WO2022185908A1 - ヒートパイプ - Google Patents
ヒートパイプ Download PDFInfo
- Publication number
- WO2022185908A1 WO2022185908A1 PCT/JP2022/006060 JP2022006060W WO2022185908A1 WO 2022185908 A1 WO2022185908 A1 WO 2022185908A1 JP 2022006060 W JP2022006060 W JP 2022006060W WO 2022185908 A1 WO2022185908 A1 WO 2022185908A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wick
- container
- heat pipe
- cross
- section
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 83
- 238000001704 evaporation Methods 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 13
- 239000007791 liquid phase Substances 0.000 description 34
- 239000012071 phase Substances 0.000 description 15
- 238000009833 condensation Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000010992 reflux Methods 0.000 description 8
- 239000012808 vapor phase Substances 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0233—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the conduits having a particular shape, e.g. non-circular cross-section, annular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/427—Cooling by change of state, e.g. use of heat pipes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
Definitions
- the present invention relates to a heat pipe that has excellent circulation characteristics for working fluid, exhibits excellent heat transport characteristics, and can prevent abnormal noise during circulation of the working fluid.
- Heat pipes are sometimes used as cooling means for electronic components.
- the internal space of the electrical and electronic equipment is becoming narrower and narrower. Therefore, thin heat pipes, which are made by flattening heat pipe containers, are sometimes used.
- Patent Document 1 since a stay, which is a member different from the wick structure, is provided in the internal space of the heat pipe, the mounting amount of the wick structure is reduced and the vapor phase working fluid flows. Steam flow paths are also reduced. Further, in Patent Document 1, the steam flow path is also reduced by extending the wick structure over the entire width direction of the flat container. Therefore, in Patent Literature 1, there is a problem that sufficient flow characteristics of the working fluid cannot be obtained. Moreover, in Patent Document 1, there is a problem that the maximum heat transport amount cannot be sufficiently obtained due to insufficient flow characteristics of the working fluid, and excellent heat transport characteristics cannot be exhibited.
- the liquid-phase working fluid may accumulate in the vapor flow path of the condensing portion of the heat pipe.
- the wick structure is provided only in the central portion in the width direction of the container in order to secure the vapor flow path, the liquid phase may of the working fluid may accumulate.
- the condensing portion of the heat pipe is positioned downward in the direction of gravity, the liquid-phase working fluid tends to accumulate in the vapor passage of the condensing portion of the heat pipe.
- liquid-phase working fluid stored in the vapor flow path of the condensation section flows downward in the direction of gravity and collides with the gas-phase working fluid, causing pressure loss in the flow of the gas-phase working fluid. As a result, there is a problem that excellent heat transport properties cannot be exhibited.
- a container which is a tubular body in which the end surface of one end and the end surface of the other end are sealed, and a wick structure provided inside the container; a working fluid enclosed inside the container;
- a heat pipe comprising In at least one of the cross-sections perpendicular to the longitudinal direction of the container, the wick structure includes a first wick portion, and the wick structure is integral with and extends outwardly from the first wick portion. and a second wick that is thinner than the first wick, The heat pipe, wherein the second wick portion has a flat portion extending along a direction perpendicular to the height direction of the interior space of the container.
- the first wick has a thickness of 50% or more of the height of the interior space of the container, and the second wick has a thickness of less than 50% of the height of the interior space of the container.
- the heat pipe according to [1] or [2], wherein at least a partial region of the container has a flattened portion.
- the flat portion has one inner surface and the other inner surface facing the one inner surface in the height direction of the inner space of the container, and in the one cross section, the first wick portion has a top portion in contact with the one inner surface and a bottom portion in contact with the other inner surface.
- the wick structure is arranged between the top portion of the first wick portion and the flat portion along a direction perpendicular to the height direction of the internal space of the container.
- the heat pipe according to any one of [1] to [4], which has a gradually changing portion in which the thickness of the body continuously decreases.
- the second wick relative to the sum of the width of the second wick and the width from the tip of the second wick to the inner surface of the container facing the tip of the second wick
- the ratio of the cross-sectional area of the internal space of the container not occupied by the wick structure to the cross-sectional area of the wick structure is 15% or more and 65% or less [1] to The heat pipe according to any one of [9].
- the “flat portion” of the second wick portion in the above aspect means that the second wick is flat in the direction orthogonal to the height direction of the internal space of the container (hereinafter sometimes referred to as “the width direction of the internal space of the container”). It means a portion where the rate of change in the thickness of the portion is 5.0% or less of the height of the internal space of the container.
