JP2009162462A - Circulation type heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circulation type heat pipe capable of simplifying a structure by reducing the number of parts. <P>SOLUTION: The circulation type heat pipe includes a circulation passage 30 composing a circulation path, and arranged such that a length range of one part of the circulation path passes a low temperature part and another length range passes a high temperature part, a working fluid 32 sealed in the length range of the one part in the circulation passage 30, and a pair of check valves 34, 36 provided on both ends of a chamber of an optional length range passing through the low temperature part of the circulation passage 30 for regulating a circulation direction of the working fluid 32 in one direction. A height of one liquid level of a length range of a liquid phase portion 32b of the working fluid is set higher than a standard height 25 in a downstream side of the downstream side check valve 36 in the circulation passage 30, and a height of another liquid level of the length range of the liquid phase portion 32b of the working fluid is set lower than the standard height 25 in an upstream side of the upstream side check valve 34 in the circulation passage 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a circulation type heat pipe used for a heat transport system using a temperature difference between a high temperature part such as summer temperature and a low temperature part such as an underground temperature.

As a conventional circulation heat pipe, for example, there is a top heat circulation heat pipe used in a cooling system (see Patent Document 1). This conventional circulation type heat pipe relates to a top heat type heat pipe intended to be able to increase the height of the heat pipe, to operate stably, and a cooling system using the top heat type heat pipe. is there.
Japanese Patent Laid-Open No. 2005-221200

  However, the circulation heat pipe according to Patent Document 1 includes a heat exchange tank 11, a heat exchange zone 13, and a liquid storage tank 15, and a hot and cold liquid pipe 12, a cold and hot liquid pipe 14 that connect them, As the gas connection pipe 16 and the liquid supply pipe 17 are separately provided, the number of parts is increased and the structure thereof is complicated.

  Therefore, in view of the above problems, an object of the present invention is to provide a circulation type heat pipe capable of simplifying the structure by reducing the number of components.

In order to solve the above problems, the circulation type heat pipe according to the present invention is:
A circulation path that constitutes a circulation path, a part of the circulation path having a length range passing through the low temperature part, and another part of the length range passing through the high temperature part;
A working fluid sealed within a partial length range in the circulation line;
A pair of check valves provided at both ends of a room having an arbitrary length range passing through the low temperature portion of the circulation pipe, and for regulating the circulation direction of the working fluid in one direction;
The height of one liquid level in the length range of the liquid phase portion of the working fluid is set higher than a reference height on the downstream side of the check valve on the downstream side in the circulation line,
The height of the other liquid surface in the length range of the liquid phase portion of the working fluid is set lower than a reference height on the upstream side of the check valve on the upstream side in the circulation pipe. It is what.

The circulation heat pipe according to the present invention is
The check valve is
Provided in the middle of a length portion extending substantially in the vertical direction of the circulation pipe,
A partition that partitions the circulation pipe into an upstream side and a downstream side, and a valve body that closes a through-hole formed in the partition wall by its own weight from above is configured.
The valve body has a specific gravity that is the same as or slightly larger than the specific gravity of the liquid phase portion of the working fluid.

The circulation heat pipe according to the present invention is
Widen the horizontal area of the liquid surface portion of the liquid phase portion of the working fluid at a position in the high temperature portion of the circulation pipe that extends in a substantially vertical direction downstream from the downstream check valve. The evaporating tank is provided.

The circulation heat pipe according to the present invention is
A heat insulating material is wound in a predetermined length range from the low temperature portion to the high temperature portion on a length portion extending in a substantially vertical direction downstream from the downstream check valve in the circulation pipe. To do.

The circulation heat pipe according to the present invention is
A heat dissipating fin is provided at a position below the reference height in a length portion extending in a substantially vertical direction upstream from the upstream check valve in the circulation pipe. is there.

