KR20120006980A

KR20120006980A - Heat pipe

Info

Publication number: KR20120006980A
Application number: KR1020117021953A
Authority: KR
Inventors: 시게토시 다니가와
Original assignee: 가부시키가이샤 씨케이유; 시아이 가세이 가부시키가이샤
Priority date: 2009-02-24
Filing date: 2010-02-24
Publication date: 2012-01-19
Also published as: JPWO2010098338A1; WO2010098338A1; CN102334004A

Abstract

<Object> It aims at providing the heat pipe which returned a working liquid to the heating side quickly with a simple structure, and improves heat transportation efficiency.
<Solution> In the heat pipe 1 in which the working liquid 5 is enclosed in the container 2 in which the heating side 22 and the cooling side 24 are sealed, it is provided inside the container 2. The central pipe 3 is provided between the outer wall 31 of the central pipe 3 and the inner wall 21 of the container 2, and the outer wall 31 of the central pipe 3 and the container 2 are separated from each other. A (gap forming member) linear body 4 for forming an annular gap 6 is provided between the inner wall 21 and the capillary phenomenon. Moreover, the 1st taper part 32 and the 2nd taper part 33 which do not flow back into the clearance gap 6 side from the heating chamber 23 at the edge part of the center tube 3 are provided.

Description

Heat Pipe {HEAT PIPE}

The present invention relates to a heat pipe, and more particularly, to a heat pipe to improve the heat transportation efficiency by preventing the dry out of the working liquid in the container.

The basic structure of the heat pipe in the related art will be described. In Fig. 7, reference numeral 10 denotes a container, reference numeral 11 denotes a wick and reference numeral 12 denotes a working fluid. The container 10 is formed of a tubular body made of copper, aluminum, stainless steel, ceramics, or the like, and is formed by sealing both ends. The container 10 is currently proposed in various forms such as a circular tubular one or a flat tubular one. On the other hand, the wick 11 is composed of a mesh, a porous metal, or the like intertwining metal wires by refluxing to the heating side 10h of the working liquid 12 in the container 10 by capillary action. The working liquid 12 is made of a liquid such as, for example, freon, water, alcohol, and the like by allowing heat exchange to be repeated by vaporization and liquefaction in the container 10.

Next, the effect | action of the heat pipe comprised in this way is demonstrated. First, when one end side of the heat pipe (hereinafter referred to as the heating side 10h) is heated, the working liquid 12 enclosed in the container 10 is vaporized by the heat, and the hollow portion 10a in the container 10 is heated. Is passed to the other end side (hereinafter referred to as cooling side 10c). Then, the working liquid 12 transferred to the cooling side 10c liquefies there and penetrates into the wick 11 of the outer circumferential portion. Thereafter, the penetrating working liquid 12 moves to the heating side 10h by the capillary phenomenon of the wick 11, and is heated there again to repeat the same circulation. Thereby, it can use for a various hot air heater, for example, cooling a heating component (CPU etc.), such as a notebook computer.

However, in order to improve the heat transportation efficiency in such a heat pipe, it is necessary to speed up the circulation cycle of the working liquid. However, when a mesh-shaped wick or a porous metal is used, the return speed due to the capillary phenomenon is slowed down, so that if the feed rate due to vaporization becomes faster than the reflux speed, all of the working liquid evaporates. Will cause it.

For this reason, the structure of the heat pipe which made the reflux speed high is proposed variously. For example, Japanese Patent Laid-Open No. 5-264184 proposes a heat pipe as shown in FIG. 8. The heat pipe is provided with a central tubular flow path 102 in the center of the tubular container 101, and a plurality of peripheral tubular flow paths 103 are provided in the outer diameter portion thereof, and the working liquid is refluxed therein.

Moreover, in Unexamined-Japanese-Patent No. 2000-171181, as shown in FIG. 9, the groove | channel 104 and the groove | channel 105 are provided inside the tubular container 101, and the wick 11 is provided in the center side. It is proposed to do so. In this way, since the groove 11 of the wick 11 and the inner wall of the container 101 becomes a reflux path, there is a merit that the reflux capacity can be increased. 9 is sectional drawing in a heat pipe.

Patent Document 1: Japanese Patent Application Laid-Open No. 5-264184 Patent Document 2: Japanese Patent Application Laid-Open No. 2000-171181

However, a structure in which a peripheral tubular flow path, a groove, or the like is formed inside such a container causes the following problems.

