JP2008286454A - High performance thin heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance heat pipe by improving performance in the maximum heat transporting amount without disordering vapor flow in a container during operating the heat pipe. <P>SOLUTION: This heat pipe with superior capillary force and high performance in the maximum heat transporting amount, comprises the air-tight flat container, operating fluid sealed in the container, and a wick structure composed of at least one wick material kept into contact with prescribed regions of upper and lower inner wall surfaces inside of the container, provided with a space not kept into contact with both side wall surfaces inside of the container, and disposed in the container in a state that the operating fluid does not generate disturbed flow during the operation. An area of each contact face of the prescribed regions where the wick material and the upper and lower both inner wall surfaces of the container are kept into contact with each other, is roughly within a range of 40%-70% of an area in the width direction corresponding to a flat portion of the container. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-performance and thin heat pipe for cooling a cooled object such as a CPU housed in a personal computer, an electronic device or the like, for example, a heating element, a heat transfer body, etc., and particularly its internal structure.

  In recent years, electronic devices such as personal computers have been remarkably downsized and improved in performance, and downsizing and space saving of a cooling mechanism for cooling a heat-generating component such as an MPU mounted thereon are strongly desired. Therefore, in the case of a cooling structure using a heat pipe, there is a demand for higher performance and thinner thickness of the heat pipe.

  A heat pipe is a sealed metal tube that has been degassed in vacuum, and is filled with a condensable fluid as a working fluid. It operates automatically when a temperature difference occurs and evaporates in the high-pitched area. When the working fluid flows to the low temperature part and dissipates and condenses, heat is transported as latent heat of the working fluid.

  That is, a space serving as a flow path for the working fluid is provided inside the heat pipe, and the movement of heat is performed by the working fluid accommodated in the space undergoing phase change and movement such as evaporation and condensation. . On the heat absorption side of the heat pipe, the working fluid evaporates due to the heat generated by the part to be cooled that has been conducted through the material of the container constituting the heat pipe, and the vapor moves to the heat radiation side of the heat pipe. On the heat radiating side, the working fluid vapor is cooled and returned to the liquid phase again. The working fluid that has returned to the liquid phase in this way moves (refluxs) again to the heat absorption side. Heat is transferred by such phase transformation and movement of the working fluid.

  If the working fluid condensed in the heat radiating portion does not return to the heat absorbing portion, the operation of the heat pipe is not continued in the heat pipe. It is necessary to return the working fluid condensed in the heat radiating section to the heat absorbing section. In view of this, a method is known in which a wick (sheet-like wick, wire, or the like) that exhibits a capillary action is disposed in the cavity of the heat pipe, or a fine groove is formed in the inner wall of the cavity.

In particular, in the case of a flat heat pipe, the working fluid must be recirculated against a steam flow that is increased in speed. Therefore, a method of forming a fine groove on the inner wall of the cavity is known. In particular, in the case of a flat heat pipe, since the working fluid must be refluxed against a steam flow that increases in speed, it is common to arrange a wick for the purpose of increasing capillary force.
JP 2004-198096 A

  FIG. 7 is a cross-sectional view of a conventional heat pipe. As shown in FIG. 7, in the case of the heat pipe 100 in which the wick 102 having a relatively small diameter is arranged inside the container 101, the area of the wick that covers the flat portion 104 of the heat pipe 100 is reduced. Since the working fluid inside the heat pipe 100 mainly stays in the flat portion of the wick 102, the amount of working fluid that directly receives the heat from the object to be cooled when the heat from the object to be cooled is transferred to the working fluid. However, there is a problem that the heat density is effectively reduced and the heat density is increased. When the heat density in the evaporation section is increased, dryout is likely to occur and the maximum heat transport amount is not improved.

