Radiator

Abstract

The utility model provides a radiator which can prevent the radiator from becoming dry under the condition that the heat transfer characteristic is not affected even if the application environment temperature is lower than the melting point of working fluid. The present invention is provided with: a heat transport member having a heat receiving part thermally connected to a heat generating body; and a first fin group in which a plurality of first fins are disposed and which is thermally connected to the heat dissipation section of the heat transport member, the heat transport member having a first internal space in which a first working fluid is sealed and which communicates from the heat receiving section to the heat dissipation section, and a second internal space in which a second working fluid is sealed. A heat transfer member is thermally connected to a heat insulation portion of the heat transfer member between the heat receiving portion and the heat dissipation portion.

Description

Technical Field

[0001] The utility model relates to a radiator for cooling heating bodies such as electrical and electronic components. Background Art

[0002] As electronic devices become more advanced in functionality, they are densely packed with multiple components, including heat-generating elements such as electronic components. Furthermore, as electronic devices become more advanced in functionality, the amount of heat generated by these heat-generating elements is also increasing. Heat pipes with a working fluid sealed within a decompressed internal space, steam chambers with a working fluid sealed within a decompressed internal space, and radiators incorporating these heat pipes or steam chambers are used to cool these heat-generating elements.

[0003] If the operating environment temperature of a heat pipe or steam chamber is lower than the melting point of the working fluid, the working fluid enclosed in the interior of the heat pipe or steam chamber freezes. Therefore, if the operating environment temperature of a heat pipe or steam chamber is lower than the melting point of the working fluid, and the heat pipe or steam chamber receives heat from the object being cooled, i.e., the heating element, the heat pipe or steam chamber begins to operate with the working fluid frozen.

[0004] like Figure 5 As shown, in conventional heat sink 101, when the working fluid is frozen and heat transport section 110, such as a heat pipe or vapor chamber, receives a predetermined amount of heat Qin from heat generator 100 at heat receiving section 141, the frozen solid-phase working fluid 200 changes phase into vapor-phase working fluid 201 at heat receiving section 141. Vapor-phase working fluid 201 flows from heat receiving section 141 through heat insulating section 142 of heat transport section 110 to heat dissipation section 143 of heat transport section 110, which is thermally connected to heat sink assembly 120. Vapor-phase working fluid 201 flowing to heat sink 143 changes phase into liquid-phase working fluid 202 due to heat exchange with heat sink assembly 120, releasing a predetermined amount of heat Qout as latent heat.

[0005] However, if the ambient temperature of the heat sink 101 is lower than the melting point of the working fluid, the liquid working fluid 202 may freeze in the heat dissipation section 143 and transform into the solid working fluid 200. If the liquid working fluid 202 freezes in the heat dissipation section 143, the working fluid cannot flow back from the heat dissipation section 143 to the heat receiving section 141, and the heat transport section 110 may dry out.

[0006] Patent document 1 proposes a radiator in which a heat transport portion receives heat from a heat generating element in a heat receiving portion, a working fluid changes phase into a gas-phase working fluid in the heat receiving portion, and the gas-phase working fluid flows from the heat receiving portion through a heat insulating portion of the heat transport portion to a heat dissipation portion 143 of the heat transport portion that is thermally connected to a heat sink group. The gas-phase working fluid flowing to the heat dissipation portion changes phase into a liquid-phase working fluid under the heat exchange action of the heat sink group and releases latent heat.

[0007] In Patent Document 1, the intermediate portion between the heat receiving portion at one end of the heat transport section and the heat dissipating portion at the other end functions as a heat insulating portion. The heat insulating portion is a portion that is not thermally connected to either the heat sink assembly or the heating element. Therefore, in the heat sink of Patent Document 1, the heat insulating portion is a portion that neither actively supplies heat to the heat transport member nor actively dissipates heat from the heat transport member.

[0008] Therefore, to prevent the working fluid from freezing, a proposal has been made to use water containing glycols as the working fluid for heat pipes (Patent Document 1). In Patent Document 1, by using water containing glycols, which has a lower melting point than pure water, as the working fluid, the working fluid can flow back from the heat dissipation section to the heat reception section without freezing, even when the ambient temperature of the heat pipe or steam chamber is low, thereby preventing the working fluid from drying out.

[0009] However, Patent Document 1 has a problem of reducing the heat transfer characteristics of the heat pipe because an organic solvent such as glycols is mixed into the working fluid. Furthermore, Patent Document 1 has a problem of reducing the long-term reliability of the heat transfer characteristics because the organic solvent is sealed into the interior space of the heat pipe.

[0010] Prior art literature

[0011] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-176752

[0012] Patent Document 2: Japanese Patent Application Laid-Open No. 2005-009752 Utility Model Content

[0013] Problems to be solved by the utility model

[0014] In view of the above, an object of the present invention is to provide a heat sink that does not affect heat transfer characteristics and can prevent drying out even when the application environment temperature is lower than the melting point of the working fluid.

[0015] Technical solutions to the problem

[0016] The structural features of the radiator of the present invention are as follows.

[0017] [1] comprising: a heat transport member having a heat receiving portion thermally connected to a heat generating element; and a first heat sink group thermally connected to the heat radiating portion of the heat transport member and including a plurality of first heat sinks.

[0018] The heat transport member has a first internal space communicating from the heat receiving portion to the heat dissipating portion and enclosing a first working fluid.

[0019] A heat transfer member is thermally connected to the heat insulating portion of the heat transport member located between the heat receiving portion and the heat dissipating portion.

[0020] [2] The heat sink according to [1], wherein the heat transfer member is a heat exchange member.

