Patent Publication Number: US-11022295-B2

Title: Illumination device cooling module and cooling device including same

Description:
TECHNICAL FIELD 
     The present invention relates to a cooling module for illumination device and a cooling device including the same, and more particularly, to a cooling module for illumination device that radiates heat generated from an illumination part and a cooling device including the same. 
     BACKGROUND ART 
     Most of the power supplied to a LED light is converted into thermal energy, and accordingly, the increase of temperature causes the decrease of light output and the wavelength shift, and the lifetime is drastically reduced. 
     A heat pipe uses the principle that an evaporative liquid is injected into a closed pipe, evaporation of the liquid occurs, when one end of the pipe is heated, and condensation occurs at the other end of the pipe to dissipate heat. This can minimize the thermal resistance generated in a heat exchange and can increase a cooling effect even by a small temperature difference. 
     In addition, a device for increasing a cooling efficiency by combining a plurality of heat radiating plates with the heat pipe is also provided. 
     However, a cooling device for LED illumination according to the above related art is not able to induce a heat of high temperature to the outside of the cooling device smoothly, and thus the cooling efficiency is low. 
     Therefore, a method for solving such problems is required. 
     DISCLOSURE 
     Technical Problem 
     The present invention has been made in view of the above problems, and provides a cooling module which comprises a substrate, a heat pipe, and a heat radiating plate, when one side of the heat pipe inserted into the substrate is deflected toward the center of the substrate to increase a heat conductivity flowing from the substrate to the heat pipe. 
     The inner and outer fin parts of a second height portion are twisted at a relatively larger angle than the inner and outer fin parts of a first height portion so that the inner and outer fin parts of the first height portion promote heat radiation to the side, and the inner and outer fin parts of the second height portion promote heat radiation to the upper side. 
     By twisting the inner fin part at a relatively larger angle than the outer fin part, the outer fin part promotes heat radiation to the side, and the inner fin part promotes heat radiation in the upward tilting direction. 
     The problems of the present application are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description. 
     Technical Solution 
     In an aspect, there is provided a cooling module for illumination device, the cooling module including: a substrate contacting a heat-generating illumination part at a lower part thereof and having an insertion groove formed on the upper surface thereof; a heat pipe which radiates the heat generated from the illumination part and includes a horizontal part inserted into the insertion groove and a vertical part vertically bent from the horizontal part and extending in a longitudinal direction; and a heat radiating plate laminated on and coupled to the vertical part of the heat pipe to promote heat radiation of the heat pipe, and including a coupling part coupled to the heat pipe, an inner fin part cut inward from the coupling part and formed to be twisted by a predetermined angle, and an outer fin part cut outward from the coupling part and formed to be twisted by a predetermined angle. 
     The insertion groove and the horizontal part of the heat pipe are formed in a longitudinal direction toward a center of the substrate respectively, and have one side formed to be biased and inserted while progressing toward the center of the substrate. 
     The insertion groove and the horizontal part of the heat pipe are formed to be bent at least once. The inner and outer fin parts are divided into a first height portion having a predetermined height from a bottom and a second height portion having a height from the first height to a top, wherein the inner and outer fin parts of the second height portion are formed to be twisted by an angle relatively larger than the inner and outer fin parts of the first height portion, wherein the inner and outer fin parts of the first height portion promote heat radiation to a lateral side and the inner and outer fin parts of the second height portion promote heat radiation upward. The inner fin part is formed to be twisted by a relatively larger angle than the outer fin part, wherein the outer fin part promotes heat radiation to a lateral side and the inner fin part promotes heat radiation in an upward tilt direction. 
     The inner fin part comprises a first inner fin part adjacent to the coupling part and a second inner fin part extending from the first inner fin part, wherein the second inner fin part is formed to be twisted by a relatively larger angle than the first inner fin part, wherein the first inner fin part promotes heat radiation in an upward tilt direction and the second inner fin part promotes heat radiation upward. 
     In another aspect, there is provided a cooling device having a cooling module for illumination device, the cooling device including: the above mentioned cooling module; an illumination part attached to a lower portion of the cooling module; and a case which accommodates the cooling module and the illumination part, and has a vent hole. 
     The case further comprises a visor so as to control a path of light emitted from the illumination part. 
     Advantageous Effects 
     In order to solve the above-described problems, a cooling module for illumination device and a cooling device including the same have the following effects. 
