Radiator

Abstract

The utility model provides a radiator which is space-saving, excellent in circulation characteristic and cooling performance of gas-phase working fluid and capable of preventing leakage of the gas-phase working fluid. The heat sink includes: a heat transport member having an evaporation portion thermally connected to the heating element; a pipe body connected by a connection portion located at the condensation portion of the heat transport member and having a heat transport direction different from a heat transport direction of the heat transport member; and a heat-radiating fin group which is thermally connected to the tube body and in which a plurality of heat-radiating fins are arranged, the heat-transporting member having an integrated internal space in which a working fluid is sealed and which communicates from the evaporation part to a connection part connected to the tube body, the internal space of the heat-transporting member communicating with the internal space of the tube body via the connection part, and the heat-radiating fin group being provided with a plurality of heat-radiating fins. The tube body is provided with a circular part with a circular radial shape and a flat part with a flat radial shape, the circular part is positioned at the connecting part, and the flat part is positioned at a part thermally connected with the radiating fin group.

Description

Technical Field

[0001] The utility model relates to a radiator for cooling heating elements such as electrical and electronic components mounted on substrates such as electronic circuit substrates, and in particular to a radiator having excellent flow characteristics of a gas phase working fluid and capable of preventing leakage of the gas phase working fluid. Background Art

[0002] As electronic devices become more advanced in performance, multiple components including heat generating bodies such as electronic components are mounted on substrates such as electronic circuit boards inside the electronic devices. In addition, as electronic devices become more advanced in performance, the amount of heat generated by heat generating bodies such as electronic components is increasing. As a means of cooling heat generating bodies such as electronic components, heat transport components such as steam chambers, heat pipes, and radiators are sometimes used.

[0003] On the other hand, in recent years, since a large number of components are mounted in electronic devices at an increasingly high density, the installation space of the radiator is sometimes limited to a small space. In addition, since the heat generated by electronic components increases, the radiator is required to save space and further improve cooling performance.

[0004] Therefore, as a heat transfer member for cooling a heat generating body such as an electronic component, a vapor chamber is proposed, which contains a capillary structure and a working fluid, and the vapor chamber comprises: a first section; a second section extending from one end of the first section in a direction away from the first section; a fourth section extending from the second section in left and right directions; a third section extending from one end of the first section in a direction away from the first section; and a fifth section extending from the third section in left and right directions, and the capillary structure extends throughout the first section to the fifth section (Patent Document 1).

[0005] In Patent Document 1, space saving is achieved and the heating element is cooled by transferring heat from a heating element thermally connected to a first section to a fourth section and a fifth section which are condensation sections extending in left-right directions via a second section and a third section extending from one end of the first section which are evaporation sections.

[0006] However, in Patent Document 1, the first to fifth sections are flat as a whole for space saving, especially for space saving in the thickness direction. Therefore, there is a problem that the flow characteristics of the gas phase working fluid are reduced, especially at the connection parts of the sections.

[0007] In addition, when the number of the fourth and fifth sections as the condensation section is increased in a limited space in order to further improve the cooling capacity of the heat transport member, the intervals between the sections constituting the condensation section are narrowed, and the sections constituting the condensation section may contact each other and generate cracks. When cracks are generated in the sections constituting the condensation section, there is a problem of leakage (leak) of the working fluid in the gas phase from the cracks.

[0008] Patent Document 1: U.S. Patent Application Publication No. 2020 / 0018555 Utility Model Content

[0009] In view of the above circumstances, an object of the present invention is to provide a heat sink which saves space, has excellent flow characteristics of a gas-phase working fluid and cooling performance, and can prevent leakage of the gas-phase working fluid.

[0010] The gist of the structure of the radiator of the present invention is as follows.

[0011] [1] A radiator, comprising: a heat transport member having an evaporation portion thermally connected to a heat generating body; a tube body connected by a connection portion located at a condensation portion of the heat transport member and having a heat transport direction different from the heat transport direction of the heat transport member; and a heat dissipation fin group thermally connected to the tube body and provided with a plurality of heat dissipation fins, the heat transport member having an integral internal space connected from the evaporation portion to the connection portion connected to the tube body and enclosed with a working fluid, the internal space of the heat transport member being connected to the internal space of the tube body via the connection portion, the tube body having a circular portion having a radial shape and a flat portion having a radial shape, the circular portion being located at the connection portion, and the flat portion being located at a location thermally connected to the heat dissipation fin group.

[0012] [2] The heat sink according to [1], wherein:

[0013] A first capillary structure extending from the evaporation portion toward the condensation portion is disposed in the inner space of the heat transport member, and a second capillary structure is disposed in the inner space of the tube.

[0014] [3] The heat sink according to [2], wherein:

[0015] The first capillary structure is connected to the second capillary structure via a connecting member located at the connecting portion.

[0016] [4] The heat sink according to [3], wherein:

[0017] The connecting member is a capillary member having a capillary force.

[0018] [5] The heat sink according to any one of [1] to [4], wherein:

[0019] The tube body has an inclined portion between the circular portion and the flat portion, the inclined portion being inclined from the flat portion toward the circular portion.

[0020] [6] The heat sink according to any one of [1] to [4], wherein:

[0021] The heat transport member is of a planar type extending on the same plane.

[0022] [7] The heat sink according to any one of [1] to [4], wherein:

[0023] The heat transport member includes a heat dissipation side stepped portion between a heat insulating portion located between the evaporation portion and the condensation portion and the condensation portion, wherein the heat dissipation side stepped portion is stepped in a direction not parallel to a heat transport direction of the heat transport member.

[0024] [8] The heat sink according to any one of [1] to [4], wherein:

[0025] The heat transport member includes a heat receiving side stepped portion between the evaporation portion and the heat insulating portion, and the heat receiving side stepped portion is provided with a step in a direction not parallel to a heat transport direction of the heat transport member.

[0026] [9] The heat sink according to any one of [1] to [4], wherein:

[0027] The tube body extends along the configuration direction of the plurality of heat dissipation fins.

[0028]

[10] The heat sink according to any one of [1] to [4], wherein:

[0029] The tubes are provided in plurality and extend from the heat transport member in a plurality of directions.

