KR101228757B1 - Led lighting devices with dual cooling structure - Google Patents

Abstract

PURPOSE: An LED(Light Emitting Diode) lighting device having a dual cooling structure is provided to discharge heat generated in an LED by passing outer air through a cooling fan, the inside of a lighting device, and the LED. CONSTITUTION: A case(100) includes a cooling fan(130) for pulling outer air to an internal space and plural air vents formed on a wall facing the cooling fan. A radiator(200) includes air inducing grooves(210,210') of plural lines formed in a progress direction of air. Heat pipe heat transfer pins(300,300') of plural lines are vertically installed between the grooves. Aluminum cooling pins(400,400') of plural lines include plural air hollow holes(410). A cover body(500) includes LED withdrawal holes(510,510').

Description

LED lighting devices with dual cooling structure

The present invention relates to an LED lighting device having a cooling structure, and more particularly, by directly cooling the LED element, and implementing a dual cooling method using a heat sink and a heat pipe heat transfer fin and a cooling fin, thereby generating heat generated in the LED element. The present invention relates to an LED lighting device having a dual cooling structure that can improve cooling efficiency such as heat dissipation more quickly and stably, and thereby lead to stable driving and prolongation of life of the LED lighting device.

In general, a light emitting diode (LED) is a device that bonds a p-type semiconductor and an n-type semiconductor, and emits light while electrons and holes are bonded at a bonding surface. Such LEDs generate high luminance due to low power consumption and are environmentally friendly because no harmful substances such as mercury are used, and have been recently used as various lighting devices due to their excellent lifetime and durability.

However, since LED is basically a semiconductor, it is not only very vulnerable to heat, and in order to use the LED as a lighting device, it is necessary to obtain sufficient illuminance.

As such, the amount of LED emitted by light is about 20% of the input energy, and the remaining 80% is emitted by heat. LEDs for lighting use high currents to achieve high optical power, and heat is generated accordingly, so thermal considerations are particularly important.

In other words, if the heat generated from the LED device is not discharged to the outside, it stays inside the LED light source module, so that the LED chip or the printed circuit board (PCB) for a long time is maintained at a substantially high temperature. If the LED device is driven for a long time without proper heat dissipation, the LED chip or PCB will be degraded, and the electrical and optical characteristics will be deteriorated. In addition, severe overload failures can cause serious damage to the LED elements themselves.

Therefore, it is necessary to be able to quickly discharge the heat generated from the LED device to the outside. In particular, when the LED element is used as a light source for indoor or outdoor lighting devices, a large number of LED elements are arranged in a small area so that the heat generated from the LED chip element can be radiated to the surrounding space. Is more important than anything.

On the other hand, the conventional LED lighting device for dissipating heat generated by the LED device as described above, as the heat sink is coupled to the upper surface of the PCB coupled to a plurality of LED devices, such as Patent No. 10-1153291 in the LED device The heat generated in the heat can be radiated to the air through the heat sink to cool the LED element. The heat absorbed by the heat sink is formed by the expansion of the air contact area by the discharge pin constituting the heat sink. The air that is in contact with is also due to convection, a natural phenomenon of air generated by heat generated from heat sinks.

However, the cooling structure of the natural air circulation type as described above has a very slow heat dissipation rate and a very small amount of heat radiated. Thus, a minimum cooling effect can be obtained. However, when a lighting device is used for a long time, the LED element is overheated due to a heat storage phenomenon. As a result, the error of the lighting device and the shortening of the lifespan of the LED device appeared.

The present invention has been made to solve the above problems, forcing the air to flow by the cooling fan, the air flows between each LED element to dissipate the heat generated by the LED element, at the same time a large number Metal boards with LED elements are installed in close contact with heat sinks with multiple heat pipe heat transfer fins and cooling fins, thereby rapidly transferring and diffusing heat generated from the metal boards, thereby significantly improving cooling efficiency and consequently LEDs. SUMMARY OF THE INVENTION An object of the present invention is to provide an LED lighting device having a dual cooling structure that can bring about stable driving and an extended life of the device and the lighting device.

