WO2011068259A1

WO2011068259A1 - Heatsink

Info

Publication number: WO2011068259A1
Application number: PCT/KR2009/007159
Authority: WO
Inventors: 김성진; 김주완; 김동권
Original assignee: 한국과학기술원
Priority date: 2009-12-02
Filing date: 2009-12-02
Publication date: 2011-06-09
Also published as: CN102713486A; US20120305224A1

Abstract

The heatsink of the present invention comprises: a heat-radiating plate in which a plurality of heat-radiating fins are disposed uniformly spaced apart from each other and then in concentric circles in a number of rings, and in which channels are formed between each of the banks of rings and passageways are formed between the heat-radiating fins successively spaced apart in each ring; and a centrifugal fan which is formed with a plurality of blades disposed in concentric circles in a number of rings so as to be disposed between the channels, and which is adapted to rotate and thereby to alternately obstruct the passageways and the channels of each ring and to couple with the heat-radiating plate and thereby create a pressure difference between the internal and the external air and so cause the external air to be drawn in and expelled back out.

Description

Heatsink

The present invention relates to a heat sink, more specifically, to arrange the heat dissipation fin and the blade in a multi-stage concentric circle, and then divide the area of the heat dissipation fin composed of the multi-stage concentric circles by mutual coupling to improve the flow of air to improve the cooling efficiency. It is about a heatsink which makes it possible.

Recently, according to the trend of high integration, high performance, and miniaturization of semiconductor chips and packages including the same, electronic products are rapidly becoming high performance. Accordingly, the performance of electronic products can be improved by quickly and efficiently dissipating heat generated therein during operation of electronic products. Various attempts have been actively made to keep it smooth, and this heat emission problem has become an important factor in the development of electronic products.

In particular, as the capacity of the CPU and the peripheral electronic components used in the electronic equipment becomes relatively large, the heat generation amount is extremely increased.

Thus, cooling means have been provided to stably provide the functions of electronic products.

First, the electronic chip cooling apparatus disclosed in Korean Patent Laid-Open Publication No. 10-2004-52010 includes a terminal base which directly contacts a heating element such as a CPU and conducts heat, a heat pipe soldered on the upper end of the terminal base, A heat dissipation block soldered to the end of the heat pipe, a fan motor positioned at the center thereof to supply cooling fluid to the heat dissipation block, a base frame to which the fan motor and the terminal base are fixed, and a fan motor of the base frame. In the electronic chip cooling device consisting of a fan cover for blocking the most of the installation unit except the top center so that the cooling fluid can be efficiently introduced and discharged, by soldering the fan cover formed under the installation line of the heat pipe to the heat pipe By integrating, the heat pipe conducts heat to the room It is configured to be used as a heat sink to.

The electronic chip cooling device conducts heat generated from a heating element such as a CPU to the

heat pipes

120 and 130 through the terminal base 110 and is moved to the heat dissipation blocks 140 and 150 formed at each end of the

heat pipes

120 and 130. The heat moved to the heat dissipation blocks 140 and 150 is cooled by causing forced convection by driving the fan motor 160.

In addition, the cooling device for computer parts presented in the Republic of Korea Patent No. 10-600448 is a device for cooling the heat generating parts that generate heat during operation of the components built into the computer, can receive the heat generated from the heat generating parts. A heat transfer block which is tightly coupled to the heat generating parts; At least one heat pipe including a heat transfer block coupling portion coupled to the heat transfer block so as to receive heat from the heat transfer block, and a heat radiation fin coupling portion bent to form a curved shape; And a plurality of heat dissipation fins coupled to the heat dissipation fin coupling portion of the heat pipe, and spaced apart from each other along the heat dissipation fin coupling portion.

