KR20100037421A - Heat sink, case and cooling plate having multi-stage structure - Google Patents

Abstract

The present invention relates to a heat sink, an enclosure, and a cooler having a multi-stage air separation structure, comprising: a heat dissipation fin formed of a plurality of stages which are integrally formed on the heat dissipation base or the housing and arranged in parallel and separated by a notch formed to be inclined; It is provided to be inclined to the air discharge side of each stage of the heat radiation fins to provide a heat sink having a multi-stage heat dissipation structure, characterized in that it comprises an air-blocking membrane to induce the flow of air heat dissipation and Cooling efficiency is improved.

Heat Sink, Heat Sink, Heat Sink Base, Notch

Description

Heat Sink, Case and Cooling Plate Having Multi-Stage Structure

The present invention relates to a structure of a heat sink, in particular a heat sink, enclosure and cooler having a multi-stage structure of air separation to form a plurality of parallel heat radiation fins of a multi-stage structure for the natural convection cooling of the high heating element to facilitate the heat dissipation. It is about.

Recently, high integration, high output, and miniaturization are progressing in electric, electronic, communication, and mechanical products. Accordingly, research on effective cooling method for heat-generating components has been conducted on heat pipes and carbon nanotubes. CNT), thermoelectric elements, liquid cooling, and heat sinks using porous materials. In general, a forced convection cooling method is used to form a space to be used as an air passage on one side of the heating component and to install a blowing means to force forced convection into the space. Due to the use of a blowing means such as a fan (Fan) has a disadvantage that frequent failures, the noise generated from the fan is large and power consumption is high. Therefore, when the calorific value is relatively low, the natural convection cooling method using a heat sink is widely used.

1 is a perspective view showing the structure of a conventional natural convection heat sink.

As shown in (a) of FIG. 1, the conventional parallel fin heat sink 4 has a structure in which a plurality of heat sink fins 2 are vertically formed on the heat dissipation base 1 and arranged in parallel. When low temperature air is introduced into the lower part of the parallel fin heat sink, the heat radiation fins 2 dissipate heat between the air drawn in and the heat dissipation fins 2, and the air discharged between the heat dissipation fins 2 dissipates heat emitted from the heat dissipation fins 2. An absorbing heat exchange process is performed. As such, the air introduced and introduced into the lower portion of the parallel fin heat sink 4 is expanded while being heated as it absorbs heat emitted from the heat sink fin 2, thereby lowering the density. As a result, a difference in density occurs between the air introduced between the outside air and the heat dissipation fins 2, and the air introduced by the buoyancy due to the difference is moved upwardly vertically in the passage between the heat dissipation fins 2, and the parallel fin heat sink As it is discharged to the upper portion of (4) is a heat radiation process to cool the heat sink is performed.

Figure 2 is a schematic diagram showing the air flow rate gradient between the flow rate of the conventional parallel fin heat sink (4) and the heat radiation fin (2).

As shown in (a) of FIG. 2, the outside air drawn in from the lower portion of the parallel fin heat sink 4 is heated while being moved up to the heat sink fin 2 on the top of the heat sink. As the air drawn into the lower part of the heat sink is heated up along the conduit while absorbing heat from the heat sink fins 2, the temperature of the air rising to the passage between the heat sink fins 2 increases continually, thereby increasing the inside of the heat sink fins 2. Increasing the average temperature of the flow air of the heat sink, in particular, the average temperature of the flow air in the upper portion of the heat radiation fin (2) increases the temperature difference with the heat radiation fin (2) is small, so that the heat exchange is not made smoothly, the efficiency of heat radiation is reduced Problem occurs.

In addition, since the vertical length of the heat dissipation fin 2 is long, the pipe resistance is increased, and thus the flow rate of air is reduced due to frictional loss with the heat dissipation fin 2. As shown in (b) of FIG. 2, the air introduced between the heat dissipation fins 2 flows through the long conduit in the surface of the heat dissipation fins 2 compared to the central flow velocity between the heat dissipation fins 2 by the friction of the heat dissipation fins 2 surface. This results in a velocity gradient where the flow velocity becomes relatively small. As such, when the flow rate of air on the surface of the heat dissipation fins 2 decreases, most of the flow rate of the introduced air is concentrated in the center portion between the heat dissipation fins 2 so that heat exchange between the inflowed air and the surface of the heat dissipation fins 2 is not performed properly. Since the heat dissipation fins 2 are not cooled effectively, the heat dissipation efficiency is lowered.