As a specific means for achieving the above object, the control unit for controlling the lighting device therein is a case on the bottom open type housing having an inner portion and a space portion, and a plurality of LED lighting is installed on the metal board coupled to the case In the device,

A case in which a cooling fan for forcibly introducing external air into the inner space is formed on one side, and a plurality of air outlets are formed on a wall surface facing the cooling fan;

The lower opening of the case is closed, and a plurality of rows of air guide grooves are formed in an upward direction of the air on the upper side, and a recessed board mounting groove is formed on the bottom surface and the metal board having LED elements is mounted on the board mounting groove. Heat sink;

A plurality of heat pipe heat transfer fins vertically placed between the air guide grooves in the same direction as the air guide grooves at the top of the heat sink;

A plurality of rows of aluminum cooling fins fitted at right angles from the top of the heat pipe heat transfer fins, each having a plurality of air through holes; And

Finishing the board mounting groove of the heat sink and can be achieved by including a cover body formed with a plurality of LED device draw holes so that each LED device is exposed to the outside.

In the LED lighting device having a dual cooling structure of the present invention as described above, the outside air is introduced into the lighting device by the cooling fan and the air introduced therethrough passes between the LED elements, so that the heat generated from the LED elements is reduced. It can be quickly absorbed by the air and radiate to the outside.

In addition, the metal board with a plurality of LED elements is installed in close contact with the heat sink having a plurality of heat pipe heat transfer fins and cooling fins, so that the heat generated from the metal board is evenly spread and absorbed by the heat sink and heat pipe heat transfer fins and cooling fins quickly. The cooling efficiency is greatly improved by the dual cooling method such as absorbing heat and radiating heat to the outside while the air flowed through the operation of the cooling fan is rapidly increased, thereby stably driving the lighting device and extending the life of the lighting device. You will get the effect.

1 is an exploded perspective view of an LED lighting device having a dual cooling structure of the present invention.
Figure 2 is a bottom perspective view of the combined state of the LED lighting device having a dual cooling structure of the present invention.
Figure 3 is a combined cross-sectional view of the LED lighting device having a dual cooling structure of the present invention.
Figure 4 is a perspective view of the heat sink of the LED lighting device having a dual cooling structure of the present invention.
5 is a plan view of the heat sink of the LED lighting device having a dual cooling structure of the present invention.
Figure 6 is a bottom view of the heat sink of the LED lighting device having a dual cooling structure of the present invention.
Figure 7 is a LED device cooling operation state diagram of the LED lighting device having a dual cooling structure of the present invention.
8 is a metal board and internal device cooling operation state diagram of the LED lighting device having a dual cooling structure of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

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

1 is an exploded perspective view of an LED lighting device having a dual cooling structure of the present invention, FIG. 2 is a combined perspective view of an LED lighting device having a dual cooling structure of the present invention, and FIG. 3 is a perspective view of an LED lighting device having a dual cooling structure of the present invention. 4 is a perspective view of a heat sink of the LED lighting apparatus having the dual cooling structure of the present invention, FIG. 5 is a plan view of the heat sink of the LED lighting apparatus having the dual cooling structure of the present invention, and FIG. 6 is a double cooling structure of the present invention. Bottom view of heat sink of LED lighting device.

As shown in FIGS. 1 to 6, the LED lighting device 1 having the dual cooling structure of the present invention includes a case 100 constituting the lighting device body, a heat sink 200 coupled to the case 100, and a heat. The pipe heat transfer fins 300, 300 ′, the cooling fins 400, 400 ′, and the heat sink 200 cover the cover body 500.

Here, the case 100, the lower portion is open, is formed of a rectangular enclosure made of a metal material in which the space portion 120 is formed therein, the space portion 120 is a control unit to control the lighting device as a whole ( 110) is formed.

In addition, at least one cooling fan 130 is formed on one side wall of the case 100 to force external air into the case 100, and the heat dissipated at the other side wall facing the cooling fan 130. A plurality of grille-type air outlets 140 are formed to allow air to be discharged to the outside of the case 100.

The heat dissipation plate 200 is formed in a plate shape having a predetermined thickness of an aluminum material which is coupled to the lower opening of the case 100 and closes the space part 120 in the case. In the cooling fan 130, a plurality of rows of air guide grooves 210, 210 'having a length in the direction of the air outlet 140 is formed, the bottom surface is formed with a board mounting groove 220 is formed, The metal board 10 in which a plurality of conventional LED elements 11, 11 ′ are arranged in the board mounting groove 220 is mounted and accommodated closely so as to evenly absorb heat generated from the metal board 10. .

