KR100605422B1 - Liquid circulation type cooling system - Google Patents

Abstract

The liquid circulation cooling system according to the present invention includes a circulation pump for circulating liquid and a heat exchanger disposed in the heat dissipation space for dissipating heat to the outside of the system. The heat exchanger includes a core unit, a liquid reservoir disposed on an upstream side of the core unit to store liquid and having a liquid opening, another liquid reservoir disposed on a downstream side of the core unit to store liquid and having a liquid opening; It includes a heat receiving member, a pipe, and a fan for supplying air to the heat exchanger to perform forced air cooling.

Heat exchanger, liquid opening, liquid reservoir, circulation pump, radiator

Description

Liquid circulation cooling system {LIQUID CIRCULATION TYPE COOLING SYSTEM}

1 is a schematic diagram illustrating a circuit of a conventional liquid circulation cooling system.

2 is a schematic diagram showing a circuit of a conventional liquid circulation cooling system disposed upside down.

3 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a first embodiment of the present invention.

4A is an enlarged side view showing a heat exchanger used in a liquid circulation cooling system according to a first embodiment of the present invention.

4B is an enlarged front view of the heat exchanger of FIG. 4A.

5 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a first embodiment of the present invention disposed upside down.

6 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a second embodiment of the present invention.

7A is an enlarged side view showing a heat exchanger used in a liquid circulation cooling system according to a second embodiment of the present invention.

FIG. 7B is an enlarged front view of the heat exchanger of FIG. 7A. FIG.

8 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a second embodiment of the present invention disposed upside down.

9A is an enlarged side view showing a heat exchanger used in a liquid circulation cooling system according to a third embodiment of the present invention.

9B is an enlarged plan view of the heat exchanger of FIG. 9A.

<Explanation of symbols for the main parts of the drawings>

10: liquid circulation cooling system

11: circulation pump

12: heat exchanger

13: heat receiving member

14: piping

15: fan

16: liquid reservoir

17: liquid reservoir

18: core unit

123: liquid opening

124: liquid opening

This application is based on Japanese Patent Application No. 2004-033761, the overall content of which is hereby incorporated by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid circulating cooling system in which liquid circulates in the system and dissipates heat by transferring heat generated from the heating element to the heat dissipation space by the liquid, in particular arranged in an inverted state as a result of the mounting of the cooling system. It relates to a liquid circulation cooling system mounted on an electronic device that can be.

In recent years, high-performance electronic devices have been developed, and in particular, the heat generation amount of circuit components such as power units and CPUs (central processing units) embedded in the main body is increasing. In this regard, improvements to heat dissipation to the outside are required.

As a means for promoting heat dissipation of a heat generating element, a cooling device in which a radiator made of a metal having excellent thermal conductivity is attached to a heat generating element such as a CPU and the radiator is air-cooled is known. However, the air-cooled cooling device requires a heat dissipation area for the radiator that responds to a considerable amount of heat dissipation, and consequently has the disadvantage of increasing the size of the cooling device. In addition, in recent years, the amount of heat dissipation of a CPU increases with the versatility and high-speed processing performance required of an electronic device. In this regard, the heat dissipation performance of the air-cooled cooling apparatus has virtually reached its limit.

In order to improve such poor heat dissipation, a liquid circulation cooling system in which a heat transfer medium such as a refrigerant is used is known (see, for example, Japanese Patent Application Laid-Open No. 2003-209210 (FIG. 2)).

1 is a schematic diagram showing a conventional liquid circulation cooling system circuit, in which a liquid circulation cooling system 50 is attached to a circulation pump 51 for circulating liquid and an element to be cooled such as a heating element to be cooled. A heat receiving member 53 which acts to effectively transfer heat from the element to the liquid, a radiator 52 disposed in the heat dissipation space and dissipating heat to the outside of the casing of the apparatus, and disposed above the radiator 52 and circulated A liquid reservoir 56 for storing a liquid, a header 57 disposed under the radiator 52, a pipe 54 made of a fixed pipe or a flexible tube and connecting the respective components to each other, It includes a fan 55 for providing air to the radiator 52 to perform forced air cooling.

