Compact diagonal fan

Abstract

The invention relates to a diagonal fan having a housing, an impeller driven by an electric motor whose hub together with an air conduction sleeve surrounding the impeller defines an essentially annular flow channel having an air intake opening and an air exit opening. The hub takes the form of a truncated cone that widens towards the air exit opening, the air conduction sleeve being essentially profiled, the electric motor being held in the housing by means of bridges that essentially extend in a radially outwards direction. The invention is characterized by the fact that the bridges to secure the motor are arranged in the region of the air intake opening of the flow channel.

1 . A diagonal fan having a housing ( 10 ), an impeller ( 14 ) driven by an electric motor ( 11 ) whose hub ( 12 ) together with an air conduction sleeve ( 17 ) surrounding the impeller defines an essentially annular flow channel ( 18 ) having an air intake opening ( 19 ) and an air exit opening ( 20 ), the hub ( 12 ) taking the form of a truncated cone that widens towards the air exit opening ( 20 ), and the air conduction sleeve ( 17 ) being essentially profiled, the electric motor ( 11 ) being held in the housing ( 10 ) by means of bridges ( 16 ) that essentially extend in a radially outwards direction, characterized in that, 
 the bridges ( 16 ) are arranged in the region of the air intake opening ( 19 ) of the flow channel ( 18 ).    
   
   
       2 . A diagonal fan according to  claim 1 , characterized in that the blades ( 13 ) of the impeller ( 14 ) are fixed in the region where the diameter of the hub ( 12 ) is at its largest.  
   
   
       3 . A diagonal fan according to  claim 1 , characterized in that the impeller ( 14 ) is arranged in the region of the air exit opening ( 20 ) of the flow channel ( 18 ).  
   
   
       4 . A diagonal fan according to  claim 1 , characterized in that the cross-section of the flow channel ( 18 ) with respect to the rotational axis ( 15 ) of the impeller ( 14 ) extends radially outwards at an acute angle.  
   
   
       5 . A diagonal fan according to  claim 1 , characterized in that the cross-section of the flow channel ( 18 ) decreases in the direction of the air exit opening ( 20 ).  
   
   
       6 . A diagonal fan according to  claim 1 , characterized in that the diameter of the air conduction sleeve ( 17 ) widens towards the air exit opening ( 20 ).  
   
   
       7 . A diagonal fan according to  claim 1 , characterized in that the profiled surface of the air conduction sleeve ( 17 ) has an outwardly rounded intake radius ( 21 ) at the air intake opening ( 19 ).  
   
   
       8 . A diagonal fan according to  claim 1 , characterized in that the electric motor ( 11 ) is an outer rotor motor whose stationary part is held to the housing ( 10 ) and whose rotor forms the hub ( 12 ) with the impeller ( 14 ).