KR101787073B1 - Heat dissipation frame for Carbon nanotube and LED lighting apparatus therewith - Google Patents

Abstract

The present invention can significantly improve the thermal conductivity, the heat release rate and the heat release rate by replacing the material of the heat dissipating body or the heat dissipation assembly with the conventional heat dissipation material of the carbon nanotube instead of aluminum, and the heat dissipation assemblies can be slid on the outer surface of the heat dissipation body So that the equipment can be easily checked and replaced. Also, since the heat insulating plates of the heat radiation assemblies that are provided on the LED substrate are spaced apart from each other by the curved portions, heat exchange is more actively performed, , Carbon nanotube heat dissipation materials are produced by crushing and mixing carbon composite materials and metal powders with high thermal conductivity through fine particles, through the first ball milling step and the second ball milling step, and dispersing the carbon composite material So that the thermal conductivity The present invention relates to a carbon nanotube heat dissipating frame and a LED lighting device having the carbon nanotube heat dissipating frame, which can reduce the volume and volume of the carbon nanotube.

Description

Technical Field [0001] The present invention relates to a carbon nanotube heat dissipating frame,

The present invention relates to a carbon nanotube heat dissipating frame and an LED lighting device having the same, and more particularly, to a heat dissipating frame which is improved in heat radiation efficiency as compared with a conventional aluminum heat radiating frame, The present invention relates to a carbon nanotube heat dissipation frame and an LED lighting device having the carbon nanotube heat dissipation frame.

In general, a lighting device is defined as a device that converts light energy into electrical energy to provide a light source. As the lighting industry and infrastructure develop, approximately 20% of the total electricity consumption is used for illumination purposes.

In particular, LED lighting devices can save energy resources due to low power consumption, and are eco-friendly materials such as mercury and greenhouse gases (CO2) that emit less waste. And it has been attracting attention as a next-generation lighting.

However, since the LED lighting device emits light of a high luminance from a small device, local heat is generated in the device. In particular, in recent years, when miniaturization and integration of a product are required, when LED chips are installed in a dense manner, The circuit is not normally operated, or the life of the LED is shortened.

That is, when the LED lighting device fails to appropriately heat the heat generated when the LED light is emitted, the performance and the life of the LED lighting device are seriously affected. Therefore, various studies are being conducted to maximize the heat radiation efficiency.

Accordingly, the applicant of the present invention has proposed a light emitting diode (LED) lighting device having a light emitting diode (LED), a light emitting diode (LED) A heat-radiating frame capable of raising the heat-dissipating efficiency through the use of a heat-radiating frame made of a heat-radiating plate, I will explain.

1 is a perspective view showing a heat dissipation frame disclosed in Korean Patent No. 10-1200309 (entitled: LED lamp).

The heat dissipation frame 100 of FIG. 1 (hereinafter referred to as a conventional technique) is formed in a rectangular column shape having a vertical length and has substrate contact surfaces 137, 137 ', 137' 'formed on the respective surfaces of the rectangular column. And 145 'formed in the connecting portion of the substrate contact surfaces 137, 137', 137 '', 137 '' 'and 137' '' , 145 '', and 145 '' '.

In the prior art 100, a through hole 133, which is a passage through which air flows in the longitudinal direction, is formed. The upper and lower portions of the through hole 133 are opened to allow external cold air to flow through the lower opening, Hot air is discharged to the outside through the upper opening.

In addition, the heat radiating vanes 134 protruding inward from the inner surface are formed in the inner surface of the conventional technology 100, and the heat radiating vanes 134 are formed in such a manner that the heat generated by the LED module (not shown) Thereby increasing the heat radiation area in contact with the cold air.

In the conventional art 100 configured as described above, since the LED module is provided on the substrate contact surface formed on each surface having various angles, the light uniformity is improved and the ventilation portion of the heat radiation frame protrudes outside the diffusion cover, So that heat exchange can be actively performed to maximize heat radiation efficiency.

In other words, the method for increasing the heat radiation efficiency of the heat radiation frame applied to the LED lamp is as follows: 1) the modification of the structure and the shape of the frame as described above in FIG. 1; and 2) the thermal conductivity of the composition forming the frame However, since the structure and the shape of the frame made of aluminum material are simply modified by the conventional technology 100, the increase rate of the heat radiation efficiency is limited.

In addition, the conventional art 100 has a disadvantage in that the weight and volume of the product excessively increase in order to have a desired heat radiation effect due to the characteristics of aluminum having a high specific gravity, and accordingly, it can not satisfy the recent trend of miniaturization and integration.

In addition, the conventional art 100 has a problem of increasing the manufacturing cost of a product by manufacturing a frame using a high-cost aluminum material.

In view of the structure and the shape of the frame, the prior art 100 is characterized in that the substrate contact surfaces 137, 137 ', 137' ', 137' '' Since the surface to be contacted is limited only to the rear surface connected to the through hole 133, there is a structural limitation to increase the heat radiation efficiency.

In addition, the prior art 100 also discloses that the LED substrate and diffuser plate attached to the substrate contact surfaces 137, 137 ', 137' ', 137' '' It is necessary to separate the LED substrate and the diffusion plate from the substrate contact surface. However, in this case, since the LED substrate and the diffusion plate, which have been checked and replaced, must be slid into the substrate contact surface and then subjected to post-treatment for waterproof treatment separately, Have complex structural limitations.

In other words, depending on the characteristics of the LED module, which is slimmer and heat-generating, it can increase the assembly efficiency as well as heat efficiency by changing the structure and shape of the heat-radiating frame. 2) It is urgent to research to maximize the heat efficiency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a heat dissipating body or a heat dissipating assembly which can replace a conventional aluminum material with a carbon nanotube heat dissipating material, thereby significantly increasing thermal conductivity, And a LED lighting device having the same.

Another object of the present invention is to provide a heat dissipating body having guide grooves on an outer surface of a heat dissipating body, wherein the heat dissipating assemblies are slidably attached to the guide grooves, thereby facilitating assembly and disassembly, A carbon nanotube heat dissipating frame and an LED lighting device having the same.

