JP2001272189A - Heat pipe and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convenient heat pipe having no possibility of rupture even if a supercritical fluid is employed as a heat carrying medium, and a method of manufacturing the same. SOLUTION: The heat pipe is manufactured by a method comprising a step for making, at the opposite ends of a planar extrusion pipe 1 having a plurality of interconnection holes 2, lateral holes 5 for interconnecting the interconnection holes 2, a step for making an inlet 10 for filling the extrusion pipe 1 with fluid, a step for sealing the opening of the lateral holes 5 communicating directly with the outside except that used as the inlet 10, a step for sealing the opening of the interconnection holes 2 communicating directly with the outside except that used as the inlet 10, and a step for injecting fluid from the inlet 10 and then sealing the inlet 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe for transferring heat. Such a heat pipe is
For example, it is used for heat radiation in a thin OA device including a heating element such as a notebook personal computer. FIG.
2 shows an example in which heat generated from the CPU 31 is transferred to the location of the fan 32 by the heat pipe 33 inside the notebook personal computer 30. In this way, even if the heating element and the heat radiating means have to be arranged separately, smooth heat radiation can be achieved.

[0002]

2. Description of the Related Art Conventionally, a flat type heat pipe is shown in FIG.
As shown in (1), it has been realized by using an extruded tube 1 which is a plate-like body having a plurality of communication holes 2 and flowing some kind of fluid for conveying heat into the inside thereof. At both ends of the extruded tube 1, a manifold 3 as shown in FIG. 20 is covered and adhered as shown in FIG. And it could be connected.

[0003] The material of the extruded tube 1 is, for example, an aluminum alloy. For use as a heat pipe, a thin type having a total thickness of 2 mm or less and a diameter of the communication hole 2 of 1 mm or less has been realized. I have. This extruded tube 1
In itself, under the above-mentioned thinness, the individual communication holes 2 are sufficiently thin, and the flow paths are dispersed in a plurality of lines.
It had a structure that could withstand a certain high pressure.

[0004]

On the other hand, "supercritical", which has been attracting attention in recent years, refers to a liquid phase and a gas phase obtained by bringing a familiar gas into a state of a certain temperature and a certain pressure or more. Is an intermediate state. Fluids in a supercritical state (hereinafter referred to as “supercritical fluids”) have extremely low viscosity, and when they are used as a heat transfer medium, they can easily be used in a path without using driving means such as a fan. Circulate. Therefore, utilization of a supercritical fluid as a heat transfer medium in a heat pipe is expected.

However, in the conventional heat pipe using the manifold 3 as shown in FIG. 21, the bonding portion 4 is not actually completely closed by the adhesive, but includes voids. . Fluid tends to enter such gaps. Particularly, since the supercritical fluid is generally at a high pressure, even if the extruded tube 1 itself can withstand the high pressure as described above, if the fluid enters the gap of the bonding portion 4, the area of the bonding portion 4 is reduced. FIG. 22,
As shown in FIG. 23, a large load is applied to the manifold 3 outward, and the manifold 3 or a connection portion between the extruded tube 1 and the manifold 3 may be broken.

[0006] In addition, when the heat transfer medium is circulated through an external pipe, it is necessary to take into consideration the prevention and breakage of the heat transfer medium in and out of the connection portion and the prevention of leakage, which is inconvenient in handling.

Accordingly, an object of the present invention is to provide a heat pipe which is free from breakage even when a supercritical fluid is used as a heat transfer medium and is easy to handle, and a method for manufacturing the same.

[0008]

In order to achieve the above object, a method for manufacturing a heat pipe according to the present invention is characterized in that, at both ends of a plate having a plurality of communication holes, horizontal holes connecting the communication holes to each other are formed. A step of piercing, a step of forming a sealing port for providing a sealing port for introducing a fluid into the interior of the plate-like body, and a lateral hole opening part in which the lateral hole directly communicates with the outside world, which is used as the sealing port. And a sealing hole for sealing the communication hole, and a communication hole sealing step for sealing any of the communication hole openings that directly communicate with the outside world except for those used as the sealing ports. And a fluid sealing step of injecting a fluid from the sealing port to seal the sealing port.