That is, when the peripheral tubular flow path 103 or the groove 104 is formed, it is necessary to reflux the working liquid in the gap between the peripheral tubular flow path 103 or the groove 104. By the way, in order to cause the capillary phenomenon in the peripheral tubular flow path 103, since the inner diameter should be about 0.01 mm-0.25 mm, extremely fine processing is required. In particular, when the heat pipe is formed long, the processing becomes more difficult, and when this is bent, the gap may be blocked. In such a configuration, when the end portion of the heat pipe is heated, there is a possibility that the vaporized working liquid flows back along the peripheral pipe passage 103 of the outer circumference, which may reduce the heat transportation efficiency. .

Moreover, in the structure which forms the groove | channel 104 along the axial direction, or the groove | channel 105 in the inner wall of a container like patent document 2 (FIG. 9), in order to form a groove | channel in the inside of a small pipe about 1 mm in diameter, processing is needed. It is very difficult, and the problem that a machining cost enters also arises.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a heat pipe in which a working structure is quickly returned to the heating side with a simple configuration to improve heat transport efficiency even when a very small heat pipe is configured. It is done.

That is, in order to solve the said subject, the heat pipe formed by enclosing a working fluid in the inside of the container by which the heating side and the cooling side were sealed, the center pipe provided in the inside of the said container, and the outer wall of the said central pipe, It is provided between the inner wall of the container and to provide a gap forming member for forming an annular gap between the outer wall of the central tube and the inner wall of the container.

In this case, the gap forming member can be simply processed to be small. Therefore, when this is inserted into the container while the gap forming member is provided outside the center tube, a thin gap such as to cause a capillary phenomenon can be formed between the center tube and the container. . In addition, since there is no wick in the gap, it is possible to improve the heat transport efficiency by reducing the resistance when the working liquid is refluxed.

In this invention, the gap forming member is formed of a linear body.

In this way, a gap can be formed by a simple thing such as a wire or a fiber thread, and furthermore, the annular gap can be finely divided into the linear body to promote the capillary phenomenon. At this time, when the plastic body, fiber, etc. which have comparatively elasticity and little frictional resistance are used as a linear body, it can deform | transform corresponding to the clearance gap, and the resistance at the time of insertion can also be reduced.

Furthermore, on the heating side of the center tube, a first taper portion is provided which gradually reduces the opening width of the center tube from the heating side toward the cooling side and gradually reduces the gap between the center tube and the container from the cooling side toward the heating side.

In this way, the gas vaporized on the heating side can be surely guided to the inside of the center tube along the first tapered portion, and the working liquid which has been refluxed along the annular gap can be reliably guided to the heating side. This can prevent backflow of the working liquid. Moreover, the clearance of return can be made small in the 1st taper part, and the working liquid which liquefied and returned by this can be made into a spray shape, and the heat of the heating side can also be absorbed.

And when providing such a 1st taper part, it is comprised so that thickness may become thin from a base part toward a tip part.

If comprised in this way, the curvature in a front-end | tip part can be enlarged and the reverse flow of the vaporized hydraulic fluid can be prevented by making the front-end part serve as a valve.

Moreover, on the cooling side of a center tube, the 2nd taper part which gradually reduces the clearance gap between a center tube and a container from a cooling side toward a heating side is provided.

In this way, the working liquid liquefied on the cooling side can be surely guided to the gap along the second tapered portion.

And when providing such a 2nd taper part, it is comprised so that thickness may become thin from a base part toward a front end part.

By doing in this way, the curvature in a front-end | tip part can be enlarged and the reverse flow of the liquefied hydraulic fluid can be prevented by making the front-end part serve as a valve.

Moreover, in another invention, it can also mount so that the said 1st taper part may be covered by the edge part of the heating side in a center pipe, or it can be attached so that the above-mentioned 2nd taper part may be covered also with the edge part of the cooling side in a center pipe. It may be.

In this way, it is not necessary to process the end of the center tube, and it is also possible to form a gap with the container at the outer peripheral end of the first tapered portion or the second tapered portion to which the central tube is mounted.

According to the present invention, in a heat pipe in which a working liquid is sealed in a container in which a heating side and a cooling side are sealed, a center pipe provided inside the container, and between an outer wall of the center pipe and an inner wall of the container. By providing a gap forming member for forming an annular gap between the outer wall of the center tube and the inner wall of the container, the gap forming member is processed small and inserted into the outside of the center tube to insert the capillary phenomenon. It is possible to form a thin gap enough to cause an increase. In addition, since there is no wick in the gap, it is possible to improve the heat transportation efficiency by reducing the resistance during reflux of the working liquid.

