JP6868476B2 - heat pipe - Google Patents

Description

The present invention relates to a heat pipe such as a flat heat pipe having a good maximum heat transport amount, a small heat resistance, and excellent heat transport characteristics.

The amount of heat generated by electronic components such as semiconductor elements mounted on electrical and electronic devices has increased due to high-density mounting due to higher functionality, and its cooling has become more important. Heat pipes may be used as a cooling method for electronic components.

Further, since the heat pipe is often provided in a narrow space, a flat type heat pipe may be used. Various proposals have been made for the structure of the wick structure provided in the container in order to improve the heat transport characteristics of the heat pipe even if it is a flat type. As a flat heat pipe provided with the wick structure, for example, in a wick structure having a curved portion and a flat portion, the curved portion is in contact with the inner wall of the container or is arranged close to each other at a distance of a predetermined distance or less. Therefore, a flat heat pipe that generates a capillary force between the curved portion and the inner wall has been proposed (Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-43320

In view of the above circumstances, it is an object of the present invention to provide a heat pipe which is small and thin but has excellent heat transport characteristics so that it can be installed in a narrow space.

Aspect of the present invention is a heat pipe having a tubular container, a wick structure arranged in the container, and a working fluid sealed in the container, and having a heat transport direction in the longitudinal direction. The cross section in the direction orthogonal to the longitudinal direction has a first region in which the wick structure is arranged and a second region having a steam flow path, and the second region is the said. A heat pipe that is located above the first region in the direction of gravity and whose inner surface on the lower side in the direction of gravity of the container in the second region is inclined by 15 ° to 90 ° with respect to the direction orthogonal to the direction of gravity. Is.

In the embodiment of the present invention, the heat transport direction is the longitudinal direction, and the cross section in the direction orthogonal to the longitudinal direction is a predetermined longitudinal distance between one flat surface and the one flat surface on the lower side in the gravity direction. A tubular flat container having the other flat surface facing each other and having a horizontal distance orthogonal to the vertical direction exceeding the vertical distance, and a tubular flat container arranged in the flat container. A flat heat pipe having a wick structure and a working fluid enclosed in the flat container, wherein the flat container has a direction in which the other flat surface is orthogonal to the direction of gravity. A flat heat pipe that is arranged at an angle of 15 ° to 90 ° and the wick structure is arranged on the lower side in the direction of gravity with respect to the center line in the lateral direction.

In the above aspect, the flat container is installed in an inclined posture of 15 ° to 90 ° with respect to the gravity direction. Further, the inner surface of one flat surface and the inner surface of the other flat surface have a predetermined vertical distance. That is, the above-mentioned "vertical direction" means a direction orthogonal to one flat surface and the other flat surface. The "longitudinal distance" means the dimension of the interior space of the container in the direction orthogonal to one flat surface and the other flat surface. Further, the "horizontal distance" orthogonal to the vertical direction means a dimension in the direction parallel to one flat surface and the other flat surface in the internal space of the container.

An aspect of the present invention is a flat heat pipe having a vertical distance of 0.50 to 2.0 mm.

An aspect of the present invention is a flat heat pipe having a lateral distance of 3.0 to 10.0 mm.

According to the aspect of the present invention, in the cross section in the direction orthogonal to the longitudinal direction which is the heat transport direction, the second region having the steam flow path is in the gravity direction more than the first region in which the wick structure is arranged. Arranged on the upper side, the inner surface on the lower side in the gravity direction of the container in the second region is inclined by 15 ° to 90 ° with respect to the direction orthogonal to the gravity direction, so that the heat radiation part changes from the gas phase to the liquid phase. The working fluid of the liquid phase that has changed to the phase can be smoothly returned to the heat receiving portion.

According to the aspect of the present invention, the other flat surface located on the lower side in the gravity direction of the flat container is installed so as to be inclined by 15 ° to 90 ° with respect to the direction orthogonal to the gravity direction, and at least in the heat radiating portion, the length is long. By locating the wick structure on the lower side in the direction of gravity with the lateral center line of the cross section perpendicular to the direction as the boundary, the working fluid of the liquid phase that has undergone a phase change from the gas phase to the liquid phase at the heat dissipation part. However, it can be smoothly returned to the heat receiving part.

