CN220454356U

CN220454356U - Thermal diffusion device and electronic apparatus

Info

Publication number: CN220454356U
Application number: CN202190000766.3U
Authority: CN
Inventors: 沼本龙宏
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2020-10-06
Filing date: 2021-09-27
Publication date: 2024-02-06
Anticipated expiration: 2031-09-27
Also published as: JP7120494B1; WO2022075108A1; JPWO2022075108A1

Abstract

A soaking plate (1) of one embodiment of a heat diffusion device is provided with a case (10), a working medium (20), and a core (30). The core (30) includes a plurality of cores (40) extending from the evaporation unit (EP) in a linear shape and at least partially contacting at least one of the 1 st inner wall surface (11 a) and the 2 nd inner wall surface (12 a). A vapor flow path (50) is formed between at least 1 group of adjacent cores (40). In the adjacent cores (40), a 1 st liquid flow path (51) is formed in a space surrounded by at least a part of each core (40) and a part of the housing (10). A2 nd liquid flow path (52) is formed by providing a groove in at least one of the surfaces of the core (40) which are in contact with the 1 st inner wall surface (11 a) or the 2 nd inner wall surface (12 a) in the direction in which the core (40) extends.

Description

Thermal diffusion device and electronic apparatus

Technical Field

The present utility model relates to thermal diffusion a device and an electronic apparatus.

Background

In recent years, the amount of heat generated by the high integration and high performance of elements has increased. Further, as products are miniaturized more and more, heat generation density is increased, and thus, heat dissipation countermeasures become important. This situation is particularly remarkable in the field of mobile terminals such as smart phones and tablet computers. As the heat countermeasure member, a graphite sheet or the like is often used, but the heat transport amount thereof is insufficient, and therefore, various heat countermeasure members are being studied. Among them, as a heat diffusion device capable of extremely effectively diffusing heat, a vapor chamber using a heat pipe as a planar heat pipe is being studied.

The vapor chamber has a structure in which a working medium is enclosed in a casing and a core for transporting the working medium by capillary force. The working medium absorbs heat from the heating element at the evaporation portion that absorbs heat from the heating element, evaporates in the soaking plate, and then moves in the soaking plate, and is cooled to return to the liquid phase. The working medium returned to the liquid phase moves again to the evaporation portion on the heating element side due to the capillary force of the core portion, the heating element is cooled. By repeating this operation, the vapor chamber can operate autonomously without external power, and heat can be spread at a high speed in two dimensions by utilizing the latent heat of evaporation and the latent heat of condensation of the working medium.

In order to cope with the light and thin of mobile terminals such as smart phones and tablet computers, the vapor chamber is also required to be light and thin. In such a thin vapor chamber of the type described above, it is not easy to ensure mechanical strength and heat transfer efficiency.

For this reason, as described in patent documents 1 and 2, there are proposed: in order to secure the mechanical strength of the case constituting the vapor chamber, a core portion disposed inside the case is used as a support body for maintaining the shape of the case.

In the heat transfer tube described in patent document 1, the 1 st core portion and the 2 nd core portion are arranged with a gap therebetween in the left-right direction, the liquid-phase working medium fills the liquid accumulation portion formed between the 1 st core portion and the 2 nd core portion. According to patent document 1, with the above-described configuration, the working medium in the liquid phase can be reliably returned to the evaporation unit through the liquid accumulation unit, and therefore, stagnation of the flow of the working medium in the liquid phase can be prevented, and a reduction in heat transfer efficiency can be suppressed.

In the soaking plate described in patent document 2, a liquid flow path for condensed working fluid is formed in a space surrounded by a pair of inner wall surfaces facing each other of a housing, a side surface of a core portion which does not contact the pair of inner wall surfaces, and a facing surface formed by a gap between the side surface of the core portion and the facing surface. According to patent document 2, since the core and the liquid accumulation flow path are combined, the liquid can be always supplied to the core, and thus, the pressure loss of the liquid in the entire liquid flow path can be reduced, and as a result, the maximum heat transfer amount of the vapor chamber can be increased.

Patent document 1: japanese patent laid-open publication No. 2018-185110

Patent document 2: japanese patent No. 6442594

As described in patent documents 1 and 2, if a liquid flow path is formed between the core portions, stagnation of the flow of the liquid-phase working medium can be prevented. However, if the liquid flow path is increased in order to increase the maximum heat transfer amount of the vapor chamber, the heat transfer rate of the vapor chamber may be reduced.

The above-described problem is not limited to the soaking plate, and is a problem that the soaking plate can coexist in a heat diffusion device that can diffuse heat with the same structure as the soaking plate.

Disclosure of Invention

The present utility model has been made to solve the above-described problems, and an object thereof is to provide a heat diffusion device which suppresses a decrease in thermal conductivity and has a large maximum heat transfer amount. The present utility model also provides an electronic device including the heat spreader.

The heat diffusion device of the present utility model comprises: a housing having a 1 st inner wall surface and a 2 nd inner wall surface facing each other in a thickness direction; the working medium is used as a working medium, which is enclosed in the inner space of the housing; and a core portion disposed in an inner space of the case, wherein the case has an evaporation portion that evaporates the working medium, the core portion includes a plurality of core bodies that extend from the evaporation portion in a linear shape and that are at least partially in contact with the 2 nd inner wall surface or in contact with both the 1 st inner wall surface and the 2 nd inner wall surface, a vapor flow path is formed between at least 1 group of adjacent core bodies, a 1 st liquid flow path is formed in the adjacent core bodies at least in a space enclosed by a portion of each of the core bodies and a portion of the case, and a 2 nd liquid flow path including a portion extending along the core bodies is formed in a space recessed so that a portion of the core body is separated from the 2 nd inner wall surface between a surface in contact with the 2 nd inner wall surface and the 2 nd inner wall surface.

The adjacent cores may include a 1 st porous body and a 2 nd porous body, respectively, the 1 st liquid flow path may be formed in a space surrounded by a part of the 1 st porous body, a part of the 2 nd porous body, and a part of the case, and the 2 nd liquid flow path may be formed in at least one of a surface of the 1 st porous body in contact with the 2 nd inner wall surface and a surface of the 2 nd porous body in contact with the 2 nd inner wall surface.

In a cross section perpendicular to the direction in which the core extends, the width of the 2 nd liquid flow path may be smaller than the width of the 1 st porous body and the width of the 2 nd porous body, and the height of the liquid flow path may be smaller than 1/2 of the height of the 1 st porous body and 1/2 of the height of the 2 nd porous body.

In a cross section perpendicular to the direction in which the core extends, the width of the 1 st porous body and the width of the 2 nd porous body may be 50 μm or more and 300 μm or less, respectively.

In a cross section perpendicular to the direction in which the core extends, the height of the 1 st porous body and the height of the 2 nd porous body may be 20 μm or more and 300 μm or less, respectively.

In a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may have respective widths in the thickness direction that are not constant.

In a cross section perpendicular to the direction in which the core extends, the width of the end portion of each of the 1 st porous body and the 2 nd porous body on the 2 nd inner wall surface side may be smaller than the width of the end portion on the 1 st inner wall surface side.

In a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may each continuously narrow in width from an end portion on the 1 st inner wall surface side toward an end portion on the 2 nd inner wall surface side.

In a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may be gradually narrowed in width from the end on the 1 st inner wall surface side toward the end on the 2 nd inner wall surface side.

The 1 st porous body and the 2 nd porous body may be connected to each other at an end portion on the 1 st inner wall surface side.

In a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may each have a portion having a width wider than the 1 st inner wall surface side end and the 2 nd inner wall surface side end between the 1 st inner wall surface side end and the 2 nd inner wall surface side end.

In a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may each have a portion having a narrower width between an end portion on the 1 st inner wall surface side and an end portion on the 2 nd inner wall surface side than the end portion on the 1 st inner wall surface side and the end portion on the 2 nd inner wall surface side.

The pore diameters of the 1 st porous body and the 2 nd porous body may be 50 μm or less, respectively.