As described above, in the case of the conventional parallel fin heat sink 4, there is a problem that efficient heat dissipation is not performed due to problems of temperature rise, flow rate decrease, and velocity gradient of the air introduced between the heat sink fins 2.

On the other hand, as shown in Figure 1 (b), the notched parallel fin heat sink (5) is a method such as cross cutting (Fin) to the heat sink fin (2) of the conventional parallel fin heat sink (4) Notch (3) is formed by the structure, which is the speed at the surface of the heat radiation fin (2) by friction with the surface of the heat radiation fin (2) in the process of air rises along the flow path between the heat radiation fin (2) It is to increase the flow rate of the air in contact with the heat sink fin (2) to prevent the relatively small to be able to cool the heat sink more efficiently.

However, even by the notched parallel fin heat sink 5, the air introduced into the lower part of the heat sink rises vertically, so that the temperature rises. Therefore, the average temperature of the flow air in the heat sink fin 2 on the top of the heat sink is high. ), There is still a problem that the heat exchange between the air and the incoming air is not smooth. In addition, low-temperature outdoor air must be newly introduced into the notch 3 of the heat-dissipating fin 2, but the inflow of low-temperature external air is prevented by the flow of internal air rising vertically in the heat-dissipating fin 2, so that the heat of the heat-dissipating plate is not effectively released. That's what happens.

Therefore, the rising speed of the air is prevented from being lowered by the friction between the air inside the heat sink fins 2 and the heat sink fins 2 of the heat sink, and the average temperature of the air inside the heat sink fins 2 is kept low so that the heat sink fins 2 and There is an urgent need for a natural convection heat sink that facilitates heat exchange with internal air, but such a problem has not been achieved with conventional heat sinks.

The present invention was created to solve all the problems of the prior art as described above, so that low-temperature outdoor air easily flows into the heat sink, and prevents the speed decrease at the surface of the heat sink fin due to friction between the introduced air and the heat sink fins. In addition, an object of the present invention is to provide an enclosure having an external air separation multistage heat sink and an outdoor air separation multistage heat dissipation structure that maintains a low average temperature of the air introduced between the heat dissipation fins so that heat dissipation is performed smoothly.

In addition, the present invention is to facilitate the introduction of high temperature outside air into the heat sink, and to prevent the speed decrease due to friction between the introduced air and the heat radiating fins, and to maintain the average temperature of the air introduced between the heat radiating fins to cool the outside air It is another object of the present invention to provide an external air separation multi-stage cooler to perform smoothly.

The outdoor air separation multi-stage heat sink of the present invention for solving the above problems is a heat dissipation base to exchange heat adjacent to the heating element; A heat dissipation fin integrally formed in the heat dissipation base and arranged in parallel and separated by a notch formed to be inclined; It is characterized in that it comprises an air barrier film provided to be inclined at the air discharge side of each stage of the heat radiation fin to induce the flow of air.

At this time, the outdoor air separation multi-stage heat sink may be configured to further include a blowing means to perform a heat dissipation process by a forced convection method.

According to another aspect for solving the above problem,

In the enclosure having the external air separation multi-stage heat dissipation structure of the present invention, in the heat dissipation enclosure, a heat dissipation fin composed of a plurality of stages separated by a notch formed to be inclined is arranged in parallel on each side of the heat dissipation fin. The air discharge side of the air blocking film is characterized in that it is provided to be inclined to induce the flow of air.

According to another aspect for solving the above problem,

The outdoor air separation multi-stage cooler of the present invention includes a heat dissipation base configured to exchange heat with a low-temperature object; A heat dissipation fin integrally formed in the heat dissipation base and arranged in parallel and separated by a notch formed to be inclined; It is configured to include an air barrier film to be inclined to the air discharge side of each stage of the heat radiation fin to induce the flow of air, the heat radiation fin and heat radiation at low temperature from the hot air introduced into the air inlet side of each stage of the heat radiation fin As the heat transfer process is made to the base, the outside air is cooled.