     First, one side of the heat pipe is formed to be biased while progressing toward a center of the substrate, so that the thermal conductivity from the substrate to the heat pipe can be increased. 
     Second, the inner and outer fin parts of the second height portion are formed to be twisted by a relatively larger angle than the inner and outer fin parts of the first height portion, so that the inner and outer fin parts of the first height portion promote heat radiation to the lateral side, and the inner and outer fin parts of the second height portion promote heat radiation to the upper side. 
     Thirdly, the inner fin part is formed to be twisted by a relatively larger angle than the outer fin part, so that the outer fin part guides the inflow of the outside air to the lateral side and the inner fin part guides the inflow of the outside air in the upward tilt direction, thereby promoting heat radiation. 
     Fourthly, the second inner fin part is formed to be twisted by a relatively larger angle than the first inner fin part, so that the first inner fin part guides the flow of the introduced air in the upward tilt direction and the second inner fin part guides in the upward direction, thereby promoting heat radiation. 
     The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       The objects, features and advantages of the present invention will be more apparent from the following detailed description in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a view illustrating a cooling module according to a first embodiment of the present invention; 
         FIG. 2  is an exploded perspective view of a cooling module according to a first embodiment of the present invention; 
         FIG. 3  and  FIG. 4  are views showing a substrate and a heat pipe of a cooling module according to a first embodiment of the present invention; 
         FIG. 5  and  FIG. 6  are views showing a heat radiating plate of a cooling module according to a first embodiment of the present invention; and 
         FIG. 7  and  FIG. 8  are views showing a cooling device according to a first embodiment of the present invention. 
     
    
    
     MODE FOR INVENTION 
     Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted. 
     Referring to  FIGS. 1 and 2 , a cooling module  100  for illumination device according to the present invention is roughly composed of a substrate  200 , a heat pipe  300 , and a heat radiating plate  500 . 
     The substrate  200  is preferably a circular or polygonal plate-shaped metal material having good thermal conductivity, and an illumination part  50 , such as a plurality of LED elements, which generates a high heat is installed and in contact with a lower portion of the substrate  200 . 
     On the upper surface of the substrate  200 , a plurality of insertion grooves  250  having a diameter corresponding to a diameter of the heat pipe  300  described later are formed. 
     The heat pipe  300  is configured in such a manner that volatile fluid is injected into a closed container, and is a generally used heat conduction means in which heat is transferred to the other end of the heat pipe  300  at a high speed when heat is applied to one end of the heat pipe  300 . 
     The heat pipe  300  according to the present embodiment includes a horizontal part  320  inserted into the insertion groove  250  formed on the upper surface of the substrate  200 , and a vertical part  350  bent in the vertical direction from the horizontal part  320  and extending in the longitudinal direction. 
     Accordingly, the heat generated from the illumination part  50  is conducted to the substrate  200 , and the heat pipe  300  installed on the upper surface of the substrate  200  serves to dissipate heat generated from the illumination part  50 . 
     Referring to  FIG. 2 , the insertion groove  250  formed in the substrate  200  and the horizontal part  320  of the heat pipe  300  inserted into the insertion groove  250  are formed in the longitudinal direction toward the center of the substrate  200 , respectively. 
     When the illumination part  50  is actually operated, the temperature of a central portion is much higher than that of the edge of the substrate  200 . Therefore, as shown in  FIG. 2 , the horizontal parts  320  of the plurality of heat pipes  300  are disposed such that their adjacent distances become smaller while progressing toward the central portion. 
     That is, the horizontal part  320  of the heat pipe  300  is installed to be concentrated while progressing toward the central portion of the substrate  200 , so that the high temperature heat conducted from the central portion of the substrate  200  can be conducted easily to the vertical part  350  from the horizontal part  320  of the heat pipe  300 . 
     Referring to  FIG. 3 , another embodiment of the insertion groove  250  formed in the substrate  200  and the horizontal part  320  of the heat pipe  300  inserted into the insertion groove  250  is shown. 
     As shown in  FIG. 3 , the insertion groove  250  formed in the substrate  200  is formed in the longitudinal direction toward the central portion of the substrate  200 , and one side of the horizontal part  320  is formed to be biased while progressing toward the central portion of the substrate  200 . 
     Then, the horizontal part  320  of the heat pipe  300  is inserted into the insertion groove  250  formed to be biased. 