According to such a circulation type heat pipe according to the present invention,
A circulation path that constitutes a circulation path, a part of the circulation path having a length range passing through the low temperature part, and another part of the length range passing through the high temperature part;
A working fluid sealed within a partial length range in the circulation line;
A pair of check valves provided at both ends of a room having an arbitrary length range passing through the low temperature portion of the circulation pipe, and for regulating the circulation direction of the working fluid in one direction;
The height of one liquid level in the length range of the liquid phase portion of the working fluid is set higher than a reference height on the downstream side of the check valve on the downstream side in the circulation line,
The height of the other liquid surface in the length range of the liquid phase portion of the working fluid is set lower than a reference height on the upstream side of the check valve on the upstream side in the circulation line,
The structure can be simplified by reducing the number of parts.

Moreover, according to the circulation type heat pipe according to the present invention,
The check valve is
Provided in the middle of a length portion extending substantially in the vertical direction of the circulation pipe,
A partition that partitions the circulation pipe into an upstream side and a downstream side, and a valve body that closes a through-hole formed in the partition wall by its own weight from above is configured.
The valve body has a specific gravity that is the same as or slightly larger than the specific gravity of the liquid phase portion of the working fluid.
Operational responsiveness due to a change in temperature difference between the high temperature portion and the low temperature portion can be improved.

Moreover, according to the circulation type heat pipe according to the present invention,
Widen the horizontal area of the liquid surface portion of the liquid phase portion of the working fluid at a position in the high temperature portion of the circulation pipe that extends in a substantially vertical direction downstream from the downstream check valve. By providing an evaporating tank that
The efficiency of heat transport by the circulation heat pipe can be improved.

Moreover, according to the circulation type heat pipe according to the present invention,
By wrapping a heat insulating material in a predetermined length range from the low temperature portion to the high temperature portion on the length portion extending in the substantially vertical direction downstream from the downstream check valve in the circulation pipe,
The endothermic operation of the liquid phase portion of the working fluid can be rapidly reduced at the upper end portion of the heat insulating material within the predetermined length range.

Moreover, according to the circulation type heat pipe according to the present invention,
By providing a heat dissipating fin at a position below the reference height in the length portion extending in the substantially vertical direction upstream from the upstream check valve in the circulation line,
The efficiency of heat transport by the circulation heat pipe can be improved.

Hereinafter, the best mode for carrying out the circulating heat pipe according to the present invention will be specifically described with reference to the drawings.
FIG. 1 to FIG. 3 are diagrams which are referred to for explaining the circulation heat pipe 20 according to the first embodiment of the present invention.

Circulating heat pipe 20 according to the present embodiment is classified as a top heat type heat pipe.
As shown in FIG. 1, the circulation heat pipe 20 according to the present embodiment includes a circulation line 30, a working fluid 32, and two check valves 34 and 36.

  The circulation pipe 30 of the circulation heat pipe 20 includes pipes 38 and 40 arranged substantially in the vertical direction, a pipe 42 that connects the upper ends of the pipes 38 and 40, and the lower ends of the pipes 38 and 42. It comprises the pipe line 44 which connects parts, and, thereby, the circulation pipe line 30 comprises a circulation path. In addition to injecting the working fluid 32, the conduit 42 is provided with an inlet 45 for adjusting the pressure in the circulation conduit 30 or for making a vacuum. The injection port 45 is sealed with a lid 46.

  The circulation pipeline 30 is arranged so that a part of the circulation pathway is exposed above the ground surface 25 above the middle position in the length of each of the pipelines 38 and 40 arranged in the vertical direction. A length portion below the middle position in the length of each of the pipes 38 and 40 and a pipe 44 communicating with the lower ends thereof pass through the ground (low temperature part) at a predetermined depth. Has been placed.

  The circulation heat pipe 20 has a portion arranged so as to pass above the ground surface 25 in the circulation pipe 30, such as a room in a house (not shown) in summer or an outdoor unit of an air conditioner. It is installed to pass through.

