JP2016205693A - Sheet-shaped heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-shaped heat pipe capable of exerting a sufficiency heat transport capacity without expanding and deforming a main body under a low temperature regardless of its posture.SOLUTION: One side of a container 15 filled with a working fluid is occupied by a steam passage 20 and a wick 22 formed on an inner face of a first sheet body 11. The other side of the container 15 is occupied by a capillary structure of non-woven fabric 40 by utilizing a recessed portion 50 formed on an inner face of a second sheet body 12. Thus concentration of the working fluid on a specified portion can be prevented by the non-woven fabric 40, and the working fluid can be entirely dispersed at one side of the container 15, thus local deformation of the main body in accompany with expansion of the working fluid under a low temperature can be prevented. Further by combining the wick 22 and the non-woven fabric 40, heat can be properly diffused to a wide region of the main body 2, and excellent capillary force can be exerted as SHP1.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a sheet-like heat pipe that can be mounted on a portable information terminal such as a smartphone or a tablet terminal, and can obtain a sufficient amount of heat transport while being small.

  Conventionally, in order to diffuse the heat generated by a CPU mounted on a portable device such as a tablet terminal, a heat dissipation structure incorporating a sheet-like heat pipe as shown in Patent Documents 1 and 2, for example, has been proposed. In such a sheet-like heat pipe, a sealed container for containing a working fluid such as water is formed inside a main body in which two sheets are overlapped, and a capillary force by a wick formed on the inner wall surface of the container is formed. , The working fluid is recirculated between the heat receiving part and the heat radiating part of the main body, and the heat from the CPU thermally connected to the heat receiving part is transported to the heat radiating part and dissipated to the outside.

JP 2007-150013 A JP 2007-183021 A

  However, a portable information device equipped with a heat source such as a CPU can take various postures depending on the use situation. Therefore, for example, if the sheet-like heat pipe is kept upright at a low temperature, the working fluid biased to a specific location due to gravity expands (in the case of water, expands below 4 ° C), and the main body is localized. There was a concern that sufficient heat transport capability could not be exhibited.

  Therefore, in view of the above problems, the present invention provides a sheet-like heat pipe capable of exhibiting sufficient heat transport capability without being deformed and deformed at a low temperature even when placed in any posture. For the purpose.

  The present invention is a sheet-like heat pipe in which a sealed container for containing a working fluid is formed inside a main body in which a first sheet body and a second sheet body are overlapped, and the container includes a nonwoven fabric. A plurality of steam passages and wicks are formed on the inner surface of the first sheet body, and all the steam passages and the wicks are opposed to the inner surface of the second sheet body. A recess for accommodating the capillary structure is formed.

  According to the first aspect of the present invention, one side of the container filled with the working fluid is occupied by the vapor passage or wick formed on the inner surface of the first sheet body, while the other side of the container facing the first side is the first side. The capillary structure used as a nonwoven fabric occupies using the recessed part formed in the inner surface of 2 sheet | seat body. Therefore, no matter how the main body is placed, the nonwoven fabric distributes the working fluid over one side of the container without concentrating it on a specific location, and the main body is localized as the working fluid expands at low temperatures. Can be prevented. In addition, the combination of the wick formed on the inner wall of the main body and a non-woven fabric that is separate from the main body allows good heat diffusion over a wide area of the main body, and exhibits excellent capillary force as a sheet-like heat pipe. it can.

  According to the invention of claim 2, no matter how the main body is placed, the non-woven fabric that expands on a plane inside the container is held at a position determined by the support pillar and biased to a specific location. Can be prevented.

  According to invention of Claim 3, a capillary structure can be reliably accommodated and hold | maintained in the recessed part of a 2nd sheet | seat body inner surface in the state which made the support pillar penetrate the hole. In addition, since the support column itself includes a capillary portion formed by a convex piece and a groove for exerting a capillary force, the working fluid can be smoothly transported between the support column and the wick facing the support column.

  According to the invention of claim 4, not only the transport of the working fluid but also the movement of heat can be promoted between the support column and the wick facing the support column.

