Fan assembly for vacuum cleaner

Abstract

The present invention relates to a fan assembly for a vacuum cleaner for reducing BPF noises. The fan assembly includes a motor, an impeller having a plurality of impeller blades, the impeller being rotated by the motor to suck air, and a diffuser disposed to wrap around an outer circumference of the impeller, the diffuser having a plurality of diffuser blades arranged in a predetermined interval. A ratio of an exit area of the diffuser to an entrance area of the diffuser is determined to reduce noise generated when the impeller rotates.

1 . A fan assembly for a vacuum cleaner comprising: 
 a motor,    an impeller having a plurality of impeller blades, the impeller being rotated by the motor to suck air, and    a diffuser disposed to wrap around an outer circumference of the impeller, the diffuser having a plurality of diffuser blades arranged at a predetermined interval;    wherein a ratio of an exit area of the diffuser to an entrance area of the diffuser is set to reduce noise generated when the impeller rotates.    
   
   
       2 . The fan assembly for the vacuum cleaner of  claim 1 , wherein the ratio of the exit area of the diffuser to the entrance area of the diffuser satisfies a formula:  
     
       
         
           
             0.51 
             ≤ 
             
               DI 
               DO 
             
             ≤ 
             0.62 
           
         
       
     
     where DI is the entrance area of the diffuser, and DO is the exit area of the diffuser.  
   
   
       3 . The fan assembly for the vacuum cleaner of  claim 2 , wherein the diffuser is formed to satisfy the formula by controlling a number of the diffuser blades.  
   
   
       4 . The fan assembly for the vacuum cleaner of  claim 2 , wherein the diffuser is formed to satisfy the formula by controlling an inclined angle of each entrance of the plurality of diffuser blades.  
   
   
       5 . The fan assembly for the vacuum cleaner of  claim 1 , wherein the ratio is also set to minimize a decrease in a suction force produced by the fan assembly.  
   
   
       6 . The fan assembly for the vacuum cleaner of  claim 5 , wherein the ratio is approximately 0.51 and greater.