JP6509680B2 - Sheet-like heat pipe - Google Patents

Description

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

  Heretofore, in order to diffuse the heat generation of 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. Such a sheet-like heat pipe forms a sealed container for containing a working fluid such as water in the inside of a main body in which two sheet bodies are stacked, and the capillary force by the wick formed on the inner wall surface of the container The working fluid is circulated between the heat receiving portion and the heat radiating portion of the main body, and the heat from the CPU thermally connected to the heat receiving portion is transported to the heat radiating portion and dissipated to the outside.

Japanese Patent Application Publication No. 2007-150013 JP 2007-183021 A

  However, portable information devices equipped with a heat source such as a CPU can take various postures according to the usage conditions. Therefore, for example, if the sheet-like heat pipe is kept upright at a low temperature so-called top heat posture, the working fluid biased to a specific place by gravity expands (in the case of water, it expands at 4 ° C. or less). Was locally deformed, causing a concern that sufficient heat transport capacity could not be exhibited.

  Therefore, in view of the above problems, the present invention provides a sheet-like heat pipe which can exhibit sufficient heat transport capacity without expansion deformation of the main body under low temperature, regardless of the posture. The purpose is

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 stacked, and the container has a capillary structure. A plurality of vapor passages and capillary passages are formed on the inner surface of the first sheet body, and a recess for accommodating the capillary structure is formed on the inner surface of the second sheet body; A heat receiving portion thermally connected to a heat source is disposed on the outer surface of the sheet body, a support column holding the capillary structure is protruded in the recess in a portion except the heat receiving portion, and the capillary passage is a first groove is formed in a band shape, and a third groove which is formed in communication alternately on the right and left sides of the first groove, and wherein Rukoto equipped with.

  According to the invention of claim 1, one side of the container filled with the working fluid has a vapor passage and a capillary passage formed on the inner surface of the first sheet body, while the other side of the container has the second sheet body A capillary structure separate from the main body is disposed by utilizing a recess formed on the inner surface. Therefore, even if the main body is placed in any posture, the capillary structure disperses the working fluid uniformly on the other side of the container without concentrating the working fluid at a specific location, and the expansion of the working fluid at low temperature It is possible to prevent the accompanying local deformation of the main body.

  In addition, since the capillary structure expanding inside the container is held at a position determined by the support column, it is possible to prevent the capillary structure from being biased to a specific location, regardless of the posture of the main body. In addition, since the heat receiving portion is not provided with the support column, the working fluid in the liquid phase can be transported to the whole heat receiving portion by the capillary structure without being disturbed by the support columns, and sufficient as a sheet-like heat pipe It can exhibit heat transport capacity.

  According to the second aspect of the present invention, in addition to the first groove connected to the third groove, the second groove extending continuously from the third groove is disposed without connecting to the third groove. The second groove conveys the working fluid of the liquid phase taken in from one end to the other end as it is while conveying the working fluid of the liquid phase from one end to the other end while taking in the working fluid of the liquid phase halfway Can. Therefore, it is possible to exhibit a sufficient heat transport capacity as a sheet-like heat pipe.

According to the second aspect, the second groove does not lead to the third groove, by providing the outer peripheral portion of the container, to carry the working fluid reaches the periphery of the container liquid phase rapidly to the entire container It will be possible.

According to the first aspect, the third and the liquid phase working fluid that enters from the groove, another third enters from the groove liquid phase which communicates with the other side of the first groove communicating at one side of the first groove The working fluid can be taken into the first groove without interfering with each other, and the working fluid in the liquid phase can be smoothly transported from one end of the first groove to the other end. Therefore, it is possible to exhibit a sufficient heat transport capacity as a sheet-like heat pipe.

According to the configuration of claim 3 , if the capillary passage is not provided in the inner surface area of the first sheet body where the capillary structure does not cover, the working fluid of the liquid phase does not enter the area, and the main body is localized under low temperature Can be effectively eliminated.

According to the configuration of claim 4 , the width of the liquid pool formed between the recess and the capillary structure is not more than twice the width of the capillary passage, so that the liquid pool is eliminated and degassed in the container. It is possible to further improve the heat transport capacity of the sheet-like heat pipe by improving the degree of vacuum.

According to the configuration of the fifth aspect , by providing the projection in the second passage, when the inside of the container is evacuated, it is possible to avoid the possibility of the main body being dented and the steam passage being crushed, and the wider than the first passage. By forming the second passage portion, even if the second passage portion is provided with a projection, the working fluid in the gas phase can be transported smoothly with the first passage portion.

According to the configuration of claim 6 , by forming the projections provided in the second passage portion for the capillary passage, it is possible to further enhance the capillary force by the capillary passage.

