WO2016204328A1

WO2016204328A1 - Thin heat pipe and method for manufacturing same

Info

Publication number: WO2016204328A1
Application number: PCT/KR2015/006256
Authority: WO
Inventors: 차준선; 김병호; 최유진
Original assignee: 티티엠주식회사
Priority date: 2015-06-19
Filing date: 2015-06-19
Publication date: 2016-12-22
Also published as: CN107835926A

Abstract

The present invention relates to a thin heat pipe and a method for manufacturing same. The thin heat pipe of the present invention comprises a thin housing (3) having a hollow space (S) therein and formed through a first formation step for forming a hollow tube and a second formation step for forming the thin housing by compressing the hollow tube. The housing (3) is filled with a working fluid (F) which transfers heat. The present invention may provide an ultra-thin heat pipe which cannot be expected to be obtained from drawing or extruding.

Description

Thin Heat Pipe and Manufacturing Method Therefor

The present invention relates to a thin heat pipe and a manufacturing method therefor, and more particularly to a thin heat pipe of a thin thickness that can not be produced by extrusion or drawing and a manufacturing method for the same.

In particular, the present invention relates to a method for manufacturing a thin heat pipe, a heat pipe, and a method for manufacturing a housing for a thin heat pipe, which can be suppressed to generate corrugations on the surface as much as a thin film.

In general, heat pipes are tens to hundreds of times more thermally conductive than high thermally conductive metals such as silver, copper, and aluminum. Therefore, the heat pipe has a very wide range of application, which is useful in various fields such as cooling a heat generating unit at a specific position like a computer CPU, recovering heat from exhaust gas, and collecting geothermal or solar heat. It is a heat transportation device.

In addition, the heat pipe is made of an airtight solid such as metal such as stainless steel, copper, and aluminum, and forms a closed space, that is, a housing, in the form of a tube to contain a working fluid therein. Therefore, when heat is applied from one side of the housing, the working fluid is evaporated in the inner space of the heating part, and the vaporized vapor is rapidly moved to the other side where no heat is applied and condensed, so that the heat of the heating part (evaporation part) is latent. It serves to be delivered to the condensation unit in the form of heat). At this time, the condensed liquid is returned to the heating part again by the capillary force of the wick structure provided inside the housing. Then, the heat transfer cycle as described above is infinitely repeated, so that the heat of the heating unit is continuously moved to the condensing unit.

However, such heat pipes have recently been required to be compact and thin in accordance with the trend of miniaturization or thinning of various electronic products such as computers and laptops.

However, in the case of plate heat pipes which are generally widely produced, drawing or extrusion processing applied when manufacturing a plate-shaped housing is subject to certain dimension limitations in housing thinning due to limitations in processing accuracy. That is, when a thin plate heat pipe is to be manufactured by drawing or extruding, the housing formed by drawing or extruding may not be able to produce capillary force due to the limitation of processing precision of drawing or extruding. There was a problem that it is not crushed or distorted can not be normally applied to heat pipe manufacturing.

In addition, as shown in the upper side of FIG. 1, there has been an attempt to roll the heat pipe 101 into a thin shape after fabricating within a range that maintains processing accuracy by drawing or extrusion, but in this case, the lower side of FIG. As shown in FIG. 3, due to the yield strength of the partition wall 115, compression deviation occurs in the flat plate 111 at the portion where the partition wall 115 is located and at the portion where the partition wall 115 is not located. Since the 111 is generally corrugated, the heat pipe 101 manufactured by the housing 103 has a problem in that the heat resistance of the contact portion with the heat source is increased when the product is applied, thereby significantly reducing the heat generation performance.

In addition, since the wick 105 formed to face each other on the upper and lower flat plates 111 is arranged side by side up and down, the upper protrusion 121 and the lower protrusion 121 when rolling as shown in the lower side of FIG. Is close, while the upper groove 123 and the lower groove 123 are spaced apart. Therefore, on the premise that the cross-sectional area of the housing 103 is constant, since the gap between the upper groove 123 and the lower groove 123 is sufficiently wide, the boiling working fluid during degassing may be lost in the form of a liquid lump. Since the loss amount of the working fluid can be large, there is a problem that the production efficiency of the heat pipe is lowered. In addition, as shown in the lower side of FIG. 1, the longitudinal cross-sectional area of the housing 103 is reduced due to deformation due to buckling, resulting in a decrease in the performance of the heat pipe 101, and the upper protrusion 121 and the lower protrusion 121. Since the spacing between them is sufficiently narrow, the resistance to the flow of the working fluid is increased, and there is also a problem that the heat radiation performance of the heat pipe is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to process a thin heat pipe of thin thickness, which could not be formed by drawing or extrusion due to the limitation of processing precision, and thus, by pressing, It is an object of the present invention to provide a thin heat pipe and a manufacturing method therefor that have a sufficiently thin thickness and do not degrade heat dissipation performance or production efficiency in response to the trend of thinning.

