JP2006279004A - Heat sink with heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink with a heat pipe restrained in height, low in noise, compact in form and high in radiating efficiency even in the case that it is used for an electronic apparatus in which a height is limited such as a personal computer and a game device. <P>SOLUTION: A heat sink with a heat pipe is provided with one or a plurality of heat receiving blocks that are thermally connected with one or a plurality of heating elements requiring cooling; a plurality of heat pipes that are thermally connected with the heat receiving blocks and transporting heat from the heat receiving blocks; radiating fins comprising a plurality of annular sheet-like fins that are thermally connected with the heat pipes inserted through and juxtaposed to form a cavity inside; and a centrifugal fan arranged in the cavity in such a manner that the rotation axis of the centrifugal fan is roughly perpendicular to the annular sheet-like fins, to take in air from the upward and/or downward directions of the radiating fin parts and to exhaust the air toward the side of the radiating fins. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat pipe through which a plurality of radiating fins are inserted and a heat sink provided with a centrifugal fan, and more particularly, to a heat sink with a heat pipe that has a reduced height and is compact and has high heat dissipation efficiency.

  There is a need for a high-performance heat sink with excellent heat dissipation efficiency due to an increase in heat generation amount and heat generation density of CPUs and elements. Furthermore, electronic devices such as personal computers and game machines are required to have a heat sink with a limited height, a compact size, low noise, and high heat dissipation efficiency. Conventionally, heat sinks made of extruded aluminum material, which are inexpensive to manufacture, have been used. The heat sink made of extruded material is easy to manufacture because the heat receiving block and the heat radiating fins are integrally formed. However, the pitch of the heat radiating fins is limited due to manufacturing restrictions, and the fins can be formed at a fine pitch. Technically difficult.

  Furthermore, it is difficult to cope with an increase in the amount of heat generated only by the combination of the heat receiving block and the heat radiating fins, and a heat sink combined with a heat pipe has been used. Among them, a heat sink of a type in which a plurality of thin plate-like heat radiation fins are inserted into a plurality of vertically arranged heat pipes having one end attached to a heat receiving block has been widely used. By using the heat pipe in this way, the heat radiation area and fin efficiency are improved, and heat radiation with a high calorific value is possible.

  A space serving as a flow path for the working fluid is provided inside the heat pipe, and the working fluid accommodated in the space undergoes a phase change or movement such as evaporation or condensation, thereby transferring heat. That is, on the heat absorption side of the heat pipe, the working fluid evaporates due to the heat generated by the parts to be cooled that are conducted through the material of the container constituting the heat pipe, and the vapor moves to the heat radiation side of the heat pipe. To do. On the heat radiating side, the working fluid vapor is cooled and returned to the liquid phase again. The working fluid that has returned to the liquid phase in this way moves (refluxs) again to the heat absorption side. Heat is transferred by such phase transformation and movement of the working fluid.

Normally, in the case of a forced-cooling heatsink that uses a heatsink that is connected to the heat-receiving block and has a number of heat-dissipating fins inserted into a plurality of heat pipes arranged vertically, a fan is attached to the side of the heat-dissipating fin. Attach and move the heat of the component to be cooled to the heat radiating fin by the heat pipe and forcibly cool it by the cooling fan. Although not shown in Patent Document 1, an actual configuration including a fan is generally as shown in FIG. 9, for example. FIG. 9A is a left side view thereof, and FIG. 9B is a front view thereof.
JP-A-11-351769

  However, in the conventional heat sink including the cooling fan described above, the area of the front surface of the fin is comparable to the area of the axial fan, and the height of the fan tends to be high. When such heat sinks are used in electronic devices where the height is limited, such as personal computers and game machines, instead of reducing the height of the heat dissipation fins, the heat sink becomes a horizontally long heat sink, In order to cool it, many small-diameter fans are arranged, and the number of fans to be combined increases. At the same time, there is a problem that the noise becomes high, the exhaust port of the electronic device becomes large, and the housing becomes large in combination with securing the installation place of various terminals.

  Accordingly, an object of the present invention is to provide a heat pipe with a heat pipe that suppresses the height, is low in noise, is compact, and has high heat dissipation efficiency even when used in electronic devices where the height is limited, such as personal computers and game machines. There is to do.

  The inventor has conducted research in order to solve the conventional problems described above. As a result, a centrifugal fan is installed in the cavity formed inside the annular heat dissipating fins arranged in a plurality of layers, and the heat of the part to be cooled is vertically inserted so that the heat dissipating fins are inserted from the heat receiving block. Heat is transferred by the heat pipe, air is taken in from the upper and lower parts by the centrifugal fan, and blown to the heat radiating fins to reduce the height, achieve low noise and compact heat sink with heat pipe with high heat dissipation efficiency. It has been found.