According to another aspect of the present invention, there is provided a heat dissipating structure, comprising: a heat dissipation assembly attached to a heat dissipation body comprises a first heat dissipation assembly having an off-white color of aluminum, and second heat dissipation assemblies having a black color of a carbon nanotube dissipation platoon, The first and second heat dissipation assemblies are alternately arranged on the outer surface of the heat dissipation body so that the aesthetic, aesthetic efficiency and design effect can be enhanced, and the design effect can be maximized. And to provide a lighting device.

In addition, another object of the present invention is to provide a carbon nanotube heat dissipating frame capable of further enhancing the heat radiation efficiency by allowing the heat exchanging plates of the heat dissipating assembly to be separated from each other by the curved portions, And to provide an LED lighting device having the LED lighting device.

Another object of the present invention is to provide a heat dissipating assembly which is characterized in that a thread is formed on the inner circumferential surface of the lower end portion of the curved portion of the heat dissipating assembly and the bolt holes are formed in the corresponding heat dissipating plate, And the heat dissipation plate, as well as the head of the bolt is exposed to a surface of the heat dissipation plate opposite to the surface of the heat dissipation plate, so that bolt fastening and disassembly can be facilitated, and an LED lighting device having the same .

Another object of the present invention is to provide a method of manufacturing a carbon nanotube heat dissipation material by crushing and mixing a carbon composite material and a metal powder having high thermal conductivity into fine particles through a first ball milling step and a second ball milling step, The carbon nanotube heat-radiating frame and the carbon nanotube heat-radiating frame, which can reduce the volume and volume of the carbon nanotube, And to provide an LED lighting device having the LED lighting device.

According to an aspect of the present invention, there is provided an LED lighting device including LED substrates on which LED modules are mounted, and a heat dissipation frame for dissipating heat generated by the LED modules, A heat dissipating plate including a disk-shaped heat dissipating plate having a through hole formed therein; A heat dissipating body formed in a cylindrical shape having an upper and a lower portion opened and having an air movement hole formed therein and installed perpendicularly to a mating surface which is one surface of the heat dissipating plate; And at least one heat dissipating assembly coupled to the heat dissipating body, the heat dissipating assembly being detachably coupled to the outer surface of the heat dissipating body at intervals along an arc, wherein at least one of the heat dissipating assemblies Wherein the carbon nanotube heat dissipation material is manufactured by mixing the metal powder with 70 to 90 wt% and the carbon composite material with 10 to 30 wt%; A ball milling step of mixing the metal powder and the carbon composite material stirred by the stirring step with an organic solvent and ball milling the mixture; And a heat treatment and dispersion step of mixing a crushed material crushed with fine particles by the ball milling step with polyethylene glycol (PEG, polyethylene glycol) and a polyester binder, and blending the mixed mixture while heating And the ball milling step includes supplying the metal powder and the carbon composite material, which have been stirred by the stirring step, to a ball mill jar containing balls, rotating the mixture at a speed of 200 to 250 rpm, A primary ball milling step of crushing the composite material first; And a second ball milling step of secondarily crushing the crushed material by the primary ball milling step at a speed of 200 to 250 rpm using balls having a diameter smaller than that of the ball used in the primary ball milling step , The primary ball milling step and the secondary ball milling step are performed by mixing 15 to 20% by weight of a mixture of a metal powder and a carbon composite material and 80 to 85% by weight of an organic solvent, Stearic acid is added in an amount of 1.5 to 2.5% by weight based on the total weight to promote dispersion of the material.

Further, the heat dissipating body may further include guide grooves formed inward from the outer side of the heat dissipating body and extending in the height direction, the guide grooves being spaced apart along the arc, and the heat dissipating assemblies include: A plate-shaped support portion vertically connected to one surface of the mounter plate; And an insertion portion inserted into the guide groove in a sliding manner by being vertically connected to the end portion of the support portion.

Also, in the present invention, the accommodating plates are formed of a first accommodating plate and a second accommodating plate spaced apart from each other, and the heat radiating assemblies are formed in a U-shape in cross section, A curved portion connected to the end portions of the second treatment plate and coupled to the support portion on the other side; And a swash plate disposed obliquely at the outer ends of the first and second accommodating plates opposite to the end portions connected to the curved portion.

In addition, when the heat dissipating assemblies are inserted into the guide grooves of the heat dissipating body, the lower end portions of the heat dissipating assemblies are accommodated on a surface of the heat dissipating plate, and the heat dissipating assemblies are threaded on the inner circumferential surface of the bending portion, And the heat radiating plate is formed with bolt holes spaced along an arc around the through hole, and the heat radiating assemblies are coupled to the heat radiating plate through bolting.

Further, in the present invention, the heat dissipation plate may further include insertion holes penetrating through both sides of the through hole and the bolt holes, and the heat dissipation assemblies may include protrusion formed on an end surface of the support portion, Preferably, when the heat dissipating assemblies are coupled to the heat dissipating plate, the dissipation preventing protrusions are inserted into the insertion holes of the heat dissipating plate to prevent vibration and shaking of the heat dissipating assemblies.

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Also, in the present invention, the heat treatment and dispersion step may be performed by rotating the polyethylene glycol (PEG) at a speed of 50 to 70 rpm for a predetermined period of time, heating the heated polyethylene glycol (PEG) (PEG), the volume fraction of the polyethylene glycol (PEG) and the metal powder is 4, and the melting point of the polyethyleneglycol It is preferable that the volume fraction of the composite material-PEG precursor is 6.

In the present invention, the primary ball milling step is performed for one hour period, then the process is stopped for 30 minutes, and the process performed for one hour period is repeated four times, It is preferable to perform the milling process for 5 hours.

In the present invention, the carbon composite material may be a single-walled carbon nanotube (SWCNT), a double-walled carbon nanotube (DWCNT), a multi-walled carbon nanotube (MWCNT) nanotube, a rope carbon nanotube, or a combination thereof, and the polyethylene glycol (PEG) in the heat treatment and dispersion step preferably has a molecular weight of 15,000 to 20,000 MW.