The enclosure having the multi-stage heat dissipation plate and the multi-stage heat dissipation structure of the present invention has a heat dissipation fin separated into a plurality of stages, so that the air flow rate on the heat dissipation fin surface decreases due to friction between the surface of the heat dissipation fin and the introduced air. And thereby smoothing the flow of air to provide efficient heat dissipation.

At the same time, an air barrier is provided on the air discharge side of each stage of the heat sink fins so that the heated air is discharged to the outside of the heat sink, and cold air is stored at each stage of the heat sink fins without disturbing the inflow of outside air by the flow of rising air. Since it is supplied to the notch, it is possible to keep the average temperature of the introduced air low, thereby providing an effect of efficient heat dissipation by performing a smooth heat exchange.

In addition, the outdoor air separation multi-stage cooler of the present invention is a heat radiation fin is separated into a plurality of stages so that the air flow is made smoothly, efficient heat dissipation is carried out, air blocking membrane is provided on the air discharge side of each end of the heat radiation fin Maintaining the average temperature of the air is high to facilitate the heat exchange with the low temperature heat sink provides an effect of performing an efficient cooling process.

Hereinafter, with reference to the accompanying drawings will be described an external air separation multi-stage heat sink and enclosure and air separation multi-stage cooler.

Figure 4 is a perspective view showing the structure of the external air separation multi-stage heat sink 10 according to an embodiment of the present invention.

Referring to Figure 4, the outdoor air separation multi-stage heat sink 10 of the present invention is formed integrally and parallel to the heat dissipation base 11 and the heat dissipation base 11 provided adjacent to the heating element (not shown) It is configured to include a plurality of heat radiation fins 12.

The heat dissipation fin 12 is divided into a plurality of stages by a notch 13 formed to allow the inflow of outside air. For example, when the n-1 notches 13 are formed, the heat dissipation fin 12 is formed. Is divided into n stages.

An air blocking film 14 is formed on the air discharge side 12b of each stage of the heat dissipation fin 12 to induce the flow of air.

Therefore, the outside air flows into the air inlet side 12a of each stage of the heat dissipation fin 12, and the air that is introduced and rises between the heat dissipation fins 12 is fixed to the air discharge side 12b of the heat dissipation fin 12. It is discharged while moving along the bottom surface of (14).

FIG. 5 is an enlarged side view of portion A of the present invention shown in FIG. 4.

As shown in FIG. 5, the notch 13 is formed to be inclined with respect to the ground, and is formed in the shape of a parallelogram or a 'c' shape as viewed from the side of the heat sink 10. In addition, the angle α formed by the air barrier layer 14 and the heat dissipation base 11 provided at the air discharge side 12b of each stage of the heat dissipation fin 12 is preferably formed at an obtuse angle so that air can be smoothly discharged. .

Figure 6 is a side view of the air flow of the multi-stage heat sink of the air separation of the present invention, Figure 7 is an enlarged view of the portion C of Figure 6, Figure 8 is an air flow of the multi-stage heat sink of the air separation of the present invention. 9 is a partially enlarged view showing the air flow of the air separation multi-stage heat sink of the present invention from the front.

Hereinafter, the operation principle of the external air separation multistage heat sink of the present invention having the structure as described above with reference to FIGS. 6 to 9 will be described.

First, the heat radiated from the high temperature heating element is absorbed by the heat dissipation base 11, and the heat absorbed by the heat dissipation base 11 is transferred to the heat dissipation fin 12 integrally formed with the heat dissipation base 11. When the relatively low temperature outside air is introduced into the air inlet side 12a below the heat dissipation fin 12, heat is transferred from the heat dissipation fin 12 to the low temperature air according to Equation 1 below. The air that has been absorbed and the temperature rises becomes dense and rises. The air raised in this way is guided out of the heat dissipation fin through the bottom surface of the air barrier membrane 14 and is raised while drawing a parabola by buoyancy.

Equation 1

Q is the amount of heat exchanged, h is the convection heat transfer coefficient, Ts is the temperature of the heat sink, and T is the temperature of the outside air.

As shown in B of FIG. 6, the outside air flows into the first stage air inlet side 12a, and the introduced air cools only the first stage, and then the heat sink as shown in D of FIG. 6 and G of FIG. 7. It is discharged to the outside.