It is a top view of the 2nd sheet body common to a 1st embodiment-a 3rd embodiment about a sheet-like heat pipe of the present invention. It is a top view of the capillary structure common to 1st Embodiment-3rd Embodiment same as the above. It is a top view of the 1st sheet body in a 1st embodiment of the present invention. It is an internal top view of the sheet-like heat pipe of a completed state same as the above. FIG. 6 is an enlarged plan view of an essential part of FIG. It is a top view of the 1st sheet body in a 2nd embodiment of the present invention. It is an internal top view of the sheet-like heat pipe of a completed state same as the above. FIG. 10 is an enlarged plan view of an essential part of FIG. It is a top view of the 1st sheet body in a 3rd embodiment of the present invention. 10 is an enlarged plan view of an essential part of FIG. It is principal part sectional drawing of the conventional sheet-like heat pipe. It is principal part sectional drawing of the sheet-like heat pipe common to 1st Embodiment-3rd Embodiment of this invention. It is a principal part top view which shows the pattern shape of the wick in the conventional sheet-like heat pipe. It is a principal part top view which shows the pattern shape of the wick in 1st Embodiment-3rd Embodiment of this invention. It is a graph which shows the relationship of the liquid volume of a hydraulic fluid, and the temperature of a heat source between the conventional sheet-like heat pipe and the sheet-like heat pipe in 1st Embodiment-3rd Embodiment of this invention. It is a graph which shows the relationship of the liquid volume of a hydraulic fluid, and the temperature of a heat source between the conventional sheet-like heat pipe and the sheet-like heat pipe in 1st Embodiment-3rd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to a sheet-like heat pipe (hereinafter referred to as SHP) mounted on a portable device such as a tablet terminal. In the description of each embodiment, the common parts are denoted by the same reference numerals, and the description of the common parts is omitted as much as possible in order to avoid duplication.

  1 to 5 show an SHP 1 according to a preferred first embodiment. As shown in FIG. 4 and FIG. 5, the SHP 1 in the completed state has the main body 2 in which the first sheet body 11 and the second sheet body 12 which are at least two copper foil sheets are diffusion bonded. A sealed container 15 is formed. These sheet bodies 11 and 12 may use other metal sheets which have good thermal conductivity and can be etched or pressed, such as aluminum. The completed SHP 1 is flat and has an outer shape that matches the inner shape of the case of a portable information terminal such as a smartphone or a tablet. Further, in order to seal a working fluid (not shown) such as pure water in a vacuum state inside the container 15, a cylindrical liquid injection nozzle 17 which can be welded is formed in the container 15.

  Next, the configuration of each part of the SHP 1 will be described in detail. FIG. 1 is a plan view of the second sheet body 12 alone as viewed from the inner side, FIG. 2 is a plan view of a nonwoven fabric 40 alone described later, and FIG. 3 is a plan view of the first sheet body 11 alone from the inner side. It is the top view seen. The above-mentioned FIG. 4 and FIG. 5 make the 2nd sheet body 12 shown in FIG. 1 and the nonwoven fabric 40 shown in FIG. 2 inside out, and the internal plane of SHP1 of the completed state piled up on the 1st sheet body 11 shown in FIG. FIG.

  First, to explain from the configuration of the first sheet body 11 shown in FIG. 3, the first sheet body 11 is etched to the middle of its thickness by half etching only on one side surface to be the inner surface of the container 15 The steam passage 20 transports the vapor in which the working fluid has evaporated in the heat receiving portion to the heat radiating portion, and the wick 22 returns the working fluid condensed in the heat radiating portion to the heat receiving portion. In addition to the steam passage 20 and the wick 22, a convex joint 30 which forms a boundary with the container 15 is formed on the inner surface of the first sheet 11 along the outer periphery of the first sheet 11. . As described above, a plurality of steam passages 20 and a 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 bonding portion 30.

  The steam passage 20 is wider than the first passage portion 21A and the first passage portion 21A, which are arranged side by side in a plurality of I-shaped strip shapes in plan view in the inside of the sealed container 15, and is I-shaped. A plurality of second passage portions 21B arranged in a plurality of narrow bands and a series of third passage portions 21C formed in communication with one end of the first passage portions 21A and the second passage portions 21B; It consists of

  In particular, in the present embodiment, the first passage portions 21A are formed side by side along the longitudinal direction of the container 15, and the second passage portions 21B are formed side by side in an oblique direction with respect to the first passage portions 21A. Further, all the second passage portions 21B communicate with at least one of the first passage portions 21A, and between the first passage portion 21A and the second passage portion 21B, vapor of the working fluid serving as a gas phase can be obtained. It makes distribution possible directly. The third passage 21C is formed along the outer periphery of the container 15, and the first passage 21A and the second passage 21B are disposed in communication with the third passage 21C inside the third passage 21C. Ru. It should be noted that each passage portion 21A to 21C of the steam passage 20 may be communicated in any shape and at any position.

  The second passage portion 21B is provided with a projection 32 for preventing deformation of the main body 2 when the inside of the container 15 is evacuated. In each of the second passage portions 21B, the projections 32 are formed in a line at predetermined intervals along the flow direction so as not to impede the flow of the steam in the second passage portion 21B as much as possible. The protrusions 32 are formed in a convex shape on the inner surface of the first sheet 11 as a part of the portion not etched by the above-described etching process. The shape, arrangement, and the like of the protrusions 32 are not limited to those shown in the present embodiment.

  The wick 22 is formed inside the container 15 at a site excluding the vapor passage 20. More specifically, in the interior of the container 15, a plurality of first wicks 22A arranged side by side in a strip shape of, for example, an I shape in plan view, and an oblique direction with respect to the first wick 22A A plurality of second wicks 22B arranged side by side in a strip shape and the portion of the liquid injection passage 17A of the liquid injection nozzle 17 communicating with the vapor passage 20 are formed on substantially the entire outer periphery of the container 15. All the wicks 22 are configured by the series of third wicks 22C.

