JP2019016764A - Liquid immersion cooling device and information processing device - Google Patents

Abstract

To provide a liquid immersion cooling device which inhibits reduction of a refrigerant liquid in the liquid immersion cooling device having a liquid immersion tank, and to provide an information processing device.SOLUTION: A liquid immersion cooling device A1 includes a liquid immersion tank 10, a refrigerant liquid 30 and multiple fillers 40. The refrigerant liquid 30 is stored in the liquid immersion tank 10. The fillers 40 fill the liquid immersion tank 10, float on a surface of the refrigerant liquid 30, and cover the surface of the refrigerant liquid 30. The liquid immersion tank 10 has: a sealed first tank 11 having a top wall 15; a second tank 12 provided adjacent to the lateral side of the first tank 11; a sealed gas space 13 which connects a liquid surface of the refrigerant liquid 30 in the first tank 11 with a first area 34 of the liquid surface of the refrigerant liquid 30 in the second tank 12; and an open port 14 which opens a second area 35 of the liquid surface of the refrigerant liquid 30 in the second tank 12 to an atmospheric space. The fillers 40 float on the second area 35 and cover the second area 35.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in the present application relates to an immersion cooling apparatus and an information processing apparatus.

  As an apparatus for cooling an electronic apparatus, an immersion cooling apparatus that cools an electronic apparatus by immersing the electronic apparatus in a refrigerant liquid stored in an immersion tank has been proposed. The immersion cooling apparatus includes an immersion cooling apparatus having an open type immersion tank that opens upward (see, for example, Patent Document 1), and an immersion cooling apparatus having a sealed immersion tank having a ceiling wall. (See, for example, Patent Document 2).

International Publication No. 2016/117098 Pamphlet JP 2007-167517 A JP-A-60-81848 JP 7-115155 A Japanese Utility Model Publication No. 59-42047

  In an immersion cooling apparatus having an open type immersion tank, the immersion tank opens upward, so that the refrigerant liquid always evaporates and decreases. On the other hand, in an immersion cooling apparatus having a sealed immersion tank, the immersion tank is sealed, so that it is possible to suppress the refrigerant liquid from constantly evaporating and decreasing.

  However, in an immersion cooling apparatus having a sealed immersion tank, a pressure adjustment valve may be provided in the immersion tank in order to suppress an excessive increase in the internal pressure of the immersion tank. When the pressure adjusting valve is provided in the liquid immersion tank, the vapor of the refrigerant liquid is released when the pressure adjusting valve is opened. Therefore, there is a possibility that the refrigerant liquid is reduced even in the immersion cooling apparatus having the sealed immersion tank.

  The technique which this application discloses aims at suppressing the fall of a refrigerant liquid as one side.

  An immersion cooling device according to one aspect of the technology disclosed in the present application includes an immersion tank, a refrigerant liquid stored in the immersion tank, and the immersion tank is filled and floated on a surface of the refrigerant liquid. And a plurality of fillers covering the surface of the refrigerant liquid.

  According to one aspect of the technology disclosed in the present application, it is possible to suppress a decrease in the refrigerant liquid.

It is a figure which shows the immersion cooling device which concerns on 1st embodiment. It is a figure which shows the immersion cooling device which concerns on 2nd embodiment. It is a figure which shows the immersion cooling device which concerns on 3rd embodiment. It is a figure which shows the immersion cooling device which concerns on 4th embodiment. It is a figure which shows the immersion cooling device which concerns on 5th embodiment. It is a figure which shows the immersion cooling device which concerns on 6th embodiment. It is a figure which shows the immersion cooling device which concerns on 7th embodiment. It is a figure which shows the immersion cooling device which concerns on 8th embodiment. It is a figure which shows the immersion cooling device which concerns on 9th embodiment. It is a figure which shows the immersion cooling device which concerns on 10th embodiment.

[First embodiment]
First, a first embodiment of the technology disclosed in the present application will be described.

  An immersion cooling apparatus A1 according to the first embodiment shown in FIG. 1 is for cooling an electronic device 70 by immersing it in a refrigerant liquid 30. The immersion tank 10, the refrigerant liquid 30, and a plurality of fillers 40 and a circulation mechanism 50.

  The immersion tank 10 has a first tank 11, a second tank 12, a gas space 13, and an open port 14. The first tank 11 is a sealed type having a ceiling wall 15 and is formed in a sealed box shape. The second tank 12 is smaller than the first tank 11 and is provided adjacent to the side of the first tank 11.

  The second tank 12 has an upper wall 16, a lower wall 17, and a partition wall 18. The upper wall 16 is formed by extending the top wall 15 of the first tank 11, and is provided on the side of the top wall 15. The lower wall 17 is opposed to the upper wall 16 in the vertical direction, and the partition wall 18 extends from the distal end portion in the extending direction of the upper wall 16 toward the lower wall 17 (downward). The partition wall 18 is inserted inside the second tank 12. A partition wall 19 is provided between the first tank 11 and the second tank 12, and a gas passage 20 is provided between the partition wall 19 and the upper wall 16. A refrigerant liquid passage 21 is provided between the lower wall 17 and the partition wall 18.

  The partition wall 18 and the partition wall 19 face each other in the horizontal direction, and the upper end portion of the partition wall 19 is located above the lower end portion of the partition wall 18. A portion above the refrigerant liquid passage 21 in the partition wall 19 and a portion below the gas passage 20 in the partition wall 18 overlap in the vertical direction.

  For the refrigerant liquid 30 stored in the immersion tank 10, for example, a fluorine-based inert liquid or oil is used as a liquid having insulating properties and high cooling efficiency. In particular, the fluorinated inert liquid is effective because of its high cooling efficiency. Specifically, the refrigerant liquid 30 is stored in the first tank 11 and the second tank 12. The height of the liquid surface of the refrigerant liquid 30 is set at a position lower than the upper end portion of the partition wall 19, and the upper end portion of the partition wall 19 protrudes from the liquid surface of the refrigerant liquid 30.