  FIG. 8 is a cross-sectional view of another conventional heat pipe. As shown in FIG. 8, when the mesh 102 is arranged so as to completely follow the inner wall of the heat pipe container 101, the amount of the wick 102 covering the flat portion 104 of the heat pipe 100 increases, but the container of the heat pipe 100 The steam flow path inside 101 exists only in one place of the hollow part 103 of the wick. In the case of flat heat pipes, in addition to the volume reduction inside the heat pipe due to flattening, the wick is arranged along the entire circumference of the heat pipe, so the internal steam flow path is further reduced and the heat pipe is operating The steam flow is likely to be disturbed, and once the steam flow is disturbed, the performance of the heat pipe is rapidly deteriorated.

  In Patent Document 1, the size of the mesh is defined so as to be 20 to 70% of the width of the heat pipe, but the maximum heat transport amount is not always high in such a wide range. It is not converted. Furthermore, in Patent Document 1, there is a description that it is preferable to set the content within the range of 20 to 40%. However, if the mesh width is defined to be narrow, smooth evaporation in the evaporation portion is not performed, so that the maximum heat It can be expected that the transport volume will instead decrease.

  Therefore, an object of the present invention is to provide a heat pipe having a high maximum heat transport amount without disturbing the steam flow in the container during operation of the heat pipe.

  The inventor conducted extensive research to solve the conventional problems. As a result, in order to improve the maximum heat transport amount by heat pipes, secure a flow path for the steam flow that flows in the container during operation of the heat pipe, and not to cause turbulence in the steam flow. In order to achieve this, it is necessary to secure the flow path of the steam flow by appropriate arrangement of the wick material, and to reduce the area of the contact surface in a predetermined area where the wick material and the upper and lower inner wall surfaces of the container are in contact with each other. It turns out that it is necessary to specify.

The present invention has been made based on the research results described above.
The first aspect of the heat pipe of the present invention is an airtight flat container,
Hydraulic fluid sealed in the container;
A space is provided in contact with a predetermined region of the upper and lower inner wall surfaces inside the container, and not in contact with both side wall surfaces inside the container, so that the hydraulic fluid does not cause turbulence during operation. A wick structure made of at least one wick material disposed in the container, wherein each area of the contact surface of the predetermined area where the wick material and the upper and lower inner wall surfaces of the container are in contact with each other is This is a heat pipe with an excellent capillary force and maximum heat transport amount in the range of approximately 40% to 70% of the corresponding width direction area of the flat portion.

  According to a second aspect of the heat pipe of the present invention, the space inside the container is divided by the wick structure into a hollow portion inside the wick structure and an outer portion of the wick structure. It is a heat pipe.

  A third aspect of the heat pipe according to the present invention is a heat pipe in which the at least one structure is composed of a plurality of wick structures that are connected to each other in the width direction in the container.

  According to a fourth aspect of the heat pipe of the present invention, in any cross section of the container, the shape of the wick structure is substantially symmetric with respect to the center lines in the thickness direction and the width direction. .

  According to a fifth aspect of the heat pipe of the present invention, the wick structure is a wick material formed into a cylindrical shape by a planar mesh sheet, a wick material formed into a cylindrical shape by knitting a metal wire, or sintered. It is a heat pipe made of a wick material formed into a cylindrical shape by a metal body.

  According to a sixth aspect of the heat pipe of the present invention, the wick structure is formed of a flat mesh sheet in at least one part of at least one of the upper and lower inner wall surfaces of the container. It is a heat pipe made of a combination of at least two of a wick material knitted and formed into a cylindrical shape, and a wick material formed into a cylindrical shape by a sintered metal body.

  A seventh aspect of the heat pipe of the present invention is the heat pipe in which the wick structure is composed of at least two layers in at least one of the upper and lower inner wall surfaces of the container.

  The 8th aspect of the heat pipe of this invention is a heat pipe whose height between the upper and lower inner walls of the said container exists in the range of 0.6 mm-1.6 mm.

