JP7459741B2 - Heat Transport Device - Google Patents

Description

The technology disclosed in this application relates to a heat transport device.

In recent years, heat transport devices called heat pipes have been used. For example, the heat pipe described in Patent Document 1 includes a container having a sealed internal space, a wick structure provided on the inner surface of the container, and a working fluid sealed in the internal space of the container.

For example, the loop heat pipe described in Patent Document 2 includes an evaporator, a condenser that radiates heat and liquefies the working fluid vaporized in the evaporator, and a working fluid that is vaporized in the evaporator to the condenser. It is equipped with a steam pipe to send the steam and a liquid pipe to send the working fluid liquefied in the condenser to the evaporator.

Although it is not a heat transport device, Patent Document 3 discloses a technology related to a maneuverable light balloon having a variable buoyancy force.

JP 2020-79699 A Japanese Patent Application Publication No. 2012-37097 International Publication No. 2001/042082

The technologies described in the above-mentioned Patent Documents 1 and 2 have the following problems. That is, in the heat pipe described in Patent Document 1, the piping called the container is made of a hard body such as metal. For this reason, the degree of freedom in designing the piping is low, and the installation work of the heat pipe is difficult.

In addition, the loop heat pipe described in Patent Document 2 is difficult to transport because the evaporator and condenser are independent of each other and are connected by a vapor pipe and a liquid pipe.

Note that the technology related to a maneuverable light balloon with variable buoyancy described in Patent Document 3 does not have a function as a heat transport device using a hydraulic fluid.

The technology disclosed in the present application has been made in view of the above problems, and one aspect thereof is to provide a heat transport device that is easy to install and transport while increasing the degree of freedom in piping design. The purpose is to

A first aspect of the technology disclosed in the present application provides a pipe having a heat receiving part connected to a heating element, a heat radiating part connected to a cooling body, a peripheral wall part connecting the heat receiving part and the heat radiating part, and the pipe. and a working fluid that is sealed inside and transports heat from the heat receiving part to the heat radiating part with a phase change, and the peripheral wall part includes a plurality of panels and a plurality of hinge parts connecting the plurality of panels. The piping is a heat transport device that has flexibility and expands from a contracted state with deformation of the peripheral wall.
A second aspect of the technology disclosed in the present application is a heat transport device comprising: a pipe having a heat receiving portion connected to a heat generating body, a heat dissipating portion connected to a cooling body, and a peripheral wall portion connecting the heat receiving portion and the heat dissipating portion; and a working fluid sealed inside the pipe and transporting heat from the heat receiving portion to the heat dissipating portion by undergoing a phase change, wherein the peripheral wall portion is soft, flexible or elastic, and the pipe expands from a contracted state by undergoing deformation of the peripheral wall portion, the heat transport device comprising an expansion means for expanding the pipe from the contracted state by undergoing deformation of the peripheral wall portion, the expansion means including a tank for storing the working fluid, and a conveying device for feeding and discharging the working fluid between the tank and the pipe.
A third aspect of the technology disclosed in the present application provides a pipe having a heat receiving part connected to a heating element, a heat radiating part connected to a cooling body, a peripheral wall part connecting the heat receiving part and the heat radiating part, and the pipe. and a working fluid that is sealed inside and transports heat from the heat receiving part to the heat radiating part with a phase change, the peripheral wall part has softness, flexibility, or elasticity, and the piping is The heat transport device expands from the contracted state with the deformation of the peripheral wall, and the heat transport device includes an expansion means that expands the pipe from the contracted state with the deformation of the peripheral wall, and the expansion means expands the pipe from the contracted state with the deformation of the peripheral wall. The heat transport device includes a first biasing member that biases the peripheral wall portion in a direction in which the piping expands.
A fourth aspect of the technology disclosed in the present application is a heat transport device comprising: a pipe having a heat receiving portion connected to a heat generating body, a heat dissipation portion connected to a cooling body, and a peripheral wall portion connecting the heat receiving portion and the heat dissipation portion; and a working fluid sealed inside the pipe and transporting heat from the heat receiving portion to the heat dissipation portion by undergoing a phase change, wherein the peripheral wall portion is soft, flexible or stretchable, the pipe expands from a contracted state by undergoing deformation of the peripheral wall portion, and the heat transport device comprises an expansion means for expanding the pipe from the contracted state by undergoing deformation of the peripheral wall portion, and the expansion means includes a second biasing member for biasing the peripheral wall portion in the direction in which the pipe contracts.

The heat transport device according to one aspect of the technology disclosed in this application increases the freedom of piping design while facilitating installation and transportation.

FIG. 1 is a diagram showing a heat transport device according to a first embodiment of the technology disclosed in the present application. 2 is a cross-sectional view of the piping shown in FIG. 1. FIG. It is a figure showing the heat transport device concerning the second embodiment of the technique disclosed by this application. FIG. 7 is a diagram showing piping according to a third embodiment of the technology disclosed in the present application. 5 is a diagram showing a modification of the piping shown in FIG. 4. FIG. FIG. 13 is a diagram showing piping according to a fourth embodiment of the technology disclosed in the present application. FIG. 13 is a diagram showing a heat transport device according to a fifth embodiment of the technology disclosed in the present application. It is a figure showing the heat transport device concerning a sixth embodiment of the technique disclosed in this application. FIG. 13 is a diagram showing a heat transport device according to a seventh embodiment of the technology disclosed in the present application. 13 is a diagram showing a heat transport device according to an eighth embodiment of the technology disclosed in the present application. FIG. It is a figure showing piping concerning a ninth embodiment of a technique disclosed in this application. FIG. 10 is a diagram showing piping according to a tenth embodiment of the technology disclosed in the present application.

[First embodiment]
First, a first embodiment of the technology disclosed in the present application will be described.

FIG. 1 is a diagram showing a heat transport device 10 according to a first embodiment of the technology disclosed in the present application. In FIG. 1, the heat transport device 10 is shown in a front cross-sectional view. The heat transport device 10 functions as a so-called heat pipe. In the first embodiment, an example will be described in which the heat transport device 10 transports heat from a heat generating body 12 to a cooling body 14 to cool the heat generating body 12.

The heating element 12 may be of any type as long as it generates heat, such as a CPU (Central Processing Unit). The cooling body 14 is, for example, a heat sink, but any type of cooling body may be used as long as it is cooled by a refrigerant such as liquid or gas. This heat transport device 10 includes piping 16 and a working fluid 18 in order to transport the heat of the heating element 12 to the cooling element 14.

