JP2020017594A - Cooling plate - Google Patents

Abstract

To provide a cooling plate that can be downsized.SOLUTION: A cooling plate 100 includes a case with a sealed internal space, a liquid solvent disposed in the internal space, a solid solute that causes an endothermic reaction when dissolved in the liquid solvent by being separated from the liquid solvent in the internal space, and a mixing unit that dissolves the solid solute in the liquid solvent by releasing the isolation state between the liquid solvent and the solid solute and mixing the solid solute and the liquid solvent. The cooling plate 100 can quickly and reliably cool a heating element.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cooling plate for cooling an electronic device having an electric component.

  In recent years, electronic circuits have been highly integrated, and the amount of heat generated per unit area has been increasing. A microwave circuit, which is one type of electronic circuit and in which a plurality of high-frequency semiconductors operated by microwaves are integrated, may include an amplifier made of a gallium nitride (GaN) semiconductor. An amplifier made of a gallium nitride semiconductor generates a particularly large amount of heat per unit area. For this reason, a microwave circuit on which an amplifier made of a gallium nitride semiconductor is mounted needs a high heat radiation capability for a cooling plate of the microwave circuit. A microwave circuit on which an amplifier made of a gallium nitride semiconductor is mounted is an example of an electronic circuit that generates a particularly large amount of heat.

  Active phased array antennas composed of such a microwave circuit are required to be reduced in size while increasing the amount of heat generated with higher output and faster signal processing.

  In Patent Document 1, a heat storage material that causes a state change from a solid phase to a liquid phase at a predetermined temperature is sealed in a metal plate, and the latent heat of the heat storage material is used to raise the temperature of an electronic device mounted on a cooling plate. A cooling plate that suppresses the pressure is disclosed.

JP-A-2006-181636

  However, in the cooling method using the latent heat of the solid phase of the heat storage material as in the cooling plate of Patent Document 1, the solid phase heat storage material changes its phase to the liquid phase sequentially from a region near the heating element. Since the heat storage material in the liquid phase has high thermal resistance, the phase change of the heat storage material progresses, and the cooling rate decreases as the amount of the liquid phase existing between the heat transfer surface of the heating element and the solid phase increases. . Therefore, in the cooling method using the latent heat of the solid phase of the heat storage material, the electronic device to be cooled cannot be quickly cooled, and the heat generated by the electronic device before the electronic device is cooled to a desired temperature. As a result, the temperature of the electronic device may increase.

  The present invention has been made in view of the above, and an object of the present invention is to provide a cooling plate capable of quickly and reliably cooling a heating element.

  In order to solve the above-described problems and achieve the object, a cooling plate according to the present invention includes a case in which a sealed internal space is formed, a liquid solvent disposed in the internal space, and a liquid in the internal space. The solid solute, which is placed separately from the solvent and causes an endothermic reaction when dissolved in the liquid solvent, and the solid solute is mixed with the liquid solvent by releasing the separation between the liquid solvent and the solid solute And a mixing section for dissolving the solid solute in the liquid solvent.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the cooling plate which can cool a heating element quickly and reliably is obtained.

FIG. 3 is a perspective view showing a state in which a heating element is mounted on the cooling plate according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view for explaining the structure of the cooling plate according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view illustrating a state where the temperature of the cooling plate according to the first embodiment of the present invention is increased. FIG. 3 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view illustrating a structure of a cooling plate according to a second embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the second embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing a structure of a cooling plate according to a third embodiment of the present invention. FIG. 7 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the third embodiment of the present invention. FIG. 4 is a schematic cross-sectional view illustrating a structure of a cooling plate according to a fourth embodiment of the present invention. FIG. 7 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the fourth embodiment of the present invention. FIG. 7 is a schematic cross-sectional view illustrating a structure of a cooling plate according to a fifth embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the fifth embodiment of the present invention. FIG. 9 is a schematic cross-sectional view illustrating a structure of a cooling plate according to a sixth embodiment of the present invention. FIG. 14 is a schematic cross-sectional view showing a state where salts and water are mixed in the cooling plate according to the sixth embodiment of the present invention.

  Hereinafter, a cooling plate according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the embodiment. In the following drawings, the same or corresponding parts are denoted by the same reference numerals and described.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a state in which a heating element 20 is mounted on a cooling plate 100 according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view for explaining the structure of cooling plate 100 according to the first embodiment of the present invention. FIG. 2 is a schematic sectional view taken along line II-II in FIG. In FIG. 2, the illustration of the heating element 20 is omitted. The cooling plate 100 according to the first embodiment is a cooling plate for radiating heat generated by the heating element 20 mounted on an electronic device. One example of the heating element 20 is a microwave circuit.