[0021] [3] The heat sink according to [2], wherein the heat exchange member is a second fin group configured with a plurality of second fins.

[0022] [4] The heat sink according to [3], wherein the fin area of the second fin group is smaller than the fin area of the first fin group.

[0023] [5] The heat sink according to [1], wherein the heat transfer member is a heat pipe having a second internal space in which a second working fluid is sealed.

[0024] [6] The heat sink according to [5], wherein the heat pipe extends from the heat insulating portion to the heat receiving portion.

[0025] [7] The heat sink according to any one of [1] to [6], wherein the heat transfer member is arranged at a predetermined distance from the first fin group.

[0026] [8] The heat sink according to any one of [1] to [7], wherein the internal space of the heat transport member is integrated.

[0027] [9] The heat sink according to any one of [1] to [8], wherein the heat dissipating portion of the heat transport member is wider than the heat receiving portion.

[0028] In the above-mentioned manner, the portion of the heat transport member that is thermally connected to the cooling object, i.e., the heat generating body, functions as a heat receiving portion, and the portion that is thermally connected to the first heat sink functions as a heat dissipation portion of the heat transport member. In addition, the portion between the heat receiving portion and the heat dissipation portion of the heat transport member functions as a heat insulating portion, and the heat insulating portion is thermally connected to a heat transfer member. In the heat receiving portion of the heat transport member, the working fluid (first working fluid) is heated by the heat generating body and changes from a liquid phase to a gas phase, and in the heat dissipation portion of the heat transport member, the gas phase working fluid releases latent heat and changes from a gas phase to a liquid phase. In addition, in the above-mentioned manner, the gas phase working fluid flows from the heat receiving portion of the heat transport member through the heat insulating portion to the heat dissipation portion, and the liquid phase working fluid flows from the heat dissipation portion of the heat transport member through the heat insulating portion to the heat receiving portion. Therefore, the heat of the heat generating body is transported from the heat receiving portion of the heat transport member to the heat dissipation portion of the heat transport member via the heat insulating portion through the heat transport member.

[0029] Furthermore, in the above-described embodiment, because the heat insulating portion is thermally connected to the heat transfer member, whenever heat from the heat-generating element is transferred from the heat receiving portion of the heat transfer member to the heat dissipating portion of the heat transfer member via the heat insulating portion, heat is also supplied to or dissipated from the heat sink via the heat insulating portion. In other words, in the heat sink of the present invention, the heat insulating portion actively supplies heat to or dissipates heat from the heat transfer member.

[0030] Utility model effect

[0031] In the radiator mode of the present invention, the heat transfer member is thermally connected to the insulating portion located between the heat receiving portion and the heat dissipating portion of the heat transport member. Thus, through the heat transfer effect of the heat transfer member, heat is supplied to the heat transport member or dissipated from the heat transport member in the insulating portion. Therefore, the working fluid (first working fluid) is heated in the insulating portion, or the working fluid dissipates heat in the insulating portion. The liquid-phase working fluid is heated in the insulating portion, so that the liquid-phase working fluid enclosed in the heat transport member flows from the heat receiving portion through the entire insulating portion and is heated. Furthermore, it is possible to prevent the liquid-phase working fluid enclosed in the heat transport member from freezing in the insulating portion and the heat dissipating portion adjacent to the insulating portion. In addition, by dissipating heat from the gas-phase working fluid in the insulating portion, a portion of the gas-phase working fluid changes from the gas phase to the liquid phase in the insulating portion adjacent to the heat receiving portion, rather than in the heat dissipating portion. Therefore, by changing the phase of a portion of the gas-phase working fluid flowing through the heat-insulating portion to a liquid phase, the return distance of the portion of the liquid-phase working fluid to the heat-receiving portion can be shortened, allowing the liquid-phase working fluid to flow smoothly back to the heat-receiving portion. Furthermore, since a portion of the gas-phase working fluid changes from a gas phase to a liquid phase in the heat-insulating portion, rather than in the heat-dissipating portion, which is more susceptible to freezing than the heat-receiving portion and the heat-insulating portion, freezing of the liquid-phase working fluid can be prevented.

[0032] As described above, according to the embodiment of the heat sink of the present invention, the heat transport characteristics can be maintained, and even when the operating environment temperature is lower than the melting point of the working fluid, the heat transport member can be prevented from drying out.

[0033] In the radiator embodiment of the present invention, the heat transfer member is a heat exchange member, and the heat exchange member is a second fin group equipped with a plurality of second fins. The heat exchange action of the second fin group allows heat to be smoothly released from the vapor-phase working fluid flowing through the heat insulating portion, thereby smoothly transforming the vapor-phase working fluid in the heat insulating portion into a liquid phase. Therefore, the radiator embodiment of the present invention facilitates the return of the liquid-phase working fluid to the heat receiving portion and reliably prevents freezing of the liquid-phase working fluid. This allows the heat transfer member to be more reliably prevented from drying out, even when the ambient operating temperature is below the melting point of the working fluid.

[0034] According to the radiator configuration of the present invention, the fin area of the second fin group serving as the heat transfer member is smaller than the fin area of the first fin group thermally connected to the heat dissipation portion. This prevents excessive promotion of heat dissipation from the heat insulating portion by the radiator. Therefore, even if the application environment temperature is lower than the melting point of the working fluid, the heat transfer member can be more reliably prevented from drying out.

