JP7476913B2 - Pumps, heat pipes - Google Patents

Description

The present invention relates to a pump and a heat pipe.

The heat pipe described in Patent Document 1 has a heating end that receives heat from the outside and a cooling end that dissipates heat by being cooled from the outside. It also has a container whose hollow interior can be sealed, a working liquid that is sealed inside the container and undergoes vaporization and condensation, and a wick that is provided along the inner wall surface of the container and moves the working liquid from the cooling end to the heating end.

JP 2004-28406 A

In conventional heat pipes, the wick, which is a hydrophilic porous material, uses capillary action to move the liquid from the condenser (cooling end) to the evaporator (heating end) as the destination. In this type of configuration, the liquid moves while coming into contact with the pore walls of the many holes formed in the hydrophilic porous material, which increases the fluid resistance of the flow path and reduces the amount of liquid moving to the destination.

The objective of this disclosure is to move a larger amount of liquid to a target location per unit time compared to moving liquid to a target location using a lyophilic porous body.

The pump according to a first aspect of the present invention is characterized in that it comprises a liquidphobic porous body that separates at least a part of a gas phase region and a liquid phase region, and a condenser that faces the liquid phase region and condenses steam that has passed through the porous body from the gas phase region.
According to the above configuration, the condenser condenses the vapor flowing from the gas phase region through the porous body toward the liquid phase region. The condensed liquid pushes the liquid in the portion of the porous body on the liquid phase region side into the liquid phase region. The liquid in the liquid phase region moves within the liquid phase region due to this pushing force. In other words, the pump moves the liquid within the liquid phase region by this pushing force. Therefore, the fluid resistance of the flow path is smaller than when moving liquid within a lyophilic porous body, and a large amount of liquid can be moved to the target position per unit time.

The pump according to the second aspect of the present disclosure is the pump according to the first aspect, characterized in that the porous body extends horizontally and the condenser is disposed on one side of the porous body.

According to the above configuration, the pump moves liquid from one side of the porous body to the other side along the porous body extending in the horizontal direction. Therefore, a larger amount of liquid can be moved to the target position per unit time compared to a case in which the porous body is inclined so that the other side is higher than the one side.

The heat pipe according to the third aspect of the present disclosure is characterized by comprising a lyophobic porous body that separates at least a portion of a gas phase region and a liquid phase region, a condenser that faces the liquid phase region and condenses the vapor that has passed from the gas phase region through the porous body, and an evaporator that is spaced apart from the condenser in a direction along the porous body, faces the liquid phase region, and evaporates the liquid from the condenser.

According to the above configuration, the condenser condenses the vapor passing from the gas phase region through the porous body toward the liquid phase region. The condensed liquid pushes the liquid in the portion of the porous body on the liquid phase region side into the liquid phase region. This pushing force causes the liquid to move toward the evaporator within the liquid phase region.

The evaporator then evaporates the liquid from the condenser. The vapor moves through the porous medium to the gas phase region due to the pressure difference. The vapor that has moved to the gas phase region moves to the condenser side within the gas phase region due to the pressure difference. The vapor that has moved to the condenser side passes through the porous medium to the liquid phase region, and the above process is repeated.

This allows a larger amount of liquid to move to the evaporator side per unit time compared to moving liquid inside a lyophilic porous body, and therefore allows for a greater amount of heat to be transferred.

The heat pipe according to the fourth aspect of the present disclosure is the heat pipe according to the third aspect, characterized in that the porous body extends horizontally.

According to the above configuration, the heat pipe moves liquid from the condenser side to the evaporator side along the porous body extending horizontally. Therefore, compared to when the porous body is inclined so that the evaporator side of the porous body is higher than the condenser side, the amount of liquid that moves to the evaporator side per unit time is greater, and the amount of heat transferred can be increased.

The heat pipe according to the fifth aspect of the present disclosure is the heat pipe according to the third or fourth aspect, characterized in that the evaporator is provided with a heat dissipation section that faces the liquid phase region and dissipates heat to the liquid, and the entire heat dissipation section faces the porous body across the liquid phase region.

According to the above configuration, the entire heat dissipation section faces the porous body with the liquid phase region in between. Therefore, compared to when only a part of the heat dissipation section faces the porous body with the liquid phase region in between, the amount of steam that moves through the porous body to the gas phase region is greater, and the amount of heat transferred can be increased.

