JPH11346079A - Cooling device of electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device which can restrain cooling liquid from spreading as far as possible even if cooling liquid leaks out of the cooling device which cools down an electronic equipment in which cooling liquid is used as cooling medium. SOLUTION: A cooling device 1 is equipped with a circulation path through which cooling liquid is made to circulate, a circulation pump 40 which sends out cooling liquid to circulate through the circulation path, a liquid path cutoff 80 which is capable of stopping the flow of cooling liquid, a detection sensor 64 which is capable of detecting leakage of cooling liquid, and a control circuit 70 which controls both the circulation pump 40 and the liquid path cutoff 80, where the cooling device 1 cools down an electronic equipment 10 using cooling liquid which circulates in the circulation path as cooling medium. The detection sensor 64 is covered with a surface material which absorbs cooling liquid, an absorption accelerating agent, and a liquid retention material, and when the sensor 64 detects the cooling liquid, it outputs leakage detection signals to the control circuit 70, and the control circuit 70 stops the circulation pump 40 when the leakage detection signals are inputted into it and enables the liquid path cutoff 80 to stop a flow of cooling liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling electronic equipment using a liquid as a medium.

[0002]

2. Description of the Related Art Conventionally, electronic equipment is often provided with a cooling device. FIG. 5 shows an example of a conventional cooling device. The cooling device 100 of FIG. 5 cools the circuit boards 11 and 11 built in the electronic device 200 using a liquid as a medium, and generates heat (waste heat) from the circuit boards 11 and 11.
Is transferred to the heat exchangers 13, 13, and the coolant, such as water, flowing through the heat exchangers 13, 13 warmed by the heat is stored in the liquid tank 50. The cooling liquid in the liquid tank 50 is supplied to the circulation pump 4
When the cooling liquid passes through the radiator 30, the temperature of the cooling liquid is reduced to a certain temperature or lower, and the cooling liquid again passes through the circulation path 20d and passes through the electronic device 200.

In such a cooling device 100, in order to cope with a case where the coolant leaks, a detection sensor 64 for detecting the leak of the coolant is attached. The detection sensor 64 is composed of two linear sensors. When contacting the coolant, the minute current flowing between these linear sensors changes, and outputs a leak detection signal to the control circuit 70. In response to this, the control circuit 70 immediately stops the circulation pump 40.

[0004]

As described above, when the coolant leaks, even if the circulation pump 40 stops immediately, the flow of the coolant circulating in the cooling device 100 stops immediately. Can't do it completely
Since the flow continues until the pressure in 20d is eliminated, there is a possibility that the cooling liquid will spread further. Further, since the liquid cannot be detected unless the coolant contacts the two linear sensors of the detection sensor 64 to a certain extent, even if the coolant leaks, the amount of the contacted fluid is very small or the coolant leaks. If the coolant does not contact the sensor, there is a possibility that the coolant may spread without being detected immediately.

In view of the above problems, the present invention provides a cooling device for cooling an electronic device using a liquid as a medium, in which even if the liquid leaks, the spreading range of the liquid can be suppressed as much as possible. Aim.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, the invention according to claim 1 of the present invention provides a circulating path through which a liquid circulates, and a circulating path through which the liquid circulates through the circulating path. A cooling device that cools an electronic device using the liquid circulating in the circulation path as a medium, the circulation prevention means being capable of stopping the flow of the liquid in the middle of the circulation path. It is characterized by having.

According to the cooling device for an electronic device of the present invention, in the cooling device for cooling the electronic device by the liquid circulating in the circulation path, the flow of the liquid may be stopped in the middle of the circulation path. Since the circulation preventing means is provided, if the liquid leaks from the circulation path, the pump can be stopped and the flow of the liquid can be stopped by the circulation preventing means. Therefore, even after the pump is stopped, even if the liquid continues to flow until the pressure in the circulation path is completely eliminated, the flow is stopped at the circulation prevention means in the middle of the circulation path,
The flow of the liquid can be stopped quickly, and the range in which the liquid spreads can be minimized.

Here, the pump and the circulation preventing means may be configured to be manually operated, or may be configured to be controlled by a control circuit. The electronic device is not particularly limited as long as it can be cooled by the cooling device of the present invention. For example, various electronic devices and devices on which a substrate on which an electronic circuit is formed are mounted.
In addition, as the liquid, water or an alcohol solvent generally used as a refrigerant is appropriately used.

