Boiling-type cooling device

Abstract

This boiling-type cooling device (100) comprises: a boiling unit (1) that vaporizes an internal refrigerant (3); and a condensation unit (2) that condenses the refrigerant and returns the refrigerant to the boiling unit. The condensation unit comprises: an external gas flow path (20) through which an external gas can flow; a refrigerant condensation flow path (21) in which the refrigerant condenses; an inlet side refrigerant flow path (22) that is connected to the boiling unit and one end in a first direction of the refrigerant condensation flow path, and through which the refrigerant can flow; and an outlet side refrigerant flow path (23) that is connected to the other end in the first direction of the refrigerant condensation flow path and the boiling unit 1, and through which the refrigerant can flow. The cross sectional area of the inlet side refrigerant flow path is greater than the cross sectional area of the outlet side refrigerant flow path.

Description

Boiling type cooling device

[0001] The present invention relates to a boiling type cooling device, and more particularly to a boiling type cooling device having a boiling section that vaporizes a refrigerant and a condensing section that condenses the refrigerant and returns the condensed refrigerant to the boiling section.

[0002] A known boiling-type cooling device includes a boiling section that vaporizes a refrigerant and a condensing section that condenses the refrigerant and returns the condensed refrigerant to the boiling section. In a boiling-type cooling device (boiling cooler) that includes a boiling section and a condensing section, the refrigerant vaporized in the boiling section is condensed in the condensing section to cool a heat-generating element provided outside the boiling-type cooling device. In this case, if the refrigerant does not circulate smoothly within the boiling-type cooling device, a shortage of liquid-phase refrigerant occurs in the boiling section, resulting in a decrease in the cooling performance of the boiling-type cooling device. Therefore, a boiling-type cooling device that can suppress the decrease in cooling performance is desired.

[0003] Japanese Patent Application Laid-Open No. 2024-035713

[0004] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a boiling type cooling device that can suppress a decrease in cooling performance.

[0005] In order to achieve the above object, the boiling type cooling device of the present invention includes a boiling section that vaporizes an internal refrigerant by heat absorbed from the outside, and a condensing section that condenses the vaporized refrigerant and returns the condensed refrigerant to the boiling section, the condensing section having an external gas flow path that is a flow path through which external gas can flow, a refrigerant condensation flow path in which the refrigerant condenses inside, an inlet-side refrigerant flow path that is connected to the boiling section and one side of the refrigerant condensation flow path in a first direction that is a direction along the refrigerant condensation flow path and through which the refrigerant can flow, and an outlet-side refrigerant flow path that is connected to the other side of the refrigerant condensation flow path in the first direction and the boiling section and through which the refrigerant can flow, and the cross-sectional area of ​​the inlet-side refrigerant flow path is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path.

[0006] According to the boiling type cooling device of the present invention, it is possible to suppress a decrease in cooling performance.

[0007] FIG. 1 is a perspective view showing an example of a boiling type cooling device according to a first embodiment of the present invention. FIG. 2 is a view showing a boiling section and a condensing section according to the first embodiment of the present invention, viewed in the Y direction. FIG. 3 is a view showing a cross section of the boiling type cooling device according to the first embodiment of the present invention, taken along line III-III. FIG. 4 is a view showing a cross section of the boiling type cooling device according to the first embodiment of the present invention, taken along line IV-IV. FIG. 5 is a view showing a cross section of the boiling type cooling device according to the first embodiment of the present invention, taken along line V-V. FIG. 6 is a view showing a cross section of the boiling type cooling device according to the first embodiment of the present invention, taken along line VI-VI. FIG. 7 is a view showing a boiling section and a condensing section according to a second embodiment of the present invention, viewed in the Y direction. FIG. 8 is a view showing a cross section of the boiling type cooling device according to the second embodiment of the present invention, taken along line IX-IX. FIG. 9 is a view showing a boiling section and a condensing section according to a first modified embodiment of the present invention, viewed in the Y direction. FIG. 10 is a view showing a cross section of the boiling type cooling device according to the first modified embodiment of the present invention, taken along line XII-XII. FIG. 11 is a view showing a cross section of the boiling type cooling device according to the first modified embodiment of the present invention, taken along line XII-XII. FIG. 12 is a view showing a cross section of the boiling type cooling device according to the second modified embodiment of the present invention, taken along the X direction. FIG. 13 is a view showing a cross section of the boiling type cooling device according to the third modified embodiment of the present invention, viewed in the Y direction. FIG. 1 is a diagram showing a cross section along the X direction of a boiling type cooling device according to a third modified example of the present invention. FIG. 2 is a diagram showing a cross section along the XVI-XVI line of a boiling type cooling device according to a third modified example of the present invention. FIG. 3 is a diagram showing a cross section along the XVII-XVII line of a boiling type cooling device according to a third modified example of the present invention. FIG. 4 is a diagram showing a cross section along the X direction of a boiling type cooling device according to a fourth modified example of the present invention. FIG. 5 is a perspective view showing an example of a boiling type cooling device according to a fifth modified example of the present invention. FIG. 6 is a diagram showing a cross section along the C direction of a boiling type cooling device according to a fifth modified example of the present invention.

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals will be used to designate the same components, and the description thereof will be omitted.

[0009] 1 to 6, the configuration of a boiling-type cooling device 100 according to a first embodiment will be described. The boiling-type cooling device 100 is a cooling device that absorbs heat from a heat-generating element HS and releases the absorbed heat to the outside. The heat-generating element HS is, for example, a CPU (Central Processing Unit).

[0010] FIG. 1 is a perspective view showing an example of a boiling type cooling device 100 according to a first embodiment of the present invention. The boiling type cooling device 100 includes a boiling section 1 and a condensing section 2. The boiling section 1 and the condensing section 2 have an airtight space that is in communication with each other. A refrigerant 3 is accommodated in the space. The refrigerant 3 is, for example, a fluorocarbon, a hydrocarbon, or water. In the first embodiment, the boiling section 1 and the condensing section 2 are integral. That is, the boiling section 1 and the condensing section 2 are adjacent to each other (in contact with each other).

[0011] The boiling portion 1 is a flat metal member made of, for example, aluminum or an aluminum alloy, and vaporizes the refrigerant 3 therein by absorbing heat from the outside.

[0012] The condenser section 2 is a box-shaped member made of a flat metal member, such as aluminum or an aluminum alloy. The condenser section 2 condenses the vaporized refrigerant 3 and returns the condensed refrigerant 3 to the boiling section 1. The condenser section 2 is configured as a plate-fin type heat exchanger.

[0013] The boiling portion 1 includes an attachment portion 10 and a storage portion 11 .

[0014] The mounting portion 10 is a flat metal member. The mounting portion 10 is made of, for example, aluminum or an aluminum alloy. The mounting portion 10 has a plate-like shape extending horizontally. The mounting portion 10 is joined to the accommodation portion 11. The mounting portion 10 includes a mounting surface 10a and a surface 10b. The mounting surface 10a and the surface 10b face each other. The mounting surface 10a is the surface to which the heating element HS is attached. The surface 10b is the surface of the mounting portion 10 that has the boiling surface portion 12. The boiling surface portion 12 is a flat metal member. The boiling surface portion 12 is made of, for example, aluminum or an aluminum alloy. The boiling surface portion 12 has irregularities that serve as starting points for nucleate boiling of the refrigerant 3.