The pipe 16 has a heat receiving section 20 connected to the heating element 12, a heat dissipation section 22 connected to the cooling element 14, and a peripheral wall section 24 connecting the heat receiving section 20 and the heat dissipation section 22. The heat receiving section 20 forms one axial end of the pipe 16, and the heat dissipation section 22 forms the other axial end of the pipe 16. The pipe 16 is sealed by the heat receiving section 20, the heat dissipation section 22, and the peripheral wall section 24. In other words, the pipe 16 is a sealed cylindrical bag.

The entire piping 16, including the peripheral wall portion 24, is formed of a soft material such as vinyl, so that the entire peripheral wall portion 24 is soft. The softness of the peripheral wall portion 24 allows it to deform in the radial direction in a manner different from thermal expansion. In other words, the peripheral wall portion 24 is capable of deforming in the radial direction with deformation due to its softness.

The pipe 16 is configured to expand from the contracted state with expansion and deformation of the peripheral wall 24 in the radial direction, and to contract from the expanded state with the contraction and deformation of the peripheral wall 24 in the radial direction. FIG. 1(A) shows a state in which the pipe 16 is contracted, and FIG. 1(B) shows a state in which the pipe 16 is expanded. Moreover, FIG. 2 is a cross-sectional view of the piping 16 shown in FIG. is shown in an expanded state.

In the first embodiment, the expansion deformation of the peripheral wall portion 24 in the radial direction specifically refers to a deformation in which the peripheral wall portion 24 expands in the radial direction from a radially deflated state. Moreover, the contraction deformation of the peripheral wall part 24 in the radial direction specifically means that the peripheral wall part 24 deforms from the above-described expanded state to a deflated state in the radial direction.

As shown in FIGS. 1 and 2, the volume of the pipe 16 increases or decreases as the peripheral wall portion 24 expands and contracts. It is desirable that the volume of the pipe 16 expands to more than twice the volume when it contracts. The shape of the peripheral wall portion 24 when the pipe 16 is expanded is, for example, a cylindrical shape.

As shown in FIG. 1, in the first embodiment, as an example, the heating element 12 is located vertically below the cooling element 14, and correspondingly, the heat receiving portion 20 is located vertically below the heat dissipation portion 22. The positions of the heating element 12 and the cooling element 14 are fixed, for example. When the heat receiving portion 20 is connected to the heating element 12 and the heat dissipation portion 22 is connected to the cooling element 14, the piping 16 is arranged to extend with the vertical direction as its axial direction.

FIG. 1(A) shows a state in which the heating element 12 has stopped generating heat (a state in which the temperature of the heating element 12 has decreased), and FIG. 1(B) shows a state in which the heating element 12 is generating heat. The condition is shown. The working fluid 18 is sealed inside the pipe 16. As shown in FIG. 1A, when the heating element 12 stops generating heat, the working fluid 18 sealed inside the pipe 16 accumulates at the lower part of the pipe 16 due to its own weight and comes into contact with the heat receiving part 20. The working fluid 18 is, for example, water or a fluorocarbon substitute. However, the types of hydraulic fluid 18 are not limited to these.

As shown in FIG. 1(B), when the heating element 12 generates heat, the working fluid 18 is heated by the heat 13 of the heating element 12. Then, as the temperature of the working fluid 18 rises, the pressure inside the pipe 16 rises, and as a result, the pipe 16 expands from a contracted state accompanied by radial expansion deformation of the peripheral wall portion 24. In this way, in the first embodiment, the pipe 16 expands by adopting a structure in which the working fluid 18 is sealed in the sealed pipe 16. This structure in which the working fluid 18 is sealed in the sealed pipe 16 corresponds to the expansion means 26 that expands the pipe 16 from a contracted state accompanied by radial expansion deformation of the peripheral wall portion 24.

On the other hand, as shown in FIG. 1A, when the heating element 12 stops generating heat and the temperature of the heating element 12 decreases, the pressure inside the pipe 16 decreases as the temperature of the working fluid 18 decreases. As a result, the pipe 16 is contracted from the expanded state as the peripheral wall portion 24 is contracted and deformed in the radial direction. In other words, the expansion means 26 not only has the function of expanding the pipe 16 from the contracted state by radially contracting and deforming the peripheral wall 24, but also expands the pipe 16 by radially contracting and deforming the peripheral wall 24. It has the function of deflating from an expanded state.

Next, we will explain the heat transport method according to the first embodiment.

The heat transport method according to the first embodiment is carried out using the heat transport device 10 described above. In the heat transport method according to the first embodiment, first, as shown in FIG. 1(A), the heat transport device 10 is transported to the heating body 12 and the cooling body 14, which are in a state where heat generation has stopped. At this time, the heat transport device 10 is in a state where the piping 16 is contracted.

Subsequently, with the heat generating element 12 stopping generating heat, the heat receiving part 20 is connected to the heat generating element 12, and the heat radiating part 22 is connected to the cooling body 14. When the heating element 12 stops generating heat, the working fluid 18 sealed inside the pipe 16 accumulates at the lower part of the pipe 16 due to its own weight and comes into contact with the heat receiving section 20 .

Then, as shown in FIG. 1(B), when the heating element 12 generates heat, the heat 13 of the heating element 12 is transmitted to the heat receiving part 20, and the working fluid 18 in contact with the heat receiving part 20 is heated. When the working fluid 18 is heated in this manner, the working fluid 18 changes from a liquid phase to a gas phase, and steam 28 is generated. Further, at this time, the pressure inside the pipe 16 increases as the temperature of the working fluid 18 rises, and as a result, the pipe 16 expands from its contracted state with expansion deformation of the peripheral wall portion 24 in the radial direction.

When the steam 28 generated inside the pipe 16 reaches the heat dissipation section 22, the heat 29 of the steam 28 is transferred to the cooling body 14 via the heat dissipation section 22. As a result, the heat 29 of the steam 28 is released to the heat dissipation section 22. In addition, when the heat 29 of the steam 28 is released to the heat dissipation section 22, the steam 28 changes from the gas phase to the liquid phase, and the steam 28 condenses into droplets 30. The droplets 30 fall under their own weight.

By repeating the above operations, heat is transported from the heat receiving section 20 to the heat radiating section 22 with a phase change of the working fluid 18 by a so-called thermosiphon method. Thereby, the heat of the heat generating body 12 is transported to the cooling body 14 by the heat transport device 10, and the heat generating body 12 is cooled.