By adopting the above-mentioned structure, since both the lateral hole opening and the communication hole other than those used as the sealing port are sealed, it is not necessary to use a conventional manifold. Since it is possible to directly inject a fluid, the possibility of breakage or leakage due to insufficient strength of the connection portion can be reduced. Therefore, a highly reliable heat pipe that does not break even when used under high pressure conditions such that the fluid enclosed therein becomes a supercritical state can be manufactured.

In the above invention, preferably, the sealing port forming step includes fitting a joint pipe having an outer diameter substantially equal to the inner diameter of the communication hole into a part of the communication hole openings so as to partially project outward. And fitting a sealed tube having an inner diameter substantially equal to the outer diameter of the joint tube to a portion of the joint tube that protrudes outward from the communication hole opening.
Externally brazing a portion where the sealing tube and the plate-shaped body are in contact with each other.

[0011] By adopting the above configuration, since the external piping used for sealing the fluid is not inserted directly into the plate-shaped body but connected through a joint pipe, the inner diameter of the communication hole of the plate-shaped body is reduced. Even if the outer diameter of the outer pipe is smaller than that of the outer pipe, connection becomes possible, and it is possible to manufacture a thinner heat pipe than before. In addition, since the joint pipe is inserted from the opening of the communication hole, it can be connected and injected with fluid without preventing the flow path of the fluid that operates inside.

Alternatively, in the above invention, preferably
The enclosing port forming step includes a lateral hole enclosing port forming step of forming a part of the lateral hole opening as an enclosing port.

By adopting the above configuration, a fluid can be sealed from the sealing hole formed based on the opening of the horizontal hole, and a heat pipe having sufficient strength can be provided because a conventional manifold is not used. Can be manufactured.

More preferably, in the above-mentioned invention, in the lateral hole filling port forming step, a part of a joint pipe having an outer diameter substantially equal to the inner diameter of the lateral hole is partially projected outward from a part of the lateral hole opening. And fitting a sealed tube having an inner diameter substantially equal to the outer diameter of the joint tube to a portion of the joint tube projecting outward from the lateral hole opening. Externally brazing a portion in contact with the plate-like body.

By adopting the above configuration, since the external pipe used for sealing the fluid is not directly inserted into the plate-shaped body but connected via a joint pipe, the inner diameter of the horizontal hole of the plate-shaped body is reduced. Even if the outer diameter of the outer pipe is smaller than that of the outer pipe, connection becomes possible, and it is possible to manufacture a thinner heat pipe than before.

In the above invention, preferably, the enclosing port forming step is such that, at an end portion of the plate-like body, a part including the communication hole, which is to be an enclosing port, is left as a tubular projection, and another part is formed. Includes a step of cutting a fixed length from the end.

By adopting the above configuration, the tubular projection can be formed as an integral body, so that it has sufficient strength, even if the fluid is injected at a high pressure or becomes high during use. Thus, a heat pipe that is difficult to break can be manufactured.

The above-mentioned invention further preferably includes a step of rounding the tubular projection to process the cross-sectional shape of the tubular projection into a substantially circular shape. By adopting this configuration, the connection with the external pipe can be made easier, and the heat pipe can be manufactured efficiently.

More preferably, in the above invention, the fluid is carbon dioxide. By adopting this configuration, it is possible to easily make the carbon dioxide as the internal fluid into a supercritical state, and to manufacture a heat pipe that does not adversely affect the environment.

In order to achieve the above object, a heat pipe according to the present invention is provided in a plate-like body having a plurality of communicating holes connected to each other so as to be in a supercritical state under temperature and pressure in a use environment. The fluid was filled at the initial temperature and pressure and sealed.

By adopting the above configuration, there is no longer a need to take the fluid in and out when the fluid is used, and the handling becomes easy. Further, under the use environment, the viscosity of the fluid is extremely low because the internal fluid naturally becomes a supercritical state.
As a result, a heat pipe as a heat transfer medium that can transfer heat in a path without using a driving unit such as a fan is provided.

In the above invention, preferably, a joint pipe having an outer diameter substantially equal to the inner diameter of the communication hole is fitted into an opening of the communication hole to the outside so that a part thereof projects outward. An outwardly protruding portion of the joint pipe is fitted with an enclosing pipe having an inner diameter substantially equal to the outer diameter of the joint pipe, and is brazed from the outside at a place where the enclosing pipe and the plate-like body are in contact with each other, The tip of the enclosure tube is closed.