[0030] In the above-mentioned method, the portion of the heat transport member that is thermally connected to the heat generating body as the cooling object functions as an evaporation portion (heat receiving portion), and the portion connected to the tube body functions as a condensation portion (heat dissipation portion) of the heat transport member. In the evaporation portion of the heat transport member, the working fluid receives heat from the heat generating body and changes phase from the liquid phase to the gas phase, and in the condensation portion of the heat transport member, a part of the gas phase working fluid releases latent heat and changes phase from the gas phase to the liquid phase. In the method of the radiator of the utility model, the heat of the heat generating body is transported from the evaporation portion of the heat transport member to the condensation portion of the heat transport member through the heat transport member, and then transported from the condensation portion of the heat transport member to the tube body. In addition, the working fluid that receives heat from the heat generating body and changes phase to the gas phase through the heat transport member flows from the heat transport member to the tube body via the connection portion. By allowing the gas phase working fluid to flow from the heat transport member to the tube body, the tube body receives heat from the heat transport member, and then transfers the heat received from the heat transport member to the heat dissipation fin group that is thermally connected to the tube body. When the tube transfers the heat received from the heat transport member to the fin group, the gas phase working fluid flowing from the heat transport member to the tube changes phase to the liquid phase. The heat transferred from the tube to the fin group is released from the fin group to the external environment of the radiator.

[0031] In the above embodiment, since the heat transport direction of the heat transport member is different from the heat transport direction of the tube, the extending direction of the heat transport member is different from the extending direction of the tube.

[0032] Effect of utility model

[0033] According to the heat sink of the utility model, the tube body has a circular portion whose radial shape is a circular shape and a flat portion whose radial shape is a flat shape. Since the circular portion is located at the connection portion connected to the heat transport member, the pressure loss of the gas phase working fluid in the connection portion is reduced, and thus the flow characteristics of the gas phase working fluid are excellent. In addition, since the radial shape of the tube body in the connection portion is circular, even if the number of tube bodies is increased to improve the cooling characteristics, the interval between the tube bodies can be sufficiently ensured at the base of the tube body located at the connection portion, so that excellent cooling performance can be obtained, and cracks (cracks) can be prevented from being generated in the heat transport member at the position between the tube body and the heat transport member due to contact between the tube body and the heat transport member. Since cracks (cracks) can be prevented from being generated in the heat transport member, the bonding material such as flux that bonds the tube body to the heat transport member can be prevented from intruding from the cracks (cracks) into the internal space of the tube body and the heat transport member, and as a result, the capillary force can be prevented from being reduced due to the bonding material such as solder being absorbed by the member having capillary force disposed in the internal space of the tube body and the heat transport member. In addition, since cracks can be prevented from being generated in the heat transport member, leakage of the gas phase working fluid can be prevented. In addition, according to the heat sink of the present invention, the flat portion is located at a location that is thermally connected to the heat dissipation fin group, thereby making the heat sink space-saving.

[0034] In one aspect of the radiator of the present invention, the internal space of the heat transport component having the evaporation portion is different from the internal space of the heat pipe group having a plurality of heat pipes arranged in parallel, and is connected as a whole. As described above, in the aspect of the radiator of the present invention in which the heat transport component having an integrated internal space transports the heat of the heating element from the evaporation portion to the connection portion of the pipe body thermally connected to the heat dissipation fins, the flow characteristics of the working fluid are excellent, and even if the heat generated from the heating element increases, the heat input to the evaporation portion can be made uniform, thereby reducing the thermal resistance of the evaporation portion. In addition, in the aspect of the radiator of the present invention, since the internal space of the heat transport component is connected as a whole, even if uneven heat generation occurs on the heating element, the heating element as a whole can be cooled uniformly.

[0035] In one aspect of the radiator of the present invention, the tube body has a heat transport direction different from the heat transport direction of the heat transport member, thereby preventing the size of the radiator from increasing in the extension direction of the heat transport member (heat transport direction), resulting in space saving.

[0036] According to one embodiment of the radiator of the present invention, a first capillary structure extending from the evaporation portion toward the condensation portion is provided in the internal space of the heat transport component, and a second capillary structure is provided inside the tube body, thereby allowing the working fluid that changes from gas phase to liquid phase in the internal space of the tube body to smoothly flow back to the evaporation portion of the heat transport component.

[0037] According to the heat sink of the present invention, the first capillary structure is connected to the second capillary structure via the connection member located at the connection portion, thereby allowing the liquid working fluid to smoothly reflux from the second capillary structure to the first capillary structure.

[0038] According to the radiator method of the utility model, the tube body has an inclined portion between the circular portion and the flat portion, which is inclined from the flat portion toward the circular portion. As a result, the reflux of the liquid working fluid from the tube body to the heat transfer component becomes smoother, and the reflux characteristics of the liquid working fluid from the tube body to the heat transfer component are further improved.

[0039] According to the aspect of the heat sink of the present invention, the heat transport member is a flat type extending on the same plane, thereby saving space for the heat transport member, particularly saving space in the thickness direction of the heat transport member.

[0040] According to the radiator mode of the present invention, the heat transport component has a heat dissipation side step portion between the insulation portion and the condensation portion, and the heat dissipation side step portion is provided with a step in a direction which is not parallel to the heat transport direction of the heat transport component. Thus, in an environment where the installation space of the radiator is limited, the radiator can be installed even if there is a prohibited area in the installation space near the condensation portion.

[0041] According to the radiator mode of the present invention, the heat transport member has a heat receiving side step portion between the evaporation portion and the insulation portion, and the heat receiving side step portion is provided with a step in a direction which is not parallel to the heat transport direction of the heat transport member. Thus, in an environment where the installation space of the radiator is limited, the radiator can be installed even if there is a prohibited area in the installation space near the evaporation portion.

[0042] According to the heat sink of the present invention, the tube body is provided in plurality and extends from the heat transport member in a plurality of directions, whereby the heat transported from the heat transport member to the tube body is transported in a plurality of directions different from the extending direction (heat transport direction) of the heat transport member. Therefore, in the extending direction (heat transport direction) of the heat transport member, the size of the heat sink can be more reliably prevented from increasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1It is a perspective view explaining the outline of the heat sink according to the first embodiment of the present invention.

[0044] Figure 2 It is a side view explaining the outline of the heat sink which concerns on 1st Embodiment of this invention.

[0045] Figure 3 This is a perspective view for explaining an outline of the inside of the heat sink according to the first embodiment of the present invention.

[0046] Figure 4 It is an explanatory diagram schematically showing a connection portion between a heat transport member and a pipe body of a heat sink according to the first embodiment of the present invention.

[0047] Figure 5 This is a side view schematically illustrating the interior of the heat sink according to the first embodiment of the present invention.

[0048] Figure 6 It is a perspective view explaining the outline of the heat sink which concerns on 2nd Embodiment of this invention.