As shown in FIG. 1(A), when the heating element 12 stops generating heat and the temperature of the heating element 12 drops, the pressure inside the pipe 16 drops with the drop in temperature of the working fluid 18, causing the pipe 16 to shrink from its expanded state with the peripheral wall portion 24 shrinking and deforming in the radial direction.

Next, the operation and effects of the first embodiment will be explained.

As described above in detail, in the heat transport device 10 according to the first embodiment, the pipes 16 are flexible rather than rigid. Therefore, there is a high degree of freedom in designing the pipes 16 compared to, for example, when the pipes 16 are made of a rigid body. In other words, when the pipes 16 are made of a rigid body, it is difficult to freely design the contraction and expansion forms of the pipes 16 and the material of the pipes 16. However, in the heat transport device 10 according to the first embodiment, the pipes 16 are made of a rigid body, so that it is possible to freely design the contraction and expansion forms of the pipes 16 and the material of the pipes 16.

In addition, in the heat transport device 10 according to the first embodiment, since the piping 16 is flexible, the heat transport device 10 can be made smaller in the axial and radial directions of the piping 16 when transporting the heat transport device 10. This makes it easier to transport the heat transport device 10 to the heating element 12 and cooling element 14 when heat generation has stopped. In addition, since the piping 16 is flexible, the piping 16 can be bent, for example, which makes it easier to connect the heat receiving part 20 to the heating element 12 and the heat dissipating part 22 to the cooling element 14.

In addition, in the heat transport device 10 according to the first embodiment, the peripheral wall portion 24 is flexible and can deform in the radial direction. Therefore, when the peripheral wall portion 24 is in a state where it expands and deforms in the radial direction, the flow path through which the steam 28 passes is expanded, so that the steam 28 can be moved from the heat receiving portion 20 to the heat dissipating portion 22 with low fluid resistance. This improves the heat transport efficiency, and therefore the cooling performance for the heat generating body 12.

In addition, in the heat transport device 10 according to the first embodiment, the piping 16 contracts from an expanded state with the peripheral wall portion 24 contracting and deforming. Therefore, when the heat transport device 10 is not in use, the size of the heat transport device 10 can be reduced.

In addition, in the heat transport device 10 according to the first embodiment, the heat receiving section 20 is located vertically below the heat dissipation section 22. Therefore, when the steam 28 changes from the gas phase to the liquid phase and the steam 28 condenses into droplets 30, the droplets 30 fall by their own weight, so there is no need to provide a capillary force generating section such as a wick or narrow groove on the inner surface of the peripheral wall section 24 to transport the droplets 30 to the heat receiving section 20. This prevents the contraction of the peripheral wall section 24 from being hindered, ensuring the contraction property of the peripheral wall section 24, and prevents an increase in the number of parts, thereby preventing an increase in costs.

In addition, in the heat transport device 10 according to the first embodiment, the entire pipe 16 including the peripheral wall portion 24 is formed of a soft material and has flexibility, so that the pipe 16 expands. and has a retractable configuration. Therefore, since the piping 16 has a simple configuration, an increase in cost can be prevented.

Further, the heat transport device 10 according to the first embodiment includes an expansion means 26 that expands the pipe 16 from the contracted state by expanding and deforming the peripheral wall portion 24 in the radial direction. This expansion means 26 is realized by a structure in which a hydraulic fluid 18 is sealed in a sealed pipe 16. Therefore, since it is not necessary to use, for example, an actuator as the expansion means 26, it is possible to prevent an increase in the number of parts and costs.

In addition, due to the structure in which the working fluid 18 is sealed in the sealed pipe 16, when the heating element 12 stops generating heat and the temperature of the heating element 12 drops, the pressure inside the pipe 16 drops, causing the pipe 16 to contract from its expanded state. Therefore, since the expansion means 26 described above has the function of expanding the pipe 16 from its contracted state, as well as the function of contracting the pipe 16 from its expanded state, an increase in the number of parts can be prevented, thereby preventing costs from increasing.

In the above-described first embodiment, the peripheral wall portion 24 has softness because it is entirely formed of a soft material, but it has softness because only a part of it is formed of a soft material. may have.

The heat receiving section 20 and the heat dissipating section 22 may also be made of a material different from that of the peripheral wall section 24.

[Second embodiment]
Next, a second embodiment of the technology disclosed in the present application will be described.

FIG. 3 is a diagram showing a heat transport device 10 according to a second embodiment of the technology disclosed in the present application. In FIG. 3, the configuration of the half of the heat transport device 10 on the heat receiving section 20 side is shown in a front sectional view. FIG. 3(A) shows a state in which the pipe 16 is contracted, and FIG. 3(B) shows a state in which the pipe 16 is expanded.

In the second embodiment, the configuration of the heat transport device 10 is changed from the first embodiment (see FIGS. 1 and 2) as follows. That is, the heat receiving part 20 formed at the lower part of the pipe 16 is formed in a container shape. The heat receiving part 20 formed in the shape of a container is made of a material different from that of the peripheral wall part 24, that is, for example, a hard material. The peripheral wall portion 24 of the pipe 16 is made of a soft material.

Also in this second embodiment, the pipe 16 expands from its contracted state as the peripheral wall portion 24 expands and deforms. Further, the pipe 16 contracts from the expanded state as the peripheral wall portion 24 contracts and deforms. In the second embodiment, the other configurations of the heat transport device 10 are the same as those in the first embodiment.

In this second embodiment, the heat receiving portion 20 formed at the bottom of the pipe 16 is formed in a container shape. Therefore, as shown in FIG. 3(A), even when the peripheral wall portion 24 is in a contracted state, the volume of the heat receiving portion 20 is secured. This makes it possible to secure the area of the region where the working fluid 18 stored in the heat receiving portion 20 and the heating element 12 are thermally connected.

As shown in FIG. 3(B), when the heating element 12 generates heat, the heat 13 of the heating element 12 can be efficiently transferred to the working fluid 18, so that the steam 28 can be efficiently generated. Thereby, heat transport efficiency can be improved.

In the second embodiment described above, the peripheral wall portion 24 is flexible because the entire portion is made of a flexible material, but it may be flexible because only a portion of the peripheral wall portion 24 is made of a flexible material.

In addition, in the second embodiment described above, the heat receiving portion 20 is formed from a material different from that of the peripheral wall portion 24, and the heat dissipation portion 22 (see FIG. 1) may also be formed from a material different from that of the peripheral wall portion 24.

[Third embodiment]
Next, a third embodiment of the technology disclosed in the present application will be described.