[0035] According to the radiator configuration of the present invention, the heat transfer member is a heat pipe having a working fluid (second working fluid) enclosed within its internal space (second internal space). This allows for smooth heat transfer to the insulating portion of the heat transfer member, and promotes heating of the liquid-phase working fluid enclosed within the heat transfer member within the insulating portion. This more reliably prevents the liquid-phase working fluid within the heat transfer member from freezing within the insulating portion and the heat dissipation portion adjacent thereto. Therefore, according to the radiator configuration of the present invention, even when the ambient operating temperature is below the melting point of the working fluid, the heat transfer member can be more reliably prevented from drying out.

[0036] According to the radiator configuration of the present invention, the heat pipe extends from the heat-insulating portion of the heat transport member to the heat-receiving portion, thereby utilizing the heat transfer member, i.e., the heat pipe, to promote the transfer of heat from the heat-receiving portion of the heat transport member to the heat-insulating portion. Therefore, in the heat-insulating portion, the amount of heat received by the liquid-phase working fluid of the heat transport member is reliably increased, and freezing of the liquid-phase working fluid of the heat transport member in the heat-insulating portion and the heat-dissipating portion adjacent to the heat-insulating portion can be more reliably prevented.

[0037] According to the radiator configuration of the present invention, by arranging the heat transfer member at a predetermined interval from the first heat sink group, it is possible to prevent excessive promotion of heat dissipation of the entire radiator. Therefore, even if the application environment temperature is lower than the melting point of the working fluid, it is possible to more reliably prevent the heat transfer member from drying out.

[0038] According to the heat sink of the present invention, the internal space of the heat transport member is integrated, so even if the heat generating element generates uneven heat, the entire heat generating element can be cooled uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a perspective view explaining the outline of the heat sink according to the first embodiment of the present invention.

[0040] Figure 2 This is a side view illustrating an outline of a heat sink according to a first embodiment of the present invention.

[0041] Figure 3 It is a plan view illustrating an outline of a heat sink according to a second embodiment of the present invention.

[0042] Figure 4 It is a perspective view explaining the outline of a heat sink according to a third embodiment of the present invention.

[0043] Figure 5 It is a side view explaining the outline of a conventional radiator. DETAILED DESCRIPTION

[0044] Hereinafter, a heat sink according to an embodiment of the present invention will be described using the drawings. First, a heat sink according to a 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 according to the first embodiment of the present invention.

[0045] like Figure 1 、 2 As shown, a heat sink 1 according to a first embodiment of the present invention includes a heat transport member 10 having a heat receiving portion (evaporation portion) 41 thermally connected to a heat generating element 100, and a first fin group 20 thermally connected to the heat transport member 10. The heat transport member 10 includes a single heat transport member 10. The portion of the heat transport member 10 where the first fin group 20 is thermally connected is the heat dissipation portion (condensation portion) 42. The first fin group 20 is thermally connected to the heat transport member 10 at the heat dissipation portion 42 of the heat transport member 10.

[0046] Heat transport member 10 includes a container 19 having a hollow cavity; a working fluid (first working fluid) flowing through the cavity. A capillary structure (not shown) with capillary force is housed within the cavity. Container 19 is formed by overlapping a plate-like body 11 on one side with a plate-like body 12 on the other side facing the plate-like body 11.

[0047] The plate-like body 11 on one side is in the shape of a plate having side walls erected from the plane portion at the edge of the plane portion. The plate-like body 12 on the other side is also in the shape of a plate having side walls 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 both concave. By overlapping the concave plate-like body 11 on one side with the concave plate-like body 12 on the other side, a container 19 having a hollow portion is formed. Therefore, the shape of the container 19 is a planar type, and the heat transport component 10 is a steam chamber. The internal space (first internal space) of the container 19, i.e., the hollow portion, is sealed relative to the external environment and is depressurized by exhaust treatment.

[0048] The internal space of the heat transport member 10 communicates from the heat receiving portion 41 to the heat dissipating portion 42, and a working fluid is sealed in the internal space of the heat transport member 10. The internal space of the heat transport member 10 is integrally formed.

[0049] The portion of the outer surface of container 19 that is thermally connected to the heating element 100, the object to be cooled, is heat-receiving portion 41. Through the thermal connection between heating element 100 and container 19, heating element 100 is cooled by the cooling action of radiator 1. Heat transfer member 10 has heat-receiving portion 41 formed at one end, since heating element 100 is thermally connected to one end. Furthermore, heating element 100 is thermally connected to plate-like member 11 on one side of the outer surface of container 19.

[0050] The heat transport member 10 extends in a predetermined direction from the position of the heat generating element 100 and is thermally connected to the first fin group 20 at its other end, which is opposite to one end of the container 19. The other end of the heat transport member 10 thermally connected to the first fin group 20 functions as the heat dissipation portion 42 of the heat transport member 10.

[0051] The heat dissipating portion 42 of the heat transport member 10 is wider than the heat receiving portion 41. In the radiator 1, the heat dissipating portion 42 of the heat transport member 10 extends along the planar direction of the heat transport member 10 and in a direction (width direction W) substantially orthogonal to the heat transport direction H of the heat transport member 10. Furthermore, the heat dissipating portion 42 of the heat transport member 10 extends in two directions. In the radiator 1, because the heat dissipating portion 42 extends in a direction that is not parallel to the heat transport direction H of the heat transport member 10, heat transferred from the heat transport member 10 is diffused through the heat dissipating portion 42 in a direction different from the direction in which the heat transport member 10 extends. This prevents the heat dissipating portion 42 from increasing in size in the heat transport direction H of the heat transport member 10, thereby reducing space requirements for the heat dissipating portion 42. Furthermore, because the heat dissipating portion 42 of the heat transport member 10 is wider than the heat receiving portion 41, the number of first heat dissipating fins 21 constituting the first heat dissipating fin group 20 can be increased.