According to a second aspect of the present invention, there is provided a circulation path through which the liquid circulates, and a detection sensor capable of detecting leakage of the liquid from the circulation path, and the medium circulating through the circulation path through the medium. In a cooling device for cooling an electronic device, the detection sensor is covered with an absorber that absorbs the liquid.

According to the cooling device for an electronic device of the present invention, since the detection device for detecting the liquid leaking from the circulation path is provided, and the detection sensor is covered by the absorber for absorbing the liquid, The leaked liquid is absorbed by the absorber,
It can be retained to prevent the spread of liquid. In addition, even if the leaked amount is a small amount, the detection sensor easily contacts the liquid via the absorber. In other words, the entire surface of the absorber becomes a detectable range of the liquid,
The detection range is larger than that in the case where only the linear sensor as in the related art is used as the detection range. Therefore, even if the amount of the leaked liquid is small, it is easily detected, and a user or the like can respond at an early stage of the leak. As a result, the spread of the liquid due to the leak can be suppressed as much as possible.

Here, the absorber can be processed into a shape that easily absorbs the liquid and covers the detection sensor, and includes various polymers and pulp. Further, the absorber may be made of one kind of polymer or the like, or may be made of several kinds of materials. Further, the electronic device and the liquid are the same as in the first aspect.

According to a third aspect of the present invention, there is provided a circulating path through which the liquid circulates, a pump for sending out the liquid so that the liquid circulates through the circulating path, and And a control unit for controlling the pump and the circulation prevention unit, the detection unit being capable of detecting leakage of the liquid from the circulation path, and a control unit for controlling the circulation prevention unit. A cooling device that cools an electronic device, using the liquid circulating in a path as a medium, wherein the detection sensor is covered with an absorber that absorbs the liquid, and detects the liquid and sends a signal to the control unit. A leak detection signal is output, and when the leak detection signal is input, the control unit stops the pump and controls the circulation prevention unit to a state in which the flow of the liquid is stopped. .

According to the cooling device for an electronic device of the third aspect, if the liquid leaks from the circulation path and is detected by the detection sensor, the pump is controlled by the control circuit that receives the leak detection signal. At the same time, the flow of the liquid is stopped by the circulation preventing means. Therefore, even after the pump is stopped, even if the liquid continues to flow until the pressure in the circulation path is completely eliminated, the flow is stopped at the circulation preventing means in the middle of the circulation path, so that the flow of the liquid is reduced. It can be stopped quickly, and the range in which the liquid spreads can be minimized.

Further, since the detection sensor is covered by the absorber that absorbs the liquid, the leaked liquid can be absorbed and held by the absorber, thereby preventing the spread of the liquid. In addition, even if the amount leaked is small,
The detection sensor easily comes into contact with the liquid via the absorber.
In other words, the entire surface of the absorber becomes a range in which the liquid can be detected, and the detection range becomes larger as compared with a case where only a linear sensor is used as a detection range as in the related art. Therefore, even if the amount of the leaked liquid is small, it is easily detected, and a user or the like can respond at an early stage of the leak. As a result, the spread of the liquid due to the leak can be suppressed as much as possible.

The electronic device, the liquid, and the absorber are the same as in the second aspect.

According to a fourth aspect of the present invention, in the cooling device for an electronic device according to the second or third aspect, the absorber is different from that before the contact by contacting the absorber with the liquid. It is characterized in that it contains a coloring agent that acts to make it look like a color.

According to the cooling device for an electronic device of the present invention, the absorber contains a colorant that comes into contact with the liquid and acts so that the absorber looks different from the color before contact. Therefore, if the liquid leaks, it can be visually confirmed, and the user can quickly respond, and the spread of the liquid due to the leak can be suppressed as much as possible.

According to a fifth aspect of the present invention, in the cooling device for an electronic device according to any one of the second to fourth aspects, the detection sensor may change the current value when the detection sensor comes into contact with the liquid. It is configured to detect the leakage of the liquid by causing an electrical change, and the liquid contains a conductive substance.

According to the cooling apparatus for an electronic device of the present invention, since the liquid contains a conductive substance, the conductivity of the liquid is improved, and the liquid is easily detected by the detection sensor. The liquid can be detected by the amount of leakage.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram schematically showing an example of a cooling device for an electronic device according to the present invention. In FIG. 1, 1
Is a cooling device, and 10 is an electronic device, and the same members as those in FIG. 5 are denoted by the same reference numerals. Further, a dotted line in FIG. 1 indicates a signal line through which signals are transmitted and received.

