JP2009004523A - Cooling device and heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device capable of maintaining a cooling efficiency over a long period. <P>SOLUTION: There is installed a rotation fin having a mechanism by which each disk-type fin is rotated by laminating the same number of sheets of disk-type fins having the same thickness as a heat radiating fin in parallel with the heat radiating fin in the same spacing at a front side portion of the heat radiating fin equivalent to a cooling wind intruding port of a heat sink, and by rotating a rotation axis penetrating a center of the each disk-type fin. The rotation axis of the rotation fin is interlocked with a wheel mechanism installed outside an electronic instrument. The rotation axis is rotated by rotating the wheel mechanism, and the rotation fin is interlocked and rotated. By rotating the rotation fin, dust adhering to the rotation fin is stored in stoppers arranged between each fin at a lower side of the rotation fin. A user can suitably eject the stored dust from an opening and closing slot for a dust ejection provided at a base portion just under the rotation fin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat sink and a heat sink in a heat sink in an electronic device mounted with a cooling structure that conducts heat from a heat generating element to a heat sink having a plurality of heat dissipation fins, and cools air by flowing into the heat sink. In particular, the present invention relates to a technique effective in preventing clogging due to dust adhering to a heat radiating fin.

  In recent years, with an increase in CPU performance due to an increase in computer speed, the power consumption and heat generation of the CPU have increased remarkably. For cooling a high heating element such as a CPU, a heat sink having a plurality of radiating fins and a fan for flowing cooling air between the radiating fins are used. Generally, in an environment where a computer is installed, dust floats in the air, and dust adheres when cooling air is applied to the radiating fins. Conventionally, in order to increase the surface area of the radiating fins and improve the cooling performance, the pitch of the radiating fins has become very narrow along with the high-density cooling design. Therefore, clogging due to dust is likely to occur on the heat radiation fins at the inlet of the cooling air to the heat sink, and the amount of cooling air flowing between the heat radiation fins is reduced. For this reason, there has been a problem that sufficient cooling efficiency cannot be maintained over a long period of time.

  Therefore, in order to solve this problem, there has been a proposal of a heat sink with a fan, such as Patent Document 1, in which the distance between the radiating fins in the high wind speed region is wide and the distance between the radiating fins in the low wind speed region is narrowed. .

  Further, as in Patent Document 2, a heat sink in which a gap on the air inlet side is formed narrower than a gap on the outlet side during the heat radiation operation, and the fan provided on the outlet side is rotated in the reverse direction during the maintenance operation. A dust adhesion preventing method has been devised in which dust accumulated on the inlet side can be discharged to the outside by flowing air.

JP-A-8-162787 JP 2005-347450 A

  In recent years, it has been necessary to increase the cooling efficiency of a heat sink with a fan due to an increase in the amount of heat generated by a CPU or the like. However, as described in Patent Document 1, the spacing between heat radiation fins at locations where clogging with dust is likely to occur is increased. As a result, there is a problem that the cooling efficiency is lowered.

  In the structure disclosed in Patent Document 2, since the gap on the air inlet side is narrow, the air volume of the cooling air flowing into the heat sink is reduced, and the cooling performance is deteriorated. Furthermore, dust is more likely to accumulate on the air inlet side, and it becomes difficult to discharge the dust that has become snowball-type to the outside, further reducing the cooling performance.

  An object of the present invention is to provide a cooling device and a heat sink capable of preventing clogging due to dust adhering to the heat radiating fins of the heat sink and maintaining sufficient cooling efficiency over a long period of time.

  According to the present invention, a cooling device having a mechanism for preventing clogging due to dust adhesion, a heat sink, a plurality of radiating fins mounted on the heat sink, a fan for introducing cooling air into the gap between the plurality of radiating fins, The same number of disk-shaped fins having the same thickness as the heat radiating fins are stacked at the same interval in parallel with the heat radiating fins on the front surface of the heat radiating fins corresponding to the cooling air flow entrance of the heat sink, and pass through the center of each disk-shaped fin And a rotating fin having a mechanism for rotating each of the disk-shaped fins as the rotating shaft rotates. The rotating shaft of the rotating fin is interlocked with a wheel mechanism installed outside the electronic apparatus. When the wheel mechanism is rotated, the rotating shaft is also rotated in conjunction with the rotating fin, and the rotating fin is rotated. By rotating the rotating fin, dust attached to the rotating fin is accumulated in a stopper disposed between the fins on the lower side of the rotating fin, and the accumulated dust is placed on the bottom surface directly below the rotating fin. A transparent dust discharge opening / closing slot that can be confirmed and discharged from the above is provided.