The first aspect of the heat pipe with heat pipe of the present invention includes one or a plurality of heat receiving blocks that are thermally connected to one or a plurality of heating elements that require cooling,
A plurality of heat pipes thermally connected to the heat receiving block and transporting heat from the heat receiving block;
The heat pipe is inserted through and thermally connected, and a heat dissipating fin portion composed of a plurality of annular thin plate-like fins arranged in parallel to form a hollow portion therein, and
Arranged in the cavity so that the rotation axis of the centrifugal fan is substantially perpendicular to the annular thin plate-like fin, air is taken in from above and / or below the radiating fin, and to the side of the radiating fin. It is a heat sink with a heat pipe provided with the centrifugal fan which discharges | emits air toward.

  According to a second aspect of the heat pipe with heat pipe of the present invention, the plurality of heat pipes include intersections that intersect at a portion where the plurality of heat pipes are thermally connected to the heat receiving block, and each of the heat pipes is at the intersection. Is a heat sink with a heat pipe in which the overall height of a plurality of intersecting heat pipes is substantially the same as the height of the non-intersecting portions of the individual heat pipes.

  According to a third aspect of the heat sink with a heat pipe of the present invention, a cover for covering the periphery of the radiating fin portion is further provided, and an air flow generated by the centrifugal fan is discharged to a part of the cover to the outside. It is a heat sink with a heat pipe provided with the hole part.

  A fourth aspect of the heat sink with heat pipe of the present invention is a heat sink with heat pipe, wherein the cover is formed by extending and bending a part of each of the plurality of thin plate fins arranged in parallel. is there.

  According to a fifth aspect of the heat sink with a heat pipe of the present invention, the cover is formed with a duct for discharging an air flow that has passed through the thin plate fins in the vicinity of an outer end portion of the thin plate fins. Is a heat sink with a heat pipe whose cross-sectional area gradually increases toward the hole for discharging the air flow to the outside.

  In a sixth aspect of the heat sink with a heat pipe according to the present invention, the depth of the radiating fin portion viewed from the centrifugal fan side is gradually enlarged toward the hole portion for discharging the airflow to the outside. It is a heat sink with a heat pipe.

  7th aspect of the heat sink with a heat pipe of this invention is a heat sink with a heat pipe with which the arrangement density of these heat pipes is high toward the hole part for discharging | emitting the said air flow outside. .

  According to an eighth aspect of the heat pipe with heat pipe of the present invention, when the heat receiving block is provided with another heat radiating fin thermally connected thereto, and the centrifugal fan takes in air from one of the heat radiating fin portions. A heat sink with a heat pipe that is partially radiated by the other radiating fin.

The ninth aspect of the heat pipe-attached heat sink of the present invention includes one or more heat receiving blocks that are thermally connected to one or more heating elements that require cooling,
A plurality of heat pipes that are thermally connected to the heat receiving block and transport heat from the heat receiving block, the plurality of heat pipes including an intersecting portion that intersects at a portion that is thermally connected to the heat receiving block; At the intersection, the individual heat pipes are flattened, and the overall height of the plurality of intersecting heat pipes is substantially the same as the height of the non-intersecting portions of the individual heat pipes;
A fin portion composed of a plurality of thin plate fins through which the heat pipe is inserted and thermally connected;
It is a heat pipe heat sink with a fan.

  According to the heat sink with a heat pipe of the present invention, a plurality of annular thin plate fins arranged in layers are inserted through, for example, a U-shaped round heat pipe partially connected to the heat receiving block, and formed inside the annular thin plate fin. Since the centrifugal fan is placed in the cavity, the area of the fin is widened while keeping the height and width occupied by the fin small, and the heat of the part to be cooled is efficiently transferred to the radiating fin by the heat pipe. Heat can be dissipated by the centrifugal fan. Therefore, it is possible to provide a heat sink with a heat pipe that suppresses the height, is low in noise, is compact, and has high heat dissipation efficiency. Further, by providing a cover on the outer periphery of the fin, directivity is provided in the air discharge direction, and direct discharge to the outside of the housing can suppress an increase in air temperature in the housing due to heat generated by the heating element.

A heat sink with a heat pipe of the present invention will be described with reference to the drawings.
One aspect of the heat sink with a heat pipe of the present invention includes one or more heat receiving blocks that are thermally connected to one or more heating elements that require cooling;
A plurality of heat pipes thermally connected to the heat receiving block and transporting heat from the heat receiving block;
The heat pipe is inserted through and thermally connected, and a heat dissipating fin portion composed of a plurality of annular thin plate-like fins arranged in parallel to form a hollow portion therein, and
Arranged in the cavity so that the rotation axis of the centrifugal fan is substantially perpendicular to the annular thin plate-like fin, air is taken in from above and / or below the radiating fin, and to the side of the radiating fin. It is a heat sink with a heat pipe provided with the centrifugal fan which discharges | emits air toward.