[0015] The accommodation portion 11 is a flat metal member. The accommodation portion 11 is made of, for example, aluminum or an aluminum alloy. The accommodation portion 11 accommodates the liquid-phase refrigerant 3. The accommodation portion 11 has a surface that is joined to the attachment portion 10. The accommodation portion 11 is a concave member whose bottom surface is the surface that is joined to the attachment portion 10.

[0016] The condenser 2 has an external gas flow path 20, a refrigerant condensation flow path 21, and a bottom surface 2a. The condenser 2 may have a plurality of external gas flow paths 20. The condenser 2 may have a plurality of refrigerant condensation flow paths 21. In FIG. 1 , the condenser 2 has four external gas flow paths 20 and three refrigerant condensation flow paths 21.

[0017] The external gas flow path 20 is a flow path through which external gas can flow. Both ends of the external gas flow path 20 are open to the outside. The external gas flow path 20 penetrates the boiling type cooling device 100 in the Y direction. Furthermore, the external gas flow path 20 does not communicate with the refrigerant condensation flow path 21 and the boiling section 1 (accommodation section 11).

[0018] The refrigerant condensation channel 21 is a channel in which the refrigerant 3 condenses.

[0019] The bottom surface 2 a is the surface that comes into contact with the boiling portion 1 .

[0020] Hereinafter, the direction perpendicular to the bottom surface 2a is referred to as the Z direction. One of the Z directions is referred to as the Z1 direction, and the other is referred to as the Z2 direction. Gravity acts in the Z2 direction. The direction along the refrigerant condensation channel 21 is referred to as the X direction. The direction perpendicular to the X and Z directions is referred to as the Y direction. Note that the "first direction" in the claims is an example of the X direction. The "height direction" is an example of the Z direction.

[0021] FIG. 2 is a view of the boiling section 1 and the condensing section 2 according to the first embodiment of the present invention, viewed in the Y direction.

[0022] The external gas flow path partitioning member 24 is a member that partitions the space inside the condenser 2 into external gas flow paths 20. The external gas flow path partitioning member 24 includes a partition plate 24a, a top plate 24b, one side spacer bar 24c, and the other side spacer bar 24d.

[0023] The partition plate 24a is a flat metal member. The partition plate 24a is made of, for example, aluminum or an aluminum alloy. The partition plate 24a may be a member having a core material and brazing material layers provided on both sides of the core material. That is, the partition plate 24a may be a brazing sheet. The partition plate 24a divides the internal space of the condenser 2 into an external gas flow path 20 and a refrigerant condensation flow path 21.

[0024] The top plate 24b is a flat metal member. The top plate 24b is made of, for example, aluminum or an aluminum alloy. The top plate 24b may be a member having a core material and brazing material layers provided on both sides of the core material. In other words, the top plate 24b may be a brazing sheet. The top plate 24b is disposed at the top of the condenser section 2.

[0025] The one-side spacer bar 24c is a columnar metal member made of, for example, aluminum or an aluminum alloy. The one-side spacer bar 24c is disposed on one side of the condenser section 2 in the X direction. The one-side spacer bar 24c forms one wall of the external gas flow path 20 in the X direction.

[0026] The other-side spacer bar 24d is a columnar metal member made of, for example, aluminum or an aluminum alloy. The other-side spacer bar 24d is disposed on the other side of the condenser section 2 in the X direction. The other-side spacer bar 24d forms the other wall of the external gas flow path 20 in the X direction.

[0027] Corrugated fins 20a extending in the Y direction are arranged in the external gas flow path 20. The corrugated fins 20a are, for example, of any one of plain, perforated, herringbone, louvered, and serrated types.

[0028] FIG. 3 is a cross-sectional view taken along line III-III of the boiling type cooling device 100 according to the first embodiment of the present invention.

[0029] The housing 11 has a bottom surface 11a and a peripheral wall 11b. The bottom surface 11a is provided with a hole 11d.

[0030] The bottom surface portion 11a is a surface of the housing portion 11 that is disposed in the other direction (Z2 direction) of the Z direction.

[0031] The peripheral wall 11b is a surface of the housing portion 11 that is disposed in a direction other than one of the Z directions (Z1 direction) and the other direction (Z2 direction). The peripheral wall 11b has a cylindrical shape.

[0032] The hole 11d is a hole that penetrates the bottom surface portion 11a in the Z direction. The hole 11d is closed by the attachment portion 10.

[0033] The boiling surface portion 12 is disposed in the hole 11d so as to fit inside the hole 11d. Inside the hole 11d, the boiling surface portion 12 is in contact with the refrigerant 3 in a liquid phase.

[0034] The accommodation section 11 has a communication section 11 c that is connected to the condensation section 2 .

[0035] The communication portions 11c are connection ports (openings) and are provided on one and the other sides of the accommodation portion 11 in the X direction. The communication portions 11c are formed by a partition plate 24a that separates the accommodation portion 11 from the condensation portion 2.

[0036] The liquid level 3a is the boundary surface between the liquid-phase refrigerant 3 and the gas (air) in the accommodation portion 11. The liquid level 3a is located in the other direction in the Z direction than the communication portion 11c.

[0037] The refrigerant condensation channel dividing member 25 is a member that divides the space inside the condenser 2 into refrigerant condensation channels 21. The refrigerant condensation channel dividing member 25 includes a partition plate 24a and a frame-shaped member 25a.

[0038] The frame-shaped member 25a is a metal frame-shaped member made of, for example, aluminum or an aluminum alloy. Details of the frame-shaped member 25a will be described later.

[0039] The plurality of refrigerant condensation channel partitioning members 25 and the plurality of external gas channel partitioning members 24 are arranged adjacent to each other in the Z direction. In Fig. 3, the plurality of refrigerant condensation channel partitioning members 25 and the plurality of external gas channel partitioning members 24 are arranged adjacent to each other alternately in the Z direction. The refrigerant condensation channel partitioning members 25 and the external gas channel partitioning members 24 are arranged adjacent to each other in the Z direction so that three refrigerant condensation channels 21 and four external gas channels 20 are arranged alternately in the Z direction.

[0040] The plurality of external gas flow paths 20 each have the same height H1, which is the length in the Z direction, and the same width W3, which is the width in the X direction.

[0041] The height H2 of each of the plurality of refrigerant condensation channels 21 is equal to one another and is smaller than the height H1.

[0042] The condenser section 2 has an inlet-side refrigerant flow path 22 and an outlet-side refrigerant flow path 23 .

[0043] The inlet-side refrigerant flow path 22 is a flow path through which the refrigerant 3 can flow. The inlet-side refrigerant flow path 22 is connected to the boiling portion 1 and one of the refrigerant condensing flow paths 21 in the X direction. The Z2-direction end of the refrigerant condensing flow path 21 is connected to the boiling portion 1 via one of the communication portions 11c in the X direction. The inlet-side refrigerant flow path 22 serves to supply the gas-phase refrigerant 3 vaporized in the boiling portion 1 from the boiling portion 1 to each refrigerant condensing flow path 21.

[0044] The inlet-side refrigerant flow path partition member 26 is a member that partitions the space inside the condenser 2 into inlet-side refrigerant flow paths 22. The inlet-side refrigerant flow path partition member 26 includes a partition plate 24a, a top plate 24b, one-side spacer bar 24c, and a frame-shaped member 25a.

