KR101349907B1 - Method for manufacturing of heatpipe and radiating module manufactured the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a heat pipe and a heat radiation module using the heat pipe. The method for manufacturing a heat pipe comprises: a preparation step of preparing a main body having a through hole at one end and a hollow space inside thereof in order to prevent the loss of a heat medium during the manufacturing process and improve heat transfer efficiency through reaction of the heat medium in a complete vacuum; a heat medium injection step of injecting a liquid heat medium into the main body through the through hole; a cooling step of cooling the heat medium inside the main body by cooling the main body rapidly; a vacuum step of creating a vacuum in the cooled main body; and a sealing step of sealing the through hole to keep the vacuum in the main body. The heat radiation module includes a heat pipe manufactured by the method and a heat radiation member with heat radiation fins formed along the outer circumference of a body into which the heat pipe is inserted, wherein the heat pipe is inserted into the body to form a hollow space at the inner top portion of the body. [Reference numerals] (AA) Preparation step; (BB) Heat medium injection step; (CC) Cooling step; (DD) Vacuuming step; (EE) Sealing step

Description

Heat pipe manufacturing method and heat dissipation module using the same {Method for manufacturing of heatpipe and radiating module manufactured the same}

The present invention relates to a heat pipe manufacturing method and a heat dissipation module using the same, and in particular, a heat pipe manufacturing method of improving heat transfer efficiency by cooling a heat medium injected into a heat pipe and making the heat pipe in a vacuum state, and in the manufacturing method. It relates to a heat dissipation module using a heat pipe.

In general, LED (Light Emitting Diode) is a type of semiconductor. When a voltage is applied, electric energy is changed into light energy to emit light. The light using such LED is low in electricity consumption, It is possible to implement color easily, and it is getting a lot of attention recently as an eco-friendly technology.

However, since the illumination using the LED generates considerable heat, it is necessary to dissipate the generated heat quickly and efficiently. Various heat dissipation technologies are being developed because the heat dissipation performance in LED lighting is directly related to the lifetime.

Such heat dissipation technology has LED illumination using a metal base substrate, but it is difficult to sufficiently secure heat dissipation, and LED lighting using an aluminum nitride (AIN) plate having a high thermal conductivity has a problem of high manufacturing cost.

Accordingly, in order to solve such a problem, the LED lighting using the heat pipe shown in Fig. 1 has been proposed in Japanese Patent Application Laid-Open No. 10-2008-0071812 (hereinafter referred to as "cited invention"). The above cited invention has the advantage that it is possible to cool the heat generated at a low manufacturing cost compared to the prior art by providing a cooling device using a heat pipe in the LED lighting.

In the manufacture of the heat pipe presented in the cited invention, a working fluid for heat transfer is injected into the heat pipe. The auxiliary space 54 of the sealing cap 52 is used to make the interior space 100 in a vacuum at a predetermined level. The working fluid is injected into the inner space, and the end of the auxiliary pipe 54 is sealed by welding.

In order to efficiently perform heat transfer through the working fluid, the internal space 100 must be completely vacuumed, but in the case of manufacturing according to the above-mentioned invention, some air enters in the process of injecting the working fluid, thereby improving heat transfer efficiency. There is a problem of falling.

In addition, as described above, when a working fluid made of a liquid is first injected into the internal space 100 and then a vacuum is formed, a part of the working fluid is released from the internal space 100 during the process of making the vacuum state. Is generated.

The present invention is to solve the above problems, by cooling the heat medium injected into the heat pipe and making the heat pipe in a vacuum state, there is no loss of the heat medium during the manufacturing process, the heat medium reacts in the complete vacuum state heat transfer An object of the present invention is to provide a heat pipe manufacturing method having improved efficiency and a heat dissipation module using the heat pipe according to the manufacturing method.

