JP4875453B2 - Heat sink with centrifugal fan for heat dissipation - Google Patents

Description

  The present invention relates to a heat sink with a centrifugal fan provided with a radiating fin portion, and more particularly to a heat sink excellent in heat radiating efficiency that suppresses the flow of wind in the opposite direction to the wind passing from the centrifugal fan through the radiating fin portion.

  A heat generation amount and a heat generation density of a heat generating portion such as a CPU and an element mounted on a substrate are increased, and a high performance heat sink that efficiently dissipates them is demanded. In personal computers as well, CPUs, graphic chips (GPU or VGA), chipsets and other elements that require active heat dissipation have increased. On the other hand, a reduction in thickness has been demanded.

As the amount of heat generation increases, it becomes difficult to cope with the combination of the radiation fin and the heat pipe, and a method of forcibly radiating the heat of the heating element moved to the radiation fin by the heat pipe by the fan has been adopted.
That is, a heat sink with a centrifugal fan is used in which the heat of the heat generating element is moved to the heat radiating fin portion by a heat pipe, cold air is sent to the heat radiating fin portion by a fan, and the heat of the heat generating element is released to the outside of the casing.

  A centrifugal fan is placed in a cavity formed by the top, bottom, and wall surfaces, and heat radiating fins are placed facing the centrifugal fan. The wind generated by the centrifugal fan passes through the individual heat radiating fins to enhance the heat radiation effect. be able to. Furthermore, a heat sink is thinned by arrange | positioning a centrifugal fan in the cavity part formed by an upper surface, a bottom face, and a wall surface, and arrange | positioning a radiation fin facing a centrifugal fan.

  FIG. 5 is a schematic sectional view illustrating a conventional heat sink with a centrifugal fan. As shown in FIG. 5, a centrifugal fan 102 is disposed in a cavity formed by the top surface, the bottom surface, and the side wall surface. Two radiating fin portions 107 and 108 that face the centrifugal fan and whose major axis directions are orthogonal to each other are arranged.

One end of the heat pipe is thermally connected to the heat generating element (not shown), and the other end of the heat pipe is thermally connected along the long axis direction of the radiation fin. The heat of the heat generating element is moved to the heat radiating fin portion by the heat pipe, and the heat moved to the heat radiating fin portion is released to the outside of the housing by the wind from the centrifugal fan and radiated.
JP-A-9-172113

  As shown in FIG. 5, two radiating fin portions (that is, the first radiating fin portion 107 and the second radiating fin portion 108) facing the centrifugal fan are arranged so that their major axes are at right angles. In this state, when the centrifugal fan is rotated, the main force of the wind generated by the rotation of the centrifugal fan passes through the individual radiating fins in the direction of the arrow 101 through the first radiating fins 107, and The individual radiating fins are passed in the direction of arrow 105. However, a wind flow in the direction indicated by the arrow 103, which is opposite to the wind flow described above, occurs in the portion of the first heat radiation fin portion in the vicinity where the first heat radiation fin portion and the second heat radiation fin portion are in contact with each other.

  The wind of the flow indicated by the arrow 103 passes through the first heat dissipating part, and heat of a heat pipe (not shown) is transmitted to raise the temperature, and the warmed wind flows backward into the centrifugal fan, and the centrifugal fan is accommodated. The air in the cavity is heated and flows through the second radiating fin as indicated by an arrow 104. As a result, there is a problem that the heat radiation effect of the heat radiating fin portion is deteriorated and the function of the heat sink is lowered.

  Accordingly, an object of the present invention is to provide a thin heat sink with a centrifugal fan that suppresses the flow of wind in the reverse direction passing through the heat dissipating fin portion facing the centrifugal fan, increases the heat dissipating efficiency of the heat dissipating fin portion, and is thin. There is.

  The inventor conducted extensive research to solve the conventional problems. As a result, for example, when a rectangular plate-shaped rectifying piece is disposed in a right-angled portion formed by two radiating fin portions whose major axis directions are orthogonal to each other, the wind generated by the centrifugal fan passes through the radiating fins. It has been found that the flow of wind flowing in the opposite direction is suppressed, the wind flows smoothly through the two radiating fin portions, and the heat radiation efficiency is increased.