By adopting the above configuration, the heat pipe can be manufactured without using a manifold, and the heat pipe can withstand high pressure. Also, since the external pipe used for sealing the fluid is not inserted directly into the plate-shaped body but connected through a joint pipe, the inner diameter of the communication hole of the plate-shaped body becomes smaller than the outer diameter of the external pipe. Even
Connection becomes possible, and it becomes possible to make a heat pipe thinner than before. Since the joint pipe is inserted from the opening of the communication hole, it does not prevent the flow path of the fluid in which the joint pipe operates.

In the above invention, preferably, a joint pipe having an outer diameter substantially equal to the inner diameter of the lateral hole is fitted into an opening of a part of the lateral hole to the outside so that a part projects outward. An outwardly protruding portion of the joint pipe is fitted with an enclosing pipe having an inner diameter substantially equal to the outer diameter of the joint pipe, and is brazed from the outside at a place where the enclosing pipe and the plate-like body are in contact with each other, The tip of the enclosure tube is closed.

By adopting the above configuration, the heat pipe can be manufactured without using a manifold, and a heat pipe which can withstand high pressure can be obtained. Also, since the external pipe used for sealing the fluid is not inserted directly into the plate-shaped body but connected through a joint pipe, the inner diameter of the communication hole of the plate-shaped body becomes smaller than the outer diameter of the external pipe. Even
Connection becomes possible, and it becomes possible to make a heat pipe thinner than before.

In the above invention, preferably, at the end of the plate-like body, a part including the communication hole is left as a tubular projection, and the other part is cut away from the end by a fixed length. . By adopting this configuration,
Since the tubular protrusion is formed as an integral body, a heat pipe having sufficient strength and hard to break even when a fluid is injected at a high pressure or becomes a high pressure during use can be obtained.

In the above invention, preferably, the cross-sectional shape of the tubular projection is substantially circular. By adopting this configuration, connection with the external pipe can be made easier, and a heat pipe that can be efficiently manufactured can be obtained.

In the above invention, more preferably, the fluid is carbon dioxide. By adopting this configuration, carbon dioxide, which is an internal fluid, can be easily brought into a supercritical state, and a heat pipe that does not adversely affect the environment can be obtained. ,

[0029]

(Embodiment 1) (Manufacturing method) A manufacturing method of a heat pipe according to the present embodiment will be described with reference to FIGS.

First, FIG. 1 is a cross-sectional view of the extruded tube 1 shown in FIG. 19 taken along the line II. The extrusion tube 1 has a plurality of communication holes 2 penetrating in the longitudinal direction. This extruded tube 1
Next, as shown in FIG. 2, horizontal holes 5 connecting the communication holes 2 to each other are formed in the vicinity of both ends in the longitudinal direction and at positions away from both ends by a distance necessary for a press performed in a later step. Side hole 5
Can be made with a drill or the like. Communication hole 2
The opening 7 that directly communicates with the outside is hereinafter referred to as a “communication hole opening”, and the opening 8 that the lateral hole 5 directly communicates with the outside is hereinafter referred to as a “lateral hole opening”.

As shown in FIG. 3, some of the communication hole openings 7
A joint pipe 6 having an outer shape substantially equal to the inner diameter of the communication hole 2 is fitted so that a part thereof projects outward. A part of the communication hole opening 7 into which the joint pipe 6 is fitted is for forming a sealing port.
It is necessary to seal the other communication hole opening 7 and the horizontal hole opening 8. Therefore, as shown in FIG. 4, the communication hole openings 7 other than those used as the sealing ports are sealed by pressing. As shown in FIG. 5, the horizontal hole opening 8 is not used as a sealing port in this example, so that it is entirely sealed. In this example, the lateral hole opening 8 is sealed by padding and brazing from the outside, but may be sealed by other methods.

Further, as shown in FIG. 5, a sealing tube 9 having an inside diameter substantially equal to the outside diameter of the joint tube 6 is fitted into a portion of the joint tube 6 projecting outward from the communication hole opening 7 and sealed. The part where the pipe 9 and the extruded pipe 1 are in contact is brazed from the outside. Thus, the sealing port 10 is formed. FIG. 6 is an enlarged view of a portion including the sealing port 10. As shown by an arrow in FIG. 6, carbon dioxide as a fluid is injected from the sealing port 10,
The sealing port 10 is sealed as shown in FIG. Specifically, the tip of the sealing tube 9 is pressed and closed. In this manner, carbon dioxide as a fluid is sealed in the inside of the extruder tube 1. The initial temperature and the initial pressure at the time of the sealing are such that the carbon dioxide is in a supercritical state in the use environment of the heat pipe to be manufactured in this manner. Temperature and initial pressure. After the sealing, unnecessary portions before the sealing portion 13 are cut off.

