Propeller Blower, Shell Propeller

Abstract

The invention relates to a propeller blower for axial outflow of suctioned air by means of an impeller disk ( 2 ) which is adjacent to the inside of the flow channel, said impeller disk comprising convex blades ( 1 ). The blades ( 1 ) are embodied as shell blades with elongate extensions. An end region ( 20 ) is connected to the impeller disk ( 2 ) in the area of penetration. The other end ( 21 ) extends in radial manner towards the outside and has increasing radial distances with the axial components in the direction of flow.

1 . Propeller blower for substantially axial outflow of sucked in air with an impeller disk ( 2 ) rotary driven around an axis of rotation ( 3 ) and limiting the flow channel on the inside, comprising blades ( 1 ) which are, viewed in the blade area between blade entrance edge ( 22 ) and blade discharge edge, bent in flow direction ( 30 ), characterised in that each blade ( 1 ) is formed in the shape of an oyster shell having a longitudinal extension, the end portion ( 20 ) of which is connected with the impeller disk ( 2 ) in form of a penetration ( 6 ), and the other, free end portion ( 21 ) of which extends radially outwards and with increasing radial distance with an axial component in flow direction, and that the blades ( 1 ) are bent towards the circumferential direction ( 5 ) of the rotary drive of the impeller disk ( 2 ). 
   
   
       2 . Propeller blower according to  claim 1 , characterised in that the conveying blades ( 1 ) are arranged almost perpendicularly to the vector of the direction of rotation in the vicinity of the axis of rotation ( 3 ) and the entrance edges ( 22 ) of the blades are bent from the inside to the outer edge concavely to the direction of rotation ( 5 ). 
   
   
       3 . Propeller blower according to  claim 1 , characterised in that the radially inner extensions of the blades have a radial distance to the axis of rotation ( 3 ), and the dedendum line ( 6 ) points past the axis of rotation ( 3 ) in the direction of rotation. 
   
   
       4 . Propeller blower according to  claim 1 , characterised in that an indentation ( 4 ) is formed on the impeller disk ( 2 ) in the area before the dedendum line ( 6 ). 
   
   
       5 . Propeller blower according to  claim 2 , characterised in that the radially inner extensions of the blades have a radial distance to the axis of rotation ( 3 ), and the dedendum line ( 6 ) points past the axis of rotation ( 3 ) in the direction of rotation. 
   
   
       6 . Propeller blower according to  claim 2 , characterised in that an indentation ( 4 ) is formed on the impeller disk ( 2 ) in the area before the dedendum line ( 6 ). 
   
   
       7 . Propeller blower according to  claim 3 , characterised in that an indentation ( 4 ) is formed on the impeller disk ( 2 ) in the area before the dedendum line ( 6 ). 
   
   
       8 . Propeller blower according to  claim 5 , characterised in that an indentation ( 4 ) is formed on the impeller disk ( 2 ) in the area before the dedendum line ( 6 ). 
   
   
       9 . Propeller blower according to  claim 6 , characterised in that an indentation ( 4 ) is formed on the impeller disk ( 2 ) in the area before the dedendum line ( 6 ).