Figure 4 is a diagram showing a pipe 16 according to a third embodiment of the technology disclosed in the present application. In Figure 4, the pipe 16 is shown in a cross-sectional view. Figure 4(A) shows the pipe 16 in a contracted state, and Figure 4(B) shows the pipe 16 in an expanded state.

In the third embodiment, the configuration of the piping 16 is changed from the first embodiment (see FIGS. 1 and 2) as follows. That is, the peripheral wall portion 24 of the pipe 16 includes a plurality of panels 32 and a plurality of hinge portions 34 that connect the plurality of panels 32. The peripheral wall portion 24 is formed into an annular (cylindrical) shape by having a plurality of panels 32 and a plurality of hinge portions 34 .

The panels 32 may be made of a hard body or a soft body. The panels 32 may also have elasticity. The hinge portions 34 connect adjacent panels 32 so that they can be bent. The multiple hinge portions 34 may be made of a material separate from the multiple panels 32, or may be formed integrally with the multiple panels 32. The multiple hinge portions 34 are formed, for example, of thin-walled portions that are thinner than the plate thickness of the multiple panels 32.

The peripheral wall portion 24 has flexibility by having a plurality of panels 32 and a plurality of hinge portions 34 connecting the plurality of panels 32. This peripheral wall portion 24 is flexible and can be deformed in the radial direction in a deformation mode different from thermal expansion. In other words, the peripheral wall portion 24 is flexible and can be deformed in the radial direction. The pipe 16 expands from the contracted state as the peripheral wall 24 expands and deforms in the radial direction, and contracts from the expanded state as the peripheral wall 24 contracts and deforms in the radial direction.

In this third embodiment, in order to ensure radial deformation of the peripheral wall portion 24, for example, the connection portion between the peripheral wall portion 24 and the heat receiving portion 20 and the heat dissipation portion 22 (see FIG. 1), or the heat receiving portion 20 and the heat dissipation portion 22 (see FIG. 1) connected to the peripheral wall portion 24 may be soft or stretchable.

In this third embodiment, the peripheral wall portion 24 is flexible and can be deformed in the radial direction. Therefore, when the peripheral wall portion 24 expands and deforms in the radial direction, the flow path through which the steam 28 passes expands, as in the first embodiment (see FIG. 1), so that the steam 28 is transferred to the heat receiving portion 20 with low fluid resistance. It can be moved from there to the heat dissipation section 22. Thereby, the heat transport efficiency can be improved, so that the cooling performance for the heating element 12 can be improved.

In addition, in the third embodiment, the peripheral wall portion 24 has flexibility by having a plurality of panels 32 and a plurality of hinge portions 34 connecting the plurality of panels 32, and this allows the piping 16 to be configured to be expandable and contractible. Therefore, since the piping 16 has a simple configuration, it is possible to prevent an increase in costs.

FIG. 5 is a diagram showing a modified example of the piping 16 shown in FIG. 4. FIG. 5(A) shows the piping 16 in a contracted state, and FIG. 5(B) shows the piping 16 in an expanded state. As shown in FIG. 5(A), the piping 16 may be contracted by being wound into a roll. Also, as shown in FIG. 5, the number of the panels 32 and the number of the hinge portions 34 may be changed as appropriate so that the piping 16 contracts in a desired form.

Further, in the third embodiment described above, the peripheral wall portion 24 has flexibility because it is entirely formed by the plurality of panels 32 and the plurality of hinge portions 34, but only a portion thereof is formed by the plurality of panels 32 and the plurality of hinge portions 34. It may have flexibility by being formed of a plurality of hinge parts 34.

In addition, in the third embodiment described above, the multiple panels 32 are formed in a flat plate shape, so that the shape of the peripheral wall portion 24 becomes a polygonal tube when the piping 16 is inflated, but the multiple panels 32 may be formed in a curved shape so that the shape of the peripheral wall portion 24 becomes a cylinder when the piping 16 is inflated.

[Fourth embodiment]
Next, a fourth embodiment of the technology disclosed in this application will be described.

Figure 6 is a diagram showing a pipe 16 according to a fourth embodiment of the technology disclosed in the present application. In Figure 6, the pipe 16 is shown in a cross-sectional view. Figure 6(A) shows the pipe 16 in a contracted state, and Figure 6(B) shows the pipe 16 in an expanded state.

In the fourth embodiment, the configuration of the piping 16 is changed from the first embodiment (see FIGS. 1 and 2) as follows. That is, the peripheral wall portion 24 of the pipe 16 is made of a stretchable material and has stretchability. The peripheral wall portion 24 is made of a stretchable material, such as synthetic rubber. Since the peripheral wall portion 24 has elasticity, it can be deformed in the radial direction in a deformation mode different from thermal expansion. That is, the peripheral wall portion 24 can be deformed in the radial direction with deformation (expandable deformation) due to its elasticity. The pipe 16 expands from the contracted state as the peripheral wall 24 expands and deforms in the radial direction, and contracts from the expanded state as the peripheral wall 24 contracts and deforms in the radial direction.

In this fourth embodiment, the heat receiving section 20 and the heat dissipating section 22 (see FIG. 1) may be formed integrally with the peripheral wall section 24 using an elastic material, or may be formed using a material different from that of the peripheral wall section 24.

In this fourth embodiment, the peripheral wall portion 24 is elastic and can deform in the radial direction. Therefore, when the peripheral wall portion 24 is in a state of radial expansion and deformation, the flow path through which the steam 28 passes is expanded, as in the first embodiment (see FIG. 1), so that the steam 28 can be moved from the heat receiving portion 20 to the heat dissipating portion 22 with low fluid resistance. This improves the heat transport efficiency, and therefore the cooling performance for the heat generating body 12.

In addition, in the fourth embodiment, the peripheral wall portion 24 is made of an elastic material and has elasticity, which allows the piping 16 to expand and contract. Therefore, the piping 16 has a simple configuration, which prevents an increase in costs.

In addition, in the above-mentioned fourth embodiment, the peripheral wall part 24 has elasticity because it is entirely formed of a stretchable material, but it has elasticity because only a part of it is formed of a stretchable material. may have.

[Fifth embodiment]
Next, a fifth embodiment of the technology disclosed in the present application will be described.

FIG. 7 is a diagram showing a heat transport device 10 according to a fifth embodiment of the technology disclosed in the present application. In FIG. 7, the configuration of the half of the heat transport device 10 on the heat receiving section 20 side is shown in a front sectional view. FIG. 7(A) shows a state in which the pipe 16 is contracted, and FIG. 7(B) shows a state in which the pipe 16 is expanded.

