Heat dissipation device having a fan thereon

Abstract

A heat dissipation device includes a heat sink and a blower. The heat sink has a base and a plurality of fins formed on the base. The blower includes a frame and an impeller rotatably secured to the frame. The frame faces and is secured to the base of the heat sink to define an airflow passage between the base of the heat sink and the blower. An airflow inlet is defined through the frame of the blower. Another airflow inlet is defined through the base of the heat sink. An airflow produced by the blower passes through the airflow passage via the airflow inlets and then blows towards channels defined between the fins of the heat sink.

1 . A heat dissipation device comprising:
 a heat sink comprising a base and a plurality of fins formed on the base; and   a blower comprising a frame and an impeller rotatably secured to the frame, the frame directly facing and mounted to the base of the heat sink to define an airflow passage between the base of the heat sink and the frame, the frame defining an airflow inlet therethrough;   wherein airflow produced by the blower flows into the airflow passage via the airflow inlet and blows towards channels defined between the fins of the heat sink from an outlet of the blower.   
     
     
         2 . The heat dissipation device of  claim 1 , wherein the base of the heat sink defines another airflow inlet therethrough. 
     
     
         3 . The heat dissipation device of  claim 2 , wherein the frame of the blower comprises a panel plate and a sidewall extending from a periphery thereof and engaging the base of the heat sink to secure the frame to the base of the heat sink. 
     
     
         4 . The heat dissipation device of  claim 3 , wherein the impeller is located between the panel plate and the base. 
     
     
         5 . The heat dissipation device of  claim 4 , wherein the impeller is secured to a bottom surface of the panel plate and surrounded by the sidewall. 
     
     
         6 . The heat dissipation device of  claim 3 , wherein the frame of the blower comprises a plurality of mounting poles extending from the sidewall thereof, fasteners extending through the mounting poles of the frame of the blower and screwing into the base of the heat sink to mount the blower on the base of the heat sink. 
     
     
         7 . The heat dissipation device of  claim 6 , wherein the base of the heat sink comprises a plurality of fixing portions in alignment with the mounting poles of the frame of the blower, the fasteners extending through the mounting poles and screwing into the fixing portions of the base of the heat sink. 
     
     
         8 . The heat dissipation device of  claim 1 , wherein the base of the heat sink corresponding to the fins is inclined downwardly to guide the airflow of the blower to flow downwardly away from the heat dissipation device. 
     
     
         9 . The heat dissipation device of  claim 8 , wherein the fins of the heat sink have gradually decreased lengths from one of two opposite lateral sides of the base of the heat sink to another of the two opposite lateral sides. 
     
     
         10 . The heat dissipation device of  claim 9 , wherein the fins of the heat sink define a recessed slot in a top thereof and a guiding plate covers the fins and has a portion received in the recessed slot. 
     
     
         11 . A heat dissipation device comprising:
 a heat sink having a base and a plurality of fins extending upwardly from the base;   a blower covering the base of the heat sink, the blower comprising a frame facing and mounted to the base of the heat sink and an impeller rotatably secured to the frame, the frame cooperating with the base to define an airflow passage between the frame and the base, an airflow inlet being defined in the frame of the blower;   wherein an airflow produced by the blower passes through the airflow passage via the airflow inlet and blows towards channels defined between the fins of the heat sink.   
     
     
         12 . The heat dissipation device of  claim 11 , wherein base of the heat sink defines another airflow inlet therethrough. 
     
     
         13 . The heat dissipation device of  claim 12 , wherein the base of the heat sink beneath the fins is inclined downwardly to guide the airflow to flow downwardly when the airflow leaves the heat dissipation device.