(Configuration) The heat pipe in the present embodiment is obtained by the above-described manufacturing method. That is, this heat pipe has an initial temperature and an initial pressure such that a supercritical state is established under a temperature and a pressure in a use environment inside an extruded tube 1 as a plate having a plurality of communication holes 2 connected to each other. Is filled with carbon dioxide as a fluid and sealed. In addition, a joint pipe 6 having an outer diameter substantially equal to the inner diameter of the communication hole 2 is fitted into an opening of the communication hole 2 to the outside so that a part thereof projects outward,
An outwardly protruding portion of the joint pipe 6 is fitted with a sealing pipe 9 having an inner diameter substantially equal to the outer diameter of the joint pipe 6.
And the plate 1 is brazed from the outside to
The tip of the sealing tube 9 is closed.

(Operation / Effect) According to the structure of the heat pipe and the method of manufacturing the same described above, since the conventional manifold 3 (see FIG. 21) is not used, there is a possibility of breakage or leakage due to insufficient strength of the connection portion. Can be reduced. as a result,
It is possible to provide a highly reliable heat pipe that does not break even when used under the condition that the fluid enclosed therein is in a supercritical state.

Since the external pipe used for sealing the fluid is not inserted directly into the extruded pipe 1 but is connected via a joint pipe 6, the inner diameter of the communication hole 2 and the lateral hole 5 of the extruded pipe 1 is limited to the external diameter. Even if the diameter is smaller than the outer diameter of the pipe, connection becomes possible, and the extrusion pipe 1 can be further thinned.

Further, since the joint pipe 6 is inserted through the communication hole opening 7, the fluid can be connected and injected without preventing the flow path of the fluid operating inside.

The supercritical state of carbon dioxide can be obtained by setting the temperature to about 31 ° C. or more and the pressure to about 7.3 MPa or more. Although carbon dioxide is brought into a supercritical state, it is expected to be applied to a heat pipe in that it does not adversely affect the environment, and carbon dioxide is desirable as a fluid sealed in the heat pipe.

When the heat pipe is filled with carbon dioxide at an initial temperature and an initial pressure so as to be in a supercritical state in a use environment, the heat pipe no longer needs to take in and out of a fluid when used, and is easy to handle. Becomes At the time of use, the internal fluid naturally becomes a supercritical state under the environment, so that the viscosity is extremely low. As a result, the heat pipe can be used as a heat transfer medium that can transfer heat in a path without using a driving unit such as a fan.

(Embodiment 2) (Manufacturing method) From FIG. 1 to FIG.
Is the same as In the present embodiment, some of the lateral hole openings 8
Is formed as a sealing port. Therefore, as shown in FIG.
The lateral hole openings 8 other than those used as the sealing ports are sealed. In this example, the lateral hole opening 8 is sealed by padding and brazing from the outside, but may be sealed by other methods. As shown in FIG. 8, the communication hole opening 7 is not used as a sealing port in this example, so that it is entirely sealed. In FIG. 8, the upper two lateral hole openings 8 that are opened without being sealed in order to form an enclosing port are provided, but only one may be provided.

Thereafter, if necessary, a joint pipe (not shown) having an outer diameter substantially equal to the inner diameter of the horizontal hole 5 is partially projected outward from the horizontal hole opening 8 as in the first embodiment. And a fitting tube (not shown) having an inner diameter substantially equal to the outer diameter of the fitting tube is fitted to a portion of the fitting tube projecting outward from the lateral hole opening, and the fitting tube and the plate-like shape are fitted. The sealing hole may be formed by brazing from the outside to a portion in contact with the body.