The heat dissipating assembly may include a first heat dissipating assembly made of aluminum and a second heat dissipating assembly made of the carbon nanotube heat dissipating material. When the heat dissipating assemblies are attached to the heat dissipating body, It is preferable that the second heat dissipation assemblies are alternately installed in an alternating manner.

According to the present invention having the above-mentioned problems and solutions, the thermal conductivity, the heat release rate and the heat release rate can be remarkably increased by replacing the material of the heat dissipating body or the heat dissipation assembly with the conventional carbon nanotube heat dissipation material.

In addition, according to the present invention, since the guide grooves are provided on the outer surface of the heat dissipating body, the heat dissipating assemblies are slidably attached to the guide grooves, thereby facilitating assembly and disassembly, facilitating equipment inspection and replacement.

In addition, according to the present invention, the heat dissipating assemblies attached to the heat dissipating body include a first heat dissipating assembly having an off-white color of aluminum and second heat dissipating assemblies having a black color of a carbon nanotube heat dissipating platoon, The heat dissipation assemblies are alternately arranged alternately on the outer surface of the heat dissipating body so that aesthetic, aesthetic efficiency and design effect can be enhanced and the design effect can be maximized.

In addition, according to the present invention, the heat exchanging plates of the heat dissipating assembly that are provided on the LED substrate are formed to be spaced apart from each other by the curved portions, so that heat exchange is more actively performed, and the heat radiation efficiency can be further increased.

According to the present invention, since threads are formed on the inner circumferential surface of the lower end of the curved portion of the heat dissipating assembly, which is accommodated in the heat dissipating plate of the heat dissipating plate during assembly, and the bolt holes are formed in the corresponding heat dissipating plate, So that the bolt head is exposed to the surface of the heat dissipating plate opposite to the surface of the heat dissipating plate so that bolt fastening and disassembling can be easily performed.

According to the present invention, the carbon composite material and the metal powder having high thermal conductivity are crushed and mixed into fine particles through the first ball milling step and the second ball milling step in manufacturing the carbon nanotube heat dissipation material, By ensuring the dispersibility of the material, it is possible to induce production of lightweight by reducing volume and volume as well as excellent thermal conductivity as compared with conventional aluminum, and production cost can be reduced.

1 is a perspective view showing a heat dissipation frame disclosed in Korean Patent No. 10-1200309 (entitled: LED lamp).
2 is a perspective view illustrating a carbon nanotube heat radiating frame according to an embodiment of the present invention.
FIG. 3 is a perspective view showing the heat dissipating plate of FIG. 2. FIG.
4 is a perspective view showing the heat dissipating body of FIG. 2. FIG.
5 is a top plan view of Fig.
6 is a perspective view showing the heat dissipation assembly of FIG. 2. FIG.
Fig. 7 is a bottom view of Fig. 6 as seen from the bottom. Fig.
FIG. 8 is an exemplary view illustrating a process of installing the heat dissipating assembly of FIG. 6 on the heat dissipating body of FIG.
9 is a side cross-sectional view showing an assembled state of the heat dissipating assembly and heat sink of the present invention.
10 is a perspective view illustrating a heat dissipating plate, a heat dissipating body, and a heat dissipating assembly according to the present invention.
11 is a process flow chart showing a method of manufacturing a carbon nanotube heat dissipation material applied to the heat dissipation assembly of the present invention.
12 is a SEM (Scanning Electron Microscope) photograph showing the surface of Example 1 and Comparative Examples 1 and 2 measured by FESEM (Field Emission Scanning Electron Microscope) surface analysis.
13 is a graph showing the XRD pattern results of Examples 1 and 2 and Comparative Example 1. Fig.
14 is a graph showing the structural analysis by FT-IR of Examples 1 and 2 and Comparative Example 3. Fig.
15 is a graph showing the thermal conductivities of Examples 1 and 2 and Comparative Example 3. Fig.
FIG. 16 is a graph showing the temperature for two hours during which light is emitted by mounting the LED lamps according to Examples 1 and 2 and Comparative Example 2. FIG.
Fig. 17 (a) shows the heat dissipation characteristics of the heat dissipation body to which the conventional aluminum material is applied, and Fig. 17 (b) shows the heat dissipation characteristics of the heat dissipation body to which the carbon composite material of the present invention is applied.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view illustrating a carbon nanotube heat radiating frame according to an embodiment of the present invention.

The carbon nanotube heat-radiating frame 1 according to one embodiment of the present invention is intended to maximize the radiating efficiency through the modification of the material 1) while improving the assembling property and the radiating efficiency through the modification of the structure and the shape.

2, the heat dissipating frame 1 includes a heat dissipating plate 3, a heat dissipating body 5, and a heat dissipating assembly 7.

For convenience of explanation, the LED substrate 9 is installed in the heat dissipation assemblies 7 of the heat dissipating frame 1, for example.

The heat radiating frame 1 thus constructed can be applied to LED lighting apparatuses of various shapes and configurations. Specifically, an LED substrate (not shown) and a diffusing plate (not shown) are mounted on the upper ends of the heat radiating body 5 and the heat radiating frames 7, (Not shown), and a socket portion for supplying electric power to the lower surface of the heat dissipating plate 3 can be coupled.

FIG. 3 is a perspective view showing the heat dissipating plate of FIG. 2. FIG.

3, the heat dissipating plate 3 includes a disk-shaped heat dissipating plate 31, a vertical portion 33 vertically connected from the outer edge of the heat dissipating plate 31, Radiating fins (35) which are vertically protruded and extend in the height direction and are formed at intervals along the arc.

The heat radiating plate 31 is made of a metal material having high thermal conductivity, such as aluminum, and is formed of a circular plate material.

Also, the heat radiating plate 31 has a through hole 311 passing through both sides at its center.

In the heat sink 31, a plurality of bolt holes 313 are formed around the through hole 311 at intervals along the arc. At this time, a screw thread 7131 is formed on the inner peripheral surface of the bolt holes 313.