[0052] In the heat transport member 10, the intermediate portion in the heat transport direction H between the heat receiving portion 41 located at one end of the container 19 and the heat dissipating portion 42 located at the other end of the container 19 functions as a heat insulating portion 43. The heat receiving portion 41 is located at one end of the container 19, and the heat dissipating portion 42 is located at the other end of the container 19. The heat insulating portion 43 is a portion that is not thermally connected to either the first heat sink group 20 or the heat generating element 100. Heat transferred from the heat generating element 100 to the heat receiving portion 41 is transferred from the heat receiving portion 41 to the heat dissipating portion 42 via the heat insulating portion 43 along the extending direction of the heat transport member 10.

[0053] In the heat sink 1, the width direction W dimension of the heat insulating portion 43 is substantially the same as the width direction W dimension of the heat receiving portion 41. In the heat transport member 10, the heat receiving portion 41, the heat insulating portion 43, and the heat radiating portion 42 extend along the same plane.

[0054] In the radiator 1, the first fin group 20 includes a plurality of first fins 21, 21, 21, ..., erected on the outer surface of the heat dissipation portion 42. The plurality of first fins 21, 21, 21, ... are arranged side by side at predetermined intervals along the heat dissipation portion 42, which extends in a direction substantially perpendicular to the heat transfer direction H of the heat transfer member 10, forming the first fin group 20. In the radiator 1, the plurality of first fins 21, 21, 21, ..., forming the first fin group 20 are all substantially the same height.

[0055] In the heat sink 1, the first fin group 20 is provided on the plate-like body 11 on one side and the plate-like body 12 on the other side of the container 19. As described above, at the other end of the heat transport member 10 in the heat transport direction H, the first fins 21 are thermally connected to the container 19 in a state divided by the two surfaces of the container 19 (i.e., the plate-like body 11 on one side and the plate-like body 12 on the other side).

[0056] like Figure 1 、 2 As shown, in radiator 1, heat transfer member 39 is thermally connected to heat insulating portion 43 of heat transport member 10, located between heat receiving portion 41 and heat dissipating portion 42. In radiator 1, heat transfer member 39 is used as a heat exchange member. Specifically, a second fin group 30 including a plurality of second fins 31, 31, 31, ... is provided as the heat exchange member.

[0057] Second fins 31 are erected on the outer surface of the heat insulating portion 43 of the heat transport member 10, and the container 19 is thermally connected to the second fins 31. As described above, in the radiator 1, the heat insulating portion 43 is the portion that actively dissipates heat from the heat transport member 10. The second fins 31 are erected on the plate-like body 12 of the heat transport member 10, on the other side of the container 19 from the heat insulating portion 43. Furthermore, the second fins 31 are erected on the outer surface of the heat insulating portion 43, with their main surfaces substantially parallel to the main surfaces of the first fins 21. Furthermore, a plurality of second fins 31 are arranged side by side at predetermined intervals along the width direction W of the heat transport member 10. The plurality of second fins 31, 31, 31, ... are arranged side by side to form a second fin group 30. In the radiator 1, the plurality of second fins 31, 31, 31, ... forming the second fin group 30 are all of substantially the same height. Furthermore, in the radiator 1, the second fins 31 are lower than the first fins 21.

[0058] On the other hand, the second fins 31 are not provided upright on the plate 11 on the container 19 side of the heat insulating portion 43 of the heat transport member 10. In addition, the heat transfer member 39, namely the second fins 31, are not provided on the heat receiving portion 41 of the heat transport member 10.

[0059] In radiator 1, the fin area of the second fin group 30 is smaller than that of the first fin group 20. That is, the total fin area of all second fins 31, 31, 31, ..., constituting the second fin group 30 is smaller than the total fin area of all first fins 21, 21, 21, ..., constituting the first fin group 20. As described above, the amount of heat dissipated by the second fin group 30 is smaller than that of the first fin group 20. In other words, the cooling characteristics of the first fin group 20, constituting the heat dissipation portion 42, are superior to those of the heat transfer member 39 disposed on the heat insulating portion 43, i.e., the second fin group 30. As described above, in radiator 1, the cooling characteristics of the heat dissipation portion 42 are superior to those of the heat insulating portion 43, and therefore the heat dissipation portion 42 and the heat insulating portion 43 have different functions and structures.

[0060] The fin area refers to the area of the main surface of the thin plate-shaped fins (the first fins 21 and the second fins 31 ).

[0061] Furthermore, in the radiator 1, the fin area of each second fin 31 is smaller than the fin area of each first fin 21. Furthermore, in the radiator 1, the number of second fins 31 provided is smaller than the number of first fins 21 provided. Furthermore, even if the fin area of each second fin 31 is greater than or equal to the fin area of each first fin 21, or even if the number of second fins 31 provided is greater than or equal to the number of first fins 21 provided, it is sufficient as long as the total fin area of all second fins 31, 31, 31, ..., constituting the second fin group 30 is smaller than the total fin area of all first fins 21, 21, 21, ..., constituting the first fin group 20.

[0062] In the radiator 1, the heat transfer member 39, namely the second fin group 30, is arranged at a predetermined distance 33 from the first fin group 20. Therefore, the second fin group 30 is not connected to the first fin group 20. Neither the heat transfer member 39 nor the first fin group 20 is provided at the boundary between the heat insulating portion 43 and the heat dissipating portion 42 of the heat transport member 10. Furthermore, no heat transfer member 39 is provided in the heat insulating portion 43 of the heat transport member 10 near the heat dissipating portion 42.