  FIG. 1 is a view showing one embodiment of a heat sink with a heat pipe according to the present invention. FIG. 1A is a plan view thereof, and FIG. 1B is a side view thereof. As shown in FIGS. 1A and 1B, a heat sink 1 with a heat pipe includes a heat receiving block 2 having a heat receiving surface that is thermally connected to a heating element that requires cooling, and one heat receiving block 2. A plurality of, for example, round heat pipes 3, 4, and 5 that are thermally connected to each other and move heat from the heat receiving block, and a plurality of annular thin plates that are arranged in parallel in the vertical direction to form a cavity therein A heat dissipating fin portion 6 made of fins and a centrifugal fan 8 that is disposed in the hollow portion, takes in air from above and below the heat dissipating fin portion, and discharges air toward the side of the heat dissipating fin portion.

  That is, as shown in FIG. 1A, the annular thin plate fin 6 has a substantially circular inside and a predetermined shape on the outside. The annular thin plate fins 6 having the same shape are arranged in parallel in the vertical direction to form the cavity 9. The centrifugal fan 8 is arranged in the cavity formed in this way so that the rotation axis is perpendicular to the annular thin plate fin. The size of the hollow portion is such that the impeller 7 of the centrifugal fan 8 can rotate around the rotation axis. That is, the inner end portion of the annular thin plate fin and the outer end portion of the impeller of the centrifugal fan are set so that the heat transferred to the radiating fin is radiated most efficiently. In the centrifugal fan, as shown in FIG. 1B, wind enters the impeller of the centrifugal fan vertically from the upper and lower parts (10, 11), and the wind is discharged toward the heat radiation fins at 360 degrees parallel to the impeller. (12).

  In this embodiment, the heat pipes 3, 4, and 5 are combined with a U-shaped round heat pipe, an L-shaped round heat pipe, and the like, and a part thereof is thermally connected to the heat receiving block 2. The heat pipes 3, 4, and 5 extend in the horizontal direction from the heat receiving block 2, then curve and extend in the vertical direction. As described above, the annular thin plate fin is inserted into and thermally connected to the vertically extending heat pipe portion.

  As described above, in the heat sink with heat pipe of the present invention, the centrifugal fan is disposed inside the heat radiating fin portion, and the heat transferred from the heat receiving block to the heat radiating fin portion by the heat pipe is dissipated to the entire circumference by the centrifugal fan. To do. In other words, taking advantage of the characteristics of a centrifugal fan that winds vertically into the impeller and discharges in the direction of 360 degrees in parallel with the impeller, the radiating fin part with a wide opening and a reduced height is formed into a circle shape. The heat receiving block (heat source) and the radiating fin portion are thermally connected by a heat pipe in order to efficiently diffuse heat to the circumferential radiating fin.

  Therefore, the combination of the annular thin plate fin and the centrifugal fan can widen the opening and reduce the depth, thereby improving the heat dissipation efficiency per unit volume.

  In the aspect mentioned above, the heat of a radiation fin is discharge | released over the perimeter. In one aspect of the heat pipe-attached heat sink of the present invention, there may be provided means for regulating the heat of the radiating fins in a specific direction.

  FIG. 2 is a diagram showing another embodiment of a heat sink with a heat pipe according to the present invention. FIG. 2A is a plan view thereof, and FIG. 2B is a side view thereof. In the embodiment shown in FIG. 2, a cover is provided as means for regulating the heat of the radiating fins in a specific direction. That is, as shown in FIG. 2 (a), similar to the above-described embodiment, the annular thin plate fins 6 having the same shape and having a substantially circular inside and a predetermined shape on the outside are arranged in parallel in the vertical direction. The hollow portion 9 is formed, and the centrifugal fan 8 is arranged in the hollow portion thus formed so that the rotation axis is perpendicular to the annular thin plate fin. In order to efficiently diffuse heat to the radiating fin portion, also in this aspect, the heat receiving block and the radiating fin portion are thermally connected by a heat pipe.

  Furthermore, the cover 13 is provided so that the outer side of the radiation fin part inserted in the vertical part of the heat pipe may be covered. A part of the cover 13 is provided with a hole for discharging the air flow generated by the centrifugal fan to the outside. The cover 13 covers the upper and lower portions and the outer peripheral portion of the radiating fin portion except for the hollow portion 9 formed inside the plurality of annular thin plate fins 6 arranged in a stacked manner. Note that the cover can be appropriately set to obtain a desired effect. For example, the upper and lower portions of the cover may be provided so as to cover a part of the outer peripheral portion of the centrifugal fan 8. As shown in FIG. 2B, wind enters the impeller 7 of the centrifugal fan 8 vertically from the upper and lower parts, and the wind flows parallel to the impeller 7 toward the radiation fins at 360 degrees. The direction of the wind flowing along the radiation fins is regulated and guided by the cover 13 and is discharged out of the heat sink through the hole as indicated by an arrow 32 in FIG.