As shown in H of FIG. 7 and I and J of FIG. 8, new low-temperature outdoor air is introduced into two stages in a direction perpendicular to the radiating fin face of the notch of the parallelogram. The air rising while being heated to the air inlet side 12a of the second stage is cooled by cooling only the second stage and then rising on the bottom surface of the inclined two stage air barrier membrane 14 as shown in FIG. It is induced to be discharged out of the heat sink.

At this time, the high temperature first stage outflow air induced by the first stage air barrier membrane 14 to draw a parabola from the outside is further pushed out by the second stage outflow air. In this way, it is possible to cool the heat dissipation fins 12 at each stage from the low-temperature outdoor air flowing into both sides of the notch through the first stage, the second stage, and the third stage separated in the longitudinal direction of the heat sink. In addition, since the outside air is directly input to each stage, the flow rate of the outside air flowing into the heat sink can be increased, and since the air of each stage passes through a short flow path, the resistance of the pipe can be reduced, so that the surface of the heat sink fin can be reduced by friction of the heat sink fin (12). Can reduce the air flow rate.

In addition, since the air passing through the heat radiating fins 12 at the (n-1) stage is induced and discharged out of the heat sink by the air blocking film 14 at the (n-1) stage, the heat radiating fins 12 at the (n-1) stage are Low temperature outside air flows freely into the n-stage air inlet side 12a without being affected by the flow of the discharged air.

On the other hand, when the heat radiation fins 12 are separated into n stages, an air barrier layer may not be formed on the air discharge side 12b of the n stages. In this case, the air is vertically shown as shown in FIG. Will be discharged.

On the other hand, as can be seen in Equation 1, in order to lower the temperature (Ts) of the heat sink in natural convection cooling, the heat transfer coefficient (h) between the heat sink and the outside air should be increased. Therefore, the heat dissipation base 11 and the heat dissipation fin 12 are preferably made of a material having a high heat transfer coefficient, and more preferably, an aluminum material is used in consideration of economical efficiency and heat dissipation efficiency.

In addition, the outdoor air separation multi-stage heat sink of the present invention may be provided with a blowing means (not shown) for smoothing the flow of air, in which case the heat dissipation process is performed by a forced convection method.

EXAMPLE

Aluminum with heat radiation fins 12 with a width of 100 mm, a vertical length of 600 mm, and a thickness of 10 mm having a heat generation of 100 W in the total area, a protrusion length of 60 mm, a fin thickness of 2 mm, and a fin pitch of 10 mm. A heat sink made of a material was formed with a notch having an inclination angle of 135 °, and an air barrier film 14 made of aluminum was installed on the air discharge side 12b of each end of the heat dissipation fin 12, and then naturally cooled to 20 ° C in the outside air.

As a comparative example, as the heat dissipation fins 12 were formed on the heat dissipation base 11 having the same volume as in the above embodiment, the heat dissipation plate 12 was naturally cooled to 20 ° C. using a heat dissipation plate not provided with a notch and an air barrier film.

As described above, the results of measuring the temperature distribution of the heat sink are shown in FIG. 10, and the results of the comparative example are shown in FIG. 3.

In the case of the comparative example, as shown in FIG. 3, the maximum temperature reached 60.1 ° C., but in the case of the embodiment of the present invention, the maximum temperature was only 50.7 ° C. as shown in FIG. And, it can be seen that the outdoor air separation multi-stage heat sink of the present invention can obtain an excellent heat dissipation effect.

11 is a perspective view showing the housing 20 having a multi-stage heat dissipation structure of the outside air separation according to an embodiment of the present invention.

Referring to FIG. 11, the heat dissipation structure of the external air separation multi-stage heat sink as described above does not include a separate heat dissipation base 11, and also includes a heat dissipation fin 12 in the enclosure 15 itself. Applicable.

Since the heat dissipation process is performed similarly to the heat dissipation process of the outdoor air separation multi-stage heat sink of the present invention, the overlapping description of the same contents will be omitted.

12 is a perspective view showing an external air separation multistage cooler 30 according to an embodiment of the present invention, and FIG. 13 is an enlarged side view of the portion K shown in FIG. 12.