[0049] Figure 7 It is a side view explaining the outline of the heat sink which concerns on 2nd Embodiment of this invention.

[0050] Figure 8 It is a perspective view explaining the outline of the inside of the heat sink according to the second embodiment of the present invention.

[0051] Fig. 9 It is an explanatory diagram schematically showing a connection portion between a heat transport member and a pipe body of a radiator according to a second embodiment of the present invention.

[0052] Fig.10 It is a side view explaining the outline of the inside of the heat sink which concerns on the 2nd Embodiment of this invention.

[0053] Description of reference numerals:

[0054] 1.2 Radiator

[0055] 10Heat transport component

[0056] 14First capillary structure

[0057] 20 cooling fins

[0058] 30Connection

[0059] 31 tube body

[0060] 34 Second capillary structure

[0061] 36 round part

[0062] 37 Flat part

[0063] 39 inclined part

[0064] 41 Evaporation section

[0065] 42 Condensation unit DETAILED DESCRIPTION

[0066] Hereinafter, the heat sink according to the embodiment of the present invention will be described using the drawings. First, the heat sink according to the first embodiment of the present invention will be described. Figure 1 It is a perspective view explaining the outline of the heat sink according to the first embodiment of the present invention. Figure 2 It is a side view explaining the outline of the heat sink which concerns on 1st Embodiment of this invention. Figure 3 This is a perspective view for explaining an outline of the inside of the heat sink according to the first embodiment of the present invention. Figure 4 It is an explanatory diagram schematically showing a connection portion between a heat transport member and a pipe body of a heat sink according to the first embodiment of the present invention. Figure 5 This is a side view schematically illustrating the interior of the heat sink according to the first embodiment of the present invention.

[0067] like Figure 1 , 2 As shown, the radiator 1 according to the first embodiment of the present invention comprises: a heat transport member 10 having an evaporation portion 41 (heat receiving portion 41) thermally connected to a heat generating body 100; a tube body 31 connected by a connection portion 30 of a condensation portion 42 (heat dissipation portion 42) located in the heat transport member 10 and having a heat transport direction different from the heat transport direction of the heat transport member 10; and a heat dissipation fin group 20 thermally connected to the tube body 31 and provided with a plurality of heat dissipation fins. The heat dissipation fin group 20 comprises a plurality of first heat dissipation fins 21, 21, 21, ... mounted on the tube body 31, and a plurality of second heat dissipation fins 22, 22, 22, ... mounted on the heat transport member 10. The tube body 31 and the heat transport member 10 are connected by the condensation portion 42 of the heat transport member 10.

[0068] The heat transport member 10 has an integrated internal space that is connected from the evaporation portion 41 to the connection portion 30 connected to the tube body 31 and filled with a working fluid. The internal space of the heat transport member 10 is different from the internal space of a heat pipe group in which a plurality of heat pipes are arranged in parallel, and is entirely connected and integrated.

[0069] The internal space of the heat transport member 10 communicates with the internal space of the tube 31 via the connection portion 30. That is, in the heat sink 1, the internal space of the heat transport member 10 communicates with the internal space of the tube 31 to form an integral whole, and a working fluid is sealed in the integral internal space.

[0070] like Figure 1 , 2 As shown, the heat transport member 10 includes: a container 19 having a hollow cavity 13; and a working fluid (not shown) flowing in the cavity 13. In addition, a first capillary structure 14 having a capillary force extending from the evaporation portion 41 to the condensation portion 42 is provided in the cavity 13. The container 19 is formed by overlapping a plate-like body 11 on one side of the installation surface side of the radiator 1 and a plate-like body 12 on the other side opposite to the plate-like body 11 on one side.

[0071] The plate-like body 11 on one side is a plate-like body having a side wall erected from the plane portion at the edge of the plane portion. The plate-like body 12 on the other side is also a plate-like body having a side wall erected from the plane portion at the edge of the plane portion. Therefore, the plate-like body 11 on one side and the plate-like body 12 on the other side are concave. By overlapping the plate-like body 11 on one side and the plate-like body 12 on the other side in a state where the concave shapes are opposite to each other, a hollow portion 13 of the container 19 is formed. The container 19 extends on the same plane. As described above, the heat transport member 10 is a planar type extending on the same plane. The hollow portion 13 of the container 19 is an internal space that is sealed relative to the external environment and is depressurized by a degassing process.

[0072] The portion of the outer surface of the container 19 that is thermally connected to the heat generating element 100 to be cooled functions as the evaporation portion 41. The heat generating element 100 is thermally connected to the container 19, so that the heat generating element 100 is cooled. In the heat transport member 10, since one end is thermally connected to the heat generating element 100, an evaporation portion 41 is formed at one end. In addition, a heat receiving portion inner surface area enlargement portion 44 is provided in the evaporation portion 41 in the inner surface of the container 19. The heat receiving portion inner surface area enlargement portion 44 is a portion where concave and convex are repeatedly formed, and in the radiator 1, a plurality of plate-like fins 45, 45, etc. are vertically arranged on the inner surface of the plate-like body 11 on one side. By providing the heat receiving portion inner surface area enlargement portion 44 in the evaporation portion 41, the heat transfer from the evaporation portion 41 to the liquid phase working fluid becomes smooth. In addition, depending on the use conditions of the radiator 1, the heat receiving portion inner surface area enlargement portion 44 may not be provided.

[0073] The heat transport member 10 extends from the position of the heating element 100 in a predetermined direction, and is thermally connected to a plurality of second heat dissipation fins 22, 22, 22, ... forming the heat dissipation fin group 20 at the other end opposite to the one end. The other end of the heat transport member 10 thermally connected to the heat dissipation fin group 20 functions as a condensation portion 42 of the heat transport member 10.

[0074] In the heat transport member 10, the middle portion between the evaporation portion 41 located at one end of the container 19 and the condensation portion 42 located at the other end of the container 19 functions as a heat insulating portion 43. The heat insulating portion 43 is a portion that is not thermally connected to the heat dissipation fin group 20 or the heating element 100. Therefore, the heat insulating portion 43 is a portion that does not actively receive and dissipate heat. The heat transferred from the heating element 100 to the evaporation portion 41 is transported from the evaporation portion 41 to the condensation portion 42 along the extension direction of the heat insulating portion 43.

[0075] The width dimension of the heat transport member 10 is not particularly limited. In the heat sink 1, for ease of explanation, the evaporation section 41, the insulation section 43, and the condensation section 42 are substantially the same size. In addition, the width dimension of the heat transport member 10 in the evaporation section 41 can be appropriately selected according to the width dimension of the heating element 100, etc.