  According to the invention of claim 5, by connecting all of the vapor passages into one inside the container, even if the heat receiving part or the heat radiating part is placed in any part of the main body, the working fluid in the gas phase is in the middle. It becomes possible to transport smoothly without interruption.

  According to the invention of claim 6, since all the steam passages are surrounded by the wick or the capillary structure, the gas phase and liquid in the working fluid can be obtained regardless of where the heat receiving portion or the heat radiating portion is placed. The phase transition of the phase can be performed smoothly.

  According to the seventh aspect of the present invention, the wick is formed not only in the central portion of the container but also in the peripheral portion, so that the operation using the wick can be performed even when the heat receiving portion or the heat radiating portion is placed in any part of the main body. The fluid can be moved.

  According to invention of Claim 8, even if the 1st pattern part is arranged independently, it is liquid phase in all of the 1st pattern part and the 2nd pattern part via the capillary structure of the nonwoven fabric which counters. The working fluid can be moved.

It is a perspective view of the suitable sheet-like heat pipe in one embodiment of the present invention. It is a top view of a 1st sheet | seat body same as the above. FIG. 3 is an enlarged detailed view of a part A shown in FIG. It is a top view of a 2nd sheet | seat body same as the above. FIG. 5 is an enlarged detailed view of a portion B shown in FIG. 4. It is a top view of a capillary structure same as the above. It is a figure showing the internal structure of a container same as the above. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. It is a component drawing of the thermal diffusion unit containing a sheet-like heat pipe in a completed state. It is an assembly drawing of a heat diffusion unit same as the above. FIG. 11 is an assembly view of the heat diffusion unit as seen from a direction different from FIG. 10.

  Hereinafter, a preferred embodiment of the present invention will be described using a sheet-like heat pipe (hereinafter referred to as SHP) mounted on a portable information terminal such as a tablet terminal as an example. Here, first, the configuration of a single SHP will be described, and then the configuration of a thermal diffusion unit including SHP will be described. In these descriptions, common portions are denoted by common reference numerals, and descriptions of common portions are omitted as much as possible to avoid duplication.

  1 to 8 show a preferred embodiment SHP1. First, the configuration of the appearance of the SHP 1 will be described with reference to FIG. 1. The SHP 1 has a main body 2 in which a first sheet body 11 and a second sheet body 12 which are at least two copper foil sheets are diffusion-bonded, and the inside thereof. A hollow sealed container 15 is formed. These sheet bodies 11 and 12 may use other metal sheets that have good thermal conductivity and can be etched or pressed, such as aluminum. As shown in FIG. 1, the completed SHP 1 has a substantially rectangular flat plate shape and has an external shape that matches the internal shape of a portable information terminal such as a smartphone or tablet. Further, in order to enclose a working fluid (not shown) such as pure water in a vacuum state inside the container 15, a cylindrical liquid injection nozzle 17 that can be welded is formed in the container 15. The thickness of the container 15 sealed by the liquid injection nozzle 17 and the main body 2 that becomes SHP1 is 0.6 mm.

  The main body 2 is provided with a plurality of attachment portions 18 formed as through holes. The attachment hole 18 enables attachment of the portable information terminal to the housing. For example, the attachment portion 18 is aligned with a screw hole (not shown) formed in the housing, and a screw as a fastening member (not shown). The SHP 1 including the main body 2 can be easily attached and fixed at a desired position with respect to a housing such as a portable information terminal. In addition, the attachment part 18 is not limited to a through-hole, You may employ | adopt another structure which exhibits an equivalent function.

  In particular, the main body 2 of the present embodiment has a first rectangular portion 5 that extends in a straight line from one end where the liquid injection nozzle 17 is provided to the other end on the opposite side, and a longitudinal direction of the first rectangular portion 5 in a plan view. And it is comprised combining the 2nd rectangular part 6 extended linearly from the transversal direction one side of the 1st rectangular part 5. FIG. The mounting portions 18 are disposed around the second rectangular portion 6. The planar view shape of the main body 2 and the position of the attachment portion 18 are not limited to those described above.

  Next, the structure of each sheet | seat body 11 and 12 is demonstrated in detail. FIG. 2 is a plan view of the first sheet body 11 as seen from the inner surface side in a state before being joined to the second sheet body 12, and FIG. 3 is an enlarged view of a portion A in FIG.