  The cooling plate 100 according to the first embodiment has a rectangular parallelepiped shape in which the area of the upper surface 1a and the lower surface 1b is larger than the area of the side surfaces 1c, 1d, 1e, 1f, and has the case 1 made of metal. FIG. 1 shows a cooling plate 100 having a flat plate shape. The heating element 20 is fixed on the upper surface 1a of the cooling plate 100 with an adhesive.

  The case 1 includes a cooling plate case main body 2a as a first component of the case 1 and a cooling plate cover 2b as a second component of the case 1. The cooling plate cover 2b is attached to the case 1 on the upper surface 1a side.

  The cooling plate case main body 2a and the cooling plate cover 2b have recesses formed on opposing surfaces of each other. Thereby, the cooling plate case main body 2a and the cooling plate cover 2b are integrated with each other, so that the internal space 3 is formed inside the case 1. The contact surface of the cooling plate case body 2a and the cooling plate cover 2b are joined together by a method such as welding to form an integral part. Thereby, the internal space 3 is sealed inside the case 1. That is, the internal space 3 is a hollow portion sealed inside the case 1. The internal space 3 is formed in a region including the heating element 20 in the in-plane direction of the cooling plate 100, that is, in the in-plane direction of the upper surface 1a.

  As shown in FIG. 2, the internal space 3 of the cooling plate 100 is separated by a partition member 7 into a first internal space 3 a that is a first space in the internal space 3 and a second internal space that is a second space in the internal space 3. The internal space 3b is partitioned. That is, the first internal space 3a and the second internal space 3b are adjacent to each other in the internal space 3 via the partition member 7. And the 1st internal space 3a and the 2nd internal space 3b are each sealed. Therefore, the first internal space 3 a is a first hollow portion inside the case 1. The second internal space 3b is a second hollow portion inside the case 1.

  Salts 4 which are solid solutes are sealed in the first internal space 3a. The solid solute is a solute that is disposed separately from the liquid solvent in the internal space 3 and causes an endothermic reaction when dissolved in the liquid solvent. Salts 4 are substances that cause an endothermic reaction when dissolved in water 5. Although the amount of the salt 4 enclosed in the first internal space 3a is not particularly limited, it is preferable that the amount be such that the effect of the endothermic reaction is more obtained. The salts 4 are solid substances that are in a solid state in a standard state, such as ammonium nitrate, potassium chlorate, and urea. The standard state here is a state of 25 ° C. and 1 atm. When the salt 4 is a substance having a corrosive property to the metal constituting the case 1, the surface of the concave portion in the cooling plate case body 2a and the cooling plate cover 2b is subjected to a surface treatment to improve the corrosion resistance. Need to be kept.

  Water 5 which is a liquid solvent is sealed in the second internal space 3b. The water 5 is stored in a bag-shaped container 6 made of a thin film, and is sealed together with the container 6 in the second internal space 3b. By enclosing the water 5 in the container 6 together with the container 6 in the second internal space 3b, installation of the water 5 in the second internal space 3b becomes easy. In addition, the water 5 may be sealed in the first internal space 3a, and the salt 4 may be sealed in the second internal space 3b. The solid solute is a solute that is disposed separately from the liquid solvent in the internal space 3 and causes an endothermic reaction when dissolved in the liquid solvent.

  The partitioning component 7 partitions the internal space 3 such that the first internal space 3a and the second internal space 3b are each hermetically closed at the time when the heating element 20 is not generating heat. That is, the partition component 7 separates the salt 4 and the water 5. The partition component 7 includes a first partition component 7a disposed on the cooling plate case body 2a side and a second partition component 7b disposed on the cooling plate cover 2b side. The first partition part 7a and the second partition part 7b are needle portions made of a shape memory alloy.

  The shape memory alloy is an alloy having a property of recovering the original shape when heated to a predetermined recovery temperature or higher, even if the shape memory alloy is deformed from the original shape below a predetermined recovery temperature. When the first partitioning member 7a and the second partitioning member 7b reach a predetermined recovery temperature, they deform to recover to their original shape, and break through the container 6 storing the water 5. Then, the salt 4 is dissolved in the water 5 to form a solution 8.

  That is, the partition component 7 is a mixing unit that releases the separated state of the liquid solvent and the solid solute to mix the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent. Then, the partition member 7 is deformed to make the first internal space 3a and the second internal space 3b communicate with each other to release the separated state between the liquid solvent and the solid solute.

  Examples of the shape memory alloy include a nickel titanium alloy and an iron-manganese-silicon alloy. By changing the composition of the shape memory alloy, the first partition part 7a and the second partition part 7b can be deformed at an arbitrary temperature. The first partition part 7a and the second partition part 7b are made of the same shape memory alloy. Therefore, when the temperature rises, the first partition part 7a and the second partition part 7b return to the original shape at the same temperature. The shape memory alloy constituting the first partition part 7a and the second partition part 7b is appropriately selected based on the temperature of the heating element 20 in which the cooling function of the cooling plate 100 is desired to be exhibited and the predetermined recovery temperature of the shape memory alloy. Just do it.