[0063] In radiator 1, heat from heating element 100 is transferred from heat receiving portion 41 through heat insulating portion 43, which is thermally connected to heat transfer member 39, i.e., second fin group 30, to heat dissipation portion 42, which is thermally connected to first fin group 20. Heat is then released to the external environment through heat exchange with first fin group 20 in heat dissipation portion 42. Furthermore, some heat from heating element 100 is released to the external environment through heat exchange with second fin group 30 in heat insulating portion 43.

[0064] A capillary structure (not shown) that generates capillary force is provided in the hollow portion of the container 19. For example, the capillary structure may be provided over the entire inner surface of the container 19. The capillary force of the capillary structure causes the working fluid, which has changed from a gas phase to a liquid phase at the heat dissipating portion 42 of the heat transport member 10, to flow back from the heat dissipating portion 42 of the heat transport member 10 to the heat receiving portion 41 via the heat insulating portion 43. Furthermore, the capillary force of the capillary structure causes the working fluid, which has changed from a gas phase to a liquid phase at the heat insulating portion 43 of the heat transport member 10, to flow back from the heat insulating portion 43 of the heat transport member 10 to the heat receiving portion 41.

[0065] The capillary structure is not particularly limited, and examples thereof include sintered bodies of metal powders such as copper powder, metal meshes composed of metal wires, non-woven fabrics, grooves (multiple fine grooves) formed on the inner surface of the container 19, or combinations thereof.

[0066] The gaseous working fluid can circulate throughout the container 19 through a steam flow path (not shown). The steam flow path is the internal space of the container 19 and extends across the entire container 19. In addition, as needed, in order to maintain the reduced pressure internal space of the container 19, a column (not shown) can be provided as a support portion in the steam flow path. Although there is no particular limitation on the column, in order to reduce the flow path resistance when the liquid-phase working fluid refluxes, for example, a column of a composite material formed by covering a capillary structure around a columnar metal member (for example, a copper member), a columnar sintered body of metal powder such as copper powder, etc. can be cited.

[0067] Examples of the material of the container 19 include stainless steel, copper, copper alloys, aluminum, aluminum alloys, tin, tin alloys, titanium, titanium alloys, nickel, and nickel alloys. The material of the first heat sink 21 and the second heat sink 31 is not particularly limited, and examples thereof include metal materials such as copper, copper alloys, aluminum, and aluminum alloys.

[0068] The working fluid sealed in the internal space of the container 19 can be appropriately selected according to its compatibility with the material of the container 19 , and for example, water can be selected.

[0069] The heat sink 1 can be forcedly cooled by a blower fan (not shown) as needed. The cooling air from the blower fan is supplied along the main surface of the first fin group 21, thereby accelerating the cooling of the first fin group 20.

[0070] Next, the mechanism of the cooling function of the heat sink 1 will be described. First, the heat source 100, an object to be cooled, is thermally connected to one end of the container 19 of the heat transport member 10. When the heat receiving portion 41 located at one end of the container 19 receives heat from the heat source 100, heat is transferred from the heat source 100 to the liquid-phase working fluid enclosed within the interior space of the container 19 within the heat receiving portion 41 of the heat transport member 10, causing the liquid-phase working fluid to transform into a vapor-phase working fluid. After the phase transformation, the vapor-phase working fluid flows from the heat receiving portion 41 of the heat transport member 10 through the heat insulating portion 43 located in the center of the heat transport member 10 to the heat dissipating portion 42 located at the other end of the container 19 in the vapor flow path. As the vapor-phase working fluid flows from the heat receiving portion 41 at one end of the container 19 through the heat insulating portion 43 to the heat dissipating portion 42 at the other end of the container 19, heat from the heat source 100 is transported from one end of the heat transport member 10 to the other end. The vapor-phase working fluid flowing from one end of the heat transport member 10 to the other is subjected to heat exchange by the first fin group 20, releasing latent heat and transforming from the vapor phase into the liquid phase. This released latent heat is transferred to the first fin group 20, which is thermally connected to the heat dissipation portion 42 of the heat transport member 10. Heat transferred from the container 19 to the first fin group 20 is released to the external environment of the radiator 1 via the first fin group 20. The working fluid, having released latent heat and transformed from the vapor phase into the liquid phase, flows back from the heat dissipation portion 42 of the heat transport member 10 through the heat insulating portion 43 to the heat receiving portion 41, utilizing the capillary force of the capillary structure provided in the container 19.

[0071] Furthermore, in the heat sink 1, as the vapor-phase working fluid flows from the heat receiving portion 41 of the heat transport member 10 to the insulating portion 43, a portion of the vapor-phase working fluid undergoes heat exchange with the heat transfer member 39, i.e., the second fin group 30, in the insulating portion 43, releasing latent heat and transforming from the vapor phase into the liquid phase. This released latent heat is then transferred to the second fin group 30, which is thermally connected to the insulating portion 43 of the heat transport member 10. Heat transferred from the container 19 to the second fin group 30 is released to the external environment of the heat sink 1 via the second fin group 30. The working fluid, which has released latent heat and transformed from the vapor phase into the liquid phase in the insulating portion 43, then flows back from the insulating portion 43 of the heat transport member 10 to the heat receiving portion 41 due to the capillary force of the capillary structure provided in the container 19.