[0076] like Figure 1 , 3 As shown, the first capillary structure 14 extends from the evaporation portion 41 to the condensation portion 42 of the container 19 at the widthwise center of the heat transport member 10. As the container 19 extends on the same plane, the first capillary structure 14 extends on the same plane.

[0077] The structure of the first capillary structure 14 is not particularly limited, and examples thereof include a sintered body of metal powder such as copper powder, a metal mesh composed of metal wires, grooves (a plurality of fine grooves), nonwoven fabrics, metal fibers, and the like. In the heat transport member 10, a sintered body of metal powder is used as the first capillary structure 14. The portion of the hollow portion 13 where the first capillary structure 14 is not provided functions as a vapor flow path 15 through which a gaseous working fluid flows. Corresponding to the first capillary structure 14 extending from the evaporation portion 41 of the heat transport member 10 (container 19) to the condensation portion 42, the vapor flow path 15 extends from the evaporation portion 41 of the heat transport member 10 (container 19) to the condensation portion 42. The heat transport member 10 utilizes the heat transport characteristics generated by the action of the working fluid to transport the heat of the heat generating element 100 received by the evaporation portion 41 from the evaporation portion 41 to the condensation portion 42.

[0078] like Figures 1 to 3 As shown, a plurality of tubes 31, 31, 31, ... whose inner spaces are connected to the hollow portion 13 of the container 19 are provided at the other end of the heat transport member 10. The inner space of the tube 31 is connected to the hollow portion 13 of the heat transport member 10 via the connection portion 30. Therefore, the working fluid flowing in the hollow portion 13 is sealed in the space from the hollow portion 13 to the inside of the tube 31.

[0079] In the heat sink 1, the tube body 31 has: a circular portion 36 having a circular shape in a direction perpendicular to the longitudinal direction (radial direction); and a flat portion 37 having a flat shape in a direction perpendicular to the longitudinal direction (radial direction). Examples of the shape of the flat portion 37 include an elliptical shape, a rounded rectangle, and the like. In addition, the flat portion 37 is flat in the extension direction of the heat transport member 10 (i.e., flat in the transverse direction). The flat portion 37 can be formed by flattening a portion having a circular shape in the radial direction. The circular portion 36 of the tube body 31 is located at the connection portion 30 connected to the heat transport member 10, and the flat portion 37 of the tube body 31 is located at a portion where a plurality of heat dissipation fins 21, 21, 21, ... are thermally connected.

[0080] In addition, the tube body 31 has a boundary portion 38 between the circular portion 36 and the flat portion 37. The radial shape of the boundary portion 38 is neither a circular shape nor a flat shape, but a shape that changes from a circular shape to a flat shape. As described above, the tube body 31 has a circular portion 36, a boundary portion 38, and a flat portion 37 in order from the connecting portion 30 along the length direction. In addition, the internal spaces of the circular portion 36, the boundary portion 38, and the flat portion 37 are interconnected, and the working fluid can flow.

[0081] In the heat sink 1, the plurality of tubes 31, 31, 31, ... are each structured to have a circular portion 36 having a circular shape in the radial direction and a flat portion 37 having a flat shape in the radial direction. As described above, the interval between the adjacent tubes 31 is such that the connection portion 30 between the heat transport member 10 and the tube 31 is wider than the portion where the plurality of heat dissipation fins 21, 21, 21, ... are thermally connected.

[0082] like Figure 4 As shown, in the tube body 31, between the round part 36 and the flat part 37, there is formed an inclined part 39 which is inclined from the flat part 37 toward the round part 36. The inclined part 39 is inclined in the direction of the installation surface of the heat sink 1. In the heat sink 1, the boundary part 38 is formed into the inclined part 39 which is inclined in a slope shape along the longitudinal direction of the tube body 31.

[0083] In the internal space of the tube body 31, the ratio of the diameter of the circular portion 36 to the thickness of the flat portion 37 is not particularly limited and can be appropriately selected according to the use conditions of the heat sink 1. In the internal space of the tube body 31, the ratio of the thickness of the flat portion 37 to the diameter of the circular portion 36 is preferably, for example, 0.30 or more and 0.90 or less, and particularly preferably 0.50 or more and 0.80 or less. In addition, the shape of the tube body 31 in the longitudinal direction is not particularly limited, and is substantially linear in the heat sink 1. In addition, the shape and size of any tube body 31 are substantially the same.

[0084] In the radiator 1, the tube body 31 extends in a direction substantially orthogonal to the heat transport direction of the heat transport member 10 along the plane direction of the condensation portion 42 of the heat transport member 10. Since the extension direction of the tube body 31 is not parallel to the heat transport direction of the heat transport member 10, the tube body 31 has a heat transport direction different from the heat transport direction of the heat transport member 10. The heat transported from the evaporation portion 41 to the condensation portion 42 by the heat transport member 10 is transported by the tube body 31 in a direction different from the extension direction of the heat transport member 10. Therefore, the size of the radiator 1 in the extension direction (heat transport direction) of the heat transport member 10 can be prevented from increasing, and thus, space saving of the radiator 1 can be achieved.

[0085] In addition, a plurality of tube bodies 31 are provided, and extend from the condensation portion 42 of the heat transport member 10 in a plurality of directions. In the radiator 1, the tube body 31 extends in both left and right directions, that is, in two directions, with the heat transport member 10 as the center. In addition, the tube body 31 is provided with the same number of roots in both left and right directions with the heat transport member 10 as the center. Since a plurality of tube bodies 31, 31, 31... extend from the heat transport member 10 in a plurality of directions (two directions in the radiator 1), the heat transported from the heat transport member 10 to the tube body 31 is branched and transported in a plurality of directions (two directions in the radiator 1) different from the extension direction (heat transport direction) of the heat transport member 10. Therefore, the increase in the size of the radiator 1 in the extension direction (heat transport direction) of the heat transport member 10 can be more reliably prevented.

[0086] like Figures 1 to 4 As shown, the end portion 32 of the tube body 31 on the heat transport member 10 side (hereinafter, sometimes referred to as the "base portion") is located at the connection portion 30 and is open. The open base portion 32 constitutes a circular portion 36. On the other hand, the end portion 33 opposite to the heat transport member 10 (hereinafter, sometimes referred to as the "top end") is closed. The closed top end 33 constitutes a flat portion 37. In addition, the hollow portion 13 of the container 19 is connected to the internal space of the tube body 31, and the internal space of the tube body 31 is depressurized by degassing in the same way as the hollow portion 13. Therefore, the working fluid can flow between the hollow portion 13 of the container 19 and the internal space of the tube body 31.