  Furthermore, when the rectifying pieces are arranged so as to divide the angle formed by the two radiating fin portions perpendicular to the long axis direction into two equal parts when the rectifying pieces are attached, they pass between the individual radiating fins. It has been found that the amount of wind can be flattened.

According to a first aspect of the present invention , there is provided a centrifugal fan that blows air taken in from an air intake port in a tangential direction of a rotation circle of the fan, and a heat pipe in which one end portion is thermally connected to a heating element. Two heat dissipating fins arranged in parallel with a plurality of heat dissipating fins that are thermally connected to the heat dissipating part, and arranged so that the long axis direction intersects with the tips of the respective one end parts being brought close to each other The air blown from the centrifugal fan passes through the plurality of heat dissipating fins and is disposed near the adjacent end portions of the two heat dissipating fin portions, Arranged in the middle of the reverse flow of wind that is sucked from the vicinity of one of the adjacent ends of the radiating fin and discharged from the other radiating fin, and blocks the flow of the reverse directional wind heating element having a rectifying piece, the A heat sink with centrifugal fan for heat dissipation.

According to a second aspect of the present invention , there is provided the centrifugal fan formed by a top surface portion and a bottom surface portion each having an air intake, and a side wall portion having an opening in which the two heat radiating fin portions are disposed. A heat sink with a centrifugal fan for radiating heat generating elements , comprising a hollow portion to be accommodated, wherein the rectifying piece is vertically attached between the upper surface portion and the bottom surface portion.

According to a third aspect of the present invention , the rectifying piece is made of a rectangular plate-like material, and the upper surface portion of the plate-like material is attached to the upper surface portion, and the lower surface portion of the plate-like material is attached to the bottom surface portion. Thus, the heat sink is a heat sink with a centrifugal fan for radiating heat generating elements , which blocks the flow of wind.

A fourth aspect of the invention, the rectifying element crossing angle formed by said two of the heat dissipation fin portion is longitudinally orthogonal proximate the ends to divide into two are arranged, heating It is a heat sink with a centrifugal fan for element heat dissipation .

A fifth aspect of the invention, an end portion of the rectifying piece, length proximate the ends shaft is disposed in contact with the corner portion formed by two of the heat radiating fin portion orthogonal, heating elements heat dissipation is a heat sink with centrifugal fan of use.

A sixth aspect of the invention, one end of the heat pipe is thermally connected to the heating element, the other end of the heat pipe to the heat dissipating fin portion is thermally connected, the heat generating element radiator is a heat sink with centrifugal fan of use.

In the seventh aspect of the present invention, another radiating fin portion is thermally connected to a surface opposite to the surface thermally connected to the radiating fin portion of the other end of the heat pipe. It is a heat sink with a centrifugal fan for radiating heat generating elements .

  According to the heat sink with a centrifugal fan of the present invention, the centrifugal fan is attached to the cavity formed by the top surface, the bottom surface, and the side wall surface, and the two heat dissipating fin portions are orthogonal to each other in the major axis direction facing the centrifugal fan. The rectangular plate-shaped rectifying piece is disposed at a right angle portion formed by two radiating fin portions, so that the wind generated by the centrifugal fan flows in a direction opposite to the direction passing through the radiating fins. Thus, the flow of air smoothly flows through the individual heat radiation fins of the two heat radiation fin portions, so that the heat radiation efficiency can be improved and the noise can be reduced.

A heat sink with a centrifugal fan of the present invention will be described with reference to the drawings.
One aspect of the heat sink with a centrifugal fan according to the present invention is arranged such that a centrifugal fan that takes in air from an air intake port and blows air in a predetermined direction and one end of each are close to each other and the major axis direction intersects. The wind from the centrifugal fan that passes through either one of the two radiating fins and the two radiating fins in which a plurality of radiating fins are arranged in parallel, through which the wind from the centrifugal fan passes And a heat sink with a centrifugal fan provided with a rectifying piece that blocks the flow of wind in the opposite direction.
The height of the rectifying piece may be smaller than the height of the heat radiating fin portion or the heat radiating fin, but is desirably set to the same height as the heat radiating fin portion or the heat radiating fin.