     As described above, when the insertion groove  250  is formed and the horizontal part  320  of the heat pipe  300  is inserted into the insertion groove  250 , if the number of the heat pipes  300  of  FIG. 3  corresponds to the number of heat pipes of  FIG. 2 , when a virtual concentric circle is drawn based on the central portion of the substrate, the area of the horizontal part  320  of the heat pipe  300  contacting the concentric circle is more increased than in the above described embodiment of  FIG. 2 . 
     That is, by increasing the area of the horizontal part  320  of the heat pipe  300  contacting the concentric area adjacent to the central portion of the substrate  200  having the highest temperature, the heat can be more easily conducted from the horizontal part  320  of the heat pipe  300  to the vertical part  350 . 
     In addition, as shown in  FIG. 4 , the insertion groove  250  formed in the substrate  200  and the horizontal part  320  of the heat pipe  300  inserted into the insertion groove  250  may be formed to be bent at least once. 
     This also increases the area of the horizontal part  320  of the heat pipe  300  contacting an area of the concentric circle adjacent to the central portion of the substrate  200  so that heat can be easily conducted from the horizontal part  320  of the heat pipe  300  to the vertical part  350 . 
     Referring to  FIG. 2 , the plurality of heat radiating plates  500  are laminated on the vertical part  350  of the heat pipe  300  to promote heat radiation of the heat pipe  300 . The heat radiating plate  500  includes a coupling part  520 , an inner fin part  540 , and an outer fin part  560 . 
     The coupling part  520  is in the form of a flat plate, and a plurality of coupling holes  523  are formed in the coupling part  520 . The vertical part  350  of the heat pipe  300  is inserted into and coupled to the coupling hole  523 . 
     The inner fin part  540  is cut inward from the coupling part  520  and formed to be twisted by a predetermined angle. That is, the inner fin part  540  is formed by cutting the inner portion of the coupling part  520  by a predetermined length, and by twisting the cut surface by a predetermined angle. 
     The outer fin part  560  is cut outward from the coupling part  520  and formed to be twisted by a predetermined angle. That is, the outer fin part  560  is formed by cutting the outer portion of the coupling part  520  by a predetermined length, and by twisting the cut surface by a predetermined angle. 
     Here, as shown in the drawing, the inner fin part  540  is formed to be twisted in a counterclockwise direction as viewed from the inside, and the outer fin part  560  is formed to be twisted in a counterclockwise direction as viewed from the outside. It is obvious that the direction of twisting the inner and outer fin parts  540  and  560  can be selected separately or together in a clockwise or counterclockwise direction. 
     Therefore, since the illumination part  50 , the substrate  200 , the heat pipe  300 , and the heat radiating plate  500  are connected to each other, the heat generated from the illumination part  50  is conducted to the substrate  200 , conducted to the vertical part  350  from the horizontal part  320  of the heat pipe  300 , and is radiated through the heat radiating plate  500  connected to the vertical part  350 . 
     Referring to  FIG. 5A , the inner fin part  540  is formed to be twisted by a relatively larger angle than the outer fin part  560 . 
     That is, the angle (β) at which the inner fin part  540  is tilted based on a virtual horizontal axis is relatively larger than the angle (α) at which the outer fin part  560  is tilted based on the virtual horizontal axis. 
     With the above configuration, the outer fin part  560  guides the flow of heat and the inflow of outside air to the side to promote heat radiation, and the inner fin part  540  guides the flow of heat and the inflow of outside air in the upward tilting direction to promote heat radiation. 
     The inner fin part  540  is exposed to the outside air, and the inner fin part  540  is positioned on an inner space formed by the substrate  200  in which heat of high temperature is generated and the inner fin part  540 , so that the temperature of the inner fin part  540  is relatively higher than that of the outer fin part  560 . 
     Accordingly, the twist angle (α) of the outer fin part  560  is formed to be relatively small to guide the outside air introduced horizontally into the inner space formed by the substrate  200  and the inner fin part  540 , and the twist angle (β) of the inner fin part  540  is formed to be relatively large to guide the flow of the introduced air to the upper portion of the heat radiating plate  500  in the upward tilting direction to promote the heat radiation. 
     Referring to  FIG. 5B , another embodiment of forming the twist angle of the inner fin part  540  is shown. 
     The inner fin part  540  includes a first inner fin part  541  formed adjacent to the inside, i.e., the coupling part  520  and a second inner fin part  542  extended from the outer side i.e., the first inner fin part  541 . 
