Abstract:
An LED road lamp includes a heat dissipater module containing circuit boards, LED chips, and a cooling fin seat; and a completely sealed power supply. By directly using the cooling fin seat as an outer cover of a road lamp to contact with atmosphere for cooling, and directly transmitting heat from the LED chips and the circuit boards to a stand pipe, a dual cooling effect is achieved. Heat of the power supply is dissipated from the stand pipe through its sealed outer casing, to largely increase cooling area, lower temperature, and increase a cooling efficiency, preventing the power supply from being affected by ambient weather. Therefore, lifetimes of usage of the LED circuit boards, the LED chips, and the power supply are prolonged, the circuit boards are quickly assembled on and disassembled from a cooling base, and convenience in assembling and disassembling the circuit boards is improved.

Description:
BACKGROUND OF THE INVENTION 
     a) Field of the Invention 
     The present invention relates to an LED (Light Emitting Diode) road lamp, and more particularly to an LED road lamp which uses a cooling fin seat as an outer cover of a road lamp, with the cooling fin seat being directly exposed in atmosphere and being directly in contact with atmosphere, so as to achieve a better heat dissipation effect and to prolong a lifetime of usage of LED chips. 
     b) Description of the Prior Art 
     A typical conventional LED road lamp is disclosed in a Taiwan New Utility Model No. M303333, “Assembly Structure of an LED Road Lamp and a Heat Dissipation Module.” In that model, an upper cover plate should be used to cover a heat conduction plate. However, as a cooling space of the heat conduction plate is limited, it is not able to contact with atmosphere, which allows heat to be accumulated in an interior of the upper cover plate, thereby being unable to quickly dissipate the heat. Moreover, as a heat pipe is vertically transfixed into a spacer plate and the heat conduction plate, the heat pipe is only provided with a shorter position to serve as a hot end, and only the hot end is in touch with a surface of an isothermal plate. As the hot end is provided with shorter length, smaller area and volume to receive heat, temperature at which the heat is conducted from the heat pipe to the heat conduction plate will be limited; therefore, it will not be able to achieve an object of high-efficiency heat dissipation in a short time, and hence a lifetime of usage of an LED lamp set cannot be increased effectively. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide an LED road lamp which uses a cooling fin seat as an outer cover, which is directly exposed in atmosphere and is directly in contact with atmosphere, so as to achieve a better heat dissipation effect and to prolong a lifetime of usage of circuit boards and LED chips. 
     Another object of the present invention is to provide an LED road lamp which uses a completely sealed power supply, such that the power supply will not be affected by ambient weather, and its lifetime of usage can be increased by forming a heat dissipation plate on an outer casing of the power supply. 
     Still another object of the present invention is to provide an LED road lamp, which uses a U-shape heat pipe, with its right straight tube being connected to a bottom surface of a circuit board, and its left straight tube being connected to a cooling fin seat, so as to effectively conduct heat on a surface of the circuit board through the U-shape heat pipe. 
     To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a perspective view of parts of the present invention. 
         FIG. 2  shows an exploded view of parts of the present invention. 
         FIG. 3  shows a cross sectional view of the present invention. 
         FIG. 4  shows an exploded view of parts of the present invention which is installed with a U-shape heat pipe. 
         FIG. 5  shows a cross sectional view of parts of the present invention which is installed with a U-shape heat pipe. 
         FIG. 6  shows another cross sectional view of the present invention. 
         FIG. 7  shows a cross sectional view of the present invention which is installed with a U-shape heat pipe. 
         FIG. 8  shows a cross sectional view of an action for assembling and disassembling circuit boards of the present invention. 
         FIG. 9  shows an exploded view of the present invention wherein a lamp is connected with a stand pipe. 
         FIG. 10  shows a perspective view of the present invention wherein a lamp is connected a stand pipe. 
         FIG. 11  shows a cross sectional view of the present invention wherein a power supply is installed inside a stand pipe. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIG. 1  and  FIG. 2 , the present invention is to provide an LED road lamp which includes a heat dissipater module  100  composed primarily of circuit boards  20 , LED chips  22  (as shown in  FIG. 3 ), and a cooling fin seat  40 , to serve as a light emitting device of the LED road lamp, wherein the cooling fin seat  40  is directly exposed in and is directly in contact with atmosphere for cooling; and a sealed power supply  90  (as shown in  FIG. 9 ) for supplying power to the circuit boards  20  and the LED chips  22 . 