The smooth return of the working fluid of the liquid phase from the heat radiating part to the heat receiving part means that the working fluid condensed in the radiating part moves to the wick structure by the action of gravity, and further moves to the wick structure by the action of gravity. It is considered that one of the reasons is that the working fluid of the liquid phase is promoted to recirculate the working fluid of the liquid phase in the wick structure. Further, according to the aspect of the present invention, a wick structure through which the working fluid of the liquid phase flows is arranged on the lower side in the direction of gravity, and is a vapor flow path through which the working fluid of the gas phase flows on the upper side in the direction of gravity. .. That is, since the flow paths of the working fluid of the liquid phase and the working fluid of the gas phase are separated on the lower side and the upper side in the direction of gravity, the pressure loss of the working fluid flow of the liquid phase and the working fluid flow of the gas phase Can be prevented.

It is a front sectional view of the heat dissipation part of the flat type heat pipe which concerns on 1st Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA'of a flat heat pipe according to an example of the first embodiment of the present invention. It is a front sectional view of the heat dissipation part of the flat type heat pipe which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the installation mode of the flat type heat pipe which concerns on 1st Embodiment of this invention in an Example. It is explanatory drawing of the temperature measurement position of the flat type heat pipe which concerns on 1st Embodiment of this invention in an Example. (A) is a table showing the results of temperature measurement in Examples, and (b) is a graph showing the results of temperature measurement in Examples.

Hereinafter, the flat heat pipe according to the first embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the flat heat pipe 1 according to the first embodiment is a tubular flat container having one flat surface 11 and the other flat surface 12 facing the one flat surface 11. The wick structure 15 arranged in the flat container 10 and the working fluid F enclosed in the flat container 10 are provided.

As shown in FIG. 1, the flat container 10 of the flat heat pipe 1 has one flat surface 11, one flat surface 11 and the other flat surface 12 facing the lower side in the direction of gravity, and one flat surface. It is a sealed pipe material having one curved surface portion 13 formed between the surface 11 and the other flat surface 12 and the other curved surface portion 14 facing the one curved surface portion 13. In the flat container 10, one flat surface 11 and the other flat surface 12 are arranged in parallel. Further, the flat container 10 has a flat cross-sectional shape in the direction orthogonal to the longitudinal direction.

Further, the distance between the inner surface of one flat surface 11 and the inner surface of the other flat surface 12, that is, the vertical dimension is not particularly limited, but is 0.50 to 2.0 mm in the flat container 10. There is. Further, the distance between the inner surface of one curved surface portion 13 and the inner surface of the other curved surface portion 14, that is, the horizontal dimension is not particularly limited as long as it exceeds the vertical dimension, but in the flat container 10. , 3.0 to 10.0 mm. The heat transport direction of the heat pipe 1 is the longitudinal direction of the flat container 10.

The flat heat pipe 1 obtains a higher heat transport amount than when the flat container 10 is installed horizontally at an angle of 15 ° to 90 ° with respect to the gravity direction in the vertical direction of the flat container 10. be able to. The inclination of the flat container 10 is preferably 15 ° to less than 90 °, more preferably 20 ° to 50 °. In addition, in FIG. 1, it is installed in a posture tilted by about 25 ° with respect to the horizontal direction (direction orthogonal to the direction of gravity).

From the above, the flat heat pipe 1 is installed in a state where one flat surface 11 and the other flat surface 12 are tilted by 15 ° to 90 ° with respect to the horizontal direction (direction orthogonal to the gravitational direction). Therefore, in FIG. 1, the flat heat pipe 1 is installed in a state where one flat surface 11 and the other flat surface 12 are tilted by about 25 ° with respect to the horizontal direction (direction orthogonal to the gravitational direction). ..

As shown in FIG. 1, in the heat radiating portion 16 of the flat heat pipe 1, the wick structure 15 is on the lower side in the gravity direction with the center line 20 of the cross section orthogonal to the longitudinal direction of the flat container 10 as a boundary. It is arranged in the area 17. The center line 20 is a virtual line at or near the center in the direction parallel to the vertical direction and in the horizontal direction. Therefore, the cross section of the flat container 10 in the direction orthogonal to the longitudinal direction has two regions (that is, a region 17 on the lower side in the gravity direction and a region 18 on the upper side in the gravity direction, which will be described later) with the center line 20 as a boundary. Exists with the same cross-sectional area. In the flat heat pipe 1, at least in the heat radiating portion 16, the region 17 on the lower side in the gravity direction is filled with the wick structure 15.