The heat pipe manufacturing method of the present invention for achieving the above object is a preliminary step of forming a through-hole at one end and a hollow cylindrical body; and, injecting a heat medium made of liquid into the inside of the main body through the through-hole. Heating medium injecting step; A cooling step of freezing the heat medium by rapidly cooling the body in which the heat medium is injected; Vacuuming the inside of the cooled body into a vacuum state; And a sealing step of sealing the through-holes so that the inside of the main body maintains a vacuum state.

In addition, the heat dissipation module using a heat pipe of the present invention for achieving the above object is a heat pipe formed by the above manufacturing method; And a heat dissipation member having a heat dissipation fin formed along an outer circumferential surface of the pipe-shaped body into which the heart pipe is fitted, wherein the heat pipe is fitted to the body such that an empty space is formed at an inner upper end of the body.

In the heat pipe manufacturing method according to the present invention, after injecting a liquid heat medium into a heat pipe body, the heat medium is frozen, and then a part of the heat medium is released during the vacuum process by making the inside of the heat pipe body into a vacuum state. The heat transfer efficiency can be prevented from falling, and since the heat medium injection step precedes the vacuum step, it is not necessary to consider that some air enters during the heat medium injection, thereby improving heat generation efficiency by improving heat transfer.

In addition, the heat dissipation module is configured using a heat pipe having improved heat transfer efficiency by the manufacturing method, and the heat pipe is inserted into the upper end of the inner side of the body of the heat dissipation member so that a convection for heat dissipation can be achieved. Thereby, the heat transferred from the heat pipe can be more efficiently exported to the outside.

1 is a cross-sectional view showing a structure of a conventional heat pipe,
2 is a process diagram of a heat pipe manufacturing method according to the present invention;
Figure 3 is a perspective view showing the structure of the heat pipe produced by the heat pipe manufacturing method of the present invention,
Figure 4 is a cross-sectional view showing the structure of the heat pipe produced by the heat pipe manufacturing method of the present invention,
5 is an exploded perspective view showing a structure of a heat pipe manufactured by the heat pipe manufacturing method of the present invention;
Figure 6 is a state diagram showing the heat medium injection step of the heat pipe manufacturing method according to the present invention,
7 is a state diagram showing a cooling step of the heat pipe manufacturing method according to the present invention,
8 is a state diagram showing a vacuum step and a sealing step of the heat pipe manufacturing method according to the present invention,
9 is a perspective view showing a structure of a heat radiation member applied to a heat radiation module using a heat pipe according to the present invention;
10 is a perspective view illustrating a disassembled and coupled state of a heat dissipation module using a heat pipe according to the present invention;
11 is a state diagram showing a process of manufacturing a heat dissipation module using a heat pipe according to the present invention;
12 is a cross-sectional view showing a state in which a heat dissipation module using a heat pipe according to the present invention is coupled to a substrate.

In the present invention, there is no loss of the heat medium during the manufacturing process, in order to improve the heat transfer efficiency by the heat medium is reacted in a complete vacuum state, the preparation step of forming a through-hole at one end and the hollow body having a hollow inside; and, the through hole A heat medium injection step of injecting a heat medium made of a liquid into the inside of the main body; A cooling step of freezing the heat medium by rapidly cooling the body in which the heat medium is injected; Vacuuming the inside of the cooled body into a vacuum state; It proposes a heat pipe manufacturing method comprising a; sealing step of sealing the through-holes so that the inside of the main body maintains a vacuum state.

In addition, the heat pipe formed by the above production method; And a heat dissipation member having a heat dissipation fin formed along an outer circumferential surface of the body in which the heart pipe is fitted, wherein the heat pipe is fitted to the body such that an empty space is formed at an inner upper end of the body. We propose a heat dissipation module.

The scope of the present invention is not limited to the embodiments described below, and various modifications may be made by those skilled in the art without departing from the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, FIGS.

Figure 2 is a process diagram of a heat pipe manufacturing method according to the present invention, the heat pipe manufacturing method of the present invention comprises a preparation step, heating medium injection step, cooling step, vacuum step, sealing step. Therefore, the following describes a method for manufacturing a heat pipe according to the sequential steps shown in FIG.