1 is an axial cross-sectional view of a heat pipe in one embodiment of the present invention.
2 is a cross-sectional view taken along line BB of FIG.
3 is an axial cross-sectional view of a heat pipe in another embodiment.
4 is an axial cross-sectional view of a heat pipe in another embodiment.
5 is an axial cross-sectional view of a heat pipe in another embodiment.
6 is an axial cross-sectional view of a heat pipe in another embodiment.
7 is a heat pipe in a conventional example;
8 is a heat pipe in a conventional example;
9 is a heat pipe in a conventional example;

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described with reference to drawings. The heat pipe 1 in this embodiment is what made it possible to cool the heating location of an electronic device, for example, The hollow container 2 in which the both ends were sealed, and the inner hollow of the container 2 were carried out. The center tube 3 provided in the part, and the clearance gap forming member 4 for holding the center tube 3 in the container 2 with the predetermined clearance gap 6 are comprised. In this way, a very thin gap 6 is formed inside the container 2 by attaching the small gap forming member 4 to the outside of the center tube 3, whereby the gap 6 is formed. It is to reflux the working fluid (5) that caused the capillary phenomenon. Hereinafter, the structure of the heat pipe 1 in this embodiment is demonstrated in detail.

First, the container 2 constituting the heat pipe 1 is formed of a hollow metal member, a synthetic resin, or the like, and has a center tube having a gap forming member (in this embodiment, a linear body 4) mounted therein ( 3) It is made to enclose both ends in the state provided. The container 2 is made small in shape so that grooves, grooves, etc. are not present in the inner wall 21 so that the container 2 can be formed by as simple processing as possible (for example, metal injection molding or drill processing). As the outer diameter of this container 2, in this embodiment, it sets to about 1 mm of the outer diameter degree of the tip (outlet of a core) of a mechanical pencil, for example. In addition, although the container 2 of the heat pipe 1 in FIG. 2 has circular shape in cross section, it does not necessarily need to be circular shape, and the cross section may be rectangular shape. In addition, the inner wall 21 of the container 2 is not provided with a groove, a groove, or the like. However, when fine processing is possible, a groove or the like may be provided.

The central tube 3 provided inside the container 2 has a smaller external dimension than the inner diameter of the container 2, whereby the outer wall 31 of the central tube 3 and the inner wall 21 of the container 2 are formed. It is set to a dimension that can form a gap enough to cause a capillary phenomenon between and. For the gap 6 between the center tube 3 and the container 2, for example, when the inner diameter of the container 2 is set to 0.70 mm, the outer diameter of the center tube 3 is 0.45 mm (that is, the container). The clearance gap 6 with (2) is set to about 0.25 mm). Generally, when raising a liquid by a capillary phenomenon, about the rising height h of the liquid, it is calculated | required by following <Equation 1>. In addition, in <Equation 1>, the surface tension of the working fluid is T (N / m), the contact angle is θ, the working fluid density is ρ (kg / ㎥), the gravitational acceleration is g (㎨), and the gap is t ( m).

<Equation 1> h = 2Tcosθ / ρgt

Here, as a general surface tension, when the glass tube and water are combined at sea level (0 m above sea level), the height of the surface rise due to the surface tension is calculated.

T = 0.0728 (N / m)

θ = 20 °

ρ = 1000kg / ㎥

g = 9.80665

The height h of the liquid level rise when the container 2 is standing up is assumed to be h = 1.4 × 10 ⁻⁵ (m 2 / t). That is, in the case of using a glass tube with a gap size of 0.1 mm, the rise of the liquid level in the glass tube placed vertically is about 28 cm. Here, the case where the glass tube is erected vertically has been described. However, when the glass tube is placed vertically, the liquid level penetrates further, and when the inner wall 21 is a mirror surface structure as the container 2, the contact angle? Since it becomes small, it can penetrate a liquid surface more.

In addition, as a study for increasing the surface tension, it is sufficient to select the working fluid 5 or the material of the central tube 3 or the container 2 as appropriate, but for example, a liquid having a low density ρ as the working fluid. Ammonia (density = 0.6681 g / cm 3), methanol (density = 0.7918 g / cm 3), and the like can be used. In such ammonia and methanol, it can use at -80 degreeC-40 degreeC by the difference of each boiling point, and can use at 0 degreeC-150 degreeC in methanol.