  According to a ninth aspect of the heat pipe of the present invention, the wick structure is formed of a hollow wick material formed in a cylindrical shape, and a thickness of the wick portion of the wick material is in a range of 0.1 mm to 0.4 mm. It is a heat pipe inside.

  A tenth aspect of the heat pipe of the present invention is the heat pipe in which the thickness of the container is in the range of 0.1 mm to 0.3 mm.

  An eleventh aspect of the heat pipe according to the present invention is a heat pipe in which the width of the container is in the range of 5 mm to 20 mm.

  According to a twelfth aspect of the heat pipe of the present invention, each area of the contact surface of the predetermined region where the wick material and the upper and lower inner wall surfaces of the container are in contact with each other corresponds to an area in the width direction corresponding to the flat portion of the container. This is a heat pipe in the range of approximately 55% to 70%.

  A thirteenth aspect of the heat pipe of the present invention is a heat pipe further comprising a planar mesh disposed between the upper and lower inner wall surfaces of the container and the wick material.

  A fourteenth aspect of the heat pipe of the present invention is the heat pipe further comprising a planar sintered metal disposed between and in contact with the upper and lower inner wall surfaces of the container and the wick material.

  A fifteenth aspect of the heat pipe of the present invention is the heat pipe, wherein the wick structure is formed of a hollow rectangular parallelepiped in which sheet-like wicks are bent and meshes are overlapped on the upper and lower surfaces.

  According to the present invention, it is possible to provide a heat pipe whose maximum heat transport amount is improved without disturbing the steam flow in the container during operation of the heat pipe.

  The heat density in the evaporation part can be reduced by heat diffusion in the mesh flat part, a plurality of steam flow paths can be formed, a stable steam flow can be secured, and a high maximum heat transport amount can be obtained.

  By disposing the wick so as to be in contact with the majority of the flat part of the heat pipe, the hydraulic fluid will stay over the majority of the flat part inside the heat pipe, so the heat from the object to be cooled will be used as the hydraulic fluid. As a result, it is possible to conduct heat well and the effective heat density is reduced, so that the maximum heat transport amount is increased.

  By not providing the wick along the entire circumference of the heat pipe, but by providing a space between the heat pipe inner wall and the wick, the steam flow path forms multiple paths between the hollow portion of the wick and the wick and the heat pipe inner wall. Therefore, the steam generated from the flat portion of the wick due to the heat generated from the object to be cooled spreads mainly in the hollow portion inside the wick, and can spread to the external steam flow path through the gap of the wick.

  Furthermore, even if the steam in the hollow part of the wick is disturbed and the steam pressure rises, the steam moves through the external steam channel through the gap of the wick, and thus the steam is disturbed in one steam channel. In this case, the heat pipe can be operated relatively stably as a whole.

Embodiments of the heat pipe of the present invention will be described with reference to the drawings.
One aspect of the heat pipe of the present invention is an airtight flat container, a working fluid sealed in the container, and a predetermined region on the upper and lower inner wall surfaces inside the container, and between the both side wall surfaces inside the container. Excellent capillary force and maximum heat with at least one wick structure placed in the container so that the working fluid is not turbulent during operation, with no space in contact with it This is a heat pipe with high transport capacity.

  FIG. 1 is a cross-sectional view for explaining a first embodiment of the heat pipe of the present invention. As shown in FIG. 1, a cylindrical mesh wick 2 having a large diameter is disposed inside a flat container 1. The mesh wick is disposed inside the container so that the upper and lower inner walls of the flat portion 6 of the container 1 and the upper and lower surfaces of the mesh wick 2 are in contact with each other. Since the area which the inner wall of the flat part 6 of the container mentioned above and the mesh wick 2 contact is large, the working fluid spreads over the entire flat part of the container. On the other hand, the wick 2 is arranged so that the side surface of the wick does not contact the inner wall side surface of the container.