  The partition part 7 may be a needle part in which one of the first partition part 7a and the second partition part 7b is made of a shape memory alloy even if the whole is not made into a needle part.

  Next, the operation of the cooling plate 100 according to the first embodiment will be described. FIG. 3 is a schematic cross-sectional view illustrating a state where the temperature of the cooling plate 100 according to the first embodiment of the present invention increases. FIG. 4 is a schematic cross-sectional view showing a state where salts 4 and water 5 are mixed in cooling plate 100 according to the first embodiment of the present invention. In FIG. 4, the illustration of the container 6 is omitted.

  The temperature of the cooling plate 100 increases due to the heat generated by the heating element 20 installed on the upper surface 1a. That is, a part of the heat generated by the heating element 20 is transmitted from the upper surface 1a to the cooling plate cover 2b. Part of the heat transmitted from the upper surface 1a to the cooling plate cover 2b is transmitted to the first partition member 7a arranged in the internal space 3 via the cooling plate cover 2b and the cooling plate case main body 2a. Further, a part of the heat transmitted from the upper surface 1a to the cooling plate cover 2b is transmitted to the second partition member 7b arranged in the internal space 3.

  The temperature of the first partition component 7a and the second partition component 7b increases due to the above-described heat transmission. When the first partitioning part 7a and the second partitioning part 7b reach a predetermined recovery temperature of the shape memory alloy constituting the first partitioning part 7a and the second partitioning part 7b, as shown in FIG. Is deformed into a predetermined original shape protruding toward the second internal space 3b so as to communicate the first internal space 3a and the second internal space 3b and to store the water 5 in the container 6. Break through.

  Thus, the water 5 contained in the container 6 flows out of the container 6 and spreads in the second internal space 3b and the first internal space 3a. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. Then, when the salts 4 are dissolved in the water 5 to form the solution 8, a rapid endothermic reaction occurs to absorb the surrounding heat. The chemical reaction between the salts 4 and the water 5 is completed instantaneously, lowering the temperature of the whole solution 8. Then, the heating element 20 is cooled by the solution 8 performing heat exchange on the contact surface of the cooling plate 100 with the case 1 to lower the temperature of the cooling plate 100. For example, when the salt 4 is ammonium nitrate, the following chemical reaction occurs.

NH ₄ NO ₃ (solid) + aq = NH ₄ NO ₃ aq−25.7 kJ (per 1 mol)

Further, it is preferable that ammonium nitrate and water are mixed at a mass ratio of 4: 3. For example, when solid ammonium nitrate having an outer dimension of 100 mm × 100 mm × 10 mm is used as the salt 4, the capacity of the water 5 is 127.5 cm ³ . At this time, since the molar mass of ammonium nitrate is 80.04 g / mol and the density is 0.0017 g / mm ³ , the temperature can be kept constant for 55 seconds when 1 kW of heat is generated. That is, the first internal space 3a containing 100 cm ³ of ammonium nitrate, the second internal space 3b containing the container 6 containing 127.5 cm ³ of water, and the partition member 7 are provided inside the cooling plate 100. When the heat of 1 kW is transmitted to the cooling plate 100, the temperature of the cooling plate 100 can be kept constant for 55 seconds.

  As described above, the cooling plate 100 utilizes the endothermic reaction when the salts 4 are dissolved in the water 5 to form the solution 8, and the capacity of the salts 4 and the water 5 is 4: 3 by mass ratio. By adjusting in advance, the cooling capacity can be improved without waste in direct proportion to the volume of the salt 4 and the water 5. That is, in the cooling plate 100, the chemical reaction between the salts 4 and the water 5 is instantaneously completed, and the temperature of the entire solution 8 is lowered. The solution 8 exchanges heat with the case 1 over the entire contact surface of the cooling plate 100 with the case 1 to lower the temperature of the cooling plate 100, so that the temperature of the cooling plate 100 quickly decreases. Thereby, the cooling plate 100 can quickly cool the heating element 20 and can surely cool the heating element 20 to a desired temperature.

  In contrast, in the cooling method in which the heat storage material is sealed inside the cooling plate and the heating element is cooled using the latent heat of the heat storage material, the heat storage material after the phase change to the liquid phase has a large thermal resistance, Even if the volume of the heat storage material enclosed inside the cooling plate is increased, the cooling capacity does not increase in direct proportion to the volume. That is, since the heat storage material in the liquid phase has large thermal resistance, the phase change of the heat storage material progresses, and the cooling rate increases as the amount of the liquid phase existing between the heat transfer surface of the heating element and the solid phase increases. descend. For this reason, in the cooling method using the latent heat of the solid phase of the heat storage material, the heating element to be cooled cannot be quickly cooled, and the heat generation of the heating element before the heating element is cooled to a desired temperature. This could increase the temperature of the heating element.