In the case where the central tube 3 is mounted in the container 2, a constant indoor space can be formed on the heating side 22 and the cooling side 24. Here, the space provided in the heating side 22 is used as the heating chamber 23, and the space provided in the cooling side 24 is used as the cooling chamber 25. When attaching this center pipe 3 to the inside of the container 2, as a 1st Embodiment, the linear or spiral linear body 4 is attached to the outer wall 31 of the center pipe 3, and this state Insert the central tube (3) into the container (2). As such a linear body 4, in order to form the said gap 6 (gap about 0.25 mm), and to attach it to the outer periphery of the center pipe 3, and to make it easy to insert in the container 2, a metal wire B. Synthetic resin, fiber, etc. In addition, in FIG. 2, although the linear body 4 is attached to the outer three places of the center pipe 3 by 120 degree | times, this number is not specifically limited, Spiral of one linear body 4 You may wind up in a shape or you may wind four or more linear bodies 4 in a straight line or a spiral form. At this time, when the linear body 4 is mounted in the axial direction, there is a merit that the distance at which the working liquid 5 is refluxed by the capillary phenomenon is shortened and the reflux speed is increased. On the other hand, in the case of mounting in a spiral shape, there is a merit that it is not necessary to fix each of the linear bodies 4 at a certain angle of the central tube 3 as compared with the case of providing the linear bodies 4 in a straight line shape. Select appropriately according to the environment of use.

Moreover, when attaching the ship body 4 to the outer wall 31 of the center pipe 3 in this way, and inserting in the container 2, the inner wall 21 of the container 2 and the ship body 4 come into contact with each other, There is a possibility that the position of the linear body 4 is shifted or biased. In order to avoid this, the linear body 4 may be brought into close contact with the outside of the linear body 4 by welding or the like, but in the case of welding, swelling occurs due to the welding agent, and the central tube 3 is containerized. It may become impossible to insert in (2). Therefore, in order to prevent such a problem, first, the linear body 4 is inserted in the state which opened the both ends of the container 2, and the linear body 4 is taken out from both sides. And both ends of each linear body 4 are tensioned so that the linear body 4 may be arrange | positioned every fixed space | interval, In this state, the central tube 3 from inside of each linear body 4 into the container 2 in this state. Insert Then, the linear body 4 opened from the both ends of the container 2 is excised, the operating liquid 5 is sealed in the container 2, and both ends are sealed. In this way, since the center tube 3 is inserted in the state which tensioned both ends of the ship body 4, there exists a merit that the position of the ship body 4 may not shift when inserting the center pipe 3. .

The 1st taper part 32 is formed in the edge part at the side of the heating chamber 23 side of this center pipe 3. The first tapered portion 32 gradually reduces the inner diameter of the central tube 3 in the direction from the heating chamber 23 toward the cooling chamber 25 side (hereinafter referred to as the "gas transfer direction"), and further cools. The width | variety of the clearance gap 6 of the center tube 3 and the container 2 is made small from the chamber 25 toward the heating chamber 23 side (henceforth a "liquid reflux direction"). When this 1st taper part 32 is formed, a wedge-shaped member is inserted in the edge part by the side of the heating chamber 23 side of the center pipe 3, and it forms and forms an edge part. And if the some gap 6 is formed between the edge part which the said 1st taper part 32 opened, and the container 2, or the some gap 6 cannot be ensured, the said A plurality of grooves are provided at the end where the first taper portion 32 is opened, and the working fluid 5 is refluxed even when the tapered portion 32 is in contact with the inner wall 21 of the container 2. When such a first taper portion 32 is provided, vaporized streams vaporized in the heating chamber 23 flow into the central tube 3 through the inside of the first taper portion 32, and the cooling chamber 25 at a sound velocity. I can move it to the side. At this time, the vaporized streams which do not flow into the central tube 3 try to penetrate into the gap 6 outside the first tapered portion 32, but the pressure of most of the vaporized streams that have penetrated into the central tube 3 and the pressure thereof. It is pushed back by the pressure of the working fluid 5 refluxed. This makes it possible to prevent backflow of the vaporized streams. In addition, with respect to the first tapered portion 32, the tip portion is made relatively thinner than the base portion so as to have a function as a valve. That is, if the thickness of the first taper portion 32 is thick, it cannot be blocked when the vaporized stream flows back, but if the thickness of the first taper portion 32 is thinned, it can be functioned as a valve due to its bending, and thus vaporization. It is possible to prevent the reverse flow of the flow.

