Heat dissipation device with fan

Abstract

A heat dissipation device includes a heat sink, a fan mounted on a top side of the heat sink and an engaging member mounted on the heat sink. The engaging member includes an engaging portion and an elastic member. The engaging portion includes an extending portion and a pressing portion extending from an end of extending portion. The extending portion is slidably mounted on a fin of the heat sink. The elastic member is positioned around the extending portion and sandwiched between the fin and the pressing portion. The elastic member is compressed and offers a resilient force pushing the pressing portion to move towards the fan and press a side of the fan.

1 . A heat dissipation device comprising:
 a heat sink;   a fan mounted on a top side of the heat sink; and   an engaging member comprising an engaging portion and an elastic member, the engaging portion comprising an extending portion and a pressing portion extending from an end of the extending portion, the extending portion slidably mounted on the heat sink, the elastic member positioned around the extending portion and sandwiched between a first fin of the heat sink and the pressing portion;   wherein the elastic member is compressed between the first fin of the heat sink and the pressing portion to provide a resilient force which pushes the pressing portion to move towards the fan and press a side of the fan.   
   
   
       2 . The heat dissipation device as claimed in  claim 1 , wherein the heat sink comprises a base and the first fin extends upwardly from a top surface of the base, and the extending portion of the engaging member is slidably mounted on the first fin. 
   
   
       3 . The heat dissipation device as claimed in  claim 2 , wherein a connecting portion abuts against an outer surface of the first fin, and the engaging portion of the engaging member extends through the first fin and engages with the connecting portion. 
   
   
       4 . The heat dissipation device as claimed in  claim 3 , wherein the connecting portion defines a through hole and a slit at an outmost end thereof to divide the outmost end of the connecting portion into two portions, the slit communicates with the through hole, an end of the extending portion of the engaging member engages in the through hole. 
   
   
       5 . The heat dissipation device as claimed in  claim 4 , wherein the end of the extending portion is recessed to define an engaging groove, the engaging groove is received in the through hole of the connecting portion and the connecting portion firmly engages in the engaging groove. 
   
   
       6 . The heat dissipation device as claimed in  claim 1 , wherein the elastic member is a helical spring. 
   
   
       7 . The heat dissipation device as claimed in  claim 2 , wherein the heat sink further comprises a second fin which is located at an opposite side of the first fin and abuts against another side of the fan. 
   
   
       8 . The heat dissipation device as claimed in  claim 7 , wherein a ridge extends inwardly from an inner surface of the second fin and presses the another side of the fan. 
   
   
       9 . The heat dissipation device as claimed in  claim 8 , wherein the heat sink comprises a plurality of third fins extend upwardly from the top surface of the base, and tops of the third fins support the fan. 
   
   
       10 . The heat dissipation device as claimed in  claim 9 , wherein a baffling portion extends upwardly from a lateral end of an outer one of the third fins and abuts the fan. 
   
   
       11 . A heat dissipation device comprising:
 a heat sink comprises a base and a first fin and a second fin extending upwardly from a top surface of the base;   a fan mounted on a top side of the heat sink and sandwiched between the first and second fins of the heat sink, a side of the fan abutting against an inner surface of the second fin; and   an engaging member comprising an engaging portion and an elastic member, the engaging portion comprising an extending portion and a pressing portion extending from an end of extending portion, the extending portion slidably mounted on the first fin, the elastic member positioned around the extending portion and sandwiched between the first fin and the pressing portion;   wherein the elastic member is compressed between the first fin and the pressing portion to provide a resilient force pushing the pressing portion to move towards the fan and press another side of the fan.   
   
   
       12 . The heat dissipation device as claimed in  claim 11 , wherein the extending portion extends through the first fin and engaging with a connecting portion which abuts against an outer surface of the first fin. 
   
   
       13 . The heat dissipation device as claimed in  claim 12 , wherein the heat sink comprises two first fins aligned with each other, the engaging member comprises two engaging portions and two elastic members, the another engaging member extends through another first fin and engages with another connecting portion, and the pressing portion of the another engaging portion presses the fan. 
   
   
       14 . The heat dissipation device as claimed in  claim 13 , wherein an operating portion connects the two connecting portions and is located at outside of the heat sink, and the operating portion and the two connecting portions are parts of an elastic sheet. 
   
   
       15 . The heat dissipation device as claimed in  claim 11 , wherein an inner surface of the second fin forms a ridge pressing the fan. 
   
   
       16 . The heat dissipation device as claimed in  claim 11 , wherein the heat sink comprises a plurality of third fins extend upwardly from the top surface of the base and positioned between the first and second fins, tops of the third fins support the fan. 
   
   
       17 . The heat dissipation device as claimed in  claim 16 , wherein a baffling portion extends upwardly from a lateral end of an outer one of the third fins and abuts the fan.