WO2022025261A1 - Élément de conduction thermique - Google Patents

Élément de conduction thermique Download PDF

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Publication number
WO2022025261A1
WO2022025261A1 PCT/JP2021/028356 JP2021028356W WO2022025261A1 WO 2022025261 A1 WO2022025261 A1 WO 2022025261A1 JP 2021028356 W JP2021028356 W JP 2021028356W WO 2022025261 A1 WO2022025261 A1 WO 2022025261A1
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WO
WIPO (PCT)
Prior art keywords
wick structure
conductive member
heat conductive
metal plate
member according
Prior art date
Application number
PCT/JP2021/028356
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English (en)
Japanese (ja)
Inventor
征志 高尾
仕▲ゆ▼ 楊
敏彦 小関
雅昭 花野
淳一 石田
和宏 西川
Original Assignee
日本電産株式会社
尼得科超▲しゅう▼科技股▲ふん▼有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2021088007A external-priority patent/JP2023123892A/ja
Application filed by 日本電産株式会社, 尼得科超▲しゅう▼科技股▲ふん▼有限公司 filed Critical 日本電産株式会社
Publication of WO2022025261A1 publication Critical patent/WO2022025261A1/fr

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    • 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
    • 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

Definitions

  • the present disclosure relates to heat conductive members.
  • a conventional flat plate heat pipe has a flat plate-shaped airtight container provided with a bottom wall portion, an upper wall portion, and a support column connecting the bottom wall portion and the upper wall portion.
  • a working fluid is sealed inside the flat plate-shaped closed container, and a porous sintered sheet penetrating the support column is arranged in close contact with the inner surface of the bottom wall portion and the inner surface of the upper wall portion. .. It was
  • the flat plate-shaped closed container is arranged in contact with the heating element.
  • the working fluid is heated by the heating element and vaporized from the porous sintered sheet.
  • the vaporized working fluid moves inside the flat plate-shaped closed container toward the upper wall.
  • the working fluid is cooled and condensed by heat dissipation.
  • the working fluid of the liquid moves toward the heating element side in the porous sintered sheet by the capillary phenomenon. As a result, heat is transferred from the bottom wall side to the upper wall side (see, for example, Patent Document 1).
  • the flat plate-shaped closed container as described above has a problem that the vaporized working fluid is difficult to move from the porous sintered sheet on the bottom plate portion side, and the heat transport efficiency is low. It was
  • An exemplary thermal conductive member of the present disclosure comprises a housing having an internal space, a first wick structure, a second wick structure, and an actuating medium.
  • the housing has a first metal plate, a second metal plate arranged so as to face the first metal plate, and a pillar portion arranged in an internal space.
  • the working medium, the first wick structure, and the second wick structure are arranged in the internal space.
  • the first wick structure is arranged on the first metal plate side.
  • the second wick structure is arranged on the second metal plate side.
  • the second wick structure has a plurality of openings extending in the thickness direction as well as opening on the facing surface facing the first wick structure.
  • FIG. 1 is a perspective view of the heat conductive member according to the present disclosure.
  • FIG. 2 is a schematic cross-sectional view of the heat conductive member.
  • FIG. 3 is a schematic perspective view showing the inside of the internal space of the housing of the heat conductive member.
  • FIG. 4 is a perspective view of the second wick structure.
  • FIG. 5 is an enlarged cross-sectional view of the second wick structure shown in FIG. 4 cut along a plane parallel to the YZ plane and enlarged.
  • FIG. 6 is an enlarged cross-sectional view of the second wick structure of the first modification.
  • FIG. 7 is an enlarged cross-sectional view of the second wick structure of the second modification.
  • FIG. 8 is a plan view of the second wick structure of the third modification.
  • FIG. 1 is a perspective view of the heat conductive member according to the present disclosure.
  • FIG. 2 is a schematic cross-sectional view of the heat conductive member.
  • FIG. 3 is a schematic perspective view showing the
  • FIG. 9 is a plan view of the second wick structure of the fourth modification.
  • FIG. 10 is a plan view of the second wick structure of the fifth modification.
  • FIG. 11 is a plan view of another example of the second wick structure.
  • FIG. 12 is a plan view of still another example of the second wick structure.
  • the heat conductive member 100 has a rectangular shape in a plan view, and the first metal plate 11 and the second metal plate 12 overlap each other in the direction of gravity.
  • a three-dimensional Cartesian coordinate system that is, an XYZ coordinate system is used as appropriate.