Also, the heat sink 31 is formed at intervals in the circumferential direction along the arc, with the insertion holes 315 at positions aligned with each other away from the center of the bolt holes 313 from the center. At this time, the separation preventing protrusions 731 of the heat dissipating assembly 7 of FIG. 7 described later are inserted into the insertion holes 315, respectively.

The vertical portion 33 is vertically connected from the outer edge of the heat sink 31 and is formed to be connected along the arc.

Further, on the outer surface of the vertical portion 33, heat dissipation fins 35 are formed with an interval.

The radiating fins 35 protrude outward from the outer surface of the vertical portion 33 and are formed to be connected in the height direction.

The radiating fins (35) are formed on the outer surface of the vertical portion (33) at intervals along an arc.

The heat dissipating plate 3 having the above structure is constructed such that the heat dissipating body 5 and the heat dissipating assembly 7 are vertically installed on the surface 310 of the heat dissipating plate 31 in the direction in which the vertical part 33 is connected, 5 and the heat dissipating assemblies 7, and the transmitted heat is heat-exchanged through the heat dissipating fins 35, so that the heat radiation efficiency can be remarkably increased.

FIG. 4 is a perspective view of the heat dissipating body of FIG. 2, and FIG. 5 is a plan view of the heat dissipating body of FIG. 4 viewed from above.

The heat dissipating body 5 shown in Figs. 4 and 5 is formed in a cylindrical shape having upper and lower portions opened and an air movement hole 55 formed therein.

In addition, the heat dissipating body 5 is formed with guide grooves 51 extending in the height direction on the outer side inward. At this time, the guide grooves 51 are formed on the outer surface of the heat dissipating body 5 at intervals.

The guide grooves 51 are formed by vertical surfaces 513 and 513 'vertically connected inward from the outer surface of the heat dissipating body 5 and flat surfaces 513 and 513' And a bottom surface 511 connected to the bottom surface 511.

At this time, the vertical surfaces 513 and 513 'are connected to the outer surface of the heat-dissipating body 95 so that the engagement protrusions 515 and 515' extend in the height direction.

That is, the sliding portions 75 of the heat dissipating assembly 7 of FIGS. 6 and 7, which will be described later, are inserted into the guide grooves 51 in a sliding manner in a direction from the upper portion to the lower portion, Assembly and disassembly can be performed in a simple manner on the outer surface.

The outer surface of the heat dissipating body 5 between the adjacent guide grooves 51 is formed as a curved surface portion 53 to maximize the area of the heat dissipating body 5 with respect to the outside air to efficiently dissipate the heat transferred from the heat dissipating assemblies 7 .

Also, the heat-dissipating body 5 is made of a metal material having a high thermal conductivity or a carbon nanotube heat-radiating material manufactured by FIGS. 11 to 17 described later.

The heat dissipating body 5 having the above structure is installed vertically to the surface 310 of the heat dissipating plate 31 of the heat dissipating plate 3 of FIG. The heat transferred from the heat dissipating assembly 7 to the heat dissipating plate 3 is transferred to the heat dissipating plate 3 so that the heat dissipating body 5 and the heat dissipating plate 3 are heat- do.

FIG. 6 is a perspective view showing the heat dissipating assembly of FIG. 2, FIG. 7 is a bottom view of the heat dissipating assembly of FIG. 6, and FIG. to be.

6 to 8, the heat dissipation assembly 7 includes a substrate contact portion 71, a support portion 73, a sliding portion 75, and a heat dissipation vane 77.

The substrate contacting portions 71 are formed by connecting the plates 711 and 711 'formed as flat surfaces and spaced apart from each other and the ends between the first and second plates 711 and 711' And the inclined plates 715 and 715 'which are inclined at the outer ends of the first and second mating plates 711 and 711'.

The first and second treatment plates 711 and 711 'are formed as flat surfaces and are spaced apart from each other.

The LED substrates 9 mounted with the plurality of LED modules 91 are received by the first and second treatment plates 711 and 711 'so that the heat generated when the LED modules 91 are emitted is directly received . Although not shown in the drawing, guide grooves are formed at the points where the first and second access plates 711 and 711 'and the swash plates 715 and 715' are connected to each other to insert a diffusion cover (not shown) And the shape and configuration of such a diffusion cover can be configured as in Korean Patent No. 10-1706253 (entitled " LED light fixture ").

In addition, when the first and second treatment plates 711 and 711 'are oriented inward to each other, the swash plates 715 and 715' are inclined at outer ends.

In addition, the first and second treatment plates 711 and 711 'are connected at their inner ends to both ends of the curved portion 713.

The curved portion 713 is formed in a U-shape in cross section, and both ends are connected to the inner ends of the first and second facing plates 711 and 711 ', respectively. At this time, the curved portion 713 is connected to the first and second facing plates 711, 711 'so that the curved portion faces the sliding portion 75.

That is, the heat radiation assemblies 7 of the present invention are configured such that the first and second mating plates 711, 711 'are formed as flat surfaces and are brought into wide area on the LED substrate 9, The first and second treatment plates 711 and 711 'are connected to each other by the curved portion 713 so as to be spaced apart from each other, thereby maximizing the contact area with the outside air, , It is possible to remarkably increase the radiating efficiency in comparison with the case where the two facing plates are formed as a single flat surface.

The curved portion 713 is formed with a thread 7131 on the inner circumferential surface of the point adjacent to the end portion of the heat dissipating plate 3 which is accommodated in the heat dissipating plate 31 when assembled. At this time, the inner space of the curved portion 713 is formed to be connected to the bolt hole 313 of the heat sink 31, so that the heat sink assembly 7 can be firmly fixed by bolting.

The support portion 73 is vertically connected to the end portion of the curved portion 713 facing the sliding portion 75. [

The support portion 73 is formed of a flat plate member, vertically connected to the end portion of the curved portion 713, and has a sliding portion 75 at an end thereof.

The supporting portion 73 is formed with a pin-shaped separation preventing protrusion 731 protruding from the lower end surface of the supporting portion 73, which is in contact with the heat dissipating plate 31 of the heat dissipating plate 3 when assembled.