  The first tank 11 and the second tank 12 are separated by a partition wall 19, and the refrigerant liquid 30 stored in the immersion tank 10 includes the first refrigerant liquid 31 stored in the first tank 11 and the second tank. 12 and the second refrigerant liquid 32 stored in 12. The first refrigerant liquid 31 and the second refrigerant liquid 32 are the same liquid. For example, the liquid level of the first refrigerant liquid 31 and the liquid level of the second refrigerant liquid 32 are set to the same height, but may be set to different heights.

  Hereinafter, in the case where the first refrigerant liquid 31 stored in the first tank 11 and the second refrigerant liquid 32 stored in the second tank 12 are not distinguished, the first refrigerant liquid 31 and the second refrigerant liquid are used. 32 are collectively referred to as a refrigerant liquid 30.

  A gas space 13 is formed between the top wall 15 and the upper wall 16 and the liquid surface of the refrigerant liquid 30. The gas space 13 is sealed by being surrounded by the side wall 23 facing the partition wall 19 in the first tank 11, the ceiling walls 15 and 16, the partition wall 18, and the liquid surface of the refrigerant liquid 30. The gas passage 20 is positioned in the gas space 13 by setting the height of the liquid surface of the refrigerant liquid 30 to be lower than the upper end of the partition wall 19. The gas space 13 is formed through the gas passage 20, and the gas in the gas space 13 flows through the gas passage 20. The gas in the gas space 13 includes the vapor 33 of the first refrigerant liquid 31.

  The liquid surface of the first refrigerant liquid 31 and the first region 34 of the liquid surface of the second refrigerant liquid 32 are connected by the gas space 13. More specifically, the first region 34 corresponds to the liquid level of the second refrigerant liquid 32 between the partition wall 19 and the partition wall 18. The liquid level of the first refrigerant liquid 31 is an example of “the liquid level of the refrigerant liquid in the first tank”, and the liquid level of the second refrigerant liquid 32 is an example of “the liquid level of the refrigerant liquid in the second tank”. is there.

  The lower end portion of the partition wall 18 is at a position lower than the liquid level of the second refrigerant liquid 32, whereby the refrigerant liquid passage 21 is located in the second refrigerant liquid 32. In the second tank 12, the second refrigerant liquid 32 flows through the refrigerant liquid passage 21. In the second tank 12, a side wall 24 facing the partition wall 19 is formed. An opening 14 is formed on the opposite side of the partition wall 18 in the second tank 12 from the partition wall 19 and between the side wall 24 and the partition wall 18 in the second tank 12.

  The second area 35 on the liquid surface of the second refrigerant liquid 32 is opened to the atmospheric space 60 through the opening 14. More specifically, the second region 35 corresponds to the liquid level of the second refrigerant liquid 32 between the side wall 24 and the partition wall 18. The second area 35 corresponds to the remaining area of the liquid surface of the second refrigerant liquid 32 excluding the first area 34.

  The distance between the side wall 24 and the partition wall 18 in the second tank 12 (the width of the opening 14) is narrower than the distance between the side wall 23 and the partition wall 19 in the first tank 11. Thereby, the surface area of the second region 35 is smaller than the surface area of the liquid surface of the first refrigerant liquid 31.

  The plurality of fillers 40 (covering materials) are formed separately (independently) from each other. The plurality of fillers 40 are, for example, resin foam materials mainly made of polystyrene resin, and are filled in the opening 14 of the immersion tank 10. The plurality of fillers 40 have a density lower than that of the refrigerant liquid 30 and float on the second region 35 to cover the second region 35. Each of the plurality of fillers 40 is hardly absorbable with respect to the refrigerant liquid 30. The shape of the plurality of fillers 40 may be any shape, for example, a spherical shape, an elliptical spherical shape, an S-shape, or the like.

  The electronic device 70 is accommodated in the first tank 11 and immersed in the first refrigerant liquid 31. The cable 71 extending from the electronic device 70 is led out to the outside of the immersion tank 10 (atmospheric space 60) through the open port 14, for example. In the opening 14, the plurality of fillers 40 are arranged avoiding the cables 71. When the plurality of fillers 40 are arranged avoiding the cables 71, it is desirable that the fillers 40 be formed in an appropriate size so that there is no gap between them.

  The above-described immersion cooling apparatus A1 forms an information processing apparatus 80 with the electronic device 70. For example, the top wall 15 of the first tank 11 is a lid, and the electronic apparatus 70 can be accommodated in the first tank 11 by opening the top wall 15.

  The circulation mechanism 50 includes a suction pipe 51, a supply pipe 52, a pump 53, and a refrigerator 54. The suction pipe 51 and the supply pipe 52 are connected to the side wall 23 and the partition wall 19 of the first tank 11, respectively.

  The circulation mechanism 50 has a function of circulating the first refrigerant liquid 31 between the first tank 11 and cooling the first refrigerant liquid 31. That is, in this circulation mechanism 50, when the pump 53 is operated, the first refrigerant liquid 31 is carried to the refrigerator 54 through the suction pipe 51 and the pump 53, and the first refrigerant liquid 31 cooled by the refrigerator 54 is supplied to the supply pipe. 52 is returned to the first tank 11.

  Then, the effect | action and effect of 1st embodiment are demonstrated.

  In the immersion cooling apparatus A1 according to the first embodiment, the first tank 11 in which the electronic device 70 is immersed and cooled in the first refrigerant liquid 31 is a sealed type. Therefore, it is possible to suppress the first refrigerant liquid 31 from constantly evaporating and decreasing as in the case of the open type.

  A second tank 12 is provided adjacent to the side of the sealed first tank 11. The liquid level of the first refrigerant liquid 31 in the first tank 11 and the first region 34 of the liquid level of the second refrigerant liquid 32 in the second tank 12 are connected by a sealed gas space 13. Therefore, for example, even if the volume of the gas space 13 is increased by the vapor 33 generated from the first refrigerant liquid 31, the position of the first region 34 is lowered by pressing the first region 34 by the gas space 13. Thereby, since the internal pressure of the first tank 11 becomes substantially the same as the pressure of the atmospheric space 60, the vapor 33 of the first refrigerant liquid 31 flows out to the outside through a gap between the walls in the first tank 11, for example. Can be suppressed. As a result, the decrease in the refrigerant liquid 30 can be suppressed.

