Cooling Fan with Dual Rotation Directions

Abstract

A cooling fan with dual rotation directions includes a fan frame unit, a driving control unit and an impeller. The fan frame unit has an air channel having first and second air-guiding openings on two sides of the air channel. A base is disposed between the first and second air-guiding openings. A first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening. The driving control unit has a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit and the driving circuit is electrically connected to the stator and the rotation direction control circuit. The impeller is rotatably coupled with the stator of the driving control unit.

1 . A cooling fan with dual rotation directions, comprising:
 a fan frame unit having an air channel with first and second air-guiding openings on two sides of the air channel, wherein a base is disposed between the first and second air-guiding openings, a first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening;   a driving control unit having a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit, the driving circuit is electrically connected to the stator and the rotation direction control circuit; and   an impeller rotatably coupled with the stator of the driving control unit.   
     
     
         2 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein the fan frame unit comprises a first frame and a second frame detachably assembled to the first frame to form the air channel, the first air-guiding opening is located in the first frame and the second air-guiding opening is located in the second frame, and the base is located in the first frame. 
     
     
         3 . The cooling fan with dual rotation directions as claimed in  claim 2 , wherein both the first stationary blade unit and the second stationary blade unit comprise a plurality of stationary blades. 
     
     
         4 . The cooling fan with dual rotation directions as claimed in  claim 3 , wherein the base is coupled with an inner circumferential wall of the first frame via the stationary blades of the first stationary blade unit. 
     
     
         5 . The cooling fan with dual rotation directions as claimed in  claim 2 , wherein the fan frame unit further comprises a third frame sandwiched between the first frame and the second frame. 
     
     
         6 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein the first stationary blade unit is disposed in a different direction from the second stationary blade unit in a way that the first and second stationary blade units extend in opposite directions from each other in an axial direction of the impeller. 
     
     
         7 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to an axial direction of the impeller is different from that of the stationary blades of the second stationary blade unit. 
     
     
         8 . The cooling fan with dual rotation directions as claimed in  claim 6 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to the axial direction of the impeller is different from that of the stationary blades of the second stationary blade unit. 
     
     
         9 . The cooling fan with dual rotation directions as claimed in  claim 6 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to the axial direction of the impeller is the same as that of the stationary blades of the second stationary blade unit. 
     
     
         10 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein the first stationary blade unit further comprises an air-guiding portion at a center thereof. 
     
     
         11 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein the second stationary blade unit further comprises an air-guiding portion at a center thereof. 
     
     
         12 . The cooling fan with dual rotation directions as claimed in  claim 1 , wherein the driving circuit and the rotation direction control circuit are integrated into an integrated chip.