  By disposing the wick 2 in the container 1 in this way, the hollow portion 3 inside the wick and the space portions 4 and 5 formed by the container inner wall side surface and the wick side surface function as a steam flow path. Therefore, stable operation of the heat pipe can be realized. Since the steam flow path is formed between the hollow part of the wick and the inner wall of the wick, the steam generated from the flat part of the wick spreads mainly in the hollow part inside the wick and passes through the gap of the wick. Can spread to external steam flow path.

  FIG. 6 is a graph showing the relationship between the ratio of the mesh flat portion and the maximum heat transport amount. The vertical axis represents the maximum heat transport amount (W), and the horizontal axis represents the ratio (%) of the mesh flat portion. The ratio of the mesh flat portion is the ratio of the area of the contact surface in a predetermined region where the wick material and the upper and lower inner wall surfaces of the container are in contact with the area in the corresponding width direction of the flat portion of the container. As shown in the graph, when the proportion of the mesh flat portion is 20%, the maximum heat transport amount is 35 W, and the maximum heat transport amount is gradually increased to 55 W until the proportion of the mesh flat portion exceeds 60%. The maximum heat transport amount reaches the maximum at a ratio of 70%.

  As shown in FIG. 6, the ratio of the mesh flat portion is approximately 40% to 70%, and the maximum heat transport amount is a very high value of about 50 W to 56 W. Furthermore, the ratio of the mesh flat portion is approximately 55% to 70%, and the maximum heat transport amount is about 52 W to 56 W, which is a very high value. Therefore, it is necessary to regulate the ratio of the mesh flat portion within a range of approximately 40% to 70%, and more preferably within a range of 55% to 70%. In addition, the case of patent document 1 is shown collectively. In the region where the ratio of the mesh flat portion is 20% to 40%, the maximum heat transport amount is low. This is because the area of the mesh flat portion is small. On the other hand, the heat pipe according to the present invention has a small variation in the maximum heat transport amount, and it is clear that the heat pipe has a high performance.

  In the embodiment shown in FIG. 1, a cylindrical mesh wick having a large diameter is shown as the wick structure, but instead of the mesh wick, a wick material formed by knitting a metal wire into a cylindrical shape, or a sintered metal It may be a wick material formed into a cylindrical shape by the body.

  FIG. 2 is a cross-sectional view for explaining a second embodiment of the heat pipe of the present invention. As shown in FIG. 2, a plurality of (two in FIG. 2) cylindrical mesh wicks 2-1 and 2-2 having a relatively small diameter are arranged in parallel inside the flat container 1 along the flat portion of the container. Are arranged. The mesh wick is disposed inside the container so that the upper and lower inner walls of the flat portion 6 of the container 1 and the upper and lower surfaces of the mesh wicks 2-1 and 2-2 are in contact with each other. Since the area where the inner wall of the flat part 6 of the container mentioned above and the mesh wicks 2-1 and 2-2 contact is large, the working fluid spreads over the entire flat part of the container, and the amount of working fluid in the flat part increases. Also in this embodiment, the wicks 2-1 and 2-2 are disposed so that the container-side side surfaces of the wicks 2-1 and 2-2 do not contact the inner wall side surface of the container. The wicks 2-1 and 2-2 are in contact with each other to form new space portions 7-1 and 7-2 between the wick and the container inner wall.

  By arranging the wicks 2-1 and 2-2 in the container 1 in this manner, the hollow portions 3-1 and 3-2 inside the wick and the space portions 4 and 5 formed by the container inner wall side surface and the wick side surface, Furthermore, new space portions 7-1 and 7-2 formed between the side surfaces in contact with each other between the wicks 2-1 and 2-2 and the inner wall of the container function as steam flow paths. Therefore, stable operation of the heat pipe can be realized. Since a plurality of steam flow paths are formed in the hollow portions 3-1 and 3-2 of the wick and the space portions 4, 5, 7-1 and 7-2 between the wick and the inner wall of the container, from the flat portion of the wick The generated steam mainly spreads in the hollow portions 3-1 and 3-2 inside the wick and the new space portions 7-1 and 7-2 and passes through the gap of the wick to the steam flow paths 4 and 5 outside the wick. Can spread.