The electronic device 10 includes circuit boards 11 on which electronic circuits are mounted, and generates heat from the circuit boards 11 during operation and operation. The cooling device 1 receives the heat (waste heat) generated by the circuit boards 11, 11 through a liquid (hereinafter, referred to as a cooling liquid) and cools the circuit boards 11, 11.

The cooling device 1 includes heat exchangers 13, 13, a liquid tank 50, a circulation pump 40, a temperature measuring device 72, a radiator 30,
Control circuit 70, water circuit breaker 80, leak detection units 60, 60
Circulating paths 20a, 2a,
0b, 20c, and 20d are provided. The coolant circulates in a circulation path including these circulation paths 20a to 20d.

The heat exchangers 13 and 13 are branched from the coolant branch 12 connected to the circulation path 20d.
The coolant divided into two parts from the coolant branch 12 passes through the inside. The heat exchangers 13, 13 are formed in a spiral shape by using a material such as a metal that transfers heat, and are installed in contact with the circuit boards 11, 11, respectively. It is supposed to be. Thereby, the coolant flowing in the heat exchangers 13 and 13 is warmed. The cooling liquid collecting part 14 is a place where the cooling liquid flowing out of the heat exchangers 13 and 13 is collected into one, and the cooling liquid is circulated through the cooling liquid collecting part 14 to the circulation path 20a.
It is designed to flow out.

The liquid tank 50 is where the cooling liquid flowing in the electronic device 10 is temporarily stored. A circulating pump (pump) 40 is attached to the liquid tank 50, and under the control of the control circuit 70, pumps the cooling liquid in the liquid tank 50 and sends it out toward the temperature measuring device 72 at a predetermined pressure. It has become.

The temperature measuring device 72 is provided between the circulation path 20b and the circulation path 20c, measures the temperature of the coolant flowing from the circulation path 20b, and uses the information to control the control circuit 70.
To be sent to

The radiator 30 is provided with a radiating path 31 continuous from the circulation path 20c, and cooling fans 32,32. The heat radiating path 31 is a tube having a structure through which a cooling liquid flows so that the heat of the cooling liquid is easily released to the outside of the heat radiating path 31. It is formed in a shape that is repeatedly bent in a letter shape. The cooling fans 32, 32 further promote heat radiation of the coolant in the heat radiation path 31 and rapidly cool the coolant,
It operates appropriately and agitates the air in the radiator 30. The cooling fans 32, 32 are controlled by the control circuit 70, and the higher the temperature of the cooling liquid, the higher the number of rotations of the cooling fans 32, 32. When the cooling liquid falls below the set value, the cooling fans 32, 32 32 is designed to stop.

The water circuit breaker (circulation preventing means) 80 is provided in the middle of the circulation path 20d, and can close the circulation path 20d under the control of the control circuit 70 in order to stop the flow of the coolant. The alarm 73 is a siren, a buzzer, or the like for notifying the outside that the leakage of the cooling liquid or the like has occurred in the cooling device 1, and is configured to generate an alarm as appropriate under the control of the control circuit 70. .

The control circuit (control section) 70 controls the operation of the cooling device 1 and has a processing circuit and a memory area, and includes the cooling fans 32, 32, the circulating pump 40, the alarm 7
3. It is connected to a waterway breaker 80, a temperature measuring device 72, and a leak detection sensor 64 of each leak detection unit 60 described later. In the control circuit 70, an appropriate upper limit of the temperature of the coolant is set in advance, and when information on the current temperature of the coolant is sent from the temperature measuring device 72, the temperature is compared with the set value, If the temperature of the liquid is high, the cooling fans 32, 3
2 is driven at an appropriate rotation speed. According to the temperature information from the temperature measuring device 72, the cooling fans 32 are continuously driven until the temperature becomes equal to or less than the set value. Further, when the coolant leaks and a signal corresponding thereto is input from the leak detection sensor 64, the control circuit 70
Is stopped, and the flow path breaker 80 is driven to stop the flow of the coolant in the circulation path 20. On the other hand, the alarm 73 is caused to emit an alarm sound.

The leak detecting section 60 is appropriately mounted in the cooling device 1 at a position where the coolant is likely to leak.
FIG. 1 shows only those installed near the coolant collecting part 14 and near the circulation pump 40. FIG. 2 shows the leak detection unit 60 installed on the wall near the boundary between the coolant collecting unit 14 and the circulation path 20a. As shown in FIG. 2, the entirety of the leak detection unit 60 is formed in a plate shape, and is supported on the wall surface by a support member including a locking piece 90 and an engagement plate 91 so as not to come off the wall surface. I have.