  In the figure, the thickness T1 (see FIG. 8) of the first sheet body 11 is 0.3 mm, and only half the thickness of the first sheet body 11 by half-etching is applied only to one side surface that is the inner surface of the container 15. Etching is performed to form a vapor passage 20 that transports the vapor of the working fluid evaporated in the heat receiving portion to the heat radiating portion, and a wick 22 that returns the working fluid condensed in the heat radiating portion to the heat receiving portion. In addition to the vapor passage 20 and the wick 22, an uneven joint 30 that forms a boundary with the container 15 is formed on the inner surface of the first sheet body 11 along the outer periphery of the first sheet body 11. . As described above, the plurality of vapor passages 20 and the plurality of wicks 22 are alternately formed on the inner surface of the first sheet body 11 in the inner region of the container 15 surrounded by the joint portion 30. Further, the above-described through hole serving as the attachment portion 18 is formed in the joint portion 30 outside the container 15.

  As shown in FIG. 2, the vapor passage 20 includes a first passage portion 21 </ b> A arranged in a plurality of narrow strips such as an L shape and an I shape in a plan view inside the sealed container 15, and these The second passage portion 21B is formed to communicate with one end of the first passage portion 21A. However, this is only an example, and the first passage portion 21A and the second passage portion 21B may be communicated in any shape and in any position.

  The wick 22 is formed in a portion excluding the vapor passage 20 inside the container 15. More specifically, in the inside of the container 15, the first wick 22 </ b> A arranged in a plurality of narrow band shapes such as an L shape and an I shape in a plan view, and the liquid injection of the liquid injection nozzle 17 communicating with the vapor passage 20. Except for the portion of the passage 17 </ b> A, the second wick 22 </ b> B formed on substantially the entire circumference of the outer peripheral portion of the container 15 constitutes all of it. All of the first passage portions 21A are connected to the second passage portion 21B, but none of the first wicks 22A are connected to the second wick 22B, and the first wicks 22A are arranged independently.

  The structure of the wick 22 will be described in detail with reference to FIG. 3. The first wick 22A and the second wick 22B constituting the wick 22 are both concave grooves 26 etched by an etching process and unetched protrusions. A plurality of grooves 26 serving as passages for the liquid-phase working fluid are formed in a desired shape in each region of the first wick 22A and the second wick 22B. Yes. Such a structure in which the fine groove 26 and the wall 27 are combined is common at any position of the wick 22.

  The groove 26 for obtaining a capillary force as the wick 22 is formed on the same plane as the first passage portion 21A and the second passage portion 21B constituting the steam passage 20. A plurality of first grooves 26A arranged at regular intervals along the short direction of the first rectangular portion 5 constituting the main body 2 so that any groove 26 communicates with the steam passage 20, and the first grooves A plurality of first grooves 26 </ b> B that are arranged at regular intervals along the longitudinal direction of the first rectangular portion 5 and are orthogonal to 26 </ b> A are configured. The first groove 26A and the second groove 26B exist in all of the first wick 22A and the second wick 22B, but the length, the arrangement interval, and the number thereof are uniquely determined according to the shape of the wall 27. The On the other hand, the wall 27 for forming the groove 26 is formed in a rectangular shape or an L shape in plan view. The shape of the groove 26 and the wall 27 shown in the figure is merely an example, and may be appropriately changed so as to obtain a desired capillary force.

  FIG. 4 is a plan view of the second sheet body 12 as seen from the inner surface side before being joined to the first sheet body 11, and FIG. 5 is an enlarged view of a portion B in FIG. In the drawing, the thickness T2 (see FIG. 8) of the second sheet body 12 is 0.3 mm, which is the same as the thickness T1 of the first sheet body 11, and the thickness of the main body 2 to be the completed SHP1 is 0. 6 mm. The second sheet body 12 is also etched to the middle of the thickness of the second sheet body 12 by half-etching only on one side surface serving as the inner surface of the container 15. Although the portion 30 is formed, the steam passage 20 is not formed at all. Instead, in the inner region of the container 15 surrounded by the joint portion 30, a wide concave portion 50 for accommodating a nonwoven fabric 40 described later in the container 15 is formed so as to substantially occupy the inner region. In this case as well, a through hole serving as the attachment portion 18 is formed in the joint portion 30 outside the container 15.