  Further, the gas space 13 that connects the liquid surface of the first refrigerant liquid 31 and the first region 34 of the liquid surface of the second refrigerant liquid 32 is sealed. For this reason, even if the first refrigerant liquid 31 evaporates, the vapor 33 of the first refrigerant liquid 31 is suppressed from flowing out of the gas space 13. Therefore, the decrease in the refrigerant liquid 30 can also be suppressed by this.

  In addition, the distance between the side wall 24 and the partition wall 18 in the second tank 12 (the width of the opening 14) is narrower than the distance between the side wall 23 and the partition wall 19 in the first tank 11. Thereby, the surface area of the second region 35 is smaller than the surface area of the liquid surface of the first refrigerant liquid 31. Therefore, the evaporation of the second refrigerant liquid 32 can be suppressed by the amount that the surface area of the second region 35 opened to the atmospheric space 60 is reduced, and consequently the decrease of the refrigerant liquid 30 can be suppressed.

  The second area 35 on the liquid surface of the second refrigerant liquid 32 is opened to the atmospheric space 60 through the opening 14. Here, the opening 14 is filled with a plurality of fillers 40, and the plurality of fillers 40 floats in the second region 35 and covers the second region 35. Therefore, since the exposure of the second region 35 can be suppressed, the second refrigerant liquid 32 can be suppressed from evaporating in the second region 35.

  Thus, according to the immersion cooling device A1 according to the first embodiment, evaporation of the refrigerant liquid 30 that is generally expensive can be suppressed. Thereby, since the frequency | count of the replenishment of the refrigerant | coolant liquid 30 and the maintenance for it can be reduced, the running cost of the information processing apparatus 80 can be suppressed.

  Moreover, even if the volume of the gas space 13 increases due to the vapor 33 generated from the first refrigerant liquid 31, the excessive increase in the internal pressure of the first tank 11 is suppressed by lowering the position of the first region 34. Can do. Thereby, since a pressure control valve can be made unnecessary, the initial cost of the information processing apparatus 80 can be suppressed.

  Further, as described above, the distance between the side wall 24 and the partition wall 18 in the second tank 12 (the width of the opening 14) is narrower than the distance between the side wall 23 and the partition wall 19 in the first tank 11. It has become. Thereby, the surface area of the second region 35 is smaller than the surface area of the liquid surface of the first refrigerant liquid 31. Therefore, for example, compared with the case where the liquid level of the first refrigerant liquid 31 is covered with the plurality of fillers 40, the amount of use of the plurality of fillers 40 can be reduced. The initial cost can be suppressed.

  The immersion tank 10 has a simple structure in which a second tank 12 having an upper wall 16, a lower wall 17, and a partition wall 18 is provided adjacent to the side of the first tank 11. Therefore, the manufacturing cost of the immersion tank 10 and the initial cost of the information processing apparatus 80 can be suppressed.

  A circulation mechanism 50 that circulates the refrigerant liquid 30 is connected to the first tank 11. Therefore, the refrigerant liquid 30 is not between the second tank 12 provided with the plurality of fillers 40 and the circulation mechanism 50 but between the first tank 11 and the circulation mechanism 50 where the plurality of fillers 40 are not provided. Circulate between. Thereby, it is possible to prevent the filler 40 from being sucked into the circulation mechanism 50 and causing problems such as clogging in the circulation mechanism 50.

  The refrigerant liquid 30 has a first refrigerant liquid 31 stored in the first tank 11 and a second refrigerant liquid 32 stored in the second tank 12. The first refrigerant liquid 31 and the second refrigerant liquid 32 are the same liquid. Therefore, as compared with the case where different liquids are used for the first refrigerant liquid 31 and the second refrigerant liquid 32, the set-up property and the maintainability can be improved.

[Second Embodiment]
Next, a second embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A2 according to the second embodiment shown in FIG. 2 is changed in configuration as follows with respect to the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above. That is, the plurality of fillers 40 filled in the opening 14 of the liquid immersion tank 10 are stacked in two layers.

  In this way, since the sealing performance of the plurality of fillers 40 is improved, the evaporation of the second refrigerant liquid 32 in the second region 35 can be further effectively suppressed.

  Note that the plurality of fillers 40 filled in the opening 14 of the immersion tank 10 may be stacked in three or more layers.

[Third embodiment]
Next, a third embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A3 according to the third embodiment shown in FIG. 3 has a configuration changed as follows with respect to the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above.

  That is, the second region 35 is covered with the evaporation suppression liquid 90 that suppresses the evaporation of the second refrigerant liquid 32. As the evaporation suppression liquid 90, a liquid having a density lower than that of the refrigerant liquid 30 and higher than that of the filler 40 is used. As such an evaporation suppression liquid 90, for example, silicon oil is used. The plurality of fillers 40 are floated on the second region 35 via the evaporation suppression liquid 90.

  In this way, since the sealing performance with respect to the second region 35 is improved, evaporation of the second refrigerant liquid 32 in the second region 35 can be further effectively suppressed.

  Note that, as in the second embodiment described above, the plurality of fillers 40 may be stacked in layers on the evaporation suppression liquid 90. In this way, the sealing performance with respect to the second region 35 can be further improved.

[Fourth embodiment]
Next, a fourth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A4 according to the fourth embodiment shown in FIG. 4 is changed in configuration as follows with respect to the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above.

  That is, the upper end of the partition wall 18 and the upper end of the side wall 24 in the second tank 12 are connected by the upper wall 26. The opening 14 is formed in the upper part of the side wall 24 and opens to the side of the second tank 12. The opening 14 is formed at a position lower than the gas passage 20. In the second tank 12 having the opening 14, a plurality of fillers 40 are floated in the first region 34 in contact with the gas space 13 in addition to the second region 35 in contact with the atmospheric space 60 through the opening 14. Yes. The plurality of fillers 40 cover the first region 34. Note that the cable 71 extending from the electronic device 70 is omitted in the following description and drawings.