In the liquid circulation cooling system 50, when the circulation pump 51 is driven, the liquid is circulated in the circulation circuit, so that heat generated from an element to be cooled, such as a heat generating element, is given to the heat receiving member 53 to heat it into the liquid. To pass. Therefore, the transferred heat is transmitted to the radiator 52 by the circulating liquid, and the heated liquid is forced air cooled by the fan 55 to radiate heat.

In the liquid circulation cooling system 50 described above, the liquid reservoir 56 is provided so that the amount of liquid in the system is kept constant while supplying liquid by connecting sections and surfaces of each component. In this connection, the cooling system 50 should have a sealing structure that prevents leakage of liquids when located close to the electronic device. However, if the cooling system has a sealing structure, the pressure change appears with the temperature change in the system. In particular, because the pressure increases as a result of the temperature rise of the liquid, the liquid reservoir 56 includes not only the liquid 56A but also the air layer 56B that can respond to the pressure increase. Moreover, if air is introduced into the circulation pump 51, the radiator 52 or the heat receiving member 53, the performance of the cooling system is significantly reduced, so that the position of the liquid reservoir 56 is usually the most effective of the system. Maintained in a high position.

In this regard, however, if the installation state of the electronic device used is fixed, the position of the liquid reservoir 56 can always be kept at the highest position in the device. If the installation state of the electronic device changes for the convenience of the user, that is, the electronic device is placed upside down, the liquid reservoir 56 is located at the bottom of the device.

FIG. 2 is a schematic diagram showing a circuit in the case where the liquid circulation cooling system 50 of FIG. 1 is disposed upside down, in which the header 57 is located on the top of the radiator 52, and the liquid is removed from the radiator. It flows in the direction of the circulation pump 51 through. However, since the air layer 57B exists in the header 57 above the liquid 57A, air also flows into the pipe 54 when the liquid flows into the pipe disposed on the downstream side of the header 57. When air is introduced into the piping 54, the circulation performance of the liquid is degraded, and consequently the circulation function of the system is significantly reduced.

An example of a case where the installation state of the electronic device is disposed upside down in use is a “projector”. Such a projector may be used while standing on the floor, or may be mounted on a ceiling for use. Thus, when the liquid circulation cooling system is mounted on the "projector", it is required to respond to this change in the state (inverted state) of the projector to be applied.

It is therefore an object of the present invention to provide a liquid circulation cooling system mounted to an electronic device in which the electronic device can be placed upside down.                         

In order to achieve the above object, the liquid circulation cooling system according to the present invention,

A member for receiving heat from a heat generating element such as a semiconductor element,

A reservoir for storing a liquid for transferring heat,

A radiator for radiating heat transmitted from the member through the liquid,

A system for circulating liquid between the reservoir, the radiator and the member,

The radiator includes a heat exchanger and a fan for forcibly supplying air to the heat exchanger.

In the liquid circulation cooling system of the present invention, the reservoir acts as a header for supplying liquid to the core unit of the heat exchanger.

In the liquid circulation cooling system of the present invention, the cooling system operates even in an inverted installation state.

In addition, the liquid circulation cooling system according to the present invention,

A heat dissipation space for dissipating heat of the liquid heated by the heating element, and a system for circulating the liquid through the heat dissipation space,

The heat dissipation space is provided with a first liquid reservoir on the first side, a second liquid reservoir on the second side in series with the first liquid reservoir, and a liquid opening provided on the first and second liquid reservoirs for connection to the liquid circulation system. Wherein the first and second liquid reservoirs are arranged perpendicular to another level,

Even if the first liquid reservoir is disposed at a higher position than the second liquid reservoir, the liquid opening of the first liquid reservoir is filled with liquid, and the second liquid reservoir is disposed at a higher position than the first liquid reservoir. Even if the liquid opening of the second liquid reservoir is filled with liquid.

In the liquid circulation cooling system of the present invention, the heat dissipation space includes a core unit provided to be connected through between the first and second liquid reservoirs to provide a heat exchanger.