  • the Z direction indicates the vertical direction (that is, the direction of gravity). It was
  • the lateral direction of the heat conductive member 100 is the X direction
  • the longitudinal direction is the Y direction. That is, the X direction points to the short side direction of the heat conductive member 100 and is a direction orthogonal to the Z direction.
  • the Y direction refers to the longitudinal direction of the heat conductive member 100, and is a direction orthogonal to the Z direction.
  • this is for convenience of explanation only, and does not limit the orientation of the heat conductive member 100 according to the present disclosure at the time of manufacture and use.
  • parallel is used in the present specification, it does not mean only the case where it is mathematically strictly parallel, but also includes the case where it is parallel to the extent that the effect in the present disclosure is obtained. It was
  • sining refers to a technique of heating a metal powder or a paste containing a metal powder to a temperature lower than the melting point of the metal to bake and harden the metal particles.
  • sintered body refers to an object obtained by sintering. It was
  • FIG. 1 is a perspective view of a heat conductive member 100 according to an exemplary embodiment of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view of the heat conductive member 100.
  • FIG. 3 is a schematic perspective view showing the inside of the internal space 103 of the housing 10 of the heat conductive member 100.
  • the heat conductive member 100 has a heated region 101 and a heat radiating region 102 (see FIG. 2).
  • the heated region 101 is arranged in contact with the heating element Ht, for example, and is heated by the heat generated by the heating element Ht. Further, the heated region 101 is provided with an overlapping region 105 that overlaps with the heating element Ht in the Z direction.
  • the overlapping region 105 has a large amount of heat transferred from the heating element Ht.
  • the heat radiating region 102 releases the heat of the working medium 20, which will be described later, heated in the heated region 101 to the outside. That is, the heat conductive member 100 transports heat from the heating element Ht and dissipates heat to the outside, thereby suppressing an increase in the temperature of the heating element Ht. It was
  • the heat conductive member 100 has a housing 10, an actuating medium 20, a first wick structure 31, and a second wick structure 32. Further, the heat conductive member 100 further has a porous column portion 132. It was
  • the housing 10 has an internal space 103.
  • the working medium 20, the first wick structure 31, and the second wick structure 32 are housed in the internal space 103. Further, the porous pillar portion 132 is arranged in the internal space 103.
  • the thickness of the heat conductive member 100 in the Z direction is, for example, 5 mm or more.
  • the heated region 101 is formed by a part of the housing 10.
  • the heat dissipation region 102 is formed by another part of the housing 10. It was
  • the heat conductive member 100 water is used as the working medium 20, but the heat conductive member 100 is not limited to this.
  • alcohol compounds, CFC substitutes, hydrocarbon compounds, fluorinated hydrocarbon compounds, glycol compounds and the like can be mentioned.
  • the working medium 20 a substance that evaporates (vaporizes) with heat from the heating element Ht in the heated region 101 and is condensed (liquefied) by transferring heat to the housing 10 in the heat radiating region 102 is widely adopted. Can be done. It was
  • FIG. 2 the flow of steam generated by vaporizing the working medium 20 is indicated by a black arrow in the heat conductive member 100, and the flow of the liquid working medium 20 is indicated by a white arrow in the heat conductive member 100.
  • the heated region 101 is heated by the heat generated by the heating element Ht.
  • the liquid working medium 20 contained in the second wick structure 32 is vaporized.
  • the vaporized working medium 20 moves the internal space 103 toward the heat dissipation region 102. At this time, the vaporized working medium 20 moves to the first wick structure 31 side, is cooled, and condenses. It was
  • a part of the working medium 20 of the liquid condensed in the first wick structure 31 is dropped and absorbed by the second wick structure 32. Further, a part of the liquid working medium 20 in the first wick structure 31 moves in the first wick structure 31 and in the porous column portion 132 and is absorbed by the second wick structure 32. Further, a part of the liquid working medium 20 in the first wick structure 31 moves along the outer surface of the solid pillar portion 131 described later and is absorbed by the second wick structure 32. It was
  • the liquid working medium 20 moves in the second wick structure 32 toward the heated region 101 due to the capillary phenomenon. In this way, the working medium 20 moves inside the internal space 103 while changing its state, and heat is continuously transferred from the heated region 101 side to the heat radiating region 102 side. Then, by releasing heat from the heat radiating region 102 to the outside of the heat conductive member 100, the heat of the heating element Ht is released to the outside, and the temperature rise of the heating element Ht is suppressed. It was
  • heat exchange means such as heat dissipation fins and heat sinks may be thermally connected and arranged in the heat dissipation region 102.
  • the cooling medium may flow through the heat exchange means.
  • the cooling medium may be, for example, water, oil, or air. It was
  • the heating element Ht for example, a power transistor can be mentioned.