  Further, the working fluid 32 of the circulation heat pipe 20 is enclosed in a circulation pipe 30, and in the circulation pipe 30, a gas phase portion 32 a that is in a gas phase state and a liquid phase state. The liquid phase portion 32b is divided and filled. The working fluid 32 is regulated by the action of the two check valves 34 and 36 in the circulation pipe 30 so that the working fluid 32 can circulate only in the clockwise direction in FIG. ing.

  As the working fluid 32, for example, in the order of the working temperature range from low to high, helium, hydrogen, neon, nitrogen, argon, methane, ethane, freon-22, ammonia, freon-21, freon-11. Freon-113, pentane, acetone, methanol, ethanol, heptane, water, naphthalene, dowsum A, sulfur, mercury, cesium, rubidium, potassium, sodium, lithium, calcium, lead, indium, silver, etc., or A mixture obtained by combining any of these working fluid substances can be used.

  The check valve 36 is provided on the lower end side of the length portion of the pipe line 40 extending in the vertical direction of the circulation pipe line 30. As shown in FIG. 2, the check valve 36 includes a partition wall 50 that divides the flow path in the pipe 40 into an upstream side (lower side in FIG. 2) and a downstream side (upper side in FIG. 2), and a spherical valve. A body 52 is provided. The partition wall 50 of the check valve 36 is formed with a valve body receiving portion 54 that is recessed downward and has a through hole 56 formed at the deepest portion thereof.

  The valve body 52 is loosely fitted so that it can easily enter and exit the valve body receiving portion 54, and the through weight 56 of the valve body receiving portion 54 is closed by its own weight. Thereby, the check valve 36 allows the direction in which the liquid phase portion 32b of the working fluid flows only from the upstream side to the downstream side (the direction from the lower side to the upper side in FIG. 2), and flows in the reverse direction. Is to be prohibited.

  Here, as shown in FIG. 1, the pressure of the gas phase portion 32 a of the working fluid 32 is represented by P <b> 1, and the liquid phase portion 32 b of the working fluid 32 includes the check valve 36. The pressure in the chamber inside the length portion sandwiched between the other check valve 34 provided in the crank-shaped channel 48 described later is represented by P2.

  Further, as shown in FIG. 2, the check valve 36 has a pressure W1 corresponding to the weight of the liquid phase portion 32b of the working fluid on the downstream side (upper side in the drawing), and the weight of the valve body 52 itself of the check valve 36. When G represents the reaction force of the check valve 36 from the valve body receiving portion 54 to the valve body 52, F1 represents that the liquid phase portion 32b of the working fluid passes through the check valve 36 downstream thereof. In order to achieve this, F1 needs to be 0, and therefore it is necessary to satisfy the relationship (P1 + W1 + G) <P2. Similarly, in the check valve 34 as shown in FIG. 3, which will be described later, since F2 needs to be 0, it is necessary to satisfy the relationship of (P2 + G) <(P1 + W2).

  In order to make it easy for the liquid phase portion 32b of the working fluid to pass through the check valve 36 downstream, the valve body 52 of the check valve 36 has substantially the same specific gravity as the liquid phase portion 32b of the working fluid. Those having a specific gravity that is slightly larger or slightly larger can be used.

  Further, as shown in FIG. 1, a crank-shaped flow path 48 is provided below the liquid level of the liquid phase portion 32 of the working fluid in a pipe line 38 arranged substantially in the vertical direction of the circulation pipe line 30. ing. The crank channel 48 is formed in a crank shape so that the channel of the liquid phase portion 32 b is folded twice in the length direction of the pipe 38 in the pipe 38.

  The crank-shaped flow path 48 has a liquid-phase portion 32b of the working fluid from the upstream side to the downstream side of the crank-shaped flow path 48 in the pipe 38 in the intermediate flow path portion 48a sandwiched between the two folded portions. The liquid phase portion 32b flows in a direction opposite to the flowing direction (direction from top to bottom in FIG. 1) (direction from bottom to top in FIG. 1).

