Abstract:
An LED lighting lifting system includes a lifting device installed at the ceiling of a building to move a lifting body upwards or downwards by using a wire; and an LED lighting connected to a lower end of the lifting body and moving downwards to the ground or upwards to the ceiling together with the lifting body. A cooling device is installed between the lifting body and the LED lighting to prevent the LED lighting from being broken due to a high temperature generated when a current over a rated current flows at the LED lighting.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application claims priority to Korean Patent Application No. 10-2011-0006178 filed in the Republic of Korea on Jan. 21, 2011, and PCT Application No. PCT/KR2012/000562 filed on Jan. 20, 2012, the disclosures of which are incorporated herein by reference. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a cooling device of an LED lighting lifting system, and more particularly, to a cooling device of an LED lighting lifting system, which is provided at an LED lighting, installed at the ceiling of a building to move upwards or downwards by a lifting device, to cool the heat generated from the LED lighting so that the LED lighting may be efficiently used and surrounding products may have improved durability. 
       BACKGROUND 
       [0003]    Generally, a highly-mounted lighting is installed at a hotel lobby, a factory, a church, a theater, a welling hall, a banquet hall, an oil station, a restaurant, a coffee shop, a department store or the like, which have a high ceiling. The highly-mounted lighting has no serious problem at its initial use, but, lightings should be periodically recycled due to the limited life span, exchanged due to the failure or periodically cleaned to extend their life span. 
         [0004]    In order to exchange or clean the highly-mounted lighting installed at a high ceiling, high place equipment such as a tower wagon, a tower crane or a ladder truck such be separately used. 
         [0005]    Such a high place work is much more inconvenient and demands high-level workmanship in comparison to the work on the ground. In particular, during a high place work, workers are always exposed to accidents such as an electric shock or falling. In addition, the use of high place equipment increases costs, which lays a burden in an economic aspect. 
         [0006]    Therefore, in view of the above drawbacks, a lighting lifting device for allowing light bulbs of a highly-mounted lighting to be safely and conveniently exchanged or cleaned on the ground has been recently developed. 
         [0007]    In brief, the lighting lifting device includes a lifting device installed or fixed to the ceiling of a building to move a lifting body upwards or downwards by using a wire, a lighting connected to the lower end of the lifting body to move downwards to the ground or upwards to the ceiling together with the lifting body, and a remote controller wirelessly communicating with the lifting device bidirectionally and allowing a ascending signal or a descending signal to be input to the lifting device at the ground. 
         [0008]    If the lighting lifting device configured as above is used, the lighting may be safely moved to the ground and then exchanged or cleaned. 
         [0009]    However, such a general lighting has low energy efficiency. In this regard, a lighting device using a light emitting diode (LED) has higher energy efficiency in comparison to other lighting devices such as a fluorescent lamp, a mercury lamp or an incandescent lamp and does not discharge contaminants while ensuring a long life span. Therefore, general lightings are substituted with LED lightings in these days. 
         [0010]    In the lighting device using an LED lighting as described above, if a rated current flows at the LED lighting, the lighting device generally maintains about 60° C. However, if a current over the rated current flows, the LED lighting may be easily broken due to a high temperature. When a current flows at the LED lighting, both ends of the LED lighting basically have a constant voltage characteristic, but if the current increases, the voltage also increases very finely. In addition, if the current increases over a predetermined limit, the caloric value rapidly increases, and the LED lighting is broken due to the overheat. Moreover, the high temperature generated when the lighting turns on may seriously deteriorate surrounding products. 