  By the way, in the immersion cooling device A4 according to the fourth embodiment, since the second region 35 is in contact with the atmospheric space 60, even if the second region 35 is covered with a plurality of fillers 40, The two refrigerant liquids 32 are slightly evaporated. And if the 2nd refrigerant | coolant liquid 32 continues evaporating and the height of the 2nd area | region 35 falls below the lower end part of the partition wall 18, the 1st tank 11 will be open | released by the atmospheric space 60, and the airtightness of the 1st tank 11 will be carried out. There is a risk that the vapor 33 of the first refrigerant liquid 31 may be released to the atmospheric space 60 through the opening 14.

  Therefore, in order to prevent the vapor 33 of the first refrigerant liquid 31 from being released into the atmospheric space 60, the immersion cooling device A4 according to the fourth embodiment includes a suction tube 110, a discharge tube 111, a liquid level. A switch 114, a pump 116, and a control unit 118 are provided.

  The suction tube 110 is inserted from the first tank 11 through the gas passage 20 into the first chamber 27 between the partition wall 19 and the partition wall 18 and from the first chamber 27 through the refrigerant liquid passage 21 to the partition wall 18 and the side wall 24. Is inserted into the second chamber 28 between the two. One end 110 </ b> A of the suction tube 110 is immersed in the first refrigerant liquid 31.

  The discharge tube 111 is disposed in the second chamber 28. One end 112 </ b> A of the discharge tube 111 is located above the second region 35 and above the opening 14. One end 112 </ b> A of the discharge tube 111 is positioned above the liquid surface of the first refrigerant liquid 31 in order to prevent the refrigerant liquid 30 from continuing to be discharged due to the siphon principle.

  The liquid level switch 114 is provided in the second chamber 28 and is fixed to the partition wall 18. The liquid level switch 114 is disposed above the lower end portion of the partition wall 18 and detects that the height of the second region 35 has been lowered to a predetermined position. This predetermined position corresponds to the height at which the liquid level switch 114 is disposed, and is below the opening 14 and above the lower end of the partition wall 18.

  Similarly to the liquid level switch 114, the pump 116 is provided in the second chamber 28 and is fixed to the partition wall 18. The pump 116 is connected to the other end of the suction tube 110 and the other end of the discharge tube 111. The pump 116 operates to send the refrigerant liquid 30 from the suction tube 110 to the discharge tube 111. An open type in which the suction port and the discharge port are always in communication is applied to the pump 116.

  The control unit 118 is, for example, a circuit board having an arithmetic device and a storage device. The control unit 118 is electrically connected to the liquid level switch 114 and the pump 116, and operates and stops the pump 116 based on the detection signal of the liquid level switch 114.

  In the immersion cooling device A4 according to the fourth embodiment, when the liquid level switch 114 detects that the height of the second region 35 has decreased to a predetermined position, the controller 118 The pump 116 is operated by being controlled by. Thereby, the refrigerant liquid 30 is sent from the suction tube 110 to the discharge tube 111 through the pump 116, and the refrigerant liquid 30 is supplied from the first tank 11 to the second chamber 28 of the second tank 12.

  As a result, even if the second refrigerant liquid 32 continues to evaporate in the second region 35, it can be avoided that the height of the second region 35 falls below the lower end portion of the partition wall 18. Therefore, since the airtightness of the first tank 11 is maintained, it is possible to prevent the vapor 33 of the first refrigerant liquid 31 from being released to the atmospheric space 60 through the opening 14. The pump 116 is stopped at the timing when the height of the second region 35 is increased to the specified height.

[Fifth embodiment]
Next, a fifth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A5 according to the fifth embodiment shown in FIG. 5 is configured as follows with respect to the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above.

  That is, the upper end portion of the partition wall 18 and the upper end portion of the side wall 24 in the second tank 12 are connected by the upper wall 16. The opening 14 is formed in the upper part of the side wall 24 and opens to the side of the second tank 12. In the second tank 12 having the opening 14, a plurality of fillers 40 are floated in the first region 34 in contact with the gas space 13 in addition to the second region 35 in contact with the atmospheric space 60 through the opening 14. Yes. The plurality of fillers 40 cover the first region 34.

  By the way, in the immersion cooling device A5 according to the fifth embodiment, when the vapor 33 of the first refrigerant liquid 31 comes into contact with the first region 34, the refrigerant liquid 30 condenses in the second tank 12. Thus, if the condensation of the refrigerant liquid 30 continues in the second tank 12, the liquid level of the second refrigerant liquid 32 (the height of the second region 35) rises and the refrigerant liquid 30 may overflow from the opening 14. There is.

  Therefore, in order to prevent the refrigerant liquid 30 from overflowing from the open port 14, in the immersion cooling device A5 according to the fifth embodiment, the second tank 12 having the upper wall 16 and the lower wall 17 is provided as the first tank. 11 is provided at a generally high position. That is, the upper wall 16 of the second tank 12 is located above the top wall 15 of the first tank 11, and the lower wall 17 of the second tank 12 is located above the bottom wall 29 of the first tank 11. To do. Further, the opening 14 is located higher than the gas passage 20.

  In the immersion cooling device A5 according to the fifth embodiment, the second tank 12 is provided at a position that is generally higher than the first tank 11, and the opening 14 is at a position higher than the gas passage 20. Therefore, even if the liquid level of the second refrigerant liquid 32 rises, the refrigerant liquid 30 is transferred from the second tank 12 to the first tank 11 through the gas passage 20 while preventing the refrigerant liquid 30 from overflowing from the opening 14. Can supply. Thereby, it is possible to prevent the refrigerant liquid 30 from overflowing from the opening 14 and to keep the liquid levels of the first refrigerant liquid 31 and the second refrigerant liquid 32 constant.

[Sixth embodiment]
Next, a sixth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A6 according to the sixth embodiment shown in FIG. 6 is a first tank 11 and a second tank 12 having the same structure as the immersion cooling apparatus A4 (see FIG. 4) according to the fourth embodiment described above. Have In the first tank 11 and the second tank 12, the opening 14 is formed at a position lower than the gas passage 20.