  • the power transistor is included in the inverter that controls the current supplied to the traction motor for driving the wheels of the vehicle.
  • Examples of the power transistor include an IGBT (Insulated Gate Bipolar Transistor).
  • the heat conductive member 100 is mounted on the traction motor.
  • the calorific value of the IGBT is generally 100 W or more. It was
  • the inverter may include elements that generate heat during operation, such as a transformer and a choke. It is also possible to use the heat conductive member 100 with such an element as a heating element. It was
  • the housing 10 has a first metal plate 11 and a second metal plate 12 arranged to face the first metal plate 11. Further, the housing 10 further has a pillar portion 13.
  • the first metal plate 11 and the second metal plate 12 are plate materials formed of, for example, a metal having high thermal conductivity such as copper or an alloy thereof. Further, it may be formed by plating the surface of a metal other than copper with copper.
  • Metals other than copper include, for example, any metal such as iron, aluminum, zinc, silver, gold, magnesium, manganese, and titanium, or alloys containing at least one of the above metals (brass, geralmin, stainless steel). Steel, etc.), but is not limited to this.
  • a metal having a higher elastic modulus (for example, Young's modulus) than copper can be widely adopted.
  • the first metal plate 11 and the second metal plate 12 are rectangular plate materials in the longitudinal direction in the Y direction when viewed from the Z direction.
  • the first metal plate 11 and the second metal plate 12 face each other in the Z direction.
  • the first metal plate 11 covers the upper surface of the second metal plate 12.
  • the first metal plate 11 and the second metal plate 12 of the present embodiment have a rectangular shape, but are not limited to this shape, and may be, for example, a polygon, a circle, an ellipse, or the like in a plan view. .. It was
  • the heating element Ht is arranged on the outer surface of the second metal plate 12. That is, the heating element Ht is arranged on the lower surface side of the second metal plate 12.
  • the heating element Ht may be in direct contact with the second metal plate 12, or may be arranged via a heat transfer element such as heat transfer grease. The heat from the heating element Ht is transferred to the second metal plate 12.
  • the first metal plate 11 has a first side wall portion 111 extending downward from the peripheral edge.
  • the second metal plate 12 has a second side wall portion 121 extending upward from the peripheral edge.
  • the lower surface of the first side wall portion 111 and the upper surface of the second side wall portion 121 are joined at the joint portion 14.
  • the lower surface of the first side wall portion 111 and the upper surface of the second metal plate 12 may be joined by omitting the second side wall portion 121.
  • the upper surface of the second side wall portion 121 and the lower surface of the first metal plate 11 may be joined by omitting the first side wall portion 111. It was
  • the joining method between the first side wall portion 111 and the second side wall portion 121 is not particularly limited, and for example, a joining method such as joining by applying heat and pressure, diffusion joining, or joining using a brazing material is adopted. can do. In addition to these, a joining method that can suppress leakage of the liquid and gas working medium 20 and can be sealed can be widely adopted. It was
  • the internal space 103 is formed by joining the first metal plate 11 and the second metal plate 12 at the joint portion 14. When viewed from the Z direction, the joint portion 14 is located around the internal space 103.
  • the internal space 103 is a closed space surrounded by the first metal plate 11 and the second metal plate 12, and is maintained in a reduced pressure state where the atmospheric pressure is lower than the atmospheric pressure, for example.
  • the internal space 103 is in a reduced pressure state, the boiling point of the working medium 20 housed in the internal space 103 drops, and the working medium 20 easily evaporates. The details of heat transfer due to the state change of the working medium 20 will be described later. It was
  • the joint portion 14 may include a sealing portion.
  • the sealing portion is, for example, a portion where an injection port for injecting the working medium 20 into the housing 10 is sealed by welding in the manufacturing process of the heat conductive member 100. It was
  • the pillar portion 13 is arranged in the internal space 103.
  • the pillar portion 13 has at least one solid solid pillar portion 131. Further, the pillar portion 13 has at least one porous pillar portion 132.
  • the solid pillar portion 131 is a solid member extending in the Z direction.
  • a "solid” member means a member composed of a so-called solid object, and refers to a member composed of an object that is tightly packed and is not porous.
  • the solid pillar portion 131 is columnar.
  • the shape of the solid pillar portion 131 is not limited to this, and the cross section cut along the plane parallel to the XY plane may be a polygon, an ellipse, or the like.
  • the solid pillar portions 131 are arranged two-dimensionally and regularly side by side in the XY plane, for example. It was
  • the solid pillar portion 131 is a separate member from the first metal plate 11 and the second metal plate 12, and is formed of a metal having high thermal conductivity such as copper.