[0072] In the radiator 1 according to the first embodiment of the present invention, the heat transfer member 39, namely the second fin group 30, is thermally connected to the insulating portion 43 located between the heat receiving portion 41 and the heat dissipating portion 42 of the heat transport member 10. This allows the heat exchange effect of the second fin group 30 to be dissipated from the radiator 1 at the insulating portion 43. Consequently, heat can be released from the working fluid at the insulating portion 43. By releasing heat from the vapor-phase working fluid at the insulating portion 43, a portion of the vapor-phase working fluid changes from the vapor phase to the liquid phase in the insulating portion 43 adjacent to the heat receiving portion 41, rather than in the heat dissipating portion 42. Consequently, the phase change of a portion of the vapor-phase working fluid flowing through the insulating portion 43 to the liquid phase shortens the return distance of the portion of the liquid-phase working fluid to the heat receiving portion 41, compared to working fluid that changes from the vapor phase to the liquid phase at the heat dissipating portion 42. This allows the liquid-phase working fluid to flow smoothly back to the heat receiving portion 41. Furthermore, since a portion of the vapor-phase working fluid transitions from the vapor phase to the liquid phase in the heat insulating portion 43, rather than in the heat radiating portion 42, which is more susceptible to freezing than the heat receiving portion 41 and the heat insulating portion 43, freezing of the liquid-phase working fluid can be prevented. Therefore, the embodiment of the heat sink 1 can prevent the heat transport characteristics from being affected and prevent the heat transport member 10 from drying out even when the operating ambient temperature is below the melting point of the working fluid.

[0073] Furthermore, in radiator 1, the heat transfer member 39 is the second fin group 30. This allows for smooth heat transfer from the vapor-phase working fluid flowing through the insulating portion 43 through heat exchange within the second fin group 30. This allows for a smooth phase transition of the vapor-phase working fluid within the insulating portion 43 to the liquid phase. Consequently, in radiator 1, the liquid-phase working fluid flows back to the heat receiving portion 41 more smoothly, reliably preventing the liquid-phase working fluid from freezing. This ensures that even when the ambient operating temperature is below the melting point of the working fluid, the heat transfer member 10 can be more reliably prevented from drying out.

[0074] Furthermore, in the radiator 1, the fin area of the second fin group 30 is smaller than the fin area of the first fin group 20 thermally connected to the heat dissipation portion 42. This prevents excessive promotion of heat dissipation from the radiator 1 in the heat insulating portion 43. Therefore, even when the operating ambient temperature is lower than the melting point of the working fluid, the heat transport member 10 can be more reliably prevented from drying out.

[0075] Furthermore, in the radiator 1, the heat transfer member 39, i.e., the second fin group 30, is arranged at a predetermined distance 33 from the first fin group 20. This prevents excessive promotion of heat dissipation from the entire radiator 1. Therefore, even when the operating ambient temperature is lower than the melting point of the working fluid, the heat transfer member 10 can be more reliably prevented from drying out.

[0076] Furthermore, in the heat sink 1 , the internal space of the heat transport member 10 is unified, so that even if uneven heat generation occurs in the heat generating element 100 , the entire heat generating element 100 can be uniformly cooled.

[0077] Next, a heat sink according to a second embodiment of the present invention will be described in detail. Since the heat sink according to the second embodiment has the same main components as the heat sink according to the first embodiment, the same components as those of the first embodiment will be described using the same reference numerals. Figure 3 It is a plan view illustrating an outline of a heat sink according to a second embodiment of the present invention.

[0078] In the heat sink 1 of the first embodiment, the heat exchange member, that is, the second fin group 30 is provided as the heat transfer member 39 in the heat insulating portion 43. Figure 3 As shown, in the radiator 2 of the second embodiment of the present invention, a heat pipe 35 having a working fluid (second working fluid) sealed in an internal space (second internal space) is thermally connected to the heat insulating portion 43 as a heat transfer member 39. In the radiator 2, a plurality of ( Figure 3 Heat pipes 35, 35, 35, ... are thermally connected to the outer surface of the heat insulating portion 43. Furthermore, the plurality of heat pipes 35, 35, 35, ... are arranged side by side along the width direction W of the heat transport member 10. The heat pipes 35 are attached to the outer surface of the plate-like body 12 on the other side, along the surface direction of the container 19 in the heat insulating portion 43 of the heat transport member 10.

[0079] The heat pipe 35 is a tubular body. The internal space of the heat pipe 35 is sealed from the external environment and is depressurized by exhaust. The heat pipe 35 is a heat transport member that transports heat along its length.

[0080] In the radiator 2, the container 19 widens from the heat receiving portion 41 toward the heat dissipating portion 42 along the heat insulating portion 43 in a plan view. Furthermore, among the plurality of heat pipes 35, 35, 35, ..., the heat pipe 35 located at the end in the width direction W of the heat transport member 10 has an outwardly curved portion.

[0081] like Figure 3 As shown, the heat pipe 35 extends from the heat-receiving portion 43 of the heat transport member 10 to the heat-receiving portion 41. Therefore, the heat pipe 35 is thermally connected to the heat-generating element 100 at the heat-receiving portion 41 via the container 19 of the heat transport member 10. As described above, the heat pipe 35, on the outer surface of the container 19, independently of the heat transport function of the heat transport member 10, transports heat from the heat-generating element 100 from the heat-receiving portion 41 of the heat transport member 10 to the heat-receiving portion 43. The portion of the heat pipe 35 corresponding to the heat-receiving portion 41 of the heat transport member 10 is the heat-receiving portion (evaporation portion) of the heat pipe 35, while the portion of the heat pipe 35 corresponding to the heat-receiving portion 43 of the heat transport member 10 is the heat-dissipating portion (condensation portion) of the heat pipe 35. As described above, in the radiator 2, the heat-receiving portion 43 is the portion that actively supplies heat to the heat transport member 10.