- the “gradually changing portion” of the wick structure in the above aspect means that the change rate of the thickness of the wick structure with respect to the unit length in the width direction of the inner space of the container in the width direction of the inner space of the container is means a portion exceeding 5.0% of the height of the internal space of.
- the wick structure has a first wick portion and a second wick portion that is thinner than the first wick portion, i.e., the second wick portion is relatively thick in the height direction of the interior space of the container.
- the second wick portion which extends outward from the first wick portion and is relatively thin in the height direction of the interior space of the container, extends from the interior space of the container.
- the liquid-phase working fluid flows into the wick structure by the capillary force of the flat portion while sufficiently securing the vapor flow path through which the gas-phase working fluid flows. be absorbed. Therefore, since the second wick portion has the flat portion, it is possible to prevent the liquid-phase working fluid from accumulating at the widthwise end portion of the internal space of the container in the condensing portion of the heat pipe. From the above, according to the aspect of the heat pipe of the present invention, the installation posture of the electric/electronic device equipped with the heat pipe of the present invention has excellent circulation characteristics of the working fluid and exhibits excellent heat transport characteristics. is changed, it is possible to prevent the generation of abnormal noise when the working fluid is circulated.
- the wick structure has a first wick portion having a thickness of 50% or more of the height of the internal space of the container, whereby the liquid-phase working fluid is condensed. It has even better reflux characteristics from the section to the evaporator section. Further, in accordance with the heat pipe aspect of the present invention, less than 50% of the interior space height of the container extends outwardly from the first wick portion having a thickness greater than or equal to 50% of the interior space height of the container.
- the second wick portion having a thickness of has a flat portion extending along the width direction of the internal space of the container, thereby sufficiently securing a vapor flow path through which the vapor-phase working fluid flows,
- the liquid phase working fluid is absorbed into the wick structure by the capillary force of the plateau. Therefore, since the second wick portion having a thickness of less than 50% of the height of the internal space of the container has a flat portion, liquid is It is possible to prevent the phase working fluid from accumulating. From the above, according to the aspect of the heat pipe of the present invention, it is possible to manufacture electrical and electronic equipment equipped with the heat pipe of the present invention while exhibiting further excellent distribution characteristics of the working fluid and exhibiting further excellent heat transport characteristics. Even if the installation posture is changed, it is possible to prevent the generation of abnormal noise when the working fluid is circulated.
- the first wick portion has a top portion in contact with one inner surface of the container and a bottom portion in contact with the other inner surface of the container, thereby forming a condensing portion of the liquid-phase working fluid. Reflux characteristics from to the evaporator are reliably improved.
- the second When the ratio of the width of the wick portion is 50% or more, it is possible to more reliably prevent the liquid-phase working fluid from accumulating at the width direction end portions of the internal space of the container.
- the tip of the second wick is not in contact with the inner surface of the container facing the tip of the second wick, the steam flow path is more reliably secured. , the flow characteristics of the gas-phase working fluid are further improved.
- the working fluid since the ratio of the cross-sectional area of the second wick to the cross-sectional area of the first wick is 1.0% or more and 50% or less, the working fluid has excellent flow characteristics and Abnormal noise prevention during circulation of the working fluid can be improved in a well-balanced manner.
- the thickness of the flat portion of the second wick portion in the evaporating portion is thicker than the thickness of the flat portion in the condensing portion, so that the capillary force of the second wick portion in the evaporating portion is further improved, the reflux characteristic of the liquid-phase working fluid from the condenser section to the evaporator section is further improved.
- the ratio of the cross-sectional area of the internal space of the container not occupied by the wick structure to the cross-sectional area of the wick structure is 10% or more and 50% or less, so that the liquid It is possible to improve the flow characteristics of the phase working fluid and the flow characteristics of the gas phase working fluid in a well-balanced manner.
- FIG. 2 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of the heat pipe according to the first embodiment of the present invention
- FIG. 2 is an explanatory diagram showing an outline of a cross section in a direction perpendicular to the longitudinal direction of the heat pipe according to the first embodiment of the present invention
- FIG. 7 is an explanatory view showing an outline of a cross section in the longitudinal direction of a heat pipe according to a second embodiment of the invention
- FIG. 11 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of a heat pipe according to a third embodiment of the present invention
- It is explanatory drawing which shows the outline
- FIG. 1 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of the heat pipe according to the first embodiment of the present invention.
- FIG. 2 is an explanatory diagram showing an outline of a cross section in a direction perpendicular to the longitudinal direction of the heat pipe according to the first embodiment of the invention.