In addition, the heat sink 200 is formed in the air inlet hole 230 in communication with the board mounting groove 220 of the bottom in the air guide grooves 210 and 210 ′ in the vicinity of the cooling fan 130, In each of the air induction grooves 210 and 210 'opposite to and opposite to the air inlet hole 230, air discharge holes 240 and 240' communicating with the board mounting groove 220 are respectively. And a portion of the air introduced into the case 100 by the cooling fan 130 is introduced into the board mounting groove 220 through the air inlet hole 230 and into the air outlet holes 240 and 240 '. It is configured to have an exhausting air flow structure.

The heat pipe heat transfer fins 300 and 300 ′ form a plurality of rows in the same direction as the air induction grooves 210 and 210 ′ on an upper portion of the heat sink 200, and the air induction grooves 210. It is preferable to use a copper or aluminum material having excellent thermal conductivity for the heat pipe heat transfer fins 300 and 300 ', which are vertically interposed between 210' and the distilled water or liquid nitrogen. The heat pipes filled with the heat conductive fillers may be used by adopting the heat transfer fins 300 and 300 ', and are configured to quickly absorb heat from the heat sink 200.

The cooling fins 400 and 400 ′ are made of an aluminum material having excellent thermal conductivity, and the heat pipe heat transfer fins 300 of each row in a direction perpendicular to an upper portion of the heat pipe heat transfer fins 300 and 300 ′ ( 300 ') is coupled to be coupled to each other, and is configured to form a lattice shape with the heat pipe heat transfer fins 300, 300' at the time of coupling to absorb and release heat from the heat pipe heat transfer fins 300, 300 '. will be.

At this time, each of the cooling fins 400, 400 'is formed with a plurality of air through holes 410 to increase the contact area at the same time as the air passes through the heat pipe heat transfer fins 300, 300' A plurality of lower open fitting grooves 420 are formed at positions corresponding thereto.

Here, the fitting groove 420 is configured to have a width gradually narrowed toward the top, the cooling fins 400, 400 'is fitted when fitted to the heat pipe heat transfer fins 300, 300'. Induction and interference of the bite coupling by the groove 420 is to increase the adhesion to the heat pipe heat transfer fins (300, 300 ').

Meanwhile, the heat pipe heat transfer fins 300, 300 ′ and cooling fins 400, 400 ′ are configured to be fixed and supported by the first, second, and third fixing brackets 250, 260, 270. The first fixing bracket 250 is formed of a thin plate, the lower end of which is coupled to the upper part of the heat sink 200 at one end of the heat pipe heat transfer fins 300 and 300 ', and the upper part is bent and A plurality of heat transfer fin fixing grooves 251 are formed at the bent portion, and the ends of the heat pipe heat transfer fins 300 and 300 'are fitted and fixed.

In addition, the second fixing bracket 260 is made of a thin plate, the lower end is coupled to the upper portion of the heat sink 200 at one end of the cooling fins 400, 400 ', the upper portion is bent and its A plurality of cooling fin fixing grooves 261 are formed in the bent portion so that the ends of the cooling fins 400 and 400 'are fitted and fixed.

In addition, the third fixing bracket 270, which is composed of a thin plate, the lower side is coupled to the upper portion of the heat sink 200 on the opposite side of the second fixing bracket 260, the upper portion is bent to the pressing jaw 271 ) Is formed, and the upper end of the cooling fins 400, 400 'by the pressing jaw 271 is configured to be fixed.

The cover body 500 is formed of a thin plate for finishing the board mounting groove 220 on the bottom surface of the heat sink 200, each LED element (11) (11 ') of the cover body 500 to the outside A plurality of LED device drawing holes 510 and 510 'are formed to be exposed.

In addition, when the board mounting groove 220 is closed by the cover body 500, an air movement path 280 communicating between each of the LED elements 11 and 11 ′ is secured between the board mounting groove 220. Will be.

Hereinafter, the operation of the LED lighting device having a dual cooling structure of the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

LED lighting device (1) having a dual cooling structure according to an embodiment of the present invention, the heat radiation of the LED element that directly generates heat, and indirectly generated heat dissipation inside the metal board and case that generates heat at the same time To improve the cooling efficiency and significantly improve the life of the LED device and lighting device.