[0045] The outlet-side refrigerant flow path 23 is a flow path through which the refrigerant 3 can flow. The outlet-side refrigerant flow path 23 is connected to the other end of the refrigerant condensing flow path 21 in the X direction and to the boiling portion 1. The Z2-direction end of the outlet-side refrigerant flow path 23 is connected to the boiling portion 1 via the other communication portion 11c in the X direction. The outlet-side refrigerant flow path 23 serves to supply the liquid-phase refrigerant 3 condensed in each refrigerant condensing flow path 21 from the condensing portion 2 to the boiling portion 1.

[0046] The outlet-side refrigerant flow path partition member 27 is a member that partitions the space inside the condenser 2 into outlet-side refrigerant flow paths 23. The outlet-side refrigerant flow path partition member 27 includes a partition plate 24a, a top plate 24b, a second-side spacer bar 24d, and a frame-shaped member 25a.

[0047] The cross-sectional area of ​​the inlet-side refrigerant flow path 22 is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path 23. Specifically, a first flow path width W1, which is the width in the X direction of the inlet-side refrigerant flow path 22, is larger than a second flow path width W2, which is the width in the X direction of the outlet-side refrigerant flow path 23. The first flow path width W1 is at least twice the second flow path width W2.

[0048] The first flow path width W1 at least at a position closest to the boiling portion 1 of the inlet-side refrigerant flow path 22 is larger than the second flow path width W2 at least at a position closest to the boiling portion 1 of the outlet-side refrigerant flow path 23. In Fig. 3, the first flow path width W1 is equal to each other at each position in the Z direction. Also, the second flow path width W2 is equal to each other at each position in the Z direction.

[0049] When heat absorbed from the heating element HS is transferred to the boiling surface portion 12 via the mounting portion 10, the liquid-phase refrigerant 3 stored in the accommodation portion 11 is heated and vaporized. The vaporized refrigerant 3 moves through the inlet-side refrigerant flow path 22 into the three refrigerant condensation flow paths 21. In each of the three refrigerant condensation flow paths 21, the vaporized refrigerant 3 is cooled and condensed by heat exchange with an external fluid flowing through the adjacent external gas flow path 20. The external fluid is a fluid that cools the refrigerant 3, such as air.

[0050] The condensed refrigerant 3 moves through the three refrigerant condensation channels 21 and returns to the accommodation section 11 through the outlet-side refrigerant channel 23. In this way, the refrigerant 3 sealed in the boiling type cooling device 100 absorbs heat from the heating element HS and vaporizes, and condenses in the condensing section 2, thereby circulating between the boiling section 1 and the condensing section 2. As the refrigerant 3 circulates, its state changing, the heating element HS is cooled.

[0051] (Refrigerant Condensation Channel) FIG. 4 is a cross-sectional view taken along line IV-IV of the boiling type cooling device 100 according to the first embodiment of the present invention.

[0052] Refrigerant condensation channel 21 is a channel in which the space inside condenser 2 is partitioned by partition plate 24a and frame-shaped member 25a. Refrigerant condensation channel 21 also includes corrugated fins 21a that are integrated with partition plate 24a and frame-shaped member 25a.

[0053] The corrugated fins 21a are, for example, of any one of plain type, perforated type, herringbone type, louver type, and serrated type.

[0054] Furthermore, the width W4 of the opening in frame-shaped member 25a in the X direction is larger than the width W5 of partition plate 24a in the X direction. When partitioning refrigerant condensation channel 21, partition plate 24a is arranged on frame-shaped member 25a so that one-side opening 31 and other-side opening 32 are formed on one and other sides of refrigerant condensation channel 21 in the X direction. In other words, one-side opening 31 and other-side opening 32 are formed by the difference between width W5 and width W4.

[0055] The width W6 of the first opening 31 in the X direction is equal to the first flow path width W1. The length L1 of the first opening 31 in the Y direction is equal to the length of the inlet refrigerant flow path 22 in the Y direction.

[0056] The width W7 of the second opening 32 in the X direction is equal to the second flow path width W2. The length L2 of the second opening 32 in the Y direction is equal to the length of the outlet refrigerant flow path 23 in the Y direction.

[0057] (External Gas Flow Path) FIG. 5 is a cross-sectional view taken along line VV of the boiling type cooling device 100 according to the first embodiment of the present invention.

[0058] The external gas flow path 20 is a flow path in which the space inside the condenser 2 is partitioned by two partition plates 24a, one spacer bar 24c, and the other spacer bar 24d. The external gas flow path 20 on the uppermost side in the Z direction is a flow path in which the space inside the condenser 2 is partitioned by one partition plate 24a, one top plate 24b, one spacer bar 24c, and the other spacer bar 24d.

[0059] The corrugated fin 20a is integrated with the partition plate 24a, one side spacer bar 24c, and the other side spacer bar 24d.

[0060] Furthermore, a one-side opening 33 and an other-side opening 34 are formed on one side and the other side of the external gas flow path 20 in the X direction.

[0061] The one-side opening 33 is an opening provided in the one-side spacer bar 24c. The one-side opening 33 penetrates the one-side spacer bar 24c in the Z direction. The one-side opening 33 is disposed at a position corresponding to the one-side opening 31.

[0062] The width W8 of the first opening 33 in the X direction is equal to the first flow path width W1. The width W8 is also equal to the width W6. The length L3 of the first opening 33 in the Y direction is also equal to the length of the inlet refrigerant flow path 22 in the Y direction.

[0063] The other-side opening 34 is an opening provided in the other-side spacer bar 24d and penetrates the other-side spacer bar 24d in the Z direction.

[0064] The width W9 of the other-side opening 34 in the X direction is equal to the second flow path width W2. The width W9 is also equal to the width W7. The length L4 of the other-side opening 34 in the Y direction is also equal to the length of the outlet-side refrigerant flow path 23 in the Y direction. The length L4 is also equal to the length L3.

[0065] The one-side spacer bar 24c is provided with a first partition member 28 that is a member that divides the inlet-side refrigerant flow path 22 into a plurality of sections.

[0066] The first partition member 28 is a member that divides the one-side opening 33 into a plurality of opening portions 33a aligned in the Y direction. The first partition member 28 is joined to the one-side spacer bar 24c by brazing, welding, or the like. The first partition member 28 may be formed integrally with the one-side spacer bar 24c. In other words, the first partition member 28 may be formed as a beam portion that remains without through holes formed when the plurality of opening portions 33a are formed in the one-side spacer bar 24c.

[0067] The width W10 in the X direction of each of the plurality of openings 33a is equal to the width W8, and the length L5 in the Y direction of each of the plurality of openings 33a is smaller than the length L3.

[0068] The other spacer bar 24d is provided with a second partition member 29 that divides the outlet-side refrigerant flow path 23 into a plurality of sections.

[0069] The second partition member 29 is a member that divides the other-side opening 34 into multiple opening portions 34a lined up in the Y direction. The second partition member 29 is joined to the other-side spacer bar 24d by brazing, welding, or the like. The second partition member 29 may be formed integrally with the other-side spacer bar 24d. In other words, the second partition member 29 may be formed as a beam portion that remains without through holes formed when the multiple opening portions 34a are formed in the other-side spacer bar 24d.