FIG. 3 shows an example of the structure of the leak detecting section 60. The entire leak detection unit 60 is covered with a surface material 61,
The surface material 61 is made of a nonwoven fabric, such as polypropylene or polyester, that easily absorbs liquid. An absorption accelerator 62 made of linear pulp or absorbent paper is formed in a layer inside a surface material 61, and a liquid holding material 63 is formed in a central portion. As the liquid holding material 63, for example, an ionic synthetic polymer such as sodium polyacrylate is used. When sodium polyacrylate comes in contact with the water contained in the cooling liquid, the internal sodium ions jump out of the polymer network structure, the repulsion between the negative ions in the part where the sodium ions have escaped is strengthened, and the network becomes larger and larger. Water can be taken up and retained in the mesh.

Between the surface material 61 and the absorption accelerator 62, 2
There is provided a detection sensor 64 composed of two linear sensors. The detection sensor 64 is connected to the control circuit 70, and outputs a change in a small current flowing between the two linear sensors when coming into contact with the coolant as a leak detection signal to the control circuit 70. In the leak detection unit 60, when the surface material 61 comes into contact with the coolant, the coolant is instantaneously sucked. The coolant that has entered inside diffuses into the liquid holding material 63 through the absorption accelerator 62 and comes into contact with the detection sensor 64. That is, the surface material 61, the absorption accelerating material 62, and the liquid holding material 63 constitute the absorber of the present invention. Therefore, no matter which part of the surface material 61 contacts the coolant, the coolant reaches the detection sensor 64 and can be detected. In addition, there is an effect that the leak detector 64 can easily detect the sodium ions released from the liquid holding material 63.

Further, a water-soluble dye as a coloring agent is mixed in the absorption accelerating material 62 and the liquid holding material 63 of the leak detecting section 60. When this water-soluble dye comes into contact with water in the coolant, it reacts with or dissolves in the water, and as a result, a color different from that before the leak detection unit 60 comes into contact with the coolant. It is colored so that it can be seen. This makes it possible to visually recognize that the coolant has leaked.

The coolant flowing through the circulation paths 20a to 20d is pure or distilled water or an alcohol-based solvent. However, the coolant is made of a conductive material such that the conductivity of the coolant is increased and the coolant is easily detected by the detection sensor 64. Substances may be added as additives. Such additives include, for example, ionic compounds such as sodium chloride.

In the cooling device 1 having the above configuration,
The circuit boards 11, 11 are cooled as follows. Heat exchanger 1
The coolant, which has been heated by depriving the circuit boards 11 and 11 of heat through 3 and 13, flows through the circulation path 20 a via the coolant collecting part 14 and accumulates in the liquid tank 50. The coolant stored here flows through the circulation path 20c at a predetermined pressure via the circulation path 20b and the temperature measuring device 72 by the circulation pump 40. At this time, the temperature of the coolant is measured by the temperature measuring device 72, and the information is sent to the control circuit 70. If the temperature is higher than a preset temperature, for example, 36 degrees, the control circuit 70
Is rotationally driven at a predetermined rotational speed according to the temperature of the cooling liquid. The cooling liquid that has passed through the circulation path 20c flows through the heat radiation path 31 of the radiator 30, is cooled at that time, enters the cooling liquid branch portion 12 through the circulation path 20d, and is returned to the heat exchangers 13, 1 again.
Go through 3. Thus, the circuit board 1 of the electronic device 10
1 and 11 are maintained in a temperature range suitable for operation. If the temperature of the cooling liquid becomes equal to or lower than the set temperature by the measurement of the temperature measuring device 72, the cooling fans 32,
The operation of No. 2 stops.

The operation of the cooling device 1 when the coolant leaks will be described. Leak detection unit 6 in cooling device 1
When any one of the zeros sucks the leaked coolant, it spreads throughout the leak detection unit 60, and the detection sensor 64 and the coolant contact. As a result, the detection circuit 64 outputs the control circuit 7
For 0, a leak detection signal is output. Further, the leak detection unit 60 changes its color to a color different from the normal color due to the water-soluble dye. Next, the circulation pump 4 is controlled by the control circuit 70.
0 stops, and the cooling liquid is no longer delivered from the liquid tank 50 to the circulation path 20b. Further, while the circulation pump 40 is stopped, the water circuit breaker 80 shuts off the circulation path 20d and stops the flow of the coolant under the control of the control circuit 70. Further, at this time, an alarm is sounded by the alarm 73 to inform the user that the coolant has leaked.