  • the upper end portion and the lower end portion of the solid pillar portion 131 are joined to the lower surface of the first metal plate 11 and the upper surface of the second metal plate 12, respectively, using a brazing material.
  • the solid pillar portion 131 may be joined to the first metal plate 11 and the second metal plate 12 by welding or the like, in addition to joining with a brazing material. Further, the solid pillar portion 131 may be integrated with one of the first metal plate 11 and the second metal plate 12. At this time, the solid pillar portion 131 can be formed by etching or cutting the first metal plate 11 or the second metal plate 12. It was
  • the lower surface of the first metal plate 11 and the upper surface of the second metal plate 12 are respectively joined to the solid pillar portion 131.
  • the solid pillar portion 131 supports the first metal plate 11 and the second metal plate 12.
  • the porous column portion 132 is a porous column.
  • the porous column portion 132 has a void portion (not shown) that forms a flow path of the working medium 20.
  • the porous pillar portion 132 extends in the Z direction and is, for example, a columnar shape. Further, the porous column portions 132 are two-dimensionally and regularly arranged side by side in the XY plane. As shown in FIG. 3, the porous column portion 132 is preferably arranged in the middle of the adjacent solid column portions 131. It was
  • the first wick structure 31 is arranged in contact with the lower surface of the first metal plate 11 and faces the internal space 103.
  • the second wick structure 32 is arranged in contact with the upper surface of the second metal plate 12 and faces the internal space 103.
  • “facing" the interior space 103 means “facing” the interior space 103. That is, the first wick structure 31 is arranged on the first metal plate 11 side.
  • the second wick structure 32 is arranged on the second metal plate 12 side.
  • the first wick structure 31 is a porous sintered body.
  • the second wick structure 32 is also a porous sintered body.
  • the first wick structure 31 and the second wick structure 32 are made of a porous sintered body, but at least the second wick structure 32 is a plurality of metal linear members. May be a woven mesh member.
  • the porous column portion 132 is arranged in the internal space 103 and connects the first wick structure 31 and the second wick structure 32. As a result, the porous column portion 132 supports the first metal plate 11 and the second metal plate 12 via the first wick structure 31 and the second wick structure 32. Further, the porous column portion 132 may penetrate the first wick structure 31 and the second wick structure 32 to directly support the first metal plate 11 and the second metal plate 12. In either case, the porous pillar portion 132 plays a role of suppressing deformation of the housing 10 in the Z-axis direction. It was
  • the porous column portion 132 formed of the porous sintered body functions as a flow path of the working medium 20 from the first wick structure 31 to the second wick structure 32. As a result, the liquid working medium 20 can be efficiently moved from the first wick structure 31 to the second wick structure 32. It was
  • the solid column portion 131 has higher rigidity than the porous column portion 132. Then, as shown in FIG. 3, in the gap between the first wick structure 31 and the second wick structure 32, the ratio occupied by the solid pillar portion 131 is higher than the ratio occupied by the porous pillar portion 132. This makes it possible to enhance the effect of suppressing deformation due to the pressure difference between the inside and outside of the first metal plate and the second metal plate. It was
  • the first wick structure 31, the second wick structure 32, and the porous column portion 132 are integrated.
  • the first wick structure 31, the second wick structure 32, and the porous column portion 132 are formed, for example, as follows. First, a metal powder containing micro copper particles, a copper body and a resin is sprayed and applied to the lower surface of the first metal plate 11 and the upper surface of the second metal plate 12 before joining. Next, the first metal plate 11 and the second metal plate 12 are joined by sandwiching the metal powder formed into a columnar shape. After that, the housing 10 is heated to fire the metal powder. It was
  • the first wick structure 31, the second wick structure 32, and the porous pillar portion 132 can be easily integrally formed in the internal space 103 of the housing 10. As a result, the manufacturing cost of the heat conductive member 100 can be suppressed.
  • the first wick structure 31, the second wick structure 32 and the porous pillar portion 132 are joined to each other. You may. It was
  • coating means adhering metal powder to the lower surface of the first metal plate 11 and the upper surface of the second metal plate 12.
  • the metal powder may be directly applied. It was
  • Micro copper particles are particles in which a plurality of copper atoms are aggregated or bonded.
  • the particle size of the micro copper particles is 1 ⁇ m or more and less than 1 mm.
  • the micro copper particles are, for example, porous. It was
  • the copper body is a copper melt obtained by melting and solidifying sub-micro copper particles smaller than the micro copper particles by sintering.
  • Submicro copper particles are particles in which a plurality of copper atoms are aggregated or bonded.