[0070] The width W11 in the X direction of each of the plurality of openings 34a is equal to the width W9 of the other-side opening 34. The length L6 in the Y direction of each of the plurality of openings 34a is smaller than the length L4. The length L6 is equal to the length L5.

[0071] (Configuration of Partition Plate) FIG. 6 is a diagram showing a cross section of the boiling type cooling device 100 according to the first embodiment of the present invention, taken along line VI-VI.

[0072] 6 shows the partition plate 24a disposed on the other side in the Z direction of the uppermost external gas flow path 20 in the Z direction. One-side opening 35 and other-side opening 36 are formed on one side and the other side in the X direction of the partition plate 24a.

[0073] The one-side opening 35 penetrates the partition plate 24a in the Z direction. The one-side opening 35 is disposed at a position corresponding to the one-side openings 31 and 33.

[0074] The width W12 of the first opening 35 in the X direction is equal to the first flow path width W1, width W6, and width W8. The length L7 of the first opening 35 in the Y direction is equal to the length of the inlet refrigerant flow path 22 in the Y direction.

[0075] The other-side opening 36 penetrates the partition plate 24a in the Z direction. The other-side opening 36 is disposed at a position corresponding to the other-side openings 32 and 34.

[0076] The width W13 of the other-side opening 36 in the X direction is equal to the second flow path width W2, the width W7 of the other-side opening 32, and the width W9 of the other-side opening 34. The length L8 of the other-side opening 37 in the Y direction is equal to the length of the outlet-side refrigerant flow path 23 in the Y direction.

[0077] Similarly to the one-side opening 33, the one-side opening 35 is partitioned into a plurality of opening portions 35a by the first partition member 28.

[0078] Similarly to the other-side opening 34, the other-side opening 37 is partitioned by the second partition member 29 into a plurality of opening portions 36a.

[0079] The width W14 in the X direction of each of the plurality of openings 35a is equal to the width W12 in the X direction of the one-side opening 35. Furthermore, the length L9 in the Y direction of each of the plurality of openings 35a is smaller than the length L7 in the Y direction of the one-side opening 35.

[0080] The width W15 in the X direction of each of the plurality of openings 36a is equal to the width W13. The length L10 in the Y direction of each of the plurality of openings 36a is smaller than the length L8. The length L10 is equal to the length L9 in the Y direction of each of the plurality of openings 35a.

[0081] That is, the space within the internal space of the condenser section 2 that is partitioned by the one-side opening 31 , the one-side opening 33 , and the one-side opening 35 serves as the inlet-side refrigerant flow path 22 .

[0082] Furthermore, the space within the interior space of the condenser section 2 that is partitioned by the other-side opening 32 , the other-side opening 34 , and the other-side opening 37 serves as an outlet-side refrigerant flow path 23 .

[0083] (Effects of First Embodiment) In the first embodiment, the following effects can be obtained.

[0084] (First Effect of First Embodiment) According to the boiling type cooling device 100 of the first embodiment, the cross-sectional area of ​​the inlet-side refrigerant flow path 22 is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path 23, so that the pressure loss in the inlet-side refrigerant flow path 22 when the vaporized refrigerant 3 flows can be made smaller than the pressure loss in the outlet-side refrigerant flow path 23. Therefore, the vaporized refrigerant 3 is more likely to flow into the inlet-side refrigerant flow path 22 than into the outlet-side refrigerant flow path 23. Therefore, it is possible to generate a circulation in which the refrigerant 3 vaporized in the boiling unit 1 flows through the inlet-side refrigerant flow path 22, the refrigerant condensation flow path 21, and the outlet-side refrigerant flow path 23 in this order inside the boiling type cooling device 100, and then returns to the boiling unit 1. This makes it possible to suppress a decrease in cooling performance.

[0085] (Second Effect of First Embodiment) Furthermore, according to the boiling type cooling device 100 of the first embodiment, the first flow path width W1 is larger than the second flow path width W2. Therefore, by making the lengths of the inlet-side refrigerant flow path 22 and the outlet-side refrigerant flow path 23 equal in the Y direction (depth direction), the cross-sectional area of ​​the inlet-side refrigerant flow path 22 can be made larger than the cross-sectional area of ​​the outlet-side refrigerant flow path 23. As a result, when the vaporized refrigerant 3 flows, the pressure loss in the space connecting the boiling portion 1 and one side of the refrigerant condensation flow path 21 in the X direction can be made smaller than the pressure loss in the space connecting the other side of the refrigerant condensation flow path 21 in the X direction and the boiling portion 1. Therefore, a decrease in cooling performance can be suppressed.

[0086] (Third Effect of First Embodiment) According to the boiling type cooling device 100 of the first embodiment, since the first flow path width W1 is at least twice the second flow path width W2, the pressure loss in the space connecting the boiling portion 1 and one side of the refrigerant condensation flow path 21 in the X direction when the vaporized refrigerant 3 flows can be effectively reduced compared to the pressure loss in the space connecting the other side of the refrigerant condensation flow path 21 in the X direction and the boiling portion 1. Therefore, a decrease in cooling performance can be suppressed.

[0087] (Fourth Effect of First Embodiment) Furthermore, according to the boiling type cooling device 100 of the first embodiment, since the inlet-side refrigerant flow path partition member 26 is partitioned by the first partition member 28, the mechanical strength of the condenser section 2 can be improved compared to a configuration in which the inlet-side refrigerant flow path partition member 26 is not partitioned by the first partition member 28. Furthermore, since the outlet-side refrigerant flow path partition member 27 is partitioned by the second partition member 29, the mechanical strength of the condenser section 2 can be improved compared to a configuration in which the outlet-side refrigerant flow path partition member 27 is not partitioned by the second partition member 29. As a result, the mechanical strength of the condenser section 2 can be improved.

[0088] (Fifth Advantage of First Embodiment) Furthermore, according to the boiling type cooling device 100 of the first embodiment, since the first flow path width W1 at least at the position closest to the boiling portion 1 is larger than the second flow path width W2 at least at the position closest to the boiling portion 1, the pressure loss throughout the inlet-side refrigerant flow path 22 when the vaporized refrigerant 3 flows can be made smaller than the pressure loss throughout the outlet-side refrigerant flow path 23. As a result, the refrigerant 3 can be circulated in a fixed direction inside the boiling type cooling device 100. This makes it possible to suppress a decrease in cooling performance.

[0089] (Sixth Advantage of First Embodiment) According to the boiling type cooling device 100 of the first embodiment, the boiling type cooling device 100 can be manufactured using a common partition plate 24a in which the first flow path width W1 and the second flow path width W2 are equal to each other. As a result, the productivity of the boiling type cooling device 100 can be improved.

[0090] Second Embodiment Next, the configuration of a boiling type cooling device 200 according to a second embodiment of the present invention will be described with reference to FIGS.

[0091] FIG. 7 is a view of the boiling section 1 and the condensing section 201 according to the second embodiment of the present invention, viewed in the Y direction.

[0092] The condenser 201 is a box-shaped member made of a flat metal member, such as aluminum or an aluminum alloy, and has a plurality of external gas flow paths 20 and one external gas flow path 202.