The heat pipe according to the sixth aspect of the present disclosure is the heat pipe according to any one of the third to fifth aspects, characterized in that the condenser is provided with a heat receiving part that faces the liquid phase region and receives heat from the steam, and the entire heat receiving part faces the porous body across the liquid phase region.

According to the above configuration, the entire heat receiving portion faces the porous body with the liquid phase region in between. Therefore, compared to when only a part of the heat receiving portion faces the porous body with the liquid phase region in between, the amount of liquid that condenses through the porous body is greater, and the amount of liquid that moves to the evaporator side can be increased.

1A to 1C are cross-sectional views showing a heat pipe according to a first embodiment of the present disclosure. FIG. 2 is an explanatory diagram for explaining the liquid phobicity of a porous body used in the heat pipe according to the first embodiment of the present disclosure. 3A and 3B are schematic diagrams showing the direction of movement of a working liquid in a heat pipe according to a first embodiment of the present disclosure. 1 is a configuration diagram showing an example of a heat pipe according to a first embodiment of the present disclosure; 1 is a graph showing evaluation results of examples and comparative examples of the heat pipe according to the first embodiment of the present disclosure. FIG. 2 is a configuration diagram showing a comparative example for the example of the heat pipe according to the first embodiment of the present disclosure. 5A to 5C are cross-sectional views showing a heat pipe according to a second embodiment of the present disclosure. 11A to 11C are cross-sectional views showing a heat pipe according to a third embodiment of the present disclosure. 11A to 11C are cross-sectional views showing a heat pipe according to a fourth embodiment of the present disclosure.

First Embodiment
An example of a pump and a heat pipe according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 6. Note that all of the drawings used in the following description are schematic, and the dimensional relationships between elements and the ratios between elements shown in the drawings do not necessarily correspond to the actual ones. Also, the arrow H shown in the drawings indicates the up-down direction (vertical direction) of the heat pipe, the arrow W indicates the pipe width direction (horizontal direction) of the heat pipe, and the arrow L indicates the pipe longitudinal direction (horizontal direction) of the heat pipe.

(overall structure)
1, the heat pipe 10 includes a rectangular parallelepiped housing 12 that is hollow inside and extends in the longitudinal direction of the pipe, a working liquid that repeatedly evaporates and condenses inside the housing 12, and a sheet-like porous body 40 that vertically separates a gas phase region 50 and a liquid phase region 52. Specifically, the upper part of the porous body 40 is the liquid phase region 52, and the lower part of the porous body 40 is the gas phase region 50. Furthermore, the heat pipe 10 includes a cooling section 20 that cools the working liquid, and a heating section 30 that heats the working liquid.

[Housing 12, cooling unit 20, heat generating unit 30]
The housing 12 is made of a resin material, and the inside of the housing 12 is in a vacuum state.

As shown in FIG. 1, the cooling unit 20 is a rectangular parallelepiped extending in the longitudinal direction of the pipe, and is disposed on one side of the housing 12 in the longitudinal direction of the pipe. Specifically, a through hole 14a that penetrates between the inside and outside of the housing 12 is formed on one side of the longitudinal direction of the pipe in the top plate 14 of the housing 12, and a part of the cooling unit 20 is fitted into this through hole 14a. The cooling unit 20 is an example of a condenser.

The surface of the cooling section 20 facing the liquid phase region 52 is the heat receiving surface 22 that receives heat from the working liquid. Furthermore, the entire heat receiving surface 22 faces the porous body 40 with the liquid phase region 52 in between. The heat receiving surface 22 is an example of a heat receiving section.

The cooling unit 20 is cooled, for example, by a water-cooled block or a heat sink, and is configured to cool the working liquid that comes into contact with the heat-receiving surface 22 of the cooling unit 20.

As shown in FIG. 1, the heat generating unit 30 is a rectangular parallelepiped extending in the pipe longitudinal direction, and is disposed in the other side of the pipe longitudinal direction in the housing 12. Specifically, a through hole 14b penetrating the inside and outside of the housing 12 is formed in the other side of the pipe longitudinal direction in the top plate 14 of the housing 12, and a part of the heat generating unit 30 is fitted into this through hole 14b. The heat generating unit is an example of an evaporator.

The surface of the heat generating portion 30 facing the liquid phase region 52 is a heat dissipation surface 32 that dissipates heat to the working liquid. Furthermore, the entire heat dissipation surface 32 faces the porous body 40 with the liquid phase region 52 in between. The heat dissipation surface 32 is an example of a heat dissipation portion.