12 and 13, the outdoor air separation multi-stage cooler 30 of the present invention is integrally formed with the heat dissipation base 11 and the heat dissipation base 11 to exchange heat with a low-temperature object. It is configured to include a heat radiation fin 12 arranged in parallel.

The heat dissipation fins 12 are separated into a plurality of stages by the notches 13 formed to be inclined, and air introduced between the heat dissipation fins 12 is discharged to the outside of the heat sink at the air discharge side 12b of each stage of the heat dissipation fins 12. An air barrier film 14 is provided to guide the air.

The angle β formed by the air barrier layer 14 and the heat dissipation base 11 is preferably formed at an obtuse angle so as to smoothly discharge the air.

The hot air introduced into the air inlet side 12a of each stage of the heat dissipation fin 12 is transferred to the low temperature heat dissipation fin 12 and the heat dissipation base 11 according to Equation 1, and the temperature is lowered. As the density increases, it descends in the conduit between the heat sink fins 12. In this process, the outside air is continuously cooled by heat exchange between the heat radiating fin 12 and the descending air, and the cooled outside air is discharged to the outside of the heat sink along the upper surface of the air barrier layer 14 (1 in FIG. 13). ). Thus, the temperature difference between the high temperature outdoor air and the low temperature heat radiation fin 12 is largely maintained because hot air is introduced into each stage of the heat radiation fin 12 without being obstructed by the flow of air descending. Therefore, the heat exchange is performed smoothly, thereby maximizing the cooling efficiency.

1 is a perspective view showing the structure of a conventional natural convection heat sink.

Figure 2 is a schematic diagram showing the air flow rate gradient between the flow rate of the conventional parallel fin heat sink and the heat sink fins.

Figure 3 is a side view showing the temperature distribution of the conventional parallel fin heat sink.

Figure 4 is a perspective view showing the structure of the external air separation multi-stage heat sink according to an embodiment of the present invention.

5 is an enlarged side view of portion A of the present invention shown in FIG.

Figure 6 is a side view showing the air flow state of the air separation multi-stage heat sink of the present invention.

FIG. 7 is an enlarged view of a portion C shown in FIG. 6. FIG.

Figure 8 is a partially enlarged view showing the air flow of the air separation multi-stage heat sink of the present invention.

Figure 9 is a partially enlarged view showing the air flow of the air separation multi-stage heat sink of the present invention from the front.

10 is a view showing the temperature distribution of the external air separation multi-stage heat sink of the present invention from the side.

Figure 11 is a perspective view of the enclosure having a multi-stage heat dissipation structure of the external air separation according to an embodiment of the present invention.

12 is a perspective view showing an external air separation multistage cooler according to an embodiment of the present invention.

FIG. 13 is an enlarged side view of a portion K shown in FIG. 12. FIG.

♧ description of symbols for the main parts of the drawing

10: air separation multi-stage heat sink 11: heat sink base 12: heat sink fin

13: notch 14: air barrier 15: enclosure

20: enclosure with multi-layer heat dissipation structure

30: air separation multistage cooler

Claims (4)

A heat dissipation base adapted to exchange heat adjacent to the heating element; A heat dissipation fin integrally formed in the heat dissipation base and arranged in parallel and separated by a notch formed to be inclined; And an air shielding membrane provided to be inclined at the air discharge side of each stage of the heat dissipation fins to induce the flow of air. The method according to claim 1, The air separation separation multi-stage heat sink characterized in that the heat dissipation process is performed by a forced convection method further comprises a blowing means. In a heat-dissipating enclosure, The heat dissipation fin of the plurality of stages separated by the notch formed inclined is arranged in parallel on the heat generating side of the enclosure, Enclosure having an external air separation multi-stage heat dissipation structure, characterized in that the air shielding film is inclined on the air discharge side of each stage of the heat dissipation fins to induce the flow of air. A heat dissipation base adapted to exchange heat with a low temperature object; A heat dissipation fin integrally formed in the heat dissipation base and arranged in parallel and separated by a notch formed to be inclined; It is configured to include an air barrier film to be inclined to the air discharge side of each stage of the heat radiation fins to induce the flow of air, the heat radiation fins and heat radiation of the low temperature from the hot air introduced into the air inlet side of each stage of the heat radiation fins External air separation multi-stage cooler characterized in that the air is cooled as the heat transfer process to the base.

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