Heat sink with built-in fan

Abstract

A heat sink with a built-in fan includes a heat radiation base, a heat radiation fin module and a fan. The heat radiation base has a plurality of spaced grooves formed on an inner side thereof for engagement of heat radiation fins of the heat radiation fin module. The heat radiation fins are respectively inserted in the grooves of the heat radiation base and compressed in the grooves by stamping so that the heat radiation fins are connected to the heat radiation base. The fan is located inside the heat radiation fin module and surrounded by the plurality of heat radiation fins. When the heat radiation base absorbs heat, the fan is started to dissipate heat quickly. At least one heat conduction pipe is connected between the heat radiation base and the heat radiation fin module to enhance the heat dissipation efficiency of the heat sink.

What is claimed is: 
     
         1 . A heat sink with a built-in fan, comprising a heat radiation base, a heat radiation fin module and a fan;
 the heat radiation base being a flat plate, the heat radiation base having a plurality of spaced grooves formed on an inner side thereof;   the heat radiation fin module comprising a plurality of heat radiation fins, each heat radiation fin having a lower end;   the fan being coupled to the inner side of the heat radiation base, the fan being located inside the heat radiation fin module and surrounded by the plurality of heat radiation fins;   wherein the lower ends of the heat radiation fins of the heat radiation fin module are respectively inserted in the grooves of the heat radiation base and compressed by stamping so that the lower ends of the heat radiation fins are embedded in the grooves of the heat radiation base.   
     
     
         2 . The heat sink with a built-in fan as claim in  claim 1 , further comprising an upper cover disposed on the heat radiation fin module. 
     
     
         3 . The heat sink with a built-in fan as claim in  claim 2 , wherein the upper cover is an annular cover, the upper cover having a plurality of insertion holes corresponding to the heat radiation fins, each heat radiation fin of the heat radiation fin module having an extension portion extending from an upper end thereof, the extension portions of the heat radiation fins being respectively inserted through the insertion holes of the upper cover and bent over the upper cover. 
     
     
         4 . The heat sink with a built-in fan as claim in  claim 1 , wherein the fan is a turbo fan, the fan comprising a rotation axle and a plurality of blades, the rotation axle being coupled to the inner side of the heat radiation base. 
     
     
         5 . The heat sink with a built-in fan as claim in  claim 4 , wherein the blades of the turbo fan are curved and arranged in the same direction and the heat radiation fins are curved and arranged in a reverse direction relative to the blades. 
     
     
         6 . The heat sink with a built-in fan as claim in  claim 1 , wherein the lower end of each heat radiation fin is a dual-layer or multi-layer insertion portion. 
     
     
         7 . The heat sink with a built-in fan as claim in  claim 1 , wherein the heat radiation base comprises two symmetric foot seats coupled to an outer side of the heat radiation base. 
     
     
         8 . The heat sink with a built-in fan as claim in  claim 1 , further comprising at least one heat conduction pipe connected between the heat radiation base and the heat radiation fin module, the heat conduction pipe being attached to a bottom of the heat radiation base and surrounding the heat radiation fins of the heat radiation fin module. 
     
     
         9 . The heat sink with a built-in fan as claim in  claim 8 , wherein each heat radiation fin of the heat radiation fin module has an engaging recess and a recess wall along the engaging recess for engagement of the heat conduction pipe. 
     
     
         10 . The heat sink with a built-in fan as claim in  claim 2 , wherein the upper cover is an annular cover, the upper cover having a plurality of insertion holes corresponding to the heat radiation fins, each heat radiation fin of the heat radiation fin module having an extension portion extending from an upper end thereof and a notch at one side or both sides of the extension portion, wherein the extension portions are respectively inserted through the insertion holes of the upper cover, and the one side or both sides of the extension portions are bent outwardly to hold against the upper cover.