The thin heat pipe manufacturing method of the present invention for achieving the above object, the housing manufacturing step of manufacturing a thin hollow housing; A working fluid injection step of injecting a working fluid operating in the housing into the housing; And a closing step of sealing and sealing the inlet of the housing into which the working fluid is injected, wherein the housing manufacturing step includes forming a flat hollow tube with a thickness capable of plastic processing by drawing or extrusion. Molding step; And a secondary molding step of molding the housing having a thin shape by compressing the hollow tube so that the thickness of the hollow tube is reduced.

In addition, the manufacturing method of the thin heat pipe housing of the present invention, the primary forming step of forming a flat hollow tube to a thickness capable of plastic processing by drawing or extrusion; And a secondary molding step of molding the housing having a thin shape by compressing the hollow tube so that the thickness of the hollow tube is reduced.

In addition, the thin heat pipe of the present invention comprises a thin hollow housing having a hollow provided therein as manufactured by the first forming step and the second forming step; A working fluid which is filled in the hollow of the housing and is evaporated at one side of the housing by heat transferred to the housing to condense at the other side of the housing; And a wick which protrudes on both sides of the inner surface of the housing to face each other and guides the working fluid in both directions through the groove formed between the spaced gaps of the protrusions. .

Unlike the above, the manufacturing method of the thin heat pipe housing of the present invention, the primary forming step of forming a flat hollow tube to a thickness capable of plastic processing by drawing or extrusion; And a secondary molding step of molding the housing having a thin shape by compressing the hollow tube so that the thickness of the hollow tube is reduced.

Here, the primary forming step, by connecting the pair of flat plate and the plate facing each other to provide a hollow inside the plate, the hollow against the pressing force generated by the pressing of the secondary forming step Forming the hollow tube by drawing or extruding the hollow tube formed by a pair of sidewalls having an inclination with respect to the flat plate such that the yield strength of the tube is attenuated so that the flat plate is generally flat even after pressing; In the secondary forming step, the hollow tube is compressed by rolling to reduce the thickness of the hollow tube to a thin thickness.

In addition, the thin heat pipe of the present invention, according to the manufacturing as described above, consisting of the flat body and the side wall body having an inclination, a thin hollow housing having a hollow therein; A working fluid which is filled in the hollow of the housing and is evaporated at one side of the housing by heat transferred to the housing to condense at the other side of the housing; And a wick configured to be protruded on both sides of the inner surface of the housing to face each other, and to guide the working fluid in both directions through the groove formed between the spaced gaps of the protrusions in both directions. It can also be configured.

According to the present invention as described above, the thickness of the hollow tube can be reduced by pressing and then manufacturing a flat hollow tube with a thickness capable of plastic processing by drawing or extrusion, thereby manufacturing a thin housing. In addition, a heat pipe is manufactured by injecting and filling a working fluid into the housing to seal the housing, thereby providing a thin heat pipe that cannot be processed by drawing or extrusion, and furthermore, a hollow pipe composed of a flat body and a side wall body. By manufacturing a housing having a substantially rectangular cross section, it is possible to provide a thin flat plate heat pipe.

In particular, since the side wall body and / or the partition wall of the housing constituting the hollow tube form an inclination with respect to the flat body forming the upper and lower surfaces of the housing, the pressing force due to the compression acting on the side wall body and / or the partition wall when the hollow tube is crimped. The yield strength can be attenuated. Accordingly, the side wall and / or the partition wall are easily deformed while being adapted to the pressing force due to the crimp, so that the corrugation of the wave pattern does not occur on the flat plate of the housing, Since the heat pipe can be manufactured to a thin thickness that was not expected by conventional drawing or extrusion processing, it is possible to provide the heat pipe in an ultra-thin in accordance with the recent trend. Accordingly, it is possible to provide a thin heat pipe that is thin and does not have to worry about deterioration due to poor contact with a heat source when the product is applied.

In addition, when the wicks for guiding the working fluid in both directions inside the housing are provided on both sides of the inner surface of the hollow tube, the working fluid can be easily transferred from the inside of the housing through the capillary force of the wick. If the free end of each wick formed on both sides of the inner surface is prevented from facing each other, the wick does not interfere with the movement of the working fluid during movement of the working fluid in spite of the presence of the wick. The fluid can be smoothly flowed, and furthermore, since opposite wicks on both sides of the housing face each other in an alternating state, the free end side of the wick can be easily manufactured to face each other in an unmatched state. Accordingly, not only can the heat dissipation performance of the heat pipe be maintained normally through alternate wicks, but even if the housing is made thin by pressing, the cross sectional area of the housing is not substantially reduced, so that the hollow cross-sectional area can be maintained at a desired size. As a result, the heat capacity of the heat pipe can be maximized compared to the thickness of the housing.