On the other hand, the 2nd taper part 33 is provided also in the edge part of the cooling chamber 25 side of this center pipe 3. As shown in FIG. 1, the second taper portion 33 reduces the inner diameter of the center tube 3 along the gas transfer direction, and furthermore, liquids the gap 6 between the center tube 3 and the container 2. It is provided so that the width | variety of the clearance 6 may be made along a reflux direction. In the case of forming the second tapered portion 33, the second tapered portion 33 is formed by applying pressure from the outer circumferential direction to narrow the end portion of the central tube 3. Similarly with respect to the second tapered portion 33, the thickness of the end portion thereof is made relatively thinner than that of the root portion, so as to have an effect as a valve. Thereby, when the liquefied working liquid 5 flows back, backflow can be prevented by the bending of the 2nd taper part 33. FIG.

And the working liquid 5 is enclosed in the container 2 comprised in this way. As such a working liquid 5, a liquid such as water, ammonia, alcohol, freon or the like can be used, and a liquid which can be vaporized in the heating chamber 23 is used. When such a liquid is enclosed, the working liquid 5 is enclosed in the container 2 in the state which made it vacuum previously, and the both ends of the container 2 are sealed after that.

Next, the effect | action of the heat exchange of the heat pipe 1 comprised in this way is demonstrated.

First, when the heating side 22 of the heat pipe 1 is heated, the working liquid 5 enclosed in the heating chamber 23 heats and vaporizes. This vaporized vaporized stream moves to the cooling chamber 25 side due to expansion, but since the first tapered portion 32 is provided, most vaporized streams flow into the central tube 3. And it moves to the cooling chamber 25 side by sound speed, and is cooled there. At this time, the working liquid 5 heated and vaporized in the heating chamber 23 tries to move to the cooling side 24 by the expansion, but along the first taper portion 32 where the thickness of the front end side becomes relatively thin. The vaporized working liquid 5 moves, and the valve-shaped first taper portion 32 tries to close by the pressure. Thereby, the working liquid 5 vaporized in the clearance gap 6 between the center tube 3 and the container 2 is prevented from flowing in, and the working liquid 5 can be made to pass only through the center tube 3.

Then, the transferred working fluid 5 of the vaporized image is transferred to the wide cooling chamber 25, where it is liquefied by cooling from the outside, and the inner wall 21 of the own weight or the container 2 is transferred. ) Is attached to the inner wall 21 of the container 2 by surface tension. When it becomes water droplets and adheres to the inner wall 21 in this way, the working liquid 5 is sucked by the surface tension in the inclination of the 2nd taper part 33, and the pressure of the vaporization flow conveyed from the center pipe 3 is carried out. And it is refluxed to the heating chamber 23 side by the surface tension. At this time, since the clearance gap 6 between the center tube 3 and the container 2 has the annular clearance of the same clearance width, the unbalance of surface tension can be eliminated, and also nothing conventionally provided with a mesh or the like is provided. Therefore, the working liquid 5 can be refluxed to the heating chamber 23 side at a very high speed.

Next, when the working fluid 5 is refluxed to the heating chamber 23 side, the working fluid 5 is guided to the first tapered portion 32, where there is a fog from the outlet narrowed by the first tapered portion 32. It is in a state and is ejected. At this time, heat from the heating side 22 is taken away and vaporized. Hereinafter, heat transfer efficiency can be improved by repeating the same cycle.

Thus, according to the said embodiment, the gap formation member which is the linear body 4 is provided in the container 2 outside of the center pipe 3, and the thin gap 6 which causes a capillary phenomenon with a simple structure is created. Can be formed. This eliminates the reflux of the working liquid 5 using the mesh as in the related art, thereby reducing the resistance during reflux and improving the heat transportation efficiency.

Moreover, especially in the said embodiment, the opening width of the center tube 3 is gradually reduced to the heating side 22 of the center tube 3 toward the cooling side 24 from the heating side 22, and the center tube ( Gas vaporized at the heating side 22 by providing the first taper portion 32 which gradually reduces the gap 6 between the 3) and the container 2 from the cooling side 24 toward the heating side 22. Can be reliably guided along the first taper portion 32 to the inside of the central tube 3, and the working fluid 5 which has been refluxed along the annular gap can be reliably guided to the heating side 22. . Thereby, backflow of the working liquid 5 can be prevented. Moreover, the clearance gap of return in the 1st taper part 32 can be made small, and the working liquid 5 liquefied and returned by this can be made into a spray shape, and the heat of the heating side 22 can also be absorbed. Will be.