On the other hand, the wick structure 15 is not arranged in the region 18 on the upper side in the direction of gravity with the center line 20 as a boundary. The region 18 on the upper side in the direction of gravity is a space portion, and is a steam flow path 18'in which the working fluid F of the gas phase flows. Therefore, the wick structure 15 is arranged in the region of one curved surface portion 13 from the center line 20, and the region of the other curved surface portion 14 from the center line 20 is the steam flow path 18'.

As shown in FIG. 2, parts other than the heat radiating portion 16 of the flat heat pipe 1, that is, the heat receiving portion 19 and the central portion 21 also have a wick structure in the region 17 on the lower side in the gravity direction, similarly to the heat radiating portion 16. The body 15 is arranged, and the wick structure 15 is not arranged in the region 18 on the upper side in the direction of gravity. Therefore, in the flat heat pipe 1, the shape and dimensions of the wick structure 15 in the cross section perpendicular to the longitudinal direction of the flat container 10 are the same for the heat radiating portion 16, the heat receiving portion 19, and the central portion 21. ing.

The material of the flat container 10 is not particularly limited, and for example, copper can be used from the viewpoint of excellent thermal conductivity, aluminum from the viewpoint of light weight, stainless steel from the viewpoint of strength, and the like. The thickness of the wall surface of the container is not particularly limited, but is usually about 0.05 to 0.25 mm. The material of the wick structure 15 is not particularly limited, and a sintered body of metal powder such as copper powder or stainless powder, a metal mesh, or the like can be used.

The working fluid F to be sealed in the flat container 10 can be appropriately selected depending on the compatibility with the material of the flat container 10, and examples thereof include water, CFC substitutes, perfluorocarbons, and cyclopentane. be able to.

FIG. 1 and 2 relate to an example of the first embodiment in which one flat surface 11 and the other flat surface 12 of the flat container 10 are installed in a posture tilted by about 25 ° with respect to the horizontal direction. The mechanism of heat transport of the flat heat pipe 1 will be described. When the flat heat pipe 1 receives heat from a heating element (not shown) thermally connected by the heat receiving unit 19, the working fluid F undergoes a phase change from the liquid phase to the gas phase at the heat receiving unit 19. The working fluid F of the gas phase flows through the steam flow path 18'from the heat receiving portion 19 to the heat radiating portion 16 in the longitudinal direction of the flat container 10, so that the heat from the heating element flows from the heat receiving portion 19 to the heat radiating portion 16. Will be transported to. The heat from the heating element transported from the heat receiving unit 19 to the heat radiating unit 16 changes the phase of the working fluid F in the gas phase to the liquid phase in the heat radiating unit 16 provided with heat exchange means (not shown). Is released as latent heat. The latent heat released by the heat radiating unit 16 is released from the heat radiating unit 16 to the external environment of the flat heat pipe 1 by the heat exchange means provided in the heat radiating unit 16.

The working fluid F whose phase has changed to a liquid phase in the heat radiating unit 16 is taken into the wick structure 15 and returned from the heat radiating unit 16 to the heat receiving unit 19 by the capillary force of the wick structure 15. At this time, since the wick structure 15 is located in the region 17 on the lower side in the direction of gravity, the working fluid F condensed in the heat radiating portion 16 moves to the wick structure 15 by the action of gravity, and further wicks by the action of gravity. The liquid phase working fluid F moving to the structure 15 promotes the reflux of the liquid phase working fluid F in the wick structure 15. Since the region 18 on the upper side in the gravity direction is a steam flow path 18'in which the wick structure 15 is not provided at least on the heat radiation portion 16 side, the working fluid F of the gas phase is on the upper side in the gravity direction. The region 18 can be smoothly distributed from the heat receiving unit 19 to the heat radiating unit 16.

Next, the flat heat pipe according to the second embodiment of the present invention will be described with reference to the drawings. The same components as the flat heat pipe according to the first embodiment described above will be described with reference to the same reference numerals.

In the flat heat pipe 1 according to the first embodiment, the flat container 10 has one flat surface 11 and the other flat surface 12 facing one flat surface 11, and one flat surface 11 Extends on the same plane, and the other flat surface 12 facing one flat surface 11 also extends on the same plane. However, as shown in FIG. 3, instead of this, the second embodiment In the flat heat pipe 2 according to the example, one surface 31 that does not extend on the same plane and the other surface that faces the other surface 31 on the lower side in the direction of gravity and does not extend on the same plane. A flat container 30 having a surface 32 and a surface 32 is provided.