  In particular, in the present embodiment, all the second wicks 22B are formed continuously with at least one of the first wicks 22A, and between the first wick 22A and the second wick 22B, the working fluid in the liquid phase is formed. It makes distribution possible directly. In addition, although all of the first passage portion 21A and the second passage portion 21B are connected to the third passage portion 21C, none of the first wick 22A and the second wick 22B are connected to the third wick 22C.

  The structure of the wick 22 will be described in detail based on FIG. 5. The first wick 22A and the second wick 22B constituting the wick 22 both have a concave groove 26 etched by etching and a convex not etched. In the region of the wick 22, a plurality of grooves 26 are formed by the wall 27 in the desired shape. The structure combining such fine grooves 26 and walls 27 is common to any position of the wick 22.

  A groove 26 which is a groove for obtaining capillary force as the wick 22 is formed on the same plane as the first passage portion 21A, the second passage portion 21B and the third passage portion 21C which constitute the steam passage 20. Further, in the present embodiment, the plurality of first grooves 26A arranged in a strip shape along the longitudinal direction in which the wick 22 is extended and the first grooves 26A such that every groove 26 communicates with the steam passage 20. And a plurality of third grooves 26C arranged at regular intervals orthogonal to the first grooves 26A. The first groove 26A and the third groove 26C are present in all of the first wick 22A, the second wick 22B and the third wick 22C, but the length, arrangement interval and number thereof depend on the shape of the wall 27. Each is decided independently. On the other hand, the wall 27 for forming the groove 26 is formed in, for example, a rectangular shape or a V shape in a plan view. The shapes and the like of the grooves 26 and the walls 27 shown in the drawings are merely examples, and may be changed as appropriate so as to obtain a desired capillary force.

  In the present embodiment, each first groove 26A is in communication with at least one third groove 26C. In particular, focusing on the first wick 22A and the second wick 22B, the plurality of third grooves 26C aligned on the right side of the first groove 26A and the plurality of third grooves 26C aligned on the left side of the first groove 26A in plan view The first grooves 26A communicate alternately with each other at different positions. Thereby, in the first wick 22A and the second wick 22B, the working fluid of the liquid phase which has entered from the third groove 26C communicating with the right side of the first groove 26A, and another third fluid communicating with the left side of the first groove 26A. The working fluid in the liquid phase entering from the groove 26C is taken into the first groove 26A without interfering with each other, and the working fluid in the liquid phase is smoothly transported from one end to the other end of the band-shaped first groove 26A. Can.

  On the other hand, the third wick 22C surrounding all of the first wick 22A and the second wick 22B is aligned with the plurality of third grooves 26C aligned on the right side of the first groove 26A and the left side of the first groove 26A in plan view A plurality of third grooves 26C communicate with the first grooves 26A at the same position. As a result, in the third wick 22C, the working fluid in the liquid phase is cornered to the entire peripheral region which is the outer peripheral portion of the container 15 by using the third groove 26C which is substantially linearly connected on the right and left sides of the first groove 26A. It will be possible to reach each other.

  That is, in the present embodiment, the container 15 is configured by making the arrangement of the third groove 26C in the first wick 22A and the second wick 22B different from the arrangement of the third groove 26C in the third wick 22C as described above. The optimal capillary action can be realized in each part of the inside, and the heat transport capacity can be exhibited as SHP1.

  Subsequently, to describe the configuration of the second sheet body 12 shown in FIG. 1, 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 which becomes the inner surface of the container 15. Although the joint portion 30 such as the first sheet body 11 is formed, the steam passage 20 is not formed at all. Instead, a wide recess 50 for accommodating the sheet non-woven fabric 40 shown in FIG. 2 in the interior of the container 15 in the interior region of the container 15 surrounded by the joint 30 so as to substantially occupy the interior region. Is formed. Moreover, the heat receiving part 51 for attaching CPU etc. which become the heat source X of a portable information terminal is provided in the outer surface which is not forming the recessed part 50 of the 2nd sheet | seat body 12. FIG. The heat source X may not be in direct contact with the heat receiving portion 51, as long as at least heat from the heat source X is transferred to the heat receiving portion 51, so-called heat connection. For example, in order to reduce the thermal resistance between the heat source X and the second sheet body 12, thermal grease having a desired thermal conductivity may be interposed therebetween.

  In the inner area of the recess 50, a plurality of support columns 52 are arranged in a zigzag at predetermined intervals. The support column 52 is for holding the sheet-like non-woven fabric 40 so as not to move in the interior of the container 15, and projects substantially uniformly over the entire surface of the recess 50 at the portion excluding the heat receiving portion 51 described above. Be placed. Here too, the recess 50 and the support column 52 are formed depending on whether the inner surface of the second sheet body 12 is etched by etching or not.

  FIG. 2 shows the appearance of the non-woven fabric 40 housed in the recess 50. The non-woven fabric 40 is formed into a sheet shape which is matched with the outer shape of the recess 50 as a whole by randomly intertwining fibers of the same material as the main body 2, for example, oxygen free copper without weaving. Further, in the non-woven fabric 40, the through holes 42 are respectively disposed at intervals in positions corresponding to the above-described support posts 52. Thus, the non-woven fabric 40 can be accommodated in the recess 50 without displacement by causing the corresponding support columns 52 to penetrate through the individual through holes 42.

  As shown in FIG. 1, the side wall surface of the recess 50 has a polygonal shape in plan view and has at least three or more corner portions 54, but all the corner portions 54 are formed in an R shape. In addition, the non-woven fabric 40 is formed in an outer shape that matches the shape of the container 50 in plan view. At this time, if the corner 54 of the recess 50 is formed in an R shape without being formed in a projecting shape, the nonwoven fabric 40 and the corner of the non-woven fabric 40 facing the corner 54 are It is possible to fill the space between the recess 50 as much as possible.