       SUMMARY 
       [0011]    The present invention is directed to providing a cooling device of an LED lighting lifting system, which is provided at an LED lighting, installed at the ceiling of a building to move upwards or downwards by a lifting device, to cool the heat generated from the LED lighting so that the LED lighting may be efficiently used and surrounding products may have improved durability. 
         [0012]    In one aspect of at least one embodiment of the present invention, there is provided a cooling device of a light emitting diode (LED) lighting lifting system including a lifting device installed at the ceiling of a building to move a lifting body upwards or downwards by using a wire; and an LED lighting connected to a lower end of the lifting body and moving downwards to the ground or upwards to the ceiling together with the lifting body, wherein the cooling device is installed between the lifting body and the LED lighting to prevent the LED lighting from being broken due to a high temperature generated when a current over a rated current flows at the LED lighting. 
         [0013]    Preferably, the cooling device may include a cooling box having a rectangular box shape and integrally connected to the lifting device so that the LED lighting is installed at a lower end thereof; an inhaling cooling fan formed at one side of the cooling box to inhale an external fresh air; a discharging cooling fan located at a side opposite to the inhaling cooling fan and formed at the other side of the cooling box to forcibly discharge the heat generated from the LED lighting; a plurality of cooling pillars arranged in the cooling box with regular intervals in the vertical direction to absorb the heat generated from the LED lighting; a cooling cap coupled to an upper end of the cooling box so that the cooling box has a perfect rectangular box shape, the lifting body being fixed to an upper end thereof; and a plurality of discharging pillars formed at the same location as the cooling pillars formed in the cooling box and protruding outwards at the upper end of the cooling cap to discharge the heat absorbed by the cooling pillars to the outside, wherein when an ascending signal is input to the lifting device, the lifting body, the LED lighting and the cooling box simultaneously move upwards by the wire, and when the upward movement is completed, power is applied to the lifting device to turn on the LED lighting. 
         [0014]    In another aspect of at least one embodiment of the present invention, there is also provided an LED lighting lifting system having the above cooling device. 
         [0015]    As described above, according to at least one embodiment of the present invention, a cooling device is integrally provided to an LED lighting which moves upwards or downwards by means of a lifting device. 
         [0016]    Therefore, since the heat generated from the LED lighting is cooled by the cooling device, it is possible to prevent the LED lighting from being broken due to overheating, and therefore durability of surrounding products is improved. 
         [0017]    In particular, since the LED lighting lifting system according at least one embodiment of the present invention includes a cooling pillar for absorbing heat in a cooling box and discharges the heat absorbed by the cooling pillar to the outside by means of forced convection using a fan, the heat generated from the LED lighting may be efficiently cooled. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0018]      FIG. 1  is a perspective view showing a cooling device according to at least one embodiment of the present invention, which is installed between a lifting device and an LED lighting. 
           [0019]      FIG. 2  is an exploded perspective view showing the cooling device according to the at least one embodiment of present invention. 
       
