Heat spreader and heat dissipation device using same

Abstract

A heat dissipation fan includes a fan frame, a bearing assembly, a stator and a rotor. The fan frame includes a base and a central tube. The central tube includes an open top end and an open bottom end. The base defines a receiving concave at a bottom surface thereof. The receiving concave communicates with the central hole. A top wall is formed by the base over the concave. A sidewall is formed between the top wall and the bottom surface of the base and surrounds the concave. A plurality of first locking units extend from the top wall into the receiving concave. The bearing assembly includes an oil sealing cover for sealing the open bottom end of the central tube. The oil sealing cover includes a plurality of second locking units which are detachably interlocked with the first locking units to mount the oil sealing cover to the base.

1 . A heat dissipation device comprising:
 a heat spreader comprising a main plate and an end cover coupling to one lateral side of the main plate, the main plate defining a plurality of parallel through holes therein, each of the through holes having an open end facing the lateral side of the main plate, a plurality of wick structures being respectively disposed in the through holes, the end cover sealing the open ends of the through holes to form a plurality of hermetical channels in the spreader, a working medium being contained in each of the channels; and   a plurality of fins arranged on a surface of the main plate perpendicular to the lateral side.   
   
   
       2 . The heat dissipation device of  claim 1 , wherein each of the through holes has a second open end facing another lateral side of the main plate opposite to the lateral side, the heat spreader further comprising a second end cover located at the another lateral side of the main plate for sealing the second open ends of the through holes, each of the end covers comprising a plurality of connecting portions received in the open ends of the through holes, respectively. 
   
   
       3 . The heat dissipation device of  claim 2 , wherein each of the connecting portions has a diameter lager than a diameter of each of the through holes, the end covers connected with the main plate by interference fit between the connecting portions and the open ends of the through holes. 
   
   
       4 . The heat dissipation device of  claim 2 , wherein each of the connecting portions has a diameter smaller than a diameter of each of the through holes, the end covers connected with the main plate by soldering filled between each connecting portion and an inner surface of the main plate at the open ends of a corresponding through hole. 
   
   
       5 . The heat dissipation device of  claim 2 , wherein the main plate defines a first and a second receiving grooves at the two lateral sides thereof, respectively, each of the through holes communicating the first receiving groove with the second receiving groove, each of the end covers comprising a sealed portion received in a corresponding one of the first and the second receiving grooves, the connecting portions extending from the sealed portions into the through holes. 
   
   
       6 . The heat dissipation device of  claim 5 , wherein each of the receiving grooves is rectangular, the through holes are arranged in the main plate side by side, a height of the receiving groove is larger than a diameter of each of the through holes, and a length of the receiving groove is larger than a width of an occupying area of the through holes. 
   
   
       7 . The heat dissipation device of  claim 1 , wherein each of the fins comprises a plate-shaped main body extending upwardly from the top surface of the main plate, the main body being parallel to the through holes. 
   
   
       8 . The heat dissipation device of  claim 1 , wherein each of the fins comprises a main body and a flange extending perpendicularly from a bottom end of the main body to a neighboring fin, the flanges cooperatively forming a planar surface contacting the top surface of the main plate. 
   
   
       9 . A heat spreader comprising:
 a main plate defining a plurality of parallel through holes in an interior thereof, each of the through holes communicated with two opposite lateral sides of the main plate;   two end covers located at the two lateral sides of the main plate, each of the end covers comprising a plurality of connecting portions received in distal ends of the through holes for sealing the through holes;   a plurality of wick structures disposed in the through holes and contacting an inner surface of the main plate; and   a working medium being contained in each of the through holes.   
   
   
       10 . The heat spreader of  claim 9 , wherein the main plate defines two receiving grooves at the two lateral sides of the main plate, respectively, distal ends of each through hole communicated with the two receiving grooves respectively, each of the end covers comprising a sealed portion received in a corresponding receiving groove. 
   
   
       11 . The heat spreader of  claim 10 , wherein the connecting portions extend from one surface of the sealed portion facing the main plate towards the distal ends of the through holes, respectively. 
   
   
       12 . The heat spreader of  claim 10 , wherein each of the receiving grooves is rectangular, each of the sealed portions has a shape and a size corresponding to those of the each of the receiving grooves.