  Therefore, the cooling plate 100 can quickly and surely cool the heating element 20 as compared with the cooling method in which the heating element is cooled using the latent heat of the heat storage material.

  In addition, the cooling plate 100 is generated in the heating element 20 with a small volume and without complicating or enlarging the structure by enclosing the salt 4, the water 5, and the partition member 7 in the interior space 3. By absorbing the heat transmitted to the cooling plate 100, the heating element 20 can be cooled. Further, the cooling plate 100 can mount a member exhibiting a cooling function in a small volume with a high density, as compared with a case where a large number of fins are provided on a metal plate or a case where a heat pipe is provided on a metal plate. . Thus, when the cooling plate 100 obtains the same cooling effect, it is possible to reduce the size, increase the density, and reduce the cost of the cooling plate as compared with a cooling plate having another configuration.

  The cooling function of the cooling plate 100 uses an irreversible phenomenon, and the cooling function is used only once. Therefore, the cooling plate 100 is a product that requires only one product operation and does not require reuse, such as an active phased array antenna for a flying object. The cooling function as the cooling plate 100 is used only once. It is suitable for products that are suitable for

  As described above, the cooling plate 100 according to the first embodiment encloses the salts 4, the water 5, and the partitioning parts 7 in the internal space 3, without complicating the structure and increasing the size. There is an effect that a cooling plate capable of quickly and reliably cooling the heating element 20 can be obtained.

Embodiment 2 FIG.
FIG. 5 is a schematic sectional view illustrating the structure of the cooling plate 110 according to the second embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing a state where salts 4 and water 5 are mixed in cooling plate 110 according to the second embodiment of the present invention. The same or equivalent components as those of the cooling plate 100 according to the above-described first embodiment are denoted by the same reference numerals, and only the differences from the first embodiment will be described below.

  As shown in FIG. 5, the internal space 3 of the cooling plate 110 is divided into a first internal space 3a and a second internal space 3b via a partition member 11. That is, the first internal space 3 a and the second internal space 3 b are adjacent to each other in the internal space 3 via the partition part 11. And the 1st internal space 3a and the 2nd internal space 3b are each sealed.

  Salts 4 are sealed in the first internal space 3a. The water 5 is directly sealed in the second internal space 3b.

  The partition component 11 partitions the first internal space 3a and the second internal space 3b when the heating element 20 is not generating heat. This prevents the water 5 from flowing from the second internal space 3b to the first internal space 3a. That is, the partition component 11 separates the salt 4 and the water 5. The partition component 11 is configured to be broken and deformed when a predetermined breaking pressure is applied. Unlike the cooling plate 100 according to the first embodiment, the partition component 11 has no needle-shaped component. The partition part 11 is formed of, for example, a resin thin film.

  That is, the partition member 11 is a mixing unit that releases the separated state of the liquid solvent and the solid solute and mixes the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent. Then, the partition component 11 breaks and deforms, thereby connecting the first internal space 3a and the second internal space 3b to release the isolated state between the liquid solvent and the solid solute.

  In the cooling plate 110 according to the second embodiment, the temperature of the water 5 in the second internal space 3b rises due to the heat generated by the heating element 20 installed on the upper surface 1a, and the water 5 expands. When the pressure of the second internal space 3b reaches a predetermined breaking pressure due to the expansion of the water 5, the partition member 11 is broken and deformed as shown in FIG. It flows into the internal space 3a. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. Thus, similarly to the cooling plate 100 according to the first embodiment, an effect of cooling the heating element 20 by absorbing heat generated in the heating element 20 and transmitted to the cooling plate 110 can be obtained.

  The amount of water 5 sealed in the second internal space 3b is set such that the mass ratio with respect to ammonium nitrate is set at a ratio of 4: 3, and the temperature of the heating element 20 at which the cooling function of the cooling plate 110 is desired to be exhibited. 5, is set in advance based on conditions such as the temperature of 5, the expansion coefficient of the water 5, and the predetermined breaking pressure of the partition member 11.

  The water 5 may be stored in the container 6 in the same manner as the cooling plate 100 according to the first embodiment, and may be sealed together with the container 6 in the second internal space 3b. In this case, the container 6 ruptures when a predetermined burst pressure equal to or lower than the predetermined burst pressure at which the partition member 11 breaks is applied. As a result, the temperature of the water 5 in the second internal space 3b rises, and the water 5 expands, so that the pressure in the container 6 becomes equal to or higher than the predetermined burst pressure. Thereby, the container 6 bursts and the water 5 overflows into the second internal space 3b. Thereafter, the temperature of the water 5 in the second internal space 3b further rises, and the pressure in the second internal space 3b reaches a predetermined burst pressure, so that the partition part 11 is broken, and the water 5 divides the partition part 7. And flows into the first internal space 3a.