Similarly, in the cooling side 24 of the center tube 3, the 2nd taper part 33 which gradually reduces the clearance 6 between the center tube 3 and the container 2 toward the heating side 22 from the cooling side 24 is shown. ), The working liquid 5 liquefied at the cooling side 24 can be surely guided to the gap 6 along the second tapered portion 33.

And when providing the 1st taper part 32 and the 2nd taper part 33, by making thickness thin toward the front-end | tip part, it can function as a valve and prevent backflow of the working liquid 5, and You can do it.

In addition, in the said embodiment, although the 1st taper part 32 and the 2nd taper part 33 are provided in the both ends of the center pipe 3, only the 1st taper part 32 is shown, as shown in FIG. You may provide it. Alternatively, as shown in FIG. 4, only the second taper portion 33 may be provided. 3, 4, etc., the same code | symbol as 1st Embodiment shall have the same structure.

Moreover, in the said embodiment, as 2nd taper part 33, as shown in FIG. 1 or FIG. 4, the inner opening width of the center pipe 3 is narrowed along a gas conveyance direction, and a center pipe along a liquid reflux direction. Although the width | variety of the clearance gap 6 between 3 and the container 2 was made into shape, as shown in FIG. 5, only the outer part of the center pipe 3 along the liquid reflux direction, the center pipe 3 and the container 2 are shown. You may provide the 2nd taper part which narrows the width | variety of the clearance gap 6 of a vortex.

Moreover, although the cooling chamber 25 was provided in the container 2 in the said embodiment, it is also possible to make it unnecessary to provide the cooling chamber 25. FIG. In this case, for example, as shown in FIG. 6, the central pipe 3 is provided to the edge part of the container 2, and the groove | channel which cut | disconnected the outer wall 31 part of the central pipe 3 to the hollow part is vaporized. The flow may be discharged.

In addition, in the said embodiment, although the 1st taper part 32 and the 2nd taper part 33 were formed integrally in the edge part of the center tube 3, the 1st taper part which has a structure similar to 1st Embodiment You may provide the 32 and the 2nd taper part 33, and attach it to the edge part of the center pipe 3. As shown in FIG. However, when such a 1st taper part 32 and 2nd taper part 33 are attached, since the width may spread to the outer side of the center pipe 3, this 1st taper part 32 and agent You may make it the clearance gap 6 of the center tube 3 and the container 2 in the edge part which the 2 taper part 33 expanded. In this case, the first tapered portion 32 and the second tapered portion 33 additionally attached also serve as the gap forming member.

Moreover, in the said embodiment, although the case where the heat pipe 1 of very thin diameter was formed was demonstrated, what is necessary is just to set the diameter to the dimension according to the use used. However, the clearance 6 between the center tube 3 and the container 2 needs to be set to a dimension that causes a capillary phenomenon of the working fluid 5.

Industrial availability

INDUSTRIAL APPLICABILITY The present invention can be used in the field of cooling a cooling object, including computers, semiconductors, and electronic components.

One … Heat pipe 2... container
21 ... Inner wall 22. Heating side
23. Heating chamber 24. Cooling side
25 ... Cooling chamber 3... Central tube
31 ... Outer peripheral portion 32. 1st taper part
33 ... Second tapered portion 4... Linear body (gap forming member)
5 ... Working fluid 6. gap

Claims

A heat pipe in which a working liquid is sealed in a container in which a heating side and a cooling side are sealed,
A central tube provided inside the container;
A heat pipe provided between an outer wall of the center tube and an inner wall of the container, and a gap forming member for forming an annular gap between the outer wall of the center tube and the inner wall of the container.

The method according to claim 1,
A heat pipe, wherein the gap forming member is composed of a linear body.

The method according to claim 1,
The center tube is provided with a first taper portion on the heating side that gradually reduces the opening width of the center tube from the heating side toward the cooling side and gradually reduces the gap between the center tube and the container from the cooling side toward the heating side. Heat pipe.

The method according to claim 1,
The center tube gradually reduces the opening width of the center tube from the heating side toward the cooling side on the heating side, and gradually reduces the gap of the container from the cooling side toward the heating side, and from the root portion toward the tip portion. The heat pipe formed by providing the 1st taper part which thinned.

The method according to claim 1,
The heat pipe, wherein the center pipe is provided on the cooling side with a second taper portion that gradually reduces the gap between the center tube and the container from the cooling side toward the heating side.

The method according to claim 3,
And the first taper is mounted to the central tube.

The method according to claim 5,
And the second taper is mounted to the central tube.