[0093] The external gas flow path 202 is a flow path through which external gas can flow. The external gas flow path 202 is located on the uppermost side in the Z direction of the condenser section 201. The width W16 of the external gas flow path 202 in the X direction is greater than the width W3.

[0094] The external gas flow path 202 is a flow path in which the space inside the condenser section 201 is partitioned by the partition plate 24 a, the top plate 24 b, the one-side spacer bar 24 e, and the other-side spacer bar 24 f. The external gas flow path 202 is a flow path in which the space inside the condenser section 201 is partitioned by the external gas flow path partitioning member 24 so that the other portion of the external gas flow path 202 in the X direction is larger in the X direction than the other portion of the external gas flow path 20 in the X direction.

[0095] The one-side spacer bar 24e is a columnar metal member made of, for example, aluminum or an aluminum alloy. The one-side spacer bar 24e is disposed on one side of the condenser section 201 in the X direction. The one-side spacer bar 24e forms one wall of the external gas flow path 202 in the X direction.

[0096] The other-side spacer bar 24f is a columnar metal member made of, for example, aluminum or an aluminum alloy. The other-side spacer bar 24f is disposed on the other side of the condenser section 201 in the X direction. The other-side spacer bar 24f forms the other wall of the external gas flow path 202 in the X direction.

[0097] 8 is a cross-sectional view of a boiling type cooling device 200 according to a second embodiment of the present invention, taken along the X direction. The height H3 of the external gas flow path 202 in the Z direction is smaller than the height H1. The height H3 is larger than the height H2.

[0098] (External Gas Flow Path on the Top Side) FIG. 9 is a cross-sectional view taken along line IX-IX of a boiling type cooling device 200 according to a second embodiment of the present invention.

[0099] Unlike the one-side spacer bar 24c, the one-side spacer bar 24e does not have an opening.

[0100] The width W19 of the one-side spacer bar 24e in the X direction is greater than the first flow path width W1. The width W19 is equal to the width W17 of the one-side spacer bar 24c in the X direction. That is, the one-side spacer bar 24e has the same configuration as the one-side spacer bar 24c, except that no opening is provided.

[0101] The other-side spacer bar 24f is different from the other-side spacer bar 24d in that it does not have an opening.

[0102] That is, in the condenser section 201, the inlet side refrigerant flow path 22 and the outlet side refrigerant flow path 23 are connected only up to the position of the refrigerant condensation flow path 21 located on the other side of the external gas flow path 202 in the Z direction.

[0103] The width W20 of the other-side spacer bar 24f in the X direction is smaller than the second flow path width W2. The width W20 is also smaller than the width W18 of the other-side spacer bar 24d in the X direction.

[0104] The other configurations of the second embodiment are similar to those of the first embodiment.

[0105] (Effects of Second Embodiment) The boiling type cooling device 200 according to the second embodiment can provide the following effects.

[0106] According to the boiling type cooling device 200 of the second embodiment, the width W16 can be increased. Therefore, compared to a configuration in which the width W16 is equal to the width W3, the total flow path area of ​​the external gas flow path 202 and the external gas flow path 20 can be increased. As a result, the cooling performance of the boiling type cooling device 200 can be improved.

[0107] Other effects of the second embodiment are similar to those of the first embodiment.

[0108] [Modifications] (First Modification) A first modification will be described with reference to Fig. 10 to Fig. 12. Fig. 10 is a view of the boiling section 1 and the condensation section 301 according to the first modification of the present invention, viewed in the Y direction.

[0109] In the first modification, the condenser section 301 has an external gas flow path 20 and an external gas flow path 302 .

[0110] The external gas flow path 302 is a flow path through which external gas can pass. The external gas flow path 302 is an external gas flow path located on the uppermost side in the Z direction. The external gas flow path 302 is a flow path in which the internal space of the condenser section 301 is partitioned by the partition plate 24 a, the top plate 24 b, the one-side spacer bar 24 g, and the other-side spacer bar 24 f.

[0111] The width W21 in the X direction of the external gas flow path 302 is larger than the width W3 in the X direction of the external gas flow path 20. In addition, the width W21 is larger than the width W16 in the X direction of the external gas flow path 202 of the boiling type cooling device 200 according to the second embodiment.

[0112] The one-side spacer bar 24g is a columnar metal member made of, for example, aluminum or an aluminum alloy. The one-side spacer bar 24g is disposed on one side of the condenser section 301 in the X direction. The one-side spacer bar 24g forms one wall of the external gas flow path 302 in the X direction.

[0113] FIG. 11 is a diagram showing a cross section along the X direction of a boiling type cooling device 300 according to a first modified example of the present invention.

[0114] The height H4 in the Z direction of the external gas flow path 302 is smaller than the height H1. The height H4 is larger than the height H2. The height H4 is also equal to the height H3 in the Z direction of the external gas flow path 202 of the boiling type cooling device 200 of the second embodiment.

[0115] FIG. 12 is a cross-sectional view taken along line XII-XII of a boiling type cooling device 300 according to a first modified example of the present invention.

[0116] Unlike the one-side spacer bar 24c, the one-side spacer bar 24g does not have an opening.

[0117] That is, in the condenser section 301, the inlet side refrigerant flow path 22 and the outlet side refrigerant flow path 23 are connected only up to the position of the refrigerant condensation flow path 21 located on the other side of the external gas flow path 302 in the Z direction.

[0118] The width W22 of the one-side spacer bar 24g in the X direction is smaller than the first flow path width W1. The width W22 is also smaller than the width W19 of the one-side spacer bar 24e in the X direction of the boiling type cooling device 200 of the second embodiment.

[0119] The other configurations of the first modified example are similar to those of the second embodiment.

[0120] (Effects of the First Modification) According to the boiling type cooling device 300 of the first modification, the width W21 in the X direction of the external gas flow path 302 on the uppermost side can be made larger than the width W16 in the X direction of the external gas flow path 202 on the uppermost side of the boiling type cooling device 200 of the second embodiment. As a result, the total flow path area of ​​the external gas flow paths 302 and 20 can be made larger than in a configuration in which the width W21 in the X direction of the external gas flow path 302 on the uppermost side is equal to the width W3 in the X direction of the external gas flow paths 20 other than the uppermost side. As a result, the cooling performance of the boiling type cooling device 300 can be further improved.

[0121] (Second Modification) A second modification will be described with reference to Fig. 13. Fig. 13 is a diagram showing a cross section along the X direction of a boiling type cooling device 400 according to a second modification of the present invention.

[0122] The condenser 401 is a box-shaped member made of a flat metal member, such as aluminum or an aluminum alloy. In the second modification, the condenser 401 has an external gas flow path 402 on the uppermost side in the Z direction.

[0123] The external gas flow path 402 is a flow path through which external gas can pass. The external gas flow path 402 is a flow path in which the space inside the condenser section 401 is partitioned by the partition plate 24 a, the top plate 24 b, the one-side spacer bar 24 h, and the other-side spacer bar 24 i. The height H5 of the external gas flow path 402 in the Z direction is smaller than the height H1 of the uppermost external gas flow path 20 in the Z direction.