[0087] In addition, a through hole (not shown) for attaching the tube body 31 to the container 19 is formed on the side surface of the container 19. The shape and size of the through hole correspond to the shape and size of the base 32 of the tube body 31, and the tube body 31 is connected to the container 19 by inserting the base 32 of the tube body 31 into the through hole of the container 19. Therefore, the tube body 31 and the container 19 are composed of different members. There is no particular limitation on the method for fixing the tube body 31 attached to the container 19, and for example, a bonding method using a bonding material such as solder can be cited.

[0088] In the heat sink 1, since the tube body 31 and the heat transport member 10 are formed of different members, the arrangement and size of the tube body 31 can be freely selected, thereby increasing the degree of freedom in designing the heat sink 1. In addition, in the heat sink 1, the tube body 31 can be attached to the container 19 by inserting the tube body 31 into the through hole of the container 19, so that assembly is easy.

[0089] like Figure 3 , 4 As shown, a second capillary structure 34 having a capillary force different from the first capillary structure 14 provided in the container 19 is provided inside the tube body 31. By providing the first capillary structure 14 extending from the evaporation portion 41 to the condensation portion 42 in the heat transport member 10 and providing the second capillary structure 34 inside the tube body 31, the working fluid that changes from the gas phase to the liquid phase in the internal space of the tube body 31 can smoothly flow back to the evaporation portion 41 of the heat transport member 10. The second capillary structure 34 is not particularly limited, and examples thereof include a sintered body of a metal powder such as copper powder, a metal mesh composed of metal wires, a groove, a nonwoven fabric, a metal fiber, and the like. In the tube body 31, as the second capillary structure 34, a plurality of fine grooves are formed in a manner covering the entire inner surface of the tube body 31. The fine grooves extend along the length direction of the tube body 31.

[0090] like Figure 4 As shown, the first capillary structure 14 provided in the heat transport member 10 may be connected to the second capillary structure 34 provided in the tube body 31 via the connecting member 35 located in the connecting portion 30. The working fluid that changes from the gas phase to the liquid phase inside the tube body 31 flows back from the top end 33 of the tube body 31 to the base 32 in the second capillary structure 34 by the capillary force of the second capillary structure 34 inside the tube body 31, and the liquid-phase working fluid that flows back to the base 32 of the tube body 31 flows from the second capillary structure 34 to one end of the connecting member 35. The liquid-phase working fluid that flows from the second capillary structure 34 to one end of the connecting member 35 can flow from one end to the other end of the connecting member 35, and flows back from the other end of the connecting member 35 to the first capillary structure 14 of the heat transport member 10.

[0091] Therefore, by providing the connection member 35 on the connection portion 30, the backflow of the liquid-phase working fluid from the second capillary structure 34 to the first capillary structure 14 can be smoothed. As described above, the flow performance of the liquid-phase working fluid between the tube body 31 and the heat transport member 10 is improved by the connection member 35, so the cooling performance of the heat sink 1 is improved. As the connection member 35, for example, a capillary member having a capillary force can be cited, and specifically, a metal mesh, a braided body of metal wires, metal fibers, etc. can be cited.

[0092] As materials for the container 19 and the tube body 31, for example, copper, copper alloys, aluminum, aluminum alloys, nickel, nickel alloys, stainless steel, titanium, titanium alloys, etc. As working fluids sealed in the hollow portion 13 of the container 19 and the internal space of the tube body 31, they can be appropriately selected according to the compatibility with the materials of the container 19 and the tube body 31, for example, water, fluorocarbons, hydrofluoroether (HFE), cyclopentane, ethylene glycol, and mixtures thereof, etc. can be cited.

[0093] The thickness of the container 19 can be appropriately selected according to mechanical strength, weight, etc., and can be, for example, 0.5 to 3 mm, and the width of the heat transport member 10 can be, for example, 4 to 20 mm. In addition, the diameter of the circular portion 36 of the tube body 31 can be appropriately selected according to mechanical strength, weight, etc., and can be, for example, 5 to 10 mm.

[0094] like Figures 1 to 4 As shown, the heat dissipation fin group 20 is formed by a plurality of first heat dissipation fins 21, 21, 21..., and a plurality of second heat dissipation fins 22, 22, 22... arranged in parallel. The first heat dissipation fins 21 and the second heat dissipation fins 22 are both thin flat plate-shaped components. Among them, the first heat dissipation fins 21 located on both sides of the heat dissipation fin group 20 are arranged in parallel at a predetermined interval in a direction substantially parallel to the length direction of the tube body 31. Therefore, the tube body 31 extends along the arrangement direction of the plurality of first heat dissipation fins 21, 21, 21... In addition, the first heat dissipation fin 21 is installed and fixed to the position of the tube body 31 and is thermally connected to the tube body 31. The first heat dissipation fins 21 are all of substantially the same shape and size. The second heat dissipation fin 22 located in the central part of the heat dissipation fin group 20 is installed and fixed to the position of the heat transport member 10 and is thermally connected to the heat transport member 10. The portion of the heat transport member 10 where the second heat dissipation fin 22 is installed functions as a condensation portion 42. The second heat dissipating fins 22 are installed in a manner of being vertically disposed on the heat transporting member 10 .

[0095] The main surface of the first heat dissipation fin 21 is a surface that mainly exerts the heat dissipation function of the first heat dissipation fin 21. The main surface of the second heat dissipation fin 22 is a surface that mainly exerts the heat dissipation function of the second heat dissipation fin 22. The main surface of the first heat dissipation fin 21 and the main surface of the second heat dissipation fin 22 are arranged to be substantially orthogonal to the extension direction of the tube body 31, that is, the longitudinal direction.

[0096] The method for thermally connecting the first heat dissipating fin 21 and the tube body 31 is not particularly limited, and any known method can be used. For example, a method of forming a through hole (not shown) on the first heat dissipating fin 21 and inserting the tube body 31 into the through hole can be cited. The method for thermally connecting the second heat dissipating fin 22 and the heat transport member 10 is not particularly limited, and any known method can be used. For example, a method of providing a fixing sheet portion extending in a vertical direction relative to the main surface of the heat dissipating fin 22 at the end of the second heat dissipating fin 22, connecting the fixing sheet portion to the plane of the heat transport member 10, and vertically providing the heat dissipating fin 22 on the heat transport member 10 can be cited.