  The check valve 34 is provided in the intermediate flow path portion 48a of the crank-shaped flow path 48 as described above, and allows the working fluid 32 to flow only in the direction from the upstream side to the downstream side, like the check valve 36. , It is prohibited to flow in the reverse direction. Since a room is formed inside the length range including the pipe line 44 between the check valve 34 and the check valve 36, the check valve 34, 36 is provided. As described above, the pressure in this room is represented by P2.

  Further, the height of the liquid surface portion 32 b of the working fluid 32 in the circulation heat pipe 20 is the ground surface 25 (reference height) on the downstream side of the check valve 36 in the conduit 40 of the circulation conduit 30. And is set below the ground surface 25 on the upstream side of the check valve 34 in the conduit 38 of the circulation conduit 30.

Next, the operation of the circulation heat pipe 20 will be described.
When the temperature above the ground surface 25 is higher than the temperature in the ground as in the summer, the liquid phase portion 32b of the working fluid in the circulation heat pipe 20 is in the pipeline 40 of the circulation pipeline 30. In the height range above the ground surface 25, the heat is absorbed from the surrounding air to evaporate from the liquid surface, and from the liquid phase portion 32b of the working fluid to the gas phase gas phase portion 32a. To change. The vapor phase portion 32 a of the working fluid 32 moves into the pipe line 42 of the circulation pipe line 30 and further moves into the pipe line 38 in a state where latent heat of vaporization is stored.

  The tip portion of the gas phase portion 32a of the working fluid that has moved into the pipe line 38 is cooled while passing through the underground length range of the pipe line 38, thereby condensing and liquefying. It changes to 32b. When the gas phase portion 32a of the working fluid is liquefied, the latent heat of condensation is released (radiated) into the ground.

  Further, the pressure P1 of the gas phase portion 32a of the working fluid in the pipeline 42 of the circulation pipeline 30 is such that the gas phase portion 32a evaporated from the liquid surface of the liquid phase portion 32b of the working fluid in the pipeline 40 expands. And act to push down the liquid level of the liquid phase portion 32b in the pipe 38.

  As a result, since the relationship of (P2 + G) <(P1 + W2) is satisfied, the liquid phase portion 32b flows through the check valve 34 into the pipe 44 between the check valves 34 and 36.

  When the state of evaporation from the liquid surface portion 32b of the working fluid in the conduit 40 continues, the liquid surface portion 32b in the conduit 40 falls, and as shown in FIG. It becomes the same height as the surface 25. Then, the amount of evaporation from the liquid surface of the liquid phase portion 32b in the conduit 40 is reduced, but the amount of liquefaction of the gas phase portion 32a due to heat dissipation in the conduit 38 is not reduced, and liquefaction due to heat dissipation continues. Become.

  For this reason, the pressure P1 of the gas phase portion 32a of the working fluid decreases, and eventually the relationship of (P1 + W1 + G) <P2 is satisfied, so that the liquid phase portion 32b in the conduit 44 passes through the check valve 36. Then, it flows downstream (upper side in the figure) from the check valve 36 in the pipe 40.

  As a result, the liquid level of the liquid phase portion 32b of the working fluid in the pipe line 40 is pushed up above the ground surface 25, so the range at a height above the ground surface 25 in the pipe line 40. The endothermic operation of the liquid phase portion 32 b is performed in the inside, and the evaporation is performed from the liquid surface of the liquid phase portion 32 b in the pipe line 40.

When the pressure P1 becomes higher than the pressure P2, the above operation is repeated.
The circulating heat pipe 20 continuously repeats the above-described operation, whereby the liquid phase portion 32b of the working fluid takes heat from the upper side of the ground surface 25, and the gas phase portion 32a of the working fluid heats to the underground side. The heat transport for supplying is continuously performed.

  According to the circulation type heat pipe 20 according to this embodiment, the circulation path of the working fluid 32 of the circulation type heat pipe 20 used in the cooling system can be configured with only one circulation line 30. Therefore, the number of parts can be reduced and the structure can be simplified.