(Structure) The heat pipe in the present embodiment is obtained by the above-described manufacturing method. That is, this heat pipe has an initial temperature and an initial pressure such that a supercritical state is established under a temperature and a pressure in a use environment inside an extruded tube 1 as a plate having a plurality of communication holes 2 connected to each other. Is filled with carbon dioxide as a fluid and sealed. In addition, a joint pipe having an outer diameter substantially equal to the inner diameter of the lateral hole 5 is fitted into an opening of a part of the lateral hole 5 to the outside so that a part thereof projects outward, and the joint pipe projects outward. A sealed tube having an inner diameter substantially equal to the outer diameter of the joint tube is fitted to the portion, and a portion where the sealed tube and the plate-like body are in contact is brazed from the outside, and the end of the sealed tube is closed. ing.

(Operation / Effect) According to the above-described structure of the heat pipe and the method of manufacturing the same, since the conventional manifold 3 (see FIG. 21) is not used, there is a possibility of breakage or leakage due to insufficient strength of the connection portion. Can be reduced. as a result,
It is possible to provide a highly reliable heat pipe that does not break even when used under the condition that the fluid enclosed therein is in a supercritical state. In addition, the pipe used for sealing the fluid is an extruded pipe 1
When the connection is made via the joint pipe 6 instead of directly inserted into the pipe, even if the inner diameter of the communication hole 2 or the lateral hole 5 of the extrusion pipe 1 becomes smaller than the outer diameter of the external pipe, the connection And the thickness of the extruded tube 1 can be further reduced.

(Embodiment 3) (Manufacturing Method) A manufacturing method according to the present embodiment will be described with reference to FIGS. As shown in FIG.
At the end of the extruded tube 1, a portion including a part of the communication hole 2 that is to be the sealing port is left as a tubular projection 11, and the other portion is cut off from the end by a fixed length. This excision
It can be performed by wire electric discharge machining or the like. Since the communication hole openings 7 other than the tubular protrusions 11 are not used as sealing holes, they are all sealed by a press or the like as shown in FIG.

As shown in FIG. 11, horizontal holes 5 connecting the communication holes 2 to each other are formed near both ends of the portion excluding the tubular protrusion 11 in the longitudinal direction. As shown in FIG. 12, all the horizontal hole openings 8 are sealed. In this example, the lateral hole opening 8 is sealed by padding and brazing from the outside, but may be sealed by other methods. As shown in FIG. 13, the tubular projection 11 can be connected to an external pipe 12 via a joint pipe 6a. If necessary, the outer periphery of the tubular projection 11 may be cut or plastically deformed, as shown in FIG.
As shown in (1), the cross-sectional shape of the tubular protrusion 11 is processed to be substantially circular. With such processing, as shown in FIG. 15, connection is also made by fitting an external pipe 12 a having an inner diameter substantially equal to the outer diameter of the tubular protrusion 11 so as to cover the outside of the tubular protrusion 11. It becomes possible.

As shown in FIG. 16, carbon dioxide is injected as a fluid from the sealing port, and is pressed and sealed at a sealing portion 14 in the middle of the tubular projection 11. At this time, the carbon dioxide is sealed at an initial temperature and an initial pressure such that the carbon dioxide becomes a supercritical state under the temperature and the pressure in the use environment. FIG.
As shown in FIG. 7, an unnecessary portion of the tubular projecting portion 11 before the sealing portion 14 is cut off.

(Configuration) The heat pipe in the present embodiment is obtained by the above-described manufacturing method. That is, this heat pipe has an initial temperature and an initial pressure such that a supercritical state is established under a temperature and a pressure in a use environment inside an extruded tube 1 as a plate having a plurality of communication holes 2 connected to each other. Is filled with carbon dioxide as a fluid and sealed. Further, at the end of the extruded tube 1, a portion including some of the communication holes 2 is replaced with a tubular projection 11.
The other part is cut away from the end by a fixed length.

(Operation / Effect) According to the above-described structure of the heat pipe and the method of manufacturing the same, since the conventional manifold 3 (see FIG. 21) is not used, there is a possibility of breakage or leakage due to insufficient strength of the connection portion. Can be reduced. Further, since the tubular projection 11 formed integrally with the original extruded tube 1 is used as a sealing port, the connecting portion can be reduced as much as possible, and a structure capable of withstanding a sufficiently high pressure even for a thin and small heat pipe. It can be. as a result,
It is possible to provide a highly reliable heat pipe that does not break even when used under the condition that the fluid enclosed therein is in a supercritical state.