The sliding portion 75 is formed of a flat plate material and is vertically connected to the end portion of the supporting portion 73.

The sliding portion 75 is slidably inserted into the guide grooves 51 of the heat dissipating body 5 of FIGS. 4 and 5 as described above so that the heat dissipating assembly 7 can be detachably attached to the heat dissipating body 5 .

The supporting portion 73 is provided with a plurality of heat dissipating vanes 77 on the outer surface between the point where the sliding portion 75 is connected to the curved portion 713 and the point where the sliding portion 75 is connected, It is possible to efficiently radiate heat.

9 is a side cross-sectional view showing an assembled state of the heat dissipating assembly and heat sink of the present invention.

The heat dissipating assembly 7 of the present invention slides the sliding portion 75 into the guide groove 51 of the heat dissipating body 5 in a direction from the top to the bottom as shown in FIG. And can be easily assembled and disassembled by being coupled to the heat dissipating body 5. At this time, the heat dissipating assembly attached to the heat dissipating body (5) is brought into contact with the heat dissipating plate (31) of the heat dissipating plate (3) at the lower end in the height direction.

The heat dissipating assembly 7 is inserted into the insertion hole 315 of the heat dissipating plate 31 of the heat dissipating plate 3 and at the same time the thread 7131 of the curved portion 713 is protruded from the lower end surface, And the bolt holes 313 of the heat dissipating plate 31 are bolted to the heat dissipating body 5 and the heat dissipating plate 3 by the bolts B,

In other words, as the sliding portion 75 is inserted into the guide groove 51, the sliding portion 75 can be firmly supported from the heat-dissipating body 5, but the sliding portion 75 is opposed to the sliding portion 75 The supporting force is lowered toward the direction, and the shaking of the substrate contact portion 71 increases during vibration and vibration. In order to solve this problem, the present invention solves the above problem. In addition, not only the detachment preventing projection 731 protruding from the lower end of the support portion 73 is inserted into the insertion hole of the heat sink 31 but also the curved portion 713 is bolted to the heat sink The heat dissipating assembly 7 can be firmly coupled to the heat dissipating body 5 and the heat dissipating plate 3 firmly.

10 is a perspective view illustrating a heat dissipating plate, a heat dissipating body, and a heat dissipating assembly according to the present invention.

8, the heat dissipating frame 1 of the present invention includes a heat dissipating body 5 vertically coupled to a heat dissipating plate 31 of the heat dissipating plate 3, The heat dissipating assemblies 7 are inserted into the through holes 51.

In this case, the heat dissipating assembly 7 includes a first heat dissipating assembly 710 made of aluminum and having an off-white hue, and a first heat dissipating assembly 710 made of the carbon nanotube heat dissipating material manufactured according to FIGS. 11 to 17, And a second heat dissipating assembly 720.

The first heat dissipating assembly 710 and the second heat dissipating assembly 720 are alternately and alternately attached to the guide grooves 51 of the heat dissipating body 5.

As described above, the heat dissipating frame 1 according to an embodiment of the present invention includes the first heat dissipating assembly 710 made of aluminum and the second heat dissipating assembly 720 made of the carbon nanotube heat dissipating material so as to cross each other, As a result, the specific gravity is reduced due to the carbon nanotube heat-dissipating material, and the weight and volume of the product are lowered. Thus, it is possible to meet the recent trend of miniaturization and integration.

Further, since the heat dissipating frame 1 according to the present invention is provided with the second heat dissipating assemblies 720, which are materials of the carbon nanotube heat dissipating material, it is possible to reduce the manufacturing cost as compared with the case where only the expensive aluminum material is manufactured, Speed and heat release rate can be remarkably improved.

In the present invention, the first and second heat dissipating assemblies 710 and 720 are alternately installed on the outer surface of the heat dissipating body 5 for the sake of convenience. However, the second heat dissipating assembly 720 may be provided on the outer surface of the heat-dissipating body 5, or at least one of them may be provided.

10 may have an LED substrate (not shown) and a diffusion plate (not shown) coupled to the upper ends of the heat dissipating body 5 and the heat dissipating frame 7, A socket portion for supplying electric power to the surface can be coupled.

11 is a process flow chart showing a method of manufacturing a carbon nanotube heat dissipation material applied to the heat dissipation assembly of the present invention.

A method (S1) for producing a carbon nanotube heat-radiating material is a method for manufacturing a composition applied to the heat-radiating assembly 7 of Figs. 6 and 7 or the heat-radiating body 5 of Figs. 4 and 5 for emitting heat generated during light- will be.

That is, the carbon nanotube heat dissipation material is applied to a lighting device and is used as a heat dissipation material for dissipating local heat generated from the LED.

The manufacturing method (S1) of the carbon nanotube heat dissipation material includes a stirring step (S10), a primary ball milling step (S20), a secondary ball milling step (S30), and a heat treatment and dispersion step (S40).

The stirring step S10 is a step of stirring 70 to 90% by weight of the metal powder and 10 to 30% by weight of the carbon composite material. The carbon composite material may be a single-walled carbon nanotube (SWCNT), a double-walled carbon nanotube (DWCNT), a multi-walled carbon nanotube (MWCNT) The carbon nanotubes (CNTs) may be hexagons formed by six carbon atoms to form a tube shape, and the multiwall carbon nanotubes (MWCNTs) may be formed of a plurality of carbon nanotubes The tubes form concentric circles.

In this case, the metal powder may be composed of a metal powder having high thermal conductivity, and more preferably, it is an aluminum powder.

Also, in the stirring step S10, the carbon composite material does not affect the shape of the heat dissipator, but if the content is less than 10% by weight, the content of the carbon composite material is excessively reduced to lower the thermal conductivity, heat release rate, and heat release rate If the content is more than 30% by weight, dispersion becomes difficult and physical properties of the heat discharging body are deteriorated.

Also, the mixture of the metal powder and the carbon composite material stirred by the stirring step S10 is supplied to the primary ball milling step S20.

The primary ball milling step S20 is a step of first crushing and crushing the mixture of the metal powder and the carbon composite material stirred by the stirring step S10 by using a known ball milling equipment.