The cooling device for a computer component configured as described above serves to cool the heat by dissipating heat into the air from the part of the portion coupled to the heat block 10 through the heat pipe when heat is transferred from the heat-generating electronic component to the heat block. The plurality of heat dissipation fins are configured to cool the computer components by allowing the air flow generated by the cooling fan to pass through the heat dissipation fins to allow the air flow to be discharged to the outside in a spiral manner with respect to the rotation axis of the cooling fan.

However, the cooling device of the prior art as described above is made by applying an axial fan to flow the outside air along the rotational axis of the fan to pass through the heat radiating fins and then flow out in the axial direction. There was a problem falling.

That is, the temperature of the heat dissipation fin is cooled through an axial fan installed on the upper part of the heat dissipation fin through which heat of a heat generating component such as a CPU is transferred. The upper part of the heat dissipation fin is first touched by the wind by the wind generated by the axial fan. As it cools, it is allowed to cool in turn through a plurality of lower heat radiation fins.

At this time, the wind generated from the axial fan has a problem that the cooling intensity is lowered due to the low wind strength by the interference of the heat radiation fins.

As described above, as the cooling power of the lower portion of the heat sink fin close to the CPU drops due to the interference of the heat sink fins, the lower part of the heat sink fin near the CPU has a higher temperature, whereas the upper part of the heat sink fin far from the CPU has a relatively high temperature. There was a problem that the phenomenon that the lower the heat emission efficiency is lowered.

Therefore, an object of the present invention is to form a heat sink by combining the heat sink with a centrifugal fan arranged in concentric circles of multiple stages, and then rotate the centrifugal fan so that each stage of the fin is repeatedly divided in and out of the air. To improve the flow.

In order to achieve this object, the heat sink of the present invention is provided with a plurality of heat dissipation fins spaced at equal intervals, and then arranged in concentric circles of multiple stages to form a channel between each single layer and a passage between the heat dissipation fins sequentially spaced at each end. By forming a plurality of heat sinks and a plurality of blades arranged in concentric circles of the plurality of stages so as to be disposed between the channels, the channel and the passages of each stage are alternately blocked by rotation, so that the difference between the internal and external air pressures by coupling with the heat sinks It is composed of a centrifugal fan that generates and introduces external air to the inside to release it to the outside.

According to the present invention, the heat dissipation plate is provided with a second flange for mounting the heat dissipation fins vertically upwards, and is configured by mounting the motor vertically upwards on the second flanges upper surface.

According to the present invention, the centrifugal fan provides a first flange for mounting the blade vertically downward on the bottom surface to form an inlet hole in the center of the first flange, the coupling block supported by the rib on the top surface is the center of the inlet hole It is positioned so as to be fixed to the rotating shaft of the motor by the coupling hole formed in the coupling block is configured to rotate the centrifugal fan.

According to the present invention, the passage has a space between the radiating fins sequentially spaced at equal intervals in a state in which the radiating fins are arranged in concentric circles in a plurality of stages, and the space is radially formed outwardly from the center of the second flange in a virtual arc shape.

According to the present invention, the blade is configured to be arranged to cross between the channel and the passage of each stage of the heat sink.

According to the present invention, the heat dissipation fin and the blade is formed so that one side has an inclined surface, the inclined surface is formed to have an angle from the outside to the inclined surface in the rotational direction of the centrifugal fan.

As described above, in the heat sink of the present invention, a heat sink is formed by combining a heat sink with a centrifugal fan having concentric fins arranged in multiple stages, and then rotating the centrifugal fan so that each end of the fin is repeatedly divided. There is an effect of improving the cooling efficiency by increasing the outside air inflow by making a difference in the pressure inside and outside the sink.

In addition, the heat sink of the present invention can minimize the volume by the overlapping combination of the centrifugal fan and the heat sink is effective in miniaturizing the product.

1 is an exploded perspective view showing a heat sink of the present invention.

Figure 2 is a perspective view of the heat sink of the present invention.

Figure 3 is a front sectional view showing a heat sink of the present invention.

Figure 4 is a front view showing a heat sink of the heat sink of the present invention.