  The 2nd sheet | seat body 12 shown in FIG. 1 and the nonwoven fabric 40 shown in FIG. 2 are common not only to this embodiment but to 2nd Embodiment and 3rd Embodiment which are mentioned later. In each of these embodiments, instead of the non-oxidized copper non-woven fabric 40 described above, it may be a capillary structure using a mesh molded body made of another metal woven fabric or non-woven fabric or a metal porous body. Further, each support column 52 may be configured as a combination of the groove 26 and the wall 27 like the wick 22 described above, and may be a capillary tube portion having a capillary action on the support column 52.

  In order to manufacture the SHP 1 described above, in a state where the non-woven fabric 40 is accommodated in the recess 50 of the second sheet body 12, the two sheet bodies 11 and 12 of the same shape are overlapped with their inner surfaces inside At least both junctions 30 are joined so that a container 15 containing fluid is configured. Next, after 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 so that the function as the container 15 can be obtained. It has become.

  Moreover, in the state which accommodated the nonwoven fabric 40 in the recessed part 50 of the 2nd sheet | seat body 12, when the one side surface where the sheet bodies 11 and 12 were etched were faced, and both joining parts 30 were joined, it formed in a bag shape. In the inside of the container 15, the opening surface of the first passage portion 21A is closed by the non-woven fabric 40 to form a hollow cylindrical first steam passage 20A, and similarly the opening surface of the second passage portion 21B is formed of non-woven fabric 40. As a result, the hollow cylindrical second steam passage 20B is formed, and the opening surface of the second passage portion 21B is closed by the non-woven fabric 40, whereby a hollow cylindrical third steam passage 20C is formed. At this time, in the inside of the container 15, the steam passages 20 are provided by the first steam passage 20A, the second steam passage 20B, and the third steam passage 20C, and a plurality of first steams are formed along the outer shape of the container 15. The passage 20A and the second steam passage 20B communicate with the third steam passage 20C. The joint portion 30 is located at an overlapping position when the inner surfaces of the sheet bodies 11 and 12 face each other, and finally seals the outer peripheral portion of the main body 1 by diffusion bonding.

  In the present embodiment, the first wick 22A and the second wick 22B formed in the first sheet body 11 and the support pillars 52 formed in the second sheet body 12 are disposed to face each other except the heat receiving portion 51. Therefore, when evacuating the inside of the container 15 by degassing, the wall 27 constituting the first wick 22A or the second wick 22B abuts on the support column 52 of the second sheet body 12 so that the deformation of the main body 2 It is possible to prevent dents due to Furthermore, in the present embodiment, since the plurality of projections 32 are disposed in the first sheet body 11 in the second passage portion 21B, the projections 32 abut on the non-woven fabric 40 that blocks the opening surface of the steam passage 20. It is also possible to avoid the possibility of the steam passage 20B being crushed due to the main body 2 being dented. Moreover, since the second passage portion 20B is wider than the first passage portion 20A, even if the second passage portion 20B is provided with the projection 32, the working fluid in the vapor phase smoothly with the first passage portion 20A. Can also be transported.

  Further, as described above, when the support column 52 is provided with the capillary tube portion, the first wick 22A and the second wick 22B that similarly exert the capillary force by the combination of the groove 26 and the wall 27 can be used as the support column 52. By facing them, it becomes possible to carry out smooth transport of the working fluid between them. In addition, if at least the support column 52 and the wall 27 of the first wick 22A and the second wick 22B are thermally connected (in this case, even if the two are not completely in contact with each other, heat conduction is possible). The heat transfer can be smoothly promoted between these, and temperature equalization can be achieved between the first sheet body 11 and the second sheet body 12.

  In the SHP 1 of the present embodiment, the positions of the heat receiving portion 51 and the heat radiating portion change depending on which portion of the outer surface of the second sheet body 12 is thermally connected to the heat source X. Since the formed first steam passage 20A and the second steam passage 20B are in communication with the third steam passage 20C formed continuously, regardless of the positions of the heat receiving portion 51 and the heat radiating portion, the respective steam passages The entire surfaces of the SHP 1 can be homogenized by connecting the 20A and 20B to each other through the third steam passage 20C.

  The SHP 1 in the completed state shown in FIGS. 4 and 5 is mounted on a thin portable information terminal provided with a heat source X such as a CPU. When the heat source X generates heat inside the portable information terminal and the temperature rises, the heat from the heat source X is transferred to the heat receiving portion 51 of the SHP 1 and the working fluid evaporates in the heat receiving portion 51 to receive the heat receiving portion through the steam passage 20 The steam flows from 51 to the heat radiation portion with low temperature, and heat transport is performed inside the SHP 1. The heat transported to the heat dissipating portion is thermally diffused to the wide planar region of the SHP 1 and dissipates heat from both the front and back surfaces of the SHP 1, that is, one flat surface and the other flat surface. As a result, the portable information terminal can diffuse the heat generated in the heat source X into a wide area and equalize temperature, so the heat spot generated on the outer surface of the portable information terminal is alleviated and the temperature rise of the heat source X is also It can be suppressed.