Thus, referring to the illustration of Figures 7 and 8 Looking at the heat dissipation operation state of the LED lighting device 1 having a dual cooling structure of the present invention,

When heat is generated in the LED elements 11 and 11 ′ due to the lighting of the LED lighting apparatus 1 for a long time, the operation of the cooling fan 130 formed in the case 100 is performed.

Therefore, when the external cool air is introduced into the case 100 by the operation of the cooling fan 130, the introduced air is distributed and supplied to the bottom of the space part 120 and the heat sink 200 of the case 100. will be.

First, Figure 7 is a diagram showing the LED element cooling operation state of the LED lighting device having a dual cooling structure of the present invention, as shown in Figure 7 cool outside air flows into the inner space portion 120 of the case 100 and at the same time Through the air inlet hole 230 formed in the heat sink 200 is to enter the air movement path 280 formed in the board mounting groove 220 on the bottom.

The entered air then comes into contact with the heated LED elements 11 (11 ') and cool air and the LED elements 11 while passing through the air movement path 280 between each LED element 11, 11'. Heat exchange between the heat sinks 11 ', and thus, the temperature of the LED elements 11 and 11' that are released into the air becomes relatively low, and absorbs heat from the LED elements 11 and 11 '. The air temperature is a cooling of the LED elements 11 and 11 'through a heat exchange process that is relatively increased.

Thereafter, the heat exchanged hot air is discharged to the air guide grooves 210 and 210 'on the heat sink 200 through the air discharge holes 240 and 240', and the air outlet 140 of the case 100 is opened. Is discharged to the outside through the heat dissipation of the LED element (11) (11 ') is made.

FIG. 8 is a view illustrating a metal board and an internal device cooling operation state of the LED lighting apparatus having the dual cooling structure according to the present invention. As shown in FIG. 11) 11 'is directly transferred to the metal board 10 is installed, the heat is transferred to the control unit 110 including the metal board 10 and the space portion 120 inside the case 100. In order to prevent this, the heat generated from the metal board 10 in the heat sink 200, the heat pipe heat transfer fins 300, 300 'and the cooling fins 400, 400' provided with the metal board 10 is installed. It will be absorbed and released to the outside.

In detail, when the external cool air is introduced into the case 100 by the operation of the cooling fan 130, the introduced air is provided in the space part 120 by the heat sink 200 and the heat pipe heat transfer fin 300 ( 300 'and the cooling fins 400 and 400' are in contact with each other.

That is, the cold air is made of heat exchange to absorb the hot heat of the heat sink 200 while contacting the heat sink 200 while passing through the air guide grooves 210 and 210 ′ formed on the top surface of the heat sink 200. In addition, the temperature of the heat sink 200 is relatively low and the temperature of the air is relatively increased, such that the heat sink 200 is cooled through a heat exchange process.

In addition, the cold air is to be in contact with the heat pipe heat transfer fins 300, 300 'and the cooling fins 400, 400', the cold air is air induction grooves 210, 210 'and the cooling fins 400 Heat exchange to absorb hot heat by contacting the heat pipe heat transfer fins 300, 300 'and the cooling fins 400, 400' while passing through the air through hole 410 of the (400 '), heat Temperature of the pipe heat transfer fins 300, 300 'and the cooling fins 400, 400' is relatively low and the temperature of the air is relatively increased. And cooling fins 400 and 400 'are made.

That is, the heat generated continuously from the metal board 10 is to be transmitted and discharged to the heat sink 200, the heat pipe heat transfer fins 300, 300 'and the cooling fins 400, 400', and is released The hot air is discharged to the outside through the air outlet 140 of the case 100, and the heat radiation effect is improved by repeating the flow of air as described above.

Meanwhile, the air guide grooves 210 and 210 'formed in the heat sink 200 and the air through holes 410 formed in the cooling fins 400 and 400' improve the contact area with air to induce rapid cooling. It can be.

As described above, the LED lighting device having the dual cooling structure of the present invention, by direct heat dissipation of the LED element, and the heat transmitted to the inside of the lighting device through the metal board at the same time, the heat dissipation is improved to improve the cooling efficiency and stable driving of the lighting device and its It is possible to extend the service life significantly.