In the primary ball milling step S20, 15 to 20% by weight of the mixture of the metal powder and the carbon composite material being stirred and 80 to 85% by weight of the organic solvent are supplied to a ball mill jar And the ball mill is rotated at a rotating speed of 200 to 250 rpm to crush the metal powder and the carbon composite material. At this time, ether, acetone, alcohol and the like can be applied as the organic solvent, and more preferably ethanol.

In the primary ball milling step (S20), 1.5 to 2.5% by weight of a dispersing accelerator may be added to the metal powder, the carbon composite material and the organic solvent. In this case, the dispersing accelerator may promote the dispersion of the carbon composite material Is preferably stearic acid.

Also, the primary ball milling step (S20) is carried out for a cycle (T) of about 1 hour and the rotation is stopped for about 30 minutes after one process in consideration of the characteristic of ethanol generating heat upon friction, If the process is carried out for 1 hour period (T) without performing the process, the process is carried out 4 to 5 times.

In addition, the primary crushed primary crushed by the primary ball milling step (S20) is supplied to the secondary ball milling step (S30).

The secondary ball milling step S30 is a process step for further finely crushing the primary crushed primary crush by the primary ball milling step S20 using a known ball milling equipment.

At this time, the balls applied to the secondary ball milling step (S30) are smaller in diameter than the balls applied to the primary ball milling step (S20).

In the secondary ball milling step S30, the primary pulverized material (metal powder + carbon composite material) firstly crushed by the primary ball milling step S30 and the ball mill jar containing the organic solvent And then the ball mill is rotated at a rotating speed of 200 to 250 rpm for about 3 to 5 hours to further finely crush the primary pulverized product.

The secondary pulverized material (metal powder + carbon composite material) crushed by the secondary ball milling step (S30) is supplied to the heat treatment and dispersion step (S40).

In the heat treatment and dispersion step (S40), the carbon composite material of the second order pulverized material supplied from the second ball milling step (S30) has a high cohesive force and low dispersibility, and the mechanical properties of the metal powder and the carbon composite material are different, This is a process step for dispersing and embedding a carbon composite material in a finely pulverized metal powder in consideration of characteristics.

In this case, embedded is defined as a phenomenon in which a carbon composite material adheres to a part of the metal powder whose surface is amorphized while being finely crushed through the first and second ball milling steps (S20, S30).

The heat treatment and dispersion step S40 uses polyethylene glycol (hereinafter referred to as PEG) as a solvent for mixing the metal powder and the carbon composite material of the secondary pulverization supplied from the secondary ball milling step S30 .

Here, polyethylene glycol (PEG) is polyethylene glycol having a molecular weight of approximately 15,000 to 20,000 MW.

In addition, the heat treatment and dispersion step (S40) adds a polyester binder to increase the viscosity of the mixture.

In the heat treatment and dispersion step (S40), polyethylene glycol (PEG) is first rotated at a speed of 50 to 70 rpm using a known twin screw mixer, and at the same time, at a temperature of 65 to 75 캜, which is the melting point of polyethylene glycol (PEG) Lt; / RTI > Thereafter, the secondary particles (metal powder + carbon composite material) and the polyester binder are put into a heated polyethylene glycol (PEG), and these compounds (PED + metal powder + carbon composite material + polyester binder) It is rotated at a speed of 50 to 70 rpm and is heated at a temperature of 65 to 75 ° C for 30 minutes.

That is, in the heat treatment and dispersion step (S40), the carbon nanotube heat-radiating material of the present invention is produced by melting and blending the compound so that the carbon composite material is uniformly dispersed and embedded in the metal powder.

Preferably, the volume fraction of polyethylene glycol (PEG) and metal powder is 4 and the volume fraction of the carbon composite-PEG precursor is 6 in the heat treatment and dispersion step (S40).

11, the carbon nanotube heat-radiating material includes a metal powder, a carbon composite material, a binder, and PEG. When heat is applied to the heat radiation material for processing, the binder is spun and the PEG is volatilized. And the heat dissipation efficiency of the LED is increased due to the heat dissipation from the LED heat dissipation structure through the air gap.

Example 1 is a heat dissipation material made of a heat dissipation material to which 20 wt% of carbon nanotubes (CNT) and 80 wt% of aluminum powder are added in the stirring step S10 of Fig.

Example 2 is a heat dissipation material made of a heat dissipation material to which 30 wt% of carbon nanotubes (CNT) and 70 wt% of aluminum powder are added in the stirring step (S10).

Comparative Example 1 is a heat dissipation material made of a heat dissipation material to which 100 weight% of aluminum powder is added without adding carbon nanotubes (CNT) in the stirring step (S10).

Comparative Example 2 is a heat dissipation material made of a heat dissipation material to which 40 wt% of carbon nanotubes (CNT) and 60 wt% of aluminum powder are added in the stirring step (S10).

12 is a SEM (Scanning Electron Microscope) photograph showing the surfaces of Example 1 and Comparative Examples 1 and 2 measured by FESEM (Field Emission Scanning Electron Microscope) surface analysis.

In Comparative Example 1, only aluminum powder was added without addition of carbon nanotubes (CNT) in the stirring step (S10). Thus, as shown in Fig. 12 (a) .

In Example 1, 20 wt% of carbon nanotubes (CNT) and 80 wt% of aluminum are added in the stirring step (S10), so that 20 wt% of carbon nanotubes (CNT) As shown in FIG. 12 (c), more voids are generated on the fracture surface, and the voids are generated in the fracture surface as shown in FIG. 12 (c). In Comparative Example 2, 40% by weight of carbon nanotubes .

In this case, the voids are formed when the binder is ignited and the PEG is volatilized when the heat dissipation material sample is made by applying heat after manufacturing the carbon nanotube heat dissipation material.

That is, as the content of the carbon nanotubes (CNT) increases, the pores become more active and the heat emission efficiency increases.

12 (b) and 12 (c), as the content of carbon nanotubes (CNTs) increases, the number of carbon nanotubes (CNTs) bonded to the aluminum powder on the surface of the heat radiator increases, It can be seen that the dispersion of the nanotubes (CNTs) is uniform.