  On the other hand, in the heat release part of SHP 1, the vapor condenses and the working fluid of the liquid phase accumulates, but within the sheet-like heat pipe 1, the wick 22 formed on both sides of the vapor passage 20 and the opening are further covered. Due to the strong capillary force of the non-woven fabric 40, the working fluid is transmitted along the liquid flow path of the wick 22 and the non-woven fabric 40 and returned from the heat radiating portion to the heat receiving portion 51. In particular, the non-woven fabric 40 rapidly dissipates the working fluid in the liquid phase to the entire container without being confined to one place due to the structure in which a large number of fibers are entangled. There is no shortage of working fluid. Thus, the working fluid converted from the liquid phase to the gas phase again in the heat receiving portion is transmitted through the steam passage 20 and is guided to the heat dissipation portion, whereby heat transport is continued. It can be diffused and exhibits excellent capillary force, which is the original performance as SHP1.

  Further, the effect of providing not only the wick 22 but also the non-woven fabric 40 inside the container 15 is exhibited even at low temperatures. That is, even if the user of the portable information terminal places the main body 2 in any posture, the non-woven fabric 40 does not concentrate the working fluid at a specific location, and is dispersed over the entire 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 under low temperature.

  Next, SHP 1 in a second embodiment of the present invention will be described based on FIGS. 6 is a plan view of the first sheet member 11 of the present embodiment as viewed from the inner surface side, and FIGS. 7 and 8 are a second sheet member 12 shown in FIG. 1 and a non-woven fabric 40 shown in FIG. FIG. 7 is an internal plan view of the SHP 1 in a completed state superimposed on the first sheet body 11 shown in FIG.

  In this embodiment, in addition to the first groove 26A connected to the third groove 26C shown in the first embodiment as the groove 26 of the wick 22, a second groove 26B extending continuously without being connected to the third groove 26C. It is worth noting that it is equipped with Specifically, the groove 26 of the first wick 22A is constituted by only the second groove 26B disposed in a strip shape along the longitudinal direction in which the wick 22 is extended in plan view, and the groove 26 of the second wick 22B is In addition to the second groove 26B, the first groove 26A is connected to both the left and right sides of the second groove 26B or any one side, and a third groove 26C connected to either the left or right side of the first groove 26A. It comprises and is constituted. Further, most of the second groove 26B of the second wick 22B extends in communication with the second groove 26B of the first wick 22A.

  On the other hand, the groove 26 of the third wick 22C is configured without the second groove 26B by connecting the third groove 26C to the left and right sides of the first groove 26A as in the first embodiment. That is, although the third groove 26C forming a part of the groove 26 communicates with the first groove 26A, it does not communicate with the second groove 26B, and only one end and the other end of the second groove 26B are steam passages It communicates with 20. Accordingly, the walls 27 formed on the left and right sides of the second groove 26B are also continuously formed in the shape of a narrow strip from one end to the other end without interruption.

  Further, focusing on the second wick 22B, here, the strip-like wall 27 forming the first groove 26A and the third groove 26C serves as the second passage as the projection 32 for preventing the deformation of the main body 2 described above. It is arranged in the part 21B. The protrusions 32 of the present embodiment are also formed in a line at predetermined intervals along the flow direction so as not to impede the flow of steam in the second passage portion 21B as much as possible.

  In addition, the configuration and manufacturing method of the SHP 1 and the operational effects associated therewith are common to those of the first embodiment, and thus the description thereof will not be repeated.

  In the present embodiment, as the groove 26 formed in the first sheet body 11 inside the container 15, in addition to the first groove 26A connected to the third groove 26C, the groove 26 extends continuously without being connected to the third groove 26C. The second groove 26B is disposed. Therefore, when the first groove 26A conveys the working fluid in the liquid phase from one end to the other end of the strip, the working fluid in the liquid phase can also be taken in from the third groove 26C, The groove 26B can rapidly carry the liquid phase working fluid taken in from one end to the other end as it is. The synergistic effect of the combination of the first groove 26A and the third groove 26C can exhibit a sufficient heat transport capacity as the SHP 1.

  Further, in particular, the third wick 22C disposed around the container 15 is formed with the first groove 26A and the third groove 26C without forming the second groove 26B, and the third wick 22C is surrounded by the third wick 22C. By forming at least the second groove 26B in the first wick 22A and the second wick 22B, in the central region of the container 15, the working region of the liquid phase is rapidly transported by the second groove 26B, while In the surrounding area, the working fluid in the liquid phase from the third groove 26C can be taken into the first groove 26A and transported to every corner. Furthermore, as described in the first embodiment, in the third wick 22C, the third groove 26C is connected in a substantially straight line on the right side and the left side of the first groove 26A. It becomes possible to spread all over the surrounding area, and as a result, the heat transport capacity as SHP 1 is further enhanced.

  Next, SHP 1 in a third embodiment of the present invention will be described based on FIG. 9 and FIG. FIG. 9 is a plan view of the first sheet member 11 of the present embodiment as viewed from the inner surface side, and FIG. 10 is an enlarged plan view of an essential part of FIG. In the present embodiment, only the configuration of the third wick 22C in the second embodiment is different, so an internal plan view in which the first sheet body 11, the second sheet body 12, and the non-woven fabric 40 are overlapped is omitted.