The heat generating unit 30 generates heat by being heated by semiconductor elements such as an Insulated Gate Bipolar Transistor (IGBT) or a Metal-Oxide Semiconductor (MOS), and heats the working liquid that comes into contact with the heat dissipation surface 32 of the heat generating unit 30.

[Porous body 40]
The porous body 40 is made of a liquid-phobic material and is in the form of a sheet that is permeable to vapor but not to liquid. As shown in FIG. 1, the porous body 40 is disposed so as to divide the inside of the housing 12 into upper and lower compartments.

Specifically, the thickness direction of the porous body 40 is the vertical direction, and the porous body 40 extends in the horizontal direction. Furthermore, the porous body 40 separates a liquid phase region 52, which faces the heat dissipation surface 32 of the heat generating part 30 and the heat receiving surface 22 of the cooling part 20, from a gas phase region 50. The gas phase region 50 is wider than the liquid phase region 52. In addition, the cooling part 20 is disposed on one side of the porous body 40 in the longitudinal direction of the pipe, and the heat generating part 30 is disposed on the other side of the porous body 40 in the longitudinal direction of the pipe.

Here, in this embodiment, a "lyophobic material" is a material with a contact angle α of 90 degrees or more with the working liquid. The contact angle is used to evaluate how a liquid and a solid "wet or not wet," that is, wettability. Specifically, as shown in FIG. 2, a droplet T is attached to a surface M formed of a material constituting the porous body 40, and observed from the side. The angle of the rise of the droplet T, that is, the angle between the solid-liquid interface (horizontal line) and the tangent line at the end of the droplet, is the contact angle α. The larger the contact angle α, the higher the lyophobicity. In this embodiment, the porous body 40 formed of a lyophobic material is referred to as a hydrophobic porous body 40.

In addition, in this embodiment, a "porous body" is a member with a porosity of 20% or more and 95% or less, and preferably a member with a porosity of 50% or more and 80% or less.

In this embodiment, a sheet of polytetrafluoroethylene (PTFE) with a thickness of 0.5 mm and a porosity of 75% is used as the porous body 40, and water is used as the working liquid.

(Action)
Next, the operation of the heat pipe 10 will be described.
The hydrophobic porous body 40 is a member that allows vapor to pass through but does not allow liquid to pass through, so that the working liquid in the liquid phase region 52 protrudes in a curved shape into the voids 40a of the porous body 40 as shown in FIG.

In the liquid phase region 52 on the cooling section 20 side shown in FIG. 1, the cooling section 20 cools the working liquid in contact with the heat receiving surface 22, and condenses the vapor of the working liquid (hereinafter sometimes referred to as "working liquid vapor") traveling from the gas phase region 50 through the porous body 40 toward the liquid phase region 52. In this way, the cooling section 20 is heated by the latent heat of condensation generated when the working liquid vapor condenses.

The condensed working liquid also pushes the working liquid that protrudes in a curved shape into the voids 40a of the porous body 40 into the liquid phase region 52 in the direction of the arrow A shown in Figures 1 and 3 (B). This pushing force causes the working liquid to move in the liquid phase region 52 toward the heat generating portion 30 in the direction of the arrow B shown in Figures 1 and 3 (B).

In this way, in the heat pipe 10, the working liquid moves from one side of the porous body 40 to the other side along the porous body 40, which extends horizontally.

Furthermore, the heat generating section 30 heats and evaporates the working liquid that has moved from the cooling section 20 side. In this way, the heat generating section 30 is cooled by the latent heat of vaporization generated when the working liquid evaporates.

The evaporated working fluid vapor moves through the porous body 40 to the gas phase region 50 in the direction of arrow C shown in FIG. 1 due to the pressure difference resulting from the temperature difference. The working fluid vapor that has moved to the gas phase region 50 moves within the gas phase region 50 to the cooling section 20 side in the direction of arrow D shown in FIG. 1 due to the pressure difference resulting from the temperature difference. The working fluid vapor that has moved to the cooling section 20 side passes through the porous body 40 toward the liquid phase region 52, and the above-mentioned process is repeated.

By repeating this process, the heat generating section 30 is continuously cooled by the latent heat of vaporization generated when the working liquid evaporates.