  By the way, in the immersion tank 10 having the first tank 11 and the second tank 12 having such a structure, when the vapor 33 of the first refrigerant liquid 31 comes into contact with the first region 34, the refrigerant liquid 30 in the second tank 12. Condenses. Thus, if the condensation of the refrigerant liquid 30 continues in the second tank 12, the liquid level of the second refrigerant liquid 32 (the height of the second region 35) rises and the refrigerant liquid 30 may overflow from the opening 14. There is. In particular, since the opening 14 is formed at a position lower than the gas passage 20, the refrigerant liquid 30 extends from the opening 14 compared to the case where the opening 14 is formed at a position higher than the gas passage 20. It is easy to overflow.

  Therefore, in order to prevent the refrigerant liquid 30 from overflowing from the opening 14, in the immersion cooling device A <b> 6 according to the sixth embodiment, the suction tube 112, the discharge tube 113, the liquid level switch 115, and the pump 117. And a control unit 118.

  The suction tube 112 is disposed in the second chamber 28. One end 112 </ b> A of the suction tube 112 is immersed in the second refrigerant liquid 32.

  The discharge tube 113 is inserted into the first chamber 27 between the partition wall 19 and the partition wall 18 from the first tank 11 through the gas passage 20 and from the first chamber 27 through the refrigerant liquid passage 21 to the partition wall 18 and the side wall 24. Is inserted into the second chamber 28 between the two. One end 113 </ b> A of the discharge tube 113 is located above the liquid level of the first refrigerant liquid 31. One end 113 </ b> A of the discharge tube 113 is positioned above the liquid level of the first refrigerant liquid 31 in order to prevent the refrigerant liquid 30 from continuing to be discharged due to the siphon principle.

  The liquid level switch 115 is provided in the second chamber 28 and is fixed to the partition wall 18. The liquid level switch 115 is arranged above the lower end of the partition wall 18 and detects that the height of the second region 35 has risen to a predetermined position. This predetermined position corresponds to the height at which the liquid level switch 115 is disposed, and is below the opening 14 and above the lower end of the partition wall 18.

  As with the liquid level switch 115, the pump 117 is provided in the second chamber 28 and is fixed to the partition wall 18. The pump 117 is connected to the other end of the suction tube 112 and the other end of the discharge tube 113. The pump 117 operates to send the refrigerant liquid 30 from the suction tube 112 to the discharge tube 113. An open type in which the suction port and the discharge port are always in communication is applied to the pump 117.

  The control unit 118 is, for example, a circuit board having an arithmetic device and a storage device. The control unit 118 is electrically connected to the liquid level switch 115 and the pump 117, and operates and stops the pump 117 based on the detection signal of the liquid level switch 115.

  In the immersion cooling device A6 according to the sixth embodiment, when the liquid level switch 115 detects that the height of the second region 35 has risen to a predetermined position, the controller 118 The pump 117 is operated by being controlled by. Thereby, the refrigerant liquid 30 is sent from the suction tube 112 to the discharge tube 113 through the pump 117, and the refrigerant liquid 30 is supplied from the second chamber 28 of the second tank 12 to the first tank 11. Thereby, the refrigerant liquid 30 can be prevented from overflowing from the opening 14. As a result, the liquid levels of the first refrigerant liquid 31 and the second refrigerant liquid 32 can be kept constant. The pump 117 is stopped at the timing when the height of the second region 35 is reduced to the specified height.

[Seventh embodiment]
Next, a seventh embodiment of the technology disclosed in the present application will be described.

  The immersion cooling apparatus A7 according to the seventh embodiment shown in FIG. 7 includes the immersion cooling apparatus A4 (see FIG. 4) according to the above-described fourth embodiment and the immersion cooling apparatus according to the above-described sixth embodiment. A6 (see FIG. 6) is combined.

  That is, the liquid immersion cooling device A7 according to the seventh embodiment includes a suction tube 110, a discharge tube 111, a suction tube 112, a discharge tube 113, a liquid level switch 114, a liquid level switch 115, and a pump 116. The pump 117 and the control unit 118 are provided.

  The suction tube 110 and the discharge tube 111 are examples of “first suction tube” and “first discharge tube”, and the suction tube 112 and the discharge tube 113 are “second suction tube” and “second discharge tube”. It is an example. Furthermore, the liquid level switch 114 and the liquid level switch 115 are examples of “first liquid level switch” and “second liquid level switch”, and the pump 116 and the pump 117 are “first pump” and “second pump”. Is an example.

  The suction tube 110 is inserted from the first tank 11 through the gas passage 20 into the first chamber 27 between the partition wall 19 and the partition wall 18 and from the first chamber 27 through the refrigerant liquid passage 21 to the partition wall 18 and the side wall 24. Is inserted into the second chamber 28 between the two. One end 110 </ b> A of the suction tube 110 is immersed in the first refrigerant liquid 31.

  The discharge tube 111 is disposed in the second chamber 28. One end 111 </ b> A of the discharge tube 111 is located above the second region 35 and above the opening 14. One end 111 </ b> A of the discharge tube 111 is located above the liquid surface of the first refrigerant liquid 31 in order to prevent the refrigerant liquid 30 from continuing to be discharged due to the siphon principle.

  The suction tube 112 is disposed in the second chamber 28. One end 112 </ b> A of the suction tube 112 is immersed in the second refrigerant liquid 32.

  The discharge tube 113 is inserted into the first chamber 27 between the partition wall 19 and the partition wall 18 from the first tank 11 through the gas passage 20 and from the first chamber 27 through the refrigerant liquid passage 21 to the partition wall 18 and the side wall 24. Is inserted into the second chamber 28 between the two. One end 113 </ b> A of the discharge tube 113 is located above the liquid level of the first refrigerant liquid 31. One end 113 </ b> A of the discharge tube 113 is positioned above the liquid level of the first refrigerant liquid 31 in order to prevent the refrigerant liquid 30 from continuing to be discharged due to the siphon principle.

  The liquid level switch 114 is provided in the second chamber 28 and is fixed to the partition wall 18. The liquid level switch 114 is disposed above the lower end portion of the partition wall 18 and detects that the height of the second region 35 has been lowered to a predetermined position. This predetermined position corresponds to the height at which the liquid level switch 114 is disposed, and is below the opening 14 and above the lower end of the partition wall 18.