In the fifth embodiment, the configuration of the heat transport device 10 is changed from the second embodiment (see FIG. 3) as follows. That is, the expansion means 26 includes a tank 36 that stores the hydraulic fluid 18, a pipe 38 that connects the tank 36 and the piping 16, and a transfer device 40 that transports the hydraulic fluid 18 in and out between the tank 36 and the piping 16. A control section 42 that controls the transport device 40 is provided.

The conveying device 40 is configured to be capable of conveying the hydraulic fluid 18 from the tank 36 to the pipe 16, and also capable of conveying the hydraulic fluid 18 from the pipe 16 to the tank 36. As a result, the expansion means 26 has the function of expanding the pipe 16 from a contracted state, as well as the function of contracting the pipe 16 from an expanded state.

Specifically, the conveying device 40 is provided in the pipe 38. The conveying device 40 has, as an example, a pump 44 and a valve 46. The pump 44 is a bidirectional pump, and can be switched between an operating state for conveying the hydraulic fluid 18 from the tank 36 to the piping 16 and an operating state for conveying the hydraulic fluid 18 from the piping 16 to the tank 36. The valve 46 operates to adjust the flow rate of the hydraulic fluid 18 flowing through the pipe 38 and to open and close the internal flow path of the pipe 38.

The control unit 42 is configured by a computer having a processor, memory, etc., and is electrically connected to the conveying device 40. This control unit 42 has the function of controlling the conveying device 40.

In the heat transport device 10 according to the fifth embodiment, the hydraulic fluid 18 is stored in the tank 36 when the heat generating element 12 stops generating heat, as shown in FIG. 7(A). In this state, the pressure inside the pipe 16 is reduced, so the pipe 16 is in a contracted state.

On the other hand, as shown in FIG. 7(B), when the heating element 12 generates heat, the conveying device 40 conveys the working fluid 18 from the tank 36 to the pipe 16. Then, when the heating element 12 generates heat while the working fluid 18 is being conveyed to the pipe 16, the working fluid 18 is heated and steam 28 is generated, causing the pressure inside the pipe 16 to rise. As a result, the pipe 16 expands from a contracted state, accompanied by radial expansion and deformation of the peripheral wall portion 24.

Also, as shown in FIG. 7(A), when the heating element 12 stops generating heat and the temperature of the heating element 12 drops, the pressure inside the pipe 16 drops with the drop in temperature of the working fluid 18, causing the pipe 16 to contract from its expanded state with the peripheral wall portion 24 contracting and deforming in the radial direction. At this time, the working fluid 18 is transported from the pipe 16 to the tank 36 by the transport device 40, and the working fluid 18 is stored in the tank 36.

In this way, in the heat transport device 10 according to the fifth embodiment, the transport device 40 can transport the working fluid 18 between the tank 36 and the piping 16.

In the fifth embodiment described above, the control unit 42 may control the conveying device 40 so that the amount of working fluid 18 supplied to the pipe 16 is adjusted appropriately according to the temperature of the heating element 12 when the heating element 12 is generating heat. This makes it possible to prevent, for example, a situation in which the temperature of the working fluid 18 does not increase due to an excessive amount of working fluid 18, making it difficult to generate steam 28, and therefore prevents a decrease in the cooling efficiency of the heating element 12.

Further, the control unit 42 may control the conveying device 40 according to various conditions so that the amount of the working fluid 18 inside the pipe 16 is adjusted when the heating element 12 is generating heat. . Thereby, the diameter of the pipe 16 may be changed to vary the fluid resistance inside the pipe 16, thereby controlling the heat transport capacity of the heat transport device 10.

[Sixth embodiment]
Next, a sixth embodiment of the technology disclosed in the present application will be described.

FIG. 8 is a diagram showing a heat transport device 10 according to a sixth embodiment of the technology disclosed in the present application. In FIG. 8, the heat transport device 10 is shown in a front sectional view. FIG. 8(A) shows a state in which the pipe 16 is contracted, and FIG. 8(B) shows a state in which the pipe 16 is expanded.

In the sixth embodiment, the configuration of the heat transport device 10 is modified as follows from the first embodiment (see Figures 1 and 2). That is, the expansion means 26 includes multiple biasing members 48, 50, 52. The multiple biasing members 48, 50, 52 are configured to bias the peripheral wall portion 24 in the direction in which the pipe 16 expands, and are formed, for example, of a shape memory alloy or an elastic member. When the multiple biasing members 48, 50, 52 are formed of a shape memory alloy, the shape memory alloy is configured to deform, for example, in response to a change in temperature or magnetic field.

In this manner, in the heat transport device 10 according to the sixth embodiment, the peripheral wall portion 24 can be expanded and deformed by the plurality of urging members 48, 50, and 52. Thereby, the flow path through which the steam 28 passes can be forcibly expanded.

Note that in the sixth embodiment described above, the plurality of biasing members 48, 50, and 52 may be attached to the peripheral wall portion 24, or may constitute a part of the peripheral wall portion 24. Further, in the example shown in FIG. 8, as an example, the plurality of biasing members 48, 50, 52 are arranged in line in the axial direction of the peripheral wall portion 24, but the plurality of biasing members 48, 50, 52 are , may be arranged in any way. The number of biasing members 48, 50, 52 may be any number, and the expansion means 26 may have only one biasing member.

Further, for example, when the plurality of biasing members 48, 50, 52 are formed of a shape memory alloy that deforms due to changes in temperature or magnetic field that are different from each other, some of the plurality of biasing members 48, 50, 52 may The biasing member may be configured to bias the peripheral wall portion 24 in a direction in which the pipe 16 expands, and the remaining biasing members may be configured to bias the peripheral wall portion 24 in a direction in which the pipe 16 contracts. In this way, when the expansion means 26 includes a biasing member that urges the peripheral wall portion 24 in the direction in which the pipe 16 contracts, the expansion means 26 is added with a function of contracting the pipe 16 from the expanded state. Can be done.

As described above, the plurality of urging members 48, the urging member that urges the peripheral wall portion 24 in the direction in which the piping 16 expands, and the urging member that urges the peripheral wall portion 24 in the direction that the piping 16 contracts, 50 and 52, the biasing member that biases the peripheral wall portion 24 in the direction in which the piping 16 expands corresponds to an example of a “first biasing member”, and the biasing member that biases the peripheral wall portion 24 in the direction in which the piping 16 contracts. The biasing member that biases corresponds to an example of a "second biasing member."