In this way, the pump 18 that moves the working liquid within the liquid phase region 52 is composed of the porous body 40 that separates the gas phase region 50 and the liquid phase region 52, and the cooling section 20 that faces the liquid phase region 52 and condenses the working liquid vapor that has passed from the gas phase region 50 through the porous body 40.

(evaluation)
Next, an evaluation of the heat pipe 10 of the example according to this embodiment and the heat pipe 510 of the comparative example will be described.

[Evaluation specifications]
-Example-
4, a copper plate 20a and a cooling passage 20b through which cooling water flows are used as the cooling portion 20 of the heat pipe 10 of the embodiment. Specifically, the copper plate 20a and the cooling passage 20b are stacked in this order from bottom to top, and the copper plate 20a faces the liquid phase region 52.

In addition, in order to measure the latent heat of condensation when the working fluid vapor is condensed by the cooling unit 20, a pair of thermocouples 20c are arranged in the cooling unit 20 so as to sandwich the portion of the cooling path 20b that overlaps with the copper plate 20a. Furthermore, in order to measure the flow rate of the cooling water flowing inside the cooling path 20b, a flow meter 20d is arranged in the cooling unit 20.

The heat generating section 30 is made up of a copper plate 30a, a rubber heater 30b, and a heat insulating material 30c. Specifically, the copper plate 30a, the rubber heater 30b, and the heat insulating material 30c are stacked in this order from bottom to top, with the copper plate 30a facing the liquid phase region 52.

Furthermore, a sheet of polytetrafluoroethylene (PTFE) with a thickness of 0.5 mm and a porosity of 75% is used as the porous body 40, and water is used as the working liquid.

--Comparative Example--
The working fluid vapor is vacuum sealed inside the housing 12 of the heat pipe 510 of the comparative example, and a gas phase region 550 is formed as shown in Fig. 6. A wick 540 having a capillary structure is attached to the inner wall of the housing 12. Furthermore, the heat pipe 510 includes a cooling section 20 and a heat generating section 30, similar to the embodiment.

Specifically, the wick 540 is a sheet-like, hydrophilic porous body that is attached to the top plate 14 of the housing 12 from inside the housing 12 and is wetted by the working liquid. One side of the wick 540 in the longitudinal direction of the pipe is in contact with the copper plate 20a of the cooling section 20, and the other side of the wick 540 in the longitudinal direction of the pipe is in contact with the copper plate 30a of the heating section 30. A hydrophilic sintered polyethylene porous body with a thickness of 0.6 mm and a porosity of 44% is used as the wick 540.

Specifications other than those described above are the same for the examples and comparative examples.

In this configuration, in the comparative heat pipe 510, the heat generating part 30 heats the working liquid in the wick 540 and evaporates it. The evaporated working liquid vapor is released from the wick 540 into the gas phase region 550. The working liquid vapor released into the gas phase region 550 moves from the heat generating part 30 side to the cooling part 20 side within the gas phase region 550 due to the pressure difference resulting from the temperature difference (see arrow F in FIG. 6).

The cooling unit 20 then condenses the working fluid vapor that has moved toward the cooling unit 20. The condensed working fluid wets the wick 540, and moves from the cooling unit 20 to the heat generating unit 30 within the wick 540 due to capillary action. The above-mentioned process is then repeated in the heat pipe 510.

〔Evaluation item〕
The relationship was evaluated between the amount of cooling heat (amount of heat removed) by which the working liquid is cooled by the cooling section 20 by flowing the cooling liquid through the cooling path 20b, and the amount of heat (amount of heat dissipated) by which the working liquid is heated by the heat generating section 30 due to the output of the rubber heater 30b supplied with electricity.

Specifically, the amount of cooling heat was measured using a pair of thermocouples 20c and a flow meter 20d, and the amount of heating was measured using the power supplied to the rubber heater 30b. The limit output of the rubber heater 30b is 30 [W]. In other words, the maximum power supplied to the rubber heater 30b is 30 [W].

〔Evaluation results〕
A graph showing the evaluation results is shown in Fig. 5. The vertical axis of the graph in Fig. 5 represents the amount of heat [W], and the horizontal axis of the graph represents the elapsed time [S].

The solid line L1 represents the amount of heat applied to the working liquid by the heat generating section 30 of the heat pipe 10 in the embodiment, and the two-dot chain line L2 represents the amount of heat applied to the working liquid by the cooling section 20 of the heat pipe 10.