  The liquid level switch 115 is provided in the second chamber 28 and is fixed to the partition wall 18. The liquid level switch 115 is arranged above the lower end of the partition wall 18 and detects that the height of the second region 35 has risen to a predetermined position. This predetermined position corresponds to the height at which the liquid level switch 115 is disposed, is below the opening 14 and above the lower end of the partition wall 18, and is higher than the liquid level switch 114. It is the upper side.

  The pump 116 is provided in the second chamber 28. The pump 116 is connected to the other end of the suction tube 110 and the other end of the discharge tube 111. The pump 116 operates to send the refrigerant liquid 30 from the suction tube 110 to the discharge tube 111. An open type in which the suction port and the discharge port are always in communication is applied to the pump 116.

  The pump 117 is provided in the second chamber 28. The other end of the discharge tube 113 and the other end of the suction tube 112 are connected to the pump 117. The pump 117 operates to send the refrigerant liquid 30 from the suction tube 112 to the discharge tube 113. As with the pump 116, an open type in which the suction port and the discharge port are always in communication is applied to the pump 117.

  The control unit 118 is electrically connected to the liquid level switches 114 and 115 and the pumps 116 and 117, and operates and stops the pumps 116 and 117 based on detection signals of the liquid level switches 114 and 115.

  In the immersion cooling device A7 according to the seventh embodiment, when the liquid level switch 114 detects that the height of the second region 35 has decreased to a predetermined position, the controller 118 The pump 116 is operated by being controlled by. Thereby, the refrigerant liquid 30 is sent from the suction tube 110 to the discharge tube 111 through the pump 116, and the refrigerant liquid 30 is supplied from the first tank 11 to the second chamber 28 of the second tank 12.

  As a result, even if the second refrigerant liquid 32 continues to evaporate in the second region 35, it can be avoided that the height of the second region 35 falls below the lower end portion of the partition wall 18. Therefore, since the airtightness of the first tank 11 is maintained, it is possible to prevent the vapor 33 of the first refrigerant liquid 31 from being released to the atmospheric space 60 through the opening 14. The pump 116 is stopped at the timing when the height of the second region 35 is increased to the specified height.

  In the immersion cooling device A7 according to the seventh embodiment, when the liquid level switch 115 detects that the height of the second region 35 has risen to a predetermined position, the control unit 118 The pump 117 is operated by being controlled by. Thereby, the refrigerant liquid 30 is sent from the suction tube 112 to the discharge tube 113 through the pump 117, and the refrigerant liquid 30 is supplied from the second chamber 28 of the second tank 12 to the first tank 11. Thereby, the refrigerant liquid 30 can be prevented from overflowing from the opening 14. As a result, the liquid levels of the first refrigerant liquid 31 and the second refrigerant liquid 32 can be kept constant. The pump 117 is stopped at the timing when the height of the second region 35 is reduced to the specified height.

[Eighth embodiment]
Next, an eighth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A8 according to the eighth embodiment shown in FIG. 8 is changed in configuration as follows with respect to the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above.

  That is, the immersion cooling device A8 according to the eighth embodiment includes the immersion tank 100. The immersion tank 100 is composed of a single tank. As an example, the immersion tank 100 is a sealed type having a top wall 101. The immersion tank 100 may be an open type that opens upward.

  The liquid immersion tank 100 stores a refrigerant liquid 30, and a plurality of fillers 40 filled in the liquid immersion tank 100 are floated on the surface of the refrigerant liquid 30. The surface of the refrigerant liquid 30 is covered with a plurality of fillers 40.

  In the immersion cooling device A8 according to the eighth embodiment, the circulation mechanism 50 is the same as that in the first embodiment described above. The suction pipe 51 and the supply pipe 52 of the circulation mechanism 50 are connected to a pair of side walls 102 and 103 in the liquid immersion tank 100, respectively. Each of the plurality of fillers 40 is formed larger than the connection port 55 between the suction pipe 51 and the immersion tank 100. The suction pipe 51 is an example of a “circulation mechanism pipe”.

  In addition, when comparing the magnitude | size of the filler 40 and the connection port 55, the magnitude | size of the filler 40 is a measurement value at the time of measuring the dimension of several arbitrary directions of the filler 40 linearly. It is defined by the minimum value of. The size of the connection port 55 is defined by the inner diameter (diameter) of the connection port 55 when the connection port 55 is circular.

  In the immersion cooling device A8 according to the eighth embodiment, the configuration other than the above is the same as the immersion cooling device A1 (see FIG. 1) according to the first embodiment described above.

  Then, the effect | action and effect of 8th embodiment are demonstrated.

  In the immersion cooling device A8 according to the eighth embodiment, the immersion tank 100 is filled with a plurality of fillers 40, and the plurality of fillers 40 is the surface of the refrigerant liquid 30 stored in the immersion tank 100. And covers the surface of the refrigerant liquid 30. Therefore, since exposure of the surface of the refrigerant liquid 30 can be suppressed, evaporation of the refrigerant liquid 30 can be suppressed. Thereby, the reduction | decrease of the refrigerant liquid 30 can be suppressed.

  Further, since each of the plurality of fillers 40 is larger than the connection port 55 between the suction pipe 51 and the liquid immersion tank 100, the filler 40 is sucked into the circulation mechanism 50 and problems such as clogging occur in the circulation mechanism 50. This can be suppressed.

[Ninth embodiment]
Next, a ninth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A9 according to the ninth embodiment shown in FIG. 9 is configured as follows with respect to the immersion cooling device A8 (see FIG. 8) according to the eighth embodiment described above. That is, the plurality of fillers 40 filled in the immersion bath 100 are stacked in two layers.

  If it does in this way, since the sealing nature of a plurality of fillers 40 improves, it can control still more effectively that refrigerant fluid 30 evaporates.

  In addition, the several filler 40 with which the immersion tank 100 was filled may be stacked | piled up in three or more layers.

[Tenth embodiment]
Next, a tenth embodiment of the technology disclosed in the present application will be described.

  The immersion cooling device A10 according to the tenth embodiment shown in FIG. 10 is configured as follows with respect to the immersion cooling device A8 (see FIG. 8) according to the eighth embodiment described above.