  In the present embodiment, the second groove 26B not connected to the third groove 26C is located not only at the first wick 22A or the second wick 22B located at the central portion of the container 15 but also at the third peripheral portion of the container 15. It is also provided in the wick 22C. The third wick 22C here is a second groove 26B disposed in a strip shape and arranged along the outer peripheral wall surface of the container 15 in a plan view, and the second groove 26B and the inner side of the second groove 26B. And a third groove 26C connected to the inside of the first groove 26A while communicating with the first groove 26A and the third vapor passage 20C, which are similarly arranged in the shape of a thin belt, The groove 26 is formed. Further, one end and the other end of the circulating first groove 26A and the second groove 26B are provided to be opposed to a portion communicating with the liquid injection passage 17A.

  In addition, the configuration and manufacturing method of the SHP 1 and the operation and effects associated therewith are common to the first embodiment and the second embodiment, and thus the description thereof will not be repeated.

  In this embodiment, in the peripheral region of the container 15, in addition to the first grooves 26A connected to the plurality of third grooves 26C, the second grooves 26B not connected to the third grooves 26C are disposed. The working fluid in the liquid phase that has reached the periphery is not only taken from the third groove 26C into the first groove 26A and transported to every corner, but also taken into the second groove 26B to be quickly circulated and transported to the entire container 15 Will also be possible. The number of the first grooves 26A, the second grooves 26B, and the third grooves 26C, the arrangement interval, and the like are not limited to those illustrated.

  Next, the features of the SHP 1 common to the first to third embodiments will be described in detail with reference to FIGS. 11 to 14. FIG. 11 shows a cross-sectional view of the main part of the conventional SHP 1 and FIG. 12 shows a cross-sectional view of the main part of the SHP 1 in each of the above embodiments. Further, FIG. 13 shows a plan view pattern shape of the conventional wick 22 (first wick 22A), and FIG. 14 shows a plan view pattern shape of the wick 22 (first wick 22A) in each of the above embodiments. In each of these drawings, the corresponding components are denoted by the same reference numerals.

  First, comparing FIG. 11 with FIG. 12, in the conventional SHP 1 shown in FIG. 11, among the wicks 22 formed in the first sheet body 11, a part of the grooves 26 whose opening face is not covered with the non-woven fabric 40. 'Is present. Such grooves 26 'communicate with the liquid reservoir gap 45 in the recess 50 where the non-woven fabric 40 does not exist, so if the SHP 1 is left in the top heat posture under low temperature with the portion shown in the figure down, The working fluid in the liquid phase that has entered the groove 26 'is not diffused by the non-woven fabric 40, stays there as it is and freezes and expands, and the main body 2 is locally deformed. In addition, a good capillary force can not be obtained at the portion of the groove 26 ', and the cooling performance as the SHP 1 is reduced.

  On the other hand, in the SHP 1 of each of the embodiments shown in FIG. 12, the opening faces of all the grooves 26 formed in the first sheet body 11 are reliably covered with the non-woven fabric 40. In order to obtain good capillary force. Further, in the region S of the first sheet 11 which is not covered by the non-woven fabric 40, the groove 26 is not provided. As a result, the working fluid in the liquid phase does not enter the region S from the gap 45 of the liquid reservoir in the container 15, and the SHP 1 is left in the top heat posture under low temperature with the portion shown in the figure down. , Body 2 does not deform.

  Furthermore, in order to improve the cooling performance in such a top heat posture, the width d1 of the gap 45 of the liquid pool formed between the inner side wall of the recess 50 and the outer peripheral surface of the non-woven fabric 40 was covered with the non-woven fabric 40 The groove 26 is formed to be twice or less the width d 2 of the groove 26. As a result, it is possible to eliminate the liquid accumulation in the container 15 and to improve the degree of vacuum of the degassing, and to improve the heat transport capacity as the SHP 1.

  Furthermore, as described above, by forming the corner portion 54 in an R shape, the gap that becomes a liquid pool between the non-woven fabric 40 and the recess 50 can be filled as much as possible. The degree of vacuum is improved, and the heat transport capacity as the SHP 1 is improved.

  Next, comparing FIG. 13 with FIG. 14, in the conventional SHP 1 shown in FIG. 13, a plurality of third grooves 26C arranged at regular intervals on one side of the first groove 26A extending in a strip shape, and the first groove 26A. A plurality of third grooves 26C arranged at regular intervals on the other side form the grooves 26 of the wick 22 in such a pattern shape that they communicate with the first grooves 26A at the same position.

  On the other hand, in the SHP 1 of each of the above embodiments, as shown in FIG. 14A, in addition to the first groove 26A communicating with the third groove 26C, the strip-like second groove 26B not communicating with the third groove 26C The grooves of the wick 26 are formed in a combined pattern shape. Alternatively, as shown in FIG. 14B, the plurality of third grooves 26C aligned on one side of the first groove 26A and the plurality of third grooves 26C aligned on the other side of the first groove 26A are the first grooves. The grooves of the wick 26 are formed in such a pattern that they communicate with each other at different positions in a staggered manner. The pattern shape in FIG. 14A is adopted in the SHP 1 of the second embodiment or the third embodiment, and the pattern shape in FIG. 14B is adopted in the SHP 1 of the first embodiment. With these improved pattern shapes, the capillary force in the direction along the first groove 26A and the second groove 26B can be enhanced as compared with the conventional pattern shape.

  Next, the results of comparison of the cooling performance between the conventional SHP 1 and the SHP 1 of the above-described embodiments of the present invention will be described.