- the heat pipe 1 is a tubular body in which an end surface 12 of one end portion 11 and an end surface 14 of the other end portion 13 are sealed. It comprises a container 10 , a wick structure 20 provided inside the container 10 , and a working fluid (not shown) sealed inside the container 10 .
- the container 10 has an elongated shape. The shape of the container 10 in the longitudinal direction can be appropriately selected according to the usage conditions and the like, and may be linear or may have a curved portion, but the heat pipe 1 is linear for convenience of explanation. . Further, the inside of the container 10 is a sealed space that has been decompressed.
- the wick structure 20 extends along the longitudinal direction of the container 10 from one end 11 to the other end 13 of the container 10 . Also, the width of the wick structure 20 extends along the longitudinal direction of the container 10 with substantially the same dimension.
- the heat pipe 1 functions as an evaporator by, for example, one end 11 being thermally connected to the heating element 100, and the other end 13 is thermally connected to heat exchange means (not shown). It functions as a condensing part. From the above, the wick structure 20 extends along the heat transport direction of the heat pipe 1 .
- the cross-sectional shape in the direction perpendicular to the longitudinal direction of the container 10 is not particularly limited, but as shown in FIG. 2, the heat pipe 1 has a flattened flat shape. Therefore, the heat pipe 1 is a thin heat pipe having a flat portion.
- the thickness of the container 10 is not particularly limited, it is, for example, 0.1 mm to 0.5 mm.
- the height H of the internal space 15 of the container 10 is not particularly limited, but is, for example, 0.5 mm to 2.0 mm.
- the dimension of the interior space 15 of the container 10 in the direction perpendicular to the direction of the height H (that is, the width direction W of the interior space 15 of the container 10) is not particularly limited, but is, for example, 5 mm to 30 mm.
- the wick structure 20 in a cross section perpendicular to the longitudinal direction of the container 10, includes a first wick portion 21 having a predetermined thickness and a and a thin second wick portion 22 . Therefore, in the cross section, the first wick portion 21 is thicker than the second wick portion 22 .
- the wick structure 20 may have a first wick portion 21 which is a relatively thick portion and a second wick portion 22 which is a relatively thin portion in the above cross section.
- the wick structure 20 is composed of the first wick part 21 having a thickness of 50% or more of the height H of the internal space 15 of the container 10 and the container 10.
- the second wick portion 22 is integral with the first wick portion 21 and extends outwardly from the first wick portion 21 .
- the first wick portion 21 is provided in the central portion in the width direction W of the internal space 15 of the container 10
- the second wick portions 22 are provided continuously on both sides of the first wick portion 21 . It is
- the second wick portions 22 are provided near both ends in the width direction W of the internal space 15 of the container 10 .
- the flat portion of the container 10 has one inner surface 16 and the other inner surface 17 facing the one inner surface 16 in the height H direction of the internal space 15 of the container 10 .
- the first wick portion 21 has a top portion 23 in contact with one inner surface 16 and a bottom portion 24 in contact with the other inner surface 17 . Therefore, in the heat pipe 1, the first wick portion 21 has a thickness corresponding to the height H of the internal space 15 of the container 10, that is, a thickness of 100% of the height H of the internal space 15 of the container 10. It has a part with From the above, the thickness of the portion corresponding to the top portion 23 of the first wick portion 21 maintains the thickness corresponding to the height H of the internal space 15 . In the heat pipe 1 , the top portion 23 of the first wick portion 21 is in surface contact with one inner surface 16 , and the bottom portion 24 of the first wick portion 21 is in surface contact with the other inner surface 17 .
- the second wick part 22 is provided in contact with the other inner surface 17 and is not in contact with the one inner surface 16 and the inner surface 18 connecting the one inner surface 16 and the other inner surface 17 . Therefore, the second wick portion 22 is not provided on one of the inner surfaces 16 and 18 . A portion of the inner surface 16 that is not in contact with the first wick portion 21 and the inner surface 18 are both exposed to the internal space 15 .
- the second wick portion 22 has a flat portion 30 extending along the width direction W of the internal space 15 of the container 10 .
- the flat portions 30 are formed at both ends of the second wick portion 22 in the width direction W of the internal space 15 .
- the flat portion 30 extends a predetermined length from the first wick portion 21 toward the inner surface 18 while maintaining a predetermined thickness that is less than 50% of the height H of the interior space 15. .
- the flat portion 30 maintains a predetermined thickness that is less than 50% of the height H of the internal space 15, the liquid phase can be From the point of reliably preventing the working fluid from being accumulated, it is preferable to maintain a predetermined thickness that is less than 30% of the height H of the internal space 15, and less than 20% of the height H of the internal space 15 It is particularly preferred to maintain a predetermined thickness of .