  That is, the surface of the refrigerant liquid 30 is covered with the evaporation suppression liquid 90 that suppresses the evaporation of the refrigerant liquid 30. As the evaporation suppression liquid 90, a liquid having a density lower than that of the refrigerant liquid 30 and higher than that of the filler 40 is used. As such an evaporation suppression liquid 90, for example, silicon oil is used. The plurality of fillers 40 are floated on the surface of the refrigerant liquid 30 via the evaporation suppression liquid 90.

  If it does in this way, since the sealing with respect to the surface of the refrigerant | coolant liquid 30 improves, it can suppress more effectively that the refrigerant | coolant liquid 30 evaporates.

  Note that, as in the above-described ninth embodiment, the plurality of fillers 40 may be stacked in layers on the evaporation suppression liquid 90. If it does in this way, the sealing nature with respect to the surface of refrigerant liquid 30 can further be improved.

  Of the plurality of techniques applied to the first to tenth embodiments, the combinable techniques may be appropriately combined.

  As mentioned above, although an example of the technique which this application discloses was demonstrated, the technique which this application discloses is not limited above, In addition to the above, various deformation | transformation is possible within the range which does not deviate from the meaning. Of course there is.

  In addition, the following additional remarks are disclosed about an example of the technique which the above-mentioned application discloses.

(Appendix 1)
An immersion bath;
A refrigerant liquid stored in the immersion tank;
A plurality of fillers that fill the liquid immersion tank and float on the surface of the refrigerant liquid and cover the surface of the refrigerant liquid;
An immersion cooling device comprising:
(Appendix 2)
The immersion tank is
A sealed first tank having a ceiling wall;
A second tank provided adjacent to the side of the first tank;
A sealed gas space connecting the liquid level of the refrigerant liquid in the first tank and the first region of the liquid level of the refrigerant liquid in the second tank;
An opening for opening a second region of the liquid level of the refrigerant liquid in the second tank to the atmospheric space;
Have
The plurality of fillers are floated on the second region and cover the second region,
The immersion cooling apparatus according to appendix 1.
(Appendix 3)
The second tank is
An upper wall and a lower wall;
A partition wall extending from the upper wall to the lower wall side;
Have
Between the partition wall between the first tank and the second tank and the upper wall, a gas passage located in the gas space is provided,
Between the lower wall and the partition wall, a refrigerant liquid passage located in the refrigerant liquid in the second tank is provided,
The opening is formed on the opposite side of the partition wall from the partition wall in the second tank.
The immersion cooling apparatus according to appendix 2.
(Appendix 4)
A suction tube having one end immersed in the refrigerant liquid in the first tank;
A discharge tube having one end positioned above the second region and above the liquid level of the refrigerant liquid in the second tank;
A liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has dropped to a predetermined position;
A pump that connects the other end of the suction tube and the other end of the discharge tube, and sends the refrigerant liquid from the suction tube to the discharge tube;
A controller that activates the pump when the liquid level switch detects that the height of the second region has decreased to a predetermined position; and
Further comprising
The immersion cooling apparatus according to appendix 3.
(Appendix 5)
The opening is at a position higher than the gas passage;
The immersion cooling apparatus according to appendix 3.
(Appendix 6)
A suction tube having one end immersed in the refrigerant liquid in the second tank;
A discharge tube having one end positioned above the liquid level of the refrigerant liquid in the first tank;
A liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has risen to a predetermined position;
A pump that connects the other end of the suction tube and the other end of the discharge tube, and sends the refrigerant liquid from the suction tube to the discharge tube;
A controller that activates the pump when the liquid level switch detects that the height of the second region has risen to a predetermined position;
Further comprising
The immersion cooling apparatus according to appendix 3.
(Appendix 7)
A first suction tube having one end immersed in the refrigerant liquid in the first tank;
A first discharge tube having one end positioned above the second region and above the liquid level of the refrigerant liquid in the second tank;
A second suction tube having one end immersed in the refrigerant liquid in the second tank;
A second discharge tube having one end positioned above the liquid level of the refrigerant liquid in the first tank;
A first liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has decreased to a predetermined position;
A second liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has risen to a predetermined position;
A first pump that connects the other end of the first suction tube and the other end of the first discharge tube, and sends the refrigerant liquid from the first suction tube to the first discharge tube;
A second pump that connects the other end of the second suction tube and the other end of the second discharge tube, and sends the refrigerant liquid from the second suction tube to the second discharge tube;
When it is detected by the first liquid level switch that the height of the second region has decreased to a predetermined position, the first pump is operated, and the second liquid level switch is used to A controller that activates the second pump when it is detected that the height of the region has risen to a predetermined position; and
Further comprising
The immersion cooling apparatus according to appendix 3.
(Appendix 8)
The surface area of the second region is smaller than the surface area of the liquid surface of the refrigerant liquid in the first tank,
The immersion cooling apparatus according to any one of appendix 2 to appendix 7.
(Appendix 9)
A circulation mechanism that is connected to the first tank and circulates the refrigerant liquid between the first tank and cools the refrigerant liquid;
The immersion cooling apparatus according to any one of appendix 2 to appendix 8.
(Appendix 10)
The refrigerant liquid is
A first refrigerant liquid stored in the first tank;
A second refrigerant liquid stored in the second tank;
Have
The first refrigerant liquid and the second refrigerant liquid are the same liquid.
The immersion cooling device according to any one of appendix 2 to appendix 9.
(Appendix 11)
A circulation mechanism connected to the liquid immersion tank, circulating the refrigerant liquid between the liquid immersion tank and cooling the refrigerant liquid;
The filler is larger than the connection port between the circulation mechanism piping and the immersion tank,
The immersion cooling apparatus according to appendix 1.
(Appendix 12)
The filler is a resin foam material,
The immersion cooling device according to any one of appendices 1 to 11.
(Appendix 13)
The filler has a lower density than the refrigerant liquid,
The immersion cooling device according to any one of appendix 1 to appendix 12.
(Appendix 14)
The filler has poor absorbability with respect to the refrigerant liquid.
The immersion cooling device according to any one of appendices 1 to 13.
(Appendix 15)
The plurality of fillers are stacked in layers.
The immersion cooling device according to any one of appendices 1 to 14.
(Appendix 16)
The surface of the refrigerant liquid is covered with an evaporation suppression liquid that suppresses evaporation of the refrigerant liquid,
The plurality of fillers are floated on the surface of the refrigerant liquid via the evaporation suppression liquid.
The immersion cooling device according to any one of appendices 1 to 15.
(Appendix 17)
The refrigerant liquid is a fluorine-based inert liquid.
The immersion cooling device according to any one of appendices 1 to 16.
(Appendix 18)
An immersion bath;
A refrigerant liquid stored in the immersion tank;
A plurality of fillers that are filled in the immersion tank and floated on the surface of the refrigerant liquid and cover the surface of the refrigerant liquid;
An electronic device immersed in the refrigerant liquid;
An information processing apparatus comprising:

A1 to A10 Immersion cooling device 10 Immersion tank 11 First tank 12 Second tank 13 Gas space 14 Opening port 15 Top wall 16 Upper wall 17 Lower wall 18 Partition wall 19 Partition wall 20 Gas passage 21 Refrigerant liquid passage 23 First tank Side wall 24 facing the partition wall in the second tank Side wall 30 facing the partition wall in the second tank 30 Refrigerant liquid 31 First refrigerant liquid 32 Second refrigerant liquid 34 First region 35 Second region 40 Filler 50 Circulation mechanism 51 Suction pipe 60 Atmospheric space 70 Electronic Device 80 Information Processing Device 90 Evaporation Suppression Liquid 100 Immersion Tank 101 Top Wall 102 Side Wall 110 Suction Tube 111 Discharge Tube 112 Suction Tube 113 Discharge Tube 114 Liquid Level Switch 115 Liquid Level Switch 116 Pump 117 Pump 118 Control Unit

Claims (12)

An immersion bath;
A refrigerant liquid stored in the immersion tank;
A plurality of fillers that fill the liquid immersion tank and float on the surface of the refrigerant liquid and cover the surface of the refrigerant liquid;
An immersion cooling device comprising: The immersion tank is
A sealed first tank having a ceiling wall;
A second tank provided adjacent to the side of the first tank;
A sealed gas space connecting the liquid level of the refrigerant liquid in the first tank and the first region of the liquid level of the refrigerant liquid in the second tank;
An opening for opening a second region of the liquid level of the refrigerant liquid in the second tank to the atmospheric space;
Have
The plurality of fillers are floated on the second region and cover the second region,
The immersion cooling apparatus according to claim 1. The second tank is
An upper wall and a lower wall;
A partition wall extending from the upper wall to the lower wall side;
Have
Between the partition wall between the first tank and the second tank and the upper wall, a gas passage located in the gas space is provided,
Between the lower wall and the partition wall, a refrigerant liquid passage located in the refrigerant liquid in the second tank is provided,
The opening is formed on the opposite side of the partition wall from the partition wall in the second tank.
The immersion cooling apparatus according to claim 2. A suction tube having one end immersed in the refrigerant liquid in the first tank;
A discharge tube having one end positioned above the second region and above the liquid level of the refrigerant liquid in the second tank;
A liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has dropped to a predetermined position;
A pump that connects the other end of the suction tube and the other end of the discharge tube, and sends the refrigerant liquid from the suction tube to the discharge tube;
A controller that activates the pump when the liquid level switch detects that the height of the second region has decreased to a predetermined position; and
Further comprising
The immersion cooling apparatus according to claim 3. The opening is at a position higher than the gas passage;
The immersion cooling apparatus according to claim 3. A suction tube having one end immersed in the refrigerant liquid in the second tank;
A discharge tube having one end positioned above the liquid level of the refrigerant liquid in the first tank;
A liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has risen to a predetermined position;
A pump that connects the other end of the suction tube and the other end of the discharge tube, and sends the refrigerant liquid from the suction tube to the discharge tube;
A controller that activates the pump when the liquid level switch detects that the height of the second region has risen to a predetermined position;
Further comprising
The immersion cooling apparatus according to claim 3. A first suction tube having one end immersed in the refrigerant liquid in the first tank;
A first discharge tube having one end positioned above the second region and above the liquid level of the refrigerant liquid in the second tank;
A second suction tube having one end immersed in the refrigerant liquid in the second tank;
A second discharge tube having one end positioned above the liquid level of the refrigerant liquid in the first tank;
A first liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has decreased to a predetermined position;
A second liquid level switch that is disposed above the lower end of the partition wall and detects that the height of the second region has risen to a predetermined position;
A first pump that connects the other end of the first suction tube and the other end of the first discharge tube, and sends the refrigerant liquid from the first suction tube to the first discharge tube;
A second pump that connects the other end of the second suction tube and the other end of the second discharge tube, and sends the refrigerant liquid from the second suction tube to the second discharge tube;
When it is detected by the first liquid level switch that the height of the second region has decreased to a predetermined position, the first pump is operated, and the second liquid level switch is used to A controller that activates the second pump when it is detected that the height of the region has risen to a predetermined position; and
Further comprising
The immersion cooling apparatus according to claim 3. The surface area of the second region is smaller than the surface area of the liquid surface of the refrigerant liquid in the first tank,
The immersion cooling device according to any one of claims 2 to 7. A circulation mechanism that is connected to the first tank and circulates the refrigerant liquid between the first tank and cools the refrigerant liquid;
The immersion cooling device according to any one of claims 2 to 8. The refrigerant liquid is
A first refrigerant liquid stored in the first tank;
A second refrigerant liquid stored in the second tank;
Have
The first refrigerant liquid and the second refrigerant liquid are the same liquid.
The immersion cooling device according to any one of claims 2 to 9. A circulation mechanism connected to the liquid immersion tank, circulating the refrigerant liquid between the liquid immersion tank and cooling the refrigerant liquid;
The filler is larger than the connection port between the circulation mechanism piping and the immersion tank,
The immersion cooling apparatus according to claim 1. An immersion bath;
A refrigerant liquid stored in the immersion tank;
A plurality of fillers that fill the liquid immersion tank and float on the surface of the refrigerant liquid and cover the surface of the refrigerant liquid;
An electronic device immersed in the refrigerant liquid;
An information processing apparatus comprising: