Fan assembly and heat dissipation device having the same

Abstract

A heat dissipation device includes a heat sink, a fan mounted on a top side of the heat sink and a fan holder connecting the heat sink with the fan. The fan includes a blade assembly and a frame enclosing the blade assembly. The fan holder includes a supporting portion engaging with the heat sink. A connecting plate extends upwardly from an edge of the supporting portion. A ridge extends angulately and downwardly from an inner surface of the connecting plate. An operating plate extends downwardly from a bottom end of the connecting plate. The operating plate is pressed inwardly or pulled outwardly to make the ridge of the connecting plate space from or engage with the frame of the fan.

1 . A fan assembly comprising:
 a fan comprising a blade assembly and a frame supporting the blade assembly; and   a fan holder comprising a supporting portion, a connecting plate extending upwardly from an edge of the supporting portion, a ridge extending angulately and downwardly from a top end of the connecting plate, an operating plate extending downwardly from a bottom end of the connecting plate;   wherein the operating plate is pressed inwardly or pulled outwardly to make the ridge of the connecting plate space from or engage with the frame of the fan.   
     
     
         2 . The fan assembly as claimed in  claim 1 , wherein the connecting plate and the operating plate are integrally made of an elastic material. 
     
     
         3 . The fan assembly as claimed in  claim 1 , wherein a pin extends upwardly from a top surface of the supporting portion and extends through the frame of the fan. 
     
     
         4 . The fan assembly as claimed in  claim 1 , wherein an engaging member connects with the supporting portion, the engaging member adapted for engaging with a heat sink. 
     
     
         5 . The fan assembly as claimed in  claim 4 , wherein the engaging member is annular and the supporting portion extends outwardly from a top of the engaging member. 
     
     
         6 . The fan assembly as claimed in  claim 5 , wherein a reinforcing rib is formed at a bottom of the supporting portion and connects with the engaging member. 
     
     
         7 . The fan assembly as claimed in  claim 5 , wherein a plurality of supporting portions are formed at the top of the engaging member. 
     
     
         8 . The fan assembly as claimed in  claim 1 , wherein a through hole is defined in the supporting portion and is adjacent to a joint of the supporting portion and the connecting plate. 
     
     
         9 . A heat dissipation device comprising:
 a heat sink;   a fan mounted on a top side of the heat sink, the fan comprising a blade assembly and a frame enclosing the blade assembly; and   a fan holder comprising a supporting portion engaging with the heat sink, a connecting plate extending upwardly from an edge of the supporting portion, a ridge extending angulately and downwardly from a top end of the connecting plate, an operating plate extending downwardly from a bottom end of the connecting plate;   wherein the operating plate is pressed inwardly or pulled outwardly to make the ridge of the connecting plate space from or engage with the frame of the fan.   
     
     
         10 . The heat dissipation device as claimed in  claim 9 , wherein a pin extends upwardly from a top surface of the supporting portion and through the frame of the fan. 
     
     
         11 . The heat dissipation device as claimed in  claim 10 , wherein an engaging member connects with the supporting portion, and the engaging member encloses a top end of the heat sink therein. 
     
     
         12 . The heat dissipation device as claimed in  claim 9 , wherein the heat sink comprises a heat absorbing portion and a plurality of mounting arms extending outwardly and radially from a periphery of the heat absorbing portion, a screw extends through the supporting portion of the fan holder and engages with a corresponding mounting arm to mount the fan holder on the heat sink. 
     
     
         13 . The heat dissipation device as claimed in  claim 12 , wherein the heat sink comprises a plurality of fins extending outwardly and radially from a periphery of the heat absorbing portion, and a bottom end of the heat absorbing portion is below bottom ends of the fins. 
     
     
         14 . The heat dissipation device as claimed in  claim 13 , wherein each of the fins comprises a connecting plate connected the heat absorbing portion and two angled extending plates extending outwardly from an outmost end of the connecting plate. 
     
     
         15 . The heat dissipation device as claimed in  claim 14 , wherein the fins are divided a plurality of groups and each group of the fins is sandwiched between two adjacent mounting arms.