  The predetermined burst pressure is not particularly limited as long as it is equal to or lower than the predetermined burst pressure at which the partition component 11 breaks. Even if the container 6 ruptures early and the water 5 overflows into the second internal space 3b, if the pressure in the second internal space 3b does not reach a predetermined breaking pressure, the partition member 11 does not break. However, it is necessary that the predetermined bursting pressure does not burst when the container 6 is sealed in the second internal space 3b, so that the pressure of the atmosphere in which the container 6 is sealed in the second internal space 3b, for example, the atmospheric pressure Must be larger than

  As described above, the cooling plate 110 according to the second embodiment encloses the salt 4, the water 5, and the partition member 7 inside the internal space 3, similarly to the cooling plate 100 according to the first embodiment. Accordingly, there is an effect that a cooling plate capable of quickly and surely cooling the heating element 20 can be obtained without complicating the structure and increasing the size.

Embodiment 3 FIG.
FIG. 7 is a schematic sectional view illustrating the structure of the cooling plate 120 according to the third embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing a state where salts 4 and water 5 are mixed in cooling plate 120 according to the third embodiment of the present invention. The same or equivalent components as those of the cooling plate 100 according to the above-described first embodiment are denoted by the same reference numerals, and only the differences from the first embodiment will be described below.

  As shown in FIG. 7, the internal space 3 of the cooling plate 120 is divided into a first internal space 3 a and a second internal space 3 b via a partition member 12. That is, the first internal space 3a and the second internal space 3b are adjacent to each other in the internal space 3 via the partition member 12. And the 1st internal space 3a and the 2nd internal space 3b are each sealed.

  Salts 4 are sealed in the first internal space 3a. The water 5 is directly sealed in the second internal space 3b.

  The partition component 12 includes a first partition component 12a disposed on the cooling plate case body 2a side and a second partition component 12b disposed on the cooling plate cover 2b side in the thickness direction of the cooling plate 120. The first partition part 12a has a first metal part 12a1 arranged on the side of the cooling plate case main body 2a, and a first seal part 12a2 connected to the side of the first metal part 12a1 on the side of the cooling plate cover 2b. The second partition part 12b has a second metal part 12b1 arranged on the cooling plate cover 2b side, and a second seal part 12b2 connected to the cooling plate case body 2a side of the second metal part 12b1. The first metal part 12a1 and the second metal part 12b1 are made of a shape memory alloy. The first seal portion 12a2 and the second seal portion 12b2 are made of rubber or resin used for a general sealing material. That is, the first partition part 12a and the second partition part 12b are each formed of a shape memory alloy and a sealing material.

  When the heating element 20 is not generating heat, the first partition part 12a and the second partition part 12b are in a state where the first seal part 12a2 and the second seal part 12b2 are in contact with each other, and the thickness direction of the cooling plate 120 is The partition center part 12c which is the center part of the partition part 12 is closed. Thereby, at the time when the heating element 20 is not generating heat, the partition component 12 partitions the first internal space 3a and the second internal space 3b so that the water 5 does not flow from the second internal space 3b to the first internal space 3a. It has become. That is, the partition component 12 separates the salt 4 and the water 5.

  That is, the partition member 12 is a mixing unit that releases the separated state of the liquid solvent and the solid solute and mixes the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent. Then, the partition component 12 breaks and deforms, thereby connecting the first internal space 3a and the second internal space 3b to release the isolated state between the liquid solvent and the solid solute.

  The temperature of the cooling plate 120 rises due to the heat generated by the heating element 20 installed on the upper surface 1a, and the temperature of the partition component 12 rises. When the first metal part 12a1 and the second metal part 12b1 reach a predetermined recovery temperature at which the shape memory alloy forming the first metal part 12a1 and the second metal part 12b1 deforms to the original shape, the partition part 12 As shown in FIG. 8, the first metal portion 12a1 and the second metal portion 12b1 are deformed into a predetermined original shape in which the tip portions on the sides facing each other protrude toward the second internal space 3b. The state where the first seal portion 12a2 and the second seal portion 12b2 are in contact with each other is released, and the central portion 12c of the partition is opened.

  Thereby, the water 5 flows into the first internal space 3a, and the salt 4 and the water 5 are mixed. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. That is, when the partition member 12 is lower than the predetermined recovery temperature, the cooling plate 120 closes the partition central portion 12c, separates the first internal space 3a and the second internal space 3b, and stores the salt 4 and water. 5 are isolated. Then, when the partition member 12 reaches a predetermined recovery temperature, the cooling plate 120 opens the partition central portion 12c, and the salt 4 and the water 5 are mixed. Thus, similarly to the cooling plate 100 according to the first embodiment, an effect of cooling the heating element 20 by absorbing the heat generated in the heating element 20 and transmitted to the cooling plate 120 can be obtained.