In addition, when the housing is configured so that the space between the free end side of the wick facing each other is formed on both sides of the hollow tube and can be configured to communicate with the working fluid through the gap can easily fill the working fluid inside the housing Can be.

In addition, since the above-mentioned flat hollow tube is pressed to produce a thin housing by rolling through a rolling roll, a thin heat pipe can be easily manufactured, and the hollow tube is continuously supplied to the rolling roll to provide a thin housing. Since it can be prepared a thin heat pipe can be produced in a large amount in a short time.

In addition, since the foreign matter can be removed from the housing in which the working fluid is injected through the degassing process, the working fluid can be purified as well, thereby improving the performance of the working fluid.

1 is a cross-sectional view of a heat pipe formed by drawing or extrusion;

2 is a flowchart sequentially illustrating a manufacturing process of a housing and a thin heat pipe according to an embodiment of the present invention;

3 is a cross-sectional view of the housing manufactured by the manufacturing process of FIG.

4 is a cross-sectional view of the housing shown in FIG. 2 and another embodiment of the manufacturing process;

FIG. 5 is a schematic diagram schematically showing the housing forming step shown in FIG. 2; FIG.

6 and 7 are cross-sectional views of the housing by the finishing step shown in FIG.

8 is a flowchart showing each step shown in FIG. 2 in sequence; And

FIG. 9 is a graph comparing the performance of the general thin housing shown in FIG. 1 and the thin housing according to the present invention. FIG.

Hereinafter, a thin heat pipe and a manufacturing method for the same according to an embodiment of the present invention with reference to the accompanying drawings.

The thin heat pipe manufacturing method of the present invention includes a housing manufacturing step (S10), a working fluid injection step (S20) and a finishing step (S30) as shown in FIG.

Housing manufacturing step (S10) is a step of manufacturing a thin housing 3 suitable for manufacturing a thin heat pipe. In the housing manufacturing step S10, as illustrated in FIGS. 3 to 7, the housing 3 is manufactured in the form of a thin plate having a thickness t smaller than the length l or the width w. The housing manufacturing step (S10) is, for example, as shown in Figure 2 as the primary molding step (S11) for molding the hollow tube 10 and the secondary molding step (S12) for molding the thin housing (3). Can be configured.

The primary forming step (S11) is to manufacture the thin housing 3 of the precise structure having the wick 5 by the plastic processing such as drawing or extrusion, which is relatively unsuitable for precision machining, to the minimum thickness t as possible. It is a process and is a preliminary step for producing a thin heat pipe 1 which cannot be manufactured by drawing or compression because of its relatively precise structure. The primary forming step (S11) is drawn to have a minimum thickness (t) that can be thin while maintaining the shape of the wick 5, etc., before processing the housing 3 to its final form by rolling described below. Or through the extrusion to form a plate-shaped hollow tube 10 as shown in the upper side of Figs.

The hollow tube 10 is a preformed product prepared for manufacturing the thin housing 3, but similarly to the housing 3, the hollow tube 10 is molded into a plate shape having a thickness T thinner than the length l or the width w. As shown in the upper side of Fig. 3 and 6, the hollow tube 10 is connected to the pair of flat body 11, both ends of the flat body 11 arranged to face the hollow (S) inside A rear wall not shown connecting the rear end of the pair of side wall bodies 13 and the flat plate 11 to be formed, and a front end of the front surface which is finished by pressing such as pinching after injection of the working fluid F. It is composed. The plate body 11 and the side wall body 13 provide a hollow S in which the working fluid F is filled. In addition, the hollow tube 10 is provided with a finishing end and a rear wall at the front and rear ends of the flat body 11 and the side wall body 13 to receive the working fluid F in a sealed state.

Here, the above-described flat body 11 is a portion forming the heat transfer surface of the heat pipe 1, as compared to the side wall body 13 or the rear wall forming the thickness of the heat pipe 1 as shown in FIG. The length and / or width are formed to be significantly long. As a result, the heat pipe 1 forms a plate shape as a whole.

In addition, as shown in FIGS. 3 and 4, the flat body 11 is provided with a wick 5 extending in the longitudinal direction on each inner circumferential surface facing up and down. Therefore, when the flat body 11 is completed in the housing 3, the working fluid evaporated from the evaporation unit (one side of the housing) by the wick 5 is transferred to the condensation unit (the other side of the housing) to condense. That is, the working fluid transfers heat transferred to one side of the housing 3 to the other side while reciprocating in the housing 3 to cool the housing 3. At this time, the wick 5 is composed of a projection 21 as shown in Figs. The wick 5 may be formed in the shape of a semicircle or parallelogram as shown in the cross section of the protrusion 21, or alternatively, may be formed in various shapes such as a triangle or a semi-ellipse.