  The wick 22 is composed entirely of one third wick 22C formed on the entire outer periphery of the container 15. The structure of the third wick 22C will be described in detail with reference to FIG. 5. Here again, the third wick 22C is composed of a concave groove 26 etched by etching and a convex wall 27 not etched. In the region of the third wick 22C, a large number of grooves 26 serving as passages for the liquid-phase working fluid are formed in a desired shape by the walls 27. In addition, as described above, the groove 26 is configured by orthogonally intersecting the first groove 26A and the second groove 26B in a plan view, and the wall 27 for forming the groove 26 is formed in a rectangular shape or an L shape. Is the same.

  The recess 50 extends to both the first rectangular portion 5 and the second rectangular portion 6, and is surrounded by a narrow strip-shaped third wick 22 </ b> C formed around the periphery of the container 15. In addition, a plurality of support columns 52 are arranged in a staggered manner at a predetermined interval in the entire interior of the recess 50. The support columns 52 are for holding the sheet-like nonwoven fabric 40 so as not to move inside the container 15, and are arranged almost uniformly over the entire surface of the recess 50 without being biased to a specific location. The support column 52 includes four convex pieces 54 having a quarter circle shape in a plan view and a cross-shaped ultrafine groove 56 formed between the convex pieces 54, and the working column itself is a working fluid. It is configured as a capillary part that gives a capillary force to the. Here, the convex piece 54 is formed with a groove 56 and a convex piece 54 depending on whether or not the inner surface of the second sheet body 12 is etched by etching.

FIG. 6 shows the appearance of the nonwoven fabric 40 accommodated in the recess 50. The non-woven fabric 40 is formed into a sheet shape that conforms to the outer shape of the concave portion 50 as a whole by, for example, oxygen-free copper fibers, which are the same material as the main body 2, entangled randomly without being woven. Moreover, in order to obtain a desired capillary force, the nonwoven fabric 40 of this embodiment is formed with a fiber conversion diameter of 30 μm, a basis weight of 500 g / cm ² and a thickness of 0.1 mm without sintering. In the nonwoven fabric 40, through holes 42 are arranged at positions corresponding to the support pillars 52 described above. As a result, the nonwoven fabric 40 can be accommodated in the recess 50 without deviation by allowing the corresponding support pillars 52 to pass through the individual through holes 42.

  In order to manufacture the SHP 1 described above, one sheet of the wick 22 is configured such that two sheets 11 and 12 having the same shape are overlapped with the inner surfaces thereof inside to form a container 15 that contains the working fluid. The part and the side wall 30 are joined. At that time, after joining the side wall 30 which becomes the outer peripheral portion and then injecting and degassing the working fluid using the liquid injection nozzle 17, the liquid injection nozzle 17 is closed to seal the inside of the SHP 1. Thus, the function as the container 15 can be obtained.

  7 and 8 both show a state in which the sheet bodies 11 and 12 are overlapped. When the nonwoven fabric 40 is accommodated in the concave portion 50 of the sheet body 12, when both the joint portions 30 are joined to each other by facing one side where the sheet bodies 11 and 12 are etched, the container 15 formed in a bag shape. , The non-woven fabric 40 closes the opening surface of the first passage portion 21A, thereby forming a hollow cylindrical first vapor passage 20A. Similarly, the non-woven fabric 40 blocks the opening surface of the second passage portion 21B. A hollow cylindrical second steam passage 20B is formed. At this time, in the container 15, a steam passage 20 including a first steam passage 20 </ b> A and a second steam passage 20 </ b> B is disposed, and a plurality of first passages are formed along the longitudinal direction and the short direction of the first rectangular portion 5. The steam passage 20A communicates with the second steam passage 20B formed as one. The joining part 30 is in a position overlapping when the inner surfaces of the sheet bodies 11 and 12 face each other, and finally seals the outer peripheral part of the container 15 by diffusion joining.

  Here, in the present embodiment, the first wick 22A formed on the first sheet body 11 and the support pillar 52 formed on the second sheet body 12 are arranged to face each other. The support column 52 is provided with a capillary portion formed by a convex piece 54 and a groove 56 that exert a capillary force by itself, and is opposed to the first wick 22A that similarly exerts a capillary force by the combination of the groove 26 and the wall 27. By doing so, it becomes possible to smoothly transport the working fluid between the support column 52 and the first wick 22A. Further, at least the convex piece 54 of the support column 52 and the wall 27 of the first wick 22A are thermally connected (in this case, even if both are not completely in contact with each other, heat conduction is possible). Between the first column body 11 and the second sheet body 12, and not only the transport of the working fluid but also the heat transfer can be smoothly promoted between the support column 52 and the first wick 22 </ b> A. So that the temperature can be equalized.

  In the present embodiment, the third wick 22C formed on the second sheet body 12 is disposed to face the second wick 22B formed on the first sheet body 11. However, in a plan view, the width of the second wick 22B is larger than the width of the third wick 22C, and when the sheet bodies 11 and 12 are overlapped, the second wick 22B protruding beyond the third wick 22C does not face. The area is covered with a facing nonwoven 40. In any case, the working fluid can be smoothly transported between the second wick portion 22B and the third wick portion 22C or the nonwoven fabric 40 in the outer peripheral portion of the container 15.

  By the way, in the conventionally known heat pipe having a round cross section, the thickness of 0.9 mm is the limit from the viewpoint of manufacturability and heat transport capability. Therefore, if the thickness of the container 15 and thus SHP1 is 0.9 mm or less, it is possible to provide SHP1 that is thinner than a round heat pipe and has sufficient heat transport capability. Further, when the thickness of the SHP 1 is set to the maximum of 0.9 mm, the thicknesses T1 and T2 (see FIG. 8) of the sheet bodies 11 and 12 may be formed to 0.45 mm per sheet.

  When the vapor passages 20 and the wicks 22 are formed in the sheet bodies 11 and 12 by photoetching, the sheet bodies 11 and 12 each need a thickness T1 and T2 of at least 0.05 mm or more. On the other hand, the number of sheets 11, 12,... May be three or more. However, if the number of sheets increases excessively, it is difficult to align all the sheets 11, 12,. become. In order to obtain the sheet-shaped heat pipe 1 that is thinner than the round heat pipe in consideration of the productivity of the SHP 1, the number of the sheet bodies 11, 12,. Are preferably 0.1 mm or more per sheet. Therefore, the surface of the sheet bodies 11, 12,... Having the thicknesses T1, T2,... 0.1 mm to 0.45 mm is subjected to etching, and the thickness of the completed SHP1 is set to 0.9 mm or less. A fine steam passage 20 and a wick 22 having sufficient heat transport capability can be formed on the inner surface of the container 15, and a thinner SHP1 than a round heat pipe can be installed without difficulty in a thin housing such as a portable information terminal. .

  The sheet-like heat pipe 1 of the present embodiment has different positions of the heat receiving part and the heat radiating part depending on which part is thermally connected to the heat source, but a plurality of first steams formed inside the container 15. Since the passage 20A communicates with the second steam passage 20B formed as one, even if the heat receiving portion and the heat radiating portion are located in any part of the sheet-like heat pipe 1, the respective steam passages 20A, 20B By communicating with each other, the entire surface of the sheet-like heat pipe 1 can be soaked.

  Next, in order to mount the completed SHP1 on a thin information portable terminal, the configuration of the thermal diffusion unit including the SHP1 will be described in detail with reference to FIGS.

  In each of these drawings, the first side frame 61, the second outer frame 62, the third outer frame 63, and the fourth outer frame constituting the outer frame member are all formed on one side plane of the SHP 1 containing the nonwoven fabric 40 described above. A frame 64, a leaf spring 65, a mylar sheet 66, and thermal grease 67 are attached, and a cover 71 is attached to the other side plane of the SHP 1, thereby constituting the heat diffusion unit 100 as a whole. The first outer frame 61 to the fourth outer frame 64 are respectively attached to the outer end of the first rectangular portion 5 of the main body 2, and the leaf spring 65 is attached to the outer end of the second rectangular portion 6 of the main body 2. The leaf spring 65 includes a plurality of spring pieces 65A, and a CPU or the like serving as a heat source for a portable information terminal (not shown) is placed on one side plane of the second rectangular portion 6 of the main body 2 against the bias of the spring pieces 65A. Mounted. At that time, in order to reduce the thermal resistance between the heat source and the main body 2, thermal grease 67 having a desired thermal conductivity is interposed between the two. Mylar sheet 66 serves as an insulating material for heat diffusion unit 100 and is intended to electrically insulate SHP1 from each member of the portable information terminal. Further, the other side flat surface of the second rectangular portion 6 is covered with a cover 71 made of stainless steel made of the same material as the first outer frame 61 to the fourth outer frame 64 and the leaf spring 65.

  As shown in the figure, one side plane and the other side plane of the SHP 1 are both formed by a half etching process to be a flat surface having no unevenness. However, irregularities may be intentionally formed on these surfaces. For example, you may form the uneven | corrugated | grooved part for increasing a thermal radiation area in the one side plane and other side plane of the 1st rectangular part 5 used as a thermal radiation part. Which part of the main body 2 is used as a heat receiving part or a heat radiating part depends on the specifications of the portable information terminal in which the heat diffusion unit 100 is incorporated. Therefore, the configuration shown in FIGS. 9 to 11 is merely an example, and a heat receiving portion and a heat radiating portion may be provided in another part.

  Next, operational effects when the above-described thermal diffusion unit 100 including the SHP 1 is mounted on a thin portable information terminal will be described.

  The heat diffusing unit 100 of this embodiment has an external shape that matches the internal shape of the casing of the portable information terminal, and is installed as it is inside the casing of the portable information terminal. At this time, the second rectangular portion 6 of the main body 2 serving as the SHP 1 is thermally connected in contact with a mother board (both not shown) including a CPU installed inside the housing, with one side plane serving as a heat receiving portion. A heat radiating portion is formed on one side plane or the other side plane of the first rectangular portion 5 which is a part away from the CPU. Then, when the CPU or the like generates heat inside the housing and the temperature rises, the heat from the CPU is transmitted to the heat receiving part of the SHP 1, the working fluid evaporates in the heat receiving part, and the temperature from the heat receiving part passes through the vapor passage 20. Steam flows toward the low heat radiation part, and heat is transported inside the SHP1. The heat transported to the heat radiating portion is thermally diffused in a wide planar area of the SHP 1 and is radiated from the back and front of the SHP 1, that is, both the one side plane and the other side plane. As a result, the portable information terminal can dissipate the heat generated in the CPU over a wide area to equalize the temperature, thereby mitigating the heat spots generated on the outer surface of the portable information terminal and suppressing the temperature rise of the CPU. can do.

  On the other hand, in the heat radiating portion of the SHP 1, the vapor is condensed and the liquid-phase working fluid is accumulated, but the wick 22 formed on both sides of the vapor passage 20 and the opening are covered inside the sheet-like heat pipe 1. Due to the strong capillary force of the non-woven fabric 40, the working fluid is transmitted through the liquid flow path of these wicks 22 and non-woven fabric 40 and returned from the heat radiating portion to the heat receiving portion. In particular, the non-woven fabric 40 has a structure in which a large number of fibers are entangled, so that the liquid-phase working fluid is quickly dissipated to the entire container without staying in one place. There is no shortage of fluid. Thus, since the working fluid converted from the liquid phase to the gas phase again in the heat receiving portion is transmitted through the vapor passage 20 and is guided to the heat radiating portion, heat transport is continued. Diffusion can be performed, and excellent capillary force which is the original performance as SHP1 is exhibited.

  Moreover, the effect which provided not only the wick 22 but the nonwoven fabric 40 inside the container 15 is exhibited also under low temperature. That is, no matter what posture the user of the portable information terminal puts the main body 2, the nonwoven fabric 40 does not concentrate the working fluid at a specific location, and is distributed over one side of the container 15 provided with the recess 50. It is possible to prevent local deformation of the main body 2 due to expansion of the working fluid at a low temperature.

