JP2001251079A - Method for producing heat sink using heat pipe and method for producing heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink, with which the function of a heat pipe is not damaged together, either, although reducing a bending R so as to sufficiently secure the attaching dimension of a fin or component to be located at the terminal part of a container. SOLUTION: Concerning a heat sink 100 using a flat heat pipe 10 in a three- dimensionally twisted and turned structure, a heat receiving part is constituted at one terminal of the heat pipe 20, a radiating fin 30 is bonded to the other terminal by heat, a heat sink 200 and a fan motor 50 are provided while bonding the radiating fin to the other terminal by heat, and the cross-sectional area of the radiating fin 30 can be made almost equal with the blowout port of the fan motor 50 as well. Besides, the air channels of the radiating fin 30 and the fan motor 50 can be partially integrated as well. Further, the three- dimensionally returned height of the heat pipe 10 can be made almost equal with the height of the radiating fin 30 as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink using a heat pipe, and more particularly to a heat sink most suitable for application to a high-performance heat sink which must be formed in a limited volume.

[0002]

2. Description of the Related Art In recent years, the performance of digital electronic communication devices such as personal computers has increased, and high-performance heat sinks have been required. The diameter of a heat pipe used for such heat sinks is about 3 mm. 5 with large heat transport from
Thick ones such as 10 to 10 mm have become necessary.

However, the volume for installing the heat sink is limited, and it is necessary to increase the space around the radiation fins in order to improve the heat radiation efficiency. I have.

[0004] For this purpose, the present applicants have disclosed Japanese Patent Application Laid-Open No. 11-17377.
7, According to JP-A-11-183069, etc., developed a heat pipe that can maintain sufficient performance even if the heat pipe with the large diameter is flattened to a thickness of about 1 mm and the steam passage is reduced,
It has been proposed for use in heat sinks.

[0005]

However, in the above-mentioned prior art, an excellent effect could be expected in the height direction, but there was not enough correspondence when bending in the horizontal direction and performing heat transfer were desired. That is, as shown in FIG. 6, which is a conventional example, when the bending R of the heat pipe container is reduced, the heat transport amount decreases due to buckling of the bent portion or movement of the wick formed inside the container. So
Since the bending R of the container cannot be reduced, there have been inconveniences such as insufficient mounting dimensions of the fin group to be mounted on the heat pipe, and disposition of other components near the bending R portion.

In view of the above problem, the present invention reduces the bending radius R so as to secure sufficient dimensions for mounting fins and components disposed at the end of the container. However, a heat sink that does not impair the function of the heat pipe is also provided. The purpose is to provide.

[0007]

According to the present invention, there is provided a heat sink using a flat heat pipe having a three-dimensionally twisted and folded structure. A heat receiving portion may be formed at one end of the heat pipe, and a radiating fin may be thermally bonded to the other end, or a heat sink and a fan motor having the radiating fin thermally bonded to the other end may be provided. The area may be substantially the same as the outlet of the fan motor. Further, the radiation fin and a part of the fan motor wind tunnel may be integrated. The three-dimensionally folded height of the heat pipe may be substantially the same as the height of the radiation fins.

In the method of manufacturing a heat pipe, a bent portion of the flat heat pipe to be bent is slightly bent with a twist angle so as to bring the hydraulic fluid inside the heat pipe to the bent portion. A method of manufacturing a heat pipe in which the internal working fluid is frozen to fix the internal volume with ice and deformed and formed into a final shape, or a heat pipe in which at least a part of a flat heat pipe is three-dimensionally twisted and folded. In the state where the entire flat heat pipe is heated and the entire working fluid inside the heat pipe is vaporized and the internal pressure is sufficiently increased to an external pressure or more, the flatness of the heat pipe is increased and the final pressure is increased. This is a method for manufacturing a heat pipe that is deformed into a shape.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Focusing on the fact that the degree of freedom in bending in the thickness direction is improved in proportion to the flattening ratio of a flat heat pipe, the flat heat pipe has a three-dimensionally torsionally folded structure. Thus, a small heat sink having a high degree of freedom can be configured.

By the way, when viewed from the top in a three-dimensionally torsion-folded manner, it is possible to bend at an arbitrary angle without a bend R, and the height in a front view varies according to the thickness of the flat heat pipe. Heat pipes can be up to several mm.

A specific configuration of the heat sink is a heat sink in which a heat receiving portion is formed at one end of a flat heat pipe having a three-dimensionally twisted and folded structure, and a radiation fin is thermally joined to the other end.

