Laminated structure

Abstract

Provided is a laminated structure that suppresses damage to a heat conductive material due to the difference in thermal expansion between a heat pipe or heat generating device and the heat conductive material. The laminated structure (1) comprises a core (11) and a skin (12) provided on at least one surface of the core (11). The skin (12) includes a plurality of thermally conductive materials (17) extending on a plane including the skin (12) and a plurality of fiber bundles (18) extending on the plane including the skin (12) in a direction different from the extension direction of the thermally conductive materials (17). In a plurality of regions where the plurality of thermally conductive materials (17) and the plurality of fiber bundles (18) overlap, adjacent regions are formed such that the positions of the thermally conductive materials (17) and the fiber bundles (18) in the thickness direction of the skin are alternately changed.

Description

[Technical field]

[0001] The present disclosure relates to a laminated structure for use in an artificial satellite or the like. [Background technology]

[0002] Prior art discloses a sandwich structure having a core material and fiber reinforcing materials arranged on both sides of the core material, with at least one of the fiber reinforcing materials containing a sheet-like thermally conductive material (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 106563 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology, there was a problem that the thermal conductive material could be destroyed due to the difference in thermal expansion between the sheet-shaped thermal conductive material and heat-generating equipment adjacent to a sandwich structure, which is an example of a laminated structure.

[0005] The present disclosure has been made to solve the problems described above, and aims to provide a laminated structure that suppresses destruction of a thermal conductive material due to the difference in thermal expansion between a heat pipe or heat-generating equipment, etc. and the thermal conductive material. [Means for solving the problem]

[0006] The laminate structure according to the present disclosure comprises a core and A heat pipe provided inside the core;a skin provided on at least one surface of the core, the skin including a plurality of thermally conductive materials extending on a plane including the skin, and a plurality of fiber bundles extending on the plane including the skin in a direction different from the extending direction of the thermally conductive materials, and in a plurality of regions where the plurality of thermally conductive materials and the plurality of fiber bundles overlap, adjacent regions are formed such that the positions of the thermally conductive materials and the fiber bundles in the thickness direction of the skin are alternately changed. The thermal conductive material is arranged so that the extension direction of the thermal conductive material is perpendicular to the extension direction of the heat pipe. It is something. In addition, the laminate structure according to the present disclosure is The core includes a skin provided on at least one surface of the core, and a rectangular heat-generating device provided adjacent to the skin, wherein the skin includes a plurality of heat-conducting materials extending on a plane including the skin, and a plurality of fiber bundles extending on the plane including the skin in a direction different from the extension direction of the heat-conducting materials, and in a plurality of regions where the plurality of heat-conducting materials and the plurality of fiber bundles overlap, adjacent regions are formed such that the positions of the heat-conducting materials and the fiber bundles in the thickness direction of the skin are alternately switched, and the heat-conducting materials are arranged so that the extension direction of the heat-conducting materials is perpendicular to the long side direction of the heat-generating device in the plane including the skin. Effect of the Invention

[0007] According to the laminated structure of the present disclosure, it is possible to suppress damage to the thermal conductive material due to the difference in thermal expansion between the heat pipe or heat generating device and the thermal conductive material. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a laminated structure according to a first embodiment of the present disclosure. [Diagram 2] 1 is a perspective view of a laminated structure and a heat-generating device according to a first embodiment of the present disclosure. [Diagram 3] 2 is a schematic diagram corresponding to a cross section of the skin according to the first embodiment of the present disclosure taken along line BB' shown in FIG. 1. [Figure 4] 2 is a schematic top view of a thermal conduction layer according to the first embodiment of the present disclosure. FIG. [Diagram 5] 5 is a schematic diagram corresponding to a cross section of the thermal conduction layer according to the first embodiment of the present disclosure taken along line CC' in FIG. 4. [Figure 6] 5 is a schematic diagram corresponding to a cross section of the thermal conduction layer according to the first embodiment of the present disclosure taken along line DD' in FIG. 4. [Figure 7] FIG. 11 is a perspective view of a laminated structure according to a second embodiment of the present disclosure. [Figure 8]1. FIG. 4 is a schematic diagram corresponding to a cross section of a skin according to a third embodiment of the present disclosure taken along line BB' shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. Note that the drawings are schematic, and the relative sizes and positions shown in different drawings are not necessarily described accurately and may be changed as appropriate. In the following description, similar components are illustrated with the same reference numerals, and their names and functions are the same or similar. Therefore, detailed description thereof may be omitted.

[0010] Embodiment 1 A laminated structure 1 in the first embodiment will be described with reference to Figures 1 to 6. Figure 1 is a perspective view of the laminated structure 1 according to the first embodiment. The laminated structure includes, for example, a sandwich panel.

[0011] As shown in Fig. 1, the laminated structure 1 according to the present embodiment includes a core 11 which is a core material, a skin 12 provided on the upper surface of the core 11, and a skin 13 provided on the surface of the core 11 opposite to the surface on which the skin 12 is provided. The core 11 is sandwiched between the skins 12 and 13. For example, a structure in which the skins 12 and 13 sandwich the core 11 from both sides is called a sandwich structure. The core 11 is, for example, a flat plate having a thickness and extending in two dimensions.

