Fan

Abstract

The invention relates to a fan for producing a fluid flow, particularly an air flow. The problem of the invention is to provide a fan for a heatable fluid flow, in which the necessary energy consumption is reduced. A fan according to the invention has an impeller, which has at least one blade for delivering the fluid. On at least part of the blades of the fan impeller is provided at least one heating element used for heating the fluid during the delivery operation of the fan.

1 . Fan, with an impeller and at least one blade for delivering a fluid, wherein at least one heating element ( 15 ) for heating the delivered fluid is provided on at least one part of the blades ( 13 ).  
     
     
         2 . Fan according to  claim 1 , wherein heating elements ( 15 ) are constructed as electrical heating elements and are chosen from the group of thick film heaters, strip heaters and electrically conductive ceramics.  
     
     
         3 . Fan according to  claim 1 , wherein heaters ( 15 ) are placed on the surface of the blades ( 13 ).  
     
     
         4 . Fan according to  claim 3 , wherein the heating elements ( 15 ) are located in heating element channels constructed on the blade side.  
     
     
         5 . Fan according to  claim 1 , wherein the heating elements ( 15 ) are constructed in such a way that they supplement the blades ( 13 ) so that a projection-free, smooth surface contour is formed.  
     
     
         6 . Fan according to  claim 1 , wherein the heating elements ( 15 ) are placed roughly along and parallel to the leading edge of the blades ( 13 ) in the rotor rotation direction.  
     
     
         7 . Fan according to  claim 1 , wherein a temperature sensor ( 16 ) is placed on at least part of the blades ( 13 ).  
     
     
         8 . Fan according to  claim 7 , wherein, considered in the blade rotation direction, the temperature sensor ( 16 ) is placed behind a heating element ( 15 ).  
     
     
         9 . Fan according to  claim 7 , wherein the temperature sensors ( 16 ) are placed on blades ( 13 ) having at least one heating element ( 15 ).  
     
     
         10 . Fan according to  claim 1 , wherein the heaters are combined into at least two groups, the heating capacity preferably being controlled or regulated by switching on or off groups of heaters ( 15 ).  
     
     
         11 . Fan according to  claim 10 , wherein the heaters ( 15 ) of a blade ( 13 ) are associated within the same group.  
     
     
         12 . Fan according to  claim 1 , wherein it is part of an axial-flow fan.  
     
     
         13 . Fan according to one of the  claim 1 , wherein it is part of a radial-flow fan.  
     
     
         14 . Fan according to  claim 13 , wherein the electrical contacting of the heaters ( 15 ) takes place in that blades ( 13 ) with heaters ( 15 ) located thereon produce an electrical connection between two impellers ( 12 ) of the radial-flow fan and consequently are supplemented to form circuits.  
     
     
         15 . Fan according to claims  13 , wherein blades ( 13 ) comprise a base structure, which at least zonally is coated with a thick film heating element.  
     
     
         16 . Use of a fan according to  claim 1  in a domestic appliance.  
     
     
         17 . Use of a fan according to claims  1  in a device of the group composed of baking ofen, particularly a hot air baking oven, spin/tumbler dryer, hand dryer.  
     
     
         18 . Use of a fan according to  claim 1  in vane pumps and blowers in motor vehicles.