Meanwhile, as the material of the hollow tube 10, stainless steel, copper, aluminum, nickel, or the like may be used in the case of a heat pipe for normal temperature (use temperature range 230 to 500 K).

The hollow tube 10 may be composed of one hollow S surrounded by the flat body 11 or the like, but may be divided into multiple channels as shown in FIGS. 3 and 4. To this end, the hollow tube 10 is hollow (S) is partitioned by a plurality of partition walls 15 to form a plurality of channels (17). Each partition wall 15 is formed to be parallel to the above-described side wall body 13 while the hollow S is divided by a constant distance (equal interval) in the width direction to configure each channel 17 to have the same shape. However, alternatively, the width w of the channel 17 may alternatively be configured.

In particular, the hollow tube 10 is not shown in the case of having a single channel structure, the inner peripheral surface or both sides of the side wall body 13, or in the case of a multi-channel structure as shown in Figs. The plurality of partition walls 15 may be formed in an inclined state. As the side wall body 13 and the partition walls 15 which are inclined in this way are inclined, the secondary forming step S12 described later as shown in FIG. 5. The yield strength to the pressing force generated when the hollow tube 10 is rolled by is greatly attenuated. Accordingly, the hollow tube 10 is easily compressed to provide a thin housing 3 as the thickness T is reduced to a thin thickness t. That is, the housing 3 is easily molded into a thin shape as the side wall 13 and the partition wall 15 are flexibly deformed while being adapted to the pressing force when rolling, and the hollow tube 10 is reduced to a thin thickness t. Therefore, since the flat body 11 is rolled uniformly as a whole, the housing 3 formed into a thin shape by the rolling process forms a flat surface as a whole.

At this time, it is preferable that the inclination angle of the side wall body 13 or the partition wall 15 is in the range of 40 degrees to 70 degrees with respect to the surface of the flat body 11. The inclination angle of 40 ° to 70 ° is an optimal range that reduces the yield strength of the partition wall 15 and the like but does not disturb the flow of the working fluid. When the inclination angle is less than 40 °, the angle between the partition wall 15 and the flat plate 11 is greatly reduced, so that the flow resistance of the working fluid flowing in the housing 3 completed with the heat pipe 1 is greatly increased. As a result, the heat transfer performance of the heat pipe 1 is lowered. On the contrary, when it exceeds 70 °, the yield strength reduction effect of the side wall body 13 or the partition wall 15 decreases, so that the flat body 11 after rolling is reduced. This is because waveform distortion occurs at

On the other hand, the secondary forming step (S12) is, as mentioned above, as a step of rolling the hollow tube 10 formed by drawing or extrusion in the primary forming step (S11) to the housing (3) of the finished product For example, by reducing the thickness (T) of the hollow tube 10 step by step rolling roll 20 arranged in three stages as shown in Figure 5 to a thin thickness (t) as shown in Figure 3 The thin housing 3 is molded.

The thinned housing 3 is thus a thin plate having a length l and / or a width w significantly longer than the width w as in the hollow tube 10, as shown in FIGS. 3 and 4. It consists of the upper body. Accordingly, the housing 3 connects the upper and lower pairs of flat bodies 11 and the left and right pairs of side wall bodies 13 connecting the left and right ends of the flat bodies 11 and the rear ends of the flat bodies, as shown. It consists of an open end in front of the rear wall and the flat body. The flat body 11 and the side wall 13 provide a hollow S for receiving the working fluid F inside the housing 3 through the rear wall and the finishing end. At this time, the partition wall 15 partitioning the side wall body 13 and the hollow S at both ends of the housing 3 has a hollow tube 10 rolled into the housing 3 as shown in FIGS. 3 and 4. In the process of buckling, the thickness T, that is, the height is reduced to form a thin thickness t, and the width w is wider and the inclination angle is larger.

In addition, the thin plate-like housing 3 as described above, as shown in the

lower side

3 and 4, the wick 5 of various forms is formed on the inner peripheral surface of the flat plate (11). This wick 5 is provided with the upper and lower flat bodies 11 as shown so that the working fluid F which operates inside the housing 3 is guided in both directions in the interior of the housing 3, that is, the upper and lower portions, respectively. Each is formed. The wicks 5 are preferably arranged alternately in the width direction as shown. Therefore, the housing 3 can maintain the flow cross section (cross-sectional area of a hollow) formed in the width direction to a desired magnitude | size. Otherwise, if the flow cross section is not kept constant, the housing 3 can greatly increase the flow resistance of the working fluid F, thereby lowering the heat transport capability of the heat pipe 1.