Moreover, the liquid circulation cooling system according to the present invention,

A heat dissipation space for dissipating heat of the liquid heated by the heat dissipation element, and a system for circulating the liquid through the heat dissipation space,

The heat dissipation space is provided with a first liquid reservoir on the first side, a second liquid reservoir on the second side in series with the first liquid reservoir, and a liquid opening provided on the first and second liquid reservoirs for connection to the liquid circulation system. Wherein the first and second liquid reservoirs are arranged horizontally at different levels,

The liquid openings of the first and second liquid reservoirs are filled with liquid even if the cooling system is installed upside down.

In the liquid circulation cooling system according to the invention, the heat dissipation space includes a core unit provided to be connected through between the first and second liquid reservoirs to provide a heat exchanger.

In the liquid circulation cooling system of the present invention, the heat exchanger has a "corrugated straight fin core" type structure comprising a tube, a fin and a header, and the header acts as a liquid reservoir.                         

In the liquid circulation cooling system of the present invention, a fan for supplying air for forcibly cooling the heat exchanger is disposed outside the heat exchanger.

In the liquid circulation cooling system of the present invention, the liquid reservoir is provided with a liquid level sensor which generates a warning signal when the liquid is insufficient.

According to the liquid circulation cooling system of the present invention, each of the liquid reservoirs for storing liquid is disposed on the upstream and downstream sides of the heat dissipation space, respectively, and at least the liquid opening of the liquid reservoir disposed on the downstream side is always liquid. Is filled. Thus, even if the liquid circulation cooling system is disposed upside down, it is possible to prevent air from flowing into the system in addition to the liquid reservoir. As a result, the electronic device can be arranged in an inverted state, and the scope of application of the liquid circulation cooling system can be widened.

The invention will be explained in more detail in conjunction with the accompanying drawings.

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

First embodiment

3 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a first embodiment of the present invention;

The liquid circulation cooling system 10 includes a circulation pump 11 for circulating a liquid such as water, a heat exchanger 12 disposed in a heat dissipation space to dissipate heat outside the casing of the system, and cooling such as a heating element. A heat receiving member 13 attached to the element to be attached and operative to effectively transfer heat from the element to be cooled to the liquid, and a tube 14 made of a fixed tube or flexible tube and connecting the above-described components to each other, And a fan 15 for supplying air to the heat exchanger 12 to achieve forced air cooling.

The heat exchanger 12 has a core unit 18, a liquid reservoir 16 formed at the top of the core unit 18 in the vertical direction in the figure, and another liquid reservoir formed at the bottom of the core unit 18 in the figure. Has 17. The core unit 18 and the liquid reservoirs 16, 17 are combined in one piece. The liquid reservoir 16 has a space of the same capacity as the liquid reservoir 17 as opposed to the inside of the tank. The entire space inside the liquid reservoir 17 is filled with liquid, and the liquid reservoir 16 includes the liquid layer 16A and the air layer 16B.

4A is an enlarged side view of the heat exchanger 12, and FIG. 4B is an enlarged front view of the heat exchanger 12, the heat exchanger 12 having a core unit 18 and a core unit ( Heat exchanger having a "corrugated straight fin core" consisting of a liquid reservoir 16 disposed on top of 18 and another liquid reservoir 17 disposed on the bottom of core unit 18. to be.

The core unit 18 has a flat tube 122 made by soldering with a metal such as aluminum and is in a "pleated straight pin core" achieved by the combination of corrugated fins 121 made from a metal such as aluminum having good heat dissipation.

Moreover, in the heat exchanger of the "wrinkled straight fin core" type structure, both the upper and lower headers act as liquid reservoirs 16 and 17 respectively formed in sizes having a capacity required to act as a liquid reservoir.

The liquid reservoir 16 has a space of the same capacity as the liquid reservoir 17 as opposed to the inside of the tank. Moreover, a liquid opening 123 through which liquid is introduced and discharged is provided on the lower side of the liquid reservoir 16, and the same liquid opening 124 is also provided on the upper side of the liquid reservoir 17. The liquid opening 123 may be connected to the liquid opening 124 through the piping 14 shown in FIG. 3.

Moreover, the liquid reservoir 16 is provided on the side with an injection / degassing nozzle 125 which acts to inject liquid into the liquid reservoir and to regulate the pressure of air in the liquid reservoir 16.