In the flat heat pipe 2 according to the second embodiment, one surface 31 has a bent portion 33 at a substantially central portion, so that the surface 31 does not extend on the same plane. One surface 31 has a first surface 34 and a second surface 35 connected to the first surface 34 with the bent portion 33 as a boundary, and the second surface 35 is in the direction of gravity. It is tilted upward by 15 ° to 90 °. In FIG. 3, the second surface 35 is inclined upward by about 25 ° in the direction of gravity. In the flat heat pipe 2, the first surface 34 extends in a direction orthogonal to the direction of gravity (horizontal direction), but is not limited to this, and is arranged along the heat radiation surface of the heating element.

Further, the other surface 32 also has a bent portion 36 at a substantially central portion like the one surface 31, so that the other surface 32 does not extend on the same plane. The other surface 32 has a first surface 37 and a second surface 38 connected to the first surface 37 with the bent portion 36 as a boundary.

In the flat heat pipe 2, a first region formed between the first surface 34 of one surface 31 and the first surface 37 of the other surface 32 and a second region of the one surface 31 It has a second region formed between a surface 35 and a second surface 38 of the other surface 32. The second region is arranged above the first region in the direction of gravity. That is, the first region forms the region 17 on the lower side in the gravity direction, and the second region forms the region 18 on the upper side in the gravity direction. Here, "upper in the direction of gravity" means that the position of the center of gravity of the second region is located above by comparing the positions of the centers of gravity of the first region and the second region in a predetermined cross section.

In FIG. 3, since the first surface 34 of one surface 31 and the first surface 37 of the other surface 32 extend in the horizontal direction, the region on the lower side in the gravity direction, which is the first region, is formed. 17 extends along the horizontal direction. Further, the second surface 35 of one surface 31 is inclined upward by 15 ° to 90 ° in the gravity direction with respect to the first surface 34 (in FIG. 3, it is inclined by about 25 ° upward in the gravity direction), and the other surface is inclined. Since the second surface 38 of the surface 32 is inclined 15 ° to 90 ° upward in the gravity direction with respect to the first surface 37 (in FIG. 3, it is inclined about 25 ° upward in the gravity direction), the gravity direction. The upper region 18 extends at an angle of 15 ° to 90 ° (in FIG. 3, about 25 ° upward in the gravity direction) with respect to the region 17 on the lower side in the gravity direction.

As shown in FIG. 3, the wick structure 15 is arranged in a region 17 on the lower side in the direction of gravity, which is a first region. In the flat heat pipe 2, the region 17 on the lower side in the direction of gravity is filled with the wick structure 15.

On the other hand, the wick structure 15 is not arranged in the second region, the region 18 on the upper side in the direction of gravity. The region 18 on the upper side in the direction of gravity is a space portion, which is a steam flow path 18'for the working fluid of the gas phase to flow.

In the flat heat pipe 2 according to the second embodiment, as in the flat heat pipe 1 according to the first embodiment, the wick structure 15 is located in the region 17 on the lower side in the direction of gravity, so that the heat radiating portion is provided. The working fluid of the liquid phase that moves to the wick structure 15 by the action of gravity and further moves to the wick structure 15 by the action of gravity causes the working fluid of the liquid phase in the wick structure 15 to move. Circulation is promoted.

Further, also in the flat heat pipe 2 according to the second embodiment, the wick structure 15 is not provided in the region 18 on the upper side in the gravity direction as in the flat heat pipe 1 according to the first embodiment. Since the steam flow path 18'is formed, the working fluid of the gas phase can smoothly flow through the region 18 on the upper side in the direction of gravity from the heat receiving portion to the heat radiating portion. Therefore, it is possible to prevent pressure loss between the flow of the working fluid in the liquid phase and the flow of the working fluid in the gas phase.

Next, another embodiment of the present invention will be described. In the first embodiment, the region 17 on the lower side in the gravity direction is filled with the wick structure 15, but the region 17 on the lower side in the gravity direction is in contact with, for example, the inner surface of one of the curved surface portions 13. The wick structure 15 may be provided, and if necessary, a part of the region 17 on the lower side in the direction of gravity (for example, the portion on the center line 20 side) becomes a space portion (steam flow path). You may. Further, in the first embodiment, the wick structure 15 is not provided in the region 18 on the upper side in the gravity direction, but the steam flow path 18'is provided in the region 18 on the upper side in the gravity direction. If necessary, the wick structure 15 may be provided in a part of the region 18 on the upper side in the direction of gravity.