  • the particle size of the sub-micro copper particles before melting is 0.1 ⁇ m or more and less than 1 ⁇ m. It was
  • the resin is a volatile resin that volatilizes at a temperature below the melting point of the copper constituting the micro copper particles and the copper body.
  • a volatile resin for example, a cellulose resin such as methyl cellulose or ethyl cellulose, an acrylic resin, a butyral resin, an alkyd resin, an epoxy resin, a phenol resin or the like can be used.
  • an acrylic resin having high thermal decomposability. It was
  • FIG. 4 is a perspective view of the second wick structure 32.
  • FIG. 5 is an enlarged cross-sectional view of the second wick structure 32 shown in FIG. 4 cut along a plane parallel to the YZ plane and enlarged.
  • FIG. 4 shows the second wick structure 32 alone, and the illustration of the column insertion hole into which the solid column portion 131 is inserted and the portion connected to the porous column portion 132 is omitted. That is, the actual second wick structure 32 has a through hole through which the solid pillar portion 131 penetrates. Further, when the porous pillar portion 132 penetrates the second wick structure, the second wick structure 32 also has a through hole through which the porous pillar portion 132 penetrates.
  • the second wick structure 32 has a plurality of openings 34 that open to the upper surface, that is, the facing surface 320 facing the first wick structure 31. That is, the second wick structure 32 has a plurality of openings 34 that open to the facing surface 320 facing the first wick structure 31 and extend in the thickness direction. It was
  • the second wick structure 32 has a plurality of openings 34, the vaporized working medium 20 can easily escape to the outside of the second wick structure 32. As a result, the working medium 20 heated and vaporized by the heating element Ht easily flows to the first wick structure 31 side and easily condenses. As a result, heat transport efficiency is improved. It was
  • the opening 34 has a through hole 341 and a recess 342.
  • the through hole 341 penetrates the second wick structure 32 in the Z direction, that is, in the thickness direction. That is, at least one of the openings 34 is a through hole 341 that penetrates the second wick structure 32 in the thickness direction.
  • the inside of the through hole 341 is directly heated by the heat from the second metal plate 12.
  • the vaporized working medium 20 inside the through hole 341 is heated and expanded, and as a result, a flow of the vaporized working medium 20 from the through hole 341 to the outside is formed. Therefore, the flow of the vaporized working medium 20 in the second wick structure 32 to the outside of the second wick structure 32 is promoted, and the heat transport efficiency is improved. It was
  • the recess 342 has a bottom portion 343 at the lower portion in the Z direction. That is, at least one of the openings 34 is a recess having a bottom portion 343 at the end on the second metal plate 12 side in the thickness direction of the second wick structure 32. It was
  • the second wick structure 32 has a flow portion 344 between the bottom portion 343 of the recess 342 and the second metal plate 12.
  • the capillary force of the flow portion 344 allows the liquid actuating medium 20 to flow below the bottom portion 343.
  • the liquid working medium 20 can be efficiently flowed to the overlapping region 105, which is a region facing the heating element Ht in the Z direction.
  • the overlapping region 105 is a region where heat from the heating element Ht is easily transferred. Therefore, the liquid working medium 20 can be efficiently flowed to the overlapping region 105 where the amount of heat transferred is large, and the heat transfer efficiency can be improved. It was
  • the opening 34 has a circular cross section cut along a plane orthogonal to the thickness direction of the second wick structure 32. More specifically, the cross-sectional shape of the through hole 341 and the recess 342 cut along the plane parallel to the XY plane is circular. With this configuration, the working medium 20 of the gas escaping from the opening of the opening 34 spreads in a circle. As a result, the bias when the gas working medium 20 spreads is suppressed, the gas working medium 20 in the second wick structure 32 can easily escape, and the heat transport efficiency can be improved. It was
  • the openings 34 are dispersed and arranged in a plane orthogonal to the thickness direction of the second wick structure 32 when the second wick structure 32 is viewed from the thickness direction (Z direction). Orthogonal. That is, the openings 34 are two-dimensionally distributed and arranged in a square grid pattern in the XY plane. It was
  • openings 34 By arranging the openings 34 two-dimensionally and dispersedly, a large number of openings 34 can be arranged on the facing surface 320 of the second wick structure 32, and more openings 34 can be arranged in the second wick structure 32.
  • the working medium 20 of the gas can be released to the outside. This makes it possible to improve the heat transport efficiency. It was
  • the openings 34 adjacent to each other in the X direction and the Y direction are arranged at the same interval. More specifically, in the second wick structure 32, the openings 34 are regularly arranged side by side in the X direction and the Y direction in the XY plane. As a result, the working medium 20 of the gas in the second wick structure 32 can easily escape to the outside, and the heat transport efficiency can be improved.