[0097] The heat sink 1 is forcibly air-cooled by, for example, a blower fan (not shown). The cooling air F from the blower fan is supplied from a direction substantially parallel to the heat transport direction of the heat transport member 10. The cooling air F is supplied along the main surface of the first heat dissipation fin 21 and the main surface of the second heat dissipation fin 22, thereby cooling the heat dissipation fin group 20.

[0098] The material of the first heat dissipating fins 21 and the second heat dissipating fins 22 is not particularly limited, and examples thereof include metals such as copper, copper alloys, aluminum, and aluminum alloys, carbon materials such as graphite, and composite members using carbon materials.

[0099] Next, use Figure 1 , 3 5. The mechanism of the cooling function of the heat sink 1 is described. First, the heat generating body 100 as the cooled body is thermally connected to one end of the container 19 of the heat transport member 10, so that the one end functions as the evaporation portion 41. When the one end of the container 19 is heated by the heat generating body 100, the heat is transferred to the liquid phase working fluid in the cavity 13 at the one end of the container 19, and the liquid phase working fluid changes phase to the gas phase working fluid in the cavity 13 at the one end of the container 19. The gas phase working fluid flows from one end of the container 19 to the other end as the condensation portion 42 in the vapor flow path 15. The heat transport member 10 transports heat from the one end to the other end by the gas phase working fluid flowing from the one end (evaporation portion 41) of the container 19 to the other end (condensation portion 42). A part of the gas phase working fluid flowing to the other end of the container 19 releases latent heat and changes phase to the liquid phase working fluid L, and the released latent heat is transferred to the second heat dissipation fin 22 thermally connected to the heat transport member 10. The heat transferred to the second heat dissipating fins 22 is released to the external environment of the heat sink 1 through the second heat dissipating fins 22. The working fluid L that has changed into a liquid phase at the other end of the container 19 flows back from the other end to one end of the container 19 by the capillary force of the first capillary structure 14.

[0100] In addition, since the hollow portion 13 of the container 19 is connected to the internal space of the tube body 31, the working fluid that has changed from the liquid phase to the gas phase at one end (evaporation portion 41) of the container 19 and has not changed from the liquid phase at the other end (condensation portion 42) of the container 19 flows from the hollow portion 13 into the internal space of the tube body 31. The gas phase working fluid that has flowed into the internal space of the tube body 31 releases latent heat inside the tube body 31, thereby changing phase to the liquid phase working fluid L. The latent heat released inside the tube body 31 is transferred to the first heat dissipation fin 21 that is thermally connected to the tube body 31. The heat transferred to the first heat dissipation fin 21 is released to the external environment of the radiator 1 via the first heat dissipation fin 21. The working fluid L that has changed from the gas phase to the liquid phase inside the tube body 31 flows back from the top end portion 33 and the central portion of the tube body 31 that are the flat portion 37 to the base portion 32 of the tube body 31 that are the circular portion 36 through the capillary force of the second capillary structure 34 on the inner surface of the tube body 31. The liquid working fluid L flowing back to the base 32 of the tube 31 flows back from the base 32 of the tube 31 to the first capillary structure 14. The liquid working fluid L flowing back to the first capillary structure 14 flows back from the other end of the container 19 to one end of the container 19 by the capillary force of the first capillary structure 14.

[0101] In the heat sink 1, the tube 31 has a circular portion 36 having a circular shape in the radial direction and a flat portion 37 having a flat shape in the radial direction, and the circular portion 36 is located in the connection portion 30 connected to the heat transport member 10. Therefore, the pressure loss of the gas-phase working fluid in the connection portion 30 is reduced, and the flow characteristics of the gas-phase working fluid are excellent. In addition, the radial shape of the tube 31 in the connection portion 30 is circular. Therefore, even if the number of tubes 31 provided is increased to improve the cooling characteristics of the heat sink 1, it is possible to ensure a sufficient interval between the tubes 31 at the base 32 of the tube 31 located in the connection portion 30, so that excellent cooling performance can be obtained, and cracks (cracks) can be prevented from being generated in the heat transport member 10 at the portion between the tubes 31 due to contact between the tubes 31 and the heat transport member 10, for example, contact between the tubes 31 and the heat transport member 10 during the operation of attaching the tubes 31 to the heat transport member 10. Since cracks (cracks) can be prevented from being generated in the heat transport member 10, the solder or other bonding material that fixes the tube body 31 to the heat transport member 10 can be prevented from intruding into the internal space of the tube body 31 and the heat transport member 10 through the cracks (cracks). As a result, it is possible to prevent the capillary force from being reduced due to the bonding material such as solder being absorbed by a member having a capillary force such as a connecting member 35 provided in the internal space of the tube body 31 and the heat transport member 10. In addition, since cracks (cracks) can be prevented from being generated in the heat transport member 10, it is possible to prevent the leakage of the gas phase working fluid (1eak). In addition, in the heat sink 1, by locating the flat portion 37 of the tube body 31 at a location that is thermally connected to the heat dissipation fin group 20, the heat sink 1 can be space-saving.

[0102] In addition, in the heat sink 1, the heat transport member 10 whose internal space is integrated transports the heat of the heat generating element 100 from the evaporation portion 41 to the connection portion 30 connected to the tube body 31, and the tube body 31 is thermally connected to the heat dissipation fin group 20, so that the flow characteristics of the working fluid are excellent, and even if the heat generated from the heat generating element 100 increases, the heat input in the evaporation portion 41 can be made uniform, thereby reducing the thermal resistance in the evaporation portion 41. In addition, in the heat sink 1, since the internal space of the heat transport member 10 is entirely connected and integrated, even if the heat generated by the heat generating element 100 is uneven, the entire heat generating element 100 can be uniformly cooled.

[0103] In addition, in the heat sink 1, the tube body 31 has an inclined portion 39 between the circular portion 36 and the flat portion 37, which is inclined from the flat portion 37 toward the circular portion 36. Therefore, the reflux of the liquid-phase working fluid from the tube body 31 to the heat transport member 10 is smoother, and the reflux characteristics of the liquid-phase working fluid from the tube body 31 to the heat transport member 10 are further improved.

[0104] In the heat sink 1 , since the heat transport member 10 is a flat type extending on the same plane, the heat transport member 10 saves space, especially in the thickness direction of the heat transport member 10 , and the heat sink 1 can be installed even in a narrow space.