(a) preparation step

In order to manufacture the heat pipe 100 according to the present invention is a step having a hollow body 110 of the inside. The main body 110 is preferably formed of a material having a high thermal conductivity. In general, copper (Cu) is generally used, but the present invention is not limited thereto.

For example, copper has a thermal conductivity of 300 to 340 ㎉ / ºC, aluminum (Al) has a thermal conductivity of about 175 ㎉ / ºC, and copper is twice as effective as aluminum. On the other hand, aluminum is lighter than copper, has a lower recycling cost, and is less likely to generate environmentally harmful substances at the time of production, and is currently used in automobiles and industrial applications.

On the other hand, the main body 110 may be formed in a variety of forms, it will be described on the premise that the tubular as shown in FIG. In addition, the main body 110 may be formed by combining the respective materials forming the side surface, the upper surface and the lower surface by welding or the like, but is preferably formed by drawing a single plate-like material. .

In addition, the inside of the main body 110 is empty as shown in FIG. 4 to inject a heat medium A that absorbs heat generated from a device such as a machine and moves heat from a high temperature portion to a low temperature portion. In addition, a through hole 111 is formed at one end of the main body 110, and the through hole 111 serves as an inlet for injecting the heat medium A and at the same time serves as a flow path of air later. do.

The heat pipe 100 provided in the preparation step may have a screw (일단) formed on one end of the main body 110, as shown in FIG. The screw is formed to easily fix the heat pipe 100 to the machine and the like at the same time to prevent the heat transfer efficiency when the adhesive is applied to the heat pipe 100 to be fixed to the machine and the like at a later time.

In addition, the preparation step may be provided with a stopper 120 that can be coupled to the through-hole 111 as shown in FIGS. 4 and 5. The through hole 111 may be sealed by welding in the sealing step, but the main body 110 may be deformed during the welding process, and the safety of the worker may not be guaranteed due to the flame. Accordingly, the stopper 120 may be coupled to the through hole 111, and a thread may be formed in the through hole 111 and the stopper 120 to facilitate coupling.

On the other hand, the inner surface of the main body 110 may be formed of a wick (Wick) for more effective heat transfer by the heat medium (A), the heat medium (A) is a gas to receive the heat is to come down to the liquid Will follow the week.

(b) Heating medium injection stage

After the main body 110 is provided through the through hole 111 to absorb the heat generated from the device such as a machine inside the main body 110 to inject the heat medium (A) for moving the heat from the high temperature portion to the low temperature portion do. The heating medium (A) is preferably a liquid substance having a low boiling point, but is not limited thereto. A gas or a solid may be used.

When the liquid material is used as the heat medium (A), methyl alcohol (Methlyl alcohol) is mainly used, but not limited thereto. Various kinds of materials may be used as long as the liquid has a low boiling point. Hereinafter, the present invention will be described on the premise that the heat medium (A) is a liquid substance.

Later, when the heat pipe 100 and the heat dissipation member 200 manufactured by the present invention are combined to form a heat dissipation module, and then installed on the substrate 10, the lower end of the heat pipe 100 coupled to the substrate 10 is formed. It heats, and this heats the heat medium A which becomes liquid. The heated heat medium (A) is in a gaseous state and rises to an upper end of the heat pipe (100) to transfer heat to the heat radiating member (200), and the heat medium (A) which transfers heat to the heat radiating member (200). Becomes liquid again and comes down to the lower end of the heat pipe 100.

Therefore, a liquid having a low boiling point such as methyl alcohol is mainly used, and it is preferable to select an appropriate heat medium (A) in consideration of the characteristics of the device in which the heat pipe 100 is installed and the calorific value of the peripheral device.

The heat medium A made of the liquid is injected through the through hole 111 after the main body 110 is erected using an injector as shown in FIG. 6. At this time, the heat medium (A) is preferably injected to occupy 15 to 30% of the internal volume of the main body (110). The heat medium (A) is subjected to heat as described above changes to the gas state to the upper end of the inside of the heat pipe (A) and then to the liquid state again to return to the lower end of the inside of the heat pipe (A) bar In the case of injection outside the above range, the heat dissipation performance is hindered.

