JPH0835786A - Rod-form loop type heat pipe - Google Patents

Abstract

PURPOSE:To provide a rod-form loop type heat pipe which is constituted to separate a steam passage through which refrigerant steam is raised and a liquid return passage through which a refrigerant condensed at a condensation part is returned and causeds flow-down of all the condensed refrigerant through the liquid-return passage, and provide an excellent heat transmission efficiency. CONSTITUTION:A vaporization part 5 is formed at the lower part of a vertical metallic pipe 3a having a lower end being closed and an upper end being opened and a condensation part 6 is formed at a metallic pipe 3b having two ends being closed and tilted. The opening upper part of the metallic pipe 3a at which the vaporization part 5 is arranged is protruded in the inner lower side of the metallic pipe 3b at which the condensation part 6 is arranged and the lower side of the tilting condensation part 3b forms a liquid reservoir 13. A liquid return part 9 through which the liquid reservoir part 13 and the vaporization part 5 are intercommunicated is located in the metallic pipe 3a at which the vaporization part 5 is arranged. The sectional area of the liquid return passage 9 is reduced to a value lower than that of the metallic pipe 3a at which the vaporization part 5 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a loop heat pipe for transferring heat from a heat source at a low position and having a high temperature to a place at a high position and having a low temperature.

[0002]

2. Description of the Related Art Geothermal heat is used to heat snow on a road surface or a parking lot, or to melt snow on a roof, or to prevent freezing of housing equipment. In this way, as a device to prevent snow melting and freezing by using geothermal heat, a refrigerant is enclosed inside a depressurized metal tube,
A heat pipe is used in which the lower part of the metal tube is an evaporation part of the refrigerant and the upper part is a condensation part of the refrigerant vapor. This heat pipe is buried in the ground, absorbs high-temperature geothermal heat from the deeply buried evaporation section, and transfers the heat to the condensation section buried near the low-temperature surface to heat it. As a structure of this heat pipe, conventionally, a single pipe type heat pipe 1 shown in FIG. 7 and a loop type heat pipe 2 shown in FIG. 8 are generally used.

As shown in FIG. 7, the single-pipe heat pipe 1 decompresses the inside of a metal pipe 3 such as a copper pipe or a stainless pipe,
Refrigerant 4 such as water or alcohol is enclosed in the metal tube 3
Has a structure in which the lower portion of the refrigerant is an evaporation portion 5 of the refrigerant 4 and the upper portion thereof is inclined obliquely upward to form a condenser portion 6 of the refrigerant vapor 4a. The single-pipe heat pipe 1 is vertically embedded in the ground to heat the evaporation part 5 by a high-temperature heat source deep in the ground,
The refrigerant 4 enclosed in the inside rapidly evaporates at a low temperature in a depressurized state, and the refrigerant vapor 4a rises in the vapor passage 7 and reaches the condenser portion 6.

Since the condensing section 6 is buried near the surface of the earth where the temperature is low, the rising refrigerant vapor 4a dissipates heat and condenses on its inner surface, and the refrigerant 4 condensed in the form of water drops forms the inner wall surface of the vapor passage 7. It is flown down by itself due to its own weight and returned to the evaporator 5. By rapidly repeating evaporation and condensation of the refrigerant 4 under reduced pressure in this manner, heat is continuously transferred from a heat source having a high temperature at a low position to a place having a low temperature at a high position.

The heat resistance of the single-pipe heat pipe 1 is large in a range where the temperature difference between the evaporation section and the condensation section is relatively small, and particularly in a range where there is a small temperature difference where snow is melted by utilizing the geothermal heat. There is a problem that the heat transfer efficiency becomes poor. The reason for this is that the refrigerant vapor 4a evaporated in the evaporation section 5 moves up the vapor passage 7 and the moving direction of the refrigerant 4 flowing down from the condenser 6 along the inner wall surface of the vapor passage 7 is the refrigerant vapor. 4a is pushed up because it is opposite to the rising direction and does not smoothly flow down, and the rising high temperature refrigerant vapor 4a comes into contact with the low temperature refrigerant 4 that has flowed down to remove heat.
This is because the temperature of the refrigerant vapor 4a is lowered by the time it reaches the condenser section 6.

Further, the loop type heat pipe 2 shown in FIG.
Is formed by forming a metal tube 3 in the shape of a rectangular frame having an upper part and a lower part inclined, and forming the evaporating part 5 storing the refrigerant 4 on the inclined lower part, and vaporizing the metal pipe 3 vertically communicating with the end part on the upper part. Passage 7
The slanted upper side is the condensing section 6, and the metal pipe 3 having a small pipe diameter and vertically communicating with the lower side is the liquid return passage 9. In this loop-type heat pipe 2, the heated refrigerant 4 of the evaporator 5 becomes refrigerant vapor 4a, which rises in a vapor passage 7 having a large pipe diameter as shown by an arrow and radiates heat in a condenser 6 having a low temperature. It condenses into the water droplet-shaped refrigerant 4. The condensed refrigerant 4 flows down the liquid return pipe 8a having a small pipe diameter and is returned to the evaporation unit 5, so that the refrigerant vapor 4a and the refrigerant 4 transfer heat while circulating in a square loop.

That is, the loop type heat pipe 2 has a vapor passage 7 in which the refrigerant vapor 4a rises and a liquid return passage 9 in which the refrigerant 4 that has radiated heat and condensed returns, are formed separately so as not to interfere with each other. Therefore, there is an advantage that the heat resistance is small and the heat transfer efficiency is excellent especially in the range where the temperature difference between the evaporation section and the condensation section is low.

However, this loop type heat pipe 2
Is shaped like a square frame, which makes it difficult to manufacture.
In addition, when burying a dozen meters or so in the ground as a snow melting device, a large hole must be dug, and the construction is troublesome. At present, the single pipe heat pipe 1 having poor heat transfer efficiency is used. ing.

In order to improve this point, the present inventor first developed a rod-shaped loop heat pipe (Japanese Patent Application No. 5-353).
741 specification example Figure 1). As shown in FIGS. 9 and 10, the rod-shaped loop heat pipe 10 decompresses the inside of the metal tube 3 and seals the refrigerant 4 therein. The structure is formed so as to be inclined obliquely upward and used as the condensing portion 6 of the refrigerant vapor 4a. Inside the vapor passage 7 between the evaporator 5 and the inclined condenser 6,
A small-diameter liquid return pipe 8 whose upper and lower ends are opened is integrally joined along the inner wall of the condenser portion 6 on the inclined direction side, and the inside is formed as a liquid return passage 9.

When the rod-shaped loop heat pipe 10 is buried in the ground to melt snow on the road surface 11, the evaporation part 5 is heated by a heat source in the ground having a high temperature, and the refrigerant 4 enclosed therein is This refrigerant vapor 4a evaporates rapidly under reduced pressure.
Goes up the steam passage 7 and reaches the condenser 6. The rising refrigerant vapor 4a dissipates heat and condenses on this inner surface, and the water droplet-shaped refrigerant 4 flows along the inclined condensing portion 6 and flows into the liquid return passage 9 provided at the lower portion of the condensing portion 6. It flows down and is returned to the evaporator 5.

As a result, the vapor passage 7 through which the refrigerant vapor 4a rises and the liquid return passage 9 through which the liquid of the refrigerant 4 condensed in the condenser 6 returns are formed separately, and the cross-sectional area of the vapor passage 7 is the liquid return. Since it is formed larger than the pipe 8, the steam passage 7
The vapor pressure inside becomes larger than that of the liquid return passage 9, and a loop-shaped refrigerant passage is formed as shown by an arrow. Therefore, the movement of the refrigerant 4 flowing down in the liquid return passage 9 is not hindered by the rising refrigerant vapor 4a, and the rising refrigerant vapor 4
Since the heat of a is not taken by the liquid of the flowing down refrigerant 4 and does not interfere with each other, the heat resistance is smaller than that of the single-tube heat pipe 1, and the heat transfer is achieved particularly in the range where the temperature difference between the evaporation section and the condensation section is low. Excellent efficiency.

However, when the snow melting experiment was conducted,
In the condensation state in the condensation unit 6, the amount of the refrigerant 4 condensed on the inner wall on the side of the road surface 11 having a low temperature is larger than the amount condensed on the inner wall on the underground side, and the refrigerant 4 in the form of water drops actually flows down. Even if it does, the whole does not flow into the liquid return passage 9, but a part flows down along the inner wall of the vapor passage 7. For this reason, the refrigerant 4 flowing down along the inner wall of the vapor passage 7 is increased by the ascending refrigerant vapor 4
There is a problem that the heat transfer efficiency is lowered because the refrigerant is pushed up by a and does not flow smoothly, and the high temperature refrigerant vapor 4a and the low temperature refrigerant 4 come into contact with each other to remove heat.

[0013]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and separates the vapor passage through which the refrigerant vapor rises from the liquid return passage through which the refrigerant condensed in the condenser returns and the condensed refrigerant is all returned to the liquid. It is intended to provide a rod-shaped loop heat pipe having an excellent heat transfer efficiency by flowing down a passage.

[0014]

The invention according to claim 1 of the present invention encloses a refrigerant inside a depressurized metal tube, the lower part of the metal tube is an evaporation part of the refrigerant, and the upper part is a condensation part of the refrigerant vapor. In the rod-shaped heat pipe, the evaporating part is formed in the lower part of the vertical metal pipe whose lower end is closed and whose upper end is opened, and the condensing part is formed in the inclined metal pipe whose both ends are closed, and the evaporating part is provided. The upper part of the opening of the metal tube is projected to the lower side in the metal tube provided with the condensing section, and the lower side of the inclined condensing section is used as a liquid pool section, inside or outside the metal tube provided with the evaporating section, A liquid return passage that connects the liquid reservoir and the vaporizer is provided, and the cross-sectional area of the liquid return passage is smaller than the cross-sectional area of the metal pipe provided with the vaporizer.

According to a second aspect of the present invention, in a rod-shaped heat pipe, a refrigerant is enclosed in a depressurized metal tube, the lower part of the metal tube is a refrigerant evaporation part, and the upper part is a refrigerant vapor condensing part. , The lower side is vertical, the upper side is inclined, the evaporating portion is formed on the closed lower end side, and the inclined upper end side is open. The inclined metal pipe is closed to form a condensing section, and the lower side of the inclined condensing section is used as a liquid pool. And a cross-sectional area of the liquid return passage is smaller than that of the metal pipe provided with the evaporation portion.

According to a third aspect of the present invention, there is provided a rod-shaped heat pipe in which a refrigerant is enclosed in a decompressed metal tube, the lower part of the metal tube is an evaporation part of the refrigerant, and the upper part is a condensation part of the refrigerant vapor. , Both ends are closed, the lower side is vertical and the upper side is inclined, the evaporation part is formed in the lower part of the metal pipe, and the inclined upper side is the condensing part. A double-tube structure is formed by inserting metal pipes with small outer diameters at both ends.The inner metal pipe is used as a vapor passage through which the refrigerant vapor rises, and the outer side is used as a liquid return passage. The cross-sectional area of the steam passage is smaller than that of the steam passage.

According to a fourth aspect of the present invention, there is provided a rod-shaped heat pipe in which a refrigerant is enclosed in a depressurized metal tube, the lower part of the metal tube is an evaporation part of the refrigerant, and the upper part is a condensation part of the refrigerant vapor. , A vaporization part is formed in the lower part of a vertical metal pipe with the lower end closed and the upper end opened, and a metal pipe with an inner diameter larger than the outer diameter is provided at the upper outer periphery of this metal pipe with a space between them. A condenser part, a lower part of the metal pipe provided with this condenser part is used as a liquid reservoir part, and a liquid return passage that connects the liquid reservoir part and the evaporator part is provided inside or outside the metal pipe provided with the evaporator part, A cross-sectional area of the liquid return passage is smaller than that of the metal pipe provided with the evaporation portion.

According to a fifth aspect of the present invention, there is provided a rod-shaped heat pipe in which a refrigerant is enclosed in a depressurized metal tube, a lower part of the metal tube is a refrigerant evaporation part, and an upper part is a refrigerant vapor condensing part. , Evaporating part is formed in the lower part of a vertical metal tube with both ends blocked, and a metal tube with an outer diameter smaller than this inner diameter is inserted at intervals inside the metal tube with a condensing part in the upper part. The inner metal pipe is used as a vapor passage through which the refrigerant vapor rises, and the outer side is used as a liquid return passage, and the cross-sectional area of the liquid return passage is smaller than the cross-sectional area of the vapor passage. It is what

[0019]

The rod-shaped loop heat pipe of the present invention is installed in a vertical direction, and the evaporation part is heated by a high temperature heat source located at a low temperature, and the refrigerant enclosed therein rapidly evaporates at a low temperature under reduced pressure. Then, this refrigerant vapor rises in the vapor passage and reaches the condenser. Since this condensing part is installed in a place with a low temperature, the rising refrigerant vapor radiates heat inside and condenses, and when the refrigerant in the form of water drops flows along the condensing part, It is stored in the provided liquid pool, flows into the liquid pool from here, flows down there, and is returned to the evaporation unit. In the case of a structure in which the metal pipe has a double pipe structure, the inside metal pipe is a vapor passage, the outside is a liquid return passage, and the liquid pool is not provided, the refrigerant condensed in the condensing portion evaporates through the liquid return passage. It is designed to return to the club. For this reason, since the vapor passage in which the refrigerant vapor rises and the liquid return passage through which the liquid of the refrigerant condensed in the condensing section returns are separated to form a loop-shaped refrigerant passage, they do not interfere with each other and heat is efficiently generated. Can be communicated.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. This rod-shaped heat pipe
10 is the reverse L of the vertical metal pipe 3a and the inclined metal pipe 3b.
The steam passage 7 is formed by joining in a letter shape. The vertical metal pipe 3a has a lower end closed and an upper end open, and the inclined metal pipe 3b has both ends closed, and a vertical cylindrical portion 12 is formed on the inclined lower side as shown in FIG. It is formed integrally. The open upper end of the metal tube 3a is inserted into the metal tube 3b by penetrating the bottom surface of the cylindrical portion 12.

The inside of the vapor passage 7 is decompressed and the refrigerant 4 is enclosed therein.
The structure is such that the upper portion of the inclined metal pipe 3b serves as the condensing portion 6 for the refrigerant vapor 4a. Further, the bottom of the cylindrical portion 12 through which the upper end of the metal tube 3a penetrates is used as a liquid reservoir 13. A small-diameter liquid return pipe 8 that communicates from the liquid reservoir 13 to the lower evaporation portion 5 along the inner wall of the metal pipe 3a is integrally joined to form a liquid return passage 9 inside. is there. The cross-sectional area of the liquid return passage 9 is smaller than that of the metal tube 3a provided with the evaporation section 7.

When the rod-shaped loop heat pipe 10 is buried in the ground to melt snow on the road surface 11, as shown in FIG. The enclosed refrigerant 4 rapidly evaporates under reduced pressure,
This refrigerant vapor 4a rises through the vapor passage 7 of the metal pipe 3a, and further rises diagonally in the inclined metal pipe 3b to reach the condenser section 6. The ascending refrigerant vapor 4a is transferred to the condenser 6
The amount of the refrigerant 4 condensed on the inner wall on the side of the road surface 11 having a low temperature is larger than the amount condensed on the inner wall on the ground side. The condensed refrigerant 4 in the form of water drops flows along the inner wall of the slanted metal tube 3b, collects in the liquid pool 13 formed in the lower part, and then flows down the liquid return passage 9 to be returned to the evaporator 5. Be done.

As a result, all the refrigerant 4 condensed in the condensing section 6 is accumulated in the liquid pool section 13 and returned to the evaporation section 5 through the liquid return passage 9 formed separately from the metal pipe 3a. A loop-shaped coolant passage is formed. Therefore, the metal tube 3a
In the vapor passage 7, the ascending refrigerant vapor 4a does not interfere with the refrigerant 4 that condenses and flows down in the liquid return passage 9, so that the heat resistance is small and the transfer efficiency can be improved.

In the above-described embodiment, the structure in which the upper end side of the liquid return pipe 8 communicating with the liquid reservoir 13 is once pulled out to the outside of the metal pipe 3a is shown. A structure communicating with the portion 13 may be used. In this structure, since the liquid return pipe 8 is not exposed to the outside, the refrigerant vapor 4a
Can be prevented from leaking.

FIGS. 3 to 5 show other embodiments of the present invention which are different from each other. The rod-shaped loop heat pipe of FIG.
As for 10, the evaporation part 5 is formed on the closed lower end side of the inverted L-shaped metal tube 3a in which the lower side is vertical and the upper side is inclined, and the inclined upper end side is open. On the outer side of the inclined upper side of the metal tube 3a, a metal tube 3b, which is closed at both ends and has an inner diameter larger than the outer shape, is inclinedly provided, and serves as a condensing section 6. Further, the lower side of the inclined condensing section 6 is used as a liquid pool section 13, in which the condensed refrigerant 4 is pooled. A small-diameter liquid return pipe 8 communicating from the liquid reservoir 13 to the lower evaporation portion 5 is integrally joined along the outer wall of the metal pipe 3a provided with the evaporation portion 5, and the inside thereof is connected to the liquid return passageway. 9 is used. Also, this liquid return passage 9
The cross-sectional area of is formed smaller than the cross-sectional area of the metal tube 3a provided with the evaporation part 7.

In this rod-shaped loop heat pipe 10, the refrigerant 4 in the evaporation part 5 is heated and rapidly evaporated, and the refrigerant vapor 4a rises through the vapor passage 7 of the metal tube 3a, and the inclined upper side. From, it flows into the outer metal tube 3b and reaches the condenser section 6. The refrigerant vapor 4a dissipates heat and condenses on the inner surface of the condensing portion 6, and the refrigerant 4 in the form of water drops forms the inclined metal tube 3
Flow along the inner wall of b.
Accumulate in Next, from here, the liquid return passage 9 provided along the outer wall of the metal tube 3a provided with the evaporation portion 5 flows down to be returned to the evaporation portion 5. Therefore, since the refrigerant vapor 4a rising in the vapor passage 7 of the metal tube 3a and the refrigerant 4 condensing and flowing down in the liquid return passage 9 form a loop-shaped refrigerant passage, the thermal resistance is small. The transmission efficiency can be improved.

A rod-shaped loop heat pipe 10 shown in FIG.
Of the inverted L-shaped metal tube 3a whose both ends are closed and whose lower side is vertical and whose upper side is inclined forms a vaporizing part 5 in the lower part, and the inclined upper side is a condensing part 6. . The metal pipe 3a having both ends smaller in outer diameter than the inner diameter with a space inside the vertical lower side of the metal pipe 3a.
b is inserted to form a double pipe structure, the inside of the metal pipe 3b is used as a vapor passage 7 through which the refrigerant vapor 4a rises, and the liquid return passage 9 is provided between the outside of the vapor passage 7 and the inside of the metal pipe 3a. Are formed. The cross-sectional area of the liquid return passage 9 is smaller than that of the evaporation section 7.

In the rod-shaped loop heat pipe 10, the refrigerant 4 in the evaporation portion 5 is heated and evaporated, and the refrigerant vapor 4a rises through the vapor passage 7 and reaches the further inclined upper condenser portion 6. . The refrigerant vapor 4a dissipates heat and condenses on the inner surface of the condensing portion 6, and the water droplet-shaped refrigerant 4 flows along the inner wall of the inclined metal pipe 3a, and further outside the vapor passage 7 and inside the metal pipe 3a. The liquid is returned to the evaporator 5 by flowing down the liquid return passage 9 formed between the two. Therefore, the vapor passage 7 of the metal tube 3b
Refrigerant vapor 4a rising inside and liquid return passage 9 outside this
Since a loop-shaped coolant passage that does not interfere with the coolant 4 flowing down is formed, the thermal resistance is small and the transfer efficiency can be improved.

A rod-shaped loop heat pipe 10 shown in FIG.
Has an evaporating portion 5 formed on the closed lower end side of the vertical metal tube 3a and an open upper end side. The upper side of the metal pipe 3a is used as a vapor passage 7, and a metal pipe 3b, which is closed at both ends and has an inner diameter larger than the outer shape, is provided outside the vapor passage 7 and serves as a condensing section 6. Further, the lower side of the condensing section 6 is used as a liquid pool section 13 to collect the condensed refrigerant 4. A small-diameter liquid return pipe 8 communicating from the liquid reservoir 13 to the lower evaporation portion 5 is integrally joined along the inner wall of the metal pipe 3a provided with the evaporation portion 5, and the inside of the liquid return passage 8 is connected to the liquid return passage. 9 is used.

In this rod-shaped loop heat pipe 10, the refrigerant 4 in the evaporator 5 is heated and evaporated, the refrigerant vapor 4a rises up through the vapor passage 7 of the metal tube 3a, and further from the upper end opening to the outside. It flows into the metal tube 3b and reaches the condenser section 6.
The refrigerant vapor 4a dissipates heat and condenses on the inner surface of the condenser 6,
The water-drop-shaped refrigerant 4 flows along the inner wall of the metal tube 3b, and collects in the liquid pool 13 formed in the lower part. Then, a loop-shaped refrigerant passage is formed from here along the inner wall of the metal tube 3a, flowing down in the liquid return passage 9 and returning to the evaporator 5.

A rod-shaped loop heat pipe 10 shown in FIG.
The refrigerant 4 is enclosed in the lower part of the vertical metal tube 3a whose both ends are closed to form the evaporation part 5 there, and the upper part is the condensation part 6. A metal tube 3b having an outer diameter smaller than the inner diameter and having both ends opened is inserted inside the metal tube 3a to form a double-tube structure.
The vapor return passage 7 has a rising a, and a liquid return passage 9 is formed between the outside of the vapor passage 7 and the inside of the metal pipe 3a.

In this rod-shaped loop heat pipe 10, the refrigerant 4 in the evaporation portion 5 is heated and rapidly evaporated, and the refrigerant vapor 4a rises through the vapor passage 7 and the metal pipe 3a from the upper end opening. Reach the condenser 6. The refrigerant vapor 4a dissipates heat and condenses on the inner surface of the condensing portion 6, and the water droplet-shaped refrigerant 4 flows along the inner wall of the metal pipe 3a, and further between the outside of the vapor passage 7 and the inside of the metal pipe 3a. The refrigerant vapor 4a that flows down through the liquid return passage 9 formed in
A loop-shaped coolant passage is formed so that the coolant 4 that flows down does not interfere with each other.

In the above embodiment, the case where the rod-shaped loop heat pipe of the present invention is buried in the ground and applied to a snow melting device or an antifreezing device utilizing geothermal heat is used as a heat dissipation device or a waste heat recovery device. It can also be applied to other heat transfer devices.

[0034]

As described above, according to the rod-shaped loop heat pipe according to the present invention, since the vapor passage and the liquid return passage are formed integrally into an integral rod shape, the manufacture and construction are easy. Moreover, the vapor passage in which the refrigerant vapor rises and the liquid return passage through which the liquid of the refrigerant condensed in the condenser returns are completely separated, and a loop-shaped circulation passage is formed in which all the condensed refrigerant flows down the liquid return passage. Since it has excellent heat transfer efficiency, it is particularly effective for a snow melting device or an antifreezing device that transfers heat in a range of low temperature difference such as geothermal heat.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a rod-shaped loop heat pipe according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of the heat pipe shown in FIG.

FIG. 3 is a vertical sectional view of a heat pipe according to another embodiment of the present invention.

FIG. 4 is a vertical sectional view of a heat pipe according to another embodiment of the present invention.

FIG. 5 is a vertical sectional view of a heat pipe according to another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a rod-shaped loop heat pipe according to another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a conventional single tube heat pipe.

FIG. 8 is a vertical cross-sectional view showing a conventional square frame loop heat pipe.

FIG. 9 is a vertical cross-sectional view showing a conventional rod-shaped loop heat pipe.

10 is a horizontal sectional view of the rod-shaped loop heat pipe shown in FIG.