In addition, in the sixth embodiment described above, the diameter of the pipe 16 may be changed by the multiple biasing members 48, 50, 52 to vary the fluid resistance inside the pipe 16 and control the heat transport capacity of the heat transport device 10.

[Seventh embodiment]
Next, a seventh embodiment of the technology disclosed in this application will be described.

FIG. 9 is a diagram showing a heat transport device 10 according to a seventh embodiment of the technology disclosed in the present application. In FIG. 9, the heat transport device 10 is shown in a front view. FIG. 9(A) shows a state in which the pipe 16 is contracted, and FIG. 9(B) shows a state in which the pipe 16 is expanded.

In the seventh embodiment, the configuration of the heat transport device 10 is changed from the first embodiment (see FIGS. 1 and 2) as follows. That is, the expansion means 26 includes a plurality of pulleys 54 provided on the outer peripheral surface of the peripheral wall 24, a wire 56 stretched around the outer peripheral surface of the peripheral wall 24 by being passed around the plurality of pulleys 54, and a wire 56 that is stretched around the outer peripheral surface of the peripheral wall 24. 56, and a control section 60 that controls the winding device 58.

The control unit 60 is configured by a computer having a processor, memory, etc., and is electrically connected to the winding device 58. This control unit 60 has the function of controlling the winding device 58.

In the seventh embodiment, when the heating element 12 generates heat with the wire 56 loosened, the pressure inside the pipe 16 increases, causing the pipe 16 to expand from its contracted state. On the other hand, when the wire 56 is wound up by the winding device 58, the piping 16 contracts. In this way, the expansion means 26 has a function of contracting the pipe 16 in addition to a function of expanding the pipe 16 from the contracted state.

In this seventh embodiment, the pipe 16 can be contracted by winding the wire 56 with the winding device 58. This allows the pipe 16 to be contracted even more.

The control unit 60 may control the winding device 58 in response to various conditions so that the diameter of the pipe 16 is adjusted when the heating element 12 is generating heat. This may change the diameter of the pipe 16 to vary the fluid resistance inside the pipe 16 and control the heat transport capacity of the heat transport device 10.

[Eighth embodiment]
Next, an eighth embodiment of the technology disclosed in this application will be described.

Figure 10 is a diagram showing a heat transport device 10 according to an eighth embodiment of the technology disclosed in the present application. In Figure 10, the heat transport device 10 is shown in a front cross-sectional view. Figure 10 (A) shows the state in which the pipe 16 is contracted, and Figure 10 (B) shows the state in which the pipe 16 is expanded.

In the eighth embodiment, the configuration of the heat transport device 10 is changed from the first embodiment (see FIGS. 1 and 2) as follows. That is, the expansion means 26 includes an actuator 62 and a control section 64.

The actuator 62 is, for example, a motor actuator, and has a movable part 66. The movable part 66 is connected to the peripheral wall part 24. The actuator 62 is configured to be able to expand the piping 16 from a contracted state and contract the piping 16 from an expanded state by moving the movable part 66.

The control unit 64 is configured by a computer having a processor, memory, etc., and is electrically connected to the actuator 62. This control section 64 has a function of controlling the actuator 62.

In this way, the expansion means 26 has the actuator 62 and the control unit 64, and in addition to the function of expanding the piping 16 from a contracted state, it also has the function of contracting the piping 16 from an expanded state by deforming the peripheral wall portion 24.

In this sixth embodiment, the actuator 62 can be driven to expand the piping 16 from a contracted state at any time, and contract the piping 16 from an expanded state.

Note that the control unit 64 may control the actuator 62 according to various conditions so that the diameter of the pipe 16 is adjusted when the heating element 12 is generating heat. Thereby, the diameter of the pipe 16 may be changed to vary the fluid resistance inside the pipe 16, thereby controlling the heat transport capacity of the heat transport device 10.

Furthermore, among the configurations of the expansion means 26 in the first to eighth embodiments described above, configurations that can be combined may be implemented in appropriate combinations.

[Ninth embodiment]
Next, a ninth embodiment of the technology disclosed in this application will be described.

Figure 11 is a diagram showing a pipe 16 according to a ninth embodiment of the technology disclosed in the present application. In Figure 11, the pipe 16 is shown in a cross-sectional view. Figure 11 (A) shows the pipe 16 in a contracted state, and Figure 11 (B) shows the pipe 16 in an expanded state.

In the ninth embodiment, the configuration of the pipe 16 is modified as follows from the first embodiment (see Figures 1 and 2). That is, a plurality of wicks 68 are provided on the inner surface of the peripheral wall portion 24 of the pipe 16 as an example of "multiple capillary force generating portions." The multiple wicks 68 extend in the axial direction of the peripheral wall portion 24. The multiple wicks 68 are preferably provided from the heat receiving portion 20 to the heat dissipating portion 22 (see Figure 1).

For example, a hydrophilic porous polymer is used for the plurality of wicks 68. The plurality of wicks 68 are arranged at intervals in the circumferential direction of the peripheral wall portion 24 . The plurality of wicks 68 may have the same shape or different shapes.

In this ninth embodiment, a plurality of wicks 68 extending in the axial direction of the peripheral wall portion 24 are provided on the inner peripheral surface of the peripheral wall portion 24, and the capillary force generated by the plurality of wicks 68 can transport the droplets 30 (see FIG. 1) condensed in the heat dissipation portion 22 to the heat receiving portion 20. This can improve the heat transport efficiency.

In addition, since the multiple wicks 68 are arranged at intervals from each other in the circumferential direction of the peripheral wall portion 24, the peripheral wall portion 24 can be bent in the gaps between the multiple wicks 68. This makes it possible to prevent the contraction of the peripheral wall portion 24 from being hindered.

The multiple wicks 68 may be made of a soft material so as not to impede the deformation of the peripheral wall portion 24.

Furthermore, a plurality of wicks 68 are provided on the inner circumferential surface of the circumferential wall section 24 at intervals in the circumferential direction of the circumferential wall section 24; good. In this case, it is desirable that the annular wick 68 be formed of a soft material so as not to inhibit the deformation of the peripheral wall portion 24.

[Tenth embodiment]
Next, a tenth embodiment of the technology disclosed in the present application will be described.

Figure 12 is a diagram showing a pipe 16 according to a tenth embodiment of the technology disclosed in the present application. In Figure 12, the pipe 16 is shown in a cross-sectional view. Figure 12 (A) shows the pipe 16 in a contracted state, and Figure 12 (B) shows the pipe 16 in an expanded state.