In contrast, the solid line L11 represents the amount of heat applied to the working liquid by the heat generating portion 30 of the heat pipe 510 in the comparative example, and the two-dot chain line L12 represents the amount of heat applied to the working liquid by the cooling portion 20 of the heat pipe 510.

As shown by the solid line L1, in the heat pipe 10 of the embodiment, the amount of heat is stable at the limit output of the rubber heater 30b.

In contrast, as shown by the solid line L11, in the heat pipe 510 according to the comparative example, the output of the rubber heater 30b does not reach the limit output, and drops immediately after the peak. This is thought to be because the movement of the working liquid to the heat generating part 30 side is insufficient, causing it to dry out. Specifically, it is thought that the movement of the working liquid to the heat generating part 30 side is insufficient, and therefore the working liquid heated by the heat generating part 30 is insufficient.

These results show that the heat pipe 10 of the embodiment moves a larger amount of working liquid from the cooling section 20 side to the heat generating section 30 side per unit time compared to the heat pipe 510 of the comparative example. In other words, the pump 18 of the heat pipe 10 moves a larger amount of working liquid from the cooling section 20 side to the heat generating section 30 side per unit time compared to the heat pipe 510 of the comparative example.

In addition, the heat pipe 10 according to the embodiment has a larger amount of heat (amount of heat dissipation) than the heat pipe 510 according to the comparative example. In other words, the heat pipe 10 according to the embodiment removes heat from the heat generating portion 30 more effectively than the heat pipe 510 according to the comparative example.

[Considerations]
The heat pipe 510 according to the comparative example, which uses a wick 540 that is a hydrophilic porous material to move (transport) the working liquid, moves the working liquid from the cooling unit 20 side to the heat generating unit 30 side within the wick 540. For this reason, the fluid resistance of the flow path is large, and the moving speed decreases rapidly when the moving distance from the cooling unit 20 side to the heat generating unit 30 side becomes long. In other words, the amount of working liquid that moves from the cooling unit 20 side to the heat generating unit 30 side per unit time decreases.

In contrast, the heat pipe 10 according to the embodiment moves the working liquid from the cooling section 20 side to the heat generating section 30 side within the liquid phase region 52. Therefore, the fluid resistance of the flow path is small, and even if the moving distance from the cooling section 20 side to the heat generating section 30 side is long, the moving speed does not suddenly slow down. In other words, the amount of working liquid that moves from the cooling section 20 side to the heat generating section 30 side per unit time is greater than that of the heat pipe 510.

(summary)
As described above, in the pump 18 provided in the heat pipe 10, the cooling unit 20 condenses the working liquid vapor flowing from the gas phase region 50 through the porous body 40 toward the liquid phase region 52. The condensed working liquid pushes the working liquid in the portion of the porous body 40 on the liquid phase region side toward the liquid phase region 52. The working liquid moves within the liquid phase region 52 due to this pushing force. Therefore, compared to the heat pipe 510 according to the comparative example, a larger amount of working liquid can be moved per unit time from the cooling unit 20 side to the heat generating unit 30 side.

In addition, in the pump 18, the porous body 40 extends horizontally. Therefore, a larger amount of working liquid can be moved from the cooling section 20 side to the heating section 30 side per unit time compared to when the porous body is inclined so that the heating section 30 side of the porous body is higher than the cooling section 20 side.

In addition, the heat pipe 10 is equipped with a pump 18, which allows for a greater amount of heat transfer compared to the heat pipe 510 in the comparative example.

In addition, in the heat pipe 10, the porous body 40 extends horizontally. Therefore, compared to when the porous body 40 is inclined so that the heat generating section 30 side of the porous body is higher than the cooling section 20 side, a larger amount of working liquid can be moved to the heat generating section 30 side per unit time, thereby increasing the amount of heat transferred.

In addition, in the heat pipe 10, the entire heat dissipation surface 32 formed in the heat generating portion 30 faces the porous body 40 with the liquid phase region 52 in between. Therefore, compared to when only a portion of the heat dissipation surface faces the porous body with the liquid phase region in between, the amount of working fluid vapor passing through the porous body 40 is increased, and the amount of heat transferred can be increased.

