Extraction fan and rotor

Abstract

An extraction fan rotor including a hub and a plurality of vanes extending radially therefrom, wherein said vanes have an aerofoil profile in cross-section.

1 . An extraction fan rotor, said rotor including a hub and a plurality of vanes extending radially therefrom, wherein said vanes have an aerofoil profile in cross-section. 
     
     
         2 . The extraction fan rotor of  claim 1 , wherein said aerofoil corresponds to a Selig aerofoil profile. 
     
     
         3 . The extraction fan rotor of  claim 2 , wherein said aerofoil corresponds to a Selig SG6043 aerofoil profile. 
     
     
         4 . The extraction fan rotor of  claim 1 , wherein the angle of attack of the vane increases with distance from the center of the rotor. 
     
     
         5 . The extraction fan rotor of  claim 1 , wherein the hub has a hemispherical profile. 
     
     
         6 . The extraction fan rotor of  claim 5 , wherein the leading edges of the vanes are coplanar with the apex of the hemispherical profile of the hub. 
     
     
         7 . An extraction fan comprising a rotor, said rotor including a hub and a plurality of vanes radially extending therefrom, wherein said vanes have an aerofoil profile in cross section. 
     
     
         8 . The extraction fan of  claim 7 , said fan including a stator, wherein said stator includes a core and a plurality of vanes extending radially therefrom. 
     
     
         9 . The extraction fan of  claim 8 , wherein a cross sectional profile of said hub is approximately parabolic, and is operably arranged such that the diameter of said hub decreases in the direction of air flow. 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . The extraction fan rotor of  claim 2 , wherein the angle of attack of the vane increases with distance from the center of the rotor. 
     
     
         13 . The extraction fan rotor of  claim 3 , wherein the angle of attack of the vane increases with distance from the center of the rotor. 
     
     
         14 . The extraction fan rotor of  claim 2 , wherein the hub has a hemispherical profile. 
     
     
         15 . The extraction fan rotor of  claim 3 , wherein the hub has a hemispherical profile. 
     
     
         16 . The extraction fan of  claim 7 , wherein said aerofoil corresponds to a Selig aerofoil profile. 
     
     
         17 . The extraction fan of  claim 7 , wherein said aerofoil corresponds to a Selig SG6043 aerofoil profile. 
     
     
         18 . The extraction fan of  claim 7 , wherein the angle of attack of the vane increases with distance from the center of the rotor. 
     
     
         19 . The extraction fan of  claim 7 , wherein the hub has a hemispherical profile.