The internal capacity of the liquid reservoir 16 and the internal capacity of the liquid reservoir 17 are the amount of air for adjusting the volume of the entire system and the increase in the internal pressure according to the increased volume when the liquid temperature rises, The amount of liquid component lost in the system (the amount of liquid replenishment) is determined. Injection / degassing nozzle 125 is closed except when liquid is injected.

Next, the operation of the liquid circulation cooling system 10 will be described with reference to FIGS. 3, 4A and 4B.

In Fig. 3, when the liquid circulation pump 11 is first driven, the liquid filled in the liquid circulation system is forcibly moved. The heat receiving member 13 acts to transfer thermally conducted heat from the heating element, which is the element to be cooled, to the liquid. Thereafter, the liquid is forcibly delivered to the heat exchanger 12 through the pipe 14. As shown in FIG. 4A, when liquid is introduced into the heat exchanger 12 from the liquid opening 123 provided on the liquid reservoir 16, the liquid passes from the liquid reservoir 16 to the core unit 18. do. Within the core unit 18, heat dissipates from the fins 121 associated with the tube 122 when the liquid passes through the tube 122 as shown in FIG. 4B. Air is introduced into the heat exchanger 12 by the fan 15 (see FIG. 3) to promote heat dissipation in the fin 121.

On the other hand, the liquid delivered to the liquid reservoir 17 comes out of the liquid opening 124 and is delivered to the liquid circulation pump 1 through the pipe 14 (see FIG. 3). In this series of flows, the internal pressure is increased in the liquid circulation system due to the temperature rise as the liquid receives heat from the device to be cooled. However, in this case the increased amount of pressure is absorbed by the air layer 16B in the liquid reservoir 16 as a bumper.

And, the operation of the liquid circulation cooling system 10 when the cooling system is disposed upside down is described with reference to FIG.

Fig. 5 is a schematic diagram showing a case where the circuit of the liquid circulation cooling system 10 according to the first embodiment of the present invention is disposed upside down. In this situation, when the liquid circulation pump 11 is driven, the liquid filled in the liquid circulation system is forcibly moved in the direction indicated by the arrow, and heat from the heat generating element, which is the element to be cooled, is transferred to the liquid in the heat receiving member 13. Thermally conducted. The liquid is forced through the tubing 14 into the liquid reservoir 16 in the heat exchanger 12, heat is radiated from the liquid as the liquid passes through the core unit 18, and then the liquid is stored in the liquid reservoir ( From 17) to the liquid circulation pump (11).

As described above, in FIG. 5 a liquid reservoir 17 is disposed in the head of the core unit 18, and liquid is introduced from the core unit 18 through the liquid reservoir 17 to the circulation pump 11. do. In this situation, there is an air layer 17B on the liquid layer 17A in the liquid reservoir 17. In this connection, since the discharge port for the liquid (liquid opening 124 of Figs. 4A and 4B) is filled with liquid, the air flows when the liquid flows into the pipe 14 downstream of the liquid reservoir 17. Does not flow into piping 14. Therefore, even if the liquid circulation cooling system 10 is disposed upside down, there is no air in the liquid in the pipe 14, so that the flow rate decrease due to the reduction of the circulation of the liquid and the stop of the pump can be prevented.

According to the liquid circulation cooling system 10 of the above-described first embodiment, the following effects can be achieved.

(1) A liquid opening 123 is provided on the side where the core unit 18 is connected to the liquid reservoir 16, and a liquid opening 124 is provided on the side where the core unit 18 is connected to the liquid reservoir 17. . In this situation, even if the electronic device equipped with the liquid circulation cooling system is placed upside down, the liquid openings 123 and 124 are always filled with liquid so that air is not introduced into the liquid in the pipe 14. Therefore, a decrease in the flow rate and stop of the pump due to the decrease in the circulation of the liquid can be prevented.