13 is a graph showing the XRD pattern results of Examples 1 and 2 and Comparative Example 1. Fig.

Referring to FIG. 13, the carbon nanotube heat-resistant material of the present invention exhibits crystallization at 2 = 26.50 and 54.60 and crystallization at 2 = 26.50. As the content of carbon nanotubes (CNT) increases, It is confirmed that the intensity of the crystallization peak of the tube heat dissipating material is reduced.

In particular, when carbon nanotube (CNT) is contained in an amount of 30 wt% or more, the strength of the main peak is reduced to the greatest extent, and the content of the carbon nanotube (CNT) influences the intensity of the peak. Shows that as the content of carbon nanotube (CNT) increases, the intensity of the peak of the heat dissipating material decreases.

That is, as shown in FIGS. 12 and 13, the content of carbon nanotubes (CNTs) affects the microstructure, microvoids and crystallization of the carbon nanotube heat dissipation material.

14 is a graph showing structural analysis by FT-IR of Examples 1 and 2 and Comparative Example 3. Fig.

Referring to FIG. 14, the carbon nanotube heat-radiating material exhibits a strength at a similar peak regardless of the content of carbon nanotubes (CNTs).

및 3,450

의 피크는 각각 전형적인 C H기 및 OH기를 나타내고, 1,758

및 1,200

의 피크는 C = O 결합 및 아세틸(acetyl)의 피크를 각각 나타낸다.In addition, 2,937 carbon nanotubes

And 3,450

≪ / RTI > represent typical CH and OH groups, respectively, and 1,758

And 1,200

The peak of C = O bond and the peak of acetyl, respectively.

, 1,369

, 1,446

등의 피크는 탄소나노튜브(CNT)의 함유량에 따라 증가하는 것을 확인 할 수 있다.Further, in the FT-IR spectrum, 1,266

, 1,369

, 1,446

And the like increase with the content of carbon nanotubes (CNTs).

That is, the peak of the heat dissipation material is determined by the intrinsic peak of the carbon nanotube (CNT), and consequently the binding of the carbon nanotubes (CNT) contained in the carbon nanotube heat dissipation material is increased.

FIG. 15 is a graph showing the thermal conductivities of Examples 1 and 2 and Comparative Example 3, and FIG. 16 is a graph showing the results of measuring the temperature for 2 hours during which light is emitted by mounting the LED lamps of Examples 1 and 2 and Comparative Example 2 FIG. 17A shows the heat dissipation characteristics of a heat dissipater using a conventional aluminum material, and FIG. 17B shows heat dissipation characteristics of a heat dissipater using the carbon nanotube heat dissipation material of the present invention.

Referring to FIG. 15, it can be seen that as the content of carbon nanotubes (CNT) increases, the thermal conductivity of the carbon nanotube heat-radiating material increases. That is, it can be seen that the thermal conductivity of the carbon nanotube heat-radiating material is improved by the characteristics of the carbon nanotube (CNT) having excellent thermal conductivity.

Since the carbon nanotube (CNT) has a thermal conductivity value of about 3,000 W / m.k or less, the thermal conductivity of the carbon nanotube heat-radiating material can be improved, and the thermal conductivity can be improved by controlling the content with the aluminum powder.

Referring to FIG. 16, the initial temperature measured in the heat discharger of Examples 1 and 2 and Comparative Examples 1 and 2 is 27 ° C., but the temperature increases due to the heat generated from the LED lamp as time elapses .

It can be confirmed that Comparative Example 1 in which carbon nanotubes (CNTs) were not added after 1 hour in this state was overheated to 72 ° C or more.

However, in Examples 1 and 2 and Comparative Example 2 in which carbon nanotubes (CNTs) were added, it was confirmed that the temperature range for 2 hours was measured to be less than 70 ° C, and the heat emission efficiency was improved.

That is, as shown in FIGS. 17 (a) and 17 (b), the present invention includes a carbon composite material having excellent thermal conductivity, so that the heat dissipation rate and the heat dissipation efficiency can be significantly increased have.

As described above, the heat dissipating frame 1 according to an embodiment of the present invention can be manufactured by replacing the material of the heat dissipating body 5 or the heat dissipating assembly 7 with the conventional heat dissipation material of carbon nanotube instead of aluminum, Can be significantly increased.

The heat dissipating frame 1 of the present invention has guide grooves 51 on the outer surface of the heat dissipating body 5 so that the heat dissipating assemblies 7 are slidably attached to the guide grooves 51, The disassembly can be easily performed, and the equipment can be easily checked and replaced.

The heat dissipating frame 1 of the present invention is constructed such that the heat dissipating assemblies 7 attached to the heat dissipating body 5 are composed of a first heat dissipating assembly 710 having an off-white color of aluminum and a second heat dissipating assembly 710 having a black band of carbon nanotube heat dissipating platoon The first and second heat dissipating assemblies 710 and 720 are alternately arranged on the outer surface of the heat dissipating body 5 so that the aesthetics, The effect can be enhanced and the design effect can be maximized.

The heat dissipating frame 1 of the present invention is formed such that the first and second mating plates 711 and 711 'of the heat dissipating assembly 7 to be housed in the LED substrate 9 are separated from each other by the curved portion 713 Heat exchange can be performed more actively and the heat radiation efficiency can be further increased.

The heat dissipating frame 1 of the present invention is formed by forming a thread 7131 on the inner circumferential surface of the lower end of the curved portion 713 of the heat dissipating assembly 7 to be accommodated in the heat dissipating plate 31 of the heat dissipating plate 3 during assembly, The heat dissipating assembly 7 can be firmly coupled to the heat dissipating body 5 and the heat dissipating plate 3 by forming the bolt holes 313 in the heat dissipating plate 31 at the corresponding position, It is exposed to the surface of the heat sink 31 opposite to the mating surface 310 so that bolt fastening and disassembly can be easily performed.