- the flat portion 30 is 10% or more of the height H of the internal space 15 in order to further reliably prevent the liquid-phase working fluid from accumulating at the width direction W end portion of the internal space 15 of the container 10. is preferably maintained at a predetermined thickness of . Since the flat portion 30 extends from the first wick portion 21 toward the inner side surface 18 while maintaining a predetermined thickness, the flat portion 30 has a substantially flat shape.
- the width W1 of the second wick portion 22 and the inner surface of the container 10 (in FIG. 2, The ratio of the width W1 of the second wick portion 22 to the total width W2 to the inner surface 18) of the container 10 is not particularly limited, but in the heat pipe 1, it is 50% or more.
- the tip 31 of the second wick portion 22 is not in contact with the inner side surface 18 of the container 10 . Therefore, the ratio of the width W1 of the second wick portion 22 to the total dimension of the width W1 of the second wick portion 22 and the width W2 from the tip 31 of the second wick portion 22 to the inner surface 18 facing the tip 31 is 100. %.
- the second wick portion 22 including the flat portion 30 extends to the inner side surface 18 of the container 10 .
- the tip 31 of the second wick portion 22 faces the inner side surface 18 with a predetermined gap therebetween. Therefore, the other inner surface 17 has a portion that is in contact with neither the first wick portion 21 nor the second wick portion 22 , and this portion is exposed to the internal space 15 .
- the thickness of the flat portion 30 may extend with substantially the same thickness along the longitudinal direction of the container 10, or may have different thicknesses depending on the portion of the container 10 in the longitudinal direction.
- the thickness of the flat portion 30 in the evaporating portion where the container 10 is thermally connected to the heating element 100 is the same as that of the container 10.
- the capillary force of the second wick portion 22 in the evaporator portion is further improved, and the liquid phase operation This is preferable in that the reflux characteristic of the fluid from the condensing section to the evaporating section is further improved.
- the wick structure 20 is arranged between the top portion 23 of the first wick portion 21 and the flat portion 30 along the width direction W of the internal space 15 of the container 10 . It has a gradual change portion 40 in which the intensity decreases continuously.
- the gradually changing portion 40 is formed across the first wick portion 21 and the second wick portion 22 , and the thickness of the wick structure 20 increases from the first wick portion 21 toward the second wick portion 22 . is decreasing.
- the change rate of the thickness of the wick structure 20 at the gradually changing portion 40 is greater than the change rate of the thickness of the wick structure 20 at the flat portion 30 .
- the ratio of the cross-sectional area of the second wick portion 22 to the cross-sectional area of the first wick portion 21 is not particularly limited. 1.0% or more and 50% or less is preferable, and 10% or more and 30% or less is particularly preferable, from the point of reliably preventing accumulation of the liquid-phase working fluid while ensuring that.
- the internal space 15 that is not occupied by the wick structure 20 is a vapor channel 50 through which the vapor-phase working fluid flows.
- the vapor flow path 50 extends along the heat transport direction of the heat pipe 1 .
- the ratio of the cross-sectional area of the internal space 15 (steam flow path 50) of the container 10 not occupied by the wick structure 20 to the cross-sectional area of the wick structure 20 is not particularly limited, but the heat pipe 1 15% or more and 65% or less are preferable, and 20% or more and 60% or less are particularly preferable, from the viewpoint that the flow characteristics of the liquid-phase working fluid and the flow characteristics of the gas-phase working fluid can be improved in a well-balanced manner. More specifically, in the heat pipe 1, the ratio of the cross-sectional area of the internal space 15 of the container 10 not occupied by the wick structure 20 to the cross-sectional area of the wick structure 20 is 30% or more and 50% or less. ing.
- the material of the container 10 is not particularly limited, and examples thereof include metals such as copper and copper alloys from the viewpoint of excellent thermal conductivity, aluminum and aluminum alloys from the viewpoint of lightness, and stainless steel from the viewpoint of improvement in mechanical strength. be able to. Further, tin, tin alloys, titanium, titanium alloys, nickel, nickel alloys, and the like may be used depending on the usage conditions of the heat pipe 1 .
- a powder sintered body containing metal powder can be mentioned.
- a sintered body of metal powder such as copper powder and stainless steel powder
- a sintered body of mixed powder of copper powder and carbon powder may be mentioned.
- the first wick portion 21 and the second wick portion 22 may be made of powder of the same material type, or may be made of different material types.