  The water 5 may be stored in the container 6 in the same manner as the cooling plate 100 according to the first embodiment, and may be sealed together with the container 6 in the second internal space 3b. In this case, when the first metal portion 12a1 and the second metal portion 12b1 reach a predetermined recovery temperature and are deformed to a predetermined original shape, the tip portions of the first seal portion 12a2 and the second seal portion 12b2 May pierce the container 6 storing the water 5.

  As described above, the cooling plate 120 according to the third embodiment encloses the salt 4, the water 5, and the partition member 12 inside the internal space 3, similarly to the cooling plate 100 according to the first embodiment. Accordingly, there is an effect that a cooling plate capable of quickly and surely cooling the heating element 20 can be obtained without complicating the structure and increasing the size.

Embodiment 4 FIG.
FIG. 9 is a schematic sectional view illustrating the structure of the cooling plate 130 according to the fourth embodiment of the present invention. FIG. 10 is a schematic cross-sectional view showing a state in which salts 4 and water 5 are mixed in cooling plate 130 according to the fourth embodiment of the present invention. In FIG. 10, the illustration of the container 6 is omitted. The same or equivalent components as those of the cooling plate 100 according to the above-described first embodiment are denoted by the same reference numerals, and only the differences from the first embodiment will be described below.

  As shown in FIG. 9, the cooling plate 130 is provided with a needle portion 13 as a protruding portion in a boundary region between the first internal space 3 a and the second internal space 3 b in the internal space 3. The first internal space 3a and the second internal space 3b are not sealed.

  Salts 4 are sealed in the first internal space 3a. The second internal space 3b is filled with water 5 stored in a container 6.

  In the cooling plate 130, when an inertial force due to an acceleration for moving the container 6 storing the water 5 in the direction of the needle 13 is applied, the container 6 moves in the direction of the inertial force 14. Thereby, the needle portion 13 breaks through the container 6 storing the water 5.

  Thereby, the water 5 flows into the first internal space 3a, and the salt 4 and the water 5 are mixed. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. Thus, similarly to the cooling plate 100 according to the first embodiment, an effect of cooling the heating element 20 by absorbing heat generated in the heating element 20 and transmitted to the cooling plate 100 is obtained.

  That is, the needle section 13 is a mixing section that releases the separated state of the liquid solvent and the solid solute and mixes the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent.

  As described above, the cooling plate 130 according to the fourth embodiment is similar to the cooling plate 100 according to the first embodiment by enclosing the salt 4, the water 5, and the needle 13 inside the internal space 3. In addition, a cooling plate capable of quickly and reliably cooling the heating element 20 can be obtained without complicating the structure and increasing the size.

Embodiment 5 FIG.
FIG. 11 is a schematic sectional view showing the structure of the cooling plate 140 according to the fifth embodiment of the present invention. FIG. 12 is a schematic cross-sectional view showing a state where salts 4 and water 5 are mixed in cooling plate 140 according to the fifth embodiment of the present invention. The same or equivalent components as those of the cooling plate 100 according to the above-described first embodiment are denoted by the same reference numerals, and only the differences from the first embodiment will be described below.

  As shown in FIG. 11, at the time when the heating element 20 does not generate heat, the internal space 3 of the cooling plate 140 is divided into the first internal space 3 a and the second internal space 3 b via the partitioning member 15. I have. That is, the first internal space 3a and the second internal space 3b are adjacent to each other in the internal space 3 via the partition member 15. And the 1st internal space 3a and the 2nd internal space 3b are each sealed.

  Salts 4 are sealed in the first internal space 3a. The water 5 is directly sealed in the second internal space 3b.

  The partition member 15 is made of a material that changes at a predetermined deterioration temperature equal to or lower than the temperature of the heating element 20 in which the cooling function of the cooling plate 140 is desired to be exhibited. The partition part 15 is deteriorated when the temperature reaches a predetermined deterioration temperature, and allows the water 5 to flow from the second internal space 3b to the first internal space 3a. One example of alteration is melting. An example of a material forming the partition member 15 is a low melting point material such as paraffin having a melting point of 60 degrees or less. The material forming the partition component 15 may be appropriately selected based on the temperature of the heating element 20 for which the cooling function of the cooling plate 140 is desired and the melting point of the material.

  The partition part 15 made of paraffin will be described as an example. The temperature of the cooling plate 140 rises due to the heat generated by the heating element 20 installed on the upper surface 1a, and the temperature of the partition component 15 rises. When the predetermined melting temperature is reached, the partition component 15 melts and spreads and accumulates at the bottom of the internal space 3.