The vapor passage may further include a plurality of struts, the plurality of struts being disposed in the vapor passage and supporting the 1 st inner wall surface and the 2 nd inner wall surface of the casing from the inside, and the struts may have a height higher than the 1 st porous body and the 2 nd porous body in the thickness direction.

The liquid-jet recording apparatus may further include a support member disposed in the housing along a direction in which the core member extends, wherein the adjacent core members each include a porous member supported by the support member, and wherein the 1 st liquid flow path is formed in a space surrounded by a part of the porous member, a part of the housing, and a part of the support member.

The width of the vapor flow path may be 1000 μm or more and 3000 μm or less, and the width of the 1 st liquid flow path may be 50 μm or more and 500 μm or less in a cross section perpendicular to the direction in which the core extends.

The density of the flow paths at the evaporation portion may be higher than the density of the flow paths at a portion apart from the evaporation portion.

The case may have a plurality of the evaporation units.

The vapor flow passage may further include a plurality of struts, and the plurality of struts may be disposed in the vapor flow passage and may support the 1 st inner wall surface and the 2 nd inner wall surface of the casing from inside.

The ends of the adjacent cores on the evaporation portion side may be connected to each other, and the 1 st liquid flow paths may communicate with each other.

The ends of the adjacent cores on the opposite side to the evaporation portion may be connected to each other, and the 1 st liquid flow paths may communicate with each other.

The plurality of cores may extend along a planar shape of the case as viewed in the thickness direction.

A 3 rd liquid passage extending in the direction in which the wick extends may be formed in the vapor passage, and a width of the 3 rd liquid passage may be smaller than a width of the 1 st liquid passage in a cross section perpendicular to the direction in which the wick extends, and a height of the 3 rd liquid passage may be lower than a height of the 1 st liquid passage in the thickness direction.

The case may be configured by joining an outer edge portion of a 1 st sheet having the 1 st inner wall surface and an outer edge portion of a 2 nd sheet having the 2 nd inner wall surface, wherein the 1 st sheet has a flat plate shape with a constant thickness, and the 2 nd sheet has a shape in which the outer edge portion is thicker than a portion other than the outer edge portion.

The case may be configured by joining an outer edge portion of a 1 st sheet having the 1 st inner wall surface and an outer edge portion of a 2 nd sheet having the 2 nd inner wall surface, wherein the 1 st sheet has a flat plate shape having a constant thickness, and the 2 nd sheet has a shape in which a portion other than the outer edge portion protrudes outward from the outer edge portion.

The heat exchanger may further include at least one of a core portion disposed along the 1 st inner wall surface and a core portion disposed along the 2 nd inner wall surface.

The liquid-filled separator may further include a support body disposed in the housing along a direction in which the core extends, wherein the core includes a porous body supported by the support body, wherein the 1 st liquid flow path is formed in a space surrounded by a part of the porous body, a part of the housing, and the support body, and wherein the 2 nd liquid flow path is disposed on an opposite side of the 1 st liquid flow path with respect to the porous body.

The electronic device of the present utility model is provided with the heat diffusion device of the present utility model.

According to the present utility model, a heat diffusion device can be provided in which the maximum heat transfer amount is large while suppressing a decrease in thermal conductivity.

Drawings

Fig. 1 is a perspective view schematically showing an example of a vapor chamber according to embodiment 1 of the present utility model.

Fig. 2 is a cross-sectional view taken along line II-II of the vapor chamber shown in fig. 1.

Fig. 3 is a cross-sectional view taken along line III-III of the soaking plate shown in fig. 1.

Fig. 4 is an enlarged cross-sectional view of a portion shown in IV in fig. 3.

Fig. 5 is a cross-sectional view schematically showing a 1 st modification of the position where the 2 nd liquid flow path is formed.

Fig. 6 is a cross-sectional view schematically showing a modification 2 of the position where the 2 nd liquid flow path is formed.

Fig. 7 is a cross-sectional view schematically showing a modification of the cross-sectional shape of the 2 nd liquid flow path.

Fig. 8 is a cross-sectional view schematically showing an example of the vapor chamber according to embodiment 2 of the present utility model.

Fig. 9 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 3 of the present utility model.

Fig. 10 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 4 of the present utility model.

Fig. 11 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 5 of the present utility model.

Fig. 12 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 6 of the present utility model.

Fig. 13 is a plan view schematically showing an example of a vapor chamber according to embodiment 7 of the present utility model.

Fig. 14 is a plan view schematically showing an example of a vapor chamber according to embodiment 8 of the present utility model.

Fig. 15 is a plan view schematically showing an example of a vapor chamber according to embodiment 9 of the present utility model.

Fig. 16 is a plan view schematically showing an example of the vapor chamber according to embodiment 10 of the present utility model.

FIG. 17 is a schematic representation of the 11 th embodiment of the present utility model a plan view of an example of the vapor chamber according to the embodiment.

Fig. 18 is a cross-sectional view schematically showing an example of the vapor chamber according to embodiment 11 of the present utility model.

Fig. 19 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 12 of the present utility model.

Fig. 20 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 13 of the present utility model.

Fig. 21 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 14 of the present utility model.

Fig. 22 is a cross-sectional view schematically showing an example of the vapor chamber according to embodiment 15 of the present utility model.

Fig. 23 is a cross-sectional view schematically showing another example of the vapor chamber according to embodiment 15 of the present utility model.

Fig. 24 is a plan view schematically showing an example of a vapor chamber according to embodiment 16 of the present utility model.

Fig. 25 is a plan view schematically showing an example of a vapor chamber according to embodiment 17 of the present utility model.

Fig. 26 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 18 of the present utility model.

Fig. 27 is an enlarged cross-sectional view of a portion shown in XXVII in fig. 26.

Detailed Description

The heat diffusion device of the present utility model will be described below.

However, the present utility model is not limited to the following configuration, and can be appropriately modified and applied within a range not changing the gist of the present utility model. In addition, in the case of the optical fiber, the present utility model also provides a structure in which two or more preferred structures of the present utility model described below are combined.

The embodiments described below are examples, and it is needless to say that the substitution or combination of the portions of the structures described in the different embodiments can be performed. In embodiment 2 and below, description of matters common to embodiment 1 will be omitted, and only differences will be described. In particular, the same operational effects based on the same structure are not mentioned in order according to each embodiment.

In the following description, the present utility model will be described merely as "a heat diffusion device of the present utility model" unless otherwise specified.

Hereinafter, a vapor chamber will be described as an example of an embodiment of the heat spreader of the present utility model. The heat diffusion device of the present utility model can be applied to a heat diffusion device such as a heat pipe.

The drawings shown below are schematic, and there are cases where the dimensions, the scale of the aspect ratio, and the like are different from the actual products.

[ embodiment 1 ]

Fig. 1 is a perspective view schematically showing an example of a vapor chamber according to embodiment 1 of the present utility model. Fig. 2 is a cross-sectional view taken along line II-II of the vapor chamber shown in fig. 1. Fig. 3 is a cross-sectional view taken along line III-III of the soaking plate shown in fig. 1.

The vapor chamber 1 shown in fig. 1 includes a hollow casing 10 sealed in an airtight state. As shown in fig. 3, the case 10 has a 1 st inner wall surface 11a and a 2 nd inner wall surface 12a facing each other in the thickness direction Z. As shown in fig. 2 and 3, the vapor chamber 1 further includes a working medium 20 enclosed in the internal space of the casing 10 and a core 30 disposed in the internal space of the casing 10.

As shown in fig. 2, an evaporation unit (evaporation portion) EP for evaporating the sealed working medium 20 is provided in the casing 10. The case 10 may further be provided with a condensing portion (condensation portion) CP for condensing the evaporated working medium 20. As shown in fig. 1, a heat source HS as a heat generating element is disposed on the outer wall surface of the case 10. Examples of the heat source HS include electronic components of electronic devices, such as a Central Processing Unit (CPU). The portion in the vicinity of the heat source HS in the internal space of the case 10 heated by the heat source HS corresponds to the evaporation unit EP. On the other hand, the portion away from the evaporation portion EP corresponds to the condensation portion CP. The evaporated working medium 20 can be condensed in a portion other than the condensation portion CP. In the present embodiment, a portion that is particularly easy to condense the evaporated working medium 20 is expressed as a condensation portion CP.