According to the cooling device 1 described above, if the liquid leaks from the circulation path including the circulation paths 20a to 20d and is detected by any of the detection sensors 64,
Under the control of the control circuit 70 that has received the leak detection signal, the circulation pump 40 is stopped, and the flow of the coolant is stopped by the water channel breaker 80. Therefore, after the circulation pump 40 is stopped, even if the coolant continues to flow until the pressure in the circulation path is completely eliminated, the flow is stopped at the water circuit breaker 80, so that the flow is stopped quickly. The extent to which the coolant spreads can be minimized.

Further, since the leaked liquid is absorbed and held by the absorber composed of the surface material 61, the absorption accelerator 62, and the liquid holding material 63 of the leak detector 60, the spread of the liquid can be prevented. In addition, even if the amount of leakage is a small amount, the detection sensor 64 easily contacts the liquid via the absorber. In other words, the entire surface of the absorber becomes a range in which the liquid can be detected, and the detection range is larger than a conventional case where only the linear sensor is used as the detection range. Therefore, even if the leakage range of the liquid is small, it is easy to detect, and the user can respond promptly, so that the spread of the liquid due to the leakage can be suppressed as a result. Further, since the leak detection unit 60 is formed in a plate shape, it can be easily installed on a vertical surface as shown in FIG. In addition, since the cooling liquid flowing in the vertical plane in a streak shape can be reliably absorbed, the leak can be easily detected as compared with the conventional case where only two linear sensors are used.

Furthermore, since the absorption accelerator 62 and the liquid holding material 63 contain a water-soluble dye, if a liquid leaks, it can be visually confirmed, and the user can quickly respond. can do. Further, when a conductive substance is added to the cooling liquid, the conductivity of the liquid is improved, the liquid can be easily detected by the detection sensor 64, and the liquid can be detected with a smaller leakage amount.

The cooling device according to the present invention is not limited to the above-described embodiment.
The number of the water circuit breakers 80 may be appropriately set at a necessary place according to the flow rate of the coolant flowing in the circulation path and the specific structure of the circulation path. For example, the leak detection unit 60
As shown in FIG. 4, it may be installed near the joint between the heat radiating unit 30 and the circulation path 20. Since a relatively large amount of coolant leaks into such a portion, the tub 6
A device that receives the leaked coolant such as 5 may be installed. By installing the leak detecting section 60 in the tub 65, the leak is detected and the coolant leaked from the joint portion is absorbed by the absorber, so that the coolant does not spread to other places.

Further, since the leak detecting portion is formed of a nonwoven fabric, a linear pulp or the like, the leak detecting portion is not only formed in a plate shape as in the above embodiment, but also has an L-shaped or U-shaped cross section.
It can be installed irrespective of a place or a member to be attached, such as being formed as a donut type and being installed on a stepped wall surface or being directly wound around a pipe such as a circulation path.

Further, the cooling fan 3 in the cooling device 1
2, 32, circulation pump 40, alarm 73, water circuit breaker 8
Although 0 is controlled by the control circuit 70, in addition to this, it may be configured such that it can be manually operated in an emergency.

[0042]

According to the first aspect of the present invention, if the liquid leaks from the circulation path, the pump can be stopped and the flow of the liquid can be stopped by the circulation prevention means. Therefore, even after the pump is stopped, even if the liquid continues to flow until the pressure in the circulation path is completely eliminated, the flow is stopped at the circulation preventing means in the middle of the circulation path, so that the flow of the liquid is reduced. It can be stopped quickly, and the range in which the liquid spreads can be minimized.

According to the second aspect of the present invention, the leaked liquid is absorbed and held by the absorber, so that the spread of the liquid can be prevented. In addition, even if the leaked amount is a small amount, the detection sensor easily contacts the liquid via the absorber. In other words, the entire surface of the absorber becomes a range in which the liquid can be detected, and the detection range becomes larger as compared with a case where only a linear sensor is used as a detection range as in the related art. Therefore, even if the amount of the leaked liquid is small, it is easily detected, and a user or the like can respond at an early stage of the leak. As a result, the spread of the liquid due to the leak can be suppressed as much as possible.