    
    
     REFERENCE NUMERALS 
       [0020]      
         [0000]    
       
         
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 100: lifting device 
                 110: wire 
               
               
                   
                 120: lifting body 
                 200: LED lighting 
               
               
                   
                 300: cooling device 
                 310: inhaling cooling fan 
               
               
                   
                 310a: discharging cooling fan 
                 320: cooling box 
               
               
                   
                 330: cooling pillar 
                 340: cooling cap 
               
               
                   
                 350: discharging pillar 
               
               
                   
                   
               
             
          
         
       
     
       DETAILED DESCRIPTION 
       [0021]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
         [0022]    Prior to describing a cooling device of the present invention, the related art will be described. An LED lighting lifting system according to at least one embodiment of the present invention includes a lifting device  100  installed at the ceiling of a building to move a lifting body  120  upwards or downwards by using a wire  110 , and an LED lighting  200  connected to a lower end of the lifting body  120  and moving downwards to the ground or upwards to the ceiling together with the lifting body  120 . The lifting device  100  wirelessly communicates with a remote controller (not shown) bidirectionally. If an ascending signal or a descending signal is input to the lifting device  100  by using the remote controller, the lifting body  120  and the LED lighting  200  are operated to move upwards or downwards according to the ascending signal or the descending signal of the remote controller. The overall techniques of the lifting device are substantially well known in the art. 
         [0023]    First, the lifting device  100  winds or unwinds the wire  110  to move the lifting body  120  and the LED lighting  200  upwards or downwards, and the lifting device  100  makes wireless communication with the remote controller bidirectionally to control the ascending or descending movement. This configuration is well known in the art and not described in detail here. 
         [0024]    In order to effectively cool the heat generated from the LED lighting  200 , the LED lighting lifting system according to at least on embodiment of the present invention basically includes a cooling device  300  between the lifting body  120  and the LED lighting  200  as shown in  FIGS. 1 and 2 , so that the heat generated from the LED lighting  200  may be cooled by the cooling device  300 . 
         [0025]    The cooling device  300  includes a cooling box  320  having a rectangular box shape so that the LED lighting  200  is installed at a lower end thereof, an inhaling cooling fan  310  formed at one side of the cooling box  320  to inhale an external fresh air, a discharging cooling fan  310   a  located at a side opposite to the inhaling cooling fan  310  and formed at the other side of the cooling box  320  to forcibly discharge the heat generated from the LED lighting  200 , a plurality of cooling pillars  330  arranged in the cooling box  320  with regular intervals in the vertical direction to absorb the heat generated from the LED lighting  200 , a cooling cap  340  coupled to an upper end of the cooling box  320  so that the cooling box  320  has a perfect rectangular box shape, the lifting body  120  being fixed to an upper end thereof, and a plurality of discharging pillars  350  formed at the same location as the cooling pillars  330  formed in the cooling box  320  and protruding outwards at the upper end of the cooling cap  340  to discharge the heat absorbed by the cooling pillars  330  to the outside. 
         [0026]    When the inhaling cooling fan  310  and the discharging cooling fan  310   a  are installed to the cooling box  320 , the inhaling cooling fan  310  and the discharging cooling fan  310   a  may be formed at both sides of the cooling box  320 , respectively, so that an external air is inhaled and an inside air is discharged. For example, if the inhaling cooling fan  310  is formed at the front surface, the discharging cooling fan  310   a  is formed at the rear surface of the cooling box  320  so that the inside air may be forcibly discharged outwards 
         [0027]    In particular, since the cooling device  300  of the present invention is used for cooling the LED lighting  200 , the cooling device  300  may have a box shape with a sealed space. In this case, the cooling box  320  and the cooling cap  340  are coupled to configure a single cooling device  300 , the heat generated from the LED lighting  200  is collected in the cooling device  300 , and the collected heat is forcibly circulated by the inhaling cooling fan  310  and the discharging cooling fan  310   a . During the forced circulation, the heat generated from the LED lighting  200  is more effectively cooled by the cooling pillar  330  and the discharging pillar  350 . In other words, the heat generated from the LED lighting  200  is discharged out by means of forced convection, rather than natural convection. 
         [0028]    In order to use the present invention configured as above, the cooling box  320  in which the plurality of cooling pillars  330  are arranged in the vertical direction and the cooling cap  340  having the plurality of discharging pillars  350  at the upper end thereof are prepared. Here, the inhaling cooling fan  310  and the discharging cooling fan  310   a  are installed at the front surface and the rear surface of the cooling box  320 , respectively. After that, the cooling cap  340  is connected to the lifting body  120 , and the cooling box  320  is coupled to the LED lighting  200 . In this case, the cooling device  300  having a box shape is integrally connected to the lifting device  100 . 
         [0029]    If an ascending signal is input to the lifting device  100  by using a remote controller, the lifting body  120 , the LED lighting  200  and the cooling box  300  of the lifting device  100  simultaneously move upwards by means of the wire  110 . If the ascending movement is completed, power is applied to the lifting device  100  to turn on the LED lighting  200 . 
         [0030]    In the above state, if the LED lighting  200  is used for a long time, the LED lighting  200  is overheated to generate high-temperature heat. At this time, the cooling pillar  330  absorbs the high-temperature heat, and the absorbed heat is discharged to the outside via the cooling pillars  330  through the discharging pillars  350 . 
         [0031]    In addition, the inhaling cooling fan  310  formed at one side of the cooling box  320  inhales an external cool air to the inside to decrease the overall inside temperature of the cooling box  320 . The air mixed with the internal high-temperature heat is discharged out through the discharging cooling fan  310   a . This external air inhaling process and the internal hot air discharging process continuously repeat, which allows the high-temperature heat generated from the LED lighting  200  to be easily cooled.