  FIG. 1 is a schematic diagram for explaining a centrifugal fan attached to the upper surface of a heat sink with a centrifugal fan of the present invention. That is, FIG. 1 is a view of the centrifugal fan attached to the upper surface 3 of the heat sink as viewed from the back side.

  As shown in FIG. 1, a centrifugal fan is rotatably attached to the upper surface 3. The heat sink with a centrifugal fan of the present invention to which the centrifugal fan is attached includes a hollow portion formed by superposing a cover having a top surface 3, a body portion integrally formed with a bottom surface and a side wall surface. A centrifugal fan is accommodated in the cavity. There is an opening for the heat radiating fin part in a part of the wall surface part, and the heat radiating fin part is attached facing the centrifugal fan so that each major axis direction is orthogonal to the opening. Air intake ports of the centrifugal fan are formed on the upper surface and the bottom surface, respectively.

  The two radiating fin portions (that is, the first radiating fin portion 7-1 and the second radiating fin portion 7-2) include, for example, a plurality of generally U-shaped radiating fins each including a top surface portion, a vertical surface portion, and a bottom surface portion in parallel. It is arranged and formed. A passage having a rectangular cross section is formed from the upper surface portion, the bottom surface portion, the vertical surface portion, and the adjacent vertical surface portion by the heat radiation fins arranged in parallel. The wind generated by the centrifugal fan passes through the passage described above.

  FIG. 2 is a view for explaining the main body portion in which the bottom surface and the side wall surface of the heat sink with centrifugal fan of the present invention are integrally formed. The centrifugal fan 2 attached to the upper surface 3 described with reference to FIG. 1 is accommodated in the cavity of the main body shown in FIG. That is, the upper surface 3 is attached to the main body of the heat sink so that the centrifugal fan 2 faces the air intake port 8.

Thus, in the heat sink with a centrifugal fan of the present invention, the centrifugal fan 2 is housed in the cavity formed by the upper surface portion 3 and the bottom surface portion 5 and the side wall portion 6 each having the air intake port 8. The two radiating fin portions 7-1 and 7-2 are provided in the opening of the side wall portion 6 so that the major axis directions thereof are orthogonal to each other, and the rectifying piece 4 is composed of the first radiating fin portion and the second radiating fin portion. Is attached to the bottom of the right-angled part formed by
In addition, in the aspect shown in FIG. 1 and 2, although the rectifying piece 4 is attached to the bottom face, it is not limited to this, A rectifying piece may be attached to an upper surface part.

  The rectifying piece 4 is formed of a substantially rectangular plate-like object, and is formed by a first radiating fin portion 7-1 and a second radiating fin portion 7-2 that are arranged so that the major axis directions thereof are orthogonal to each other. It is arranged perpendicular to the right angle part. The height of the plate-like object is, for example, approximately equal to the thickness of the heat sink, and is arranged so that the upper and lower sides are in contact with the upper surface portion and the main body portion, respectively, when the upper surface portion and the main body portion are combined. The height of the plate-like object may be half of the thickness of the heat sink. The angle formed between the height and length of the plate-like object and the major axis direction of the heat dissipating fin part in the horizontal plane is determined by the air flow flowing in the opposite direction to the air flow caused by the centrifugal fan in the first heat dissipating fin part. It is set so that the flow of

  In other words, the air from the centrifugal fan is generally rectified between the heat radiating fins of the first and second heat radiating fins by the rectifying piece 4 arranged at a predetermined angle and having a predetermined length. The amount of air flowing through the entire radiating fin is flattened.

  FIG. 3 is a schematic perspective view showing a centrifugal heat sink according to the present invention. That is, the upper surface portion provided with the centrifugal fan shown in FIG. 1 is arranged with two radiating fin portions perpendicular to each other in the major axis direction shown in FIG. It is the perspective view which looked at the heat sink formed by incorporating in the main body part from the front side. As shown in FIG. 3, a centrifugal fan is housed and fixed in a cavity formed by an upper surface portion, a side wall portion, and a bottom surface portion. Similar to the bottom surface, an air intake 8 is also formed on the top surface. A centrifugal fan is visible through the air intake.