In each of the above-described embodiments, the order of the steps of fitting the joint pipe 6, fitting the sealing pipe 9, sealing the communication hole opening 7 and sealing the horizontal hole opening 8 is as follows. The present invention is not limited to the order described in each embodiment, and the same effect can be obtained by performing it in a different order.

The above embodiment disclosed this time is illustrative in all aspects and is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes any modifications within the scope and meaning equivalent to the terms of the claims.

[0050]

According to the present invention, a part of the lateral hole opening or the communication hole opening is formed as a sealing port, and the other lateral hole opening or the communication hole opening is sealed. It is no longer necessary to use a manifold as described above, and the fluid can be filled directly from the filling port, so that the risk of breakage or leakage due to insufficient strength of the connection portion can be reduced. Therefore, the heat pipe manufactured in this manner can be used without breaking even under high-pressure conditions under which the fluid enclosed therein becomes a supercritical state. When the internal fluid is in a supercritical state, the viscosity becomes extremely low, so that smooth heat transfer is possible without a driving means such as a fan, and the heat in a limited space such as inside OA equipment. Very useful for transportation.

[Brief description of the drawings]

FIG. 1 shows an extruded tube used in a method of manufacturing a heat pipe according to Embodiments 1 and 2 based on the present invention.
FIG. 9 is a sectional view taken along line II of FIG. 9;

FIG. 2 is a cross-sectional view illustrating a first step of a method of manufacturing a heat pipe according to Embodiments 1 and 2 based on the present invention.

FIG. 3 is a sectional view illustrating a second step of the method of manufacturing the heat pipe according to the first embodiment based on the present invention.

FIG. 4 is a sectional view illustrating a third step of the method of manufacturing a heat pipe according to the first embodiment based on the present invention.

FIG. 5 is a sectional view illustrating a fourth step of the method of manufacturing the heat pipe according to the first embodiment of the present invention.

FIG. 6 is a sectional view illustrating a fifth step of the method of manufacturing a heat pipe according to the first embodiment based on the present invention.

FIG. 7 is a sectional view illustrating a sixth step of the method of manufacturing a heat pipe according to the first embodiment based on the present invention.

FIG. 8 is a sectional view illustrating a second step of the method of manufacturing a heat pipe according to the second embodiment of the present invention.

FIG. 9 is a cross-sectional view illustrating a first step of the method of manufacturing a heat pipe according to the third embodiment based on the present invention.

FIG. 10 is a sectional view illustrating a second step of the method of manufacturing the heat pipe according to the third embodiment based on the present invention.

FIG. 11 is a sectional view illustrating a third step of the method of manufacturing the heat pipe according to the third embodiment based on the present invention.

FIG. 12 is a sectional view illustrating a fourth step of the method of manufacturing a heat pipe according to the third embodiment of the present invention.

FIG. 13 is a cross-sectional view illustrating a method of manufacturing a heat pipe according to the third embodiment of the present invention.
It is sectional drawing showing the example of.

FIG. 14 is a view illustrating a method of manufacturing a heat pipe according to the third embodiment of the present invention.
3A is a side view and FIG. 3B is a cross-sectional view of the first step of the example of FIG.

FIG. 15 is a cross-sectional view illustrating a method of manufacturing a heat pipe according to the third embodiment of the present invention.
It is sectional drawing showing the 2nd process of the example of FIG.

FIG. 16 is a cross-sectional view illustrating a first step after fluid injection in a method of manufacturing a heat pipe according to the third embodiment of the present invention.

FIG. 17 is a cross-sectional view illustrating a second step after fluid injection in the method of manufacturing a heat pipe according to the third embodiment of the present invention.

FIG. 18 is a perspective view showing an example in which a heat pipe is used inside a notebook computer.

FIG. 19 is a perspective view of an extruded tube based on the prior art.

FIG. 20 (a) of a manifold based on the prior art
Is a plan view, (b) is a front view, and (c) is a side view.

FIG. 21 is a front view showing an example using a manifold based on the prior art.

FIG. 22 is an explanatory diagram showing a load acting when a manifold based on a conventional technique is used.