Further, in another configuration, a heat sink and a fan motor having a heat receiving portion at one end of a flat heat pipe having a three-dimensionally twisted and folded structure and a heat radiating fin at the other end are provided. The heat sink has a fin having substantially the same cross-sectional area as the outlet of the fan motor.

[0013] A heat sink and a fan motor having a heat receiving portion formed at one end of a flat heat pipe having a three-dimensionally twisted and folded structure and a heat radiating fin at the other end are provided. By forming a part of the heat sink, the heat radiation efficiency can be increased.

It is to be noted that a more compact heat sink can be formed by making the above-mentioned three-dimensionally folded height of the heat pipe substantially the same as the height of the radiation fins.

[0015]

1 (a) and 1 (b) show an embodiment of a heat sink using a heat pipe according to a first embodiment of the present invention. FIG. 1 (a) is a perspective view and FIG. ) Is a side view. In FIG. 1, the heat pipe 10 is flat and substantially three-dimensionally twisted and folded in an L-shape.
A heat receiving plate 20 is heat-bonded to one end of the heat sink, and a radiating fin group 30 is heat-bonded to the multi-ends to form a basic heat sink 100. The heat sink 100 is provided on a metal plate 40 made of aluminum or the like having good heat conductivity.
One end of the heat pipe 10 to which the heat receiving plate 20 is joined is thermally joined so as to be surface joined, and one surface of the multi-end radiating fin group 30 is also thermally joined to the metal plate 40. Further, a flat directional fan motor 50 having a perforated cover 53 at the top so as to be located at a corner portion of the L-shaped heat sink 100 is attached with the outlet facing the radiating fin group 30, The heat sink 200 has a cooling module structure.

FIG. 2 shows a configuration diagram of the heat sink 100, which is configured as follows. That is, as described above, the heat pipe 10 is a flat heat pipe 10 which is folded back in a substantially L-shape in three dimensions, and the heat receiving plate 20 is disposed at one end of the heat pipe 10. The heat receiving plate 20 is formed by a die casting or extrusion method, and forms a groove 21 at a connection portion with one end of the heat pipe 10, and the heat pipe 1 is formed by the groove 21.
It is fitted to one end of zero. In addition, the heat pipe 1
At the multi-end of 0, a thin plate having good heat conduction such as aluminum having a thickness of about 0.3 mm is formed into a U-shape, and at the same time, a hole 31 corresponding to the cross section of the flat heat pipe 10 and at least the hole 31 are formed. A plurality of heat-dissipating fins 33 having folded portions 32 on the long sides are press-fitted and inserted into the L-shaped heat sink 1.
00. Therefore, the fin group 30 has its U-shaped bottom thermally bonded to the metal plate 40, and one of the openings faces the outlet 51 of the fan motor 50.

The operation of the heat sink 200 is as follows. The heat of the heat receiving plate 20 in contact with the heat source is evenly distributed by the flat heat pipe 10, the metal plate 40 and the radiating fin group 30. By taking in the cooling air from the suction port 52 and exhausting the air from the blowing port 51, the heat exchange part having a small ventilation resistance, which is composed of the thin heat pipe 10 and the radiating fin group 30, is efficiently cooled, and the heat receiving plate 20 is cooled. To prevent temperature rise.

FIG. 3 shows a second embodiment of the present invention.
Although the overall configuration is the same as that of the first embodiment shown in FIG. 1, the perforated cover 53 constituting the suction port 52 of the fan motor 50 shown in FIG. The cover 54 is replaced by a cover 54 having a length to be wrapped, and a part of the wind tunnel is formed to prevent air leakage from the outlet 51 and to increase a heat radiation contributing area.

Here, a method of manufacturing the flat heat pipe 10 having a three-dimensionally twisted and folded structure will be described. Inside a tubular container such as copper or aluminum with a diameter of about 6 mm,
After configuring the groove groove to be a wick, fixing braided wire, mesh or fiber bundle, etc.,
The inside of the container is depressurized and a predetermined amount of a working fluid such as water or CFC substitute is injected, and both ends of the container are sealed to complete a general round heat pipe. Next, the round heat pipe is formed into a thickness of 1 to 2 mm to form a straight flat heat pipe.

When the flat heat pipe is bent with the thickness fixed, the bent portion 11 is slightly bent at the same torsion angle to bring the hydraulic fluid inside the heat pipe 10 to the bent portion. Is frozen, the inner volume is fixed with ice, and the final shape is deformed.