As a means for restricting the heat of the radiating fins in a specific direction, the cover may be formed by processing an annular thin plate fin.
FIG. 3 is a diagram showing another embodiment of the heat sink with a heat pipe according to the present invention. FIG. 3A is a plan view thereof, and FIG. 3B is a side view thereof. FIG. 3C is a perspective view showing the processed annular thin plate fin. In the embodiment shown in FIG. 3, as means for regulating the heat of the radiating fins in a specific direction, a cover is provided, and the cover extends and bends a part of each of the plurality of thin plate-like fins arranged in parallel. Is formed.

  That is, as shown in FIG. 3 (a), similar to the above-described embodiment, annular thin plate fins 6 having the same shape, the inside being generally circular and the outside having a predetermined shape, are arranged in parallel in the vertical direction. The hollow portion 9 is formed, and the centrifugal fan 8 is arranged in the hollow portion thus formed so that the rotation axis is perpendicular to the annular thin plate fin. In order to efficiently diffuse heat to the radiating fin portion, the heat receiving block 2 and the radiating fin portion 6 are also thermally connected by the heat pipes 3, 4, and 5 in this aspect.

  As shown in FIG. 3 (c), each annular thin plate fin 6 in which a space 9 having a substantially circular inside is formed has its outer peripheral portion bent in one direction to form a vertical portion 61. The vertical portion 61 formed in this manner contacts the upper surface 60 of the adjacent annular thin plate fin, and closes the end portion of the annular thin plate fin. As a result, as shown in FIG. 3 (b), the outer end portion of the radiating fin portion as a whole becomes substantially the same shape as when a cover is provided.

  In this embodiment, wind enters the impeller 7 of the centrifugal fan 8 vertically from above and below, and the wind flows parallel to the impeller 7 toward the heat radiation fins at 360 degrees. In this way, the wind that flows along the radiation fins is guided by the flow being restricted by the vertical portion formed at the outer end, and passes through the hole as shown by the arrow 32 in FIG. Discharged outside.

Further, a cover may be provided as a means for regulating the heat of the radiating fin in a specific direction, and a duct may be formed on the outer peripheral portion of the annular thin plate fin.
FIG. 4 is a view showing another embodiment of a heat sink with a heat pipe according to the present invention. In the heat sink with a heat pipe of this aspect, the cover described above forms a duct for discharging the air flow that has passed through the thin plate fin in the vicinity of the outer end portion of the thin plate fin, and the duct sends the air flow to the outside. The cross-sectional area gradually increases toward the hole for discharging.

  As shown in FIG. 4, similar to the above-described embodiment, in this embodiment, annular thin plate fins 6 having the same shape, the inside of which is generally circular and the outside of which is generally circular, are arranged in parallel in the vertical direction and are hollow. The centrifugal fan 8 is arranged so that the rotating shaft is perpendicular to the annular thin plate fin in the cavity portion thus formed. In order to efficiently diffuse heat to the radiating fin portion 6, also in this aspect, the heat receiving block (not shown) and the radiating fin portion 6 are thermally connected by the heat pipes 3, 4, and 5.

  A cover 13 is provided so as to cover the outside of the radiating fin portion inserted through the vertical portion of the heat pipe. A part of the cover 13 is provided with a hole for discharging the air flow generated by the centrifugal fan to the outside. The cover 13 is provided so as to cover a part of the outer peripheral portion of the centrifugal fan 8 arranged in the cavity formed inside the plurality of annular thin plate fins 6 arranged in a stacked manner. As shown in FIG. 4, a duct 15 is formed between the outer peripheral portion of the annular thin plate fin and the inner peripheral portion of the cover. Although the cross-sectional area of the duct may be constant, in this aspect, the cross-sectional area gradually increases toward the hole for discharging the airflow to the outside. That is, the duct has a different cross-sectional area on the side 15-2 of the hole of the cover and on the opposite side 15-1. That is, the cross-sectional area of the duct is set to be small on the opposite side of the hole as shown by A, and the cross-sectional area of the duct is set to be large as shown by B near the hole.

  In this embodiment, wind enters the impeller 7 of the centrifugal fan 8 vertically from above and below, and the wind flows parallel to the impeller 7 toward the heat radiation fins at 360 degrees. The wind that flows along the radiating fins as described above passes along the outer peripheral portion of the annular thin plate fin through the duct formed in the vicinity of the outer end portion of the annular thin plate fin and having a cross-sectional area gradually increasing toward the hole. As shown by the arrow 32 in FIG. 4, it is discharged out of the heat sink through the hole. By forming the duct in this manner, the air that has passed through the heat dissipating fins and is warmed can be quickly discharged out of the heat sink, and the heat dissipating efficiency can be improved.

Next, more efficient heat radiation of the heat transferred from the heat receiving block to the heat radiation fin by the heat pipe will be described.
FIG. 5 is a diagram showing another embodiment of a heat sink with a heat pipe according to the present invention. FIG. 5A is a plan view thereof, and FIG. 5B is a side view thereof. In the heat sink with a heat pipe of this aspect, the depth of the radiating fin portion viewed from the centrifugal fan side described above gradually expands toward the hole portion for discharging the airflow to the outside. That is, the shape of the annular thin plate fin is changed.