  In this embodiment, since there are many acute angle portions formed between the wick and the inner wall of the container, the capillary force is remarkably improved. Furthermore, since there are many wicks which contact the flat part of a container, heat conduction and a movement of a hydraulic fluid become easy, and a thermal performance improves.

  In the embodiment shown in FIG. 2 as well, a cylindrical mesh wick is shown as a wick structure, but instead of a mesh wick, a wick material formed by knitting a metal wire into a cylindrical shape, or a sintered metal body The wick material formed in the cylinder shape may be sufficient.

  FIG. 3 is a cross-sectional view for explaining a third embodiment of the heat pipe of the present invention. As shown in FIG. 3, sheet-like mesh wicks 8-1 and 8-2 are arranged on the inner walls of the flat portion 6 of the flat container 1, respectively, and between the upper and lower sheet-like wicks 8-1 and 8-2. A cylindrical mesh wick 2 having a large diameter is disposed.

  Since the sheet-like wicks 8-1 and 8-2 are respectively arranged on the upper and lower inner walls of the flat part 6 of the container 1, the working liquid spreads to the flat part of the container by the sheet-like wick, and further, the cylindrical wick This facilitates heat conduction and movement of the hydraulic fluid between the upper and lower sheet-like wicks, and improves thermal performance. Also in this embodiment, the wick 2 is arranged so that the side surface of the wick and the inner wall side surface of the container do not contact each other.

  Thus, the sheet-like wicks 8-1 and 8-2 are arranged on the inner walls of the flat portion 6 of the container 1, and a cylindrical mesh having a large diameter between the upper and lower sheet-like wicks 8-1 and 8-2. By disposing the wick 2, the hollow portion 3 inside the wick and the space portions 4 and 5 formed by the container inner wall side surface and the wick side surface function as a steam flow path. Therefore, stable operation of the heat pipe can be realized. Since a plurality of steam flow paths are formed in the hollow portion 3 of the wick and the space portions 4 and 5 between the wick and the container inner side wall, the steam generated from the flat portion of the wick is mainly the hollow portion 3 inside the wick. It can spread to the steam flow paths 4 and 5 outside the wick through the gap of the wick.

  Sheet-like mesh wicks and cylindrical mesh wicks are shown, but instead of mesh wicks, each was formed into a cylindrical shape by a wick material formed by knitting a metal wire or a sintered metal body Wick material may be used.

  FIG. 4 is a cross-sectional view for explaining a fourth embodiment of the heat pipe of the present invention. As shown in FIG. 4, a hollow rectangular wick structure in which a sheet-like wick is bent and meshes are overlapped on the upper and lower surfaces is arranged inside the flat container 1. In this embodiment, sheet-like wicks are folded and overlapped on the wick portions that contact the upper and lower inner walls of the flat portion of the container. Since a plurality of meshes are folded at the flat portion inside the container, the wettability is further improved, and the spreading of the working fluid at the flat portion can be facilitated. Also in this embodiment, the wick 2 is arranged so that the side surface of the wick and the inner wall side surface of the container do not contact each other.

  By disposing the wick 2 in the container 1 in this way, the hollow portion 3 inside the wick and the space portions 4 and 5 formed by the container inner wall side surface and the wick side surface function as a steam flow path. Therefore, stable operation of the heat pipe can be realized. Since the steam flow path is formed between the hollow part of the wick and the inner wall of the wick, the steam generated from the flat part of the wick spreads mainly in the hollow part inside the wick and passes through the gap of the wick. Can spread to external steam flow path.