In the tenth embodiment, the configuration of the piping 16 is changed from the ninth embodiment (see FIG. 11) as follows. That is, a plurality of narrow grooves 70 are provided on the inner circumferential surface of the peripheral wall portion 24 of the pipe 16 as an example of "a plurality of capillary force generating parts." The plurality of narrow grooves 70 extend in the axial direction of the peripheral wall portion 24 . The plurality of narrow grooves 70 are preferably provided ranging from the heat receiving part 20 to the heat radiating part 22 (see FIG. 1).

The plurality of narrow grooves 70 are arranged at intervals in the circumferential direction of the peripheral wall portion 24 . The plurality of narrow grooves 70 may have the same shape or different shapes. Moreover, the plurality of narrow grooves 70 may be lined up at equal intervals or may be lined up at uneven intervals.

In this tenth embodiment, a plurality of narrow grooves 70 extending in the axial direction of the peripheral wall portion 24 are provided on the inner peripheral surface of the peripheral wall portion 24, and the capillary force generated by the plurality of narrow grooves 70 can transport the droplets 30 (see FIG. 1) condensed in the heat dissipation portion 22 to the heat receiving portion 20. This can improve the heat transport efficiency.

In addition, since the multiple narrow grooves 70 are arranged at intervals in the circumferential direction of the peripheral wall portion 24, the peripheral wall portion 24 can be bent in the gaps between the multiple narrow grooves 70. This makes it possible to prevent the contraction of the peripheral wall portion 24 from being hindered.

In addition, by combining the above-mentioned ninth embodiment (see FIG. 11) and the tenth embodiment, a plurality of wicks 68 and a plurality of fine grooves 70 may be provided on the inner surface of the peripheral wall portion 24 of the pipe 16.

Furthermore, among the above first to tenth embodiments, embodiments that can be combined may be combined as appropriate.

Furthermore, in the first to tenth embodiments described above, the piping 16 may be expanded or contracted only once, or the piping 16 may be expanded or contracted repeatedly.

In the first to tenth embodiments, the peripheral wall portion 24 is soft, flexible, or stretchable, and thus deforms in the radial direction. However, if the cooling body 14 is movable in the axial direction of the peripheral wall portion 24, the peripheral wall portion 24 may deform in the axial direction, or the peripheral wall portion 24 may deform in both the radial and axial directions.

The above describes the first to tenth embodiments of the technology disclosed in this application, but the technology disclosed in this application is not limited to the above, and can of course be implemented in various modifications within the scope of the gist of the technology.

The following additional notes are further disclosed regarding the first to tenth embodiments of the technology disclosed in the present application described above.

(Additional note 1)
Piping having a heat receiving part connected to a heating element, a heat radiating part connected to a cooling body, and a peripheral wall part connecting the heat receiving part and the heat radiating part;
a working fluid that is sealed inside the piping and transports heat from the heat receiving section to the heat radiating section with a phase change;
The peripheral wall portion has softness, flexibility, or elasticity,
The pipe expands from a contracted state with deformation of the peripheral wall portion.
Heat transport device.
(Additional note 2)
The peripheral wall portion has softness, pliability, or elasticity and is therefore deformable in the radial direction in a deformation mode different from thermal expansion.
The heat transport device according to Supplementary Note 1.
(Additional note 3)
The peripheral wall portion has softness, flexibility, or elasticity so that it can be deformed in the radial direction.
The heat transport device according to Supplementary Note 1 or Supplementary Note 2.
(Additional note 4)
The pipe contracts from the expanded state with deformation of the peripheral wall portion.
The heat transport device according to any one of Supplementary notes 1 to 3.
(Appendix 5)
The shape of the peripheral wall portion when the pipe is expanded is cylindrical;
The heat transport device according to any one of Supplementary notes 1 to 4.
(Appendix 6)
All of the peripheral wall portion has softness, flexibility or elasticity,
The heat transport device according to any one of Supplementary notes 1 to 5.
(Appendix 7)
Only a part of the peripheral wall portion has softness, flexibility, or stretchability;
The heat transport device according to any one of Supplementary notes 1 to 5.
(Appendix 8)
The volume of the pipe expands to more than twice that when it contracts,
The heat transport device according to any one of Supplementary notes 1 to 7.
(Appendix 9)
The heat receiving part is located vertically below the heat radiating part,
The heat transport device according to any one of Supplementary notes 1 to 8.
(Appendix 10)
The heat receiving part is formed in a container shape.
The heat transport device according to any one of Supplementary Notes 1 to 9.
(Appendix 11)
The peripheral wall portion has softness because at least a portion thereof is formed of a soft material.
The heat transport device according to any one of Supplementary notes 1 to 10.
(Appendix 12)
The peripheral wall part has flexibility by having a plurality of panels and a plurality of hinge parts connecting the plurality of panels.
The heat transport device according to any one of Supplementary notes 1 to 10.
(Appendix 13)
The peripheral wall portion has stretchability because at least a portion thereof is formed of a stretchable material.
The heat transport device according to any one of Supplementary notes 1 to 10.
(Appendix 14)
comprising an expansion means for expanding the piping from a contracted state with deformation of the peripheral wall;
The heat transport device according to any one of Supplementary notes 1 to 13.
(Appendix 15)
The expansion means has a function of contracting the pipe from an expanded state by deforming the peripheral wall portion.
The heat transport device according to appendix 14.
(Appendix 16)
The expansion means includes a structure in which the hydraulic fluid is sealed in the sealed piping.
The heat transport device according to appendix 14 or appendix 15.
(Appendix 17)
The expansion means is
a tank for storing the hydraulic fluid;
a conveying device that takes the working fluid in and out between the tank and the piping;
including,
The heat transport device according to any one of Supplementary notes 14 to 16.
(Appendix 18)
The expansion means includes a control unit that controls the conveyance device.
The heat transport device according to appendix 17.
(Appendix 19)
The expansion means includes a first biasing member that biases the peripheral wall in a direction in which the pipe expands.
The heat transport device according to any one of Supplementary notes 14 to 18.
(Additional note 20)
the first biasing member is a shape memory alloy;
The heat transport device according to appendix 19.
(Additional note 21)
the first biasing member is an elastic member;
The heat transport device according to appendix 19.
(Additional note 22)
The expansion means includes a second biasing member that biases the peripheral wall in a direction in which the piping contracts.
The heat transport device according to any one of Supplementary notes 14 to 21.
(Additional note 23)
the second biasing member is a shape memory alloy;
The heat transport device according to appendix 22.
(Additional note 24)
the second biasing member is an elastic member;
The heat transport device according to appendix 22.
(Additional note 25)
The expansion means is
a wire stretched around the peripheral wall;
A winding device that winds up the wire;
The heat transport device according to any one of Supplementary notes 14 to 24.
(Additional note 26)
The expansion means includes a control unit that controls the winding device.
The heat transport device according to appendix 25.
(Additional note 27)
The expansion means is
The heat transport device according to any one of attachments 14 to 26, including an actuator that expands the pipe.
(Additional note 28)
The expansion means includes a control unit that controls the actuator.
The heat transport device according to appendix 27.
(Additional note 29)
A capillary force generating portion extending in the axial direction of the peripheral wall portion is provided on the inner peripheral surface of the peripheral wall portion.
The heat transport device according to any one of attachments 14 to 28.
(Additional note 30)
comprising a plurality of the capillary force generating parts,
The plurality of capillary force generating parts are arranged at intervals in the circumferential direction of the peripheral wall part,
The heat transport device according to appendix 29.
(Appendix 31)
The capillary force generating section includes a wick.
The heat transport device according to attachment 29 or attachment 30.
(Appendix 32)
The capillary force generating section includes a narrow groove.
The heat transport device according to any one of attachments 29 to 31.
(Appendix 33)
A heat transport method comprising transporting heat from the heating element to the cooling element using the heat transporting device according to any one of Supplementary Notes 1 to 32.