  As shown in FIG. 5, similar to the above-described embodiment, in this embodiment, annular thin plate fins 6 having the same shape, the inside of which is generally circular and the outside of which is generally circular, are arranged in parallel in the vertical direction and are hollow. The centrifugal fan 8 is arranged so that the rotating shaft is perpendicular to the annular thin plate fin in the cavity portion thus formed. In order to efficiently diffuse heat to the radiating fin portion 6, also in this embodiment, the heat receiving block 2 and the radiating fin portion 6 are connected to the heat pipes 3, 4, 5 (two U-shaped round heat pipes and one L-type heat pipe).

  A cover 13 is provided so as to cover the outside of the radiating fin portion inserted through the vertical portion of the heat pipe. A part of the cover 13 is provided with a hole for discharging the air flow generated by the centrifugal fan to the outside. The cover 13 is provided so as to cover a part of the outer peripheral portion of the centrifugal fan 8 arranged in the cavity formed inside the plurality of annular thin plate fins 6 arranged in a stacked manner.

  As shown in FIG. 5 (a), the annular thin plate fin 6 has a substantially circular inside and an asymmetric shape on the outside. That is, when viewed from the centrifugal fan side, the depth of the annular thin plate fin portion is small on the side 16-1 opposite to the hole portion for discharging the air flow to the outside, and gradually increases, and in the vicinity of the hole portion 6-2. It is getting bigger.

  In this embodiment, wind enters the impeller 7 of the centrifugal fan 8 vertically from above and below, and the wind flows parallel to the impeller 7 toward the heat radiation fins at 360 degrees. The wind that has flowed along the heat radiating fins in this way is discharged out of the heat sink through the flow hole as shown by an arrow 32 in FIG. 5 along the hole for discharging the air flow to the outside. . By forming the annular thin plate fins in this manner, heat can be widely diffused to the hole side for discharging the air flow to the outside, and the heat radiation efficiency can be improved.

Furthermore, changing the arrangement density of the heat pipes to make the diffusion of heat to the radiation fins efficient will be described.
FIG. 6 is a view showing another embodiment of the heat sink with a heat pipe of the present invention. FIG. 6A is a plan view thereof, and FIG. 6B is a side view thereof. In the heat sink with heat pipe of this aspect, the heat density of the heat receiving block is changed by changing the arrangement density of the heat pipes, so that the heat is more efficiently diffused to the radiation fins. That is, the arrangement density of the plurality of heat pipes increases toward the hole for discharging the airflow to the outside.

  As shown in FIG. 6, also in this embodiment, annular thin plate fins 6 having the same shape, the inside of which is generally circular and the outside of which is also generally circular, are arranged in parallel in the vertical direction to form a cavity portion 9. The centrifugal fan 8 is disposed in the cavity formed as described above so that the rotation axis is perpendicular to the annular thin plate fin. In order to efficiently diffuse heat to the radiating fin portion 6, also in this aspect, the heat receiving block 2 and the radiating fin portion 6 are thermally connected by a heat pipe. However, as shown to Fig.6 (a), the arrangement | positioning density of a heat pipe is high toward the hole part for the heat pipe which penetrates an annular thin-plate fin to discharge | emit an airflow outside. That is, most of the heat pipes 3, 23, 4, 22 are arranged in the vicinity of the hole. For example, two U-shaped round heat pipes and three L-shaped round heat pipes are combined.

  A cover 13 is provided so as to cover the outside of the radiating fin portion inserted through the vertical portion of the heat pipe. A part of the cover 13 is provided with a hole for discharging the air flow generated by the centrifugal fan to the outside. The cover 13 is provided so as to cover a part of the outer peripheral portion of the centrifugal fan 8 arranged in the cavity formed inside the plurality of annular thin plate fins 6 arranged in a stacked manner.

  In this embodiment, wind enters the impeller 7 of the centrifugal fan 8 vertically from above and below, and the wind flows parallel to the impeller 7 toward the heat radiation fins at 360 degrees. In this way, the wind that has flowed along the radiation fins is discharged out of the heat sink through the flow hole as shown by an arrow 32 in FIG. 6 along the hole for discharging the air flow to the outside. . By changing the arrangement density of the heat pipes in this way, a large amount of heat can be diffused to the heat dissipating fins on the hole side for discharging the air flow to the outside, and the heat dissipating efficiency can be improved.

In the embodiment described above, a part of the heat receiving block and the heat pipe are thermally connected, but a plurality of heat pipes that are thermally connected to the heat receiving block may be crossed.
FIG. 7 is a diagram for explaining another aspect of the heat sink with heat pipe of the present invention. FIG. 7A is a plan view thereof, and FIG. 7B is a side view thereof. FIG.7 (c) is AA 'sectional drawing in Fig.7 (a). FIG.7 (d) is BB 'sectional drawing in Fig.7 (a). In the heat sink with heat pipe of this aspect, a plurality of heat pipes are provided with intersecting portions that intersect at a portion where the heat pipes are thermally connected to the heat receiving block. The overall height of the heat pipe is substantially the same as the height of the non-intersecting portion of the individual heat pipes.

