JP2007042724A - Heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve size reduction and manufacturing-cost reduction of a heat sink, while enhancing heat-dissipation performance by making the air flow smooth. <P>SOLUTION: The heat sink 1 is provided with a heat-receiving plate 2 mountable to a heat source, heat dissipating sections 3, 21 provided on the heat-receiving plate 2, and a cooling fan 4 provided so as to be capable of sending cooling air to the heat dissipating sections 3, 21. The heat dissipators 3, 21 are respectively provided with heat transfer plates 5, 22 erected on the heat-receiving plate 2, at a prescribed interval and heat-dissipating fins 6, 24 vertically interposed between the respective heat transfer plates 5, 22. Spaces 7 for sucking/exhausting the cooling air are formed between the lower end of the heat-dissipating fin 6 and the heat-receiving plate 2. Similarly, spaces 27 for sucking/exhausting the cooling air are formed between the lower end 26 of the heat-dissipating fin 24 and the heat-receiving plate 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a CPU (Central Processing) of a personal computer.
Unit) and a heat sink provided for cooling electronic components such as thyristors and power capacitors.

  Conventionally, heat sources such as the electronic components described above have been provided with heat sinks in order to release heat generated from the heat sources. This heat sink is roughly constituted by a heat receiving plate provided so as to be in contact with a heat source, a heat radiating fin provided on the heat receiving plate, and a cooling fan provided above the heat radiating fin.

  And as the heat radiation fins provided in this kind of heat sink, corrugated fins that are formed by corrugating metal thin plates are often used, and the corrugated fins are disposed sideways on the heat receiving plate, so that the cooling air is supplied to the fins. It was necessary to flow sideways according to the installation direction. In other words, in this case, when cooling air is blown from above to the corrugated fins, the ridges of the corrugated fins block the flow of the cooling air and cool down to the inner area surrounded by the ridges and the rising parts on both sides thereof. Since air does not flow in and the heat dissipating performance of the heat dissipating fins cannot be sufficiently exhibited, it is difficult to employ corrugated fins as heat dissipating fins in the type of heat sink provided with a cooling fan above the heat dissipating fins.

  Therefore, in recent years, in order to improve the air evacuation property of the radiating fin and improve the heat radiating performance, a through hole is formed in the peak portion of the corrugated fin, or an inclined louver is cut and raised at the rising portion of the fin. The slit holes are also formed (see, for example, Patent Documents 1 and 2).

In addition, a stacked fin type heat sink in which press-formed fins are stacked in the horizontal direction and a cut-and-fin fin type heat sink having fins cut and raised by cutting have been developed.
Japanese Utility Model Publication No. 06-46180 Registered Utility Model No. 3010603

  However, as described above, in a heat sink in which a through hole is formed in the peak portion of the fin or a slit hole is formed in the rising portion of the fin, it is extremely difficult to perform a processing operation for forming the through hole or the slit hole. There is a problem that it takes time and effort, increases the number of steps, and makes it difficult to reduce the manufacturing cost. Furthermore, there is a problem that it is difficult to form a smooth air flow due to the ventilation resistance when the cooling air passes through the through holes and the slit holes, and it is difficult to reduce the blowing power and to reduce the size of the heat sink.

  In addition, since the fins are stacked in the horizontal direction in the stacked fin type heat sink, the height of the heat radiating fins must be increased to secure a sufficient heat radiating area, and the heat sink can be downsized. However, it was difficult to plan.

  Furthermore, in the cut-and-raised type heat sink, since the radiating fins are formed by cutting, it is difficult to narrow the gap between the fins or to form thin fins, and sufficiently improve the radiating performance. There was a problem that could not.

  The present invention has been made to solve the above-described problems, and is intended to provide a heat sink that can smooth the air flow, improve the heat dissipation performance, and reduce the size and the manufacturing cost. is there.

  The present invention is a heat sink comprising a heat receiving plate that can be attached to a heat source, a heat radiating portion provided on the heat receiving plate, and a cooling fan provided so that cooling air can be blown to the heat radiating portion. The heat dissipating section includes a heat transfer plate erected at a predetermined interval on the heat receiving plate, and heat dissipating fins interposed in the vertical direction between the heat transfer plates, and a lower end of the heat dissipating fin and the heat receiving member. A space for intake and exhaust of the cooling air is formed between the plates.

  In addition, the heat transfer plate may be provided such that a portion where the amount of heat transfer from the heat receiving plate is large is narrowed.

  Furthermore, the heat radiating fins may be provided such that the higher the heat transfer amount from the heat receiving plate to the heat transfer plate, the higher the height.

  Further, the present invention is a heat sink comprising a heat receiving plate that can be attached to a heat source, a heat radiating portion provided on the heat receiving plate, and a cooling fan provided so that cooling air can be blown to the heat radiating portion. The heat dissipating part includes a heat transfer plate installed in a spiral shape on the heat receiving plate, and a heat dissipating fin interposed in a vertical direction between the heat transfer plates, at a lower end of the heat transfer plate. The cooling air intake / exhaust opening is formed, and the cooling air intake / exhaust space is formed between the lower end of the radiating fin and the heat receiving plate. .

  Further, the heat radiating fin is preferably a corrugated fin.

  According to the present invention, the cooling air is evenly distributed over the entire heat radiating portion along the formation direction of the heat radiating fins, so that the heat radiating performance of the heat radiating portion can be improved. In addition, since the cooling air flows smoothly without being blocked by the radiating fins, the airflow resistance can be reduced, and the blowing power can be reduced and the size can be reduced. .

  When corrugated fins are used as heat radiating fins, the heat transfer area can be increased, heat radiating performance can be improved, and heat radiating fins can be easily formed, making it more compact and improving productivity, etc. Various excellent effects can be obtained.

  The heat sink according to the embodiment of the present invention will be described below with reference to FIG. Here, FIG. 1 is a front view showing the heat sink according to the present embodiment.

  The heat sink 1 according to the present embodiment includes a heat receiving plate 2, a heat radiating portion 3 provided on the heat receiving plate 2, and a cooling fan 4 provided so that cooling air can be blown from above to the heat radiating portion 3. It is mainly composed.

  The heat receiving plate 2 is made of aluminum and has a horizontal plate shape, and is formed so as to be in close contact with an electronic component such as a CPU, a thyristor, or a power capacitor that serves as a heat source.

  The heat radiating unit 3 includes a plurality of (seven in FIG. 1) heat transfer plates 5 erected vertically on the heat receiving plate 2 at predetermined intervals (equal intervals in the present embodiment), and each heat transfer plate. 5 and corrugated fins 6 interposed in the vertical direction. The heat transfer plate 5 is made of aluminum and has a vertical plate shape, and the corrugated fins 6 are formed by bending an aluminum thin plate into a waveform. Further, the corrugated fin 6 is formed so as to be lower than the heat transfer plate 5, and an exhaust space 7 is formed between the lower end of the corrugated fin 6 and the heat receiving plate 2. .

  The joining of the upper surface 8 of the heat receiving plate 2 and the lower end surface 9 of the heat transfer plate 5 and the joining of the rising surface 10 of the heat transfer plate 5 and the curved portion 11 of the corrugated fin 6 are both performed by brazing. The heat receiving plate 2 and the heat transfer plate 5 can be joined by a joining method such as soldering or caulking in addition to brazing.

  And in the heat sink 1 comprised in this way, when cooling air is sent with respect to the thermal radiation part 3 from the cooling fan 4, the cooling air will be in the air flow path 12 between each heat exchanger plate 5 from upper direction. Into the air flow path, descends in the air flow passage 12 while contacting the heat transfer plate 5 and the corrugated fins 6, passes through the exhaust space 7, and is discharged from the front and rear to the outside of the heat sink 1. Thereby, the heat generated from the heat source and transferred to the heat transfer plate 5 through the heat receiving plate 2 and the heat transferred from the heat transfer plate 5 to the corrugated fins 6 are efficiently released to the outside. The heat source is reliably cooled.

  As described above, according to the heat sink 1 according to the above-described embodiment, the corrugated fin 6 can be used even when cooling air is blown from above to the heat radiating portion 3, thereby increasing the heat transfer area. In addition to improving the heat dissipation performance of the heat sink, it is easy to mold the heat dissipation fins, and it is possible to reduce the size and improve the productivity.

  Further, since the cooling air circulates evenly over the entire air flow passages 12 in the vertical direction along the direction in which the corrugated fins 6 are formed, the heat dissipation performance can be further improved. Further, since the cooling air smoothly flows through the air flow passages 12 without being blocked by the corrugated fins 6, it is possible to reduce the ventilation resistance and to reduce the blowing power. And size reduction can be achieved.

  In the above embodiment, the seven heat transfer plates 5 are provided on the heat receiving plate 2 at equal intervals. However, this is merely an example, and the number and intervals of the heat transfer plates 5 can be variously set. It can be changed. Specifically, for example, as shown in FIG. 2, the portion where the amount of heat transfer from the heat receiving plate 2 is large (in the center in FIG. 2), the interval between the heat transfer plates 5 is set to be narrow, etc. Depending on the amount of heat generated from the heat source, the interval between the heat transfer plates 5 is changed, or the portion where the heat transfer amount from the heat receiving plate 2 is larger is provided such that the corrugated fins 6 are higher. The size of the exhaust space 7 may be changed according to the amount of heat generated from the heat source. By comprising in this way, the thermal radiation amount from the thermal radiation part 3 can be adjusted easily, and the heat | fever generated from the said heat source can be discharge | released outside efficiently.

  Moreover, in the said embodiment, although the corrugated fin 6 is used as a radiation fin of the thermal radiation part 3, you may use high performance fins, such as a straight fin, an offset fin, and a louver fin. Furthermore, the corrugated fins 6 can be subjected to wave forming or the like to further increase the contact area between the cooling air and the corrugated fins 6, thereby further improving the heat dissipation performance of the heat radiating unit 3.

  Furthermore, the material of the heat receiving plate 2, the heat transfer plate 5, and the corrugated fin 6 is not limited to the above-described aluminum, and may be other materials such as copper.

  Further, as shown in FIG. 3, the heat transfer plate 22 of the heat radiating portion 21 is formed in a spiral shape in accordance with the shape of the cooling fan 4 (see FIG. 1), and the air flow passage 23 between the heat transfer plates 22. The corrugated fins 24 may be interposed in the vertical direction. In this case, an exhaust opening 25 is formed at a required position at the lower end of the heat transfer plate 22, and an exhaust space 27 is formed between the lower end 26 of the corrugated fin 24 and the heat receiving plate 2. The cooling air flowing into the air flow passage 23 from above is discharged from the exhaust space 27 through the exhaust opening 25 to the outside of the heat sink.

  Furthermore, in the above-described embodiment, the cooling air is configured to circulate downward through the heat radiating units 3, 21, but may be configured to circulate upward. In this case, the exhaust spaces 7 and 27 and the exhaust opening 25 function as an intake space and an intake opening, respectively.

It is a front view which shows the heat sink which concerns on embodiment of this invention. It is a top view which shows the thermal radiation part of the heat sink which concerns on embodiment of this invention. It is a perspective view which shows another example of the heat sink which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat sink 2 Heat-receiving plate 3 Heat radiating part 4 Cooling fan 5 Heat-transfer plate 6 Corrugated fin 7 Exhaust space 21 Heat-radiating part 22 Heat-transfer plate 24 Corrugated fin 25 Exhaust opening 26 Corrugated fin lower end 27 Exhaust space

Claims (5)

A heat sink comprising a heat receiving plate that can be attached to a heat source, a heat radiating portion provided on the heat receiving plate, and a cooling fan provided so that cooling air can be blown to the heat radiating portion,
The heat radiating portion includes a heat transfer plate erected at a predetermined interval on the heat receiving plate, and a heat radiating fin interposed between the heat transfer plates in a vertical direction, and a lower end of the heat radiating fin and the heat receiving plate. A heat sink, wherein a space for intake and exhaust of the cooling air is formed between the two. 2. The heat sink according to claim 1, wherein the heat transfer plate is provided such that a portion having a larger amount of heat transfer from the heat receiving plate has a narrower interval. The heat sink according to claim 1 or 2, wherein the heat dissipating fins are provided such that the height of the heat dissipating fins increases as the amount of heat transfer from the heat receiving plate to the heat transfer plate increases. A heat sink comprising a heat receiving plate that can be attached to a heat source, a heat radiating portion provided on the heat receiving plate, and a cooling fan provided so that cooling air can be blown to the heat radiating portion,
The heat dissipating section includes a heat transfer plate standing in a spiral shape on the heat receiving plate, and a heat dissipating fin interposed in a vertical direction between the heat transfer plates, and the lower end of the heat transfer plate has the A heat sink, wherein a cooling air intake / exhaust opening is formed, and a cooling air intake / exhaust space is formed between a lower end of the radiating fin and the heat receiving plate. The heat sink according to any one of claims 1 to 4, wherein the radiation fin is a corrugated fin.

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