- the average particle size of the powder in the first wick portion 21 and the second wick portion 22 may be the same or different.
- the average primary particle size of the powder containing metal powder, which is the raw material of the sintered body can be appropriately selected depending on the capillary force required for the wick structure 20 and the reflux characteristics of the liquid-phase working fluid. 50 ⁇ m or more and 100 ⁇ m or less can be mentioned.
- the working fluid enclosed in the container 10 can be appropriately selected according to the material of the container 10, and examples thereof include water, CFC substitutes, perfluorocarbons, and cyclopentane.
- the method for manufacturing the heat pipe of the present invention is not particularly limited. It can be manufactured by using a core rod provided with a notch portion of a predetermined shape. Specifically, for example, a core rod having the above shape is inserted from one end to the other end in the longitudinal direction of a circular tubular member. A gap based on the notch is formed between the inner wall surface of the tube and the outer surface of the core rod. A predetermined amount of powder, which is the raw material of the wick structure 20, is filled into the void from the end of the tube. The tubular material filled with the powder is heat-treated, the core rod is pulled out from the tubular material, and the tubular material is flattened. When the tube material is flattened, the wick structure 20 is formed from the powder filled in the notch.
- the heat transport mechanism of the heat pipe 1 for example, by thermally connecting the heating element 100 to one end portion 11, one end portion 11 functions as an evaporating portion (heat receiving portion), and the other end portion 13 is provided with heat exchanging means. are thermally connected to each other, the other end 13 functions as a condensing section (radiating section).
- a central portion 19 positioned between one end portion 11 and the other end portion 13 functions as a heat insulating portion.
- the working fluid that has undergone a phase change to the vapor phase flows through the vapor passage 50 in the longitudinal direction of the container 10 from the evaporator to the condenser (in the heat pipe 1, from one end 11 to the other end 13). , heat from the heating element 100 is transported from the evaporator to the condenser. The heat from the heating element 100 transported from the evaporating section to the condensing section is released as latent heat by the phase change of the vapor-phase working fluid to the liquid phase in the condensing section provided with the heat exchange means. The latent heat released in the condensation section is released from the condensation section to the external environment of the heat pipe 1 by the heat exchange means provided in the condensation section. The working fluid that has undergone a phase change to a liquid phase in the condensing section is returned from the condensing section to the adiabatic section by the capillary force of the wick structure 20 .
- the wick structure 20 has the first wick part 21 having a thickness of 50% or more of the height H of the internal space 15 of the container 10, It has excellent reflux characteristics for the liquid-phase working fluid from the condensing section to the evaporating section. Further, a second wick portion 22 extending outwardly from the first wick portion 21 and having a thickness of less than 50% of the height H of the interior space 15 of the container 10 extends in the width direction W of the interior space 15 of the container 10. By having the flat portion 30 extending along the width direction W The liquid-phase working fluid stored at the end is absorbed by the wick structure 20 .
- the second wick portion 22 has the flat portion 30, it is possible to prevent the liquid-phase working fluid from accumulating in the width direction W end portion of the internal space 15 of the container 10 in the condensing portion of the heat pipe 1. can. From the above, the heat pipe 1 has excellent flow characteristics of the working fluid, exhibits excellent heat transport characteristics, and even if the installation posture of the electric/electronic device in which the heat pipe 1 is mounted is changed, the working fluid It is possible to prevent the occurrence of abnormal noise during distribution.
- the second wick part 22 has the flat part 30 extending along the width direction W of the internal space 15 of the container 10, the working fluid evaporation area in the evaporation part is increased and the thermal resistance is reduced. can be made Further, in the heat pipe 1, since the liquid-phase working fluid can be prevented from accumulating in the condensing portion of the heat pipe 1, heat can be reliably transported from one end 11 to the other end 13 of the container 10. can contribute.
- the heat pipe 1 a portion of the inner surface 16 that is not in contact with the first wick portion 21 and the inner surface 18 are exposed to the internal space 15 without forming a wick structure.
- the flow path 50 is sufficiently secured, and the gas-phase working fluid can flow smoothly.
- the first wick portion 21 has a top portion 23 in contact with one inner surface 16 of the container 10 and a bottom portion 24 in contact with the other inner surface 17 of the container 10. Since there is provided a portion having a thickness of 100% with respect to the height H of the internal space 15, the liquid-phase working fluid is excellent in reflux characteristics from the condensing portion to the evaporating portion.
- the ratio of the width W1 of the second wick portion 22 to the sum of the width W1 of the second wick portion 22 and the width W2 from the tip 31 of the second wick portion 22 to the inner side surface 18 facing the tip 31. is 50% or more, it is possible to more reliably prevent the liquid-phase working fluid from accumulating at the widthwise end W of the internal space 15 of the container 10 .