The vapor chamber 1 has a planar shape as a whole. That is, the housing 10 is planar as a whole. Here, "planar" includes a plate shape and a sheet shape, and refers to a shape in which the width direction X (hereinafter, referred to as a width) and the length direction Y (hereinafter, referred to as a length) are considerably larger than the thickness direction Z (hereinafter, referred to as a thickness or a height), for example, the width and the length are 10 times or more, preferably 100 times or more, the thickness.

The size of the vapor chamber 1, that is, the size of the casing 10 is not particularly limited. The width and length of the vapor chamber 1 can be appropriately set according to the application. The width and length of the vapor chamber 1 are, for example, 5mm to 500mm, 20mm to 300mm, or 50mm to 200 mm. The width and length of the vapor chamber 1 may be the same or different.

The case 10 is preferably constituted by a 1 st sheet 11 and a 2 nd sheet 12 which are opposed to each other with the outer edge portions joined together. The material constituting the 1 st sheet 11 and the 2 nd sheet 12 is not particularly limited as long as it has characteristics suitable for use as a vapor chamber, such as thermal conductivity, strength, softness, flexibility, and the like. The material constituting the 1 st sheet 11 and the 2 nd sheet 12 is preferably a metal, for example, copper, nickel, aluminum, magnesium, titanium, iron, an alloy containing these as a main component, or the like, and particularly preferably copper. The materials constituting the 1 st sheet 11 and the 2 nd sheet 12 may be the same or different, but are preferably the same.

The 1 st sheet 11 and the 2 nd sheet 12 are joined to each other at their outer edge portions. The bonding method is not particularly limited, but, for example, laser welding, resistance welding, diffusion bonding, brazing, TIG welding (tungsten-inert gas welding), ultrasonic bonding, or resin sealing can be used, and laser welding, resistance welding, or brazing is preferably used.

The thickness of the 1 st sheet 11 and the 2 nd sheet 12 is not particularly limited, but is preferably 10 μm or more and 200 μm or less, more preferably 30 μm or more and 100 μm or less, and still more preferably 40 μm or more and 60 μm or less, respectively. The thicknesses of the 1 st sheet 11 and the 2 nd sheet 12 may be the same or different. The thickness of each of the 1 st sheet 11 and the 2 nd sheet 12 may be the same throughout the whole, or may be locally thin.

The shapes of the 1 st sheet 11 and the 2 nd sheet 12 are not particularly limited. For example, in the example shown in fig. 3, the 1 st sheet 11 has a flat plate shape with a constant thickness, and the 2 nd sheet 12 has a shape with an outer edge portion thicker than a portion other than the outer edge portion.

The thickness of the entire vapor deposition plate 1 is not particularly limited, but is preferably 50 μm or more and 500 μm or less.

The working medium 20 is not particularly limited as long as it can generate a gas-liquid phase change in the environment inside the casing 10, and for example, water, alcohols, freon substitutes, and the like can be used. For example, the working medium is an aqueous compound, preferably water.

The core 30 includes a plurality of cores 40 extending in a linear shape from the evaporation portion EP. For example, the core 40 extends from the evaporation portion EP to the condensation portion CP. At least a part of the core 40 is in contact with at least one of the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a of the housing 10. In the present embodiment, the core 40 supports the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a of the casing 10 from the inside. By disposing the core 30 including the plurality of cores 40 in the inner space of the housing 10, the mechanical strength of the housing 10 can be ensured, and the impact from the outside of the housing 10 can be absorbed.

In the example shown in fig. 3, the core 40 constituting the core 30 is in contact with the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a. The core 40 may be in contact with either the 1 st inner wall surface 11a or the 2 nd inner wall surface 12a.

In the present embodiment, at least 1 set of adjacent cores 40 includes the 1 st porous body 41 and the 2 nd porous body 42, respectively. These porous bodies function as cores for transporting the working medium 20 by capillary force. Further, by using the porous body as a support body for the casing 10, the weight reduction of the vapor chamber 1 can be achieved.

The 1 st porous body 41 and the 2 nd porous body 42 are constituted of, for example, a metal porous body, a ceramic porous body, or a resin porous body. The 1 st porous body 41 and the 2 nd porous body 42 may be made of, for example, a sintered body such as a metal porous sintered body or a ceramic porous sintered body. The 1 st porous body 41 and the 2 nd porous body 42 are preferably made of porous sintered bodies of copper or nickel.

A vapor flow path 50 through which the gas-phase working medium 20 flows is formed between at least 1 group of adjacent cores 40.

On the other hand, the 1 st liquid flow path 51 is formed at least in a space surrounded by a part of each core 40 and a part of the housing 10. In the present embodiment, the 1 st liquid flow path 51 is formed in a space surrounded by a part of the 1 st porous body 41, a part of the 2 nd porous body 42, and a part of the casing 10. Specifically, in each core 40, a 1 st liquid flow path 51 is formed by providing a space between the 1 st porous body 41 and the 2 nd porous body 42 along the direction in which the core 40 extends. The 1 st liquid flow path 51 can be used as a liquid flow path through which the liquid-phase working medium 20 flows. By alternately disposing the liquid flow path and the vapor flow path through the core 40, for example, through the 1 st porous body 41 or the 2 nd porous body 42, the heat transfer efficiency can be improved.

As shown in fig. 3, the width a of the vapor flow path 50 is larger than the width b of the 1 st liquid flow path 51. The width a of the vapor flow path 50 is preferably 1000 μm or more and 3000 μm or less, more preferably 1000 μm or more and 2000 μm or less. The width b of the 1 st liquid flow path 51 is preferably 50 μm or more and 500 μm or less. In the cross section, when the widths of the vapor flow paths in the thickness direction Z are different, the width of the widest portion is defined as the width of the vapor flow path. Similarly, in the case where the width of the 1 st liquid flow path in the thickness direction Z is different, the width of the widest portion is defined as the width of the 1 st liquid flow path.

Fig. 4 is an enlarged cross-sectional view of a portion shown in IV in fig. 3.

As shown in fig. 3 and 4, the 2 nd liquid flow path 52 is formed by providing a groove portion in at least one of the surfaces of the core 40 in contact with the 1 st inner wall surface 11a or the 2 nd inner wall surface 12a along the direction in which the core 40 extends. In the present embodiment, the 2 nd liquid flow path 52 is formed on at least one of the surface of the 1 st porous body 41 in contact with the 1 st inner wall surface 11a, the surface of the 1 st porous body 41 in contact with the 2 nd inner wall surface 12a, the surface of the 2 nd porous body 42 in contact with the 1 st inner wall surface 11a, and the surface of the 2 nd porous body 42 in contact with the 2 nd inner wall surface 12 a. Specifically, the 2 nd liquid flow path 52 is formed by providing a groove in the direction in which the core 40 extends on the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a and the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12 a. Like the 1 st liquid flow path 51, the 2 nd liquid flow path 52 can be used as a liquid flow path through which the working medium 20 in the liquid phase flows.

The surface of the 1 st porous body 41 or the 2 nd porous body 42, which is in contact with the 1 st inner wall surface 11a or the 2 nd inner wall surface 12a, for example, the surface of the 2 nd liquid flow path 52 facing the 2 nd inner wall surface 12a of the case 10, can maintain the height of the vapor flow path and increase the liquid flow path. Therefore, the maximum heat transfer amount can be increased while suppressing a decrease in thermal conductivity. In addition, by forming the flow path on the top surface or the bottom surface of the porous body, the flow of the liquid to the heat source can be performed more smoothly than by forming the flow path in the inside (central portion) of the porous body.

The method of forming the 2 nd liquid flow path 52 is not particularly limited, but, for example, in the case where the 1 st porous body 41 and the 2 nd porous body are constituted by porous sintered bodies, there are a method of adjusting the viscosity of paste used for producing the porous sintered bodies, a method of applying the paste by printing such as screen printing, and then pressing the paste.