To this end, the wick 5 consists of a groove 23 formed between the plurality of protrusions 21 and each of the protrusions 21, as shown in FIGS. 2 to 7, as mentioned above. The plurality of protrusions 21 protrude from the inner circumferential surface of each of the upper and lower flat plates 11 of the housing 3 as shown, and are formed at a predetermined distance (equal interval) in the width direction, and in the longitudinal direction of the housing 3. It extends and connects the evaporation part and the condensation part of the housing 3 while forming the groove 23 with the protrusion 21 adjacent to the periphery. At this time, each protrusion 21 may be inclined in the same direction as the inclined direction of the inner circumferential surface of the side wall body 13 or the partition wall 15, as shown in FIG. Like the bulkhead 15, it is possible to reduce the flow resistance of the working fluid through the wick (5). In addition, as described above, the groove 23 is a moving passage for returning the working fluid F condensed in the condensation part to the evaporation part and extends in the longitudinal direction of the housing 3 as shown in the same manner as the projection 21. It serves to move the working fluid of the condensation unit to the evaporation unit by capillary force.

In particular, as shown in FIGS. 3 and 4, the wick 5 preferably has respective positions formed on the upper and lower flat bodies 11, that is, free end ends of the protrusions 21 facing each other coincide with each other. Not only are they alternately shifted so as not to face each other, and more preferably, as shown in FIGS. 6 and 7 in the process of injecting the inlet 9 by a pinch or the like, the protrusions 21 and the grooves corresponding to each other up and down Bar 23 is formed in the opposite state as to be engaged with each other, assuming that the cross-sectional area of the injection hole (9) is constant, the structure (g) of the injection hole (9) to be closed by compression is not engaged Since it becomes narrower than time, sealing of the inlet (9) is made more quickly, and thus the amount of loss of the working fluid (F) at the time of degassing described later can be adjusted more precisely. That is, when the projection 21 and the groove 23 are engaged when the injection hole 9 is crimped, the gap between the upper and lower grooves 23 is smaller than the case of FIG. 1 where the gap between the upper and lower grooves 23 is not engaged as shown in FIGS. 3 and 4. Since the closing time of the injection hole 9 by pinch crimping is shorter than in the case of FIG. 1, when considering the characteristic that a large amount of working fluid F is instantaneously boiled and lost during degassing described later, the working fluid F In addition to reducing the amount of loss, it is possible to more precisely control the amount of injection fluid (F) of the completed heat pipe 1 according to the amount of loss, that is, the amount of loss.

Here, as described above, the wicks 5 respectively formed on the upper and lower flat plates 11 may be protrusions as shown in FIGS. 3 and 4 even when the hollow tube 10 is compressed and deformed into the thin housing 3. The free end side ends of 21 are spaced apart by the gap D. FIG. For this purpose, the hollow tube 10 must be compressed at a pressure that can be spaced apart by the gap D between the free end ends of the projections 21 facing each other when rolling, that is, during the molding of the housing 3. Accordingly, even when the housing 3 is manufactured in a thin shape, a gap D is formed between the protrusions 21 facing each other, so that the working fluid F can be communicated through the gap D. Therefore, since the working fluid F injected into the injection hole 9 communicates through the aforementioned gap D, the working fluid F is easily filled therein.

Since the wick 5 is formed in an alternating state as described above on both sides of the housing 3, the working fluid F guided to one side (upper side) of the housing 3 and the other side (lower side) of the housing 3 are provided. The working fluids F guided to each other are limited as much as possible to interfere with each other. Therefore, the working fluid F is smoothly moved even when guided from both sides of the housing 3, respectively.

On the other hand, the working fluid injection step (S20) is a step of injecting the working fluid into the molded housing 3 through the housing manufacturing step (S10), as shown in Figure 8 is open to one end of the housing (3) The working fluid F is injected into the housing 3 through the injection hole 9.

At this time, the working fluid is a heat transfer medium that is housed inside the housing 3 and rapidly transfers heat applied from the heat source to the evaporation unit at one end of the housing 3 to the condensation unit at the other end and discharged to the outside. It is housed in a sealed state in the hollow S shown in 3 and 4. Therefore, the working fluid F is heated and vaporized by the heat of the heat generating source in close contact with the evaporator, cooled in the condensation unit, and recovered to the evaporator through the wick 5. In this case, the working fluid may be methanol, ethanol, ammonia, acetone, fluorocarbon compounds, and water, and the like, taking into account the amount of loss in the degassing step (S30) and the amount of filling accommodated in the final product. The amount of injection into the housing 3 is then determined.

