Fan

Abstract

A fan assembly for generating an air flow within a room includes an annular casing which defines an interior passage. The interior passage includes an air inlet, and houses, downstream from the air inlet, an impeller and a motor for driving the impeller to draw an air flow through the air inlet and into the fan assembly. The interior passage also has an air outlet from which at least a portion of the air flow is emitted from the fan assembly. The annular casing defines a bore about which the interior passage extends and through which a secondary air flow from outside the fan assembly is drawn by the air emitted from the air outlet.

1 . A fan assembly for generating an air flow within a room, the fan assembly comprising an annular casing defining an interior passage with at least one air inlet, the interior passage housing, downstream from said at least one air inlet, an impeller and a motor for driving the impeller to draw an air flow through said at least one air inlet and into the fan assembly, the interior passage also having at least one air outlet from which at least a portion of the air flow is emitted from the fan assembly, the casing defining a bore about which the interior passage extends and through which a secondary air flow from outside the fan assembly is drawn by the air emitted from said at least one air outlet. 
     
     
         2 . The fan assembly of  claim 1 , wherein the interior passage comprises an inlet section comprising said at least one air inlet, and an outlet section located downstream from the inlet section and comprising said at least one air outlet. 
     
     
         3 . The fan assembly of  claim 2 , wherein the inlet section extends about at least part of the outlet section. 
     
     
         4 . The fan assembly of  claim 2 , wherein the outlet section has a cross-section which varies continuously about the bore. 
     
     
         5 . The fan assembly of  claim 2 , wherein the outlet section is continuous. 
     
     
         6 . The fan assembly of  claim 2 , wherein the outlet section has a generally rectangular cross-section. 
     
     
         7 . The fan assembly of  claim 2 , wherein the impeller and the motor are located within the inlet section. 
     
     
         8 . The fan assembly of  claim 7 , wherein the inlet section comprises an impeller housing section which houses the impeller and the motor, and a conduit section extending from said at least one air inlet to the impeller housing section. 
     
     
         9 . The fan assembly of  claim 8 , wherein the conduit section extends about the outlet section. 
     
     
         10 . The fan assembly of  claim 8 , wherein the conduit section is arcuate in shape. 
     
     
         11 . The fan assembly of  claim 8 , wherein said at least one air inlet comprises an air inlet located at one end of the conduit section. 
     
     
         12 . The fan assembly of  claim 1 , wherein the impeller is rotatable about an impeller axis, and the bore has a bore axis, and wherein the bore axis is substantially orthogonal to the impeller axis. 
     
     
         13 . The fan assembly of  claim 1 , wherein the impeller is one of an axial flow impeller and a mixed flow impeller. 
     
     
         14 . The fan assembly of  claim 1 , comprising a diffuser located downstream from the impeller. 
     
     
         15 . The fan assembly of  claim 1 , wherein the casing comprises a first annular side wall defining the bore, a second side wall extending about the first side wall, an upper wall extending between the side walls and a lower wall located opposite to the upper wall. 
     
     
         16 . The fan assembly of  claim 15 , wherein said at least one air outlet is located between the lower wall and the first side wall. 
     
     
         17 . The fan assembly of  claim 1 , wherein said at least one air outlet comprises a circular slot.