On the other hand, after injecting the heat medium (A) is coupled to the stopper 120 in order to prevent the foreign matter flows through the through hole 111 or the heat medium (A) is a liquid outflow, wherein the The stopper 120 is to be coupled only a portion. The reason why the stopper 120 is only partially coupled is described below in the vacuum step.

(c) cooling stage

As the heat medium A is injected and the stopper 120 is partially coupled, the main body 110 is cooled using a cooler as shown in FIG. 7. The heat medium A injected into the main body 110 by the rapid cooling of the main body 110 is in a frozen state.

In the heat pipe manufacturing method according to the present invention, the vacuum step is performed after the cooling step. When the heating step (A) made of liquid is injected into the main body 110 without undergoing the cooling step, the vacuum step is performed immediately. A part of the heat medium (A) with the air in the main body 110 is out of the main body 110 occurs. On the other hand, when the vacuum step is performed in advance of the heat medium injection step, a problem that some air is introduced into the body 110 when the heat medium (A) is injected.

Therefore, the heat pipe manufacturing method according to the present invention is passed through the step of cooling the heat medium (A) so that the heat medium (A) does not leak with the internal air of the body 110 during the vacuum step in order to solve this problem. .

The temperature cooled by the cooler is adjusted in consideration of the freezing point of the heat medium (A), the cooling time is preferably about 10 to 30 minutes. As an example, when the heat medium (A) is methyl alcohol, the freezing point is -97.8 ° C., thereby cooling to a temperature below that.

In the cooling step, the main body 110 is preferably cooled in a state lying down in the cooler as shown in FIG. When the main body 110 is laid down on the cooler, the area of the heating medium A, which is made of the liquid injected into the inside thereof, is in contact with the cooler. Therefore, it is possible to cool the main body 110 in a shorter time than the case where the heat pipe 100 is kept in a standing state.

On the other hand, in the cooling step by maintaining a state in which the stopper 120 is only partly coupled to the main body 110, it is possible to block foreign matter that can be introduced in the cooling step.

(d) vacuum stage

In order to make the interior of the cooled main body 110 in a vacuum state, a vacuum chamber is used as shown in FIG. 8, which is described below on the premise of the present invention, but is not limited thereto.

~

Torr이다. As shown in FIG. 8, since the air inside the main body 110 is also leaked in the process of fixing the heat pipe 100 to suck air in the vacuum chamber to create a vacuum state, the heat pipe 100 is in a vacuum state. Where the vacuum range is

~

Torr.

Even in the vacuum step, the stopper 120 has only a part coupled to the main body 110, and thus a fine gap is formed between the through hole 110 and the stopper 120. As described above, the stopper 120 is disposed within the main body 110. Since the heat medium A is in a frozen state, only air in the main body 110 can be discharged.

(e) closure stage

The inside of the heat pipe 100 is maintained in a vacuum state by completely sealing the main body 110 in which the inside is in a vacuum state, and for this purpose, the through hole 111 is completely sealed.

In order to prevent the outside air from flowing back into the main body 110 during the sealing step, it is made in the vacuum chamber. As shown in FIG. 8, the vacuum chamber includes a device capable of fully coupling the stopper 120 to the main body 110. When the inside of the main body 110 is completely vacuumed through the vacuum step, The stopper 120 is coupled so that the main body 110 is pushed.

As a result, the heat pipe 100 manufactured according to the present invention does not generate a loss of the heat medium A during the manufacturing process, and the inside of the main body 110 maintains a complete vacuum state, thereby improving heat transfer efficiency.

As described above, the heat pipe 100 manufactured through the preparation step, the heat medium injection step, the cooling step, the vacuum step, and the sealing step may be used in various fields, but in the present invention, the heat transferred from the heat pipe 100 is externally provided. It will be described that the heat dissipation member 200 is emitted to be used as a heat dissipation module.