In FIG. 4, the width e of the 2 nd liquid flow path 52 is preferably larger than the width c of the 1 st porous body 41 ₁ And width c of the 2 nd porous body 42 ₂ Is smaller and the height f of the 2 nd liquid flow path 52 is smaller than the height d of the 1 st porous body 41 ₁ 1/2 and height d of the 2 nd porous body 42 ₂ Is small 1/2. That is, preferably e < c ₁ And e < c ₂ And f < 1/2d ₁ And f < 1/2d ₂ Is established. In addition, in the above-mentioned cross section, in the case where the width of the 2 nd liquid flow path in the thickness direction Z is different, the width of the widest portion is defined as the width of the 2 nd liquid flow path. Similarly, in the case where the widths of the porous bodies in the thickness direction Z are different, the width of the widest portion is defined as the width of the porous body. In the cross section, when the height of the 2 nd liquid flow path is different in the width direction X, the height of the highest portion is defined as the height of the 2 nd liquid flow path. Also, in the case where the heights of the porous bodies in the width direction X are different, the height of the highest portion is defined as the height of the porous body.

As described above, the width e of the 2 nd liquid flow path 52 is preferably larger than the width c of the 1 st porous body 41 ₁ And width c of the 2 nd porous body 42 ₂ Are smaller, but may be equal to the width c of the 1 st porous body 41 ₁ And width c of the 2 nd porous body 42 ₂ At least one of which is the same.

Width c of 1 st porous body 41 ₁ And width c of the 2 nd porous body 42 ₂ Preferably 50 μm or more and 300 μm or less, respectively. Thus, a high capillary force can be obtained. Width c of 1 st porous body 41 ₁ Width c of the 2 nd porous body 42 ₂ May be the same or different. As described below in embodiment 2, the 1 st porous body 41 has a width c ₁ And width c of the 2 nd porous body 42 ₂ It may not be constant in the thickness direction Z. The porous body having a constant width in the thickness direction Z may be mixed with the porous body having a non-constant width in the thickness direction Z.

Height d of 1 st porous body 41 ₁ And height d of the 2 nd porous body 42 ₂ Preferably 20 μm or more and 300 μm or less, more preferably 50 μm or more and 300 μm or less, respectively. Height d of 1 st porous body ₁ And height d of the 2 nd porous body 42 ₂ In the above range, even when the soaking plate 1 is made thinner as a whole, the mechanical strength and the maximum heat transfer amount can be ensured by disposing the 1 st porous body 41 and the 2 nd porous body 42 in the case 10 as described above. Height d of 1 st porous body 41 ₁ Height d from the 2 nd porous body 42 ₂ May be the same or different.

In fig. 4, the 2 nd liquid flow path 52 is formed on both the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a and the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12a, but the 2 nd liquid flow path 52 may be formed only on either one of the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a and the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12 a.

As shown in fig. 5, the 2 nd liquid flow path 52 may be formed on the 1 st porous body 41, the surface facing the 1 st inner wall surface 11a, and the 2 nd porous body 42, the surface facing the 1 st inner wall surface 11 a.

In fig. 5, the 2 nd liquid flow path 52 is formed on both the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11a, but the 2 nd liquid flow path 52 may be formed only on either one of the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11 a.

As shown in fig. 6, the 2 nd liquid flow path 52 may be formed on the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a, the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12a, the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a, and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11 a.

In fig. 6, the 2 nd liquid flow path 52 is formed on all of the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a, the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12a, the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a, and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11a, but the 2 nd liquid flow path 52 may be formed on at least one surface.

When the 2 nd liquid flow path 52 is formed on two or more of the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a, the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12a, the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a, and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11a, the cross-sectional shapes of the 2 nd liquid flow paths 52 formed on the respective surfaces may be the same or different. The width e of the 2 nd liquid flow path 52 formed on each surface may be the same or different. Similarly, the height f of the 2 nd liquid flow path 52 formed on each surface may be the same or different.

When the 2 nd liquid flow path 52 is formed on two or more of the surface of the 1 st porous body 41 facing the 2 nd inner wall surface 12a, the surface of the 2 nd porous body 42 facing the 2 nd inner wall surface 12a, the surface of the 1 st porous body 41 facing the 1 st inner wall surface 11a, and the surface of the 2 nd porous body 42 facing the 1 st inner wall surface 11a, the positions of the 2 nd liquid flow paths 52 formed on the respective surfaces may be the same or different.

In the case where the core 40 includes the 1 st porous body 41 and the 2 nd porous body 42, the core 40 in which the 2 nd liquid flow path 52 is not formed may be included.

Fig. 4 to 6 show an example of the 2 nd liquid flow path 52 having a quadrangular cross-sectional shape, but the cross-sectional shape of the 2 nd liquid flow path 52 is not particularly limited.

As shown in fig. 7, the 2 nd liquid flow path 52A having a curved cross-sectional shape may be formed.

Next, the operation of the soaking plate 1 configured as described above will be described.

In the evaporation unit EP, the liquid-phase working medium 20 located on the surfaces of the 1 st porous body 41 and the 2 nd porous body 42 is heated and evaporated via the inner wall surface of the casing 10. The working medium 20 evaporates, so that the pressure of the gas in the vapor flow path 50 in the vicinity of the evaporation unit EP increases. Thereby, the vapor-phase working medium 20 moves toward the condensation portion CP side in the vapor flow path 50.

The gas-phase working medium 20 reaching the condensation portion CP is condensed by taking heat away from the inner wall surface of the casing 10, and becomes droplets. As described above, the gas-phase working medium 20 can be condensed in a portion other than the condensation portion CP. The droplets of the working medium 20 are immersed in the pores of the 1 st porous body 41 and the pores of the 2 nd porous body 42 by capillary force. Further, a part of the liquid-phase working medium 20 that has entered the pores of the 1 st porous body 41 and the pores of the 2 nd porous body 42 flows into the 1 st liquid flow path 51 and the 2 nd liquid flow path 52. Accordingly, the 1 st porous body 41, the 2 nd porous body 42, the 1 st liquid flow path 51, and the 2 nd liquid flow path 52 form a liquid flow path.

The liquid-phase working medium 20 in the pores of the 1 st porous body 41, the 2 nd porous body 42, the 1 st liquid flow path 51, and the 2 nd liquid flow path 52 moves toward the evaporation unit EP by capillary force. The liquid-phase working medium 20 is supplied to the evaporation unit EP from the pores of the 1 st porous body 41, the pores of the 2 nd porous body 42, the 1 st liquid flow path 51, and the 2 nd liquid flow path 52. The liquid-phase working medium 20 reaching the evaporation unit EP evaporates again from the surfaces of the 1 st porous body 41 and the 2 nd porous body 42 in the evaporation unit EP. As shown in fig. 2, the 1 st liquid flow path 51 preferably reaches the evaporation unit EP. The evaporation unit EP may include the 1 st liquid passage 51 and the wick 40, may include only the wick 40 without including the 1 st liquid passage 51, and may include no 1 st liquid passage 51 and no wick 40.

The vapor-phase working medium 20 evaporated to be in the vapor phase passes through the vapor flow path 50 again and moves toward the condensation portion CP. In this way, the soaking plate 1 can repeatedly transport the heat recovered at the evaporation unit EP side to the condensation unit CP side by repeatedly utilizing the gas-liquid phase change of the working medium 20.

The pore diameters of the 1 st porous body 41 and the 2 nd porous body 42 are preferably 50 μm or less, respectively. By making the pore diameter smaller, a higher capillary force can be obtained. The pore diameters of the 1 st porous body 41 and the 2 nd porous body 42 may be the same or different. In addition, in the case of the optical fiber, the shape of the hole is not particularly limited.

As shown in fig. 2, at least 1 group of adjacent cores 40 may be connected to each other at the end on the evaporation portion EP side, and the 1 st liquid flow paths 51 may communicate with each other. In addition, at least 1 group of adjacent cores 40 may be connected to each other at the end opposite to the evaporation portion EP, for example, at the end on the condensation portion CP side, and the 1 st liquid flow paths 51 may communicate with each other.