In the second embodiment, the region 17 on the lower side in the gravity direction is filled with the wick structure 15, but the region 17 on the lower side in the gravity direction is filled with, for example, one curved surface portion 13 or the other surface 32. It suffices if the wick structure 15 is provided in contact with the inner surface of the first surface 37, and if necessary, a part of the region 17 on the lower side in the direction of gravity becomes a space portion (steam flow path). You may be. Further, in the second embodiment, the wick structure 15 is not provided in the region 18 on the upper side in the gravity direction, but the steam flow path 18'is provided in the region 18 on the upper side in the gravity direction. If necessary, the wick structure 15 may be provided in a part of the region 18 on the upper side in the direction of gravity.

Further, in the first embodiment, the heat receiving portion 19 and the central portion 21 also have the wick structure 15 arranged in the region 17 on the lower side in the gravity direction and in the region 18 on the upper side in the gravity direction, similarly to the heat radiating portion 16. Although the wick structure 15 was not arranged in the above, the arrangement of the wick structure 15 in the heat receiving portion 19 and the central portion 21 is not particularly limited and may be appropriately changed depending on the usage situation.

Further, in the first embodiment, the shape and dimensions of the cross section of the wick structure 15 are the same for the heat radiating portion 16, the heat receiving portion 19, and the central portion 21, but the heat radiating portion 16 is on the lower side in the gravity direction. The wick structure 15 may be arranged in the region of, and for example, the dimensions of the cross section of the wick structure 15 may gradually change in the heat radiating portion 16, the heat receiving portion 19, and the central portion 21.

In the flat container 10 of the first embodiment, the surface connected to one curved surface portion 13 and the other curved surface portion 14 is one flat surface 11 and the other flat surface 12, that is, a flat surface. However, the surface is not limited to a flat surface, and a non-flat surface having a curved surface, unevenness, a stepped portion, or the like may be used. In this case, the inclination of one flat surface 11 and the other flat surface 12 with respect to the horizontal direction is the average value of the inclination at both ends and the inclination at the center for each of the one flat surface 11 and the other flat surface 12. Calculated at.

In the flat container 30 of the second embodiment, the first surface 34 and the second surface 35 of one surface 31 and the first surface 37 and the second surface 38 of the other surface 32 are all. Although it was a flat surface, it is not limited to a flat surface, and may be a non-flat surface having a curved surface, unevenness, a stepped portion, or the like. In this case, the inclination of the second surface 35 and the second surface 38 with respect to the horizontal direction is the average value of the inclination at both ends and the inclination at the center for each of the second surface 35 and the second surface 38. Calculated at.

In the first and second embodiments, the heat pipes 1 and 2 are flat, but the cross-sectional shape of the heat pipe container is not particularly limited, and for example, a polygon such as a triangle or a quadrangle, or a round shape. It may be a rounded rectangle or the like, and therefore a non-flat heat pipe may be used.

In the flat container 10 of the first embodiment, one flat surface 11 and the other flat surface 12 are tilted by 15 ° to 90 ° with respect to the horizontal direction (direction orthogonal to the gravitational direction). Not limited to this, at least the other flat surface 12 which is a flat surface on the lower side in the gravity direction may be inclined by 15 ° to 90 ° with respect to the horizontal direction (direction orthogonal to the gravity direction).

Further, in the second embodiment, the first surface 34 of one surface 31 and the first surface 37 of the other surface 32, the second surface 35 of one surface 31 and the second surface 32 of the other surface 32. The two surfaces 38 are formed in parallel with each other, but the present invention is not limited to this, and at least the second surface 38 of the other surface 32 may be inclined upward by 15 ° to 90 ° in the direction of gravity.

Next, examples of the present invention will be described. Here, a case where the flat heat pipe 1 according to the first embodiment of the present invention is used will be described as an example. The present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

As shown in FIGS. 4 and 5, the flat heat pipe 1 according to the first embodiment of the present invention is placed on the plate-shaped heat insulating material, and further, on the flat heat pipe 1 placed on the heat insulating material. A heater was installed in. In this embodiment, the dimensions of the flat container 10 are 10 mm in the horizontal direction and 2 mm in the vertical direction, and the horizontal dimensions of the wick structure which is a metal mesh are 4 mm.