The heat dissipation member 200 includes a pipe-shaped body 210 into which the heat pipe 100 is fitted as shown in FIG. 9, and a heat dissipation fin 220 formed along an outer circumferential surface of the body 210. In addition, the body 210 and the heat dissipation fins 220 may be integrally formed, and then may be separately manufactured and then coupled to each other.

On the other hand, the heat dissipation fin 220 is formed in the vertical direction to the body 210, a number of dogs are provided and disposed radially. In addition, as shown in FIG. 9, the cross-sectional shape of the plurality of heat dissipation fins 220 may be circular, but is not limited thereto. That is, the space efficiency of the heat dissipation module 200 may be maximized by forming a triangle, a square, a pentagon, or the like.

The heat pipe 100 is fitted to the body 210 as shown in Figure 10a, at this time is fitted using a press or the like as shown in FIG. The heat pipe 100 is coupled to the body 210 as shown in FIG. 10B.

The heat dissipation module according to the present invention dissipates the heat received from the heat pipe 100 to the outside while the convection current is generated due to the temperature difference around the heat dissipation fin 220. [ As the convection occurs smoothly, heat dissipation efficiency is improved. For this purpose, the heat pipe 100 is fitted to form an empty space at an inner upper end of the body 210 as shown in FIGS. 10B and 12, and the bin The height of the space is preferably 10 to 20% of the length of the body (210).

 In addition, the length of the heat pipe 100 is preferably shorter than the length of the body 210 to form the empty space. If the length of the heat pipe 100 is formed to be the same as the length of the body 210 and then inserted so that an empty space is formed in the inner upper end of the body 210, the lower end of the heat pipe 100 is the body It is projected downward from the lower end of 210.

In this case, the heat dissipation fin 220 is spaced apart from the substrate 10 of the apparatus such as a machine, so that convection occurs smoothly, but the lower end corresponding to 10 to 20% of the length of the heat pipe 100 is connected to the heat dissipation fin 220. The bar is not in contact, and the heat transfer efficiency to the heat dissipation fin 220 is reduced.

Therefore, the heat pipe 100 has a length shorter than the length of the body 210 is fitted to the body 210 to form an empty space at the inner upper end of the body 210 and at the same time the body 210 Since the portion protruding downward from the bottom of the c) is small, convection occurs smoothly and the heat dissipation efficiency is improved.

In this case, the downwardly protruding portion means that the portion protruding from the substrate 10 is less than 10% of the length of the heat pipe 100, and may be changed according to the characteristics of the apparatus such as a machine in which the heat dissipation module of the present invention is installed. Of course it can.

The heat pipe 100 inserted into the heat dissipation member 200 is coupled to the substrate 10 of the apparatus such as a machine, and a screw formed to be coupled to the substrate 10 protrudes from the bottom surface of the heat pipe 100. Is formed. At this time, it is natural that the grooves to which the screws are coupled to the substrate 10 are formed.

As described above, the lower end of the heat pipe 100 is preferably fitted to protrude downward from the lower end of the body 210 so that convection for heat dissipation is smoothly performed. A screw is formed in the heat pipe 100 12, the heat dissipation fin 220 is separated from the substrate 10 as shown in FIG. 12. In the installation of the heat dissipation module 200 according to the present invention, the substrate 10 and the heat dissipation fin ( It is possible to prevent the friction with 220).

Therefore, a screw that can be coupled to the substrate 10 is formed in the heat pipe 100, and the lower end of the heat pipe 100 is fitted to protrude downward from the body 210, so that convection occurs smoothly and heat dissipation efficiency is increased. As well as the improvement, the damage of the heat dissipation fin 220 or the substrate 10 is prevented in the installation process of the heat dissipation module 200 and at the same time, the heat dissipation module 200 is easily installed.

On the other hand, although not shown in the figure, the body 210 may be formed larger than the diameter of the upper diameter. Even in this case, the heat pipe 100 is fitted to the body 210, and the outer side of the fitted heat pipe 100 is in contact with the inner side of the body 210 to transmit heat.