10: metal board 11,11 ': LED element
100: case 110: control unit
120: space 130: cooling fan
140: air outlet
200: heat sink 210,210 ': air guide groove
220: board mounting groove 230: air inlet hole
240,240 ': Air outlet 250: First fixing bracket
251: heat transfer pin fixing groove 260: second fixing bracket
261: cooling pin fixing groove 270: third fixing bracket
271: pressure jaw 280: air movement path
300,300 ': Heat pipe heat transfer fin
400,400 ': Cooling fin 410: Air through
420: fitting groove
500: Cover body 510,510 ': LED element drawing hole

Claims (4)

The control unit 110 for controlling the lighting device therein is a case 100 on the lower open type enclosure in which the inner portion and the space portion 120 are formed, and a plurality of LEDs on the metal board 10 coupled to the case 100. In the LED lighting apparatus provided with the elements 11, 11 ',
Cooling fan 130 for forcibly introducing the outside air into the inner space portion 120 is formed on one side, a case having a plurality of air outlet 140 is formed on the wall facing the cooling fan 130 ( 100);
The lower opening of the case 100 is closed, and a plurality of rows of air guide grooves 210 and 210 'are formed in an upward direction of air, and a recessed board mounting groove 220 is formed at a bottom thereof and the board The heat dissipation plate 200 in which the metal board 10 having the LED elements 11 and 11 ′ is accommodated and mounted in the mounting groove 220;
A plurality of heat pipe heat transfer fins 300 arranged vertically between the air guide grooves 210 and 210 'in the same direction as the air guide grooves 210 and 210' in the upper portion of the heat sink 200 ( 300 ');
A plurality of rows of aluminum cooling fins 400 and 400 ′ which are fitted at right angles to the heat pipe heat transfer fins 300 and 300 ′ and each of which has a plurality of air through holes 410 formed therein; And
A cover body formed with a plurality of LED element outlet holes 510 and 510 ′ to finish the board mounting groove 220 of the heat sink 200 and to expose each of the LED elements 11 and 11 ′ to the outside. LED lighting device having a dual cooling structure, characterized in that it comprises a 500.
The method of claim 1,
The heat sink 200,
In the air guide grooves 210 and 210 ′ in the vicinity of the cooling fan 130, an air inlet hole 230 communicating with the board mounting groove 220 on the bottom is formed, and the air inlet hole 230 and Air induction grooves (210, 210 ') of the opposite side and the opposite side opposite to each other further formed air outlet holes 240, 240' in communication with the board mounting groove 220 of the bottom, respectively,
When the outside air flows into the inside by the operation of the cooling fan 130, the inflow into the board mounting groove 220 through the air inlet hole 230 of the heat sink 200 and each LED element 11, 11 ′ LED lighting device having a dual cooling structure, characterized in that configured to be discharged through the air discharge hole 240, 240 '.
The method of claim 1,
The cooling fins 400, 400 ',
In the lower portion of the heat pipe heat transfer fins (300, 300 ') to form a plurality of lower open fitting grooves 420,
The fitting groove 420 is configured to have a width that is gradually narrowed gradually toward the top, the cooling fins 400, 400 'of the bite coupling when fitting the heat pipe heat transfer fins 300, 300' LED lighting device having a dual cooling structure, characterized in that the induction and interference fitting is configured to increase the adhesion to the heat pipe heat transfer fins (300) (300 ').
The method of claim 1,
The heat pipe heat transfer fins (300, 300 ') and the cooling fins 400, 400' (400 ') for fixing the first, second, third fixing brackets (250, 260, 270) further comprises,
The first fixing bracket 250 has a lower portion coupled to and fixed to an upper portion of the heat sink 200 at one end of the heat pipe heat transfer fins 300 and 300 ', and the upper portion is bent and a plurality of heat transfer fin fixing grooves 251. It is formed and the ends of the heat pipe heat transfer fins 300, 300 'is fitted and fixed,
The second fixing bracket 260 has a lower portion coupled to and fixed to an upper portion of the heat sink 200 at one end of the cooling fins 400 and 400 ', and the upper portion is bent and a plurality of cooling fin fixing grooves 261 are formed. End of the cooling fins 400, 400 'is fitted and fixed,
The third fixing bracket 270, the other end of the cooling fins 400, 400 'is fixed to the lower portion coupled to the upper portion of the heat sink 200, the upper pressing jaw 271 is formed to be bent cooling fin 400 LED lighting device having a dual cooling structure, characterized in that configured to be fixed to the upper portion of the (400 ').

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