- the tip 31 of the second wick portion 22 is not in contact with the inner side surface 18 of the container facing the tip 31 of the second wick portion 22, so the vapor flow path 50 is more reliably secured, and the vapor phase is working fluid distribution characteristics are further improved.
- the ratio of the cross-sectional area of the second wick portion 22 to the cross-sectional area of the first wick portion 21 is 1.0% or more and 50% or less. Abnormal noise prevention is improved in a well-balanced manner.
- FIG. 3 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of the heat pipe according to the second embodiment of the invention.
- the shape of the container 10 in the longitudinal direction is linear, but instead of this, as shown in FIG. , the shape of the container 10 in the longitudinal direction is a shape having a curved portion 51 .
- the container 10 is L-shaped with one curved portion 51 .
- the heat pipe 2 in which the container 10 is L-shaped it is possible to prevent the liquid-phase working fluid from accumulating at the widthwise end of the internal space 15 of the container 10 in the condensing portion of the heat pipe 2 . From the above, the heat pipe 2 also has excellent flow characteristics of the working fluid, and exhibits excellent heat transport characteristics. It is possible to prevent the occurrence of abnormal noise during distribution.
- FIG. 4 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of a heat pipe according to a third embodiment of the invention.
- the shape of the container 10 in the longitudinal direction is linear, but instead of this, as shown in FIG. , the shape of the container 10 in the longitudinal direction is a shape having a plurality of curved portions 51 (two in the case of the heat pipe 3).
- the liquid-phase working fluid is accumulated in the width direction end portion of the internal space 15 of the container 10 among the condensing portions of the heat pipe 3. can be prevented.
- the heat pipe 3 also has excellent flow characteristics of the working fluid, and exhibits excellent heat transport characteristics. It is possible to prevent the occurrence of abnormal noise during distribution.
- FIG. 5 is an explanatory diagram showing an outline of a cross section in the longitudinal direction of the heat pipe according to the fourth embodiment of the invention.
- the shape in the longitudinal direction of the container 10 is linear, but instead of this, as shown in FIG. , the shape of the container 10 in the longitudinal direction is a shape having a plurality of curved portions 51 (four in the case of the heat pipe 4).
- the heating element 100 is thermally connected to one end 11 of the container 10, but instead of this, as shown in FIG.
- the heating element 100 is thermally connected to the central portion 19 of the container 10, and the central portion 19 of the container 10 functions as an evaporating portion (heat receiving portion).
- the one end 11 and the other end 13 of the container 10 function as condensation sections (radiation sections).
- the condensing portion of the heat pipe 4 has a portion of the container 10 . It is possible to prevent the liquid-phase working fluid from accumulating at the width direction end portions of the internal space 15 . From the above, the heat pipe 4 also has excellent circulation characteristics of the working fluid, and exhibits excellent heat transport characteristics, and even if the installation posture of the electric / electronic device equipped with the heat pipe 4 is changed, the working fluid It is possible to prevent the occurrence of abnormal noise during distribution.
- the wick structure 20 has a thickness of 50% or more of the height H of the internal space 15 of the container 10 in a cross section perpendicular to the longitudinal direction of the container 10.
- 1 wick portion 21 and a second wick portion 22 having a thickness of less than 50% of the height H of the interior space 15 of the container 10, but in the above cross section, the first wick portion 21 is the second wick portion. 22 (the second wick portion 22 is thinner than the first wick portion 21), the thickness of the first wick portion 21 and the second wick portion 22 with respect to the height H of the internal space 15 is It is not particularly limited.
- the width of the second wick portion 22 with respect to the sum of the width W1 of the second wick portion 22 and the width W2 from the tip 31 of the second wick portion 22 to the inner surface 18 facing the tip 31 is
- the ratio of the width W1 of the portion 22 is 50% or more and less than 100%, it may be, for example, 30% or more and less than 50%.
- the top portion 23 of the first wick portion 21 is in contact with one inner surface 16.
- the first wick portion 21 may The top portion 23 may be configured so as not to contact the inner surface of the container 10 . That is, the first wick portion 21 may have a thickness of 50% or more of the height H of the internal space 15 of the container 10, and less than 100% of the height H of the internal space 15 of the container 10. thickness.
- the heat pipe of the present invention has excellent circulation characteristics of the working fluid, exhibits excellent heat transport characteristics, and can prevent the generation of abnormal noise during the circulation of the working fluid. It has a high utility value in the field of cooling electronic parts such as semiconductor elements installed in electrical and electronic equipment.