As described above, in the soaking plate 1, the liquid flow path and the vapor flow path are formed between the cores 40. Among these, as shown in fig. 2, it is preferable that the density of the flow paths at the evaporation portion EP is higher than the density of the flow paths at a portion away from the evaporation portion EP, for example, the density of the flow paths at the condensation portion CP. This can improve the maximum heat transfer amount.

In the soaking plate of the present utility model, the 1 st porous body and the 2 nd porous body may have a constant width in the thickness direction or a non-constant width in the thickness direction in a cross section perpendicular to the direction in which the core extends. For example, in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body may each have a narrower width at the end on the 2 nd inner wall surface side than at the end on the 1 st inner wall surface side. In this case, a portion having a constant width may be included.

[ embodiment 2 ]

In embodiment 2 of the present utility model, in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body each have a width that continuously narrows from the end on the 1 st inner wall surface side toward the end on the 2 nd inner wall surface side.

In the soaking plate 1A shown in fig. 8, the adjacent cores 40 include a 1 st porous body 41A and a 2 nd porous body 42A, respectively. The width of the end portion of each of the 1 st porous body 41A and the 2 nd porous body 42A on the 2 nd inner wall surface 12A side is narrower than the width of the end portion on the 1 st inner wall surface 11A side. The 1 st porous body 41A and the 2 nd porous body 42A continuously narrow in width from the end portion on the 1 st inner wall surface 11A side toward the end portion on the 2 nd inner wall surface 12A side. In the example shown in fig. 8, the cross-sectional shapes of the 1 st porous body 41A and the 2 nd porous body 42A are each trapezoidal. The cross-sectional shapes of the 1 st porous body 41A and the 2 nd porous body 42A are not particularly limited, and may be other shapes.

In the vapor deposition plate 1A shown in fig. 8, the 1 st porous body 41A and the 2 nd porous body 42A have the above-described cross-sectional shapes, so that the pressure from the outside of the casing 10 can be dispersed. Further, since it is easy to maintain the internal space of the case 10 in a minimum area and to secure the sectional areas of the vapor flow path and the liquid flow path to the maximum, the maximum heat transfer amount and the heat diffusion capability can be improved. Further, since the liquid flow path is formed in the small-area gap at the acute angle formed between the end portion on the side of the 2 nd inner wall surface 12a and the casing 10, the liquid-phase working medium 20 is easily introduced into the liquid flow path between the cores 40, and the maximum heat transport capacity is improved. Alternatively, the leakage of the liquid-phase working medium 20 into the vapor flow path is improved, and the heat diffusion capability is improved.

[ embodiment 3 ]

In embodiment 3 of the present utility model, in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body each gradually narrow in width from the end on the 1 st inner wall surface side toward the end on the 2 nd inner wall surface side.

In the soaking plate 1B shown in fig. 9, the adjacent cores 40 include a 1 st porous body 41B and a 2 nd porous body 42B, respectively. The width of the end portion of each of the 1 st porous body 41B and the 2 nd porous body 42B on the 2 nd inner wall surface 12a side is narrower than the width of the end portion on the 1 st inner wall surface 11a side. The 1 st porous body 41B and the 2 nd porous body 42B are each narrowed in width stepwise from the end portion on the 1 st inner wall surface 11a side toward the end portion on the 2 nd inner wall surface 12a side. In the example shown in fig. 9, the cross-sectional shapes of the 1 st porous body 41B and the 2 nd porous body 42B are each a combination of a 1 st rectangle arranged on the 1 st inner wall surface 11a side and a 2 nd rectangle arranged on the 2 nd inner wall surface 12a side and having a narrower width than the 1 st rectangle. The cross-sectional shapes of the 1 st porous body 41B and the 2 nd porous body 42B are not particularly limited, and may be other shapes.

In the vapor chamber 1B shown in fig. 9, the 1 st porous body 41B and the 2 nd porous body 42B have the above-described cross-sectional shape, and the same effects as those of the vapor chamber 1A shown in fig. 8 are obtained.

[ embodiment 4 ]

Embodiment 4 of the present utility model is a modification of embodiment 2 and embodiment 3. In embodiment 4 of the present utility model, the 1 st porous body and the 2 nd porous body are connected to each other at the end on the 1 st inner wall surface side. If the ends of the porous body on the 1 st inner wall surface side are connected to each other, the contact area between the porous body and the 1 st inner wall surface increases, and the adhesive strength increases, so that the resistance to mechanical stress such as bending or vibration can be improved.

In the soaking plate 1C shown in fig. 10, the adjacent cores 40 include a 1 st porous body 41C and a 2 nd porous body 42C, respectively. The width of the end portion of each of the 1 st porous body 41C and the 2 nd porous body 42C on the 2 nd inner wall surface 12a side is narrower than the width of the end portion on the 1 st inner wall surface 11a side. The cross-sectional shapes of the 1 st porous body 41C and the 2 nd porous body 42C are not particularly limited.

The 1 st porous body 41C and the 2 nd porous body 42C are connected to each other at the 1 st inner wall surface 11a side end.

[ embodiment 5 ]

In embodiment 5 of the present utility model, in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body have a portion wider between the end on the 1 st inner wall surface side and the end on the 2 nd inner wall surface side than the widths of the end on the 1 st inner wall surface side and the end on the 2 nd inner wall surface side, respectively.

In the soaking plate 1D shown in fig. 11, the adjacent cores 40 include a 1 st porous body 41D and a 2 nd porous body 42D, respectively. The 1 st porous body 41D and the 2 nd porous body 42D each have a portion wider than the width of the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side between the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side.

In the vapor chamber 1D shown in fig. 11, the 1 st porous body 41D and the 2 nd porous body 42D have the above-described cross-sectional shape, so that the same effect as in the vapor chamber 1A shown in fig. 8 is obtained.

In the 1 st porous body 41D and the 2 nd porous body 42D, the width of the end portion on the 1 st inner wall surface 11a side and the width of the end portion on the 2 nd inner wall surface 12a side may be the same or different.

In the 1 st porous body 41D and the 2 nd porous body 42D, positions where the width is wider than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side exist are not particularly limited. Further, two or more portions may be present at a portion wider than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side. In this case, the width of the portion wider than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side may be the same or different.

1 st porous body 41D and 2 nd porous body 42 the cross-sectional shape of D is not particularly limited. The width of the 1 st porous body 41D and the 2 nd porous body 42D may also be continuously changed, or may be varied in stages.

[ embodiment 6 ]

In embodiment 6 of the present utility model, in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body have a portion having a narrower width between the end on the 1 st inner wall surface side and the end on the 2 nd inner wall surface side than the end on the 1 st inner wall surface side and the end on the 2 nd inner wall surface side, respectively.

In the soaking plate 1E shown in fig. 12, the adjacent cores 40 include a 1 st porous body 41E and a 2 nd porous body 42E, respectively. The 1 st porous body 41E and the 2 nd porous body 42E each have a portion having a narrower width between the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side.

In the soaking plate 1E shown in fig. 12, the 1 st porous body 41E and the 2 nd porous body 42E have the above-described cross-sectional shape, so that the pressure from the outside of the casing 10 can be dispersed. Further, on the one hand, the liquid-phase working medium 20 is easily absorbed by the wide portion, and on the other hand, evaporation of the working medium 20 is easily promoted by the narrow portion. As a result thereof, the maximum heat transport capacity is improved.

In the 1 st porous body 41E and the 2 nd porous body 42E, the width of the end portion on the 1 st inner wall surface 11a side and the width of the end portion on the 2 nd inner wall surface 12a side may be the same or different.

In the 1 st porous body 41E and the 2 nd porous body 42E, positions where the width is narrower than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side exist are not particularly limited. Further, two or more portions may be present at a portion having a width narrower than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side. In this case, the width of the portion narrower than the end portion on the 1 st inner wall surface 11a side and the end portion on the 2 nd inner wall surface 12a side may be the same or different.