In addition, in the heat pipe 10, the entire heat receiving surface 22 formed in the cooling section 20 faces the porous body 40 with the liquid phase region 52 in between. Therefore, compared to when only a portion of the heat receiving surface faces the porous body with the liquid phase region in between, the amount of working liquid vapor passing through the porous body 40 is greater, and heat can be received from the working liquid more effectively.

Second Embodiment
Next, an example of a pump and a heat pipe according to a second embodiment of the present disclosure will be described with reference to Fig. 7. Note that, regarding the second embodiment, differences from the first embodiment will be mainly described.

(overall structure)
7, the heat pipe 110 according to the second embodiment includes a cylindrical housing 112 that is hollow and extends in the longitudinal direction of the pipe, a cooling section 120, and a heat generating section 130. The heat pipe 110 further includes a working liquid that repeatedly vaporizes and condenses inside the housing 112, and a sheet-like porous body 140 that separates a gas phase region 150 and a liquid phase region 152.

The porous body 140 and the cooling section 120 constitute a pump 118 that moves the working liquid in the liquid phase region 152.

[Cooling section 120, heating section 130]
7, the cooling unit 120 is in the shape of a rectangular parallelepiped extending in the pipe longitudinal direction, and is disposed on one side of the pipe longitudinal direction in the housing 112. Specifically, a through hole 114a penetrating the inside and outside of the housing 112 is formed in one side of the pipe longitudinal direction in the arc-shaped wall plate 114 of the housing 112, and a part of the cooling unit 120 is fitted into this through hole 114b. The cooling unit 120 is an example of a condenser.

The surface of the cooling section 120 facing the liquid phase region 152 is a heat receiving surface 122 that receives heat from the working liquid. Furthermore, the entire heat receiving surface 122 faces the porous body 140 with the liquid phase region 152 in between. The heat receiving surface 122 is an example of a heat receiving section.

As shown in FIG. 7, the heat generating unit 130 is a rectangular parallelepiped extending in the pipe longitudinal direction, and is disposed in the other side of the pipe longitudinal direction in the housing 112. Specifically, a through hole 114b penetrating the inside and outside of the housing 112 is formed in the other side of the pipe longitudinal direction in the arc-shaped wall plate 114 of the housing 112, and a part of the cooling unit 120 is fitted into this through hole 114b. The heat generating unit is an example of an evaporator.

The surface of the heat generating portion 130 facing the liquid phase region 152 is a heat dissipation surface 132 that dissipates heat to the working liquid. Furthermore, the entire heat dissipation surface 132 faces the porous body 140 with the liquid phase region 152 in between. The heat dissipation surface 132 is an example of a heat dissipation portion.

[Porous body 140]
As shown in FIG. 7, the porous body 140 is in the form of a sheet, and is arranged so as to partition the inside of the housing 112 into a gas phase region 150 and a liquid phase region 152 .

Specifically, the porous body 140 has an arc-shaped arc portion 140a that extends in the pipe longitudinal direction along the inner circumferential surface of the housing 112, and abutment portions 140b that extend from both ends of the arc portion 140a toward the inner circumferential surface of the housing 112 and abut against the inner circumferential surface of the housing 112.

Third Embodiment
Next, an example of a pump and a heat pipe according to a third embodiment of the present disclosure will be described with reference to Fig. 8. Note that, regarding the third embodiment, differences from the second embodiment will be mainly described.

(overall structure)
8, the heat pipe 210 according to the third embodiment includes a cylindrical housing 112, a cooling section 120, and a heat generating section 130. The heat pipe 210 further includes a working liquid that repeatedly vaporizes and condenses inside the housing 112, and a sheet-like porous body 240 that separates a gas phase region 250 and a liquid phase region 252.

The porous body 240 and the cooling section 120 constitute a pump 218 that moves the working liquid within the liquid phase region 252.

[Porous body 240]
As shown in FIG. 8, the porous body 240 is cylindrical, and is disposed so as to divide the inside of the housing 112 into a gas phase region 250 and a liquid phase region 252 .

Specifically, the porous body 240 is cylindrical and extends in the longitudinal direction of the pipe along the inner circumferential surface of the housing 112. The inside of the porous body 240 is a gas phase region 250, and the outside of the porous body 240 is a liquid phase region 252.

Fourth Embodiment
Next, an example of a pump and a heat pipe according to a fourth embodiment of the present disclosure will be described with reference to Fig. 9. Note that, regarding the fourth embodiment, differences from the third embodiment will be mainly described.