According to the third aspect of the invention,
When the liquid leaks from the circulation path and is detected by the detection sensor, under the control of the control circuit that receives the leak detection signal,
When the pump stops, the flow of the liquid is stopped by the circulation preventing means. Therefore, even after the pump is stopped, even if the liquid continues to flow until the pressure in the circulation path is completely eliminated, the flow is stopped at the circulation preventing means in the middle of the circulation path, so that the flow of the liquid is reduced. It can be stopped quickly, and the range in which the liquid spreads can be minimized. In addition, since the detection sensor is covered by the absorber that absorbs the liquid, the leaked liquid can be absorbed and held by the absorber to prevent the spread of the liquid. In addition, even if the leaked amount is a small amount, the detection sensor easily contacts the liquid via the absorber. In other words, the entire surface of the absorber becomes a range in which the liquid can be detected, and the detection range becomes larger as compared with a case where only a linear sensor is used as a detection range as in the related art. Therefore, even if the range of leakage of the liquid is small, the leakage is easily detected, and the user or the like can deal with the leakage of the liquid at a small point in time. As a result,
Spreading of the liquid due to leakage can be minimized.

According to the invention described in claim 4, according to claim 2
Or, in addition to the effect of the invention described in 3 above, when a liquid leaks, it can be visually confirmed, and a user or the like can quickly respond, and the spread of the liquid due to the leak can be suppressed as much as possible. .

According to the invention set forth in claim 5, claim 2 is provided.
In addition to the effects of the invention described in any one of (1) to (4), the conductivity of the liquid is improved, the liquid is easily detected by the detection sensor, and the liquid can be detected with a smaller leakage amount.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically illustrating a configuration of a cooling device that cools an electronic device as an example of the present invention.

FIG. 2 is a perspective view showing a state in which a leak detection unit is installed in the cooling device for the electronic device of FIG. 1;

FIG. 3 is a cross-sectional view of the leak detection unit of FIG.

FIG. 4 is a schematic diagram showing a state where a leak detection unit of the present invention is installed.

FIG. 5 is a configuration diagram schematically showing a configuration of a conventional cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling device 10 Electronic device 11, 11 Circuit board 12 Cooling water branch part 13, 13 Heat exchanger 14 Cooling water collecting part 20a, 20b, 20c, 20d Circulation path 30 Heat radiating part 31 Heat radiating path 32, 32 Cooling fan 40 Circulating pump (Pump) 50 Liquid tank 60 Leak detection unit 61 Surface material 62 Absorption accelerating material 63 Liquid holding material 64 Detection sensor 65 Tub 70 Control circuit (Control unit) 72 Temperature measuring device 73 Alarm device 80 Water circuit breaker (circulation prevention means)

Claims (5)

[Claims] 1. A circulation path through which a liquid circulates, and a pump for sending out the liquid so that the liquid circulates through the circulation path, wherein the electronic device is cooled by using the liquid circulating through the circulation path as a medium. A cooling device for an electronic device, further comprising: a circulation prevention unit that is located in the middle of the circulation path and that can stop the flow of the liquid. 2. An electronic apparatus comprising: a circulation path through which a liquid circulates; and a detection sensor capable of detecting leakage of the liquid from the circulation path, and cooling the electronic device using the liquid circulating through the circulation path as a medium. A cooling device for an electronic device, wherein the detection sensor is covered by an absorber that absorbs the liquid. 3. A circulation path through which the liquid circulates, a pump for sending out the liquid so that the liquid circulates through the circulation path, and a flow of the liquid in the middle of the circulation path can be stopped. A circulation sensor; a detection sensor capable of detecting leakage of the liquid from the circulation path; and a control unit for controlling the pump and the circulation prevention means. As a medium, a cooling device that cools an electronic device, wherein the detection sensor is covered with an absorber that absorbs the liquid, and outputs a leak detection signal to the control unit when detecting the liquid, The control unit, when the leak detection signal is input, stops the pump and controls the circulation prevention unit to a state where the flow of liquid is stopped. . 4. A colorant, wherein the absorber contains a colorant that comes into contact with the liquid so that the absorber looks like a different color from before the contact. 4. The cooling device for an electronic device according to 2 or 3. 5. The detection sensor is configured to detect leakage of the liquid by causing an electrical change such as a change in a current value when the detection sensor comes into contact with the liquid, The cooling device for an electronic device according to any one of claims 2 to 4, wherein the device contains a conductive substance.