[0082] In the radiator 2, similarly, the heat transfer member 39, or heat pipe 35, is disposed at a predetermined distance 33 from the first fin group 20. Therefore, the heat pipe 35 is not connected to the first fin group 20. In other words, the heat pipe 35 does not extend to the first fin group 20 and is not thermally connected to the first fin group 20. As described above, in the radiator 2, similarly, neither the heat transfer member 39 nor the first fin group 20 is disposed at the boundary between the heat insulating portion 43 and the heat dissipating portion 42 of the heat transport member 10. Furthermore, no heat transfer member 39 is disposed near the heat dissipating portion 42 within the heat insulating portion 43 of the heat transport member 10.

[0083] As with the container 19 of the heat transport member 10, examples of the material of the container of the heat pipe 35 include stainless steel, copper, copper alloys, aluminum, aluminum alloys, tin, tin alloys, titanium, titanium alloys, nickel, and nickel alloys. The working fluid enclosed in the interior of the container of the heat pipe 35 can be appropriately selected based on its compatibility with the container material; for example, water can be selected.

[0084] Furthermore, similarly to the radiator 1 , in the radiator 2 , at the other end of the heat transport member 10 in the heat transport direction H, the first fin 21 is thermally connected to the container 19 so as to be divided by both surfaces of the container 19 .

[0085] In the radiator 2 according to the second embodiment of the present invention, a heat transfer member 39, namely a heat pipe 35, is thermally connected to the outer surface of a heat insulating portion 43 located between the heat receiving portion 41 and the heat dissipating portion 42 of the heat transport member 10. This allows heat transfer from the heat pipe 35 to the heat transport member 10 via the heat insulating portion 43 of the heat transport member 10. Consequently, in the radiator 2, the working fluid enclosed in the heat transport member 10 is heated in the heat insulating portion 43. The liquid-phase working fluid enclosed in the heat transport member 10 is heated in the heat insulating portion 43, thereby preventing the liquid-phase working fluid in the heat transport member 10 from flowing from the heat receiving portion 41 through the entire heat insulating portion 43 and being heated. Furthermore, freezing of the liquid-phase working fluid in the heat transport member 10 in the heat insulating portion 43 and the heat dissipating portion 42 adjacent to the heat insulating portion 43 can be prevented. Therefore, according to the embodiment of the heat sink 2 , the heat transport characteristics can be kept from being affected, and even if the operating environment temperature is lower than the melting point of the working fluid, the heat transport member 10 can be prevented from drying out.

[0086] Furthermore, in radiator 2, heat transfer member 39 is a heat pipe 35 with a working fluid enclosed within its interior space. This allows for smooth heat transfer to insulating portion 43 of heat transport member 10. In insulating portion 43, the liquid-phase working fluid enclosed in heat transport member 10 is heated, thereby more reliably preventing the liquid-phase working fluid enclosed in heat transport member 10 from freezing in insulating portion 43 and in heat dissipation portion 42 adjacent thereto. Consequently, radiator 2 can more reliably prevent the heat transport member 10 from drying out, even when the ambient operating temperature is below the melting point of the working fluid.

[0087] Furthermore, in the heat sink 2, the heat pipe 35 extends from the heat-insulating portion 43 of the heat transport member 10 to the heat-receiving portion 41. This facilitates heat transfer from the heat-receiving portion 41 of the heat transport member 10 to the heat-insulating portion 43 by utilizing the heat transfer member 39, i.e., the heat pipe 35. Consequently, the amount of heat received by the liquid-phase working fluid enclosed in the heat transport member 10 in the heat-insulating portion 43 is reliably increased, thereby reliably preventing the liquid-phase working fluid in the heat transport member 10 from freezing in the heat-insulating portion 43 and the heat-dissipating portion 42 adjacent thereto.

[0088] Furthermore, in the radiator 2, the heat transfer member 39, i.e., the heat pipe 35, is arranged at a predetermined distance 33 from the first fin group 20. This prevents excessive heat dissipation from the entire radiator 2. Therefore, even when the operating ambient temperature is lower than the melting point of the working fluid, the heat transfer member 10 can be more reliably prevented from drying out.

[0089] Next, a heat sink according to a third embodiment of the present invention will be described in detail. The heat sink according to the third embodiment shares the same major components with the heat sinks according to the first and second embodiments, and thus, the same components as those in the first and second embodiments are described using the same reference numerals. Figure 4 It is a perspective view explaining the outline of a heat sink according to a third embodiment of the present invention.

[0090] In the heat sinks 1 and 2 of the first and second embodiments, the container 19 of the heat transport member 10 is flat, and the entire internal space of the container 19 is an integrally formed steam chamber. Figure 4 As shown, in the radiator 3 of the third embodiment, the heat transport member 10 is a heat pipe group 60 comprising a plurality of heat pipes 61, 61, 61, ... arranged in parallel. In the radiator 3, the heat transport member 10, i.e., the heat pipe group 60, has its insulating portion 43 flattened. A plurality of second fins 31, 31, 31, ... are erected on the outer surface of the flattened heat pipe group 60, forming a second fin group 30. Similarly, in the radiator 3, the heat transfer member 39, i.e., the second fin group 30, is arranged at a predetermined distance 33 from the first fin group 20.

[0091] In the radiator 3, the heat transport member 10 is a heat pipe bank 60 formed by juxtaposing multiple heat pipes 61, 61, 61, ..., so the internal space of the heat transport member 10 is divided into multiple sections. The heat pipes 61 are tubular bodies with radial and longitudinal directions. The heat pipes 61 contain a working fluid within their internal space, and the internal space of the heat pipes 61 is depressurized by exhaust. Due to this internal structure, the heat pipes 61 function as heat transport members.