(2) A heat exchanger having a "pleated straight fin core" type structure is used as the heat exchanger of the present invention, wherein the upper and lower header sections each act as a liquid reservoir. Thus, even if a plurality of liquid reservoirs are not disposed in opposite portions, respectively, the tube 122 is always filled with refrigerant. For this reason, the structure of the liquid circulation circuit can be simplified, thereby increasing the number of parts to be provided and increasing the space for mounting the liquid circulation cooling system can be suppressed, thus miniaturizing the electronic device while ensuring good heat dissipation. And cost reduction can be realized.

(3) Since the air layer 16B is present in the liquid reservoir 16 or the air layer 17B is present in the liquid reservoir 17 to offset the increase in pressure in the liquid circulation system, An increase in pressure due to a change in temperature can be absorbed.

Second embodiment

6 is a schematic diagram showing a circuit of a liquid circulation cooling system according to a second embodiment of the present invention;

The liquid circulation cooling system 20 includes a circulation pump 21 for circulating the liquid, a heat exchanger 22 disposed in the heat dissipation space to dissipate heat to the outside of the casing of the system, and an element to be cooled such as a heating element. A heat receiving member 23 which acts to effectively transfer heat from the element to be attached and cooled to the liquid, a tubing 24 made of stationary tubing or flexible tubes and interconnecting the above-described components, and a heat exchanger ( A fan 25 for supplying air to the air to achieve forced air cooling.

The heat exchanger 22 has a core unit 18, a liquid reservoir 26 formed on the left side with respect to the core unit 18 in the drawing, and another liquid reservoir formed on the right side with respect to the core unit 18 in the drawing ( 27). The core unit 18 and the liquid reservoirs 26, 27 are combined in one piece. The liquid reservoir 26 has a space of the same capacity as the liquid reservoir 27 as opposed to the inside of the tank. The liquid reservoir 26 includes a liquid layer 26A and an air layer 26B, and the liquid reservoir 27 includes a liquid layer 27A and an air layer 27B.

FIG. 7A is an enlarged side view of the heat exchanger 22, and FIG. 7B is an enlarged plan view of the heat exchanger 22, the heat exchanger 22 being the core unit 18, 18) A heat exchanger having a "pleated straight fin core" type structure composed of a liquid reservoir 26 disposed on the left side and another liquid reservoir 27 disposed on the right side of the core unit.

The core unit 18 is formed in the same manner as the liquid circulation cooling system 10 of the first embodiment.

The liquid reservoir 26 has a space of the same capacity as the liquid reservoir 27 as opposed to the inside of the tank. Furthermore, a liquid opening 223 through which liquid is introduced and discharged is provided in the liquid reservoir 26 on the right side of the core unit 18, and the same liquid opening 224 is provided on the left side of the core unit 18. Also provided in (27). The liquid opening 223 may be connected to the liquid opening 224 through the tubing 24 shown in FIG. 6.

Moreover, the liquid reservoir 26 is provided on the side with an injection / degassing nozzle 225 which acts to inject liquid into the liquid reservoir and to regulate the pressure of air in the liquid reservoir 26.

Subsequently, the operation of the liquid circulation cooling system 20 will be described with reference to Figs. 6, 7A and 7B.

In Fig. 6, when the liquid circulation pump 21 is first driven, the liquid filled in the liquid circulation system is forcibly moved. The heat receiving member 23 acts to transfer heat that is thermally conducted from the heating element, which is the element to be cooled, to the liquid. Thereafter, the liquid is forcibly delivered to the heat exchanger 22 through the pipe 14. As shown in FIG. 7A, when liquid is introduced into the heat exchanger 22 from the liquid opening 224 provided on the liquid reservoir 27, the liquid passes from the liquid reservoir 27 to the core unit 18. do. Within the core unit 18, heat dissipates from the fins 121 associated with the tube 122 when liquid passes through the tube 122 as shown in FIG. 7B. Air is introduced into the heat exchanger 22 by the fan 25 (see FIG. 6) to promote heat dissipation in the fin 121.

On the other hand, the liquid delivered to the liquid reservoir 26 exits the liquid opening 223 and is delivered to the liquid circulation pump 21 through the pipe 24 (see FIG. 6).

And, the operation of the liquid circulation cooling system 20 when the cooling system is disposed upside down is described with reference to FIG.

