Patent Publication Number: US-2011051415-A1

Title: Convective heat-dissipating LED illumination lamp

Description:
BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to an LED illumination lamp, and more particularly to an LED illumination lamp which dissipates heat by the convection mode. 
     2. Description of Related Arts 
     The current LED illumination lamp usually uses the integral sealing and the integral heat dissipation technology, that is to say, a plurality of low-power LEDs are directly weldedly fixed on a circuit board at a certain interval, then the circuit board is fixed to a heat-dissipating plate or a whole heat-dissipating casing of a lamp, so that the heat dissipation of the LEDs can be achieved. To prevent moisture and water, a mask made of glass (or other transparent materials) is added to the front of the lamp. As disclosed in China Invention Patent No. 200720050776.X, an LED illumination lamp comprises a protective outer cover and an aluminum substrate, an LED chip is preset on the aluminum substrate. 
     The above mentioned LED illumination lamp has some shortcomings as follows. 
     A plurality of low-power LEDs share a radiator, so the heat is too concentrated, a lot of heat are sealed within the mask made of glass (or other transparent materials). Therefore, the effect of heat dissipation is poor, the luminous efficiency and service life of LEDs are affected. Also, the effect of heat dissipation can be improved by increasing the radiator, thereby resulting in the excessive weight and higher cost of the lamp. Simultaneously, this whole structure don&#39;t facilitate replacing the LED devices or members, increases the complex degree of the partial production and maintenance of the light source, thereby resulting in low efficiency and high cost. 
     SUMMARY OF THE PRESENT INVENTION 
     An object of the present invention is to provide a convective heat-dissipating LED illumination lamp, which has the good moistureproof and waterproof performance, excellent heat dissipation performance, modular structure, and facilitates assembling, production and site maintenance. 
     Accordingly, in order to accomplish the above object, the present invention provides a convective heat-dissipating LED illumination lamp, comprising a plurality of LED lighting heat-dissipating units, a base for installing the lighting heat-dissipating units, and a frame fixedly connected with the base, wherein the base comprises a plurality of strip-shaped members spacedly arranged from each other at a certain distance or the base is a grid-shaped member for forming a hollow-out structure, so that a plurality of channels for direct convection with environmental air are formed in the base, the LED lighting heat-dissipating units are spacedly provided on the strip-shaped members or grid-shaped member, wherein each of the LED lighting heat-dissipating units comprises an LED chip, a circuit board, a circuit connecting member and a corresponding radiator, and forms an independent waterproof sealing body. 
     Furthermore, the circuit connecting member of each of the LED lighting heat-dissipating units comprises a pair of electrode leads leading from a bottom of the corresponding radiator, the electrode leads are provided within a groove provided at a side face of the base opposite to a side face of the base for installing the LED lighting heat-dissipating units, and connected with a power connector. 
     The electrode leads are provided within the groove and fixedly sealed by colloid. 
     Furthermore, the groove is strip-shaped. 
     Also, an accommodating part for placing the LED chip and the circuit board is provided at a side face of the radiator of each of the LED lighting heat-dissipating units. 
     Furthermore, a lens is provided over the LED chip, and is integrally and water-resistantly sealed with each of the LED lighting heat-dissipating units. 
     The base is made of metal. 
     The beneficial effects of the present invention are shown as follows. 
     Owing to the independent distribution of the circuit board of every lighting unit and the spaced hollow-out arrangement of the base, the present invention forms a penetrating structure, without the protective cover, thus forming effective convective heat-dissipating channels with the environment. Furthermore, every LED lighting heat-dissipating unit is separately sealed for effectively preventing moisture and water. The base comprises a plurality of strip-shaped members, thus facilitating the modular production, assembly production and site maintenance. 
     Every member of the present invention is separately sealed (every lighting heat-dissipating unit is separately sealed, and the circuit board and the cable are separately sealed). The surface of every lighting heat-dissipating unit can directly contact the environmental air for dissipating heat respectively, in such a manner that the heat dissipation of the whole LED lamp is divided into the separate heat-dissipation of a plurality of LED lighting units, so that the heat-dissipation surfaces are increased in the case of using the same aluminum. 
     If the structural strength permits, almost infinitely many LED lighting heat-dissipating units can be assembled together to be a great-power LED illumination lamp. Therefore, the present invention provides a much higher power waterproof LED illumination lamp under the circumstance that the upper limit on the power of an LED is greatly limited caused by the limitation of the heat-dissipation technology. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a preferred embodiment of the present invention. 
         FIG. 2  is a perspective view of a base of the present invention. 
         FIG. 3  is a three-dimensional diagram of a lighting heat-dissipating unit of the present invention. 
         FIG. 4  is a sectional view of the above lighting heat-dissipating unit of the present invention. 
         FIG. 5  is another perspective view of the base of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 4 , a convective heat-dissipating LED illumination lamp according to a preferred embodiment of the present invention is illustrated, wherein the convective heat-dissipating LED illumination lamp comprises a plurality of LED lighting heat-dissipating units  1 , a base  2  for installing the lighting heat-dissipating units, and a frame  4  fixedly connected with the base  2 . 
     The base  2  comprises a plurality of strip-shaped members spacedly arranged from each other at a certain distance, thus forming a hollow-out structure. Therefore, a plurality of channels for direct convection with environment air are formed in the base  2 . The LED lighting heat-dissipating units  1  are spacedly provided on the strip-shaped members. Each of the LED lighting heat-dissipating units  1  can independently contact environment air, thus dissipating heat respectively. 
     Each of the LED lighting heat-dissipating units  1  comprises an LED chip  11 , a circuit board  3 , a circuit connecting member  14  (which is positive and negative leads in the preferred embodiment) and a corresponding radiator  12 , and forms an independent waterproof sealing body. The circuit board  3  is independently waterproof sealed. 
     The circuit connecting member  14  of each of the LED lighting heat-dissipating units  1  comprises a pair of electrode leads leading from a bottom of the corresponding radiator  12 . The electrode leads are provided within a groove  21  provided at a side face of the base  2  opposite to a side face of the base  2  for installing the LED lighting heat-dissipating units  1 , and connected with a power connector  14 . The electrode leads are provided within the groove  21  and fixedly sealed by colloid. The groove  21  is strip-shaped. 
     Furthermore, an accommodating part  121  for placing the LED chip  11  and the circuit board  3  is provided at a side face of the radiator  12  of each of the LED lighting heat-dissipating units  1 . A lens  13  is provided over the LED chip  11 , and is integrally and water-resistantly sealed with each of the LED lighting heat-dissipating units  1 . The lens  13  can not only seal the circuit board  3  by the sealing material, but effectively regulate the light distribution of the LEDs. 
     The base  2  is made of metal. 
     Referring to  FIG. 5 , the base  2  of the present invention also can be a grid-shaped structure. The LED lighting heat-dissipating units  1  are spacedly provided on the grid-shaped structure. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. Its embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.