Figure 5 is a front view showing a centrifugal fan of the heat sink of the present invention.

Figure 6 is a plan sectional view showing a heat sink of the present invention.

Figure 7 is a photograph showing the experimental state of the heat sink of the present invention.

Explanation of symbols on the main parts of the drawings

100: heat sink 100: centrifugal fan

110: first flange 111: inlet hole

120: rib 130: coupling block

131: hole 140: blade

150: slope 200: heat sink

210: second flange 220: motor

221: rotating shaft 230: heat dissipation fin

240: channel

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in the drawings, the same components or parts are to be noted that the same reference numerals as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

Figure 1 is an exploded perspective view showing a heat sink of the present invention, Figure 2 is a perspective view showing a heat sink of the present invention, Figure 3 is a front sectional view showing a heat sink of the present invention, Figure 4 is a heat sink of the present invention Figure 5 is a front view showing a heat sink, Figure 5 is a front view showing a centrifugal fan of the heat sink of the present invention, Figure 6 is a cross-sectional view showing a heat sink of the present invention, Figure 7 is a photograph showing an experimental state of the heat sink of the present invention to be.

First, as shown in Figures 1 to 6, the heat sink 10 of the present invention is composed of a heat sink 200 and a centrifugal fan 100.

The heat sink generates a difference in air pressure inside and outside the 10 so that the outside air is introduced into the heat sink 10 and then discharged to the outside so as to perform heat exchange.

The heat sink 200 is provided with a plate-shaped second flange 210, the motor 220 is fixed vertically upward in the center of the upper surface of the second flange 210 to position the rotating shaft 221 of the motor 220 upward.

Then, the heat radiation fin 230 having a surface on the upper surface of the second flange 210 is installed upright.

Here, a plurality of heat dissipation fins 230 are provided so that the heat dissipation fins 230 are spaced at a predetermined interval and are arranged in a circular shape so that a passage 250 for inducing the flow of air in the space between the heat dissipation fins 230 is formed.

The passage 250 allows the space between the heat dissipation fins 230 to be sequentially spaced at equal intervals in a state in which the heat dissipation fins 230 are arranged in the concentric circles of the plurality of stages so that the space between the heat dissipation fins 230 is substantially arc-shaped in a radial direction from the center of the second flange 210.

As described above, a plurality of heat dissipation fins 230 having a circular structure are arranged in concentric circles in multiple stages to stagnate the flow of air between the stages, thereby forming a channel 240 for heat exchange to the heat dissipation fins 230.

The channel 240 is formed of at least one, and in the present invention, four channels having four channels 240 are formed.

In addition, the centrifugal fan 100 is provided with a plate-shaped first flange 110, and installs a plurality of blades 140 having a surface in a vertical downward direction on the lower surface of the first flange 110.

The blades 140 are arranged in concentric circles of multiple stages so as to be located between the channels 240, and the blades 140 alternately block the channels 240 and the passages 250 of each stage by intersecting the positions of the blades 140 of each stage.

The heat dissipation fin 230 and the blade 140 to have one side has an inclined surface, the inclined surface is formed to have an angle from the outside of the inclined surface in the rotational direction of the centrifugal fan 100 so that the air can flow smoothly step by step of each channel 240. do.

In addition, the centrifugal fan 100 forms an inlet hole 111 in the center of the first flange 110, and the coupling block 130 supported by the ribs 120 on the upper surface thereof is positioned in the center of the inlet hole 111 to form the coupling block 130. The rotation shaft 221 of the motor 220 is fixed to the ball 131 to rotate the centrifugal fan 100 on the heat sink 200.

The heat sink 10 of the present invention configured as described above is mounted in close contact with the electronic product to be cooled.

Referring to the operation of the present invention as follows.

First, the blister and the heat dissipation fin 230 arranged in concentric circles of the multi-stage assume the first innermost channel 240, and the channels arranged outward will be referred to as second and third stages.