  FIG. 15 shows the relationship between the temperature of the heat source X and the volume of the working fluid sealed in the container 15 as a comparison result of the cooling performance. Here, the measurement results of the conventional SHP 1 adopting the configuration of FIG. 11 and FIG. 13 described above are plotted in black rhombus, and the measurement results of SHP 1 in the above respective embodiments adopting the configuration of FIG. 12 and FIG. , Are plotted by open circles.

  As is clear from FIG. 15, in the SHP 1 of the present invention, the liquid amount management range D1 for the optimum heat source temperature range is smaller than the liquid amount management range D2 for the optimum heat source temperature range in the conventional SHP1. That is, it can be seen that the cooling performance is stabilized in the SHP 1 of the present invention even if the liquid volume of the working fluid sealed in the container 15 is smaller than that of the conventional SHP 1. This is considered to be attributable to the configuration in which the support post 52 is not provided in the heat receiving portion 51 and the review of the patterns shown in FIG. 12 and FIG. 14 in each embodiment.

  FIG. 16 also shows the relationship between the amount of hydraulic fluid enclosed in the container 15 and the temperature of the heat source X. Here, the measurement results of the conventional SHP 1 are plotted by open squares, and the measurement results of the SHP 1 in each of the above embodiments are plotted by open rhombuses.

  As is clear from FIG. 16, it can be seen that the temperature difference of the heat source X is smaller with respect to the liquid volume change of the hydraulic fluid sealed in the container 15 compared to the conventional SHP 1 of the invention SHP 1. This is also considered to be due to the configuration in which the support post 52 is not provided in the heat receiving portion 51 in each embodiment, or the review of the patterns shown in FIG. 12 and FIG. Can be secured.

  As described above, in the SHP 1 of the present invention, in common with the first to third embodiments, the working fluid is contained inside the main body 2 in which the first sheet body 11 and the second sheet body 12 are superimposed. It forms and comprises the sealed container 15 to accommodate. The container 15 is provided with a non-woven fabric 40 as a separate capillary structure, and the inner surface of the first sheet 11 is formed with a plurality of vapor passages 20 and grooves 26 of the wick 22 as a plurality of capillary passages. On the other hand, on the inner surface of the second sheet 12, a recess 50 having a shape capable of accommodating the non-woven fabric 40 is formed. Further, a heat receiving portion 51 thermally connected to a heat source X such as a CPU of a portable information terminal is disposed on the outer surface of the second sheet 12, and a support post 52 holding the non-woven fabric 40 is received in the recess 50. It protrudes in the site | part except the part 51. As shown in FIG.

  With such a configuration, the steam passage 20 and the groove 26 are formed on the inner surface of the first sheet 11 on one side of the container 15 filled with the working fluid, while the other sheet on the other side of the container 15 is the second sheet A non-woven fabric 40 separate from the main body 2 is disposed using the recess 50 formed on the inner surface of 12. Therefore, even if the main body 2 is placed in any posture, the non-woven fabric 40 uniformly disperses the working fluid on the other side of the container 15 without concentrating the working fluid at a specific location, and It is possible to prevent local deformation of the main body 2 due to expansion.

  Further, since the non-woven fabric 40 expanding inside the container 15 is held at the position determined by the support column 52, the non-woven fabric 40 can be prevented from being biased to a specific location regardless of the posture of the main body 2 . In addition, since the heat receiving portion 51 is not provided with the support column 52, the working fluid in the liquid phase can be carried to the entire heat receiving portion 51 by the non-woven fabric 40 without being disturbed by the support column 52. It can exhibit sufficient heat transport capacity.

  Further, in the SHP 1 according to the second embodiment and the third embodiment of the present invention, the groove 26 serving as the capillary passage is formed as a first groove 26A as a first groove and a second groove which are both formed to extend in a band shape. The second groove 26B and the third groove 26C as a third groove which are in communication with the first groove 26A but not in communication with the second groove 26B.

  In this case, in addition to the first groove 26A connected to the third groove, the second groove 26B extending continuously without being connected to the third groove 26C is disposed, so that the first groove 26A can receive the liquid from the third groove 26C. The second groove 26B conveys the working fluid of the liquid phase taken in from one end to the other end as it is while conveying the working fluid of the liquid phase from one end to the other end while taking in the working fluid of the phase halfway Can. Therefore, it is possible to exhibit a further sufficient heat transport capacity as the SHP 1.

  Moreover, in SHP 1 in 3rd Embodiment of this invention, the 2nd groove | channel 26B is provided in the outer peripheral part which is a peripheral area | region of the container 15 by planar view.

  In this case, by providing the second groove 26B not connected to the third groove 26C on the outer peripheral portion of the container 15, the working fluid of the liquid phase that has reached the periphery of the container 15 can be rapidly transported to the entire container 15. become.

  Further, in the SHP 1 according to the first embodiment of the present invention, the groove 26 serving as the capillary passage is alternately communicated with the first groove 26A formed extending in a strip shape and one side and the other side of the first groove 26A. A plurality of third grooves 26C are formed.

  In this case, the working fluid of the liquid phase entering from the third groove 26C communicated with one side of the first groove 26A and the action of the liquid phase entering from another third groove 26C communicating with the other side of the first groove 26A The fluid is taken into the first groove 26A without interfering with each other, and the working fluid in the liquid phase can be smoothly transported from one end of the first groove 26A to the other end. Therefore, it is possible to exhibit a further sufficient heat transport capacity as the SHP 1.