[0124] The one-side spacer bar 24h is a columnar metal member. The one-side spacer bar 24h is made of, for example, aluminum or an aluminum alloy. The height H5 in the Z direction of the one-side spacer bar 24h is smaller than the height H1 in the Z direction of the one-side spacer bar 24c. Except for the difference in the height in the Z direction, the one-side spacer bar 24h has the same configuration as the one-side spacer bar 24c.

[0125] The other-side spacer bar 24i is a columnar metal member. The other-side spacer bar 24i is made of, for example, aluminum or an aluminum alloy. The height H5 of the other-side spacer bar 24i in the Z direction is smaller than the height H1 of the other-side spacer bar 24d in the Z direction. Except for the difference in the height in the Z direction, the other-side spacer bar 24i has the same configuration as the other-side spacer bar 24d.

[0126] The other configurations of the second modified example are similar to those of the first embodiment.

[0127] (Effects of the Second Modification) According to the boiling type cooling device 400 of the second modification, the height H5 in the Z direction of the uppermost external gas flow path 402 is smaller than the height H1 in the Z direction of the external gas flow paths 20 other than the uppermost one, so the height in the Z direction of the condenser 401 can be made smaller than in a configuration in which the heights in the Z direction of all the external gas flow paths are the same. As a result, the height in the Z direction of the boiling type cooling device 400 can be made smaller.

[0128] (Third Modification) A third modification will be described with reference to Figures 14 to 16. Figure 14 is a view of a boiling section 1 and a condensing section 501 according to a third modification of the present invention, viewed in the Y direction.

[0129] The condenser 501 is a box-shaped member made of a flat metal member, such as aluminum or an aluminum alloy, and has an external gas flow path 502 and a refrigerant condensation flow path 503.

[0130] The external gas flow path 502 is a flow path through which external gas can pass. The external gas flow path 502 on the uppermost side in the Z direction in the third modified example is a flow path in which the internal space of the condenser section 501 is partitioned by a partition plate 504, a top plate 24b, one-side spacer bar 24c, and the other-side spacer bar 24j. The external gas flow paths 502 other than the uppermost side in the Z direction are flow paths in which the internal space of the condenser section 501 is partitioned by two partition plates 504, one-side spacer bar 24c, and the other-side spacer bar 24j.

[0131] The partition plate 504 is a flat metal member made of, for example, aluminum or an aluminum alloy. The partition plate 504 may also be a brazing sheet.

[0132] The other-side spacer bar 24j is a columnar metal member made of, for example, aluminum or an aluminum alloy. The other-side spacer bar 24j is disposed on the other side of the condenser section 501 in the X direction. The other-side spacer bar 24j forms the other wall of the external gas flow path 502 in the X direction.

[0133] The width W23 in the X direction of the other side spacer bar 24j is larger than the width W18 in the X direction of the other side spacer bar 24d of the first embodiment.

[0134] Refrigerant condensation channel 503 of the third modified example is a channel in which refrigerant 3 condenses. Refrigerant condensation channel 503 is a channel in which the internal space of condenser section 501 is partitioned by partition plate 504 and frame-shaped member 25 a.

[0135] FIG. 15 is a diagram showing a cross section along the X direction of a boiling type cooling device 500 according to a third modified example of the present invention.

[0136] The condenser section 501 has an outlet-side refrigerant flow path 505 .

[0137] The outlet-side refrigerant flow path 505 is a flow path through which the refrigerant 3 can flow. The outlet-side refrigerant flow path 505 is a flow path in which the space inside the condensation section 501 is partitioned by the partition plate 504, the top plate 24b, and the frame-shaped member 25a. The outlet-side refrigerant flow path 505 is connected to the other end of the refrigerant condensation flow path 503 in the X direction and to the boiling section 1.

[0138] The second flow path width W24 in the X direction of the outlet side refrigerant flow path 505 is equal to the first flow path width W1 and is larger than the second flow path width W2 of the first embodiment.

[0139] FIG. 16 is a cross-sectional view taken along line XVI-XVI of a boiling type cooling device 500 according to a third modified example of the present invention.

[0140] One side opening 31 and the other side opening 37 are formed in one direction and the other direction of the X direction of refrigerant condensation channel 503 .

[0141] The width W25 of the other-side opening 37 in the Z direction is equal to the width W6. The length L17 of the other-side opening 37 in the Y direction is equal to the length L1 of the one-side opening 31 in the Y direction.

[0142] FIG. 17 is a cross-sectional view taken along line XVII-XVII of a boiling type cooling device 500 according to a third modified example of the present invention.

[0143] A one-side opening 33 and an other-side opening 38 are formed on one side and the other side of the external gas flow path 502 in the X direction.

[0144] The other-side opening 38 is an opening provided in the other-side spacer bar 24j. The other-side opening 38 penetrates the other-side spacer bar 24j in the Z direction.

[0145] The width W26 of the other-side opening 38 in the X direction is equal to the second flow path width W24 of the outlet-side refrigerant flow path 505. In addition, the length L18 of the other-side opening 38 in the Y direction is equal to the length of the outlet-side refrigerant flow path 505 in the Y direction.

[0146] The other spacer bar 24j is provided with a second partition member 506 that separates the outlet-side refrigerant flow path 505 into a plurality of sections.

[0147] The second partition member 506 is a member that divides the other-side opening 38 into multiple opening portions 38a lined up in the Y direction. The second partition member 506 is joined to the other-side spacer bar 24j by brazing, welding, or the like. The second partition member 506 may be formed integrally with the other-side spacer bar 24j. In other words, the second partition member 506 may be formed as a beam portion that remains without through holes formed when the multiple opening portions 38a are formed in the other-side spacer bar 24j.

[0148] The width W27 in the X direction of each of the plurality of openings 38a is equal to the width W26. The width W27 is also equal to the width W10.

[0149] Furthermore, the length L19 in the Y direction of each of the plurality of opening portions 38a is shorter than the length L18. The length L19 is also shorter than the length L5. Therefore, the cross-sectional area of ​​the inlet-side refrigerant flow path 22 is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path 505.

[0150] Furthermore, since the length L19 is smaller than the length L5, the interval P1 between the plurality of openings 38a is greater than the interval P2 between the plurality of openings 33a.

[0151] FIG. 18 is a cross-sectional view taken along line XVIII-XVIII of a boiling type cooling device 500 according to a third modified example of the present invention.

[0152] A one-side opening 35 and an other-side opening 39 are formed on one and the other sides of the partition plate 504 in the X direction.

[0153] The other-side opening 39 penetrates the partition plate 504 in the Z direction. The other-side opening 39 is disposed at a position corresponding to the other-side openings 37 and 38.

[0154] The width W28 of the other-side opening 39 in the X direction is equal to the second flow path width W24 of the outlet-side refrigerant flow path 505. In addition, the length L20 of the other-side opening 39 in the Y direction is equal to the length of the outlet-side refrigerant flow path 505 in the Y direction.

[0155] Similarly to the other-side opening 38, the other-side opening 39 is partitioned into a plurality of opening portions 39a by a second partition member 506.

[0156] The width W29 in the X direction of each of the plurality of openings 39a is equal to the width W28. The length L21 in the Y direction of each of the plurality of openings 39a is smaller than the length L20 in the Y direction of the other-side opening 39. The length L21 is also smaller than the length L9 in the Y direction of each of the plurality of openings 35a.