  Further, according to the circulation heat pipe 20 according to the present embodiment, the check valve 34, 36 has a valve body 52 having a specific gravity that is the same as or slightly larger than the specific gravity of the liquid phase portion 32b of the working fluid. Since the liquid phase portion 32b can be easily passed through the check valves 34 and 36 by using the thing, the circulation type heat pipe by the change of the temperature difference between the air temperature and the temperature in the ground is finally obtained. 20 operational responsiveness can be improved.

  Further, according to the circulation heat pipe 20 according to the present embodiment, since the check valve 34 in the crank-shaped flow path 48 can be the same type as the check valve 36, the check valve 34 can be used. As a result, the circulation type heat pipe 20 can be operated smoothly.

Next, FIG. 5 is a figure referred in order to demonstrate the circulation type heat pipe 60 which concerns on the 2nd Embodiment of this invention.
The overlapping description of the same parts and configurations as those of the circulation heat pipe 20 according to the first embodiment will be omitted.

  The circulation type heat pipe 60 according to the present embodiment includes a circulation line 62 instead of the circulation line 30 of the circulation type heat pipe 20 according to the first embodiment, as shown in FIG. Is.

  The circulation pipe 62 communicates between pipes 64 and 66 arranged substantially in the vertical direction in the figure, a pipe 68 that connects the upper ends of the pipes 64 and 66, and a lower end of the pipes 64 and 66. The pipe line 70 is provided.

  A check valve 36 similar to the check valve 36 in the circulation heat pipe 20 according to the first embodiment is provided at the lower end of the circulation line 62 of the circulation line 62 in the figure. Further, an evaporation tank 72 is provided at a midway position above the ground surface 25 in the conduit 66 of the circulation conduit 62 to increase the horizontal area of the upper liquid surface of the liquid phase portion 32b of the working fluid. Yes.

  Further, the conduit 66 of the circulation conduit 62 has a length range from the continuous portion with the conduit 70 at the lower end portion in the drawing to the downstream side (upper portion in the drawing) to the slightly downstream side. A pipeline 66a, a pipeline 66b in the length range from the end downstream of the pipeline 66a to the evaporation tank 72, and a pipeline 66c in the length range from the evaporation tank 72 to the continuous portion of the pipeline 68 It is divided into and.

  The pipelines 66b and 66c in this pipeline 66 are formed so that the diameter becomes narrower than the pipeline 66a. Further, a capillary structure 74 (wick) is provided in the conduit 66b. The capillary structure 74 can be configured using a wire mesh such as copper, stainless steel, or nickel, felt, foam metal, fine wire, or sintered body.

  Further, a heat insulating material 76 is wound around the outer periphery of the conduit 66b in the conduit 66 over a length range from a predetermined depth in the ground to a predetermined height above the ground surface 25. The working fluid 32 in the conduit 66b cannot absorb the heat of the surrounding air in the length range in which the heat insulating material 76 is wound from the ground to the upper side of the ground surface 25.

  Next, the pipe 64 of the circulation pipe 62 is divided into two length ranges according to the size of the cross-sectional area. That is, the pipe 64 is a narrow-diameter pipe 64a having a length range from a continuous portion with the pipe 68 in the flow direction (vertical direction in the drawing) to a predetermined depth in the ground on the downstream side. The pipe 64 a is divided into pipes 64 b having a cross-sectional area larger than that of the pipe 64 a in the length range from the downstream end of the pipe 64 a to the continuous part with the pipe 70.

  Below the liquid level of the liquid phase portion 32b of the working fluid in the pipe 64b of the pipe 64, the crank-shaped flow path 48 and the check valve 34 in the circulation heat pipe 20 according to the first embodiment. A crank-shaped flow path 48 and a check valve 34 are provided as in FIG. A plurality of heat radiation fins 78 are provided at the upper end portion of the pipe line 64b closer to the pipe line 64a than the crank-shaped flow path 48.