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Abstract
Description
[1]一方の端部の端面と他方の端部の端面とが封止された、管体であるコンテナと、前記コンテナの内部に設けられたウィック構造体と、
前記コンテナの内部に封入された作動流体と、
を備えたヒートパイプであって、
前記コンテナの長手方向に対して直交方向の断面の少なくとも一断面において、前記ウィック構造体が、第1ウィック部と、前記第1ウィック部と一体であり、前記第1ウィック部から外方向へ伸びる、前記第1ウィック部よりも薄い第2ウィック部と、を有し、
前記第2ウィック部が、前記コンテナの内部空間の高さ方向に直交する方向に沿って延在する平坦部を有するヒートパイプ。
[2]前記第1ウィック部が、前記コンテナの内部空間の高さの50%以上の厚さを有し、前記第2ウィック部が、前記コンテナの内部空間の高さの50%未満の厚さを有する[1]に記載のヒートパイプ。
[3]前記コンテナの少なくとも一部領域が、扁平加工された扁平部を有する[1]または[2]に記載のヒートパイプ。
[4]前記扁平部が、前記コンテナの内部空間の高さ方向に、一方の内面と、前記一方の内面と対向した他方の内面と、を有し、前記一断面において、前記第1ウィック部が、前記一方の内面と接した頂部と前記他方の内面に接した底辺部を有する[3]に記載のヒートパイプ。
[5]前記一断面において、前記ウィック構造体が、前記第1ウィック部の頂部と前記平坦部との間に、前記コンテナの内部空間の高さ方向に直交する方向に沿って、前記ウィック構造体の厚さが連続的に減少していく徐変部を有する[1]乃至[4]のいずれか1つに記載のヒートパイプ。
[6]前記一断面において、前記第2ウィック部の幅と前記第2ウィック部の先端から前記第2ウィック部の先端に対向する前記コンテナの内面までの幅との合計に対する、前記第2ウィック部の幅の割合が、50%以上である[1]乃至[5]のいずれか1つに記載のヒートパイプ。
[7]前記第2ウィック部の先端が、前記第2ウィック部の先端に対向する前記コンテナの内面と接していない[1]乃至[6]のいずれか1つに記載のヒートパイプ。
[8]前記一断面において、前記第1ウィック部の断面積に対する前記第2ウィック部の断面積の割合が、1.0%以上50%以下である[1]乃至[7]のいずれか1つに記載のヒートパイプ。
[9]前記コンテナが、発熱体と熱的に接続される蒸発部と、熱交換手段と熱的に接続される凝縮部とを有し、前記蒸発部における前記平坦部の厚さが、前記凝縮部における前記平坦部の厚さよりも厚い[1]乃至[8]のいずれか1つに記載のヒートパイプ。
[10]前記一断面において、前記ウィック構造体の断面積に対する、前記ウィック構造体で占められていない前記コンテナの内部空間の断面積の割合が、15%以上65%以下である[1]乃至[9]のいずれか1つに記載のヒートパイプ。
[11]前記ウィック構造体が、金属粉の焼結体である[1]乃至[10]のいずれか1つに記載のヒートパイプ。
10 コンテナ
11 一方の端部
13 他方の端部
20 ウィック構造体
21 第1のウィック部
22 第2のウィック部
30 平坦部
40 徐変部
Claims (11)
- 一方の端部の端面と他方の端部の端面とが封止された、管体であるコンテナと、
前記コンテナの内部に設けられたウィック構造体と、
前記コンテナの内部に封入された作動流体と、
を備えたヒートパイプであって、
前記コンテナの長手方向に対して直交方向の断面の少なくとも一断面において、前記ウィック構造体が、第1ウィック部と、前記第1ウィック部と一体であり、前記第1ウィック部から外方向へ伸びる、前記第1ウィック部よりも薄い第2ウィック部と、を有し、
前記第2ウィック部が、前記コンテナの内部空間の高さ方向に直交する方向に沿って延在する平坦部を有するヒートパイプ。 - 前記第1ウィック部が、前記コンテナの内部空間の高さの50%以上の厚さを有し、前記第2ウィック部が、前記コンテナの内部空間の高さの50%未満の厚さを有する請求項1に記載のヒートパイプ。
- 前記コンテナの少なくとも一部領域が、扁平加工された扁平部を有する請求項1または2に記載のヒートパイプ。
- 前記扁平部が、前記コンテナの内部空間の高さ方向に、一方の内面と、前記一方の内面と対向した他方の内面と、を有し、前記一断面において、前記第1ウィック部が、前記一方の内面と接した頂部と前記他方の内面に接した底辺部を有する請求項3に記載のヒートパイプ。
- 前記一断面において、前記ウィック構造体が、前記第1ウィック部の頂部と前記平坦部との間に、前記コンテナの内部空間の高さ方向に直交する方向に沿って、前記ウィック構造体の厚さが連続的に減少していく徐変部を有する請求項1乃至4のいずれか1項に記載のヒートパイプ。
- 前記一断面において、前記第2ウィック部の幅と前記第2ウィック部の先端から前記第2ウィック部の先端に対向する前記コンテナの内面までの幅との合計に対する、前記第2ウィック部の幅の割合が、50%以上である請求項1乃至5のいずれか1項に記載のヒートパイプ。
- 前記第2ウィック部の先端が、前記第2ウィック部の先端に対向する前記コンテナの内面と接していない請求項1乃至6のいずれか1項に記載のヒートパイプ。
- 前記一断面において、前記第1ウィック部の断面積に対する前記第2ウィック部の断面積の割合が、1.0%以上50%以下である請求項1乃至7のいずれか1項に記載のヒートパイプ。