  FIG. 7A shows a state where no centrifugal fan is disposed in the cavity. As shown in FIG. 7A, for example, two U-shaped round heat pipes 3 and 4 and one L-shaped round heat pipe 5 cross and are thermally connected to the heat receiving block. . That is, the intersection of the three heat pipes exists in a portion that is thermally connected to the heat receiving block. Each heat pipe extends laterally from the heat receiving block, curves and extends vertically, and the vertical portion is inserted through the annular thin plate fin 6 and thermally connected.

  As shown in FIG. 7D, a groove portion is formed in the heat receiving block 2 and the heat pipe 3 is embedded in the groove portion at a portion other than the intersecting portion to reduce the thermal resistance. As shown in FIG. 7C, at the intersection, a groove is similarly formed in the heat receiving block, and one heat pipe is arranged in the center and the other two heat pipes are arranged up and down. The heat pipe is covered with two heat pipes from above and below. Each heat pipe is flattened and arranged so that the height of the three intersecting heat pipes is substantially the same as the height of the non-intersecting portion of the one heat pipe. As shown in FIG. 7C, the center heat pipe 3 is flattened from both sides. The upper heat pipe 5 is flattened from below to above, and the lower heat pipe 4 is flattened from above to below. By flattening and combining in this way, bulging is prevented from occurring at the intersection.

By providing the intersection at the portion thermally connected to the heat receiving block, the heat pipe can be arranged at the center of the heat receiving block, and the heat radiation efficiency can be further enhanced.
The plurality of heat pipes described above includes an intersecting portion that intersects at a portion where the heat pipe is thermally connected to the heat receiving block. At the intersecting portion, the individual heat pipes are flattened, and the height of the plurality of intersecting heat pipes is The feature that is substantially the same as the height of the non-intersecting portion of the individual heat pipes can also be applied to the embodiment described with reference to FIGS.

  Furthermore, in another aspect of the heat sink with a heat pipe of the present invention, another heat radiating fin is thermally connected to the heat receiving block. In this case, when the centrifugal fan takes in air from one of the radiating fin portions, a part of the heat is radiated by another radiating fin. This feature can also be applied to the embodiment described with reference to FIGS.

Further, another aspect of the heat sink with a heat pipe of the present invention is a heat receiving block that is thermally connected to a heating element that requires cooling,
A plurality of heat pipes that are thermally connected to the heat receiving block and transport heat from the heat receiving block, the plurality of heat pipes including an intersecting portion that intersects at a portion that is thermally connected to the heat receiving block; At the intersection, the individual heat pipes are flattened, and the overall height of the plurality of intersecting heat pipes is substantially the same as the height of the non-intersecting portions of the individual heat pipes;
A fin portion composed of a plurality of thin plate fins through which the heat pipe is inserted and thermally connected;
It is a heat pipe heat sink with a fan.

  In the heat sink with a heat pipe of this aspect, the plurality of heat pipes described above include an intersecting portion that intersects at a portion that is thermally connected to the heat receiving block, and at each intersecting portion, the individual heat pipes are flattened and intersected. The overall height of the plurality of heat pipes is substantially the same as the height of the non-intersecting parts of the individual heat pipes. The centrifugal fan is formed in the plurality of annular thin plate fins and the cavity formed inside the annular thin plate fins. The present invention can be widely applied not only to a heat sink that arranges a plurality of thin plate fins but also to a combination of a plurality of thin plate fins that do not have a cavity and a fan that is arranged on the side or above the thin plate fin.

Means (processing of the end portions of the cover, duct, and fin) for restricting the heat of the radiating fin in a specific direction can be applied to the heat sink with heat pipe of this aspect. Furthermore, a change in the arrangement density of the heat pipes for enhancing the heat radiation effect, a change in the area of the heat radiation fin, and the like can be similarly applied.
The heat receiving block 2 is made of a metal material having excellent thermal conductivity such as aluminum or copper, and the shape thereof can be appropriately selected according to the shape of the heating element such as a cylinder, a quadrangular column, or a polygonal column. it can. When connecting to a plurality of heat generating elements having different heights, unevenness may be formed on the heat receiving surface corresponding to the heat generating elements.

  As described above, in order to facilitate the connection between the heat receiving block and the heat pipe, a corresponding groove portion may be provided to increase the contact area between the heat pipe and increase the thermal conductivity. The heat pipe is not limited to this, but it is preferable to use a round heat pipe.