(overall structure)
9, a heat pipe 310 according to the fourth embodiment includes a cylindrical housing 312, a cooling section 320, and a heat generating section 330. The inside of the housing 312 further includes a working liquid that repeatedly vaporizes and condenses, and a sheet-like porous body 240 that separates a gas phase region 250 and a liquid phase region 252.

The porous body 240 and the cooling section 320 constitute a pump 318 that moves the working liquid within the liquid phase region 252.

[Cooling section 320, heating section 330]
As shown in Fig. 9, the cooling unit 320 is cylindrical and extends in the pipe longitudinal direction, and is disposed in the housing 312 at one side in the pipe longitudinal direction. Specifically, the housing 312 includes a central portion 312a at the central side in the pipe longitudinal direction, a first portion 312b at one side in the pipe longitudinal direction, and a second portion 312c at the other side in the pipe longitudinal direction. The cylindrical cooling unit 320 is sandwiched between the central portion 312a and the first portion 312b. Furthermore, the inner peripheral surface of the cooling unit 320 and the inner peripheral surface of the housing 312 are disposed on the same plane. The cooling unit 320 is an example of a condenser.

The surface of the cooling section 320 facing the liquid phase region 252 is a heat receiving surface 322 that receives heat from the working liquid. Furthermore, the entire heat receiving surface 322 faces the porous body 240 with the liquid phase region 252 in between. The heat receiving surface 322 is an example of a heat receiving section.

As shown in FIG. 9, the heat generating part 330 is cylindrical and extends in the longitudinal direction of the pipe, and is disposed in the other part of the housing 312 in the longitudinal direction of the pipe. Specifically, the cylindrical heat generating part 330 is sandwiched between the central part 312a and the other part 312c. Furthermore, the inner peripheral surface of the heat generating part 330 and the inner peripheral surface of the housing 312 are disposed on the same plane. The heat generating part 330 is an example of an evaporator.

The surface of the heat generating portion 330 facing the liquid phase region 252 is a heat dissipation surface 332 that dissipates heat to the working liquid. Furthermore, the entire heat dissipation surface 332 faces the porous body 240 with the liquid phase region 252 in between. The heat dissipation surface 332 is an example of a heat dissipation portion.

In this way, the cooling section 320 surrounds one side of the liquid phase region 252 in the longitudinal direction of the pipe, the heating section 330 surrounds the other side of the liquid phase region 252 in the longitudinal direction of the pipe, and the liquid phase region 252 surrounds the gas phase region 250. Working liquid vapor is condensed around the entire circumference of the porous body 240 on one side of the longitudinal direction of the pipe, and working liquid evaporates around the entire circumference of the porous body 240 on the other side of the longitudinal direction of the pipe. This allows the heat pipe 310 to transfer a large amount of heat.

Although the present disclosure has been described in detail with respect to a specific embodiment, it will be apparent to those skilled in the art that the present disclosure is not limited to the embodiment, and various other embodiments are possible within the scope of the present disclosure. For example, in the above embodiment, water is used as the working liquid, but, for example, methanol, ethanol, ethylene glycol, etc. may also be used.

In addition, in the above embodiment, the entire heat receiving surface 22, 122, 322 faces the porous body 40, 140, 240 with the liquid phase region 52, 152, 252 in between, but a part of the heat receiving surface may face the porous body. In this case, the effect of the entire heat receiving surface facing the porous body is not achieved.

In addition, in the above embodiment, the entire heat dissipation surface 32, 132, 332 faces the porous body 40, 140, 240 with the liquid phase region 52, 152, 252 in between, but a part of the heat dissipation surface may face the porous body. In this case, the effect of the entire heat dissipation surface facing the porous body is not achieved.

Although not specifically described in the above embodiment, it is sufficient that the entire heat receiving surface 22, 122, 322 faces the porous body 40, 140, 240 with the liquid phase region 52, 152, 252 in between, and the entire heat dissipation surface 32, 132, 332 faces the porous body 40, 140, 240 with the liquid phase region 52, 152, 252 in between, and a partition member that separates the liquid phase region from the gas phase region is provided in the portion not facing the heat receiving surface and the heat dissipation surface. This allows the amount of porous body used to be reduced.

Although not specifically described in the second, third, and fourth embodiments, the housings 112, 312 may be, for example, elliptical. Furthermore, in the above embodiments, the housings 12, 112, 312 are formed using a resin material, but the housings may be formed using, for example, a metal material (stainless steel, aluminum alloy, titanium alloy, etc.).