Further, when the thickness of the flat heat pipe may be changed, the entire working fluid is vaporized by heating the entire flat heat pipe, so that the internal pressure is sufficiently increased to the external pressure or more. Thus, a material having a thickness of 2 mm can be flattened to 1.5 mm or more, and can be deformed and formed into a final shape.

The angle θ in the plan view of FIG. 4A showing the flat heat pipe 10 having a three-dimensional torsion structure obtained by these methods can be set arbitrarily, but the torsion height in the side view of FIG. The minimum value of h is proportional to the final thickness of the flat heat pipe 10, but can be reduced to several mm by the above-mentioned frozen method.

FIG. 5 shows a third embodiment of the present invention.
FIG. 5A is a perspective view, and FIG. 5B is a side view.
The difference from this embodiment is that the three-dimensionally twisted folded portion 11
In two places. The folded heights h at the two locations in this embodiment need not necessarily be the same, and are selected as needed.

In the first and second embodiments, the metal plate 4
0 or the fan motor 50 is used, but the mounting surface direction is not limited, and is not always necessary depending on the size of the radiating fin group 30, and when the metal plate 40 is used, the heat receiving plate 20 is not necessarily required. Not necessary.

Further, as the radiating fin group 30, various general-purpose fins such as ordinary aluminum extrusion fins, die-cast fins and corrugated fins are used, and when the fan motor 50 is used, no special fins are used. The entire fan motor housing is made of metal such as die-cast, and the heat pipe 10 is thermally bonded to the housing, so that the radiation fins can be substituted.

[0026]

As described in detail above, according to the present invention, there is no buckling of the heat pipe in the container or the movement of the wick formed inside the container, and the bending angle of the heat resistance value is hardly deteriorated. Since a flexible heat pipe can be obtained, it is possible to provide a heat sink in which the mounting dimensions of the fin group to be mounted on the heat pipe can be freely set and the degree of freedom in arranging peripheral components is greatly improved.

[Brief description of the drawings]

FIG. 1 shows a configuration diagram of a heat sink according to a first embodiment of the present invention.

FIG. 2 shows a configuration diagram in which a heat pipe portion of FIG. 1 is developed.

FIG. 3 shows a side view of a heat sink according to a second embodiment of the present invention.

FIG. 4 shows a flat heat pipe having a three-dimensional torsion folded structure.

FIG. 5 shows a heat pipe according to a third embodiment of the present invention.

FIG. 6 shows a configuration diagram in which a conventional heat pipe is bent.

[Explanation of symbols]

 In the drawings, the same reference numerals indicate the same or corresponding parts. REFERENCE SIGNS LIST 10 heat pipe 11 bent portion 20 heat receiving plate 21 groove 30 radiating fin group 31 hole 32 folded portion 33 radiating fin 40 metal plate 50 fan motor 51 outlet 52 suction port 53 perforated cover 54 cover 100 heat sink 200 heat sink

Claims (7)

[Claims] 1. A heat sink using a flat heat pipe having a three-dimensionally twisted and folded structure. 2. A heat sink using a heat pipe in which a heat receiving portion is formed at one end of a flat heat pipe having a three-dimensionally twisted and folded structure, and heat radiation fins are thermally bonded to the other end. 3. A flat heat pipe having a three-dimensionally twisted and folded structure having a heat receiving portion at one end and a heat sink and a fan motor having heat radiating fins thermally bonded at the other end. A heat sink using a heat pipe that is almost the same as the outlet of the fan motor. 4. A flat heat pipe having a three-dimensionally twisted and folded structure having a heat receiving portion at one end and a heat sink and a fan motor having heat radiating fins thermally bonded at the other end, wherein the radiating fin and the fan motor wind tunnel are provided. A heat sink using a heat pipe that integrates a part of it. 5. A heat sink using a heat pipe according to claim 2, wherein a height of the heat pipe three-dimensionally folded is substantially the same as a height of the radiation fin. 6. A bending portion of a flat heat pipe to be bent is slightly bent at an appropriate twist angle to bring the hydraulic fluid inside the heat pipe to the bent portion, and then freeze the hydraulic fluid inside the heat pipe. A method of manufacturing a heat pipe in which the inner volume is fixed with ice and deformed into a final shape. 7. A heat pipe in which at least a part of a flat heat pipe is three-dimensionally twisted and folded, the entire flat heat pipe is heated, and the entire working fluid inside the heat pipe is vaporized to thereby reduce internal pressure. A method of manufacturing a heat pipe, comprising: increasing the flatness of the heat pipe and deforming the heat pipe to a final shape in a state where the pressure is sufficiently increased to be equal to or higher than the external pressure.