Since the diameter of the lower portion of the body 210 is smaller than the diameter of the upper portion, as shown in FIG. 11, it is preferable to press the heat pipe 100 by using a compressor system such as a press. The inserted heat pipe 100 is in close contact with the inner side of the body 210 to efficiently heat transfer to the heat dissipation fin 220, even if the heat dissipation module 200 is used for a long time the body 210 ) And the minute gap is not generated between the heat pipe 100 and the heat dissipation efficiency can be prevented from being lowered.

As described above, the heat pipe manufacturing method of the present invention injects a heat medium A made of a liquid into the body 110 of the heat pipe 100, and then freezes the heat medium A, and then By making the interior into a vacuum state, it is possible to prevent a part of the heat medium (A) from falling out in the process of vacuum and to lower the heat transfer efficiency, and the heat medium injection step is preceded by the vacuum step, so that a part of the heat medium (A) injection There is no need to consider the air entering, the heat transfer effectively occurs, it is possible to improve the exothermic performance.

In addition, the heat dissipation module 200 is configured by using the heat pipe 100 having improved heat transfer efficiency by the manufacturing method, wherein the heat pipe 100 is empty at the upper end of the body 210 of the heat dissipation member 200. Since the space is fitted to form a smooth convection for the heat dissipation can be made it is possible to more efficiently export the heat transferred from the heat pipe 100 to the outside.

A: heating medium 10: substrate
100: heat pipe 110: body
111: through hole 120: stopper
200: heat dissipating member 210: body
220: heat sink fin

Claims (10)

The through-hole 111 is formed at one end and the preparation step of having a hollow body 110 of the inside; and,
A heat medium injection step of injecting a heat medium A made of liquid into the body 110 through the through hole 111;
A cooling step of freezing the heat medium (A) by rapidly cooling the main body (110) into which the heat medium (A) is injected;
A vacuum step of making the inside of the cooled main body 110 in a vacuum state;
And a sealing step of sealing the through hole (111) so that the inside of the main body (110) maintains a vacuum state. The method of claim 1,
The stopper 120 is coupled to the through hole 111 after the heating medium injection step,
The stopper 120 is a heat pipe manufacturing method, characterized in that the circulation of the air is made by only a portion of the cooling step and the vacuum step is combined. The method of claim 1,
In the heat medium injection step, the heat medium (A) is a heat pipe manufacturing method, characterized in that the injection to occupy 15 to 30% of the internal volume of the body (110). The method of claim 1,
In the cooling step, the main body 110 is a heat pipe manufacturing method characterized in that the cooling is made in a state lying on the cooler. The method of claim 1,
The vacuum step and the sealing step is a heat pipe manufacturing method, characterized in that made in the vacuum chamber. The method of claim 1,
The main body 110 is a heat pipe manufacturing method, characterized in that formed by drawing the metal plate member. A heat pipe (100) formed by the manufacturing method according to any one of claims 1 to 6;
And a heat dissipation member 200 in which a heat dissipation fin 220 is formed along the outer circumferential surface of the pipe-shaped body 210 into which the heat pipe 100 is fitted.
The heat pipe 100 is a heat dissipation module using a heat pipe, characterized in that fitted to the body 210 so that an empty space is formed in the inner upper end of the body (210). The method of claim 7, wherein
Screws protrude from the bottom surface of the heat pipe 100 to be coupled to the substrate 10,
Heat dissipation module using a heat pipe, characterized in that the lower end of the heat pipe 100 is fitted so as to project downward from the lower end of the body (210). The method of claim 7, wherein
The body 210 is a heat dissipation module using a heat pipe, characterized in that the diameter of the upper portion is formed larger than the diameter of the lower portion, the heat pipe 100 is sandwiched. The method of claim 7, wherein
The length of the heat pipe 100 is a heat dissipation module using a heat pipe, characterized in that formed shorter than the length of the body (210).

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