FIG. 23 is an explanatory diagram showing a load acting on a section taken along line XXIII-XXIII in FIG. 21 when a manifold based on a conventional technique is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Extrusion pipe, 2 communication holes, 3 manifolds, 4 bonded parts, 5 side holes, 6, 6a joint tube, 7 communication hole opening, 8 side hole opening, 9 sealing tube, 10 sealing hole, 11
Tubular protrusions, 12, 12a pipes, 13, 14 sealing locations, 30 notebook computers, 31 CPU, 32 fans, 33 heat pipes.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Kunihiko Hori 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Naoki Hiro 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Kenji Nasako 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (13)

[Claims] 1. A step of piercing a horizontal hole connecting the communication holes with each other at both ends of a plate having a plurality of communication holes, and providing a sealing port for introducing a fluid into the plate. A sealing hole forming step, a lateral hole opening step in which the lateral hole directly communicates with the outside world, and a lateral hole sealing step of sealing any other than the one used as the sealing port, and the communication hole is directly connected to the outside world. A communication hole sealing step of sealing any of the communication hole openings other than those used as the sealing port, and a fluid sealing step of injecting a fluid from the sealing port to seal the sealing port. And a method for producing a heat pipe. 2. The method according to claim 2, wherein the sealing port forming step includes: fitting a joint pipe having an outer diameter substantially equal to the inner diameter of the communication hole into a part of the communication hole openings so that a part thereof protrudes outward; Fitting an enclosed tube having an inner diameter substantially equal to the outer diameter of the joint tube to a portion of the joint tube that protrudes outward from the communication hole opening; and a place where the enclosed tube and the plate-shaped body are in contact with each other. The method of manufacturing a heat pipe according to claim 1, further comprising a step of brazing to the outside of the heat pipe. 3. The method for manufacturing a heat pipe according to claim 1, wherein the sealing port forming step includes a horizontal hole sealing port forming step of forming a part of the horizontal hole opening as a sealing port. 4. The lateral hole filling port forming step is a step of fitting a joint pipe having an outer diameter substantially equal to the inner diameter of the lateral hole into a part of the lateral hole openings so that a part thereof projects outward. Fitting an enclosed tube having an inner diameter substantially equal to the outer diameter of the joint tube to a portion of the joint tube protruding outward from the lateral hole opening; 4. The method for manufacturing a heat pipe according to claim 3, comprising a step of externally brazing a contact portion. 5. The enclosing port forming step includes: leaving, at an end portion of the plate-like body, a portion including the communication hole, which is to be an enclosing port, as a tubular protrusion; and leaving other portions from the end. The method for manufacturing a heat pipe according to claim 1, comprising a step of cutting a predetermined length. 6. The method of manufacturing a heat pipe according to claim 5, further comprising a step of rounding the tubular projection to process the cross-sectional shape of the tubular projection into a substantially circular shape. 7. The method of claim 1, wherein said fluid is carbon dioxide.
7. The method for producing a heat pipe according to any one of items 1 to 6. 8. A fluid having an initial temperature and an initial pressure so as to be in a supercritical state under the temperature and pressure in a use environment is sealed inside a plate having a plurality of communication holes connected to each other, and sealed. heat pipe. 9. A joint pipe having an outer diameter substantially equal to the inner diameter of the communication hole is fitted into an opening of a part of the communication hole to the outside so that a part of the joint pipe protrudes outward. An enclosing pipe having an inner diameter substantially equal to the outer diameter of the joint pipe is fitted into the protruding portion, and brazing is performed from the outside at a place where the enclosing pipe and the plate-like body are in contact with each other, and 9. The heat pipe of claim 8, wherein the tip is closed. 10. A joint pipe having an outer diameter substantially equal to the inner diameter of the lateral hole is fitted into an opening of a part of the lateral hole to the outside so that a part of the joint pipe protrudes outward. An enclosing pipe having an inner diameter substantially equal to the outer diameter of the joint pipe is fitted into the protruding portion, and brazing is performed from the outside at a place where the enclosing pipe and the plate-like body are in contact with each other, and 9. The heat pipe of claim 8, wherein the tip is closed. 11. An end portion of the plate-like body, wherein a portion including the communication hole is partially left as a tubular protrusion, and the other portion is cut away from the end by a predetermined length. A heat pipe according to claim 1. 12. The heat pipe according to claim 11, wherein a cross-sectional shape of said tubular protrusion is substantially circular. 13. The heat pipe according to claim 8, wherein the fluid is carbon dioxide.