On the other hand, the finishing step (S30) is a step of closing the inlet (9) of the housing 3 to finish the manufacture of the heat pipe (1), as shown in Figure 8, in the above working fluid injection step (S20) The injection hole 9 of the housing 3 into which the working fluid F is injected is pressed and sealed with a pinch or the like to complete a series of heat pipe 1 manufacturing processes.

Therefore, the heat pipe 1 manufactured through the above steps, for example, as shown in FIG. 3, as can be seen in the graph of FIG. 9, compared with the conventional heat pipe 101 shown in FIG. 1, Since the buckling deformation of the partition wall 15 and the side wall body 13 is relatively small, and therefore the cross-sectional area reduction of the housing 3 after rolling is also relatively small, the thermal resistance is significantly reduced. That is, under the same conditions, the heat pipe 1 having a larger flow cross-section of the working fluid F can release heat at a higher speed than the heat pipe 101 when it is desired to release heat from a heat source of a specific temperature. Will be.

In addition, the heat pipe can be used to the extent that the amount of heat emitted from the condensation unit and the amount of heat absorbed from the evaporator unit are matched, that is, the temperature of the heat pipe in the condensation unit does not rise even when heated in the evaporator unit. When the heat capacity is a range in which the thermal resistance remains constant despite an increase in the heat load, the longitudinal flow cross-sections of the

housings

3 and 103 are the same, and therefore, even if the thermal resistance is the same, Since the flow resistance of the housing 3 is significantly reduced than that of the housing 103, the heat capacity of the heat pipe 1 is greater than the heat capacity of the heat pipe 101. Therefore, in the heat pipe 1 according to the present invention, the usable range A becomes wider than the usable range B of the general heat pipe 1.

On the other hand, the present invention may further include a degassing step (S40). Degassing step (S40) is a foreign matter such as non-condensable gas contained in the housing 3 and the working fluid (F) before or after the injection of the working fluid (F) in the housing 3 in the working fluid injection step (S20) Step to remove it. The degassing step S40 is performed by various methods such as vacuum degassing or heating degassing. In the degassing step (S40), for example, as shown in FIG. 8, a foreign material may be removed by heating the housing 3 into which the working fluid is injected in the above working fluid injection step (S20) according to a heating degassing method. For this purpose, a heating means such as a heating bath 30 may be used as shown in FIG. 5. In this case, the housing 3 is submerged in the heating bath 30 in the state in which the working fluid F is injected and heated by the bath. When the housing 3 is heated by the heating bath 30 as described above, the housing 3 is fired by nitrogen, oxygen, moisture, or nitrogen, which is adsorbed on the inner wall, or dissolved in the working fluid F. Foreign matter containing condensate gas is vaporized. The vaporized foreign matter is then removed out of the housing 3 through the inlet 9 together with the working gas in a boiling gaseous or liquid state.

The foregoing embodiments are merely illustrative of the preferred embodiments of the present invention, and therefore the scope of application of the present invention is not limited to such, and, if essential features can be met, appropriate modifications (structure or configuration of the Change, partial omission or supplement). In addition, the above-described embodiments may be a combination of some or several of the features. Therefore, since the structure and configuration of each component shown in the embodiment of the present invention can be carried out by modification or combination, it is natural that such a modification and combination of the structure and configuration belong to the appended claims.

Claims

Housing manufacturing step (S10) for manufacturing a thin hollow housing (3);

A working fluid injection step (S20) of injecting a working fluid (F) operating in the housing (3) into the housing (3); And

And a closing step (S30) of sealing and sealing the injection hole 9 of the housing 3 into which the working fluid F is injected.

The housing manufacturing step (S10),

Primary molding step (S11) of forming a flat hollow tube 10 to a thickness (T) capable of plastic processing by drawing or extrusion; And

The secondary tube forming step (S12) for pressing the hollow tube 10 to form a thin housing 3 so that the thickness (T) of the hollow tube 10 is reduced; manufacturing a thin heat pipe Way.
The method of claim 1, wherein the primary forming step (S11),

A pair of flat bodies 11 providing a plane to the housing 3 and a pair of side walls 13 formed to have a width smaller than the width of the flat bodies 11 to connect both ends of the flat body 11. ) And a flat heat pipe (10) formed by the flat plate (11) and the side wall body (13) to have a hollow (S).
The method of claim 2, wherein the primary forming step (S11),

The yield strength of the side wall body 11 is attenuated so that the side wall body 11 flexes and deforms while conforming to the side wall body 11 due to the pressing force provided to the flat body 11 through the secondary molding step S12. The manufacturing method of the thin heat pipe (11) shape | molds the said hollow tube (10) of flat form in the shape which inclines with respect to the said flat body (11).
The method of claim 3, wherein the primary forming step (S11),