  The direction of rotation of the centrifugal fan is indicated by an arrow in the figure. The two radiating fin portions 7-1 and 7-2 are arranged at right angles to each other and are provided facing the centrifugal fan. A substantially rectangular plate-like object is disposed at a right-angled portion formed by the contact of the first radiating fin portion 7-1 and the second radiating fin portion. The plate-like object as the rectifying piece is disposed so as to be in contact with the combined upper surface portion and the bottom surface portion of the main body portion. The wind generated by the centrifugal fan passes through the individual heat radiation fins of the first heat radiation fin portion 7-1 and the second heat radiation fin portion 7-2. In that case, the generation | occurrence | production of the wind which flows to a reverse direction to the wind which passes each radiation fin part is suppressed by the plate-shaped object as a baffle piece.

  Although not shown, the other end of the heat pipe 9 whose one end is thermally connected to the heat generating element is thermally connected to the radiating fin. A heat pipe may be connected to each of the two radiating fin portions. The other end of the heat pipe is preferably arranged along the major axis direction of each radiating fin.

  Thus, by disposing the heat dissipating fin portion relative to the centrifugal fan and disposing the generally rectangular plate-shaped object that is the rectifying piece as described above, the flow of the wind in the direction opposite to the wind passing through the heat dissipating fin. Is effectively suppressed, the amount of wind passing through each radiating fin portion is flattened with respect to the major axis direction of the radiating fin portion, heat radiating efficiency is improved, and noise is reduced.

  FIG. 4 is a schematic perspective view showing a centrifugal heat sink according to the present invention. That is, the upper surface portion provided with the centrifugal fan shown in FIG. 1 is arranged on the two radiating fin portions perpendicular to each other in the major axis direction shown in FIG. It is the perspective view which looked at the heat sink formed and assembled in the main body part made from the back side. As shown in FIG. 4, the centrifugal fan 2 is housed and fixed in a cavity formed by the upper surface portion, the side wall portion, and the bottom surface portion. Two heat radiating fin portions are arranged at right angles relative to the centrifugal fan. As with the top surface, an air intake 8 is also formed in the bottom surface. The centrifugal fan 2 is visible through the air intake.

  The direction of rotation of the centrifugal fan is indicated by an arrow in the figure. The first radiating fin portion 7-1 and the second radiating fin portion 7-2 are arranged so that the major axis directions thereof are orthogonal to each other and face the centrifugal fan 2. A rectangular plate-like material as a rectifying piece is provided in contact with the upper surface and the bottom surface at a right angle portion formed by the first radiating fin portion 7-1 and the second radiating fin portion 7-1.

  As shown in the figure, the other end of the heat pipe 9 whose one end is thermally connected to the heating element (not shown) is a second radiating fin portion 7-2, a first radiating fin portion 7- The thermal connection is sequentially performed along the long axis direction of 1.

  In FIG. 4, two heat radiating fins are thermally connected to one heat pipe. However, two heat pipes are arranged in parallel with a predetermined gap, and each heat pipe separately heats the heat radiating fin. May be connected to each other. In this way, by disposing the two radiating fin portions relative to the centrifugal fan and arranging the plate-like object that is the rectifying piece as described above, the centrifugal fan flows in the opposite direction to the wind passing through the radiating fin portion. The generation of wind is suppressed, and the air volume is generally flattened in the long axis direction of the radiating fin portion, so that the heat radiation efficiency is improved and noise is reduced.

  As described above, according to the present invention, the centrifugal fan is attached to the cavity formed by the top surface, the bottom surface, and the side wall surface, and the two radiating fin portions are orthogonal to each other in the major axis direction facing the centrifugal fan. The rectangular plate-shaped rectifying piece is disposed at a right angle portion formed by two radiating fin portions, so that the wind generated by the centrifugal fan flows in a direction opposite to the direction passing through the radiating fins. Thus, a heat sink with a centrifugal fan can be provided in which the air flows smoothly through the individual heat radiation fins of the two heat radiation fin portions and the heat radiation efficiency can be improved.