  Further, in the SHP 1 in the first to third embodiments of the present invention, the non-woven fabric 40 is disposed so as to cover all the grooves 26 formed in the first sheet 11.

  In this case, by reliably covering all the grooves 26 formed in the first sheet 11 with the non-woven fabric 40, a good capillary force is exhibited by the grooves 26 and the non-woven fabric 40, and a sufficient heat transport capability can be exhibited as the SHP 1 .

  Further, in the SHP 1 in the first to third embodiments of the present invention, the inner surface of the first sheet 11 is configured so as not to provide the groove 26 in the region not covered by the non-woven fabric 40.

  As described above, if the groove 26 is not provided in the inner surface area of the first sheet 11 which the groove 26 does not cover, the working fluid of the liquid phase does not enter the area and the main body 2 locally deforms at low temperature Factor can be effectively eliminated.

  Further, in the SHP 1 according to the first to third embodiments of the present invention, the gap 45 serving as a space-like liquid reservoir is formed between the recess 50 and the non-woven fabric 40, and the width of the gap 45 serving as the liquid reservoir The d 1 is formed to be twice or less the width d 2 of the groove 26.

  Thus, by setting the width of the gap 45 formed between the recess 50 and the non-woven fabric 40 to be not more than twice the width d 2 of the groove 26, the degree of elimination of liquid accumulation in the container 15 and the degree of vacuum of degassing It is possible to further improve the heat transport capacity of SHP 1 by improving it.

  Further, in the SHP 1 in the first to third embodiments of the present invention, the capillary structure is the non-woven fabric 40 as a mesh molded body of a plurality of fibers, and the corner portion 54 formed in the recess 50 is formed in an R shape. doing.

  In this case, even when corner portions of the non-woven fabric 40 are particularly easy to be loosened by fibers, the corner portions 54 of the recess 50 facing it are rounded so that the gap between the non-woven fabric 40 and the recess 50 around the corner portions 54 As much as possible, it is possible to further enhance the heat transport capacity of SHP1.

  Further, in the SHP 1 according to the first to third embodiments of the present invention, the steam passage 20 has a direction different from the first passage portion 21A and the first passage portion 21A arranged in a strip shape along one direction. And a second passage 21B wider than the first passage 21A, and the plurality of projections 32 are provided in the second passage 21B.

  In this case, by providing a protrusion in the second passage portion 21B, the main body 2 is prevented from being dented and the steam passage 20 from being crushed when vacuuming the inside of the container 15, and wider than the first passage portion 21A. By forming the second passage portion 21B, even if the projection 32 is provided in the second passage portion 21B, the working fluid in the gas phase can be transported smoothly with the first passage portion 21A.

  Further, in the SHP 1 in the first embodiment and the second embodiment of the present invention, the protrusion 32 forms a groove 26 which is a capillary passage.

  In this case, by forming the projections 32 provided in the second passage portion 21B for the grooves 26, the capillary force by the grooves 26 can be further enhanced.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, although the sheet members 11 and 12 are diffusion bonded in the above embodiment, another bonding method such as ultrasonic bonding may be adopted, and three or more sheet members 11 and 12 may be stacked and bonded. May be Further, it is not necessary to arrange the third groove 26C orthogonal to the first groove 26A, and it may be arranged at a predetermined angle.

DESCRIPTION OF SYMBOLS 1 sheet-like heat pipe 2 main body 11 1st sheet body 12 2nd sheet body 15 container 20 steam passage 21A 1st passage part 21B 2nd passage part 26 Groove (capillary tube passage, mesh molded body)
26A first groove (first groove)
26B second groove (second groove)
26C third groove (third groove)
32 projections 40 non-woven fabric (capillary structure)
45 gap (liquid accumulation)
50 recessed portion 51 heat receiving portion 52 support column 54 corner portion X heat source

Claims (6)

A sheet-like heat pipe formed by forming a sealed container for containing a working fluid inside a main body in which a first sheet body and a second sheet body are stacked,
The container is provided with a capillary structure,
A plurality of steam passages and capillary passages are formed on the inner surface of the first sheet body,
The inner surface of the second sheet body is formed with a recess for receiving the capillary structure.
A heat receiving portion thermally connected to a heat source is disposed on an outer surface of the second sheet body,
In the concave portion, a support post for holding the capillary structure is provided in a projecting manner at a portion excluding the heat receiving portion .
The capillary channel includes a first groove which is formed in a band shape, the first sheet-like heat pipe and the third groove are formed in communication alternately on the right and left sides of the groove, characterized in Rukoto equipped with. The capillary passage further comprises a second groove that will be formed in a band shape,
Sheet heat pipe of claim 1, wherein Rukoto provided with the second groove in the outer peripheral portion of the container. The sheet-like heat pipe according to claim 1 or 2 , wherein the inner surface of the first sheet body is not provided with the capillary passage in a region not covered with the capillary structure. A space-like liquid reservoir is formed between the recess and the capillary structure,
The sheet-like heat pipe according to any one of claims 1 to 3 , wherein a width of the liquid reservoir is equal to or less than twice a width of the capillary passage. The steam passage is formed by connecting a first passage portion arranged in a band along one direction and a second passage portion which is disposed in a direction different from the first passage portion and is wider than the first passage portion. The sheet-like heat pipe according to any one of claims 1 to 4 , wherein the second passage portion is provided with a projection. The sheet-like heat pipe according to claim 5, wherein the projection forms the capillary passage.

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