  Furthermore, the thickness of the SHP 1 itself is 0.9 mm or less, more preferably 0.5 mm or less, which is thinner than a round heat pipe. Especially in portable information terminals such as smartphones, a housing that pursues ease of use. It is possible to respond to the limitation on the thickness of the body and quickly diffuse the heat of the CPU or the like over a wide area while taking advantage of the features of SHP1 made of a material having a very good thermal conductivity.

  As described above, the SHP 1 shown in the present embodiment is formed by forming the sealed container 15 that contains the working fluid inside the main body 2 in which the first sheet body 11 and the second sheet body 12 are overlapped. In particular, the container 15 is provided with a capillary structure made of the nonwoven fabric 40, a plurality of vapor passages 20 and wicks 22 are formed on the inner surface of the first sheet body 11, and the inner surface of the second sheet body 12 Opposite to the steam passage 20 and the wick 22, a recess 50 is formed to accommodate the nonwoven fabric 40 having a capillary structure. The depth of the recess 50 is preferably larger than the thickness of the nonwoven fabric 40 in order to accommodate the nonwoven fabric 40 without protruding from the upper surface of the second sheet body 12.

  In this case, one side of the container 15 filled with the working fluid is occupied by the vapor passage 20 and the wick 22 formed on the inner surface of the first sheet body 11, while the other side of the container 15 facing the second side is the second side. The capillary structure which becomes the nonwoven fabric 40 occupies using the recess 50 formed on the inner surface of the sheet body 12. Therefore, even if the main body 2 is placed in any posture, the non-woven fabric 40 disperses the working fluid over one side of the container 15 without concentrating the working fluid at a specific location, and the main body accompanying the expansion of the working fluid at a low temperature. It is possible to prevent local deformation. In addition, the combination of the wick 22 formed on the inner wall surface of the main body 2 and the non-woven fabric 40 that is separate from the main body 2 can perform good heat diffusion over a wide area of the main body 2 and has excellent capillary force as SHP1. Can be demonstrated. Therefore, even when the SHP 1 is placed in any posture, the main body 2 is not expanded and deformed at a low temperature, and a sufficient heat transport capability can be exhibited.

  In addition, a plurality of support columns 52 for holding the nonwoven fabric 40 having a capillary structure protrudes from the recess 50 of the present embodiment.

  In this case, no matter how the main body 2 is placed, the nonwoven fabric 40 spreading on a plane inside the container 15 is held at a position determined by the support pillar 52 to prevent it from being biased to a specific location. be able to.

  Further, in the present embodiment, through holes 42 are provided in the nonwoven fabric 40 having a capillary structure as holes that can penetrate the support columns 52, and each support column 52 is interposed between the plurality of convex pieces 54. It has a capillary section in which a groove 56 is formed, and is disposed to face the first wick 22A of the wick 22. In particular, the height of the support column 52 with the bottom surface of the recess 50 as a base point is preferably a dimension that is at least larger than the thickness of the nonwoven fabric 40 in order to hold the nonwoven fabric 40 reliably.

  In this case, the nonwoven fabric 40 having a capillary structure can be reliably accommodated and held in the concave portion 50 on the inner surface of the second sheet body 12 with the through hole 42 penetrating the support column 52. In addition, since the support column 52 itself includes a capillary portion formed by the convex piece 54 and the groove 56 that exert a capillary force, the support column 52 and the first wick 22A facing the support column 52 are not only held without being displaced. It is possible to smoothly transport the liquid-phase working fluid.

  In the present embodiment, the support column 52 and the first wick 22A of the wick 22 are thermally connected. The term “thermal connection” as used herein refers to not only mechanically joining the protruding piece 54 of the support column 52 and the first wick 22A but also thermal non-contact state via thermal grease or the like. Also includes states where conduction is possible.

  In this case, not only the transportation of the gas-phase working fluid but also the movement of the heat can be promoted between the support column 52 and the first wick portion 22A facing the support column 52, and the temperature of the main body 2 as a whole can be quickly equalized. Can be achieved.

  Further, the steam passage 20 in the present embodiment is configured by the first steam passage 20 </ b> A and the second steam passage 20 </ b> B, all of which are connected inside the container 15.