1 st porous body 41E and 2 nd porous body 42 the cross-sectional shape of E is not particularly limited. The widths of the 1 st porous body 41E and the 2 nd porous body 42E may be continuously changed or may be changed stepwise.

In the vapor deposition plate of the present utility model, the shapes of the porous bodies described in embodiment nos. 1 to 6 may be combined by 2 or more kinds.

[ embodiment 7 ]

In the vapor chamber 1F shown in fig. 13, unlike the vapor chamber 1 shown in fig. 2, the ends of the adjacent cores 40 on the opposite side to the evaporation portion EP are not connected to each other, for example, the ends on the condensation portion CP side, and the 1 st liquid flow paths 51 are not connected to each other. As described in embodiment 1 to embodiment 6 the shape is other than the 1 st porous body 41 and the 2 nd porous body 42.

[ embodiment 8 ]

In embodiment 8 of the present utility model, the case has a plurality of evaporation portions.

In the vapor chamber 1G shown in fig. 14, a plurality of evaporation units EP1, EP2 are provided in the case 10. As shown in fig. 14, the density of the flow paths in each of the evaporation units EP1 and EP2 is preferably higher than the density of the flow paths in the portions separating the evaporation units EP1 and EP2, for example, the density of the flow paths in the condensation unit CP. The number, arrangement and size of the evaporation units are not particularly limited. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

[ embodiment 9 ]

In embodiment 9 of the present utility model, the planar shape of the case as viewed in the thickness direction is different from those in embodiments 1 to 8.

In the soaking plate 1H shown in fig. 15, the planar shape of the casing 10A is L-shaped. The plurality of cores 40 extend along the planar shape of the housing 10A. Accordingly, a vapor flow path and a liquid flow path along the planar shape of the case 10A are formed. As an example, the adjacent cores 40 include a 1 st porous body 41 and a 2 nd porous body 42, respectively. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1 and embodiment 2.

In the soaking plate of the present utility model, the planar shape of the case as viewed in the thickness direction is not particularly limited, and examples thereof include polygonal shapes such as triangular or rectangular shapes, circular shapes, elliptical shapes, and combinations thereof. The planar shape of the case may be L-shaped, C-shaped (コ -shaped), or the like. Further, a through hole may be provided in the housing. The planar shape of the housing may be a shape corresponding to the use of the soaking plate, the shape of the mounting portion of the soaking plate, and other members existing in the vicinity.

[ embodiment 10 ]

Unlike the vapor chamber 1 shown in fig. 2, the vapor chamber 1I shown in fig. 16 includes a core 40 extending in a direction inclined with respect to the width direction X and the length direction Y.

As in the soaking plate 1I shown in fig. 16, the core 30 may include a core 40 extending radially from the evaporation portion EP. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

[ embodiment 11 ]

In embodiment 11 of the present utility model, a plurality of struts are disposed in the vapor flow path so as to support the 1 st inner wall surface and the 2 nd inner wall surface of the casing from the inside.

Fig. 17 is a plan view schematically showing an example of a vapor chamber according to embodiment 11 of the present utility model. Fig. 18 is a cross-sectional view schematically showing an example of the vapor chamber according to embodiment 11 of the present utility model.

In the vapor chamber 1J shown in fig. 17 and 18, unlike the vapor chamber 1A shown in fig. 8, a plurality of struts 60 are arranged in the vapor flow path 50. Between the struts 60, the vapor flow path 50 is open. The strut 60 supports the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a of the housing 10 from the inside. When the number of the 1 st liquid flow paths 51 is small, the housing 10 can be supported by disposing the struts 60 in the vapor flow path 50. As described in embodiment 1 to embodiment 6, the porous bodies 41A and 42A may be formed in shapes other than those of the 1 st porous body 41A and the 2 nd porous body 42A.

As shown in fig. 17 and 18, the struts 60 are preferably arranged in all the vapor flow passages 50, but there may be vapor flow passages 50 in which no struts 60 are arranged.

In the example shown in fig. 18, the pillar 60 is in contact with the 1 st inner wall surface 11a and the 2 nd inner wall surface 12 a. The pillar 60 may be in contact with either the 1 st inner wall surface 11a or the 2 nd inner wall surface 12a, or may not be in contact with either the 1 st inner wall surface 11a or the 2 nd inner wall surface 12 a.

The material forming the support post 60 is not particularly limited, but examples thereof include a resin, a metal, a ceramic, a mixture thereof, a laminate thereof, and the like. The stay 60 may be formed integrally with the case 10, for example, by etching the inner wall surface of the 1 st sheet 11 or the 2 nd sheet 12.

The shape of the support column 60 is not particularly limited as long as it can support the housing 10, but examples of the shape of the cross section perpendicular to the height direction of the support column 60 include a polygonal shape such as a rectangle, a circle, an oval shape, and the like.

The height of the stay 60 is not particularly limited, and may be the same as or different from the height of the core 40.

The heights of the struts 60 may be the same or different in one soaking plate. For example, the height of the pillars 60 in one region may be different from the heights of the pillars 60 in other regions.

In the cross section shown in fig. 18, the width of the strut 60 is not particularly limited as long as strength capable of suppressing deformation of the casing of the vapor chamber is imparted thereto, but the equivalent circular diameter of the cross section perpendicular to the height direction of the end portion of the strut 60 is, for example, 100 μm or more and 2000 μm or less, and preferably 300 μm or more and 1000 μm or less. By increasing the equivalent circular diameter of the strut 60, deformation of the casing of the vapor chamber can be more suppressed. On the other hand, by reducing the equivalent circular diameter of the strut 60, a space for the vapor movement of the working medium can be ensured more.

The arrangement of the struts 60 is not particularly limited, but is preferably arranged uniformly in a predetermined region, and more preferably uniformly throughout the entire region, for example, the struts 60 are arranged such that the distance between the struts is constant. By uniformly disposing the struts 60, uniform strength can be ensured throughout the entire soaking plate.

[ embodiment 12 ]

Embodiment 12 of the present utility model is a modification of embodiment 11 of the present utility model. In embodiment 12 of the present utility model, the height of the stay is greater than the height of the core in the thickness direction.

In the vapor chamber 1K shown in fig. 19, unlike the vapor chamber 1J shown in fig. 18, the height of the pillar 60 is higher than the height of the 1 st porous body 41A and higher than the height of the 2 nd porous body 42A in the thickness direction Z.

[ 13. Th embodiment mode (S)

In embodiment 13 of the present utility model, a 3 rd liquid flow path extending in the direction in which the core extends is formed in the vapor flow path.

In the vapor chamber 1L shown in fig. 20, unlike the vapor chamber 1 shown in fig. 3, a 3 rd liquid flow path 53 extending in the longitudinal direction Y, which is one example of the direction in which the core 40 extends, is formed in the vapor flow path 50. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

As shown in fig. 20, the width g of the 3 rd liquid flow path 53 is smaller than the width b of the 1 st liquid flow path 51. By making the width g of the 3 rd liquid channel 53 smaller than the width b of the 1 st liquid channel 51, the 3 rd liquid channel 53 can be used as a liquid channel.

In the thickness direction Z, the 3 rd liquid flow path 53 is lower in height than the 1 st liquid flow path 51. By forming the 3 rd liquid passage 53 in the vapor passage 50, even when the 1 st liquid passage 51 and the 2 nd liquid passage 52 as the liquid passages are broken, the operation of the vapor chamber can be ensured. In addition, the resistance to mechanical stress such as bending or vibration can be improved.

The 3 rd liquid flow path 53 may be provided on both the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a, or may be provided only on either the 1 st inner wall surface 11a or the 2 nd inner wall surface 12a. The 3 rd liquid flow path 53 may be formed by a portion protruding from the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a, for example, a columnar portion, or may be formed by a recess, for example, a groove, or the like, in the 1 st inner wall surface 11a and the 2 nd inner wall surface 12a.

In FIG. 20, the width g of the 3 rd liquid flow path 53 is preferably 10 μm or more and 500 μm or less.