In addition, the heat dissipation frame 1 of the present invention is formed by crushing and mixing the carbon composite material and the metal powder having high thermal conductivity with fine particles through the primary ball milling step and the secondary ball milling step in manufacturing the carbon nanotube heat dissipation material, It is possible to reduce the volume and volume of the carbon composite material, which leads to a reduction in production cost, and a reduction in production cost.

1: Carbon nanotube heat radiating frame 3: Heat radiating plate 5: Heat radiating body
7: heat dissipating assembly 9: LED substrate 31: heat sink
33: vertical portion 35: radiating fin 51: guide groove
53: curved portion 55: air moving hole 71: substrate contacting portion
73: support portion 75: sliding portion 77: heat dissipating blade
310: Facing surface 311: Through hole 313: Bolt hole
315: insertion hole 511: bottom surface 513, 513 ': vertical surface
515, 515 ': engagement jaws 711, 711': first and second treatment plates
713: curved portion 715, 715 ': inclined plate 731:

Claims (10)

An LED lighting device comprising LED substrates on which LED modules are mounted, and a heat dissipation frame for dissipating heat generated by the LED modules, the LED lighting device comprising:
The heat-
A heat dissipation plate including a disk-shaped heat dissipation plate having a through hole at the center thereof;
A heat dissipating body formed in a cylindrical shape having an upper and a lower portion opened and having an air movement hole formed therein and installed perpendicularly to a mating surface which is one surface of the heat dissipating plate;
And heat radiation assemblies detachably coupled to the outer surface of the heat dissipating body at intervals along an arc, wherein the heat dissipation assemblies are mounted on the heat dissipation body,
At least one of the heat dissipation assemblies is a material of a carbon nanotube heat dissipation material,
The manufacturing method of the carbon nanotube heat-
Agitation step of agitating 70 to 90% by weight of the metal powder and 10 to 30% by weight of the carbon composite material;
A ball milling step of mixing the metal powder and the carbon composite material stirred by the stirring step with an organic solvent and ball milling the mixture;
And a heat treatment and dispersion step of mixing a crushed material crushed with fine particles by the ball milling step with polyethylene glycol (PEG, polyethylene glycol) and a polyester binder, and blending the mixed mixture while heating and,
The ball milling step
The metal powder and the carbon composite material stirred by the stirring step are supplied into a ball mill jar containing balls and then rotated at a speed of 200 to 250 rpm to thereby first crush the metal powder and the carbon composite material A primary ball milling step;
And a second ball milling step of secondarily crushing the crushed material by the primary ball milling step at a speed of 200 to 250 rpm using balls having a diameter smaller than that of the ball used in the primary ball milling step ,
The primary ball milling step and the secondary ball milling step are performed by mixing 15 to 20 wt% of a mixture of a metal powder and a carbon composite material and 80 to 85 wt% of an organic solvent,
Wherein the ball milling step includes adding 1.5 to 2.5 wt% of stearic acid to the dispersion to promote the dispersion of the carbon composite material. The heat dissipating body according to claim 1, wherein the heat dissipating body further includes guide grooves formed inward from the outer side surface and extending in the height direction,
The heat-
The receiving plate;
A plate-shaped support portion vertically connected to one surface of the mounter plate;
Further comprising an insertion portion vertically connected to an end portion of the support portion and slidably inserted into a corresponding guide groove. [3] The apparatus according to claim 2, wherein the accommodating plates comprise a first accommodating plate and a second accommodating plate spaced apart from each other,
The heat-
A curved portion formed in a U-shape in cross section and having both ends connected to the ends of the first and second accommodating plates, respectively;
Further comprising inclined plates provided on the outer ends of the first and second accommodating plates opposite to the end portions connected to the curved portion. The heat dissipating body according to claim 3, wherein the heat dissipating assemblies are inserted into the guide grooves of the heat dissipating body,
Wherein the heat dissipation assemblies are threaded on an inner circumferential surface of the curved portion adjacent to an end portion of the heat dissipating assembly,
Wherein the heat sink is formed with bolt holes spaced along an arc around the through hole,
And the heat dissipation assemblies are coupled to the heat sink through bolt fastening. [6] The heat sink as claimed in claim 4, wherein the heat radiating plate has insertion holes penetrating through both sides of the through hole and the bolt holes,
Wherein the heat dissipation assemblies further include an escape preventing protrusion protruding from an end surface of the support portion,
Wherein the heat dissipation assemblies are inserted into the insertion holes of the heat dissipation plate when the heat dissipation assemblies are coupled to the heat dissipation plate to prevent vibration and vibration of the heat dissipation assemblies. delete The method according to any one of claims 1 to 5, wherein the heat treatment and dispersion step
The polyethylene glycol (PEG) is rotated at a speed of 50 to 70 rpm for a predetermined time and heated, and the crushed product and the polyester-based binder are mixed with heated polyethylene glycol (PEG), and then the mixed mixture is rotated And at the same time,
Wherein the heating temperature of the heat treatment and dispersion step is a melting point of the polyethylene glycol (PEG), the volume fraction of the polyethylene glycol (PEG) and the metal powder is 4, and the volume fraction of the carbon composite material-PEG precursor is 6 LED lighting device. The method of claim 7, wherein the primary ball milling step comprises: performing the process for one hour period, then stopping the process for 30 minutes, repeating the process performed for one hour period four times, Wherein the milling process is performed for 3 to 5 hours. The carbon composite material according to claim 8, wherein the carbon composite material is a single-walled carbon nanotube (SWCNT), a double-walled carbon nanotube (DWCNT), a multiwall carbon nanotube (MWCNT) -walled carbon nanotubes, rope carbon nanotubes, or combinations thereof,
Wherein the polyethylene glycol (PEG) in the heat treatment and dispersion step has a molecular weight of 15,000 to 20,000 MW. [7] The method of claim 7, wherein the heat dissipation assemblies comprise a first heat dissipation assembly made of aluminum and a second heat dissipation assembly made of the carbon nanotube heat dissipation material,
Wherein the heat dissipating assemblies are alternately installed in a crossing manner when the heat dissipating assemblies are attached to the heat dissipating body.

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