     Referring to  FIG. 9 , the completely sealed power supply  90  is fixed on a surface of a stand pipe  50 , and supplies power to the circuit boards  20  (as shown in  FIG. 1 ) through an electric wire  70 . 
     Referring to  FIG. 11 , the completely sealed power supply  90  is fixed in a hollow stand pipe  50 , and supplies power to the circuit boards  20  (as shown in  FIG. 1 ) through an electric wire  70 . 
     Referring to  FIG. 10 , the completely sealed power supply  90  is pre-buried in a ground close to a bottom of a stand pipe  50 , and supplies power to the circuit boards  20  (as shown in  FIG. 1 ) through an electric wire  70 . 
     Referring to  FIG. 1  and  FIG. 2 , the heat dissipater module  100  further includes a cooling substrate  10 , a front end  12  of which is fixed to a lamp fixing seat  60  that is connected to a transversal tube  50 ′ (as shown in  FIG. 9 ) at a top end of the stand pipe  50  through a tube connector  62 ; the cooling fin seat  40 , which is formed by welding a plurality of fins  41  to form an outer cover of a road lamp, with a bottom part  44  of the cooling fin seat  40  being welded on an upper surface  16  of the cooling substrate  10 ; at least one circuit board  20 , an outer surface  21  of which is welded with at least one LED chip  22 , and which is fixed on a bottom board  18  of the cooling substrate  10  (as shown in  FIG. 3 ); and a light-permeable lamp shade  80 , which is installed below the circuit boards  20 . 
     Left and right sides of the lamp fixing seat  60  are fixed respectively with a left wall  54  and a right wall  52  having a similar shape. Inner walls of the left and right walls  54 ,  52  are provided respectively with first positioning slots  521 ,  541 , and second positioning slots  522 ,  542 . Left and right sides of the cooling substrate  10  are locked respectively into the first positioning slots  521 ,  541 . 
     Two sides of the lamp shade  80  are locked respectively into the second positioning slots  522 ,  542 , and a front stopping sheet  550  is fixed at outer ends  524 ,  544  of the left and right walls  54 ,  52 , and is fixed at a rear end  14  of the cooling substrate  10 . 
     The bottom board  18  of the cooling substrate  10  is fixed with at least one fixing sheet  25 , such that a locking slot  26  (as shown in  FIG. 7  and  FIG. 8 ) is formed between the fixing sheet  25  and the bottom board  18 . 
     An inner side  27  of the circuit board  20  is locked into the locking slot  26 , an outer end of the circuit board  20  is provided with a connection hole  28 , and a bolt  281  is screwed into the connection hole  28  and a connection hole  13  of the cooling substrate  10 . 
     Referring to  FIG. 1 , an outer end of the circuit board  20  is fixed with a connector A  29  for electric connection, and an electric wire  70  is connected with at least one connector B  72  which is inserted with the connector A  29  of the circuit board  20 . 
     Referring to  FIG. 9 , a rear side of the lamp fixing seat  60  is connected with a tube connector  62 . A hollow stand pipe  50  is used as an electric pole, a front end of which is bended with a transversal tube  50 ′ which intersects with the stand pipe  50  by an included angle θ 1  which is larger than 90°. A front end of the transversal tube  50 ′ is provided with an inner tube connector  51  which can be transfixed into an interior of the tube connector  62 , and the electric wire  70  is entered into an internal space of the stand pipe  50  from an internal space of the inner tube connector  51 . 
     The inner surface  23  of the circuit board  20  is coated with a layer of heat conductive material  231  which is in contact with the bottom board  18  of the cooling substrate  10 . 
     Referring to  FIG. 4 , a surface of the cooling substrate  10  is provided with more than one groove  101 , and a body of the cooling fin seat  40  is transversally opened with at least one through-hole  45 . At least one U-shape heat pipe  30 , with each U-shape heat pipe  30  being formed integrally by an upper straight tube  32 , a lower straight tube  34 , and a transversal tube  36 , is transfixed into the cooling fin seat  40  by inserting the upper straight tube  32  into the through-hole  45  of the cooling fin seat  40 , and tightly fitting the lower straight tube  34  into the groove  101  on the surface of the cooling substrate  101 . 