In the thickness direction Z, the height of the 3 rd liquid flow path 53 is preferably 10 μm or more and 100 μm or less.

[ embodiment 14 ]

In embodiment 14 of the present utility model, the shape of the case is different.

In the vapor chamber 1M shown in fig. 21, unlike the vapor chamber 1A shown in fig. 8, the case 10B is composed of the 1 st sheet 11B and the 2 nd sheet 12B which are opposed to each other and whose outer edge portions are joined together. The 1 st sheet 11B has a flat plate shape with a constant thickness, and the 2 nd sheet 12B has a shape with a constant thickness and a portion other than the outer edge portion protruding outward with respect to the outer edge portion. As described in embodiment 1 to embodiment 6, the porous bodies 41A and 42A may be formed in shapes other than those of the 1 st porous body 41A and the 2 nd porous body 42A.

In embodiment 14 of the present utility model, a recess is formed in the outer edge portion of the case. Therefore, the concave portion can be used at the time of mounting the vapor chamber or the like. In addition, other members or the like may be disposed in the concave portion of the outer edge portion.

[ embodiment 15 ]

The soaking plate according to embodiment 15 of the present utility model further comprises a soaking plate formed along the 1 st inner wall surface at least one of the core portions arranged along the 2 nd inner wall surface and the core portion arranged along the 2 nd inner wall surface.

In the vapor chamber 1N shown in fig. 22, unlike the vapor chamber 1 shown in fig. 3, the core 71 is arranged along the 1 st inner wall surface 11a, and the core 72 is arranged along the 2 nd inner wall surface 12 a. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

In the soaking plate 1O shown in fig. 23, the core portion 71 is not arranged along the 1 st inner wall surface 11a, but the core portion 72 is arranged along the 2 nd inner wall surface 12 a. Further, the core portion 72 may not be disposed along the 2 nd inner wall surface 12a, but the core portion 71 may be disposed along the 1 st inner wall surface 11 a.

The core portions 71 and 72 are not particularly limited as long as they have a capillary structure capable of moving the working medium by capillary force. The capillary structure of the core can also be the existing is a known structure used for a soaking plate. As a construction of the capillary tube, examples of the fine structures include pores, grooves, protrusions, and the like having irregularities, such as porous structures, fibrous structures, groove structures, and mesh structures.

The material of the core portions 71, 72 is not particularly limited, and for example, a metal porous film, a mesh, a nonwoven fabric, a sintered body, a porous body, or the like formed by etching or metal processing is used. The mesh of the material to be the core may be composed of, for example, a metal mesh, a resin mesh, or a mesh having a surface coated thereon, and is preferably composed of a copper mesh, a stainless steel (SUS) mesh, or a polyester mesh. The sintered body serving as the material of the core may be composed of, for example, a metal porous sintered body or a ceramic porous sintered body, and preferably a porous sintered body of copper or nickel. The porous body serving as the material of the core may be made of, for example, a metal porous body, a ceramic porous body, or a resin porous body.

The size and shape of the core portions 71, 72 are not particularly limited, but for example, it is preferable to have a size and shape that can be continuously provided from the evaporation portion to the condensation portion in the interior of the casing 10.

The thickness of the core portions 71, 72 is not particularly limited, but is, for example, 2 μm or more and 200 μm or less, preferably 5 μm or more and 100 μm or less, more preferably 10 μm or more and 40 μm or less, respectively. The thickness of the cores 71, 72 may also be locally different. The thickness of the core 71 may be the same as or different from the thickness of the core 72.

[ embodiment 16 ]

In the vapor chamber 1P shown in fig. 24, unlike the vapor chamber 1 shown in fig. 2, the core 30 is disposed only on the outer peripheral portion of the casing 10. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

[ embodiment 17 ]

In the vapor chamber 1Q shown in fig. 25, unlike the vapor chamber 1 shown in fig. 2, the core 30 is disposed only in the center of the case 10. As described in embodiment 1 to embodiment 6, the porous bodies 41 and 42 may be other than those described in embodiment 1.

Embodiment 18

In embodiment 18 of the present utility model, the support bodies are arranged in the housing along the direction in which the cores extend, and at least 1 group of adjacent cores each include a porous body supported by the support bodies.

Fig. 26 is a cross-sectional view schematically showing an example of a vapor chamber according to embodiment 18 of the present utility model. FIG. 27 shows the result of XXVII in FIG. 26 is an enlarged partial cross-sectional view of (a).

The soaking plate 1R shown in fig. 26 further includes a support 80 disposed in the housing 10 along the direction in which the core 40 extends. In the example shown in fig. 26 and 27, 2 rows of supports (the 1 st support 81 and the 2 nd support 82) are arranged in parallel to each other along the direction in which the core 40 extends, but 3 or more rows of supports may be arranged in parallel to each other along the direction in which the core 40 extends.

In the present embodiment, at least 1 set of adjacent cores 40 each include a porous body 43 supported by a support 80.

The 1 st liquid flow path 51 is formed in a space surrounded by a part of the porous body 43, a part of the casing 10, and a part of the support body 80. Specifically, the 1 st liquid flow path 51 is formed by providing a space between the 1 st support 81 and the 2 nd support 82 in the direction along which the core 40 extends.

The 2 nd liquid flow path 52 is formed on at least one of the surfaces of the porous body 43 that contact the 1 st inner wall surface 11a or the 2 nd inner wall surface 12 a. Specifically, the 2 nd liquid flow path 52 is formed by providing a groove portion in the surface of the porous body 43 facing the 2 nd inner wall surface 12a in the direction along which the core 40 extends.

In fig. 26 and 27, the support 80 is disposed on the 1 st inner wall surface 11a, and the 2 nd liquid flow path 52 is disposed on the surface of the porous body 43 facing the 2 nd inner wall surface 12a, but the support 80 may be disposed on the 2 nd inner wall surface 12a, and the 2 nd liquid flow path 52 may be disposed on the surface of the porous body 43 facing the 1 st inner wall surface 11 a. Alternatively, they may be mixed.

The porous body 43 is constituted by, for example, a metal porous body, a ceramic porous body, or a resin porous body. The porous body 43 may be made of a sintered body such as a metal porous sintered body or a ceramic porous sintered body. The porous body 43 is preferably made of a porous sintered body of copper or nickel.

The material forming the support 80 is not particularly limited, but examples thereof include resins, metals, ceramics, mixtures thereof, laminates, and the like. In addition, the support 80 may be integral with the housing 10, for example, the inner wall surface of the 1 st sheet 11 or the 2 nd sheet 12 may be formed by etching or the like.

The shape of the support 80 is not particularly limited, and may be constituted by, for example, rail-shaped struts arranged along the direction in which the core 40 extends, or may be constituted by a plurality of struts arranged at intervals along the direction in which the core 40 extends.

The heat spreader of the present utility model can be mounted on an electronic device for heat dissipation. Therefore, an electronic device provided with the heat diffusion device of the present utility model is also one design of the present utility model. Examples of the electronic device of the present utility model include: smart phones, tablet terminals, notebook personal computers, gaming machines, wearable devices, etc. As described above, the heat diffusion device of the present utility model can operate autonomously without external power, and can diffuse heat at a high speed in two dimensions by utilizing the latent heat of evaporation and the latent heat of condensation of the working medium. Therefore, by the electronic device provided with the heat diffusion device of the present utility model, heat dissipation can be effectively realized in a limited space inside the electronic device.

Industrial applicability

The heat diffusion device of the present utility model can be used in a wide variety of applications in the field of portable information terminals and the like. For example, the present utility model can be used for reducing the temperature of a heat source such as a CPU and prolonging the service life of an electronic device, and can be used for a smart phone, a tablet PC, a notebook PC, and the like.