Fig. 8 is a schematic diagram showing a case where the circuit of the liquid circulation cooling system 20 according to the second embodiment of the present invention is disposed upside down. In this situation, when the liquid circulation pump 21 is driven, the liquid filled in the liquid circulation system is forcibly moved in the direction indicated by the arrow, and heat from the heating element, which is the element to be cooled, is transferred to the liquid in the heat receiving member 23. Thermally conducted. The liquid is forced through the tubing 24 into the liquid reservoir 27 in the heat exchanger 22, heat is radiated from the liquid as the liquid passes through the core unit 18, and then the liquid is discharged from the liquid reservoir ( From 26 to the liquid circulation pump 21.

As mentioned above, the liquid is introduced from the core unit 18 to the circulation pump 21 through the liquid reservoir 26 in FIG. In this situation, there is an air layer 26B on the liquid layer 26A in the liquid reservoir 26. In this regard, since the discharge port for the liquid (liquid opening 223 of Figs. 7A and 7B) is filled with liquid, air in the case where the liquid flows into the pipe 24 downstream of the liquid reservoir 26 Does not flow into piping 24. Therefore, even if the liquid circulation cooling system 20 is disposed upside down, there is no air in the liquid in the pipe 24, so that the flow rate decrease and the stoppage of the pump due to the reduction of the circulation of the liquid can be prevented.

According to the liquid circulation cooling system 20 of the second embodiment described above, the same effect as the liquid circulation cooling system 10 of the first embodiment can be achieved.

Third embodiment

9A is a side view showing the structure of the heat exchanger 32 used in the liquid circulation cooling system according to the third embodiment of the present invention, and FIG. 9B is a plan view of the heat exchanger 32, showing the heat exchanger 32. FIG. Is a "corrugated straight pin core consisting of a core unit 18, a liquid reservoir 36 disposed on the left side of the core unit 18 in the figure, and another liquid reservoir 37 disposed on the right side of the core unit 18. Is a heat exchanger with "type structure

The heat exchanger 32 has a liquid opening 323 through which liquid can be introduced and discharged on the liquid reservoir 36 side where the liquid reservoir 36 is perpendicular to the side to which the core unit 18 is connected, The liquid opening 324, which is the same as the liquid opening 323, is provided on the side of the liquid reservoir 37 perpendicular to the side to which the core unit 18 is connected and the side of the liquid opening 324 is connected to the liquid opening 323. In the opposite direction, the liquid reservoir 36 has the same structure as the heat exchanger 22 except that the injection / degassing nozzle 325 is provided on the top side. Injection / degassing nozzle 325 acts to inject liquid into the liquid reservoir and regulate air pressure within the liquid reservoir 36.

If the heat exchanger 32 is used at the position of the heat exchanger 22 in the liquid circulation cooling system 20 shown in FIG. 6, the same as the liquid circulation cooling system 20 according to the second embodiment of the present invention. The effect can be achieved.

The heat exchanger includes two liquid reservoirs in the above embodiments, but the heat exchanger may include three or more liquid reservoirs. Moreover, although the structure in which the core unit 18 is formed in a single layer with respect to the direction in which air passes is described, two or more layers can be applied in response to the amount of heat radiation. Moreover, although the liquid reservoir for the refrigerant has not been disposed separately in the liquid circulation system, such liquid reservoirs can be disposed separately in the liquid circulation system.

In addition, by attaching a liquid level sensor to the liquid reservoir, it can be arranged to generate a warning signal when the refrigerant in the liquid reservoir decreases.

It will be apparent to those skilled in the art that the present invention may be practiced in other specific forms without departing from the basic features or spirit.

Therefore, the embodiments disclosed herein are all for the purpose of illustration and not limitation. The scope of the invention is indicated by the appended claims rather than the foregoing description, and all changes which come within the meaning and range of equivalents are included therein.

According to the present invention, there is provided a liquid circulation cooling system mounted on an electronic device in which a flow rate decrease due to a reduced circulation of a liquid, a stop of a pump, and the like can be prevented and the electronic device can be disposed upside down.