FIG. 5 is a cross-sectional view for explaining a fifth embodiment of the heat pipe of the present invention. As shown in FIG. 5, the sheet-like sintered metal bodies 9-1 and 9-2 are arranged on the inner walls of the flat portion 6 of the flat container 1, and the upper and lower sheet-like sintered metal bodies 9-1 and 9 are arranged. A cylindrical mesh wick 2 having a large diameter is arranged between -2.
Since the sheet-like sintered metal bodies 9-1 and 9-2 are respectively disposed on the upper and lower inner walls of the flat portion 6 of the container 1, the sheet-like sintered metal bodies 9-1 and 9-2 are used to flatten the container. Since the hydraulic fluid spreads in the part and the sheet-like sintered metal bodies 9-1 and 9-2 and the cylindrical wick 2 are in contact with each other, high wettability is obtained. Also in this embodiment, the wick 2 is disposed so that the side surface of the wick and the inner wall side surface of the container do not contact each other.

  Thus, the sheet-like sintered metal bodies 9-1 and 9-2 are arranged on the inner walls of the flat portion 6 of the container 1, and the diameter is between the upper and lower sheet-like sintered metal bodies 9-1 and 9-2. When the large cylindrical mesh wick 2 is disposed, the hollow portion 3 inside the wick and the space portions 4 and 5 formed by the container inner wall side surface and the wick side surface function as a steam flow path. Therefore, stable operation of the heat pipe can be realized. Since a plurality of steam flow paths are formed in the hollow portion 3 of the wick and the space portions 4 and 5 between the wick and the container inner side wall, the steam generated from the flat portion of the wick is mainly the hollow portion 3 inside the wick. It can spread to the steam flow paths 4 and 5 outside the wick through the gap of the wick.

  In any cross section of the container of the above-described embodiment, the shape of the wick structure is preferably generally symmetric with respect to the center lines in the thickness direction and the width direction. As a result, a uniform heat radiation function can be obtained for the entire heat pipe. In addition to the above, the wick structure is formed into a cylindrical shape by a wick material formed into a cylindrical shape by a planar mesh sheet, a wick material formed by knitting metal wires into a cylindrical shape, and a sintered metal body. You may consist of the combination of 2 or more of the formed wick materials. At this time, at least one of the inner wall surfaces above and below the container may be a combination of two or more. The portion in contact with at least the upper and lower wall surfaces of the wick structure is not limited to two layers, and may be three or more layers.

  Furthermore, the wick structure is formed into a cylindrical shape by a flat mesh sheet, the wick material formed into a cylindrical shape by knitting a metal wire, and the wick material formed into a cylindrical shape from a sintered metal body These wick materials of the same type may be made into two or more layers. At this time, at least one of the inner wall surfaces above and below the container may be the two or more layers described above. In the case of two or more layers, the outer shape is easily maintained.

  In order to improve the maximum heat transport capacity, preferred sizes of the container and the wick will be described. That is, the height between the upper and lower inner walls of the container is preferably in the range of 0.6 mm to 1.6 mm. When the height is lower than the above range, the steam flow path inside the container becomes extremely small, smooth heat transport is not realized, and when the height is higher than the above range, the mesh type heat pipe The groove type heat pipe is more advantageous in terms of thermal performance (cost) than the groove type heat pipe. It is preferable that the thickness of the wick portion of the hollow wick material formed in the above-described cylindrical shape is within a range of 0.1 mm to 0.4 mm. The wall thickness of the container is preferably in the range of 0.1 mm to 0.3 mm. The width of the container is preferably in the range of 5 mm to 20 mm.

  As described above, according to the present invention, it is possible to provide a heat pipe whose maximum heat transport amount is enhanced without disturbing the steam flow in the container during operation of the heat pipe.

