Air fan

Abstract

The present invention provides air fans with enhanced oscillating mechanism. In one aspect of this invention, the air fan comprises main propeller ( 19 ), a main motor ( 24 ) operably connected to the main propeller ( 19 ), driving the main propeller ( 19 ) to rotate to generate air stream, and a wind guide device composed of a wind guard plate ( 35 ) and a wind reject plate ( 21 ) and surrounding the main propeller ( 19 ). An auxiliary motor ( 53 ) operably connected to the wind guide device via a rotation-oscillation shifting device, for driving the wind guide device to oscillate to change the wind direction. In a further aspect of this invention, only the motor for the oscillating mechanism is in motion to drive the relatively lighter wind channel while the enclosure and motor for the wind wheel remain static during operation. The air fans feature less safety hazard, a prolonged service life, a lower noise and easier operation.

1 . An air fan, comprising: 
 a main propeller ( 19 );    a main motor ( 24 ) operably connected to the main propeller ( 19 ), driving the main propeller ( 19 ) to rotate to generate air stream;    characterized in that the fan further comprises a wind guide device composed of a wind guard plate ( 35 ) and a wind reject plate ( 21 ) and surrounding the main propeller ( 19 ), a gap is provided between the wind guard plate ( 35 ) and the wind reject plate ( 21 ) for facilitating flowing out of air, and an auxiliary motor ( 53 ) is operably connected to the wind guide device via a rotation-oscillation shifting device, for driving the wind guide device to oscillate to change the wind direction.    
   
   
       2 . The air fan as of  claim 1 , characterized in that it further comprises an ion generator ( 85 ).  
   
   
       3 . The air fan of  claim 1 , characterized in that it further comprises a water filter.  
   
   
       4 . The air fan of  claim 2 , characterized in that it further comprises a water filter.  
   
   
       5 . The air fan of any one of  claim 14 , characterized in that it further comprises an enclosure in which the main propeller ( 19 ) and the wind guide device are both disposed.  
   
   
       6 . The air fan of any one of claims  1 - 4 , characterized in that the rotation-oscillation shifting device is a crank and rocker mechanism.  
   
   
       7 . The air fan of  claim 5 , characterized in that the rotation-oscillation shifting device is a crank and rocker mechanism.  
   
   
       8 . An air fan, comprising an enclosure ( 4 ′), a wind wheel ( 13 ′), a main motor ( 1 ′) which drives the wind wheel ( 13 ′) to generate air, a wind channel ( 12 ′) which delivers air out of the rotating wind wheel and an oscillating mechanism ( 15 ′,  16 ′,  17 ′), wherein during operation, the motor for the oscillating mechanism is in motion to drive the wind channel ( 12 ′) while the enclosure ( 4 ′) and the main motor ( 1 ′) remain static.  
   
   
       9 . The air fan of  claim 8 , wherein the holder ( 2 ′) of the main motor ( 1 ′) is secured to the front enclosure ( 4 ′).  
   
   
       10 . The air fan of  claim 8 , wherein the screws for securing the holder ( 2 ′) are placed at the bottom of the front enclosure ( 4 ′) and the main motor ( 1 ′) is secured to the said front enclosure by means of the holder ( 2 ′).  
   
   
       11 . The air fan of  claim 8 , wherein the oscillating mechanism ( 15 ′,  16 ′,  17 ′) comprises a second motor ( 17 ′), a crank ( 16 ′) and a connecting-lever ( 15 ′), and the second motor ( 17 ′) is secured to the enclosure ( 4 ′); and 
 the second motor ( 17 ′) drives the crank ( 16 ′) in rotation with the connecting-lever ( 15 ′) which then drives the wind channel ( 12 ′) to achieve reciprocating oscillation.    
   
   
       12 . The air fan of  claim 8 , wherein the bottom of the wind channel ( 12 ′) is secured to the holder ( 2 ′) of the main motor ( 1 ′) by means of ball sliding, and the wind channel ( 12 ′) slides horizontally during operation on the plane of the holder ( 2 ′).  
   
   
       13 . The tower-type electric fan of  claim 8 , wherein a shaft ( 10 ′) is tightly fastened to the upper end of the said wind channel ( 12 ′), and the shaft ( 10 ′) is clamped to the top of the enclosure ( 4 ′) by means of a vibration isolating rubber ( 9 ′), a shaft bushing ( 11 ′) and a ball ( 8 ′).  
   
   
       14 . The tower-type electric fan of  claim 11 , wherein a sleeve shaft ( 22 ′) is made on the lower plane of the said wind channel ( 12 ′), and an oscillating shaft ( 21 ′) is tightened to the sleeve shaft ( 22 ′); and 
 a plastic bushing ( 20 ′) secured to the oscillating shaft ( 21 ′) is flexibly connected to the connecting lever ( 15 ′) of the oscillating mechanism ( 15 ′,  16 ′,  17 ′).    
   
   
       15 . The tower-type electric fan of  claim 8 , a first hole ( 34 ′) is made on the holder ( 2 ′) of the main motor ( 1 ′) and a second hole ( 28 ′) is made on the lower plane of the wind channel ( 12 ′); 
 a round ring ( 29 ′) is made on the second hole ( 28 ′) and a track ( 30 ′) is put on the round ring ( 29 ′);    a ball ring ( 31 ′) containing balls ( 30 ′) is attached to the bottom of the track ( 30 ′); and    the main motor ( 1 ′) is secured to the bushing ( 26 ′) of the said wind wheel ( 13 ′) after it extends through the first hole ( 34 ′), the ball ring ( 31 ′), the track ( 30 ′) and the second hole ( 30 ′).    
   
   
       16 . The tower-type electric fan of  claim 8 , wherein the motor shaft ( 27 ′) between the main motor ( 1 ′) and the wind wheel ( 13 ′) is shorter in length than the shaft ( 21 ′) between the second motor ( 17 ′) and the wind channel ( 12 ′).  
   
   
       17 . The tower-type electric fan of  claim 8 , wherein the main motor ( 1 ′) is close to the wind wheel ( 13 ′).  
   
   
       18 . The tower-type electric fan of  claim 11 , the main motor ( 1 ′) lies between the second motor ( 17 ′) and the wind wheel ( 13 ′).