[0157] Furthermore, since the length L21 is smaller than the length L9, the interval P3 between the plurality of openings 39a is greater than the interval P4 between the plurality of openings 35a.

[0158] (Effects of the third modified example) According to the boiling type cooling device 500 of the third modified example, the cross-sectional area of ​​the inlet side refrigerant flow path 22 is larger than the cross-sectional area of ​​the outlet side refrigerant flow path 505, so that, similar to the boiling type cooling device 100 of the first embodiment described above, it is possible to suppress a decrease in cooling performance.

[0159] (Fourth Modification) A fourth modification will be described with reference to Fig. 19 and Fig. 20. Fig. 19 is a view of a boiling section 1 and a condensing section 601 according to the fourth modification of the present invention, viewed in the Y direction.

[0160] The condenser 601 is a box-shaped member made of a flat metal member. The condenser 601 is made of, for example, aluminum or an aluminum alloy. The condenser 601 differs from the condenser 2 of the first embodiment in that the width of the external gas flow path 20 in the X direction varies depending on the position in the Z direction. The condenser 601 has external gas flow paths 20, 602a, 602b, and 602c, whose widths in the X direction vary toward one side in the Z direction.

[0161] Each of the external gas flow paths 602a, 602b, and 602c is a flow path through which external gas can pass.

[0162] The external gas flow path 602a has the largest width W30 in the X direction. The widths in the X direction decrease in order of the width W31 in the X direction of the external gas flow path 602b, the width W32 in the X direction of the external gas flow path 602c, and the width W3 in the X direction of the external gas flow path 20.

[0163] The external gas flow path 602a is a flow path in which the space inside the condenser section 601 is partitioned by a partition plate 603a, a top plate 24b, one side spacer bar 24k, and the other side spacer bar 24l.

[0164] The external gas flow path 602b is a flow path in which the space inside the condenser section 601 is partitioned by two partition plates 603b, one side spacer bar 24m, and the other side spacer bar 24n.

[0165] The external gas flow path 602c is a flow path in which the space inside the condenser section 601 is partitioned by two partition plates 603c, one side spacer bar 24o, and the other side spacer bar 24p.

[0166] The partition plates 603a to 603c have the same configuration as the partition plate 24a, except that the widths of the openings on one side and the openings on the other side in the X direction are different.

[0167] The widths in the X direction of each spacer bar on one side are W17, which is the largest, followed by W35, W34, and W33 of the spacer bar 24m, 24k, respectively.

[0168] Furthermore, among the widths of each of the other-side spacer bars in the X direction, the width W18 of the other-side spacer bar 24d is the largest, followed by the width W38 of the other-side spacer bar 24p in the X direction, the width W37 of the other-side spacer bar 24n in the X direction, and the width W36 of the other-side spacer bar 24l in the X direction.

[0169] FIG. 20 is a diagram showing a cross section along the X direction of a boiling type cooling device 600 according to a fourth modified example of the present invention.

[0170] The width of the opening in the X direction of the one-side spacer bars (24c, 24k, 24m, and 24o) decreases toward one side in the Z direction. The width of the opening in the X direction of the other-side spacer bars (24d, 24l, 24n, and 24p) decreases toward one side in the Z direction.

[0171] When three refrigerant condensation channels 21 having the same cross-sectional area are provided, each of the one-side openings is formed so that the size of the one-side opening provided at a position closest to the boiling portion 1 is used as a reference and the size of the remaining one-side openings is reduced by one-third.

[0172] 20, each of the openings on the other side is formed to be reduced in size by one-third of the opening, similar to the openings on the one side. Note that the openings on the other side may be equal in size.

[0173] Furthermore, although FIG. 20 shows an example in which an opening is provided in one spacer bar 24k, the one spacer bar 24k does not necessarily have to have an opening.

[0174] Further, the other spacer bar 24l does not necessarily have to have an opening.

[0175] (Fifth Modification) A fifth modification will be described with reference to Figures 21 and 22. Figure 21 is a perspective view showing an example of a boiling type cooling device 700 according to the fifth modification of the present invention.

[0176] The boiling type cooling device 700 includes a boiling section 701 and a condensing section 702 .

[0177] The condenser 702 is a box-shaped member made of a flat metal member, such as aluminum or an aluminum alloy, and has a plurality of external gas flow paths 703 and a plurality of refrigerant condensation flow paths 704.

[0178] The external gas flow path 703 is a flow path through which external gas can flow. The detailed configuration of the external gas flow path 703 will be described later.

[0179] The refrigerant condensation channel 704 is a channel in which the refrigerant 3 condenses. The detailed configuration of the refrigerant condensation channel 704 will be described later.

[0180] 21, the up-down direction is designated as direction A. The direction in which the external gas flow paths 703 extend is designated as direction B. The direction in which the multiple external gas flow paths 703 are lined up is designated as direction C.

[0181] The boiling portion 701 is a flat metal member made of, for example, aluminum or an aluminum alloy, and is provided on one surface of the condensing portion 702 in the C direction.

[0182] FIG. 22 is a diagram showing a cross section along the C direction of a boiling type cooling device 700 according to a fifth modified example of the present invention.

[0183] In the boiling portion 701, a portion for containing the refrigerant 3 is formed by a peripheral wall member 710.

[0184] The peripheral wall member 710 is a member that forms one and the other surfaces of the boiling portion 701 in the direction A, one and the other surfaces in the direction B, and one and the other surfaces in the direction C. The peripheral wall member 710 is a plate-shaped aluminum member.

[0185] The surface 710a is a surface disposed on one side of the direction C of the boiling portion 701. The heating element HS is provided on the surface 710a.

[0186] A first opening 710b is formed on one side of the boiling portion 701 in the direction A. The boiling portion 701 communicates with the condensing portion 702 via the first opening 710b.

[0187] A second opening 710c is provided on the other side of the boiling portion 701 in the direction A. The boiling portion 701 communicates with the condensing portion 702 via the second opening 710c.

[0188] The boiling portion 701 contains the refrigerant 3. The liquid surface 3a is located on the other side of the condensing portion 702 in the A direction.

[0189] The condenser section 702 has a plurality of external gas flow paths 703 , a plurality of refrigerant condensation flow paths 704 , an inlet-side refrigerant flow path 705 , and an outlet-side refrigerant flow path 706 .

[0190] Of the multiple external gas flow paths 703, the external gas flow path 703 (external gas flow path 703a) located furthest in the other direction in the C direction is a flow path in which the internal space of the condensation section 702 is partitioned by a partition plate 707a, a side plate 707b, an upper spacer bar 707c, and a lower spacer bar 707d.

[0191] Furthermore, among the multiple external gas flow paths 703, the external gas flow paths 703 other than the one furthest in the other direction in the C direction are flow paths in which the internal space of the condensation section 702 is partitioned by two partition plates 707a, an upper spacer bar 707c, and a lower spacer bar 707d.

[0192] The condenser section 702 differs from the condenser section 2 of the first embodiment in that a plurality of external gas flow paths 703 and a plurality of refrigerant condensation flow paths 704 are arranged in the horizontal direction.

[0193] That is, the partition plate 707a, the side plate 707b, the upper spacer bar 707c, and the lower spacer bar 707d are arranged in different directions, but have the same configuration as the partition plate 24a, the top plate 24b, the one-side spacer bar 24c, and the other-side spacer bar 24d of the first embodiment described above.

