Venturi fan

Abstract

A venturi-type fan is composed of a wire basket between front and rear flares. The wire basket has a rear portion to which the motor and fan blade assembly is mounted. The rear flare controls the admission of air into the fan to reduce turbulence and allows the flow of air to be accelerated and directed forward in a slowly diffusing column. The openness of the sides of the present fan reduces the noise generally associated with close-sided venturi fans without degrading air movement characteristics

1 . A fan, comprising: 
 a motor having a shaft;    a fan blade assembly carried by said shaft and rotatable therewith when said motor is operating, said fan blade assembly forming a flow of air when rotating; and    a housing having 
 a rear flare,  
 a side wall having at least one hole formed therein to admit air through said side wall to join said flow of air when said fan blade assembly rotates, and  
 a rear portion for carrying said motor.  
   
   
   
       2 . The fan as recited in  claim 1 , wherein said at least one hole is a multiplicity of holes.  
   
   
       3 . The fan as recited in  claim 1 , wherein said side wall is formed of spaced apart wires.  
   
   
       4 . The fan as recited in  claim 1 , wherein said side wall and said rear portion are formed of a wire basket.  
   
   
       5 . The fan as recited in  claim 1 , wherein said side wall is formed of a helical wire having plural turns, each turn of said plural turns being spaced apart from adjacent turns of said helical wire  
   
   
       6 . The fan as recited in  claim 1 , wherein said side wall is frustoconically shaped.  
   
   
       7 . The fan as recited in  claim 4 , wherein said wire basket is frustoconically shaped.  
   
   
       8 . The fan as recited in  claim 1 , wherein said housing carries a front finger guard.  
   
   
       9 . The fan as recited in  claim 1 , wherein said rear portion surrounds said motor.  
   
   
       10 . The fan as recited in  claim 1 , further comprising means carried by said rear portion for mounting said motor.  
   
   
       11 . The fan as recited in  claim 10 , wherein said mounting means is a set of brackets.