  According to the circulation heat pipe 60 according to the present embodiment as described above, one circulation path of the working fluid 32 of the circulation heat pipe 60 used in the cooling system is used as in the first embodiment. Therefore, the number of parts can be reduced and the structure can be simplified.

  Further, according to the circulation type heat pipe 60 according to the present embodiment, the valve body 52 of the check valves 34 and 36 has the same specific gravity as the specific gravity of the liquid phase portion 32b of the working fluid or a slightly higher specific gravity. Since the liquid phase portion 32b can be easily passed through the check valves 34 and 36, the circulation type by the change of the temperature difference between the air temperature and the underground temperature can be obtained. The responsiveness in operation of the heat pipe 20 can be improved.

  Further, according to the circulation type heat pipe 60 according to the present embodiment, the diameter of the pipe line 66b in the pipe line 66 is made smaller than the diameter of the pipe line 66a in the pipe line 66, and the downstream side from the check valve 36. By reducing the weight of the liquid phase portion 32b of the working fluid (upper side in the drawing), the liquid phase portion 32b can further easily pass through the check valve 36.

  Further, according to the circulation type heat pipe 60 according to the present embodiment, the evaporation tank 72 is provided, and the horizontal area of the upper liquid surface of the liquid phase portion 32b of the working fluid is widened, thereby improving the efficiency of the evaporation action. Since it can improve, the efficiency of the heat transport by the said circulation type heat pipe 60 can be improved.

  Further, according to the circulation heat pipe 60 according to the present embodiment, the pipe 66b in the pipe 66 has a length range from a predetermined depth in the ground to a predetermined height above the ground surface 25. Since the heat insulating material 76 is wound around the outer periphery, the heat absorption operation of the liquid phase portion 32b of the working fluid can be rapidly reduced at the upper end portion of the heat insulating material 76 in the predetermined length range. .

  Further, according to the circulation type heat pipe 60 according to the present embodiment, a capillary structure 74 is provided in the conduit 66b, and the capillary structure 74 is made of a wire mesh such as copper, stainless steel or nickel, or felt. Since the liquid phase portion 32b of the working fluid flows downstream (upper side in the drawing), the liquid phase portion 32b flows due to capillary action. Efficiency can be improved.

  Further, by utilizing the capillary phenomenon in this way, the weight W1 of the liquid phase portion 32b of the working fluid downstream from the check valve 36 (upper side in the figure) is also reduced. From this point, the liquid phase portion 32b is also reduced. Can easily pass through the check valve 36.

  Further, according to the circulation type heat pipe 60 according to the present embodiment, a plurality of heat radiation fins 78 are provided at the upper end portion of the pipe line 64b in the pipe line 64 in the circulation pipe line 62, whereby the pipe line 64b. The heat dissipation efficiency can be increased by increasing the surface area of the inner and outer peripheral surfaces of the upper end. For this reason, the condensing action of the gas phase portion 32a of the working fluid is promoted, and the liquid phase portion 32b of the working fluid that adheres to and condenses on the inner peripheral surface of the pipe 64b is increased, and the heat generated by the circulation heat pipe 60 is increased. The efficiency of transportation can be improved.

  In the circulation heat pipe 60 according to the present embodiment, the evaporating tank 72, the capillary structure 74, the heat insulating material 76, and the heat radiating fins 78 are provided, but any of these is not provided. It may be.

  Further, in the circulating heat pipes 20 and 60 according to the first and second embodiments, a check valve having a structure including a plate-like partition wall 50 and a spherical valve body 52 as shown in FIG. 34, 36 have been used, but other structures different from such structures or other types of check valves may be used.

  In the circulation type heat pipes 20 and 60 according to the first and second embodiments, the two check valves 34 and 36 are provided. However, as another embodiment, the check valve 34 is provided. , 36 may be provided in parallel with bypass passages with on-off valves.