In the heat pipe-attached heat sink of the present invention, there may be a plurality of heating elements and a plurality of heat receiving part blocks thermally connected thereto. FIG. 8 is a diagram for explaining another aspect of the heat sink with heat pipe of the present invention. In this embodiment, two heat receiving blocks are provided which are thermally connected to the two heating elements, respectively. 8A is a perspective view seen from the front (upper) side, and FIG. 8B is a perspective view seen from the back (lower) side. Although not described in detail, the number of heat receiving blocks may be three or more so as to correspond to three or more heating elements.
As shown in FIG. 8 (a), annular thin plate fins 6 of the same shape, the inside of which is generally circular and the outside of which has a predetermined shape, are arranged in parallel in the vertical direction to form a hollow portion 9, and thus A centrifugal fan (not shown) is arranged in the cavity formed in the above so that the rotation axis is perpendicular to the annular thin plate fin. In order to efficiently diffuse heat to the radiating fin portion, the two heat receiving blocks 2a and 2b and the radiating fin portion 6 are thermally connected by the heat pipes 3, 4, and 5. That is, the two heat receiving portions 2a and 2b are disposed so as to be thermally connected to, for example, two heat generating elements located on both sides of the radiating fin portion. One end portion of each of the three round heat pipes is embedded in each heat receiving portion, and the other end portion is thermally connected through a plurality of annular thin plate fins. In this way, the heat of the two heat generating elements is efficiently transferred to the radiating fin portion.

  In addition, as described with reference to FIG. 3C, each of the annular thin plate fins 6 in which the space 9 having a substantially circular shape is formed is bent in one direction to form a vertical portion 61. The vertical portion 61 formed in this manner may be in contact with the upper surface 60 of the adjacent annular thin plate fin to close the end of the annular thin plate fin, and as described with reference to FIG. In addition, a cover 13 may be provided so as to cover the outside of the radiating fin portion inserted through the vertical portion of the heat pipe.

  Also in this aspect, wind enters the impeller of the centrifugal fan disposed in the cavity portion 9 vertically from the upper and lower portions, and the wind flows toward the radiation fins at 360 degrees in parallel with the impeller. In this way, the wind that flows along the radiating fins is guided by the flow being regulated by the vertical portion formed at the outer end portion or the cover, and is discharged outside the heat sink. According to this aspect, the heat of the plurality of heating elements can be efficiently radiated.

  Example

As shown in FIG. 7, a heat sink with a heat pipe of the present invention was produced. That is, 15 sheets of annular thin plate fins (radiation fins) made of aluminum with an outer diameter of 130 mm, an inner diameter of 100 mm (center is 5 mm eccentricity) and a thickness of 0.3 mm were prepared. Furthermore, two U-shaped copper heat pipes with a diameter of 5 mm and one L-shaped heat pipe were prepared. The heat radiation fins thus prepared were laminated at equal intervals, and the five heat radiation portions of each heat pipe were press-fitted into the laminated heat radiation fins and fixed. That is, the radiating fin and the heat pipe are thermally connected and fixed. Next, a groove was provided in the copper heat receiving block 2 and the heat pipe was fixed by caulking. Of course, it may be fixed with solder or adhesive.
The three heat pipes were crossed at the heat receiving part in order to further improve the heat radiation efficiency. At the intersection of the three heat pipes, the thickness of each heat pipe was flattened to 1.5 mm. The heat pipe located at the center was flattened from both sides, the heat pipe located below was flattened from above, and the heat pipe located above was flattened from below. The heat sink main body was produced by combining as described above.
The heat sink body thus manufactured has an impeller outer diameter of 98 mm, a thickness of 28.3 mm, a number of 18 centrifugal fans, an aluminum product, a thickness of 1 mm, an outer periphery 67R (with suction ports on the top and bottom), a height of 32.3 mm. Combined with the cover. The overall height was 58 mm.
The fan was DC 5 V and was driven at 2000 rpm.
An aluminum heater simulating a semiconductor was attached to the heat receiving block of the heat pipe heat sink produced in this way, and the performance was measured under the following conditions.
Input: 100W
Environmental temperature: 25 ° C
Fan 5V (2000 rpm)
Under the above conditions, the temperature at the center of the heat block was about 35 ° C. The noise was 27 db. The thermal resistance was about 0.1 ° C./W.
In addition, when the heat pipe was bent at a predetermined R and connected to the heat receiving block without providing the intersecting portion of the heat pipe, the thermal resistance was about 0.12 ° C./W.
As is apparent from the above description, it can be seen that the heat radiation efficiency is further increased by providing the intersections in the heat pipe.
As described above, according to the present invention, it is possible to provide a heat pipe heat sink with reduced height, low noise, compact size, and high heat dissipation efficiency.