Claims (13)

Liquid circulation cooling system (10), A member 13 for receiving heat from a heat generating element such as a semiconductor element, Two or more reservoirs 16, 17 for storing liquid 16A for transferring heat, A radiator for radiating heat transferred from the member 13 through the liquid, A liquid circulation pump (11) for circulating the liquid (16A) between the reservoirs (16, 17), the radiator and the member (13), The radiator includes a heat exchanger 12 and a fan 15 for forcibly supplying air to the heat exchanger 12, Each of the reservoirs 16, 17 has liquid openings 123, 124 connected to the liquid circulation pump 11, and the liquid openings 123, 124 are both liquid when mounted normally and upside down. Circulating cooling system filled with. The liquid circulation cooling system according to claim 1, wherein the reservoir (16, 17) acts as a header for supplying liquid (16A) to the core unit (18) of the heat exchanger (12). delete Liquid circulation cooling system (10), A heat dissipation space for dissipating heat of the liquid 16A heated by the heat generating element, and a liquid circulation pump 11 for circulating the liquid 16A through the heat dissipation space, The heat dissipation space includes a first liquid reservoir 16 on a first side, a second liquid reservoir 17 and a liquid circulation pump 11 on a second side in series with the first liquid reservoir 16. Liquid openings 123, 124 provided on the first and second liquid reservoirs 16, 17 so as to be connected to the first and second liquid reservoirs 16, 17 vertically at different levels. Arranged, Although the first liquid reservoir 16 is disposed at a higher position than the second liquid reservoir 17, the liquid opening 123 of the first liquid reservoir 16 is filled with the liquid 16A, and the first liquid reservoir 16 is filled with the first liquid reservoir 16. Liquid circulating cooling system in which the liquid opening 124 of the second liquid reservoir 17 is filled with liquid 16A even though the second liquid reservoir 17 is disposed at a higher position than the first liquid reservoir 16. . 5. A liquid circulating type according to claim 4, wherein said heat dissipation space comprises a core unit (18) provided to penetrately connect between the first and second liquid reservoirs (16, 17) to provide a heat exchanger (12). Cooling system. Liquid circulation cooling system (20), A heat dissipation space for dissipating heat of the liquid 26A heated by the heat dissipation element, and a liquid circulation pump 21 for circulating the liquid 26A through the heat dissipation space, The heat dissipation space includes a first liquid reservoir 26 on the first side, a second liquid reservoir 27 and a liquid circulation pump 21 on the second side in series with the first liquid reservoir 26. And liquid openings 223 and 224 provided on the first and second liquid reservoirs 26 and 27 to be connected to the first and second liquid reservoirs 26 and 27, which are arranged at different levels horizontally. , Liquid openings (223, 224) of the first and second liquid reservoirs (26, 27) are filled with liquid (26A) even if the cooling system (20) is installed upside down. 7. A liquid circulating type according to claim 6, wherein said heat dissipation space comprises a core unit (18) provided to penetrately connect between the first and second liquid reservoirs (26, 27) to provide a heat exchanger (22). Cooling system. 6. The heat exchanger (12) according to claim 5, wherein the heat exchanger (12) has a "corrugated straight fin core" type structure comprising a tube (122), a fin (121) and a header, the header having a liquid reservoir ( 16, 17) liquid circulation cooling system. 8. The heat exchanger (22) according to claim 7, wherein the heat exchanger (22) has a "pleated straight fin core" type structure comprising a tube (122), a fin (121) and a header, the header acting as a liquid reservoir (26, 27). Liquid circulation cooling system. 6. The liquid circulation cooling system according to claim 5, wherein a fan (15) is provided outside the heat exchanger (12) for supplying air to forcibly cool the heat exchanger (12). 8. A liquid circulation cooling system according to claim 7, wherein a fan (25) is provided outside the heat exchanger (22) for supplying air to forcibly cool the heat exchanger (22). 5. The liquid circulation cooling system according to claim 4, wherein the liquid reservoir (16, 17) is provided with a liquid level sensor which generates a warning signal when the liquid (16A) is insufficient. 7. The liquid circulation cooling system according to claim 6, wherein the liquid reservoir (26, 27) is provided with a liquid level sensor which generates a warning signal when the liquid (26A) is insufficient.

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