- 前記コンテナが、発熱体と熱的に接続される蒸発部と、熱交換手段と熱的に接続される凝縮部とを有し、前記蒸発部における前記平坦部の厚さが、前記凝縮部における前記平坦部の厚さよりも厚い請求項1乃至8のいずれか1項に記載のヒートパイプ。
- 前記一断面において、前記ウィック構造体の断面積に対する、前記ウィック構造体で占められていない前記コンテナの内部空間の断面積の割合が、15%以上65%以下である請求項1乃至9のいずれか1項に記載のヒートパイプ。
- 前記ウィック構造体が、金属粉の焼結体である請求項1乃至10のいずれか1項に記載のヒートパイプ。
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US18/361,602 US20230375278A1 (en) | 2021-03-05 | 2023-07-28 | Heat pipe |
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US20100181048A1 (en) * | 2009-01-16 | 2010-07-22 | Furui Precise Component (Kunshan) Co., Ltd. | Heat pipe |
JP2011043320A (ja) * | 2009-07-21 | 2011-03-03 | Furukawa Electric Co Ltd:The | 扁平型ヒートパイプおよびその製造方法 |
US20120279687A1 (en) * | 2011-05-05 | 2012-11-08 | Celsia Technologies Taiwan, I | Flat-type heat pipe and wick structure thereof |
US20150101784A1 (en) * | 2013-10-15 | 2015-04-16 | Hao Pai | Heat pipe with ultra-thin flat wick structure |
WO2018190375A1 (ja) * | 2017-04-12 | 2018-10-18 | 古河電気工業株式会社 | ヒートパイプ |
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US20090071633A1 (en) * | 2007-09-13 | 2009-03-19 | Forcecon Technology Co., Ltd. | Heat pipe structure |
JP3175383U (ja) * | 2012-02-20 | 2012-05-10 | 奇▲こう▼科技股▲ふん▼有限公司 | 熱管放熱構造 |
TWI547327B (zh) * | 2013-02-05 | 2016-09-01 | An ultra - thin heat pipe and its manufacturing method |
-
2022
- 2022-02-16 CN CN202290000184.XU patent/CN219776443U/zh active Active
- 2022-02-16 WO PCT/JP2022/006060 patent/WO2022185908A1/ja active Application Filing
- 2022-02-16 JP JP2022536725A patent/JPWO2022185908A1/ja active Pending
- 2022-02-23 TW TW111106507A patent/TWI824419B/zh active
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100181048A1 (en) * | 2009-01-16 | 2010-07-22 | Furui Precise Component (Kunshan) Co., Ltd. | Heat pipe |
JP2011043320A (ja) * | 2009-07-21 | 2011-03-03 | Furukawa Electric Co Ltd:The | 扁平型ヒートパイプおよびその製造方法 |
US20120279687A1 (en) * | 2011-05-05 | 2012-11-08 | Celsia Technologies Taiwan, I | Flat-type heat pipe and wick structure thereof |
US20150101784A1 (en) * | 2013-10-15 | 2015-04-16 | Hao Pai | Heat pipe with ultra-thin flat wick structure |
WO2018190375A1 (ja) * | 2017-04-12 | 2018-10-18 | 古河電気工業株式会社 | ヒートパイプ |
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TW202300850A (zh) | 2023-01-01 |
US20230375278A1 (en) | 2023-11-23 |
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