[0012] Fig. 2 is a perspective view of the laminated structure 1 and the heat generating device 2 according to embodiment 1. As shown in Fig. 2, the laminated structure 1 is provided adjacent to the heat generating device 2. The heat generating device 2 is installed adjacent to a skin 12 of the laminated structure 1, for example.

[0013] 1 indicates an area on the skin 12, and for example, the frame line X is a rectangle. The heat-generating device 2 is mounted along the shape of the frame line X. That is, the heat-generating device 2 is in contact with the skin 12 within the area of ​​the frame line X. Note that the skin 12 and the heat-generating device 2 do not have to be in direct contact with each other, and may be in contact with each other via another member.

[0014] Heat generated in the heat generating device 2 is transferred to the skin 12 adjacent to the heat generating device 2. The heat transferred to the skin 12 is transferred via the core 11 to the skin 13 not adjacent to the heat generating device 2, and is discharged by radiation.

[0015] Furthermore, the heat transferred from the heat-generating device 2 to the skin 12 may be radiated away from an area of ​​the skin 12 that is not in contact with the heat-generating device 2, that is, an area not enclosed by the frame line X.

[0016] 1 and 2 show an example in which the heat generating device 2 is provided on the skin 12 side, but this is not limiting, and the heat generating device 2 may be provided on the skin 13 side. Furthermore, the heat generating device 2 may be provided on both the skin 12 and the skin 13.

[0017] Although FIG. 2 shows a case where one heat generating device 2 is provided, a plurality of heat generating devices 2 may be provided adjacent to the skin 12 or the skin 13.

[0018] 1 and 2 is a direction in which the length of the area of ​​heat generating device 2 in contact with skin 12 on a plane including skin 12 is the longest compared to other directions on the plane including skin 12.

[0019] When the heat generating device 2 has a rectangular parallelepiped shape, for example, the long side direction of the heat generating device 2 in a plane including the skin 12 may be direction A. When the long side direction of the heat generating device 2 is direction A, the short side direction of the heat generating device 2 in the plane including the skin 12 is perpendicular to direction A.

[0020] The heat generating device 2 does not have to be a rectangular parallelepiped, but may be a square prism or a cylinder, or may not be columnar.

[0021] It is desirable that the core 11, which is the core material of the laminated structure 1, has a honeycomb structure. A honeycomb structure refers to a structure formed by a planar assembly of hollow columnar cells. By making the core 11 have a honeycomb structure, it is possible to obtain a core 11 that is lightweight and has high rigidity.

[0022] Furthermore, in the case of a honeycomb structure, an aluminum alloy is desirable as a material for forming the core 11. By forming the core 11 from an aluminum alloy, it is possible to obtain a core 11 that is lightweight and has high thermal conductivity while suppressing costs.

[0023] The material forming the core 11 may be carbon fiber reinforced plastic or carbon fiber reinforced carbon.

[0024] Additionally, the core 11 may be formed using foamed resin, foamed aluminum alloy, or the like.

[0025] FIG. 3 is a schematic diagram of the skin 12 according to the first embodiment, corresponding to a cross section taken along line BB' in FIG.

[0026] As shown in FIG. 3, skin 12 includes outer skin layer 14 , outer skin layer 15 , and thermally conductive layer 16 .

[0027] The outer skin layer 15 is provided on the surface of the skin 12 facing the core 11. The outer skin layer 14 is provided on the side of the skin 12 opposite to the surface facing the core 11. In other words, the thermally conductive layer 16 is provided by being sandwiched between the outer skin layer 14 and the outer skin layer 15.

[0028] Here, it has been described that the skin 12 includes the outer skin layer 14, the outer skin layer 15, and the thermally conductive layer 16, but the skin 13 may have a similar configuration.

[0029] The following provides a more detailed explanation of the configuration of the thermally conductive layer 16. Fig. 4 is a schematic top view of the thermally conductive layer 16 according to embodiment 1. The top view refers to the surface of the thermally conductive layer 16 on the skin outer layer 14 side.

[0030] As shown in Fig. 4, the thermally conductive layer 16 includes a plurality of thermally conductive materials 17 and a plurality of fiber bundles 18. Fig. 4 shows a schematic diagram of a state in which a plurality of strip-shaped, fibrous or bundle-shaped thermally conductive materials 17 extend in the vertical direction of the paper of Fig. 4, and a plurality of fiber bundles 18 extend in the horizontal direction of the paper of Fig. 4, and are woven together.

[0031] The thermally conductive material 17 is, for example, in a sheet shape, and has a rectangular shape with a large difference between its long side and short side and is long in one direction.

[0032] When the thermal conductive material 17 is, for example, a rectangle that is long in one direction, the decrease in thermal conductivity of the thermal conductive material 17 can be suppressed compared to when stress is applied to the thermal conductive material 17 and the thermal conductive material 17 is destroyed.

[0033] The plurality of fiber bundles 18 extend on a plane including the skin 12 and in a direction different from the extending direction of the thermally conductive material 17. In Fig. 4, for example, the plurality of thermally conductive materials 17 and the plurality of fiber bundles 18 are perpendicular to each other.