When the rotation shaft 221 is rotated by applying a driving signal to the motor 220, the first flange 110 is interlocked by the coupling block 130 fixedly integrated with the rotation shaft 221 to rotate the blade 140.

Here, the blade 140 rotates in each channel 240 of the heat sink 200.

Outside air flows into the inlet hole 111 of the centrifugal fan 100 and air flows into the channel side of the second stage through the passage 250 of the first stage, and the introduced air is introduced into the second stage channel 240 by the blade 140 of the second stage. It flows into the channel between the front and rear surfaces of the two heat sink fins 230.

At this time, the heat conduction to the heat dissipation fin 230 and then flows through the passage 250 to the third stage channel 240 is repeatedly performed to discharge the air to the outside through the passage 250 located on the outermost side.

As such, when the air flows through the heat dissipation fin 230, the heat dissipation plate 200, which is transferred through the second flange 210 of the heat dissipation plate 200 in close contact with the cooling target electronic product, may be cooled by inflow of external air.

Looking at the thermal capacity experiment example of the heat sink 10 using the heat sink 10 of the present invention under the following experimental conditions.

After connecting a heater to the bottom surface of the heat sink 10 to provide heat to create a heat providing environment that is expressed in electronic products, and heat measurement for measuring the heat temperature changes in accordance with the number of revolutions of the centrifugal fan in the heat sink 100 The device is provided.

[Table 1] below is the value measured by the thermometer.

Table 1

Heat Sink 10 RPM	Thermal resistance (K / W)
550	0.87152
580	0.83054
710	0.76863
720	0.75675
815	0.70693
850	0.67474
965	0.62133
1015	0.60006
1075	0.57428
1100	0.53267
1190	0.51314

Substituting the measured value into the following Equation 1, the thermal resistance is measured by dividing the difference between the temperature of the highest point and the external fluid by the amount of heat applied to the heat sink 10.

Equation 1

In this way, the resulting results are shown in a graph as follows.

As seen above, it can be seen that the temperature is rapidly lowered as the value of the heat sink 10 RPM of the present invention increases, which can prove the excellent cooling efficiency of the heat sink 10 of the present invention.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have the knowledge of.

Claims

A heat sink having a plurality of heat dissipation fins spaced at equal intervals and then arranged in concentric circles of multiple stages to form a channel between each monolayer and a passage between the heat dissipation fins sequentially spaced at each stage;

Forming a plurality of blades arranged in concentric circles of multiple stages so as to be arranged between the channels alternately block the channels and passages of each stage by rotation to generate a difference in the internal and external air pressure by combining with the heat sink to the outside air Heat sink, characterized in that consisting of a centrifugal fan to be introduced into the inside to be discharged back to the outside.
The method of claim 1,

The heat sink is provided with a second flange for mounting the heat radiation fins vertically upwards, the heat sink is characterized in that the motor is mounted on the upper surface of the second flange vertically upwards.
The method of claim 1,

The centrifugal fan provides a first flange for mounting the blade vertically downward on the bottom surface to form an inlet hole in the center of the first flange, so that the coupling block supported by the rib on the top surface is located in the center of the inlet hole. Heat sink, characterized in that configured to rotate the centrifugal fan by fixing the rotating shaft of the motor to the coupling hole formed in the coupling block.
The method of claim 1,

The passage is a heat sink, characterized in that the space between the radiating fins sequentially spaced at equal intervals in a state in which the radiating fins are arranged in multiple concentric circles, in a virtual arc shape in a radial direction outward from the center of the second flange.
The method of claim 1,

The blade is a heat sink, characterized in that configured to be arranged to cross between the channel and the passage of each stage of the heat sink.
The method of claim 1,

The heat dissipation fin and the blade is one side to have an inclined surface, the inclined surface is a heat sink characterized in that it is formed to have an angle from the outside to the inclined surface in the rotational direction of the heat sink.