The method of manufacturing a thin heat pipe, characterized in that for forming the hollow tube (10) so that the side wall body (11) makes an inclination of 40 ° to 70 ° with respect to the flat plate (11).
The method of claim 2, wherein the primary forming step (S11),

The plurality of channels 17 are provided in the hollow tube 10 by dividing the hollow S of the hollow tube 10 while being parallel to the side wall body 11 connected to the flat body 11. A thin heat pipe for forming the partition wall 15 together with the hollow tube (10).
The method of claim 5, wherein the primary forming step (S11),

The partition wall 15 is inclined with respect to the flat plate 11 so that the yield strength of the partition wall 15 is attenuated so that the partition wall 15 flexes and deforms due to the pressing force applied to the hollow tube 10. Method for producing a thin heat pipe for forming the hollow tube (10) to form a form.
The method of claim 6, wherein the primary forming step (S11),

Method for producing a thin heat pipe, characterized in that for forming the hollow tube (10) so that the partition wall (11) to the inclination of the plate body 11 to 40 ° to 70 °.
The method of claim 1, wherein the primary forming step (S11),

A plurality of projections 21 on both sides of the inner surface of the hollow tube 10 is formed in a flat shape so that the working fluid (F) operating in the housing (3) is guided in both directions inside the housing (3). Method for producing a thin heat pipe for forming a wick (5) consisting of a) together with the hollow tube (10).
The method of claim 8, wherein the primary forming step (S11),

The wick 5 formed on one side of the inner surface of the hollow tube 10 to prevent interference between the working fluids (F) respectively guided in both directions through the wick (5) inside the housing (3) and A thin heat pipe for forming the wick 5 together with the hollow tube 10 in a state where the free end side ends of the wick 5 formed on the other side of the inner surface of the hollow tube 10 are prevented from coinciding with each other. Manufacturing method.
The method of claim 9, wherein the primary forming step (S11),

And forming the wick (5) together with the hollow tube (10) such that the free end ends of the wicks (5) alternate with each other.
The method according to claim 1, wherein the secondary molding step (S12),

The hollow tube 10 is pressed by rolling to reduce the thickness T of the hollow tube 10 to a thin thickness t.
The method according to claim 1, wherein the primary forming step (S11),

A pair of flat bodies 11 providing a plane to the housing 3 and a pair of side walls 13 formed to have a width smaller than the width of the flat bodies 11 to connect both ends of the flat body 11. And the hollow tube 10 of the flat plate shape so as to have a hollow S by the flat plate 11 and the side wall 13,

The yield strength of the side wall body 11 is attenuated so that the side wall body 11 flexes and deforms while conforming to the side wall body 11 due to the pressing force provided to the flat body 11 through the secondary molding step S12. (11) to form the flat hollow tube 10 in the form of the inclined to the flat body 11,

The secondary molding step (S12),

The hollow tube 10 is pressed by rolling to reduce the thickness T of the hollow tube 10 to a thin thickness t.
The method of claim 12,

The primary molding step (S11) is carried out before the secondary molding step (S12),

A plurality of channels 17 are formed inside the hollow tube 10 by dividing the hollow S of the hollow tube 10 while being connected to the flat body 11 and parallel to the side wall body 11. Forming the partition wall 15 together with the hollow tube 10, or

A plurality of protrusions 21 are formed on both sides of the inner surface of the flat hollow tube 10 such that the working fluid F operating inside the housing 3 is guided in both directions inside the housing 3. Thin heat pipe for forming the wick (5) together with the hollow tube (10).
The method of claim 13, wherein the primary forming step (S11),

The partition wall 15 is inclined with respect to the flat plate 11 so that the yield strength of the partition wall 15 is attenuated so that the partition wall 15 flexes and deforms due to the pressing force applied to the hollow tube 10. Method for producing a thin heat pipe for forming the hollow tube (10) to form a form.
The method of claim 13, wherein the primary forming step (S11),

The free end side ends of the wicks 5 alternate with each other so that the free end side ends of the wicks 5 formed on both sides of the inner surface of the housing 3 are prevented from coming into close contact by the pressing force of the secondary forming step S12. Method for producing a thin heat pipe, characterized in that for forming the wick (5) together with the hollow tube (10).
The method of claim 15, wherein the secondary forming step (S11),

A method of manufacturing a thin heat pipe by rolling the hollow tube (10) at a pressure that can be spaced apart between the free end side ends of the wick (5) formed on both sides of the inner surface of the housing (3).
The method of claim 1,