  • the spacing in the X direction and the spacing in the Y direction of the openings 34 are the same, but the spacing is not limited to this, and the spacing in the X direction and the spacing in the Y direction are different.
  • the openings 34 may be arranged in different rectangular grids. That is, the openings 34 adjacent to each other in one direction are arranged at the same interval. It was
  • the through holes 341 and the recesses 342 are arranged alternately in the X direction and alternately in the Y direction. With this configuration, it is possible to send the liquid working medium 20 to the overlapping region 105 while allowing the gas working medium 20 in the second wick structure 32 to escape to the outside. This makes it possible to improve the heat transport efficiency.
  • the second wick structure 32 has the configuration shown above. It was
  • the thickness W2 of the second wick structure 32 in the Z direction is the thickness W1 of the first wick structure 31 in the Z direction (hereinafter, simply referred to as the thickness W1). It is preferably larger than (referred to as).
  • the holding amount of the liquid working medium 20 of the second wick structure 32 is larger than the holding amount of the working medium 20 of the first wick structure 31. Further, as the holding amount of the working medium 20 of the second wick structure 32 is improved, the liquid working medium 20 held by the second wick structure 32 is provided in the overlapping region 105 overlapping with the heating element Ht in the Z direction. It is possible to suppress the occurrence of so-called dryout, which is completely vaporized. It was
  • the thickness W1 of the first wick structure 31, the thickness W2 of the second wick structure 32, and the length W3 of the gap between the first wick structure 31 and the second wick structure 32 are , It is preferable to satisfy the formula (1). It was
  • the working medium 20 vaporized from the second wick structure 32 is XY in the internal space 103. It becomes easy to diffuse in the plane. This promotes the condensation of the working medium 20 in the first wick structure 31. It was
  • the second wick structure 32 has a higher porosity than the first wick structure 31. As a result, the capillary force of the second wick structure 32 becomes larger than the capillary force of the first wick structure 31. It was
  • the ratio of the volume of the space to the total product of the first wick structure 31 and the second wick structure 32 is referred to as a porosity.
  • the unit of porosity is%.
  • the porosity is determined by the following method. For example, the porosity can be obtained by measuring the area of the space from the cross-sectional photograph of the wick structure and calculating the ratio of the area of the space to the whole.
  • a scanning electron microscope having a deep depth of field. The method of observing the cross section is not particularly limited as long as it can easily distinguish between the metal portion and the space. It was
  • the capillary force of the second wick structure 32 is higher than the capillary force of the first wick structure 31, the heated region where the heating element Ht is arranged on the liquid working medium 20 via the second wick structure 32. It can be moved faster by 101. Therefore, the heat transport efficiency by the working medium 20 is improved. It was
  • the heat conductive member 100 having the above-described configuration, the heat from the heating element Ht can be efficiently transported and the temperature rise of the heating element Ht can be suppressed. It was
  • FIG. 6 is an enlarged cross-sectional view of the second wick structure 32a of the first modification.
  • the second wick structure 32a is different from the second wick structure 32 in that it has an opening 35 instead of the opening 34 (see FIG. 5), but has the same configuration except for this. Therefore, a detailed description of substantially the same part will be omitted.
  • the opening 35 of the second wick structure 32a has a through hole 351 and a recess 352.
  • the through hole 351 and the recess 352 correspond to the through hole 341 and the recess 342 shown in FIG.
  • the recess 352 has a bottom portion 353 corresponding to the bottom portion 343. Further, below the bottom portion 353, a flow portion 354 corresponding to the flow portion 344 is formed. It was
  • the cross section of the through hole 351 cut along the plane parallel to the YZ plane becomes larger toward the upper side in the Z direction. Further, the cross section cut along the plane parallel to the YZ plane of the recess 352 becomes larger toward the upper side in the Z direction. That is, the cross-sectional area of the opening 35 increases toward the facing surface 320 of the second wick structure 32a. It was
  • the gas working medium 20 spreads along the inner peripheral surface of the opening 35 and escapes.
  • the working medium 20 of the gas in the second wick structure 32a can easily escape to the outside, and the heat transport efficiency can be improved. It was
  • FIG. 7 is an enlarged cross-sectional view of the second wick structure 32b of the second modification.
  • the second wick structure 32b shown in FIG. 7 is different from the second wick structure 32 in that it has an opening 36 instead of the opening 34 (see FIG. 5), but has the same configuration except for this. Therefore, a detailed description of substantially the same part will be omitted.