  Thereby, the water 5 can flow into the first internal space 3a from the second internal space 3b, the water 5 flows into the first internal space 3a, and the salts 4 and the water 5 are mixed. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. Thus, similarly to the cooling plate 100 according to the first embodiment, an effect of cooling the heating element 20 by absorbing heat generated in the heating element 20 and transmitted to the cooling plate 140 can be obtained.

  That is, the partition component 15 is a mixing unit that releases the separated state of the liquid solvent and the solid solute and mixes the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent. Then, the partitioning member 15 dissolves the first internal space 3a and the second internal space 3b to communicate with each other, and releases the separated state of the liquid solvent and the solid solute.

  The water 5 may be stored in the container 6 in the same manner as the cooling plate 100 according to the first embodiment, and may be sealed together with the container 6 in the second internal space 3b. In this case, the container 6 deteriorates when it reaches a predetermined container deterioration temperature equal to or lower than the predetermined deterioration temperature at which the partitioning part 15 changes, enabling the water 5 to flow out of the container 6 into the second internal space 3b. I do. Thereby, when the temperature of the cooling plate 100 rises and the temperature of the container 6 reaches a predetermined container alteration temperature, the container 6 is altered and the water 5 overflows into the second internal space 3b. Thereafter, the temperature of the cooling plate 100 further rises, and the temperature of the partition component 15 reaches a predetermined degraded temperature, whereby the partition component 15 is degraded, and the water 5 passes through the partition component 15 to the first internal space 3a. Flow in.

  The predetermined container alteration temperature is not particularly limited as long as it is a temperature that does not alter when the container 6 is sealed in the second internal space 3b and is equal to or lower than the predetermined alteration temperature. Even if the container 6 deteriorates quickly and the water 5 overflows into the second internal space 3b, the partition 15 does not deteriorate unless the temperature of the partition 15 reaches a predetermined deterioration temperature. However, since the predetermined container alteration temperature must not be altered at the time of enclosing the container 6 in the second internal space 3b, it is higher than the temperature of the atmosphere in which the container 6 is enclosed in the second internal space 3b. It is necessary. An example of the temperature of the atmosphere in which the container 6 is sealed in the second internal space 3b is 25 ° C. which is a standard state.

  As described above, the cooling plate 140 according to the fifth embodiment is similar to the cooling plate 100 according to the first embodiment by enclosing the salt 4, the water 5, and the partitioning parts 15 in the internal space 3. In addition, a cooling plate capable of quickly and reliably cooling the heating element 20 can be obtained without complicating the structure and increasing the size.

Embodiment 6 FIG.
FIG. 13 is a schematic sectional view illustrating the structure of the cooling plate 150 according to the sixth embodiment of the present invention. FIG. 14 is a schematic cross-sectional view showing a state where salts 4 and water 5 are mixed in cooling plate 150 according to the sixth embodiment of the present invention. The same or equivalent components as those of the cooling plate 100 according to the above-described first embodiment are denoted by the same reference numerals, and only the differences from the first embodiment will be described below.

  As shown in FIG. 13, when the heating element 20 is not generating heat, the internal space 3 of the cooling plate 150 is partitioned into the first internal space 3 a and the second internal space 3 b via the partitioning member 16. I have. That is, the first internal space 3 a and the second internal space 3 b are adjacent to each other in the internal space 3 via the partition member 16. And the 1st internal space 3a and the 2nd internal space 3b are each sealed.

  Salts 4 are sealed in the first internal space 3a. The water 5 is directly sealed in the second internal space 3b.

  The partition component 16 is constituted by a solenoid valve. When the temperature of the solenoid valve detected by the temperature sensor reaches a predetermined operating temperature, the solenoid valve operates so that water 5 can flow from the second internal space 3b to the first internal space 3a. The predetermined operating temperature is a predetermined temperature at which the solenoid valve is operated, and may be appropriately set based on the temperature of the heating element 20 in which the cooling function of the cooling plate 150 is desired to be exhibited.

  The temperature of the cooling plate 150 rises due to the heat generated by the heating element 20 installed on the upper surface 1a, and the temperature of the partition component 16 rises. When the temperature of the partition member 16 reaches a predetermined operating temperature, the partition member 16 operates so that water 5 can flow from the second internal space 3b to the first internal space 3a, as shown in FIG. FIG. 14 shows an example in which the valve of the solenoid valve which is the partition member 16 has moved in the depth direction of the drawing. The first internal space 3a and the second internal space 3b are communicated by moving the valve of the solenoid valve which is the partition member 16.

  Thereby, the water 5 flows into the first internal space 3a, and the salt 4 and the water 5 are mixed. When the salt 4 and the water 5 are mixed, the salt 4 is dissolved in the water 5 to form a solution 8. Thus, similarly to the cooling plate 100 according to the first embodiment, an effect of cooling the heating element 20 by absorbing heat generated in the heating element 20 and transmitted to the cooling plate 100 is obtained.