FIG. 1 is a view showing one embodiment of a heat sink with a heat pipe according to the present invention. FIG. 1A is a plan view thereof, and FIG. 1B is a side view thereof. FIG. 2 is a diagram showing another embodiment of a heat sink with a heat pipe according to the present invention. FIG. 2A is a plan view thereof, and FIG. 2B is a side view thereof. FIG. 3 is a diagram showing another embodiment of the heat sink with a heat pipe according to the present invention. FIG. 3A is a plan view thereof, and FIG. 3B is a side view thereof. FIG. 4 is a view showing another embodiment of a heat sink with a heat pipe according to the present invention. FIG. 5 is a view showing another embodiment of a heat sink with a heat pipe according to the present invention. FIG. 5A is a plan view thereof, and FIG. 5B is a side view thereof. FIG. 6 is a view showing another embodiment of the heat sink with a heat pipe of the present invention. FIG. 6A is a plan view thereof, and FIG. 6B is a side view thereof. FIG. 7 is a diagram for explaining another aspect of the heat sink with heat pipe of the present invention. FIG. 7A is a plan view thereof, and FIG. 7B is a side view thereof. FIG. 7C is a cross-sectional view taken along line A-A ′ in FIG. FIG. 7D is a cross-sectional view taken along line B-B ′ in FIG. These are figures explaining other one aspect | mode of the heat sink with a heat pipe of this invention of this invention. 8A is a perspective view seen from the front (upper) side, and FIG. 8B is a perspective view seen from the back (lower) side. FIG. 9 is a view showing a conventional heat sink with a heat pipe. FIG. 9A is a left side view thereof, and FIG. 9B is a front view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat sink with heat pipe 2 Heat receiving block 3 Heat pipe 4 Heat pipe 5, 21, 22, 23 Heat pipe 6 Annular thin plate fin (radiation fin part)
7 Impeller 8 Centrifugal fan 9 Cavity 10 Intake air 11 Intake air 12, 32 Exhaust air 13 Cover 15 Duct

Claims (12)

One or more heat-receiving blocks that are thermally connected to one or more heating elements that require cooling;
A plurality of heat pipes thermally connected to the heat receiving block and transporting heat from the heat receiving block;
The heat pipe is inserted through and thermally connected, and a heat dissipating fin portion composed of a plurality of annular thin plate-like fins arranged in parallel to form a hollow portion therein, and
Arranged in the cavity so that the rotation axis of the centrifugal fan is substantially perpendicular to the annular thin plate-like fin, air is taken in from above and / or below the radiating fin, and to the side of the radiating fin. A heat sink with a heat pipe, which is equipped with a centrifugal fan that discharges air. The plurality of heat pipes are provided with intersections that intersect at a portion where the heat pipes are thermally connected to the heat receiving block, and at the intersections, the individual heat pipes are flattened, and the height of the entire plurality of intersecting heat pipes is increased. The heat sink with a heat pipe according to claim 1, wherein the height is substantially the same as a height of a non-intersecting portion of each heat pipe. The cover according to claim 1 or 2, further comprising a cover that covers the periphery of the heat dissipating fin portion, and a hole portion for discharging the air flow generated by the centrifugal fan to the outside in a part of the cover. Heat sink with heat pipe. The heat sink with heat pipe according to any one of claims 1 to 3, wherein the cover is formed by extending and bending a part of each of the plurality of thin plate fins arranged in parallel. The cover forms a duct for discharging the air flow that has passed through the thin plate fins in the vicinity of an outer end portion of the thin plate fin, and the duct has a hole for discharging the air flow to the outside. The heat sink with a heat pipe according to claim 3 or 4, wherein a cross-sectional area gradually increases toward the surface. The depth of the said radiation fin part seen from the said centrifugal fan side is gradually expanding toward the hole part for discharging | emitting the said air flow outside, The any one of Claim 3 to 5 Heat sink with heat pipe. The heat sink with a heat pipe according to claim 6, wherein an arrangement density of the plurality of heat pipes increases toward a hole for discharging the air flow to the outside. Another heat radiation fin is thermally connected to the heat receiving block, and when the centrifugal fan takes in air from one of the heat radiation fins, part of the heat radiation fin radiates heat. The heat sink with a heat pipe according to any one of claims 1 to 7. One or more heat-receiving blocks that are thermally connected to one or more heating elements that require cooling;
A plurality of heat pipes that are thermally connected to the heat receiving block and transport heat from the heat receiving block, the plurality of heat pipes including an intersecting portion that intersects at a portion that is thermally connected to the heat receiving block; At the intersection, the individual heat pipes are flattened, and the overall height of the plurality of intersecting heat pipes is substantially the same as the height of the non-intersecting portions of the individual heat pipes;
A fin portion composed of a plurality of thin plate fins through which the heat pipe is inserted and thermally connected;
Heat sink with heat pipe consisting of a fan. The heat according to claim 9, further comprising a cover that covers the periphery of the radiating fin portion, and a hole portion for exhausting an air flow generated by the centrifugal fan to the outside in a part of the cover. Heat sink with pipe. The heat sink with heat pipe according to claim 10, wherein the cover is formed by extending and bending a part of each of the plurality of thin plate fins arranged in parallel. The heat sink with a heat pipe according to claim 10 or 11, wherein an arrangement density of the plurality of heat pipes increases toward a hole for discharging the air flow to the outside.

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