Heat-dissipating fan

Abstract

A heat-dissipating fan for electronic equipment has a frame, a stator, an impeller, a top cover and an enlarged discharge port. The frame has a bottom, a sidewall and a volute. The sidewall is formed on the bottom and has an open front and a top surface that is either parallel to or diverges from the bottom of the frame toward the open front. The volute is defined inside the sidewall. The stator is mounted on the bottom in the frame. The impeller is mounted rotatably on the stator inside the frame. The top cover is mounted on the sidewall and has an inlet and an optional recessed segment. The enlarged discharge port reduces the back pressure on air passing through the volute.

1 . A heat-dissipating fan comprising: 
 a frame having 
 a bottom having 
 an inside surface; and  
 an outer edge;  
 
 a sidewall formed flush with the outer edge on and extending up from the inside surface of the bottom and having 
 a top surface,  
 a left side,  
 a right side,  
 a back and  
 an open front; and  
 
 a volute formed inside the sidewall and communicating with the open front of the sidewall and having 
 a height defined between the bottom surface of the top cover and the inside surface of the bottom of the frame;  
 
   a stator mounted securely on the inside surface of the bottom of the frame inside the volute and close to the right side of the sidewall;    an impeller mounted rotatably on the stator inside the volute and having multiple blades;    a top cover mounted on the top surface of the sidewall and having 
 a front edge;  
 a bottom surface; and  
 an inlet defined through the top cover and communicating with the volute; and  
   an enlarged discharge port formed from the open front of the sidewall and the top cover, communicating with the volute and having 
 a height defined between the front edge of the top cover and the inside surface of the bottom of the frame and larger than the height of the volute.  
   
   
   
       2 . The heat-dissipating fan as claimed in  claim 1 , wherein 
 the top surface of the sidewall diverges from the bottom of the frame toward the open front.    
   
   
       3 . The heat-dissipating fan as claimed in  claim 1 , wherein 
 the top surface of the sidewall is parallel with the bottom of the frame; and    the bottom surface of the top cover has a recessed segment formed adjacent to the inlet.    
   
   
       4 . The heat-dissipating fan as claimed in  claim 1 , wherein 
 the right side of the sidewall of the frame is open and communicates with the volute to form a discharge port.    
   
   
       5 . The heat-dissipating fan as claimed in  claim 1 , wherein 
 the sidewall further has multiple mounting protrusions formed on the top surface of the sidewall; and    the top cover further has multiple mounting holes defined through the top cover, corresponding to and respectively holding the mounting protrusions of the sidewall.    
   
   
       6 . The heat-dissipating fan as claimed in  claim 2 , wherein 
 the right side of the sidewall of the frame opens and communicates with the volute to form a discharge port.    
   
   
       7 . The heat-dissipating fan as claimed in  claim 3 , wherein 
 the right side of the sidewall of the frame opens and communicates with the volute to form a discharge port.    
   
   
       8 . The heat-dissipating fan as claimed in  claim 3 , wherein the number of the recessed segment is two and the recessed segments becoming progressively deeper as the segments approach the open front.