  In this case, by connecting all the vapor passages 20 in the container 15, the gas phase working fluid is not interrupted in the middle of any part of the main body 2, regardless of where the heat receiving part or the heat radiating part is placed. Smooth transportation is possible.

  Further, all of the first steam passage 20A and the second steam passage 20B in the present embodiment are surrounded by the first wick portion 22A and the second wick portion 22B constituting the wick 22 and the nonwoven fabric 40 having a capillary structure. And formed in a hollow cylindrical shape.

  In this case, since all of the vapor passages 20 are surrounded by the wick 22 and the nonwoven fabric 40 having a capillary structure, the gas phase in the working fluid is not affected by the heat receiving part or the heat radiating part in any part of the main body 2. It is possible to smoothly perform the phase transition of the liquid phase.

  Further, the wick 22 in the present embodiment surrounds the first wick 22A as a plurality of first pattern portions formed continuously in a concavo-convex shape, and the whole of the first wick 22A. And a second wick 22B as a second pattern portion formed continuously in an uneven shape.

  In this case, not only the first wick 22A disposed at the center of the container 15 but also the second wick 22B is formed around the container 15 so that the heat receiving part and the heat radiating part are placed in any part of the main body 2. Even in this case, the working fluid can be moved using the wick 22, and good heat diffusion can be performed over a wide area of the main body 2.

  Further, in the present embodiment, the first wicks 22A are individually arranged independently without being connected to any of the other first wicks 22A and second wicks 22B.

  In this case, even if the first wicks 22A are individually arranged, the liquid-phase working fluid can be smoothly moved in all of the first wick 22A and the second wick 22B through the opposing nonwoven fabric 40. become.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above embodiment, the sheet bodies 11 and 12 are diffusion-bonded, but another bonding method such as ultrasonic bonding may be adopted, and three or more sheet bodies 11 and 12 are overlapped and bonded. May be. The shapes and dimensions of the respective parts described above are merely examples, and can be appropriately changed without departing from the gist of the present invention. Further, the sheet bodies 11 and 12 do not need to have the same shape.

DESCRIPTION OF SYMBOLS 1 Sheet-like heat pipe 2 Main body 11 1st sheet body 12 2nd sheet body 15 Container 20 Steam passage 22 Wick 22A 1st wick part (1st pattern part)
22B 2nd wick part (2nd pattern part)
40 Nonwoven fabric (capillary structure)
42 Through hole (hole)
50 Concave part 52 Support pillar 54 Convex piece (capillary part)
56 Groove (capillary part)

Claims (8)

A sheet-like heat pipe formed by forming a sealed container for containing a working fluid inside the main body where the first sheet body and the second sheet body are overlapped,
The container is provided with a non-woven capillary structure,
A plurality of steam passages and wicks are formed on the inner surface of the first sheet body,
The sheet-like heat pipe is characterized in that a concave portion for accommodating the capillary structure is formed on the inner surface of the second sheet body so as to face all the vapor passages and the wicks.   The sheet-like heat pipe according to claim 1, wherein a support column for holding the capillary structure protrudes from the recess. The capillary structure is provided with a hole penetrating the support column,
The sheet-like heat pipe according to claim 2, wherein the support column has a capillary section in which a groove is formed between a plurality of convex pieces, and is arranged to face the wick.   The sheet-like heat pipe according to claim 3, wherein the support pillar and the wick are thermally connected.   The sheet-like heat pipe according to any one of claims 1 to 4, wherein all of the steam passages are connected inside the container.   The sheet-like heat pipe according to any one of claims 1 to 5, wherein all of the steam passages are surrounded by the wick and the capillary structure.   The wick includes a plurality of first pattern portions that are continuously formed in a concavo-convex shape, and a first pattern portion that is continuously formed in a concavo-convex shape around a periphery of the container, surrounding the whole of the plurality of first pattern portions. The sheet-like heat pipe according to claim 1, wherein the sheet-like heat pipe is configured to include two pattern portions.   The sheet-like heat pipe according to claim 7, wherein the first pattern portions are arranged independently without being connected to the different first pattern portions and the second pattern portions.

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