  • the through hole 361 and the recess 362 correspond to the through hole 341 and the recess 342.
  • the recess 362 has a bottom 363 (see FIG. 5) and a corresponding bottom 363 at the lower end. Further, below the bottom portion 363, a flow portion 364 corresponding to the flow portion 344 (see FIG. 5) is formed. It was
  • the ratio of the cross section increasing toward the upper side in the Z direction may increase. With such a configuration, the gas working medium 20 can be released more efficiently. It was
  • FIG. 8 is a plan view of the second wick structure 32c of the third modification.
  • the second wick structure 32c shown in FIG. 8 has the same configuration except for the arrangement of the openings 34 in the XY plane. Therefore, substantially the same parts are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the openings 34 of the second wick structure 32c are arranged at equal intervals in the X1 direction tilted 45 degrees with respect to the X direction and in the Y1 direction tilted 45 degrees with respect to the Y direction. Arranged in a square grid. Even if the openings 34 are arranged in this way, they have the same effect as when they are regularly arranged in the X direction and the Y direction. It was
  • the spacing in the X1 direction and the spacing in the Y1 direction of the openings 34 are the same, but the spacing is not limited to this, and the spacing in the X1 direction and the spacing in the Y1 direction are the same.
  • the openings 34 may be arranged in a rectangular grid pattern different from the above. Further, the angle of the X1 direction with respect to the X direction and the angle of the Y1 direction with respect to the Y direction are 45 degrees, but the angle is not limited thereto.
  • the X1 direction and the Y1 direction are orthogonal to each other, but the present invention is not limited to this, and even if the openings are arranged in an oblique grid with an angle other than 90 degrees between the X1 direction and the Y1 direction. good. In this case as well, it has the same effect. It was
  • FIG. 9 is a plan view of the second wick structure 32d of the fourth modification.
  • the second wick structure 32d shown in FIG. 9 has the same configuration except for the arrangement of the openings 34 in the XY plane. Therefore, substantially the same parts are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the opening 34 is arranged at the position of the apex of the equilateral triangle Tr spread on the facing surface 320. That is, the openings 34 are arranged in a regular triangular lattice pattern. As a result, the openings 34 are arranged in one direction at the same intervals. Even if the openings 34 are arranged in this way, they have the same effect as when they are regularly arranged in the X direction and the Y direction. It was
  • the equilateral triangle Tr is spread on the facing surface 320, but the present invention is not limited to this.
  • it may be a regular hexagon.
  • a shape that can be laid out regularly can be adopted. In this case as well, it has the same effect. It was
  • FIG. 10 is a plan view of the second wick structure 32e of the fifth modification.
  • the second wick structure 32e shown in FIG. 10 has the same configuration except for the arrangement of the openings 34 in the XY plane. Therefore, substantially the same parts are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the second wick structure 32e has a region 321 having a high density of the opening 34 in the facing surface 320 and a surrounding region 322.
  • the density of the openings 34 in the surrounding region 322 is lower than the density of the openings 34 in the dense region 321.
  • the high density region 321 partially overlaps with the overlapping region 105 in the Z direction. It was
  • the second wick structure 32e has a region 321 with a higher density of openings 34 than the surrounding region 322. Then, in the thickness direction of the second wick structure 32e, at least a part of the high density region 321 overlaps with the heating element Ht. It was
  • the vaporized working medium 20 in the second wick structure 32e becomes hotter in the overlapping region 105 than in other portions.
  • the second wick structure It is easy for the high-temperature vaporized working medium 20 in the body 32e to escape to the outside. Thereby, the heat transport efficiency of the second wick structure 32e can be improved. It was
  • the through holes 341 and the recesses 342 may be alternately arranged in the openings 34.
  • the recess 342 may be arranged in the high density region 321, and only the through hole 341 may be arranged in the surrounding region 322, or the through hole 341 and the recess 342 may be arranged.
  • the liquid working medium 20 can be efficiently moved to the overlapping region 105.
  • only the through hole 341 may be arranged in the high density region 321.
  • only the through hole 341 may be arranged, only the recess 342 may be arranged, or both the through hole 341 and the recess 342 may be arranged. It was
  • FIG. 11 is a plan view of the second wick structure 32f of another example.
  • the openings 34 may be arranged side by side only in the high density region 321 and the surrounding regions 322 may not have the openings 34 arranged. With this configuration, in the high density region 321 it is easy for the high temperature vaporized working medium 20 in the second wick structure 32f to escape to the outside. It was
  • FIG. 12 is a plan view of the second wick structure 32 g of still another example.
  • the openings 34 are arranged radially and circumferentially, here at equal intervals in the radial direction and at equal intervals in the circumferential direction. Will be done.
  • the surrounding area 322 may be configured such that the opening 34 is not arranged. Thereby, the heat transport efficiency can be improved.
  • the high temperature vaporized working medium 20 in the second wick structure 32g is easily released to the outside. It was
  • the opening 34 When the opening 34 is arranged only in the region 321 having a high density, the opening 34 may have a through hole 341 and a recess 342, or may have only the through hole 341 or only the recess 342. .. It was
  • heat conductive member 101 heated area 102 heat dissipation area 103 internal space 105 overlapping area 10 housing 11 first metal plate 111 first side wall part 12 second metal plate 121 second side wall part 13 pillar part 131 middle part 132 Quality pillar part 14 joint part 20 actuating medium 31 1st wick structure 32 2nd wick structure 320 facing surface 321 dense area 322 surrounding area 34 opening 35 opening part 36 a opening part H Body 341 through hole 342 recess 343 bottom bottom 344 flow part 32b second wick structure 351 through hole 352 recess 353 bottom 354 flow part 32c second wick structure 361 bottom 32 2nd wick structure 32f 2nd wick structure 32g 2nd wick structure

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

Élément de conduction thermique comprenant un logement comprenant un espace interne, une première structure de mèche, une seconde structure de mèche et un milieu de travail. Le logement comprend une première plaque métallique, une seconde plaque métallique agencée de façon à faire face à la première plaque métallique, et des parties de pilier disposées dans l'espace interne. Le milieu de travail, la première structure de mèche et la seconde structure de mèche sont disposés dans l'espace interne. La première structure de mèche est disposée sur le côté de la première plaque métallique. La seconde structure de mèche est disposée sur le côté de la seconde plaque métallique. La seconde structure de mèche comprend une pluralité d'ouvertures qui s'étendent dans le sens de l'épaisseur et est ouverte sur une surface faisant face à la première structure de mèche.
PCT/JP2021/028356 2020-07-31 2021-07-30 Élément de conduction thermique WO2022025261A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2020131230 2020-07-31
JP2020-131230 2020-07-31
JP2020-189871 2020-11-13
JP2020189871 2020-11-13
JP2021-088007 2021-05-25
JP2021088007A JP2023123892A (ja) 2020-11-13 2021-05-25 熱伝導部材

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WO2022025261A1 true WO2022025261A1 (fr) 2022-02-03

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49116647A (fr) * 1973-03-12 1974-11-07
JP2000018854A (ja) * 1998-06-30 2000-01-18 Showa Alum Corp ヒートパイプ
JP2000161879A (ja) * 1998-11-20 2000-06-16 Fujikura Ltd 平板状ヒートパイプ
JP2001091172A (ja) * 1999-09-21 2001-04-06 Fujikura Ltd 平板状ヒートパイプ
JP2002062067A (ja) * 2000-08-21 2002-02-28 Fujikura Ltd 平板型ヒートパイプ
JP2008522129A (ja) * 2004-12-01 2008-06-26 コンバージェンス テクノロジーズ リミテッド 沸騰促進マルチウィック構造物を備えた蒸気チャンバー
US20080174963A1 (en) * 2007-01-24 2008-07-24 Foxconn Technology Co., Ltd. Heat spreader with vapor chamber defined therein
WO2020100364A1 (fr) * 2018-11-16 2020-05-22 株式会社村田製作所 Chambre à vapeur et procédé de production de chambre à vapeur

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49116647A (fr) * 1973-03-12 1974-11-07
JP2000018854A (ja) * 1998-06-30 2000-01-18 Showa Alum Corp ヒートパイプ
JP2000161879A (ja) * 1998-11-20 2000-06-16 Fujikura Ltd 平板状ヒートパイプ
JP2001091172A (ja) * 1999-09-21 2001-04-06 Fujikura Ltd 平板状ヒートパイプ
JP2002062067A (ja) * 2000-08-21 2002-02-28 Fujikura Ltd 平板型ヒートパイプ
JP2008522129A (ja) * 2004-12-01 2008-06-26 コンバージェンス テクノロジーズ リミテッド 沸騰促進マルチウィック構造物を備えた蒸気チャンバー
US20080174963A1 (en) * 2007-01-24 2008-07-24 Foxconn Technology Co., Ltd. Heat spreader with vapor chamber defined therein
WO2020100364A1 (fr) * 2018-11-16 2020-05-22 株式会社村田製作所 Chambre à vapeur et procédé de production de chambre à vapeur

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