     Referring to  FIG. 7  and  FIG. 8 , two outer ends of a U-shape heat pipe  30  are a closed surface  301 . 
     Referring to  FIG. 9  and  FIG. 10 , a hollow stand pipe  50  is used as an electric pole, and a transversal tube  50 ′ which is at a top end of the stand pipe  50  is bended with an angle, allowing the entire stand pipe  50  and the transversal tube  50 ′ to form an L-shape body. The transversal tube  50 ′ intersects with the vertical stand pipe  50  by an included angle θ 1  which is larger than 90°, and a bottom end of the vertical stand pipe  50  fixed on a ground W. An entire set of heat dissipater module  100  which is fixed on the transversal tube  50 ′ is shown in  FIG. 3 , wherein the heat dissipater module  100  intersects by an elevation angle θ 2  with a horizontal line, a tube connector  62  is provided with a through-hole  621  and a screw-hole  622 , and an inner tube connector  51 , which is a round tube (as shown in  FIG. 9 ), is located at an outer end of the transversal tube  50 ′. The inner tube connector  51  is inserted into the through-hole  621 , and is also provided with a screw-hole  521 . A bolt  53  is screwed into the screw-holes  622 ,  521 , further allowing the entire set of heat dissipater module  100 , a lamp fixing seat  60  and the tube connector  62  to be fixed on the inner tube connector  51 . 
     If LED chips  22  of the present invention do not generate high heat from illumination, then there is no need to transfix a U-shape heat pipe to assist heat dissipation. Therefore, as shown in  FIGS. 1 to 3 , an upper surface  16  of a cooling substrate  10  is a plane, and a cooling fin seat  40  is formed by welding a plurality of fins  41  with a soldering material, with a groove of cooling space formed between every two neighboring fins  41  ( 41 ). A bottom part  44  of the cooling fin seat  40  is welded on the upper surface  16  of the cooling substrate  10 , which is made by an aluminum alloy, with a soldering material, such that the cooling fin seat  40  and the cooling substrate  10  are assembled as one integral body. A front end  12  of the cooling substrate  10  is provided with a connection hole  181 , and the lamp fixing seat  60  is provided with a connection hole  65 . As shown in  FIG. 2 , a bolt  572  is screwed into the two connection holes  65 ,  181 , allowing the cooling substrate  10  to be assembled with the lamp fixing seat  60  as one integral body. Two sides of the cooling substrate  10  are provided respectively with connection holes  11 , a left wall and a right wall  54 ,  52  are provided respectively with connection holes  55 ,  56 , and a plurality of bolts  57  are screwed into the connection holes  55 ,  56 ,  11  (as shown in  FIG. 2 ), allowing the left and right sides of the cooling substrate  10  to be fixed respectively with the left and right walls  54 ,  52 . Front ends of the left and right walls  54 ,  52  are provided respectively with connection holes  58 ,  59 , left and right sides of the lamp fixing seat  60  are provided respectively with connection holes  66  ( 66 ), and a set of bolts  571  are screwed respectively into the connection holes  58 ,  59 ,  66  ( 66 ), allowing the left and right walls  54 ,  52  to be fixed on the lamp fixing seat  60 . 
     Referring to  FIG. 1 , a plurality of connectors B  72  are serially connected on an electric wire  70 , respectively. The connectors B  72  can be quickly assembled with or disassembled from connectors A  29 , and the electric wire  70  passes through the through-hole  621 , and is further entered into an interior space of the stand pipe  50  (as shown in  FIG. 9 ). The electric wire  70  is connected with a power supply  90  which can be fixed on a surface of the stand pipe  50  (as shown in  FIG. 9 ), or be pre-buried in a ground W (as shown in  FIG. 10 ). If the stand pipe  50  is provided with a larger diameter, then the power supply  90  can be also fixed in an interior space of the stand pipe  50 , as shown in  FIG. 11 . 
     Referring to  FIG. 4  and  FIG. 8 , a fixing sheet  25  is fixed on a bottom surface of the cooling substrate  10  through a bolt  251 , so as to form a locking slot  26 . 