As shown in FIG. 4, the flat heat pipe 1 is arranged horizontally (0 °) with respect to the flat surface of the flat container 10 (Comparative Example 1, (a)) and 11 ° (Comparative Example). 2, (b)), 22 ° (Fig. 1, (c)), 45 ° (Fig. 2, (d)), the flattened heat pipe 1 is flattened. The surface temperature of the mold container 10 was measured.

Further, as shown in FIG. 5, the surface temperature of the flat heat pipe 1 arranged at each angle was measured at six points by a thermocouple. Of these, the temperature measurement position of the flat heat pipe 1 closest to the fan is 250 mm from one end of the flat heat pipe 1 (position of (0) in FIG. 5) (position of (6) in FIG. 5). Position), as the temperature measurement position of the flat heat pipe 1 farthest from the fan, a position 50 mm from the position (0) of the flat heat pipe 1 (the end of the heat pipe) (the position of (1) in FIG. 5). A thermocouple was installed in each. Further, between the position (6) and the position (1), that is, 200 mm (position (5) in FIG. 5), 180 mm (position (4) in FIG. 5), 150 mm from one end. Thermocouples were installed at positions (position (3) in FIG. 5) and 100 mm (position (2) in FIG. 5), respectively.

For the flat heat pipes 1 arranged at each angle, the heater and the fan were operated so that the temperature at the position (6) was 180 ° C., and were installed at the above positions (1) to (6) at that time. The temperature measurement results of each thermocouple are shown in FIGS. 6 (a) and 6 (b).

As shown in FIGS. 6 (a) and 6 (b), in the second embodiment in which the flat heat pipe 1 is tilted at an angle of 45 °, the temperature of the flat heat pipe 1 at the position (6) closest to the fan The difference between the temperature and the temperature of the flat heat pipe 1 at the position (1) farthest from the fan is less than 40 ° C., and in Example 1 in which the flat heat pipe 1 is tilted at an angle of 22 °, it is closest to the fan ( The difference between the temperature of the flat heat pipe 1 at the position 6) and the temperature of the flat heat pipe 1 at the position (1) farthest from the fan was reduced to less than 50 ° C., respectively. Therefore, in the flat heat pipe 1 installed in a posture inclined at an angle of 22 ° and 45 °, a good heat transport amount was obtained, and excellent heat transport characteristics were obtained.

On the other hand, in Comparative Example 1 in which the flat heat pipe 1 is arranged horizontally and Comparative Example 2 in which the flat heat pipe 1 is tilted at an angle of 11 °, both the flat heat pipe 1 at the position (6) The difference between the temperature of (1) and the temperature of the flat heat pipe 1 at the position (1) is close to 60 ° C. Therefore, in the flat heat pipe 1 installed in a horizontal and tilted posture at an angle of 11 °, the heat transport amount is reduced as compared with Examples 1 and 2, and the excellent heat transport characteristics are excellent. I couldn't get it.

Since the heat pipe of the present invention is installed in an inclined posture and exhibits excellent heat transport characteristics, for example, it is mounted in a field for cooling a heating element such as an electronic component provided in a narrow space or at a high density. It has high utility value in the field of cooling heating elements such as electronic parts.

1, 2 Flat heat pipes 10, 30 Flat container 11 One flat surface 12 The other flat surface 15 Wick structure 16 Heat dissipation part 17 Area on the lower side in the direction of gravity 18 Area on the upper side in the direction of gravity 20 Center line 31 One Surface 32 Another surface 34 First surface 35 Second surface 37 First surface 38 Second surface

Claims (1)

Tubular container and
The wick structure arranged in the container and
A heat pipe having a working fluid sealed in the container and having a heat transport direction in the longitudinal direction.
The cross section in the direction orthogonal to the longitudinal direction has a first region in which the wick structure is arranged and a second region having a steam flow path, with the center line of the cross section as a boundary.
The second region is arranged above the first region in the direction of gravity.
The inner surface of the container on the lower side in the gravity direction in the second region is tilted by 20 ° to 50 ° with respect to the direction orthogonal to the gravity direction.
The wick structure is arranged over the entire first region.
A heat pipe in which the condensed working fluid moves from the second region to the wick structure by the action of gravity.

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