And a degassing step (S40) for removing foreign matters contained in the working fluid (F) and the housing (3) before or after the working fluid injection step (S20).
In the manufacturing method of the housing for thin heat pipes,

Primary molding step (S11) of forming a flat hollow tube 10 to a thickness (T) capable of plastic processing by drawing or extrusion; And

And a secondary forming step (S12) of pressing the hollow tube 10 to form the thin housing 3 by compressing the hollow tube 10 so that the thickness T of the hollow tube 10 is reduced. Manufacturing method.
The method of claim 18, wherein the secondary forming step (S12),

The hollow tube 10 is pressed by rolling to reduce the thickness (T) of the hollow tube 10 to a thin thickness (t) of the manufacturing method of the housing for thin heat pipes.
A thin hollow housing (3) having a hollow (S) provided therein as manufactured by the first forming step (S11) and the second forming step (S12) of claim 18;

A working fluid filled in the hollow S of the housing 3 and evaporated at one side of the housing 3 by heat transferred to the housing 3 to condense at the other side of the housing 3 while transferring heat. (F); And

The interior of the housing 3 through a groove 23 formed between a plurality of protrusions 21 which protrude on both sides of the inner surface of the housing 3 to face each other, and are formed between the spaced gaps of the protrusions 21. A wick (5) for guiding the working fluid (F) in both directions; a thin heat pipe comprising a.
The wick 5 according to claim 20,

Protrusions are formed on both sides of the inner surface of the housing 3 so as to face each other in a state in which the free end side ends of the protrusions 21 facing each other on both sides of the inner surface of the housing 3 are prevented from coinciding with each other.

The protrusion 21,

A thin heat pipe facing each other in a state where the free end side ends face each other in an alternating state on both sides of the inner surface of the housing (3).
The method of claim 20, wherein the housing (3)

A pair of flat bodies 11 having the wicks 5 formed on the inner side thereof and opposing each other; And

And a pair of side wall bodies 13 which connect the flat bodies 11 to provide the hollows S inside the flat bodies 11.

The side wall body 13,

Thin heat pipe having an inclination with respect to the flat plate (11).
In the manufacturing method of the housing for thin heat pipes,

Primary molding step (S11) of forming a flat hollow tube 10 to a thickness (T) capable of plastic processing by drawing or extrusion; And

And a secondary molding step (S12) of pressing the hollow tube 10 to form the thin housing 3 so as to reduce the thickness T of the hollow tube 10.

The primary molding step (S11),

A pair of flat plates 11 and the flat plates 11 facing each other are provided to provide a hollow S in the inside of the flat plates 11, and are generated by the pressing of the secondary forming step S12. The pair of sidewalls 13 having an inclination with respect to the flat body 11 so that the yield strength of the hollow tube 10 with respect to the pressing force is attenuated so that the flat body 11 becomes a flat surface as a whole even after pressing. By forming the hollow tube 10 is formed by drawing or extrusion through the hollow,

The secondary molding step (S12),

The hollow tube 10 is pressed by rolling to reduce the thickness (T) of the hollow tube 10 to a thin thickness (t) of the manufacturing method of the housing for thin heat pipes.
A thin hollow housing (3) composed of the flat plate (11) and the side wall body (13) having an inclination according to claim 23, and having a hollow (S) therein;

A working fluid filled in the hollow S of the housing 3 and evaporated at one side of the housing 3 by heat transferred to the housing 3 to condense at the other side of the housing 3 while transferring heat. (F); And

The interior of the housing 3 through a groove 23 formed between a plurality of protrusions 21 which protrude on both sides of the inner surface of the housing 3 to face each other, and are formed between the spaced gaps of the protrusions 21. A wick (5) for guiding the working fluid (F) in both directions; a thin heat pipe comprising a.
The wick 5 according to claim 24,

Protrusions are formed on both sides of the inner surface of the housing 3 so as to face each other in a state in which the free end side ends of the protrusions 21 facing each other on both sides of the inner surface of the housing 3 are prevented from coinciding with each other.

The protrusion 21,

A thin heat pipe facing each other in a state where the free end side ends face each other in an alternating state on both sides of the inner surface of the housing (3).
The wick 5 according to claim 25,

A thin heat pipe having a gap between the free end side ends of the protrusions (21) facing each other on both inner surfaces of the housing (3).
The method according to claim 24, wherein the housing (3)

Parallel to the side wall body 13, partition wall 15 for dividing the hollow (S) to provide a plurality of channels 17 in the hollow (S);

The partition wall 15,

A thin heat pipe having an inclination with respect to the flat plate (11) together with the side wall (13).
The method according to claim 27, wherein the housing (3)

The thin heat pipe of which the side wall body 13 and the partition wall 15 are inclined in the same direction.