     Referring to  FIG. 8 , a circuit board  20  can be quickly assembled at or disassembled from a bottom board  18  of the cooling substrate  10 . If the circuit board  20  needs to be replaced, the circuit board  20  can be displaced and taken out of the locking slot  26 , by only pulling the connector B  72  out of the connector A  29 , and then taking out the bolt  281 . Referring to  FIG. 8 , if the circuit board  20  is to be assembled at the bottom board  18  of the cooling base  10 , an inner side  27  of the circuit board  20  is first locked into the locking slot  26 , then the bolt  281  is locked into the connection holes  28 ,  13  to fix the circuit board  20  at the bottom board  18 , and next the connector B  72  is inserted into the connector A  29 , thus allowing the circuit board  20  to be energized by power. The bottom board  18  of the cooling substrate  10  is attached with a layer of heat conductive material  231 . As the heat conductive material  231  is non-viscous, the circuit board  20  will not be adhered to the bottom board  18 , but only that heat generated by the circuit board  20  can be quickly transmitted to the cooling substrate  10  through a heat conduction function of the heat conductive material  231 . The heat absorbed by the cooling substrate  10  is dissipated through the cooling fin seat  40  from atmosphere, which provides a better effect of heat dissipation, and further increases a lifetime of usage of the LED chips  20 . As shown in  FIG. 3 , the cooling substrate  10  is connected with the left and right walls  54 ,  52  of the lamp fixing seat  60  as well as a front stopping sheet  550 ; therefore, the heat absorbed by the cooling substrate  10  can be dissipated through the lamp fixing seat  60 , the left and right walls  54 ,  52 , and the front stopping sheet  550  (as shown in  FIG. 1  and  FIG. 3 ). More particularly, the lamp fixing seat  60  is connected to the transversal tube  50 ′, and hence the heat absorbed by the lamp fixing seat  60  can be conducted to the transversal tube  50 ′, and through the transversal tube  50 ′ to the stand pipe  50  (as shown in  FIG. 10 ), thereby achieving a further heat dissipation effect. 
     Referring to  FIG. 3 , as the entire set of heat dissipater module  100  intersects with a horizontal line by an elevation angle θ 2 , when raining, water will flow through grooves  101  of the cooling fin seat  40  and to a rear side, and drain out downward from a rear surface of the lamp fixing seat  60 . As the cooling fin seat  40  and the cooling substrate  10  are all treated by a special corrosion-proof process (anti-acid and anti-base), the cooling fin seat  40  and the cooling substrate  10  are all provided with a highly anti-acid and anti-base function, to prevent from material corrosion. Accordingly, the cooling fin seat  40  of the present invention can not only replace an outer cover of a conventional road lamp, but also form a cooler. In a mean time, the flow of water can wash off dusts in the grooves  101  of the cooling fin seat  40 . 
     Referring to  FIG. 4 , to further increase the heat dissipation effect, a U-shape heat pipe  30  is optionally transfixed into the cooling fin seat  40 , with a lower straight pipe  34  being tightly fitted into the grooves  101 . Therefore, the heat absorbed by the cooling base  10  is transmitted to the entire U-shape heat pipe  30  through the lower straight pipe  34 , and then transmitted to the cooling fin seat  40  to be dissipated in atmosphere, which enables an even better effect of heat dissipation. 
     Referring to  FIG. 4  and  FIG. 5 , the front stopping sheet  550  is screwed respectively at a rear end  14  of the cooling substrate  10 , and into the connection holes  58 ,  59  of the left and right walls  54 ,  52 , by the plurality of bolts  551 . When a lamp shade  80  needs to be removed, the front stopping sheet  550  must be removed first, and then the lamp shade  80  can be taken out from a second positioning slot  522 . 
     Referring to  FIG. 9 , the power supply  90  is designed as a sealed state, to isolate moisture and rain from intruding into the power supply  90 . More particularly, an outer casing  91  of the power supply  90  is made by an aluminum alloy or other heat dissipation material, and is provided with a cooling effect. Heating elements (not shown in the drawing) in the power supply  90  can thermally conduct with an inner wall of the outer casing  91  of the power supply  90 , through heat conductive elements (not shown in the drawing), enabling the outer casing  91  of the power supply  90  to be also provided with a cooling function.