In addition, although not specifically described in the above embodiment, since water is used as the working liquid, lyophobicity can be read as hydrophobicity, and lyophilicity can be read as hydrophilicity.

10 Heat pipe 18 Pump 20 Cooling section (an example of a condensation section)
22 Heat receiving surface (an example of a heat receiving part)
30 Heat generating part (an example of an evaporator)
32 Heat dissipation surface (an example of a heat dissipation part)
40 Porous body 50 Gas phase region 52 Liquid phase region 110 Heat pipe 118 Pump 120 Cooling section (an example of a condensation section)
122 Heat receiving surface (an example of a heat receiving part)
130 Heat generating part (an example of an evaporator)
132 heat dissipation surface (an example of a heat dissipation part)
140 Porous body 150 Gas phase region 152 Liquid phase region 210 Heat pipe 218 Pump 240 Porous body 250 Gas phase region 252 Liquid phase region 310 Heat pipe 318 Pump 320 Cooling section (an example of a condensation section)
322 Heat receiving surface (an example of a heat receiving part)
330 Heat generating part (an example of an evaporator)
332 Heat dissipation surface (an example of a heat dissipation part)
510 Heat Pipe

Claims (7)

A housing having a gas phase region and a liquid phase region therein;
a liquid-phobic porous body that separates at least a portion of the gas phase region and the liquid phase region;
a condenser facing the liquid phase region and condensing the steam passing through the porous body from the gas phase region;
The condenser is provided with a heat receiving portion that receives heat from steam,
The pump has a through hole formed in the housing, into which at least a portion of the condenser is inserted, so that the entire heat receiving portion directly faces the liquid phase region . The porous body extends in a horizontal direction,
The condenser is disposed on one side of the porous body.
2. The pump of claim 1. The housing has a cylindrical shape extending in one direction,
The porous body is disposed inside the housing and has a cylindrical shape extending in one direction,
The gas phase region is provided inside the porous body,
The liquid phase region is provided on the opposite side of the gas phase region with the porous body interposed therebetween,
The condenser is cylindrical and surrounds the liquid phase region.
3. A pump according to claim 1 or 2. A housing having a gas phase region and a liquid phase region therein;
a liquid-phobic porous body that separates at least a portion of the gas phase region and the liquid phase region;
a condenser facing the liquid phase region and condensing the vapor passing through the porous body from the gas phase region;
an evaporator that is spaced apart from the condenser in a direction along the porous body, faces the liquid phase region, and evaporates liquid from the condenser;
The condenser is provided with a heat receiving portion that receives heat from steam,
The evaporator is provided with a heat dissipation portion that dissipates heat to a liquid,
The heat pipe has a through hole in the housing through which at least a portion of the condenser is inserted, so that the entire heat receiving portion directly faces the liquid phase region, and another through hole in which at least a portion of the evaporator is inserted, so that the entire heat dissipation portion directly faces the liquid phase region. The porous body extends in a horizontal direction.
The heat pipe according to claim 4. The housing has a cylindrical shape extending in one direction,
The porous body is disposed inside the housing and has a cylindrical shape extending in one direction,
The gas phase region is provided inside the porous body,
The liquid phase region is provided on the opposite side of the gas phase region with the porous body interposed therebetween,
The condenser is cylindrical and surrounds the liquid phase region.
The evaporator is cylindrical and surrounds the liquid phase region.
The heat pipe according to claim 4 or 5. a liquid-phobic porous body that separates at least a portion of a gas phase region and a liquid phase region;
a condenser facing the liquid phase region and condensing the vapor passing through the porous body from the gas phase region;
an evaporator that is spaced apart from the condenser in a direction along the porous body, faces the liquid phase region, and evaporates liquid from the condenser;
The evaporator is provided with a heat dissipation portion facing the liquid phase region and dissipating heat to the liquid,
the entire heat dissipation portion faces the porous body with the liquid phase region therebetween,
the condenser is provided with a heat receiving portion facing the liquid phase region and receiving heat from the steam,
The entire heat receiving portion faces the porous body with the liquid phase region therebetween,
A pump in which the porous body is not used in a partition member that separates at least a portion of the gas phase region and the liquid phase region and in a portion of the partition member that does not face the heat dissipation section and the heat receiving section .