[0034] The plurality of heat conductive materials 17 and the plurality of fiber bundles 18 are interwoven with each other. That is, in the plurality of regions where the plurality of heat conductive materials 17 and the plurality of fiber bundles 18 overlap, the adjacent plurality of regions are formed such that the positions of the heat conductive materials 17 and the fiber bundles 18 in the thickness direction of the skin 12 or the skin 13 are alternately switched.

[0035] The above-mentioned regions refer to regions where the thermally conductive material 17 and the multiple fiber bundles 18 overlap in the thickness direction of the skin 12. In Fig. 4, the multiple regions are shown adjacent to each other with no gaps, but depending on the respective widths of the multiple thermally conductive materials 17 and the multiple fiber bundles 18, the multiple regions may be adjacent to each other with gaps between them.

[0036] 4 shows a case where there are four vertical rows of thermally conductive materials 17 and four horizontal rows of fiber bundles 18, and four thermally conductive materials 17 and four fiber bundles 18 are woven together, but the number of thermally conductive materials 17 and fiber bundles 18 is not limited to four each. In addition, the number of thermally conductive materials 17 and fiber bundles 18 is not limited to the same, and may be different.

[0037] The thermally conductive materials 17 and the fiber bundles 18 are interwoven with each other, that is, formed so that they appear on the front and back of each other, so that the upper surface of the thermally conductive layer 16 has a checkered pattern as shown in Fig. 4. In other words, the thermally conductive materials 17 and the fiber bundles 18 appear alternately on the upper surface or the lower surface.

[0038] It is preferable that the multiple thermally conductive materials 17 and the multiple fiber bundles 18 are woven alternately one by one, but for example, two thermally conductive materials 17 may be woven into a set. Also, for example, two fiber bundles 18 may be woven into a set.

[0039] Even when a plurality of pieces or rows of thermally conductive materials 17 or fiber bundles 18 are woven into a set, the region where the thermally conductive materials 17 and fiber bundles 18 formed for each set overlap is one region. In other words, for the regions formed for each set, the positions of the thermally conductive materials 17 and the fiber bundles 18 in the thickness direction of the skin 12 or skin 13 in adjacent regions may be alternated.

[0040] The plurality of thermally conductive materials 17 and the plurality of fiber bundles 18 are interwoven with each other, so that they do not separate from each other and can integrally form the thermally conductive layer 16.

[0041] In addition, although Figure 4 shows an example in which the multiple thermally conductive materials 17 and the multiple fiber bundles 18 are perpendicular to each other, the multiple thermally conductive materials 17 and the multiple fiber bundles 18 do not have to be perpendicular to each other. For example, the angle between the multiple thermally conductive materials 17 and the multiple fiber bundles 18 may be greater than 0 degrees and less than 90 degrees.

[0042] FIG. 5 is a schematic diagram of thermally conductive layer 16 according to the first embodiment, corresponding to a cross section taken along line CC' in FIG.

[0043] 5, the thermally conductive material 17 passes alternately above and below a plurality of fiber bundles 18. Also, two fiber bundles 18 may be considered as a set, and the thermally conductive material 17 may pass alternately above and below each set.

[0044] The thermally conductive material 17 passes between the multiple fiber bundles 18. The thermally conductive material 17 is provided in a serpentine manner in the thickness direction of the thermally conductive layer 16. That is, the thermally conductive layer 16 has tensile strength and stretchability in the extension direction of the thermally conductive material 17.

[0045] Since the thermally conductive layer 16 has tensile strength and elasticity in the extension direction of the thermally conductive material 17, when a load is applied in the extension direction of the thermally conductive material 17, it is possible to prevent tensile stress from being immediately applied to the thermally conductive material 17 that is not slackened.

[0046] 5, the thermally conductive layer 16 includes gaps 19 in which the thermally conductive material 17 and the fiber bundles 18 are not present. The gaps 19 are filled with a resin.

[0047] The thermally conductive materials 17 may not be arranged without any gaps, and gaps 19 may exist between the thermally conductive materials 17. When gaps 19 exist between the thermally conductive materials 17, the resin filled in the gaps 19 may appear on the upper surface of the thermally conductive layer 16.

[0048] When resin is present in the gaps 19 between the multiple thermally conductive materials 17, the upper surface of the thermally conductive layer 16 will not have a perfect checkerboard pattern as shown in Figure 4, in which only the thermally conductive materials 17 and the fiber bundles 18 appear, but may have a checkered pattern in which the multiple thermally conductive materials 17 and the multiple fiber bundles 18 appear alternately, with further areas filled with resin scattered between the multiple thermally conductive materials 17 and the multiple fiber bundles 18.

[0049] FIG. 6 is a schematic diagram of thermally conductive layer 16 according to embodiment 1, corresponding to a cross section taken along line DD' in FIG.

[0050] 6, the fiber bundle 18 passes alternately above and below a plurality of heat conductive materials 17. Also, two heat conductive materials 17 may be considered as a set, and the fiber bundle 18 may pass alternately above and below each set.

[0051] The fiber bundles 18 pass between the plurality of thermally conductive materials 17. The fiber bundles 18 are provided meandering in the thickness direction of the thermally conductive layer 16. That is, the thermally conductive layer 16 has tensile strength and stretchability in the extension direction of the fiber bundles 18.

[0052] The thermally conductive layer 16 has tensile strength and elasticity in the extension direction of the fiber bundle 18, so that when a load is applied in the extension direction of the fiber bundle 18, it can prevent tensile stress from being immediately applied to the fiber bundle 18 that is not slackened.

[0053] 6, the thermally conductive layer 16 includes gaps 19 in which the thermally conductive material 17 and the fiber bundles 18 are not present. The gaps 19 are filled with a resin.

[0054] The multiple fiber bundles 18 may not be arranged without any gaps, and gaps 19 may exist between the multiple fiber bundles 18. When gaps 19 exist between the multiple fiber bundles 18, resin filled in the gaps 19 may exist on the upper surface of the thermally conductive layer 16.

[0055] When resin is present in the gaps 19 between the multiple fiber bundles 18, the upper surface of the thermally conductive layer 16 will not have a perfect checkerboard pattern as shown in Figure 4, in which only the thermally conductive material 17 and the fiber bundles 18 appear, but may have a checkered pattern in which multiple thermally conductive materials 17 and multiple fiber bundles 18 appear alternately, with additional areas filled with resin scattered between the multiple thermally conductive materials 17 and the multiple fiber bundles 18.

[0056] Furthermore, even if resin is filled into the gaps 19 of the thermally conductive layer 16 where no thermally conductive material 17 or fiber bundles 18 are present and the resin covers a plurality of thermally conductive materials 17 and a plurality of fiber bundles 18, if the resin is transparent, a checkered or chequered pattern as shown in Figure 4 may appear on the surface of the thermally conductive layer 16.

[0057] The thermally conductive material 17 is woven with fiber bundles 18 extending in a direction different from the extension direction of the thermally conductive material 17, and the fiber bundles 18 are inserted between a plurality of thermally conductive materials 17, so that when a load is applied in a direction different from the extension direction of the thermally conductive material 17, the fiber bundles 18 can bear the load applied in a direction different from the extension direction of the thermally conductive material 17.

[0058] By having the fiber bundles 18 bear the load applied in a direction different from the extension direction of the thermally conductive material 17, it is possible to prevent the thermally conductive material 17 and the resin filled in the gaps 19 from being destroyed.

[0059] Moreover, it is desirable that the extension direction of the fiber bundles 18 is perpendicular to the extension direction of the thermally conductive material 17. By having the extension direction of the fiber bundles 18 perpendicular to the extension direction of the thermally conductive material 17, that is, coinciding with the short side direction of the thermally conductive material 17, the load applied to the thermally conductive material 17 can be reduced to the greatest extent, and the heat received by the laminated structure 1 can be efficiently diffused.

[0060] Here, the thermal expansion of the thermally conductive material 17 and the like will be described.

[0061] Generally, materials have the property of thermal expansion, which means that their volume changes with temperature changes, and the rate of thermal expansion varies depending on the type of material. In other words, even if different types of materials have the same volume and are placed at the same temperature, the amount of thermal expansion caused by temperature changes will differ depending on the type of material.

[0062] When components made of different materials are in contact with each other, there will be a difference in the amount of thermal expansion that occurs due to temperature changes, and the component with the smaller amount of thermal expansion may be pulled by the component with the larger amount of thermal expansion and become deformed.

[0063] In addition, the greater the temperature change, the greater the amount of thermal expansion, and the greater the difference in the amount of thermal expansion between contacting parts made of different materials. As the difference in the amount of thermal expansion increases, the force exerted on the parts also increases, increasing the possibility of deformation.

[0064] The laminated structure 1 according to the present embodiment can be mounted on an artificial satellite. In a space environment, temperature changes are particularly large depending on the presence or absence of solar radiation, and for example, the low temperature may be -200°C and the high temperature may be 100°C, resulting in a temperature difference of 300°C. In other words, the laminated structure 1 is subject to large temperature changes during use.

[0065] It is desirable to select a material with high thermal conductivity for the thermal conductive material 17. However, when a material with high thermal conductivity is selected, the mechanical properties of the thermal conductive material 17 may be low, i.e., the material may have a low ability to withstand loads.

[0066] In other words, there is a high possibility that the thermally conductive material 17 will be destroyed when subjected to a load. Since the thermally conductive material 17 is mainly responsible for the thermal conduction of the laminated structure 1, if the thermally conductive material 17 is destroyed, the thermal conductivity of the laminated structure 1 will decrease.

[0067] Differences in thermal expansion occur when the materials are different, but since the main cause of the decrease in thermal conductivity is the destruction of the thermal conductive material 17, the difference in thermal expansion between the thermal conductive material 17 and other components is a particular issue.

[0068] In the present embodiment, the difference in thermal expansion between the thermally conductive material 17 and the heat generating device 2 is particularly large. Therefore, by forming the thermally conductive layer 16 so as to correspond to the difference in thermal expansion between the thermally conductive material 17 and the heat generating device 2, the effect of suppressing the destruction of the thermally conductive material 17 can be more significantly obtained.

[0069] The difference in the amount of thermal expansion between the thermally conductive material 17 and the heat generating device 2 is greatest in direction A shown in Fig. 1. Fig. 1 shows an example in which the heat generating device 2 is a rectangular parallelepiped, and direction A is the direction of the long side of the heat generating device 2 in a plane including the skin 12.

[0070] It is desirable that the extension direction of the thermally conductive material 17 is different from the direction A, that is, different from the long side direction of the heat generating device 2.

[0071] By providing the extension direction of the thermal conductive material 17 in a direction different from direction A, the length of the thermal conductive material 17 in direction A becomes smaller than when the thermal conductive material 17 is provided so that the extension direction of the thermal conductive material 17 is the same as direction A. When the length of the thermal conductive material 17 in direction A is small, the length of the thermal conductive material 17 that is affected by being pulled in direction A is also small.

[0072] That is, the possibility that the thermally conductive material 17 is pulled in the direction A and broken can be further reduced.

[0073] In addition, by setting the extension direction of the thermal conductive material 17 in a direction different from direction A, the thermal conductive material 17 is promoted to transport the heat transferred from the heat generating device 2 to the thermal conductive material 17, i.e., the thermal conductive material 17 is promoted to diffuse the heat.

[0074] Furthermore, it is more desirable that the thermal conductive material 17 is arranged so that the short side direction of the thermal conductive material 17 is the same direction as direction A, that is, the thermal conductive material 17 is arranged so that the extension direction of the thermal conductive material 17 is perpendicular to direction A.

[0075] By arranging the thermal conductive material 17 so that the extension direction of the thermal conductive material 17 is perpendicular to the direction A, the length of the thermal conductive material 17 in the direction A is further reduced, thereby reducing the possibility of the thermal conductive material 17 being destroyed.

[0076] Furthermore, by arranging the extension direction of the thermal conductive material 17 perpendicular to direction A, the transport of heat transferred from the heat generating device 2 to the thermal conductive material 17 by the thermal conductive material 17, i.e., the diffusion of heat by the thermal conductive material 17, is further promoted.

[0077] The tensile strength of the fiber bundle 18 is desirably higher than that of the thermally conductive material 17. By using the fiber bundle 18 having a higher tensile strength than the thermally conductive material 17, the fiber bundle 18 can be made to bear a load. By making the fiber bundle 18 bear a load, damage to the thermally conductive layer 16 can be suppressed. In particular, damage to the thermally conductive material 17 contained in the thermally conductive layer 16 can be suppressed.

[0078] It is desirable that the extension direction of the fiber bundle 18 is different from the direction perpendicular to the direction A, that is, the short side direction of the heat generating device 2.

[0079] By arranging the extension direction of the fiber bundle 18 to be different from the direction perpendicular to the direction A, the component of the load in the direction A borne by the fiber bundle 18 becomes larger than when the extension direction of the fiber bundle 18 is arranged in the direction perpendicular to the direction A. By increasing the component of the load in the direction A borne by the fiber bundle 18, the fiber bundle 18 can bear more of the load acting in the direction A.

[0080] Since the fiber bundles 18 can bear more of the load applied in the direction A, the possibility that the thermally conductive material 17 and the resin filled in the gaps 19 will be destroyed can be further reduced.

[0081] Furthermore, it is more desirable that the extension direction of the fiber bundle 18 is the same as the direction A, that is, the same as the long side direction of the heating device 2.

[0082] By arranging the extension direction of the fiber bundle 18 in the same direction as direction A, the component of the load borne by the fiber bundle 18 in direction A becomes larger, and the fiber bundle 18 can bear more of the load acting in direction A.

[0083] Since the fiber bundles 18 can bear more of the load applied in the direction A, the possibility that the thermally conductive material 17 and the resin filled in the gaps 19 will be destroyed can be further reduced.

[0084] The outer skin layer 14 and the outer skin layer 15 include fiber-reinforced plastic. By forming the outer skin layer 14 and the outer skin layer 15 from fiber-reinforced plastic, the weight can be reduced.

[0085] The fiber-reinforced plastic used in the outer skin layers 14 and 15 may be a laminate of continuous fibers, or may be one using discontinuous fibers such as short fibers or long fibers.

[0086] Furthermore, the outer skin layer 14 and the outer skin layer 15 may be made of the same material or different materials.

[0087] The outer skin layers 14 and 15 may also be deformed or destroyed due to the difference in thermal expansion between them and the heat-generating device 2 in particular.

[0088] When continuous carbon fibers are used for the skin outer layers 14 and 15, it is desirable to control the fiber orientation and fiber content so as to reduce the difference in thermal expansion between the heat generating device 2 and the skin outer layers 14 and 15.

[0089] The orientation of the fibers can be controlled and laminated so that the difference in thermal expansion between the heat generating device 2 and the outer skin layers 14 and 15 achieves the desired physical properties, and the ratio of resin to fiber can be controlled in the impregnation process.

[0090] It is desirable for the fiber bundle 18 to contain carbon fiber. For example, it is desirable to use PAN (Polyacrylonitrile)-based carbon fiber for the fiber bundle 18. Since PAN-based carbon fiber has a higher strength than other fibers, the fiber bundle 18 can withstand a large load.

[0091] When there are large temperature changes in the usage environment, or when it is believed that there will be large deformations due to differences in thermal expansion, it is desirable to use PAN-based carbon fibers with higher strength.

[0092] When the load applied to the fiber bundle 18 is not expected to be large, it is desirable to use pitch-based carbon fibers.

[0093] By using pitch-based carbon fibers having high thermal conductivity, the thermal conductivity of the fiber bundles 18 is improved, and the ability of the thermally conductive layer 16 to transport heat can be improved.

[0094] Furthermore, when the load applied to the fiber bundle 18 is not considered to be large, the fiber bundle 18 may be made of inorganic fibers such as glass fibers or ceramic fibers.

[0095] It is desirable to use a material having a thermal conductivity of 300 W / mK or more for the thermal conductive material 17. By using a material having a thermal conductivity of 300 W / mK or more, it is possible to obtain a higher heat dissipation performance than when using aluminum or the like.

[0096] For example, it is desirable to use highly heat-conductive graphite as the material for the heat-conducting material 17. Note that a composite material using pitch-based carbon fiber, carbon nanotubes, or the like may also be used.

[0097] When the skin 12 or 13 includes the thermally conductive layer 16, the thickness of the skin outer layer 14 and the skin outer layer 15 in the stacking direction is, for example, about 0.1 mm to 2 mm. The thickness of the thermally conductive layer 16 in the stacking direction is, for example, about 0.01 mm to 1 mm. When the skin 12 or 13 does not include the thermally conductive layer 16, the thickness of the skin outer layer 15 in the stacking direction is, for example, about 0.5 mm to 5 mm. The thickness of the core 11 in the stacking direction is, for example, about 10 mm to 200 mm.

[0098] In this embodiment, the thermally conductive material 17 is rectangular in shape, but a plurality of thermally conductive materials 17 may be partially connected to each other.

[0099] The widths of the plurality of thermally conductive materials 17, i.e., the dimensions in the short side direction, may be the same or different. The thicknesses of the plurality of thermally conductive materials 17, i.e., the dimensions in the stacking direction of the core 11, the skin 12, the skin 13, etc. of the laminated structure 1, may be the same or different.

[0100] Furthermore, the multiple fiber bundles 18 may be partially connected.

[0101] The widths of the fiber bundles 18, i.e., the dimensions in the direction perpendicular to the stretching direction, may be the same or different. The thicknesses of the fiber bundles 18, i.e., the dimensions in the stacking direction of the core 11, skin 12, skin 13, etc. of the laminated structure 1 may be the same or different.

[0102] The resin filled in the gap 19 is desirably the same as the resin used in the skin outer layer 14 or the skin outer layer 15. The gap 19 may be formed by allowing the resin to enter the gap 19 when the skin outer layer 14 or the skin outer layer 15 is formed.

[0103] The same resin as that used for skin outer layer 14 or skin outer layer 15 is used for gap portion 19, and gap portion 19 is molded integrally at the same time as skin outer layer 14 or skin outer layer 15, thereby increasing the strength of gap portion 19.

[0104] In addition, in the gaps 19, an adhesive used for bonding the outer skin layer 14 or the outer skin layer 15 to the thermally conductive material 17 or the fiber bundles 18 may be used.

[0105] Skin 13 may be formed in the same manner as skin 12. Moreover, unlike skin 12, skin 13 may not include thermally conductive layer 16. Moreover, skin 13 may be formed of a material different from that of skin 12, for example, may be formed of an aluminum alloy or the like.

[0106] Moreover, it is sufficient that a skin is provided on at least one surface of the core 11. In other words, it is not necessary that both the skin 12 and the skin 13 are provided, and only one of them may be provided.

[0107] Embodiment 2 The laminated structure 3 in the second embodiment will be described with reference to Fig. 7. Descriptions of the same configuration as in the first embodiment will be omitted. In Fig. 7, the same reference numerals as in Figs. 1 to 6 indicate the same or corresponding parts.

[0108] Fig. 7 is a perspective view of the laminated structure 3 according to the embodiment 2. As shown in Fig. 7, the laminated structure 3 according to the present embodiment differs from the laminated structure 3 of the embodiment 2 in that a heat pipe 20 is included inside the core 11. The following mainly describes the differences from the laminated structure 3 of the embodiment 1.

[0109] As shown in Fig. 7, a heat pipe 20 is provided inside the core 11. Also, the dashed lines in Fig. 7 indicate that the heat pipe 20 is provided at a position sandwiched between the dashed lines.

[0110] The heat pipe 20 penetrates the laminated structure 3 according to the second embodiment and extends in the left-right direction of the paper surface of Fig. 7. The heat pipe 20 extending from the laminated structure 3 is connected to a device such as a radiator (not shown) in an area (not shown). The laminated structure 3 receives heat from sunlight, etc. The heat received by the laminated structure 3 is transferred to the heat pipe 20, which transports the heat. The heat received by the heat pipe 20 is received by the radiator, and the heat transferred to the radiator is dissipated by radiation from the radiator.

[0111] 7 is the extension direction of the heat pipe 20. If the heat pipe 20 is, for example, cylindrical, the extension direction of the heat pipe 20 is the height direction of the cylinder. Also, the cross-sectional direction of the heat pipe 20 is the direction of a circular surface corresponding to the bottom of the heat pipe 20 if the heat pipe 20 is a bottomed cylinder.

[0112] The heat pipe 20 is not limited to being cylindrical.

[0113] In the present embodiment, the difference in thermal expansion between the thermal conductive material 17 and the heat pipe 20 is particularly large. Therefore, by forming the thermal conductive layer 16 so as to correspond to the difference in thermal expansion between the thermal conductive material 17 and the heat pipe 20, the effect of suppressing the destruction of the thermal conductive material 17 can be more effectively obtained.

[0114] The difference in the amount of thermal expansion between the thermally conductive material 17 and the heat pipe 20 is greatest in direction E shown in Fig. 7. Fig. 7 shows an example in which the heat pipe 20 is cylindrical, and direction E is the height direction of the cylinder, i.e., the extension direction.

[0115] It is desirable that the extension direction of the thermally conductive material 17 is different from the direction E, that is, different from the extension direction of the heat pipe 20.

[0116] By providing the extension direction of the thermal conductive material 17 in a direction different from the direction E, the component of the load borne by the thermal conductive material 17 in the direction E is smaller than when the thermal conductive material 17 is provided so that the extension direction of the thermal conductive material 17 is the same as the direction E. When the component of the load borne by the thermal conductive material 17 in the direction E is small, the length of the thermal conductive material 17 that is affected by being pulled in the direction E is also small.

[0117] That is, the possibility that the thermally conductive material 17 is pulled in the direction E and broken can be further reduced.

[0118] In addition, by setting the extension direction of the thermal conductive material 17 in a direction different from direction E, the thermal conductive material 17 is promoted to transport the heat transferred from the heat pipe 20 to the thermal conductive material 17, i.e., the thermal conductive material 17 is promoted to diffuse the heat.

[0119] Furthermore, it is more desirable that the thermally conductive material 17 is arranged so that the short side direction of the thermally conductive material 17 is in the same direction as direction E, that is, that the extension direction of the thermally conductive material 17 is perpendicular to direction E.

[0120] By arranging the thermal conductive material 17 so that the extension direction of the thermal conductive material 17 is perpendicular to the direction E, the component of the load borne by the thermal conductive material 17 in the direction E is further reduced, thereby reducing the possibility of the thermal conductive material 17 being destroyed.

[0121] In addition, by arranging the extension direction of the thermal conductive material 17 perpendicular to the direction E, the thermal conductive material 17 is able to transport the heat transferred from the heat pipe 20 to the thermal conductive material 17, i.e., the thermal conductive material 17 is able to diffuse the heat.

[0122] The tensile strength of the fiber bundles 18 is desirably higher than the tensile strength of the thermally conductive material 17. By using fiber bundles 18 having a higher tensile strength than the thermally conductive material 17 and allowing the fiber bundles 18 to bear the load, it is possible to suppress damage to the thermally conductive layer 16.

[0123] It is desirable that the extension direction of the fiber bundle 18 is different from the direction perpendicular to the direction E, that is, the cross-sectional direction of the heat pipe 20.

[0124] By arranging the extension direction of the fiber bundle 18 to be different from the direction perpendicular to the direction E, the component of the load in the direction E borne by the fiber bundle 18 becomes larger than when the extension direction of the fiber bundle 18 is arranged in the direction perpendicular to the direction E. By increasing the component of the load in the direction E borne by the fiber bundle 18, the fiber bundle 18 can bear more of the load acting in the direction E.

[0125] Since the fiber bundles 18 can bear more of the load acting in the direction E, the possibility that the thermally conductive material 17 and the resin filled in the gaps 19 will be destroyed can be further reduced.

[0126] Furthermore, it is more desirable that the extension direction of the fiber bundle 18 is the same as the direction E, that is, the same as the extension direction of the heat pipe 20.

[0127] By arranging the extension direction of the fiber bundle 18 in the same direction as the direction E, the component of the load borne by the fiber bundle 18 in the direction E becomes larger, and the fiber bundle 18 can bear more of the load acting in the direction E.

[0128] Since the fiber bundles 18 can bear more of the load acting in the direction E, the possibility that the thermally conductive material 17 and the resin filled in the gaps 19 will be destroyed can be further reduced.

[0129] Also, although the heat generating device 2 is not shown in FIG. 7, the laminated structure 3 of this embodiment may be provided adjacent to the heat generating device 2, similar to that shown in FIG. 2 in embodiment 1.

[0130] The laminated structure 3 receives heat from the heat-generating device 2. The heat generated in the heat-generating device 2 is transferred to the skin 12 adjacent to the heat-generating device 2. The heat transferred to the skin 12 is transferred via the core 11 to the skin 13 not adjacent to the heat-generating device 2, and is discharged by radiation.

[0131] The heat transferred to the skin 12 or the skin 13 is transferred via a heat pipe 20 included in the core 11 to a device such as a radiator (not shown) connected to the heat pipe 20 .

[0132] In addition, by setting the extension direction of the thermal conductive material 17 in a direction different from direction E, the thermal conductive material 17 is promoted to transport the heat transferred from the heat generating device 2 to the thermal conductive material 17, i.e., the thermal conductive material 17 is promoted to transfer the heat to the heat pipe 20.

[0133] Furthermore, by arranging the extension direction of the thermal conductive material 17 perpendicular to the direction E, the thermal conductive material 17 is able to transport the heat transferred from the heat generating device 2 to the thermal conductive material 17, i.e., the thermal conductive material 17 is able to transfer heat to the heat pipe 20.

[0134] Embodiment 3 The skin 12 in the third embodiment will be described with reference to Fig. 8. Descriptions of the same configuration as in the first embodiment will be omitted. In Fig. 8, the same reference numerals as in Figs. 1 to 7 indicate the same or corresponding parts.

[0135] Fig. 8 is a schematic diagram of a cross section of skin 12 according to embodiment 3 taken along line BB' in Fig. 1. As shown in Fig. 8, skin 12 according to the present embodiment differs from skin 12 of embodiment 1 in that it is provided with insulating part 22. The following description will focus on the differences from skin 12 of embodiment 1.

[0136] As shown in FIG. 8, an insulating portion 22 is provided at the end of the skin 12 .

[0137] The insulating portion 22 may be made of, for example, epoxy resin or fluororesin.

[0138] When a carbon-based material is used for the thermally conductive layer 16 and an aluminum alloy is used for the core 11 or the heat pipe 20, there is a possibility that galvanic corrosion will occur due to the potential difference between the carbon and the aluminum.

[0139] Providing the insulating portion 22 at the end of the skin 12 can suppress galvanic corrosion in the laminated structure 1 and the laminated structure 3. By suppressing galvanic corrosion, it is possible to suppress the formation of corrosion products in the core 11 and the heat pipe 20, and to suppress the deterioration of the heat transport capacity of the laminated structure 1 and the laminated structure 3.

[0140] It is desirable that the insulating portion 22 be provided over the entire end portion of the skin 12, but it may be provided over only a part of the end portion.

[0141] Moreover, the position where the insulating portion 22 is provided may be an end portion of the core 11. It is sufficient that the insulating portion 22 is provided on at least one of the skin 12 and the core 11.

[0142] When the insulating portion 22 is provided on the skin 12, processing is easier than when the insulating portion 22 is provided on the end portion of the core 11.

[0143] The skin provided on the surface of core 11 opposite skin 12 may be the same as or different from skin 12, and may be the same as or different from skin 13.

[0144] The manufacturing method of the thermally conductive layer 16 according to the first to third embodiments includes a step of weaving a plurality of thermally conductive materials 17 and a plurality of fiber bundles 18. The plurality of thermally conductive materials 17 and the plurality of fiber bundles 18 are woven as warp and weft threads, respectively.

[0145] The method of manufacturing the thermally conductive layer 16 according to the first to third embodiments includes the step of impregnating a knitted material made of a plurality of thermally conductive materials 17 and a plurality of fiber bundles 18 with a resin to fill gaps 19 with the resin.

[0146] In addition, in each of the above embodiments described in this specification, the material, material, size, shape, relative positional relationship, or implementation conditions of each component may be described, but these are examples in all aspects and are not limited to the embodiments described. Therefore, countless modified examples not exemplified are expected within the scope of each embodiment. For example, this includes cases where any component is modified, added, or omitted, and further cases where at least one component in at least one embodiment is extracted and combined with a component of another embodiment.

[0147] Needless to say, various design modifications are possible within the scope of the present invention without departing from the gist of the present invention. [Explanation of symbols]

[0148] 1, 3 laminated structure, 2 heat generating device, 11 core, 12 skin, 13 skin, 14 outer skin layer, 15 outer skin layer, 17 thermally conductive material, 18 fiber bundle, 20 heat pipe, 22 insulation part

Claims

1. A core, A skin provided on at least one surface of the core; A heat pipe provided inside the core; Equipped with the skin includes a plurality of thermally conductive materials extending on a plane including the skin, and a plurality of fiber bundles extending on the plane including the skin in a direction different from the extending direction of the thermally conductive materials, In a plurality of regions where the plurality of thermally conductive materials and the plurality of fiber bundles overlap, adjacent regions are formed such that positions of the thermally conductive materials and the fiber bundles in the thickness direction of the skin are alternately switched, The thermally conductive material is arranged so that the extension direction of the thermally conductive material is perpendicular to the extension direction of the heat pipe. Laminated structure.

2. A core, A skin provided on at least one surface of the core; A rectangular parallelepiped heat generating device provided adjacent to the skin; Equipped with the skin includes a plurality of thermally conductive materials extending on a plane including the skin, and a plurality of fiber bundles extending on the plane including the skin in a direction different from the extending direction of the thermally conductive materials, In a plurality of regions where the plurality of thermally conductive materials and the plurality of fiber bundles overlap, adjacent regions are formed such that positions of the thermally conductive materials and the fiber bundles in the thickness direction of the skin are alternately switched, The thermally conductive material is arranged so that the extension direction of the thermally conductive material is perpendicular to the long side direction of the heat generating device in a plane including the skin. Laminated structure.

3. The tensile strength of the fiber bundle is higher than the tensile strength of the thermal conductive material. The laminated structure according to claim 1 or 2.

4. The thermal conductive material has a thermal conductivity of 300 W / mK or more. The laminated structure according to claim 1 or 2.

5. The fiber bundle includes carbon fibers. The laminated structure according to claim 1 or 2.

6. The skin has an outer skin layer on a surface on the core side and a surface opposite to the surface on the core side, The outer skin layer comprises a fiber reinforced plastic. The laminated structure according to claim 1 or 2.

7. An insulation portion is provided at the end of the skin or the core. The laminated structure according to claim 1 or 2.