Description of the reference numerals

1. 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 1M, 1N, 1O, 1P, 1Q, 1R. 10. 10A, 10B. 11. Sheet 1; inner wall surface 1; 12. sheet 2; inner wall surface No. 2; working medium; 30. 71, 72. 40. the core; 41. 41A, 41B, 41C, 41D, 41 e..1 st porous body; 42. 42A, 42B, 42C, 42D, 42E. Porous body; vapor flow path; 51. the 1 st liquid flow path; 52. 2 nd liquid flow path; 53. the 3 rd liquid flow path; struts; support body; 81. support 1; 82. support body 2; width of the vapor flow path; width of the first liquid flow path; c ₁ .. the 1 st porous width of the body; c ₂ .. the width of the 2 nd porous body; d, d ₁ .. the height of the 1 st porous body; d, d ₂ .. the height of the 2 nd porous body; width of the 2 nd liquid flow path; height of the 2 nd liquid flow path; width of the 3 rd liquid flow path;cp. condensation section; EP, EP1, EP 2; HS. the heat source; x. widthwise; y. lengthwise; z.

Claims

1. A heat diffusion device, comprising:

a housing having a 1 st inner wall surface and a 2 nd inner wall surface facing each other in a thickness direction;

a working medium enclosed in an inner space of the casing; and

a core portion disposed in an inner space of the housing,

the housing has an evaporation portion that evaporates the working medium,

the core portion includes a plurality of core bodies extending from the evaporation portion in a linear shape and at least partially contacting the 2 nd inner wall surface or contacting both the 1 st inner wall surface and the 2 nd inner wall surface,

a vapor flow path is formed between at least 1 set of adjacent cores,

in the adjacent cores, a 1 st liquid flow path is formed at least in a space surrounded by a part of each core and a part of the housing,

the core body is formed with a 2 nd liquid flow path including a portion along a direction in which the core body extends by forming a space recessed between a surface thereof in contact with the 2 nd inner wall surface and the 2 nd inner wall surface so that a part of the core body is separated from the 2 nd inner wall surface.

2. A heat diffusion device according to claim 1, wherein,

the adjacent cores respectively comprise a 1 st porous body and a 2 nd porous body,

the 1 st liquid flow path is formed in a space surrounded by a part of the 1 st porous body, a part of the 2 nd porous body, and a part of the housing,

the 2 nd liquid flow path is formed on at least one of a surface of the 1 st porous body in contact with the 2 nd inner wall surface and a surface of the 2 nd porous body in contact with the 2 nd inner wall surface.

3. A heat diffusion device according to claim 2, wherein,

in a cross section perpendicular to a direction in which the core extends, a width of the 2 nd liquid flow path is smaller than both a width of the 1 st porous body and a width of the 2 nd porous body, and a height of the liquid flow path is smaller than both 1/2 of a height of the 1 st porous body and 1/2 of a height of the 2 nd porous body.

4. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, the width of the 1 st porous body and the width of the 2 nd porous body are respectively 50 μm to 300 μm.

5. A heat diffusion device according to claim 2 or 3, wherein,

In a cross section perpendicular to a direction in which the core extends, the height of the 1 st porous body and the height of the 2 nd porous body are respectively 20 μm to 300 μm.

6. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, the 1 st porous body and the 2 nd porous body are each not constant in width in the thickness direction.

7. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, a width of an end portion of each of the 1 st porous body and the 2 nd porous body on the 2 nd inner wall surface side is narrower than a width of an end portion on the 1 st inner wall surface side.

8. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, the 1 st porous body and the 2 nd porous body each continuously narrow in width from an end portion on the 1 st inner wall surface side toward an end portion on the 2 nd inner wall surface side.

9. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to the direction in which the core extends, the 1 st porous body and the 2 nd porous body each become narrower stepwise from an end portion on the 1 st inner wall surface side toward an end portion on the 2 nd inner wall surface side.

10. A heat diffusion device according to claim 7 wherein,

the 1 st porous body and the 2 nd porous body are connected to each other at the end portion on the 1 st inner wall surface side.

11. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, each of the 1 st porous body and the 2 nd porous body has a portion wider between an end portion on the 1 st inner wall surface side and an end portion on the 2 nd inner wall surface side than the end portion on the 1 st inner wall surface side and the end portion on the 2 nd inner wall surface side.

12. A heat diffusion device according to claim 2 or 3, wherein,

in a cross section perpendicular to a direction in which the core extends, each of the 1 st porous body and the 2 nd porous body has a portion having a narrower width between an end portion on the 1 st inner wall surface side and an end portion on the 2 nd inner wall surface side than the end portion on the 1 st inner wall surface side and the end portion on the 2 nd inner wall surface side.

13. A heat diffusion device according to claim 2 or 3, wherein,

the pore diameters of the 1 st porous body and the 2 nd porous body are 50 μm or less, respectively.

14. A heat diffusion device according to claim 2 or 3, wherein,

Further comprising a plurality of struts which are disposed in the vapor flow path and support the 1 st inner wall surface and the 2 nd inner wall surface of the housing from the inside,

in the thickness direction, the height of the pillar is higher than both the height of the 1 st porous body and the height of the 2 nd porous body.

15. A heat diffusion device according to claim 1, wherein,

further comprises a support body arranged in the housing along the extending direction of the core body,

the adjacent cores each include a porous body supported by the support,

the 1 st liquid flow path is formed in a space surrounded by a part of the porous body, a part of the housing, and a part of the support body.

16. A heat diffusion device according to any one of claims 1 to 3,

in a cross section perpendicular to the direction in which the core extends, the width of the vapor flow path is 1000 [ mu ] m or more and 3000 [ mu ] m or less, and the width of the 1 st liquid flow path is 50 [ mu ] m or more and 500 [ mu ] m or less.

17. A heat diffusion device according to any one of claims 1 to 3,

the density of the flow paths at the evaporation portion is higher than the density of the flow paths at a portion away from the evaporation portion.

18. The heat spreading device according to claim 17, wherein,

the housing has a plurality of the evaporation portions.

19. A heat diffusion device according to any one of claims 1 to 3,

the vapor flow passage is provided with a plurality of struts which are arranged in the vapor flow passage and support the 1 st inner wall surface and the 2 nd inner wall surface of the housing from the inside.

20. A heat diffusion device according to any one of claims 1 to 3,

the ends of the adjacent cores on the evaporation portion side are connected to each other, and the 1 st liquid flow paths communicate with each other.

21. A heat diffusion device according to any one of claims 1 to 3,

the ends of the adjacent cores on the opposite side to the evaporation portion are connected to each other, and the 1 st liquid flow paths communicate with each other.

22. A heat diffusion device according to any one of claims 1 to 3,

the plurality of cores extend along a planar shape of the housing as viewed from the thickness direction.

23. A heat diffusion device according to any one of claims 1 to 3,

a 3 rd liquid flow path extending in a direction in which the core extends is formed in the vapor flow path,

In a cross section perpendicular to a direction in which the core extends, a width of the 3 rd liquid flow path is smaller than a width of the 1 st liquid flow path,

in the thickness direction, the 3 rd liquid flow path has a lower height than the 1 st liquid flow path.

24. A heat diffusion device according to any one of claims 1 to 3,

the housing is formed by joining an outer edge portion of a 1 st sheet having the 1 st inner wall surface and an outer edge portion of a 2 nd sheet having the 2 nd inner wall surface,

the 1 st sheet is in the shape of a flat plate with constant thickness,

the 2 nd sheet is formed such that the outer edge portion is thicker than a portion other than the outer edge portion.

25. A heat diffusion device according to any one of claims 1 to 3,

the 1 st sheet is in the shape of a flat plate with constant thickness,

the 2 nd sheet is of a shape in which the thickness is constant and a portion other than the outer edge portion protrudes outward relative to the outer edge portion.

26. A heat diffusion device according to any one of claims 1 to 3,

The heat exchanger further comprises at least one of a core portion arranged along the 1 st inner wall surface and a core portion arranged along the 2 nd inner wall surface.

27. A heat diffusion device according to claim 1, wherein,

the core includes a porous body supported by the support,

the 1 st liquid flow path is formed in a space surrounded by a part of the porous body, a part of the housing, and the support body,

the 2 nd liquid flow path is disposed on the opposite side of the 1 st liquid flow path with the porous body interposed therebetween.

28. An electronic device, characterized in that,

a heat diffusion device according to any one of claims 1 to 27.