Fan module

Abstract

The invention relates to a fan module, comprising a fan impeller having an axial inlet side and a radial outlet side, an electric motor for coaxially driving the fan impeller, and a cooling air guide that leads from the outlet side to the electric motor. From the electric motor, the cooling air guide further leads to the fan impeller, wherein the fan impeller has, in a region close to the axis, a cut-out for the passage of cooling air to the inlet side.

1 . A fan module ( 100 ), comprising:
 a fan wheel ( 105 ) having an axial inlet side ( 185 ) and a radial outlet side ( 190 ),   an electric motor ( 110 ) for driving the fan wheel ( 105 ) in a coaxial manner, the electric motor having an axis of rotation, and   a cooling air ducting ( 180 ) that leads from the outlet side ( 190 ) to the electric motor ( 110 ), characterized in that   the cooling air ducting ( 180 ) leads from the electric motor ( 110 ) onwards to the fan wheel ( 105 ) and the fan wheel ( 105 ) comprises a cut-out ( 135 ) in a region near to the axis for allowing cooling air to pass through to the inlet side ( 185 ).   
     
     
         2 . The fan module ( 100 ) as claimed in  claim 1 , wherein the electric motor ( 110 ) is a commutated direct current motor having brushes ( 150 ) and the cooling air ducting ( 180 ) extends from the outlet side ( 190 ) to the brushes ( 150 ) and from there in an axial direction to the fan wheel ( 105 ). 
     
     
         3 . The fan module ( 100 ) as claimed in  claim 2 , wherein a diverting element ( 405 ) for diverting the cooling air in the axial direction of the fan wheel ( 105 ) is provided in a region of the brushes ( 150 ). 
     
     
         4 . The fan module ( 100 ) as claimed in  claim 2 , wherein the cooling air ducting ( 180 ) extends axially through the electric motor ( 110 ). 
     
     
         5 . The fan module ( 100 ) as claimed in  claim 2 , wherein the brushes ( 150 ) are spaced from one another and the cooling air ducting ( 180 ) comprises a diverting element ( 410 ) for guiding a part flow of cooling air to each of the brushes ( 150 ). 
     
     
         6 . The fan module ( 100 ) as claimed in  claim 1 , wherein the cooling air ducting ( 180 ) extends between the outlet side ( 190 ) and the electric motor ( 110 ) along a plane that includes the axis of rotation ( 115 ) of the electric motor ( 110 ). 
     
     
         7 . The fan module ( 100 ) as claimed in  claim 1 , wherein a base plate ( 165 ) having a cut-out ( 170 ) for allowing cooling air to pass through axially from the outlet side ( 190 ) into the cooling air ducting ( 180 ) is provided in a plane of rotation between the electric motor ( 110 ) and the fan wheel ( 105 ). 
     
     
         8 . The fan module ( 100 ) as claimed in  claim 7 , wherein a vane ( 175 ) that extends in an axial direction is provided on a border of the cut-out ( 170 ). 
     
     
         9 . The fan module ( 100 ) as claimed in  claim 1 , wherein the fan wheel ( 105 ) comprises a multiplicity of axial cut-outs ( 135 ) for allowing cooling air to pass to the inlet side ( 185 ). 
     
     
         10 . The fan module ( 100 ) as claimed in  claim 1 , wherein the fan wheel ( 105 ) comprises a dome-like base plate ( 130 ) that faces the electric motor ( 110 ) in an axial manner.