  That is, the partition member 16 is a mixing unit that releases the separated state of the liquid solvent and the solid solute and mixes the solid solute and the liquid solvent, thereby dissolving the solid solute in the liquid solvent. Then, the partition member 16 is deformed to make the first internal space 3a and the second internal space 3b communicate with each other and release the separated state between the liquid solvent and the solid solute. Here, the movement of the solenoid valve corresponds to the deformation of the partition member 16.

  As described above, the cooling plate 150 according to the sixth embodiment is similar to the cooling plate 100 according to the first embodiment by enclosing the salt 4, the water 5, and the partition member 16 inside the internal space 3. In addition, a cooling plate capable of quickly and reliably cooling the heating element 20 can be obtained without complicating the structure and increasing the size.

  The configurations described in the above embodiments are examples of the content of the present invention, and the technologies of the embodiments can be combined with each other, or can be combined with another known technology. However, a part of the configuration may be omitted or changed without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 Case, 1a upper surface, 1b lower surface, 1c, 1d, 1e, 1f side surface, 2a cooling plate case main body, 2b cooling plate cover, 3 internal space, 3a first internal space, 3b second internal space, 4 salts, 5 water , 6 container, 7, 11, 12, 15, 16 partition part, 7a, 12a first partition part, 7b, 12b second partition part, 8 solution, 12a1, first metal part, 12a2 first seal part, 12b1 second Metal part, 12b2 Second seal part, 12c Partition center part, 13 Needle part, 14 Direction of inertia force, 20 Heating element, 100, 110, 120, 130, 140, 150 Cooling plate.

Claims (13)

A case with a sealed internal space,
A liquid solvent disposed in the internal space,
A solid solute that causes an endothermic reaction when dissolved in the liquid solvent by being disposed separately from the liquid solvent in the internal space;
A mixing unit for dissolving the solid solute in the liquid solvent by releasing the isolated state between the liquid solvent and the solid solute and mixing the solid solute and the liquid solvent,
A cooling plate comprising: The mixing unit is a partition member that partitions a first internal space in which the solid solute is sealed in the internal space and a second internal space in which the liquid solvent is sealed,
Deforming the partition member to communicate the first internal space and the second internal space to release the isolated state between the liquid solvent and the solid solute;
The cooling plate according to claim 1, wherein: The partition part has a metal part made of a shape memory alloy,
The metal portion is configured to allow the first internal space and the second internal space to communicate with each other by a deformation that recovers to a predetermined original shape when a predetermined recovery temperature is reached;
The cooling plate according to claim 2, wherein: The liquid solvent is stored in a container and arranged in the internal space,
The metal part pierces the container by deformation in which the metal part recovers to the predetermined original shape;
The cooling plate according to claim 3, wherein: The partition part has the metal part and a seal part made of a sealing material connected to the metal part, and when the predetermined recovery temperature is reached, the metal part recovers to a predetermined original shape. A part of the seal portion is opened to allow the first internal space and the second internal space to communicate with each other;
The cooling plate according to claim 3, wherein: The liquid solvent is stored in a container and arranged in the internal space,
The seal portion pierces the container by deformation in which the metal portion recovers to the predetermined original shape;
The cooling plate according to claim 5, wherein: The partitioning part communicates the first internal space and the second internal space by breaking and deforming when the pressure of the second internal space becomes equal to or higher than a predetermined breaking pressure due to expansion of the liquid solvent. To make
The cooling plate according to claim 2, wherein: The liquid solvent is stored in a container that bursts when a predetermined burst pressure equal to or lower than the predetermined burst pressure is applied, and is disposed in the internal space.
The cooling plate according to claim 7, wherein: The partition component is deteriorated when a predetermined deterioration temperature is reached, and connects the first internal space and the second internal space,
The cooling plate according to claim 2, wherein: When the liquid solvent reaches a predetermined container deterioration temperature equal to or lower than the predetermined deterioration temperature, the liquid solvent is stored in a container that is deteriorated and allows the liquid solvent to flow into the second internal space, and is disposed in the internal space. thing,
The cooling plate according to claim 9, wherein: The partition member is an electromagnetic valve, which operates when a predetermined operating temperature is reached, to communicate the first internal space and the second internal space;
The cooling plate according to claim 2, wherein: Providing a protrusion in the internal space,
The liquid solvent is stored in a container,
The container moves by applying an inertial force to move the container in the direction of the protrusion in the internal space, and the protrusion breaks through the container.
The cooling plate according to claim 1, wherein: The solid solute is a salt,
The liquid solvent is water,
The cooling plate according to claim 1, wherein:

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