  According to the present invention, clogging due to dust adhering to the radiating fin can be prevented, and sufficient cooling efficiency over a long period of time as a heat sink can be maintained.

  Hereinafter, the present invention will be described with reference to the drawings.

  A first embodiment of the present invention is shown in FIGS. FIG. 1 shows an overall view of an electronic apparatus and positions of a cooling device and a heat sink according to the present invention. 2A is a perspective view of the cooling device and the heat sink of the present invention, FIG. 2B is a side view of the inside of the rotary fin and the heat sink, and FIG. 2C is a top view. FIG. 3 shows a detailed view of the connecting portion between the wheel mechanism and the rotating shaft.

  1 and 2, reference numeral 1 denotes a casing of an electronic device, and 3 denotes a heating element such as a CPU. The cooling device and the heat sink conduct heat to the heat sink 4 from the heat sink 4 formed of a material having good thermal conductivity such as copper or aluminum, a plurality of heat radiation fins 9 projecting on the heat sink 4, and the heating element 3. Heat pipe 2, fan 5 for introducing cooling air to heat sink 4, rotating fin 6 for attaching dust and its rotating shaft 7, wheel mechanism 8 for operating rotating fin 6 from the outside, rotating fin 6 includes a stopper 13 for accumulating dust adhering to 6 in one place, and a transparent dust discharge opening / closing slot 10 for confirming and discharging the accumulated dust from the outside.

  As shown by the arrow in FIG. 2A, the fan 5 takes in outside air from below the electronic device 1, introduces cooling air 11 toward the radiating fins 9, and exhausts air through the gaps between the radiating fins 9. When the cooling air 11 passes between the radiation fins 9, the heat sink 4 heated to high temperature by the heat of the heating element 3 that has been conducted through the heat pipe 2 is cooled.

  The gap between the radiating fins 9 is appropriately determined in consideration of the surface area of the radiating fins 9, the degree of pressure loss, etc. in order to ensure the necessary cooling performance. Considering the cooling performance when the gap is changed, the gap between the fins is about 1 to 1.5 mm.

  In the present invention, the rotating fin 6 is installed between the heat sink 4 and the fan 5. Each fin of the rotary fin 6 has a disk shape, and the thickness and the number of the fins are the same as those of the heat radiation fins 9 on the heat sink 4 and are arranged in parallel with the heat radiation fins 9. It will not interfere with the introduction. Further, the heat dissipating fins 2 on the heat sink 4 are curved in a semicircular shape in the same manner as the circular arc of the disk-shaped fins in order to avoid interference with the rotating fins 6.

  In the conventional comparative example for the present embodiment, there is no mechanism for accumulating and removing dust such as the rotating fin 6 between the heat sink 4 and the fan 5, and the outside air sucked from the fan 5 flows directly into the heat sink 4. It was. For this reason, dust contained in the outside air adheres to the front surface of the heat radiating fin 9 corresponding to the cooling air flow inlet of the heat sink 4, clogging accelerates like a snowman, and a sufficient cooling effect can be obtained only for a short period. I have done it.

  In the present embodiment, as shown in FIGS. 1 and 2, the rotating fin 6 is installed between the heat sink 4 and the fan 5. When the outside air sucked from the fan 5 flows between the rotating fins 6, the contained dust adheres to the rotating fins 6, so that the cooling air 11 passing between the heat dissipating fins 9 on the heat sink 4 is radiated. It does not contain dust of a size that adheres to the fins 9.

  As shown in FIG. 3, the dust adhering to the rotating fin 6 rotates the rotating shaft 7 directly connected to the wheel mechanism 8 by rotating the wheel mechanism 8 installed outside the electronic apparatus 1, and interlocks with it. Then, the rotating fin 6 rotates. The dust adhering to the end portion of the rotary fin 6 is accumulated in the stopper 13 disposed between the fins on the lower side of the rotary fin 6, and the user opens a transparent dust discharge opening / closing slot 10 provided on the bottom surface portion directly below the rotary fin 6. Therefore, the accumulated dust 14 can be appropriately discharged. The dust discharge opening / closing slot 10 is a slot that is opened / closed around the opening / closing shaft 12.

  By installing the rotating fin 6 between the heat sink 4 and the fan 5 as in the present embodiment, it is possible to avoid clogging due to dust adhering directly to the radiation fin 9 on the heat sink 4. Furthermore, the rotating fins 6 can accumulate attached dust, and can check and discharge the dust from the transparent dust discharge opening / closing slot 10 as appropriate, so that sufficient cooling efficiency over a long period can be maintained. Further, the thickness and the number of the fins of the rotary fin 6 are the same as those of the heat radiating fins 9 on the heat sink 4 and are arranged in parallel with the heat radiating fins 9, so that the cooling air 11 is introduced between the heat radiating fins 9. Therefore, the heat generating element 3 can be cooled without reducing the cooling efficiency.

  A second embodiment of the present invention is shown in FIGS. FIG. 4 shows a top view of the cooling device and heat sink of the present invention.

  2 and 4, reference numeral 1 denotes a casing of the electronic device, and reference numeral 3 denotes a heating element such as a CPU. The cooling device and the heat sink conduct heat to the heat sink 4 from the heat sink 4 formed of a material having good thermal conductivity such as copper or aluminum, a plurality of heat radiation fins 9 projecting on the heat sink 4, and the heating element 3. Heat pipe 2, fan 5 for introducing cooling air to heat sink 4, rotating fin 6 for attaching dust and its rotating shaft 7, rotating fin gear 19 installed at the tip of rotating shaft 7, rotating fin gear A hinge gear 18 that interlocks 19 by operating the hinge 17, a stopper 13 for accumulating dust attached to the rotating fin 6 in one place, and transparent dust discharge for checking and discharging the accumulated dust from the outside It is composed of an open / close slot 10.

  As shown by the arrow in FIG. 2A, the fan 5 takes in outside air from below the electronic device 1, introduces cooling air 11 toward the radiating fins 9, and exhausts air through the gaps between the radiating fins 9. When the cooling air 11 passes between the radiation fins 9, the heat sink 4 heated to high temperature by the heat of the heating element 3 that has been conducted through the heat pipe 2 is cooled.

  The gap between the radiating fins 9 is appropriately determined in consideration of the surface area of the radiating fins 9, the degree of pressure loss, etc. in order to ensure the necessary cooling performance. Considering the cooling performance when the gap is changed, the gap between the fins is about 1 to 1.5 mm.

  In the present invention, the rotating fin 6 is installed between the heat sink 4 and the fan 5. Each fin of the rotary fin 6 has a disk shape, and the thickness and the number of the fins are the same as those of the heat radiation fins 9 on the heat sink 4 and are arranged in parallel with the heat radiation fins 9. It will not interfere with the introduction. Further, the heat dissipating fins 2 on the heat sink 4 are curved in a semicircular shape in the same manner as the circular arc of the disk-shaped fins in order to avoid interference with the rotating fins 6.

  When the outside air sucked from the fan 5 flows between the rotating fins 6, the contained dust adheres to the rotating fins 6, so that the cooling air 11 passing between the heat dissipating fins 9 on the heat sink 4 is radiated. It does not contain dust of a size that adheres to the fins 9.

  The dust adhering to the rotating fin 6 causes the hinge gear 18 to rotate by operating the hinge 17 of the electronic device 1, and the rotating fin gear 19 directly connected to the hinge gear 18 is interlocked to cause the rotating fin 6 to move. Rotate. The dust adhering to the end portion of the rotary fin 6 is accumulated in the stopper 13 disposed between the fins on the lower side of the rotary fin 6, and the user opens a transparent dust discharge opening / closing slot 10 provided on the bottom surface portion directly below the rotary fin 6. Therefore, the accumulated dust 14 can be appropriately discharged. The dust discharge opening / closing slot 10 is a slot that is opened / closed around the opening / closing shaft 12.

  By installing the rotating fin 6 between the heat sink 4 and the fan 5 as in the present embodiment, it is possible to avoid clogging due to dust adhering directly to the radiation fin 9 on the heat sink 4. Furthermore, the rotating fins 6 can accumulate attached dust, and can check and discharge the dust from the transparent dust discharge opening / closing slot 10 as appropriate, so that sufficient cooling efficiency over a long period can be maintained. Further, the thickness and the number of the fins of the rotary fin 6 are the same as those of the heat radiating fins 9 on the heat sink 4 and are arranged in parallel with the heat radiating fins 9, so that the cooling air 11 is introduced between the heat radiating fins 9. Therefore, the heat generating element 3 can be cooled without reducing the cooling efficiency.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  The present invention can be applied as a cooling device for an electronic device that performs air cooling of a heating element.

The perspective view of Example 1 of this invention. (a)-(c) is a block diagram which shows the structure of this invention. (a)-(c) is detail drawing of the Example of FIG. The block diagram of Example 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic device, 2 ... Heat pipe, 3 ... Heat generating element, 4 ... Heat sink, 5 ... Fan, 6 ... Rotating fin, 7 ... Rotating shaft, 8 ... Wheel mechanism, 9 ... Radiation fin, 10 ... Dust discharge opening / closing slot DESCRIPTION OF SYMBOLS 11 ... Cooling air, 12 ... Opening-and-closing axis | shaft, 13 ... Stopper, 14 ... Dust, 15 ... Electronic equipment bottom face, 16 ... Rotation direction, 17 ... Hinge, 18 ... Hinge gear, 19 ... Rotation fin gear.

Claims (10)

In a cooling device comprising a heat sink body, a plurality of heat radiation fins mounted on the heat sink body, and a fan for introducing cooling air into the gap between the plurality of heat radiation fins,
A plurality of disc-shaped fins are stacked in parallel with the plurality of heat-dissipating fins mounted on the heat-sink body on the front surface of the heat-dissipating fins corresponding to the cooling air flow entrance to the heat sink, and pass through the center of each disc-shaped fin. A cooling device comprising a rotating fin having a mechanism for rotating each of the disk-shaped fins by rotating a rotating shaft.   The cooling device according to claim 1, wherein the thickness of each disk-type fin of the rotating fin is equal to a plurality of heat dissipating fins mounted on the heat sink body.   3. The cooling device according to claim 1, wherein an interval between the disk-shaped fins of the rotary fin is equal to an interval between a plurality of heat dissipating fins mounted on the heat sink body.   The cooling device according to any one of claims 1 to 3, wherein the number of disk-shaped fins of the rotating fins is equal to a plurality of heat dissipating fins mounted on the heat sink body.   A rotating shaft of the rotating fin is interlocked with a wheel mechanism installed outside the electronic device, and the rotating fin is rotated by rotating the wheel mechanism so that the rotating fin rotates. The cooling device according to any one of claims 1 to 4.   The cooling device according to any one of claims 1 to 5, wherein a dust discharge opening / closing slot capable of discharging dust is provided on a bottom surface portion directly below the rotary fin.   A stopper is provided in the dust discharge opening / closing slot so that dust attached to the rotating fin is accumulated under the rotating fin by rotating the rotating fin, and the stopper is disposed between the disk-shaped fins. The cooling device according to claim 6, wherein the cooling device is provided.   8. The cooling device according to claim 7, wherein the dust discharge opening / closing slot is made of a transparent material so that the accumulated amount of dust accumulated in the stopper can be grasped from the outside.   A heat sink, wherein the front end portions of the plurality of heat dissipating fins mounted on the heat sink body are curved in a semicircular shape in the same manner as the circular arc of the disk-shaped fin.   The rotating shaft of the rotating fin is linked to a hinge portion of a notebook electronic device, and the rotating shaft is also rotated in conjunction with opening and closing the display portion, whereby the rotating fin is rotated. Item 5. The cooling device according to any one of Items 1 to 4.

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