[Description of sign]

 1 Single Tube Heat Pipe 2 Loop Heat Pipe 3 Metal Tube 3a Metal Tube 3b Metal Tube 4 Refrigerant 4a Refrigerant Vapor 5 Evaporator 6 Condenser 7 Vapor Passage 8 Liquid Return Pipe 9 Liquid Return Passage 10 Rod Loop Heat Pipe 11 Road Surface 12 Cylindrical part 13 Liquid pool part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Tomita 9 Tennohara, Matsukawa-cho, Fukushima City, Fukushima Prefecture Kitashiba Electric Co., Ltd. (72) Hiroyuki Sato 9th Tennohara, Matsukawa-cho, Fukushima City, Fukushima Prefecture Kitashiba Electric Co., Ltd. Within

Claims (5)

[Claims] 1. A refrigerant is sealed inside a depressurized metal tube,
In a rod-shaped heat pipe in which the lower part of the metal tube is the evaporation part of the refrigerant and the upper part is the condensation part of the refrigerant vapor, the evaporating part is formed in the lower part of the vertical metal tube with the lower end closed and the upper end opened, and both ends are closed. A condensing part is formed on the inclined metal pipe, and the opened upper part of the metal pipe provided with the evaporating part is projected to the lower side in the metal pipe provided with the condensing part, and the lower part side of the inclined condensing part is A liquid return passage is provided inside or outside of the metal pipe provided with the evaporation portion, and the liquid return passage communicating the liquid accumulation portion and the evaporation portion is provided, and the cross-sectional area of the liquid return passage is provided with the evaporation portion. A rod-shaped loop heat pipe that is smaller than the cross-sectional area of a metal tube. 2. A refrigerant is sealed inside a depressurized metal tube,
In a rod-shaped heat pipe in which the lower part of the metal pipe is the evaporation part of the refrigerant and the upper part is the condensation part of the refrigerant vapor, the lower part is vertical and the upper part is inclined, the evaporating part is formed on the closed lower end side, and the inclined upper end side is open. On the outside of the inclined upper side of the metal tube, a metal tube whose inner diameter is larger than this outer shape is closed at an interval and is inclined, and this is used as a condensing section, and the lower side of this inclined condensing section is A liquid return passage is provided inside or outside of the metal pipe provided with the evaporation portion and provided with the evaporation portion, the liquid return passage communicating the liquid accumulation portion and the evaporation portion, and the cross-sectional area of the liquid return passage is provided with the evaporation portion. A rod-shaped loop heat pipe that is smaller than the cross-sectional area of a metal tube. 3. A refrigerant is enclosed inside a depressurized metal tube,
In a rod-shaped heat pipe in which the lower part of the metal pipe is the evaporation part of the refrigerant and the upper part is the condensation part of the refrigerant vapor, both ends are closed, the lower part is vertical and the upper part is inclined to form the evaporation part in the lower part of the metal pipe. The metal tube with the upper part as the condensing part is inserted into the vertical lower part at intervals with a metal tube with an outer diameter smaller than this inner diameter open to form a double tube structure. A rod-shaped loop heat pipe, characterized in that a vapor passage through which a refrigerant vapor rises is formed, and an outer side thereof serves as a liquid return passage, and a cross-sectional area of the liquid return passage is smaller than a cross-sectional area of the vapor passage. 4. A refrigerant is sealed inside a depressurized metal tube,
In a rod-shaped heat pipe in which the lower part of the metal tube is the evaporating part of the refrigerant and the upper part is the condensing part of the refrigerant vapor, the evaporating part is formed in the lower part of the vertical metal tube with the lower end closed and the upper end opened. Provide a metal tube with an inner diameter larger than this outer shape and closed at both ends on the outer circumference of the upper part to make it a condensing part,
A lower portion of the metal pipe provided with the condensing portion serves as a liquid reservoir portion, and a liquid return passage that connects the liquid reservoir portion and the evaporation portion is provided inside or outside the metal pipe provided with the evaporation portion. Has a cross-sectional area smaller than that of the metal tube provided with the evaporation portion. 5. A refrigerant is sealed inside a depressurized metal tube,
In a rod-shaped heat pipe in which the lower part of the metal tube is the evaporation part of the refrigerant and the upper part is the condensation part of the refrigerant vapor, the evaporating part is formed in the lower part of the vertical metal tube whose both ends are closed, and the condensing part is formed in the upper part. A metal tube whose outer diameter is smaller than this inner diameter is placed inside the tube with a space between both ends to form a double-tube structure.The metal tube inside this is used as a vapor passage through which the refrigerant vapor rises. A rod-shaped loop heat pipe, wherein the liquid return passage has a cross-sectional area smaller than that of the vapor passage.