Heat dissipation device

Abstract

A heat dissipation device includes a base, a fin group on the base, a plurality of heat pipes and a covering fin mounted on a top of the fin group. The base includes a frame and a conducting plate engaging with a bottom of a central portion of the frame. The fin group includes a plurality of fins spaced from each other and horizontally stacked on the base. The heat pipes have evaporating sections sandwiched between the conducting plate and the base and condensing sections extending upwardly from the frame and through the fin group. The condensing sections have top ends located above a top fin of the fin group. The covering fin covers the upper ends of the condensing sections and has a plurality of latching legs extending downwardly therefrom to engage with the top fin.

1 . A heat dissipation device comprising:
 a base;   a fin group on the base;   a plurality of heat pipes having evaporating sections embedded in the base and condensing sections extending upwardly through the fin group, the condensing sections having top ends located at a top of the fin group; and   a covering fin covering the upper ends of the condensing sections and having a plurality of latching legs extending downwardly therefrom to engage with the top of the fin group.   
     
     
         2 . The heat dissipation device as claimed in  claim 1 , wherein each latching leg has a barb projecting inwardly from a lower end thereof and engaging into the top of the fin group. 
     
     
         3 . The heat dissipation device as claimed in  claim 2 , wherein a plurality of locking slots are defined in the top of the fin group engagingly receive the barbs therein. 
     
     
         4 . The heat dissipation device as claimed in  claim 3 , wherein the fin group comprises a plurality of fins spaced from each other and parallel to the base. 
     
     
         5 . The heat dissipation device as claimed in  claim 4 , wherein the locking slots are defined in a top one of the fins, the barbs of the latching legs are extended through the locking slots and locked with a bottom surface of the top one of the fins. 
     
     
         6 . The heat dissipation device as claimed in  claim 1 , wherein the covering fin comprises a main body separated from the top of the fin group, two side plates extending downwardly from two opposite lateral side edges of the main body and two engaging flanges extending inwardly from two bottom edges of the side plates and engaging the top of the fin group, the locking legs extending toward the fin group from bottom surfaces of the engaging flanges. 
     
     
         7 . The heat dissipation device as claimed in  claim 1 , wherein the base comprises a frame on which the fin group is placed and a conducting plate engaging a bottom of a central portion of the frame. 
     
     
         8 . The heat dissipation device as claimed in  claim 7 , wherein the evaporating sections of the heat pipes are sandwiched between the conducting plate and the central portion of the frame, the condensing sections of the heat pipes are extended upwardly from the frame through the fin group. 
     
     
         9 . The heat dissipation device as claimed in  claim 7 , wherein a plurality of fixing poles extend upwardly from a top of the frame and through the fin group. 
     
     
         10 . A heat dissipation device comprising:
 a base comprising a frame and a conducting plate engaging with a bottom of a central portion of the frame;   a fin group comprising a plurality of fins spaced from each other and horizontally stacked on the base;   a plurality of heat pipes having evaporating sections sandwiched between the conducting plate and the base and condensing sections extending upwardly from the frame and through the fin group, the condensing sections having top ends located above a top fin of the fin group; and   a covering fin covering the upper ends of the condensing sections and having a plurality of latching legs extending downwardly therefrom to engage with the top fin.   
     
     
         11 . The heat dissipation device as claimed in  claim 10 , wherein the covering fin comprises a main body separated from the top of the fin group, two side plates extending downwardly from two opposite lateral side edges of the main body and two engaging flanges extending inwardly from two bottom edges of the side plates and engaging the top of the fin group, the locking legs extending toward the fin group from bottom surfaces of the engaging flanges. 
     
     
         12 . The heat dissipation device as claimed in  claim 11 , wherein each latching leg has a barb projecting inwardly from a lower end thereof and engaging into the top fin. 
     
     
         13 . The heat dissipation device as claimed in  claim 12 , wherein a plurality of locking slots are defined in the top fin, the barbs of the latching legs are extended through the locking slots and locked with a bottom surface of the top fin.