas.

The anti-interference wall 60 can be provided directly on the bottom wall 10 of the heat sink body 1, or can be provided on the fan cover 8 described later. Furthermore, the anti-interference wall 60 is provided in FIG.
5A, the heat sink body 1 is divided so as to include a plurality of fan devices 2 as shown in FIG. May be used. In FIG. 5, the direction of rotation of the rotor blades 5 of the fan device 2 is indicated by solid arrows, and the direction of flow of cooling air is indicated by broken arrows.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, a fan cover 8 is fixed to the upper surface of the heat sink body 1. The fan cover 8 is a plate-like body provided with an intake / exhaust port 7 corresponding to the fan device 2 and is fixed to the heat sink body 1 by a fastener such as a screw (not shown). Various materials such as synthetic resin and metal can be used for the material of the fan cover 8, but when the fan cover 8 is formed of a material having excellent thermal conductivity such as metal, the fan cover 8 should be used as a heat radiating surface. When such a configuration is adopted, it is desirable that the tip of the radiation fin 3 and the back surface of the fan cover 8 be in close contact with each other, or that a heat transfer sheet or the like be interposed at the boundary.

Further, a venturi cylinder 9 is projected from the back surface of the peripheral portion of the intake / exhaust port 7 of the fan cover 8. The venturi tube portion 9 is particularly effective when the fan device 2 in which the cooling air is discharged to the heat sink body 1 is used. It acts to improve the efficiency and is arranged to surround the rotation trajectory of the tip of the rotor blade 5 of the fan device 2.

When the fan cover 8 is provided as in the present embodiment, the fan device 2 does not necessarily need to be held on the heat sink body 1 side, but can be held by hanging from the fan cover 8. When the fan device 2 is held on the side of the fan cover 8, the short heat radiation fins 3 can be arranged in the fan housing 4 without increasing the length of the rotating shaft. Improved cooling efficiency is provided.

As a means for holding the fan device 2 to the fan cover 8, an appropriate fixing means is formed on the fan device 2,
A method of fixing to the fan cover 8 via the fixing means can be adopted.

FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, the fan device 2 is arranged at a diagonal position of the heat sink main body 1 and symmetrically with respect to the center. Is formed. The closing wall 6 is immediately discharged from the immediate periphery without the cooling air introduced by each fan device 2 located at an eccentric position with respect to the center of the heat sink body 1 being introduced into the center of the heat sink body 1. It is provided to prevent that.

FIG. 8 shows a state in which the fan cover 8 is mounted on the heat sink device with a fan according to the present embodiment, and a venturi tube portion 9 is formed on the back surface of the fan cover 8. In this embodiment having the closing wall 6 at the corner, the closing wall 6 also performs the function of the Venturi tube 9 at the same time, so that the Venturi tube 9 on the side of the fan cover 8 is provided only in an area not surrounded by the closing wall 6. It is enough if provided.

[0033]

As is apparent from the above description, according to the present invention, it is possible to obtain a sufficient cooling capacity for surely cooling a heating element having a large amount of heat, such as a multichip.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, wherein (a) is a plan view,
FIG. 2B is a sectional view taken along line BB of FIG.

FIGS. 2A and 2B are views showing a modification of FIG. 1, wherein FIG.
FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 3 is a diagram showing a modification of FIG. 2;

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a modification of FIG. 4;

6A and 6B are views showing a third embodiment of the present invention, wherein FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line BB of FIG. 6A.

FIG. 7 is a view showing a fourth embodiment of the present invention, wherein (a) is a plan view and (b) is a front view.

8A and 8B are views showing a modification of FIG. 7, wherein FIG.
FIG. 9B is a sectional view taken along line BB of FIG.

9A and 9B are views showing a conventional example, in which FIG. 9A is a plan view and FIG. 9B is a front view.

FIG. 10 is a view showing another conventional example, in which (a) is a plan view,
(B) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat sink body 10 Bottom wall 2 Fan device 3 Radiation fin 4 Fan storage part 5 Rotor blade 6 Closing wall 60 Interference prevention wall 7 Intake / exhaust port 8 Fan cover 9 Venturi cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01L 23/467 H01L 23/36

Claims (9)

(57) [Claims] 1. A heat sink body formed of a material having good thermal conductivity and having a plurality of radiating fins protruding from an upper surface thereof, and a plurality of fan devices respectively housed in a plurality of fan housing portions formed in the heat sink body. It has the door, the fan unit, the heat sink present at the time of driving the rotating blades
A fan device with the bottom wall side as the exhaust direction,
A heat sink device with a fan in which a reverse fan device is used together . 2. Each fan is provided on an upper portion of a bottom wall of the heat sink.
Prevent interference between cooling air forcedly introduced by the device
The heat sink device with a fan according to claim 1, wherein an interference prevention wall is arranged . 3. The center of the heat sink body according to claim 3.
The heatsink device with a fan according to claim 1 or 2, wherein two heatsink devices are arranged symmetrically with respect to the fan. 4. A heat radiation fin formed on a heat sink body.
Is a line symmetric position with respect to the line connecting the rotation centers of the fan units.
The heat sink device with a fan according to claim 3, wherein the heat sink device is arranged in a position . 5. A fan unit comprising: a pair of heat sink bodies ;
The two fan units are arranged at the corner positions and
A closed wall is formed at the corner of the heat sink body
The heat sink device with a fan according to claim 3 or 4, wherein the heat sink device has a fan. 6. A fan on the upper surface of the heat sink body.
The fan cover with the intake and exhaust ports of the device is fixed.
A heat sink device with a fan according to claim 1 . 7. A fan device is provided on a back surface of said fan cover.
Venturi cylinder surrounding the rotating trajectory of the rotor
The heat sink device with a fan according to claim 6, wherein 8. A fan cover having an intake / exhaust port of a fan device is fixed to an upper surface of the heat sink body.
At the same time, a blocking wall is provided on the back of the fan cover.
Fan that surrounds the rotation trajectory of the impeller
7. The heat sink device with a fan according to claim 6, wherein the tulip tube portion is provided in a protruding manner . 9. The fan device is held by a fan cover.
9. The heat sink with a fan according to claim 6, 7 or 8, wherein the heat sink has a fan.