FIG. 1 is a schematic diagram for explaining a centrifugal fan attached to the upper surface of a heat sink with a centrifugal fan of the present invention. FIG. 2 is a view for explaining the main body portion in which the bottom surface and the side wall surface of the heat sink with centrifugal fan of the present invention are integrally formed. FIG. 3 shows that the upper surface portion provided with the centrifugal fan shown in FIG. 1 has two radiating fin portions perpendicular to each other in the major axis direction shown in FIG. It is the perspective view which looked at the heat sink formed incorporating in the arrange | positioned main-body part from the front side. FIG. 4 shows a rectifying piece formed on the upper surface portion provided with the centrifugal fan shown in FIG. 1 at two radiating fin portions perpendicular to each other in the major axis direction shown in FIG. 2 and a right angle portion formed by the radiating fin portions. It is the perspective view which looked at the heat sink formed by incorporating in the main-body part by which it was arrange | positioned from the back side. FIG. 5 is a schematic sectional view illustrating a conventional heat sink with a centrifugal fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat sink with a centrifugal fan 2 Centrifugal fan 3 Upper surface part 4 Rectification piece 5 Bottom face part 6 Side wall surface 7 Radiation fin part 8 Air intake 9 Heat pipe 100 Conventional heat sinks 101 and 105 with a centrifugal fan Centrifugal fan wind flow 102 Centrifugal fan 103 Wind flow in reverse direction 107 First radiating fin portion 108 Second radiating fin portion

Claims (7)

A centrifugal fan that blows air taken in from the air intake in the direction tangential to the rotation circle of the fan;
Two heat dissipating fins in which a plurality of heat dissipating fins that are thermally connected to a part of a heat pipe whose one end is thermally connected to a heat generating element are arranged in parallel, Two radiating fin portions that are arranged so that the major axis directions thereof cross each other and the air blown from the centrifugal fan passes through the plurality of radiating fins,
Arranged near the adjacent end portions of the two radiating fin portions, sucked from the vicinity of one adjacent end portion of the radiating fin portion, and discharged in the opposite direction from the other radiating fin portion A rectifying piece disposed in the middle of the wind flow and blocking the wind flow in the opposite direction;
Heat sink with heat sink with centrifugal fan for heat dissipation . A cavity portion for accommodating the centrifugal fan, each formed by a top surface portion and a bottom surface portion each having an air intake, and a side wall portion having an opening in which the two heat dissipating fin portions are disposed; The heat sink with a centrifugal fan for radiating heat generating elements according to claim 1, wherein a rectifying piece is vertically attached between the upper surface portion and the bottom surface portion. The rectifying piece is made of a rectangular plate-like material, and the upper surface portion of the plate-like material is attached to the upper surface portion, and the lower surface portion of the plate-like material is attached to the bottom surface portion, thereby blocking the flow of wind. A heat sink with a centrifugal fan for radiating heat generating elements according to claim 2. The heating element radiating element according to claim 3, wherein the rectifying piece is arranged so as to divide an intersecting angle formed by the two radiating fin portions whose end portions are close to each other and whose major axis is orthogonal to each other. Heat sink with centrifugal fan. 5. The heat-generating element heat-dissipating centrifuge according to claim 4, wherein an end portion of the rectifying piece is disposed in contact with a corner portion formed by the two heat-radiating fin portions whose end portions are close to each other and whose major axis is perpendicular. Heat sink with fan. 6. The heat generation according to claim 1, wherein one end portion of a heat pipe is thermally connected to the heat generating element, and the other end portion of the heat pipe is thermally connected to the radiating fin portion. A heat sink with a centrifugal fan as described for element heat dissipation . The heating element heat radiation according to claim 6, wherein another radiation fin portion is thermally connected to a surface opposite to a surface thermally connected to the radiation fin portion of the other end portion of the heat pipe. the heat sink with a centrifugal fan of use.

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