10...heat transport device, 12...heat generating element, 14...cooling element, 16...piping, 18...working fluid, 20...heat receiving portion, 22...heat dissipating portion, 24...peripheral wall portion, 26...expansion means, 28...steam, 30...droplets, 32...panel, 34...hinge portion, 36...tank, 38...pipe, 40...transport device, 42...control portion, 44...pump, 46...valve, 48...biasing member, 54...pulley, 56...wire, 58...winding device, 60...control portion, 62...actuator, 64...control portion, 66...moving portion, 68...wick, 70...narrow groove

Claims (18)

A pipe having a heat receiving portion connected to a heat generating body, a heat dissipating portion connected to a cooling body, and a peripheral wall portion connecting the heat receiving portion and the heat dissipating portion;
a working fluid that is sealed inside the piping and that transports heat from the heat receiving portion to the heat radiating portion by undergoing a phase change;
The peripheral wall portion has a plurality of panels and a plurality of hinge portions connecting the plurality of panels, and thus has flexibility .
The pipe expands from a contracted state with the deformation of the peripheral wall portion.
Heat transport device. A pipe having a heat receiving portion connected to a heat generating body, a heat dissipating portion connected to a cooling body, and a peripheral wall portion connecting the heat receiving portion and the heat dissipating portion;
a working fluid that is sealed inside the piping and that transports heat from the heat receiving portion to the heat radiating portion by undergoing a phase change;
The peripheral wall portion has softness, flexibility or elasticity,
The pipe expands from a contracted state with the deformation of the peripheral wall portion,
the heat transport device includes an expansion unit that expands the pipe from a contracted state by deforming the peripheral wall portion,
The expansion means is
A tank for storing the hydraulic fluid;
A conveying device that transfers the hydraulic fluid between the tank and the piping;
including,
Heat transport device. A pipe having a heat receiving portion connected to a heat generating body, a heat dissipating portion connected to a cooling body, and a peripheral wall portion connecting the heat receiving portion and the heat dissipating portion;
a working fluid that is sealed inside the piping and that transports heat from the heat receiving portion to the heat radiating portion by undergoing a phase change;
The peripheral wall portion has softness, flexibility or elasticity,
The pipe expands from a contracted state with the deformation of the peripheral wall portion,
the heat transport device includes an expansion unit that expands the pipe from a contracted state by deforming the peripheral wall portion,
The expansion means includes a first biasing member that biases the peripheral wall portion in a direction in which the pipe expands.
Heat transport device. Piping having a heat receiving part connected to a heating element, a heat radiating part connected to a cooling body, and a peripheral wall part connecting the heat receiving part and the heat radiating part;
a working fluid that is sealed inside the piping and transports heat from the heat receiving section to the heat radiating section with a phase change;
The peripheral wall portion has softness, flexibility, or elasticity,
The pipe expands from the contracted state with deformation of the peripheral wall,
The heat transport device includes an expansion means that expands the piping from a contracted state with deformation of the peripheral wall portion,
The expansion means includes a second biasing member that biases the peripheral wall in a direction in which the piping contracts.
Heat transport device. The peripheral wall portion has softness, flexibility, or elasticity so that it can be deformed in the radial direction.
The heat transport device according to any one of claims 2 to 4. The pipe contracts from the expanded state with deformation of the peripheral wall portion.
The heat transport device according to any one of claims 1 to 5 . The heat receiving part is located vertically below the heat radiating part,
The heat transport device according to any one of claims 1 to 6 . The peripheral wall portion has softness because at least a portion thereof is formed of a soft material.
The heat transport device according to any one of claims 2 to 4 . The peripheral wall portion has a plurality of panels and a plurality of hinge portions connecting the plurality of panels, and thus has flexibility.
The heat transport device according to any one of claims 2 to 4 . The peripheral wall portion is at least partially made of an elastic material, and thus has elasticity.
The heat transport device according to any one of claims 2 to 4 . comprising an expansion means for expanding the piping from a contracted state with deformation of the peripheral wall;
The heat transport device according to claim 1 . The expansion means has a function of contracting the pipe from an expanded state by deforming the peripheral wall portion.
The heat transport device according to claim 11 . The expansion means includes a structure in which the hydraulic fluid is sealed in the sealed piping.
The heat transport device according to claim 11 or 12 . The expansion means is
A tank for storing the hydraulic fluid;
A conveying device that transfers the hydraulic fluid between the tank and the piping;
including,
The heat transport device according to any one of claims 11 to 13 . The expansion means includes a first biasing member that biases the peripheral wall portion in a direction in which the pipe expands.
The heat transport device according to any one of claims 11 to 14 . The expansion means includes a second biasing member that biases the peripheral wall portion in a direction in which the pipe contracts.
The heat transport device according to any one of claims 11 to 15 . A capillary force generating portion extending in the axial direction of the peripheral wall portion is provided on the inner peripheral surface of the peripheral wall portion.
The heat transport device according to any one of claims 1 to 16 . comprising a plurality of the capillary force generating parts,
The plurality of capillary force generating parts are arranged at intervals in the circumferential direction of the peripheral wall part,
The heat transport device according to claim 17 .