  According to the circulation type heat pipe in which a plurality of bypass passages with on-off valves are provided in parallel with each of the check valves 34 and 36, the liquid phase portion 32b of the working fluid 32 is in the summer. The open / close valve is closed so as not to pass through the bypass flow path, and the check valves 34 and 36 are used similarly to the circulation heat pipes 20 and 60 according to the first and second embodiments, and the top heat is used. It can be used in a cooling system as a mold heat pipe.

  Further, in the winter season, by opening the on-off valves of the bypass flow paths with on-off valves, the bypass flow in which the liquid phase portion 32b of the working fluid 32 opens the on-off valves without using the check valves 34, 36. By being able to pass through the road, it can be used as a heat transport system capable of transporting underground heat upward from the ground surface 25 as a bottom heat type heat pipe.

  In the first and second embodiments, the cooling system using the temperature difference between the air temperature and the underground temperature has been described. However, the invention of the present application is not limited to this, and the air temperature and the water temperature. It is also possible to apply the present invention to a heat transport system using the temperature difference between the water temperature, the water temperature and the water temperature, or the temperature difference between the air temperature and the air temperature.

It is a front sectional view showing circulation type heat pipe 20 concerning a 1st embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a check valve 36 shown in FIG. FIG. 2 is an enlarged cross-sectional view of a check valve 34 shown in FIG. It is front sectional drawing for demonstrating operation | movement of the circulation type heat pipe 20 shown in FIG. It is front sectional drawing which shows the circulation type heat pipe 60 which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

20 Circulating Heat Pipe 25 Ground Surface 30 Circulating Line 32 Working Fluid 32a Gas Phase Part of Working Fluid 32b Liquid Phase Part of Working Fluid 34, 36 Check Valve 38, 40, 42, 44 Pipe 45 Inlet 46 Lid 48 Crank-shaped flow path 50 Bulkhead 52 Valve body 54 Valve body receiving portion 56 Through hole 60 Circulating heat pipe 62 Circulating line 64, 64a, 64b, 66, 66a, 66b, 66c, 68, 70 Pipe line 72 Evaporating tank 74 Capillary tube Structure 76 Heat insulation material 78 Heat radiation fin

Claims (5)

A circulation path that constitutes a circulation path, a part of the circulation path having a length range passing through the low temperature part, and another part of the length range passing through the high temperature part;
A working fluid sealed within a partial length range in the circulation line;
A pair of check valves provided at both ends of a room having an arbitrary length range passing through the low temperature portion of the circulation pipe, and for regulating the circulation direction of the working fluid in one direction;
The height of one liquid level in the length range of the liquid phase portion of the working fluid is set higher than a reference height on the downstream side of the check valve on the downstream side in the circulation line,
The height of the other liquid surface in the length range of the liquid phase portion of the working fluid is set lower than a reference height on the upstream side of the check valve on the upstream side in the circulation pipe. Circulating heat pipe. The check valve is
Provided in the middle of a length portion extending substantially in the vertical direction of the circulation pipe,
A partition that partitions the circulation pipe into an upstream side and a downstream side, and a valve body that closes a through-hole formed in the partition wall by its own weight from above is configured.
The circulating heat pipe according to claim 1, wherein the valve body has a specific gravity that is the same as or slightly larger than the specific gravity of the liquid phase portion of the working fluid. Widen the horizontal area of the liquid surface portion of the liquid phase portion of the working fluid at a position in the high temperature portion of the circulation pipe that extends in a substantially vertical direction downstream from the downstream check valve. The circulating heat pipe according to claim 1, wherein an evaporating tank is provided. A heat insulating material is wound in a predetermined length range from the low temperature portion to the high temperature portion on a length portion extending in a substantially vertical direction downstream from the downstream check valve in the circulation pipe. The circulation type heat pipe according to any one of claims 1 to 3. The heat dissipating fin is provided at a position below the reference height in a length portion extending in a substantially vertical direction upstream from the upstream check valve in the circulation pipe. The circulation type heat pipe according to any one of 1 to 4.

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