[0105] Next, a heat sink according to a second embodiment of the present invention will be described with reference to the accompanying drawings. In addition, since the main parts of the heat sink according to the second embodiment are the same as those of the first embodiment, the same reference numerals are used to describe the same components. Figure 6 It is a perspective view explaining the outline of the heat sink which concerns on 2nd Embodiment of this invention. Figure 7 is a side view schematically illustrating a radiator according to a second embodiment of the present invention; Figure 8 is a perspective view schematically illustrating the interior of a radiator according to a second embodiment of the present invention; Fig. 9 It is an explanatory diagram schematically showing a connection portion between a heat transport member and a pipe body of a radiator according to a second embodiment of the present invention. Fig.10 It is a side view explaining the outline of the inside of the heat sink which concerns on the 2nd Embodiment of this invention.

[0106] In the heat sink 1 according to the first embodiment, the heat transport member 10 is a planar type extending on the same plane, but instead, Figures 6 to 8 As shown, in the radiator 2 involved in the second embodiment, the heat transport component 10 has a heat dissipation side step portion 50 between the insulation portion 43 located between the evaporation portion 41 and the condensation portion 42 and the condensation portion 42, and the heat dissipation side step portion 50 is provided with a step in a direction that is not parallel to the heat transport direction of the heat transport component 10.

[0107] In the radiator 2, the heat dissipation side step portion 50 is a step in a direction substantially orthogonal to the heat transport direction of the heat transport member 10. In addition, the heat dissipation side step portion 50 is a step in a direction substantially vertical to the installation surface of the radiator 2. By providing the heat dissipation side step portion 50, in an environment where the installation space of the radiator 2 is limited, the radiator 2 can be installed even if there is a prohibited area 101 in the installation space near the condenser 42.

[0108] The heat dissipation side step portion 50 is formed by a step portion 51 and a step portion 52. The step portion 51 is a step in a direction substantially orthogonal to the heat transport direction of the heat transport member 10 provided on the plate-like body 11 on one side, and the step portion 52 is a step in a direction substantially orthogonal to the heat transport direction of the heat transport member 10 provided on the plate-like body 12 on the other side. Therefore, in the plate-like body 11 on one side, the heat insulating portion 43 and the condensing portion 42 are not located on the same plane. In addition, in the plate-like body 12 on the other side, the heat insulating portion 43 and the condensing portion 42 are also not located on the same plane.

[0109] In addition, if Figures 6 to 8 As shown, in the radiator 2 , the heat transport member 10 has a heat receiving side stepped portion 60 between the evaporation portion 41 and the heat insulating portion 43 , and the heat receiving side stepped portion 60 is stepped in a direction not parallel to the heat transport direction of the heat transport member 10 .

[0110] In the radiator 2, the heat receiving side step portion 60 is a step in a direction substantially orthogonal to the heat transport direction of the heat transport member 10. In addition, the heat receiving side step portion 60 is a step in a direction substantially perpendicular to the installation surface of the radiator 2. By providing the heat receiving side step portion 60, in an environment where the installation space of the radiator 2 is limited, the radiator 2 can be installed even if there is a prohibited area 101 in the installation space near the evaporation portion 41.

[0111] The heat receiving side step portion 60 is formed by a step portion 61 which is a step in a direction substantially orthogonal to the heat transport direction of the heat transport member 10 provided on the plate-like body 11 on one side. The step forming the heat receiving side step portion 60 is not provided on the plate-like body 12 on the other side. Therefore, in the plate-like body 11 on one side, the heat insulating portion 43 and the evaporation portion 41 are not located on the same plane. On the other hand, in the plate-like body 12 on the other side, the heat insulating portion 43 and the evaporation portion 41 are located on the same plane.

[0112] like Figure 6 , 8As shown, in the heat sink 2, the first capillary structure 14 has a first step portion 70 that follows the step of the heat dissipation side step portion 50. That is, the first step portion 70 is provided at a portion between the heat insulating portion 43 and the condensing portion 42 of the heat transport member 10 in the first capillary structure 14. The step of the first step portion 70 is provided in a direction that is not parallel to the heat transport direction of the heat transport member 10. In the heat sink 2, the heat dissipation side step portion 50 becomes a step in a direction that is substantially orthogonal to the heat transport direction of the heat transport member 10, and correspondingly, the first step portion 70 becomes a step in a direction that is substantially orthogonal to the heat transport direction of the heat transport member 10. In addition, the heat dissipation side step portion 50 becomes a step in a direction that is substantially vertical to the installation surface of the heat sink 2, and correspondingly, the first step portion 70 becomes a step in a direction that is substantially vertical to the installation surface of the heat sink 2. Moreover, the heat dissipation side step portion 50 becomes a step from the insulation portion 43 toward the condensation portion 42 and in the direction of the installation surface of the radiator 2. Correspondingly, the first step portion 70 becomes a step from the insulation portion 43 toward the condensation portion 42 and in the direction of the installation surface of the radiator 2.

[0113] The first step portion 70 is formed by a step portion 71 and a step portion 72, wherein the step portion 71 is a step provided on the side of the heat insulating portion 43 in a direction substantially orthogonal to the heat transport direction of the heat transport member 10, and the step portion 72 is a step provided on the side of the condensation portion 42 in a direction substantially orthogonal to the heat transport direction of the heat transport member 10. Therefore, on the side of the plate-like body 11 on one side, the first capillary structure 14 at the heat insulating portion 43 and the part at the condensation portion 42 are not located on the same plane. In addition, on the side of the plate-like body 12 on the other side, the first capillary structure 14 at the heat insulating portion 43 and the part at the condensation portion 42 are also not located on the same plane. As described above, the part of the first capillary structure 14 at the condensation portion 42 is closer to the installation surface of the heat sink 1 than the part at the heat insulating portion 43.

[0114] In addition, if Figure 6 , 8As shown, the first capillary structure 14 has a second step portion 80 following the step of the heat receiving side step portion 60. That is, the second step portion 80 is provided at a portion between the heat insulating portion 43 and the evaporating portion 41 of the heat transport member 10. The step of the second step portion 80 is provided in a direction that is not parallel to the heat transport direction of the heat transport member 10. In the radiator 2, the heat receiving side step portion 60 is a step in a direction substantially perpendicular to the heat transport direction of the heat transport member 10, and correspondingly, the second step portion 80 is a step in a direction substantially perpendicular to the heat transport direction of the heat transport member 10. In addition, the heat receiving side step portion 60 is a step in a direction substantially perpendicular to the installation surface of the radiator 2, and correspondingly, the second step portion 80 is a step in a direction substantially perpendicular to the installation surface of the radiator 2. The heat receiving side step portion 60 is a step extending from the heat insulating portion 43 toward the evaporation portion 41 in the direction of the installation surface of the radiator 2 . Accordingly, the second step portion 80 is a step extending from the heat insulating portion 43 toward the evaporation portion 41 in the direction of the installation surface of the radiator 2 .

