Abstract:
An LED lamp includes a lamp seat, a lampshade and a plurality of LED modules. The lamp seat defines a groove thereof. The lampshade covers the lamp seat and forms a protrude portion slidably engaged in the groove of the lamp seat. The LED modules are received in the lamp seat for emitting light out from the lampshade.

Description:
BACKGROUND OF THE INVENTION  
   1. Field of the Invention 
   The present invention relates to an LED lamp, and particularly to an LED lamp having simple assembling and disassembling structure. 
   2. Description of Related Art 
   The technology of light emitting diodes has rapidly developed in recent years from indicators to illumination applications. With the features of long-term reliability, environment friendliness and low power consumption, the LED is viewed as a promising alternative for future lighting products, particularly to street lamps. Over time street lamps accumulate a lot dust inside and out. In this state, the street lamp has to be disassembled in order to clean the dust particles. Generally, a structure of the street lamp is complicated that it is unduly time-consuming to disassemble and assemble the street lamp. 
   Therefore, a new LED lamp which has a simple assembling and disassembling structure is desired to overcome the above described shortcomings. 
   SUMMARY OF THE INVENTION  
   An LED lamp includes a lamp seat, a lampshade and a plurality of LED modules. The lamp seat defines a groove thereof. The lampshade covers the lamp seat and forms a protrude portion slidably engaged in the groove of the lamp seat. The LED modules are received in the lamp seat for emitting light out from the lampshade. 

   
     Other advantages and novel features will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which: 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
       FIG. 1  is an exploded view of an LED lamp in accordance with a first embodiment of the present invention. 
       FIG. 2  is an assembled view of  FIG. 1 . 
       FIG. 3  is a cross sectional view of a lampshade of the LED lamp of  FIG. 1 . 
       FIG. 4  is an exploded view of an LED lamp in accordance with a second embodiment of the present invention. 
       FIG. 5  is an exploded view of an LED lamp in accordance with a third embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION  
   Referring to  FIGS. 1-2 , an LED lamp  10  of a first embodiment of the invention comprises a lamp seat  11 , a plurality of LED modules  13  received in the lamp seat  11  and a lampshade  12  corresponding to the lamp seat  11 . 
   The lamp seat  11  is a cuboid and has an elongated bottom surface  111 . The lamp seat  11  defines a receiving chamber  130  at a centre thereof. The LED modules  13  are received in the receiving chamber  130 . A bottom surface (not labeled) of the LED modules  13  and the bottom surface  111  of the lamp seat  11  are coplanar. The lamp seat  11  defines two spaced grooves  110  at opposite sides thereof. Each groove  110  has a trapeziform cross section, and a distance between two opposite inner sides of the each groove  110  at upper portion is larger than that each groove  110  at lower portion. Each groove  110  has an elongated top surface  1100 . 
   A material of the lampshade  12  is selected from polymethylmethacrylate, poly carbonate, silicone, epoxy and polycrylate or a glass containing a mixture of ZnO, B 2 O 3 , SiO 2 , Nb 2 O 5 , Na 2 O, or Li 2 O 5 . The lampshade  12  has a transmission rate greater than 90% and a refraction rate between 1.4 and 1.7. A length of the lampshade  12  equals to the length of the lamp seat  11 . The lampshade  12  has an arc-shaped configuration and comprises an elongated flat top surface  121 , an arc-shaped bottom surface  122 , an arc-shaped front surface  123  and an arc-shaped rear surface  125 . The front and rear surfaces  123 ,  125  are located at opposite ends of the lampshade  12  and connect with the top and bottom surfaces  121 ,  122 . Light emitted from the LED modules  13  can travel to an ambient from the top surface  121  and the bottom surface  122 . The front and rear surfaces  123 ,  125  are substantially coated with reflective films (not shown). The front and rear surfaces  123 ,  125  function as two reflectors to reflect light produced by the LED modules  13 , thus light travel through the bottom surface  122  is accumulated in a determined circumstance to enhance a luminance of the determined circumstance. 
   Referring to  FIG. 3  also, a transparent layer  126  is formed on an outside of the bottom surface  122  and a photosensitive layer  124  is formed on an outside of the transparent layer  126 . The transparent layer  126  is made from silicon or Al 2 O 3 . The transparent layer  126  is used to prevent the photosensitive layer  124  from directly contacting with the bottom surface  122 . The photosensitive layer  124  generates super-hydrophilicity after absorbing UV rays emitted by the sun so that when rainwater contacts the photosensitive layer  124 , it can easily enters a gap between the contaminations and the photosensitive layer  124  to clear up the contaminations. 