[0092] In the heat receiving portion 41 and the heat insulating portion 43 of the heat transport member 10, i.e., the heat pipe group 60, multiple heat pipes 61, 61, 61, ... are arranged side by side in the radial direction of the heat pipes 61. Meanwhile, the heat dissipating portion 42 of the heat transport member 10 is wider than the heat receiving portion 41 and the heat insulating portion 43. Accordingly, the heat pipes 61 in the heat dissipating portion 42 of the heat transport member 10, i.e., the heat pipe group 60, are bent into an L-shape. The heat pipes 61 on the left side of the heat pipe group 60 bend leftward in the heat dissipating portion 42, extending the heat dissipating portion 42 to the left. The heat pipes 61 on the right side of the heat pipe group 60 bend rightward in the heat dissipating portion 42, extending the heat dissipating portion 42 to the right.

[0093] The second fin group 30 comprises a plurality of second fins 31, 31, 31, ..., arranged upright on a single plate 32. The plurality of second fins 31, 31, 31, ... are fixed to the plate 32. Thus, the plurality of second fins 31, 31, 31, ... are integrated by the plate 32. The plate 32 of the second fin group 30 extends in the width direction W of the heat transport member 10 and contacts the outer surface of the flattened heat pipe group 60.

[0094] Similarly, in the radiator 3, the heat transfer member 39, or the second fin group 30, is thermally connected to the insulating portion 43 located between the heat receiving portion 41 and the heat dissipating portion 42 of the heat transport member 10, or the heat pipe group 60. Consequently, heat is dissipated from the radiator 3 in the insulating portion 43 by the heat exchange action of the second fin group 30. Consequently, heat is released from the working fluid in the insulating portion 43. As heat is released from the gaseous working fluid in the insulating portion 43, a portion of the gaseous working fluid changes from the gas phase to the liquid phase in the insulating portion 43, not in the heat dissipating portion 42. By causing a portion of the gaseous working fluid flowing through the insulating portion 43 to change to the liquid phase, the return distance of the liquid working fluid to the heat receiving portion 41 is shortened, allowing the liquid working fluid to flow smoothly back to the heat receiving portion 41. Furthermore, a portion of the vapor-phase working fluid changes from the vapor phase to the liquid phase in the heat-insulating portion 43, rather than in the heat-dissipating portion 42, which is more susceptible to freezing than the heat-receiving portion 41 and the heat-insulating portion 43. This prevents freezing of the liquid-phase working fluid. Consequently, the heat transfer characteristics of the heat sink 3 are not impaired, and even when the operating ambient temperature is below the melting point of the working fluid, the heat transfer member 10 can be prevented from drying out.

[0095] Next, other embodiments of the present invention will be described. While the heat sinks of the aforementioned embodiments have first fins disposed upright on both surfaces of the container, it is also possible to have the first fins disposed upright on only one surface of the container. Furthermore, while the heat transfer member of the heat transfer member of the aforementioned embodiments is disposed only on the surface of the heat transfer member container that is not thermally connected to the heating element, the heat transfer member may alternatively be disposed on both surfaces of the heat transfer member container or only on the surface thermally connected to the heating element.

[0096] Furthermore, while the heat sink of the third embodiment has multiple second fins fixed to the plate, a plurality of separate U-shaped second fins may be connected instead. Furthermore, the heat sink of the third embodiment may also be thermally connected to a heat pipe extending from the heat receiving portion to the heat insulating portion as a heat transfer member.

[0097] Industrial application possibilities

[0098] Since the heat sink of the present invention can prevent drying out even when the application environment temperature is lower than the melting point of the working fluid, it is particularly valuable in the field of cooling heating elements such as electronic components placed in low-temperature environments.

[0099] Description of reference numerals:

[0100] 1, 2, 3 Radiators

[0101] 10Heat transport component

[0102] 20 first heat sink group

[0103] 21 First heat sink

[0104] 30 Second heat sink group

[0105] 31 Second heat sink

[0106] 35 heat pipes

[0107] 39 heat transfer components

[0108] 41 heating part

[0109] 42 heat dissipation unit

[0110] 43 Insulation

Claims

1. A radiator, wherein: have: a heat transport member having a heat receiving portion thermally connected to the heat generating body; The first heat sink group is thermally connected to the heat dissipation portion of the heat transport member and includes a plurality of first heat sinks. The heat transport member has a first internal space communicating from the heat receiving portion to the heat dissipating portion and enclosing a first working fluid. A heat transfer member is thermally connected to the heat insulating portion of the heat transport member located between the heat receiving portion and the heat dissipating portion. The heat transfer member is arranged at a predetermined distance from the first fin group.

2. The heat sink according to claim 1, wherein The heat transfer member is a heat exchange member.

3. The heat sink according to claim 2, wherein: The heat exchange member is a second heat sink group configured with a plurality of second heat sinks.

4. The heat sink according to claim 3, wherein: The heat sink area of the second heat sink group is smaller than the heat sink area of the first heat sink group.

5. The heat sink according to claim 1, wherein The heat transfer member is a heat pipe having a second internal space in which a second working fluid is sealed. The heat sink according to claim 5 , wherein: The heat pipe extends from the heat insulating portion to the heat receiving portion.

7. The radiator according to any one of claims 1 to 6, wherein: The internal space of the heat transport member is integrated.

8. The radiator according to any one of claims 1 to 6, wherein: The heat radiating portion of the heat transporting member is wider than the heat receiving portion.

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