[0115] The second step portion 80 is formed by a step portion 81, which is a step provided on the side of the heat insulating portion 43 in a direction substantially perpendicular to the heat transport direction of the heat transport member 10, and a step portion 82, which is a step provided on the side of the evaporation portion 41 in a direction substantially perpendicular to the heat transport direction of the heat transport member 10. Therefore, the first capillary structure 14 is not located on the same plane in the portion located in the heat insulating portion 43 and the portion located in the evaporation portion 41 on the side of the plate-like body 11 on one side. In addition, the first capillary structure 14 is not located on the same plane in the portion located in the heat insulating portion 43 and the portion located in the evaporation portion 41 on the side of the plate-like body 12 on the other side. As described above, the portion of the first capillary structure 14 located in the evaporation portion 41 is closer to the installation surface of the heat sink 2 than the portion located in the heat insulating portion 43.

[0116] like Figures 6 to 8 As shown, in the heat sink 2, the tube body 31 has: a circular portion 36 having a circular shape in the direction (radial direction) perpendicular to the longitudinal direction; and a flat portion 37 having a flat shape in the direction (radial direction) perpendicular to the longitudinal direction. The circular portion 36 of the tube body 31 is located at the connection portion 30 connected to the heat transport member 10, and the flat portion 37 of the tube body 31 is located at a location where the plurality of heat dissipation fins 21, 21, 21, ... are thermally connected.

[0117] like Fig. 9 As shown, in the heat sink 2 , in the tube body 31 , the boundary portion 38 between the round portion 36 and the flat portion 37 forms an inclined portion 39 that slopes from the flat portion 37 toward the round portion 36 .

[0118] In addition, if Fig. 9As shown, in the heat sink 2 , the first capillary structure 14 provided in the heat transport member 10 may be connected to the second capillary structure 34 provided in the tube 31 via the connecting member 35 located in the connecting portion 30 .

[0119] like Fig.10 As shown, in the radiator 2, in order to avoid the prohibited area 101, even if the heat transport member 10 has the heat dissipation side step portion 50 and the heat receiving side step portion 60, since the first capillary structure 14 has the first step portion 70 following the step of the heat dissipation side step portion 50 and the second step portion 80 following the step of the heat receiving side step portion 60, the working fluid L that changes into a liquid phase at the other end of the container 19 can also flow from the other end of the container 19 through the heat dissipation side step portion 50 and the heat receiving side step portion 60 by the capillary force of the first capillary structure 14 and flow back to one end of the container 19.

[0120] In the heat sink 2, the tube 31 also has a circular portion 36 having a circular shape in the radial direction and a flat portion 37 having a flat shape in the radial direction. The circular portion 36 is located in the connection portion 30 connected to the heat transport member 10. Therefore, the pressure loss of the gas-phase working fluid in the connection portion 30 is reduced, and the flow characteristics of the gas-phase working fluid are excellent. In addition, since the radial shape of the tube 31 in the connection portion 30 is circular, even if the number of tubes 31 is increased in order to improve the cooling characteristics of the heat sink 1, the interval between the tubes 31 can be sufficiently ensured at the base 32 of the tube 31 located in the connection portion 30, so that excellent cooling performance can be obtained, and cracks (cracks) in the heat transport member 10 at the portion between the tubes 31 due to contact between the tubes 31 and the heat transport member 10 can be prevented.

[0121] Next, other embodiments of the heat sink of the utility model are described below. In the heat sinks of the above embodiments, the first capillary structure 14 is connected to the second capillary structure 34 via the connecting member 35 located at the connecting portion 30, but the connecting member 35 may not be provided, and the first capillary structure 14 may be connected to the second capillary structure 34 without the connecting member 35.

[0122] Industrial Applicability

[0123] The heat sink of the utility model saves space, and has excellent flow characteristics and cooling performance of the gas phase working fluid. In addition, it can prevent leakage of the gas phase working fluid. Therefore, it has high utilization value in the field of cooling high-heat electronic components mounted on circuit substrates set in narrow spaces, such as central processing units and other electronic components.

Claims

1. A heat sink, wherein: have: a heat transport member having an evaporation portion thermally connected to the heat generating body; a tube body connected by a connecting portion located at the condensing portion of the heat transport member and having a heat transport direction different from the heat transport direction of the heat transport member; as well as The heat dissipation fin group is thermally connected to the tube body and is equipped with a plurality of heat dissipation fins. The heat transport member has an integral internal space that communicates from the evaporation portion to the connection portion connected to the tube body and is filled with a working fluid. The internal space of the heat transport member is connected to the internal space of the tube body via the connecting portion. The tube body has a circular portion with a circular shape in the radial direction and a flat portion with a flat shape in the radial direction. The circular portion is located at the connecting portion, and the flat portion is located at a position thermally connected to the heat dissipation fin group.

2. The heat sink according to claim 1, wherein: A first capillary structure extending from the evaporation portion toward the condensation portion is disposed in the inner space of the heat transport member, and a second capillary structure is disposed in the inner space of the tube.

3. The heat sink according to claim 2, wherein: The first capillary structure is connected to the second capillary structure via a connecting member located at the connecting portion.

4. The heat sink according to claim 3, wherein: The connecting member is a capillary member having a capillary force.

5. The radiator according to any one of claims 1 to 4, wherein: The tube body has an inclined portion between the circular portion and the flat portion, the inclined portion being inclined from the flat portion toward the circular portion.

6. The radiator according to any one of claims 1 to 4, wherein: The heat transport member is of a planar type extending on the same plane.

7. The heat sink according to any one of claims 1 to 4, wherein: The heat transport member includes a heat dissipation side stepped portion between a heat insulating portion located between the evaporation portion and the condensation portion and the condensation portion, wherein the heat dissipation side stepped portion is stepped in a direction not parallel to a heat transport direction of the heat transport member.

8. The heat sink according to claim 7, wherein: The heat transport member includes a heat receiving side stepped portion between the evaporation portion and the heat insulating portion, and the heat receiving side stepped portion is provided with a step in a direction not parallel to a heat transport direction of the heat transport member.

9. The heat sink according to any one of claims 1 to 4, wherein: The tube body extends along the configuration direction of the plurality of heat dissipation fins.

10. The heat sink according to any one of claims 1 to 4, wherein: The tubes are provided in plurality and extend from the heat transport member in a plurality of directions.

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