Heat dissipation apparatus incorporating a fan

Abstract

A heat dissipation apparatus includes a heat sink and a fan. The heat sink includes a plurality of radial first and second fins. The first and second fins each include a main body and an extension arm extending upwardly from the main body. The main bodies and the extension arms cooperatively form a space therebetween for securely receiving the fan therein. Each extension arm defines an engaging groove communicating with the space. A height of the extension arm of each second fin is less than that of the extension arm of each first fin. A fixing recess is defined over the extension arms of the second fins. The fan includes a frame extending downwardly out a plurality of legs and radially out a fixing arm. The legs have hooks engaging in the engaging grooves, and the fixing arm is fixed in the fixing recess.

1 . A heat dissipation apparatus, comprising:
 a heat sink defining a recessed space at a center of a top end thereof, an upper portion of the heat sink surrounding the recessed space, at least one fixing recess being defined in a top end of the upper portion and at least one engaging groove being defined in an inner side of the upper portion, the at least one fixing recess and the at least one engaging groove communicating with the recessed space; and   a fan comprising a frame and an impeller assembled to the frame, the frame extending downwardly out a plurality of legs and radially out at least one fixing arm, each of the legs comprising a hook at a free end thereof, the hooks of the legs engaging in the at least one engaging groove of the heat sink, and the at least one fixing arm being fixed in the at least one fixing recess, for securely mounting the fan in the recessed space of the heat sink.   
   
   
       2 . The heat dissipation apparatus of  claim 1 , wherein the heat sink comprises a pair of first fin assemblies and a pair of second fin assemblies alternate with the pair of first fin assemblies, the first and second fin assemblies cooperatively forming an annular structure, the first fin assemblies and the second fin assemblies each comprising a plurality of fins, each fin comprising a main body and an extension arm extending upwardly from the main body, the extension arms of the first and second fin assemblies cooperatively forming the upper portion of the heat sink, a height of the extension arm of each fin of the second fin assembly being less than that of the extension arm of each fin of the first fin assembly, the at least one fixing recess being defined between the pair of first fin assemblies and over the extension arms of the fins of each second fin assembly. 
   
   
       3 . The heat dissipation apparatus of  claim 2 , wherein a width of each extension arm of the first and second fin assemblies is less than that of each main body of the first and second fin assemblies, the extension arms of the first and second fin assemblies cooperatively forming the recessed space therebetween, the engaging groove being defined in at least one extension arm of the first and second fin assemblies. 
   
   
       4 . The heat dissipation apparatus of  claim 2 , further comprising at least one heat pipe with an arcuate condensation section, the first and second fin assemblies each defining at least one receiving groove therein, the second fin assemblies each further defining an opening at an outer-down side thereof in communication with the at least one receiving groove of a corresponding second fin assembly, a part of the condensation section of the at least one heat pipe being inserted into the at least one receiving groove of each first fin assembly, and another part thereof entering into the at least one receiving groove of each second fin assembly through the opening of the corresponding second fin assembly. 
   
   
       5 . The heat dissipation apparatus of  claim 1 , wherein the frame comprises an annular rim, the legs extending downwardly and the at least one fixing arm extending radially out from the rim, the heat sink forming a step above the at least one engaging groove in the recessed space, the rim sitting on the step. 
   
   
       6 . The heat dissipation apparatus of  claim 5 , wherein the heat sink comprises a pair of first fin assemblies and a pair of second fin assemblies alternate with the pair of first fin assemblies, the first fin assemblies each comprising a plurality of first fins stacked along a circumferential direction of the heat sink, the second fin assemblies each comprising a plurality of second fins stacked along the circumferential direction of the heat sink, the step being formed on each of the first fin assemblies, each of the first fins extending perpendicularly and horizontally out a step flange from the step, all the step flanges of the first fins of each first fin assembly cooperatively forming a step surface, each of the second fins extending perpendicularly and horizontally out a top flange at a top end thereof, all the top flanges of the second fins of each second fin assembly cooperatively forming a top surface, the top surface of each second fin assembly being coplanar with the step surface of each first fin assembly, the rim of the fan sitting on the top surface of each second fin assembly and the step surface of each first fin assembly, the at least one fixing arm abutting the top surface of the each second fin assembly. 
   
   
       7 . A heat dissipation apparatus, comprising:
 a heat sink comprising a plurality of radial fins, each of the fins comprising a main body and an extension arm extending upwardly from the main body, a width of each extension arm of the fins being less than that of each main body of the fins, the main bodies and the extension arms of the fins cooperatively forming a space therebetween, the extension arms of the fins defining at least one engaging groove communicating with the space, the extension arms of a part of the fins protruding upwardly out from the extension arms of the other part of the fins, such that at least one fixing recess being defined at a top end of the heat sink; and   a fan comprising a frame and an impeller assembled to the frame, the frame extending downwardly out a plurality of legs and radially out at least one fixing arm, each of the legs comprising a hook at a free end thereof, the hooks of the legs engaging in the at least one engaging groove of the heat sink, and the at least one fixing arm being fixed in the at least one fixing recess, for securely mounting the fan in the space of the heat sink.   
   
   
       8 . The heat dissipation apparatus of  claim 7 , wherein the fins comprise a plurality of first fins and a plurality of second fins, the first fins being stacked together to cooperatively form a pair of first fin assemblies, the second fins being stacked together to cooperatively form a pair of second fin assemblies, the first fin assemblies being alternate with the second fin assemblies to form an annular structure, the extension arms of the first fins of the first fin assemblies protruding upwardly beyond the extension arms of the second fins the second fin assemblies. 
   
   
       9 . The heat dissipation apparatus of  claim 8 , wherein the frame comprises an annular rim, the legs extending downwardly and the at least one fixing arm extending radially out from the rim, each extension arm of the first fins of the first fin assemblies forming a step above the at least one engaging groove in the space, the rim sitting on the steps of the first fin assemblies. 
   
   
       10 . The heat dissipation apparatus of  claim 9 , wherein each of the first fins extending perpendicularly out a step flange from the step, all the step flanges of the first fins of each first fin assembly cooperatively forming a step surface, each of the second fins extending perpendicularly and horizontally out a top flange at a top end thereof, all the top flanges of the second fins of each second fin assembly cooperatively forming a top surface, the top surface of each second fin assembly being coplanar with the step surface of each first fin assembly, the rim of the fan sitting on the top surface of each second fin assembly and the step surface of each first fin assembly, the at least one fixing arm abutting the top surface of the each second fin assembly. 
   
   
       11 . The heat dissipation apparatus of  claim 8 , further comprising at least one heat pipe with an arcuate condensation section, the first and second fin assemblies each defining at least one receiving groove therein, the second fin assemblies each further defining an opening at an outer-down side thereof in communication with the at least one receiving groove of the corresponding second fin assembly, a part of the condensation section of the at least one heat pipe being inserted into the at least one receiving groove of each first fin assembly, and another part thereof entering into the at least one receiving groove of each second fin assembly through the opening of the corresponding second fin assembly.