[0194] The refrigerant condensation flow path 704 is a flow path in which the space inside the condenser section 702 is partitioned by two partition plates 707a and a frame-shaped member 708. The frame-shaped member 708 has the same configuration as the frame-shaped member 25a of the first embodiment, although the orientation of the frame-shaped member 708 is different.

[0195] The inlet-side refrigerant flow path 705 is a flow path through which the refrigerant 3 can flow. The inlet-side refrigerant flow path 705 is a flow path in which the space inside the condenser section 702 is partitioned by a partition plate 24a, a side plate 707b, an upper spacer bar 707c, and a frame-shaped member 708. The inlet-side refrigerant flow path 705 communicates with the boiling section 701 via a first opening 710b.

[0196] The outlet-side refrigerant flow path 706 is a flow path through which the refrigerant 3 can flow. The outlet-side refrigerant flow path 706 is a flow path in which the space inside the condensation section 702 is partitioned by a partition plate 707 a, a side plate 707 b, a lower spacer bar 707 d, and a frame-shaped member 708. The outlet-side refrigerant flow path 706 communicates with the boiling section 701 via a second opening 710 c.

[0197] The cross-sectional area of ​​the inlet-side refrigerant flow path 705 is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path 706. Specifically, the lengths of the inlet-side refrigerant flow path 705 and the outlet-side refrigerant flow path 706 in direction B are equal to each other. The height H6 of the inlet-side refrigerant flow path 705 in direction A is larger than the height H7 of the outlet-side refrigerant flow path 706 in direction A.

[0198] Therefore, the vaporized refrigerant 3 flows through the inlet-side refrigerant flow path 705 , the refrigerant condensation flow path 704 , and the outlet-side refrigerant flow path 706 in this order, and returns to the boiling section 701 .

[0199] (Effects of the fifth modified example) According to the boiling type cooling device 700 of the fifth modified example, the cross-sectional area of ​​the inlet side refrigerant flow path 705 is larger than the cross-sectional area of ​​the outlet side refrigerant flow path 706, so that, similar to the boiling type cooling device 100 of the first embodiment described above, it is possible to suppress a decrease in cooling performance.

[0200] (Sixth Modification) The number of external gas flow paths (20, 202, 302, 402, 502, and 703) and the number of refrigerant condensation flow paths (21, 503, and 704) may be other than those shown in the first and second embodiments and the first to fifth modifications.

[0201] (Seventh Modification) The liquid level 3a may be located inside the condensation section (2, 201, 301, 401, 501, 601, and 702).

[0202] (Eighth Modification) The condenser (2, 201, 301, 401, 501, 601, and 702) may have an internal space partitioned such that one cross-sectional area in the X direction of the refrigerant condensation channel (21, 503, 706) is larger than the other cross-sectional area.

[0203] (Ninth Variation) The internal space of the condensation section (2, 201, 301, 401, 501, 601, and 702) may be partitioned such that the width in the X direction tapers toward one side in the Z direction, while the first flow path width W1 and the second flow path width W2 taper toward the other side in the Z direction.

[0204] 1, 701 Boiling section 2, 201, 301, 401, 501, 601, 702 Condensation section 2a Bottom surface 3 Refrigerant 20, 202, 302, 402, 502, 703, 703a External gas flow path 21, 503, 704 Refrigerant condensation flow path 22, 705 Inlet side refrigerant flow path 23, 505, 706 Outlet side refrigerant flow path 24 External gas flow path partition member 25 Refrigerant condensation flow path partition member 26 Inlet side refrigerant flow path partition member 27 Outlet side refrigerant flow path partition member 28 First partition member 29, 506 Second partition member 100, 200, 300, 400, 500, 600, 700 Boiling type cooling device W1 First flow path width W2, W19, W20 Second flow path width

Claims

1. A boiling type cooling device comprising: a boiling section that vaporizes an internal refrigerant by heat absorbed from the outside; and a condensing section that condenses the vaporized refrigerant and returns the condensed refrigerant to the boiling section, wherein the condensing section has: an external gas flow path that is a flow path through which external gas can flow; a refrigerant condensation flow path in which the refrigerant condenses; an inlet-side refrigerant flow path that is connected to the boiling section and one side of the refrigerant condensation flow path in a first direction that is along the refrigerant condensation flow path and is a flow path through which the refrigerant can flow; and an outlet-side refrigerant flow path that is connected to the other side of the refrigerant condensation flow path in the first direction and to the boiling section and is a flow path through which the refrigerant can flow, wherein the cross-sectional area of ​​the inlet-side refrigerant flow path is larger than the cross-sectional area of ​​the outlet-side refrigerant flow path.

2. The boiling type cooling device according to claim 1, wherein a first flow path width, which is the width in the first direction of the inlet side refrigerant flow path, is larger than a second flow path width, which is the width in the first direction of the outlet side refrigerant flow path.

3. The boiling type cooling device according to claim 2, wherein the width of the first flow path is at least twice the width of the second flow path.

4. The boiling type cooling device according to claim 1, wherein the condensing section includes a refrigerant condensation flow path partitioning member which is a member that partitions the internal space of the condensing section into the refrigerant condensation flow paths, an external gas flow path partitioning member which is a member that partitions the internal space of the condensing section into the external gas flow paths, an inlet side refrigerant flow path partitioning member which is a member that partitions the internal space of the condensing section into the inlet side refrigerant flow paths, and an outlet side refrigerant flow path partitioning member which is a member that partitions the internal space of the condensing section into the outlet side refrigerant flow paths, wherein the refrigerant condensation flow path partitioning member and the external gas flow path partitioning member are arranged adjacent to each other in a height direction which is a direction perpendicular to a bottom surface of the condensing section, wherein the inlet side refrigerant flow path partitioning member is provided with a first partitioning member which is a member that partitions the inlet side refrigerant flow path into a plurality of sections, and wherein the outlet side refrigerant flow path partitioning member is provided with a second partitioning member which is a member that partitions the outlet side refrigerant flow path into a plurality of sections.

5. The boiling type cooling device according to claim 2, wherein the condensing section has a plurality of the refrigerant condensation flow paths and a plurality of the external gas flow paths, and includes a refrigerant condensation flow path partitioning member which is a member that partitions the space inside the condensing section into the refrigerant condensation flow paths, and an external gas flow path partitioning member which is a member that partitions the space inside the condensing section into the external gas flow paths, and the plurality of refrigerant condensation flow path partitioning members and the plurality of external gas flow path partitioning members are arranged alternately adjacent to each other in a height direction which is a direction perpendicular to the bottom surface of the condensing section, and the first flow path width of the inlet side refrigerant flow path at least at a position closest to the boiling section is larger than the second flow path width of the outlet side refrigerant flow path at least at a position closest to the boiling section.

6. The boiling type cooling device according to claim 5, wherein the first flow path widths of the inlet-side refrigerant flow paths are equal to each other at each position in the height direction, and the second flow path widths of the outlet-side refrigerant flow paths are equal to each other at each position in the height direction.

7. A boiling type cooling device as described in claim 5, wherein the width in the first direction of the external gas flow path on the uppermost side, which is the highest in the height direction, among the plurality of external gas flow paths is larger than the width in the first direction of the external gas flow paths other than the uppermost side.

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