FIG. 1 is a cross-sectional view for explaining a first embodiment of the heat pipe of the present invention. FIG. 2 is a cross-sectional view for explaining a second embodiment of the heat pipe of the present invention. FIG. 3 is a cross-sectional view for explaining a third embodiment of the heat pipe of the present invention. FIG. 4 is a cross-sectional view for explaining a fourth embodiment of the heat pipe of the present invention. FIG. 5 is a cross-sectional view for explaining a fifth embodiment of the heat pipe of the present invention. FIG. 6 is a graph showing the relationship between the ratio of the mesh flat portion and the maximum heat transport amount. FIG. 7 is a cross-sectional view of a conventional heat pipe. FIG. 8 is a cross-sectional view of another conventional heat pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2,2-1,2-2 Cylindrical mesh wick 3,3-1,3-2 Hollow part 4 inside a wick 4 Space part 5 Space part 6 Flat part 7 of a container 7 Space part 8 Sheet-like mesh wick 9 Sheet Sintered Metal Body 10 Heat Pipe

Claims (15)

An airtight flat container,
Hydraulic fluid sealed in the container;
A space is provided in contact with a predetermined region of the upper and lower inner wall surfaces inside the container, and not in contact with both side wall surfaces inside the container, so that the hydraulic fluid does not cause turbulence during operation. A wick structure made of at least one wick material disposed in the container, wherein each area of the contact surface of the predetermined area where the wick material and the upper and lower inner wall surfaces of the container are in contact with each other is A heat pipe having a high performance in the maximum heat transport amount, which is approximately in the range of 40% to 70% of the corresponding area in the width direction of the flat portion.   The heat pipe according to claim 1, further comprising a structure in which the space inside the container is divided by the wick structure into a hollow portion inside the wick structure and an outer portion of the wick structure.   The heat pipe according to claim 1 or 2, wherein the at least one structure is composed of a plurality of wick structures that are connected to each other in a width direction in the container.   The heat pipe according to any one of claims 1 to 3, wherein the shape of the wick structure is substantially symmetric with respect to the center lines in the thickness direction and the width direction in any cross section of the container.   The wick structure is formed from a wick material formed into a cylindrical shape by a planar mesh sheet, a wick material formed into a cylindrical shape by knitting a metal wire, or a wick material formed into a cylindrical shape from a sintered metal body The heat pipe according to any one of claims 1 to 4, wherein the heat pipe is formed.   In at least one of the upper and lower inner wall surfaces of the container, the wick structure is a wick material formed in a cylindrical shape by a planar mesh sheet, a wick material formed in a cylindrical shape by knitting metal wires, and The heat pipe according to any one of claims 1 to 4, comprising a combination of at least two wick materials formed into a cylindrical shape by a sintered metal body.   The heat pipe according to any one of claims 1 to 4, wherein the wick structure is composed of at least two layers in at least one of the upper and lower inner wall surfaces of the container.   The heat pipe according to any one of claims 1 to 7, wherein a height between both upper and lower inner walls of the container is in a range of 0.6 mm to 1.6 mm.   The wick structure is made of a hollow wick material formed in a cylindrical shape, and the thickness of the wick portion of the wick material is in the range of 0.1 mm to 0.4 mm. The heat pipe according to item.   The heat pipe according to any one of claims 1 to 9, wherein a thickness of the container is in a range of 0.1 mm to 0.3 mm.   The heat pipe according to any one of claims 1 to 10, wherein a width of the container is in a range of 5 mm to 20 mm.   Each area of the contact surface of the predetermined region where the wick material and the upper and lower inner wall surfaces of the container are in contact is approximately within a range of 55% to 70% of the corresponding area in the width direction of the flat portion of the container. The heat pipe according to any one of claims 1 to 11.   The heat pipe according to any one of claims 1 to 12, further comprising a planar mesh disposed between the upper and lower inner wall surfaces of the container and the wick material.   The heat pipe according to any one of claims 1 to 12, further comprising a planar sintered metal disposed between the upper and lower inner wall surfaces of the container and the wick material. The heat pipe according to any one of claims 1 to 14, wherein the wick structure is formed of a hollow rectangular parallelepiped in which a sheet-like wick is bent and meshes are overlapped on upper and lower surfaces.

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