     The second inner fin part  542  is formed to be twisted by a relatively larger angle than the first inner fin part  541 . That is, the angle (β 2 ) at which the second inner fin part  542  is tilted based on a virtual horizontal axis is relatively larger than the angle (β 1 ) at which the first inner fin part  541  is tilted based on the virtual horizontal axis. 
     Accordingly, the outer fin part  560  forms the twist angle (α) to be relatively small to guide the outside air introduced horizontally into an inner space formed by the substrate  200  and the inner fin part  540 , and forms the twist angle (β 1 ) of the first inner fin part  541  to be relatively larger than the twist angle (α) of the outer fin part  560  to guide the flow of the introduced air to the upward tilting direction. Further, the twist angle (β 2 ) of the second inner fin part  542  is formed to be relatively larger than the twist angle (β 1 ) of the first inner fin part  541  to guide the flow of the introduced air to the upper portion of the heat radiating plate  500  in the upward direction to promote the heat radiation. 
     Referring to  FIG. 6 , the inner fin part  540  and the outer fin part  560  may be divided into a first height portion H 1  having a predetermined height from the bottom and a second height portion H 2  having a height from the first height H 1  to the top. 
     The inner and outer fin parts  540  and  560  of the second height portion H 2  are formed to be twisted by an angle relatively larger than the inner and outer fin parts  540  and  560  of the first height portion H 1 . 
     As described above, when the actual illumination part  50  is operated, the temperature of the central portion of the substrate  200  is much higher than that of the edge of the substrate  200 , and when the laminated heat radiating plate  500  is viewed based on the vertical direction, the first height portion H 1 , which is a lower area, adjacent to the substrate  200  is relatively higher in temperature than the second height portion H 2  which is an upper area. 
     Accordingly, the tilt angle θ 1  of the inner and outer fin parts  540  and  560  of the first height portion H 1  is formed to be relatively small to guide the outside air introduced horizontally to the inner space formed by the substrate  200  and the inner fin part  540 . The twist angle η 2  of the inner and outer fin parts  540  and  560  of the second height portion H 2  is formed to be relatively large to guide the heat of high temperature of the first height portion H 1  to the upper portion of the heat radiating plate  500 , which is the upward direction, to promote heat radiation. 
     In addition to the twist angle of the first height portion H 1  and the second height portion H 2  shown in  FIG. 6 , as shown in  FIG. 5A , the twist angle (β) of the inner fin part  540  is formed to be relatively larger than the twist angle (α) of the outer fin part  560 . Further, as shown in  FIG. 5B , the twist angle (β 2 ) of the second inner fin part  542  is formed to be relatively larger than the twist angle (β 1 ) of the first inner fin part  541  to enhance the heat radiation effect. 
     Referring to  FIG. 7  and  FIG. 8 , a cooling device having a cooling module for illumination device according to the present invention includes a cooling module  100 , an illumination part  50 , and a case  700 . The cooling module  100  includes the cooling module  100  of all embodiments described in  FIGS. 1 to 6 . 
     A plurality of illumination parts  50  are installed to be in contact with the lower portion of the substrate  200 . Accordingly, as described above, the heat generated from the illumination part  50  is radiated through the substrate  200 , the heat pipe  300 , and the heat radiating plate  500 . 
     The case  700  accommodates the cooling module  100  and the illumination part  50 . The case  700  is provided with a plurality of vent holes  710  so that outside air can be smoothly introduced. 
     As shown in  FIG. 7 , the vent hole  710  may be formed only on the outer circumferential surface of the case  700 . Alternatively, as shown in  FIG. 8 , the vent hole  710  may be formed on the outer circumferential surface of the case  700  and a lower area. 
     In addition, referring to  FIG. 8 , a visor  730  is further provided in the lower outer circumferential surface of the case  700  adjacent to the illumination part  50 . 
     The visor  730  serves to control a path direction of light emitted from the illumination part  50 . 
     As shown in the drawing, in the form of a brim, the visor  730  may be installed only in the upper portion of the outer circumferential surface of the lower portion of the case  700 , or may be installed on the lateral side or lower portion of the outer circumferential surface. 
     In addition, the visor  730  may be formed in a cylindrical shape or a trumpet shape to be installed on the entire outer circumferential surface of the lower portion of the case  700 . 
     Although the exemplary embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Accordingly, the scope of the present invention is not construed as being limited to the described embodiments but is defined by the appended claims as well as equivalents thereto.