Fan wheel

Abstract

A fan wheel comprises a hub and a plurality of blades extending radially outwardly from the hub. A ring is arranged in coaxial relationship with the hub and radially between the hub and the outside periphery of the fan wheel. The ring has a plurality of defined fixing positions distributed over the periphery thereof for mounting at least one balancing weight.

1 . A fan wheel comprising: 
 a hub,    a plurality of blades extending at least substantially radially outwardly from the hub,    a ring arranged in coaxial relationship with the hub and radially between the hub and the outside diameter of the fan wheel, and    on the ring a plurality of defined fixing positions distributed over the periphery thereof for mounting at least one balancing weight.    
   
   
       2 . A fan wheel as set forth in  claim 1   wherein the fixing positions are formed by a profiling of the ring.    
   
   
       3 . A fan wheel as set forth in  claim 2   wherein the blades are spaced in the peripheral direction and wherein the profiling is provided exclusively between the blades.    
   
   
       4 . A fan wheel as set forth in  claim 2   wherein the profiling is in the form of sawtooth profiling at least in peripheral portions of the ring.    
   
   
       5 . A fan wheel as set forth in  claim 2   wherein the profiling is on the radial outside of the ring.    
   
   
       6 . A fan wheel as set forth in  claim 1   wherein the fixing positions are formed by fixing bores distributed over the periphery of the ring.    
   
   
       7 . A fan wheel as set forth in  claim 1   wherein the fixing positions are formed by receiving pockets distributed over the periphery of the ring.    
   
   
       8 . A fan wheel as set forth in  claim 1   wherein the ring is closed in the peripheral direction.    
   
   
       9 . A fan wheel as set forth in  claim 1   wherein the ring is of a diameter which corresponds to half the fan wheel diameter.    
   
   
       10 . A fan wheel as set forth in  claim 1   wherein the blades extend continuously from the hub to the outside diameter of the fan wheel.    
   
   
       11 . A fan wheel as set forth in  claim 1   wherein the hub is in the form of a shaft.    
   
   
       12 . A fan wheel as set forth in  claim 11   wherein said shaft is the shaft of a motor.    
   
   
       13 . A fan wheel as set forth in  claim 1   wherein at least one balancing weight is fixed to the ring.    
   
   
       14 . A fan wheel as set forth in  claim 13   wherein said balancing weight is releasably fixed to the ring.    
   
   
       15 . A fan wheel as set forth in  claim 13   wherein the balancing weight is in the form of a clip.    
   
   
       16 . A fan wheel as set forth in  claim 13   wherein the balancing weight is of complementary form to a peripheral portion of the profiling.    
   
   
       17 . A fan wheel as set forth in  claim 1  including 
 in addition to said ring a second ring arranged in coaxial relationship with the ring.    
   
   
       18 . A fan wheel as set forth in  claim 17   wherein the second ring is a closed ring at the outside periphery of the fan wheel.