Dual-effect heat dissipating fan

Abstract

A dual-effect heat dissipating fan comprising an axial flow fan and an eccentric fan is disclosed. The top of the eccentric fan is a dome. The upper end of blades of the eccentric flow fan are aligned with the blade at the lower end in the same axial line so that the two are overlapped and thus. The airflow guided therein will concentrate in this area and then is blown out in an eccentric way; and therefore, the efficiency of heat dissipating is improved.

What is claimed is:  
     
         1 . A dual-effect heat dissipating fan comprising an axial flow fan and an eccentric fan; wherein: 
 an axial flow fan is a round block and a plurality of blades is distributed from a center portion to an outer circumference thereof; thus, the round block is firmly secured to the eccentric fan;    a top of the eccentric fan is a dome; an outer periphery thereof are extended with a plurality of blades; blades is connected to the blades at upper ends; then, a coil and a motor casing are applied thereon; when the fan rotates by driving of the motor; the airflow in the axial flow fan is guided into the eccentric fan along an cambered surface of the dome; by the arrangement of the fan, upper ends of the blades are aligned with the blade at eccentric fan in the same axial line so that the two are overlapped and thus, the airflow guided therein will concentrate in this area and then is blown out in an eccentric way; therefore, the efficiency of heat dissipating is improved.