   Two spaced protruding portions  120  protrude from the top surface  121  of the lampshade  12 . Each protruding portion  120  has a shape corresponding to each groove  110 . Each protruding portion  120  comprises an elongated top surface  1200  parallel to the top surface  121  of the lampshade  12  and two side surfaces (not labeled) extending downwardly from opposite edges of the top surface  1200  to the top surface  121  of the lampshade  12 . The protruding portions  120  can slide along the grooves  110  of the lamp seat  11 . 
   In assembly, the protruding portions  120  slide along the grooves  110  of the lamp seat  11  until the protruding portions  120  being fully engaged in the grooves  110 ; thus, the lamp seat  11  and the lampshade  12  are assembled together. In this state, the top surfaces  1200  of protruding portion  120  and the top surfaces  1100  of the grooves  110  have an intimate contact with each other and the bottom surface  111  of the lamp seat  11  and the top surface  121  of the lampshade  12  have an intimate contact with each other to prevent air and dust particles from entering therebetween. A silica gel layer (not shown) can be disposed between the top surfaces  1200  of the protruding portion  120  and the top surfaces  1100  of the grooves  110  to increase friction of the groove  110  and the protruding portion  120 , allowing the protruding portion  120  to further intimately engaging in the groove  110 . 
   Referring to  FIG. 4 , a LED lamp  10   a  of a second embodiment of the present invent is shown. The LED lamp  10   a  is similar to the LED lamp  10  of the first embodiment of the present invention. The LED lamp  10   a  comprises a lamp seat  11   a  and a lampshade  12   a  corresponding to the lamp seat  11   a.  The LED modules  13  are received in the centre of the lamp seat  11   a.  Two spaced grooves  110   a  are defined at opposite sides of a bottom portion of the lamp seat  11   a.  Each groove  110   a  is different from each groove  110  of the first embodiment. Each groove  110   a  has a bottom portion  1101   a  and a top portion  1103   a  extending upwardly from the bottom portion  1101   a.  The bottom portion  1101   a  is defined by two elongated spaced surfaces (not labeled). The top portion  1103   a  has an arc-shaped configuration. Two spaced protruding portions  120   a  protrude upwardly from opposite sides of the lampshade  12   a.  Each protruding portion  120   a  has a shape corresponding to each groove  110   a.  The protruding portions  120   a  are received in the grooves  110   a.    
   Referring to  FIG. 5 , a LED lamp  20  of a third embodiment of the present invent is shown. The LED lamp  20  comprises a lamp seat  21 , a bent baffle-plate  26  extending downwardly and outwardly from a front end of the lamp seat  21  and a lampshade  22 . The baffle-plate  26  is used to prevent contaminations from entering the LED lamp. The lamp seat  21  is similar to the lamp seat  11  of the first embodiment and has a bottom surface  111  and defines two grooves  110 , but further defines a groove  210  at the front end thereof. The groove  210  communicates with the grooves  110 . The lampshade  22  is different from the lampshade  12  of the first embodiment. The lampshade  22  has a configuration generally like a frustum. The lampshade  22  comprises a flat top surface  221 , two flat lateral surfaces  227 ,  228  extending slantwise from lateral edges of the top surface  221 , an arc-shaped front surface  223 , an arc-shaped rear surface  225  and an arc-shaped bottom surface  222 . The front and the rear surfaces  223 ,  225  extend slantwise from the front and rear edges of the top surface  221 . The lateral surfaces  227 ,  228  and the front and rear surfaces  223 ,  225  are substantially coated with reflective films (not shown), thus, the lateral surfaces  227 ,  228  and the front and rear surfaces  223 ,  225  function as four reflectors to reflect light produced by the LED modules  13 . Two protruding portions  220  protrude upwardly from lateral edges of the top surface  221 . Each protruding portion  220  is the same as each protruding portion  120  of the first embodiment and is received in each groove  110  of the lamp seat  21 . The protruding portions  220  connect with each other via a crossbeam  224  protruding upwardly from the front edge of the top surface  221 . The crossbeam  224  is received in the groove  210 . 
   It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.