Blade for a horizontal-axis wind generator

Abstract

The invention relates to a blade for a horizontal-axis wind generator consisting of two flattened bodies which are arranged opposite one another in longitudinal convergence towards the tip without making contact with one another, said bodies being attached by means of an intermediate latticework formed by ties ( 3 ) with an aerodynamic profile, which ties are joined to the flattened bodies by means of hinged attachments providing flexibility to the structural assembly for preventing fatigue fractures.

1 . A blade for a horizontal-axis wind generator of the type formed by a biplane assembly, characterized in that it consists of two essentially equal aerodynamic flattened bodies ( 1 ) and ( 2 ) which are arranged opposite one another, which bodies longitudinally extend in convergence from the blade root to the tip without making contact with one another, with an intermediate latticework for the attachment between said bodies ( 1 ) and ( 2 ) formed by ties ( 3 ) also having an aerodynamic profile, the attachments of said ties ( 3 ) of the intermediate latticework to the flattened bodies ( 1 ) and ( 2 ) being formed by means of hinged attachments providing flexibility. 
     
     
         2 . The blade for a horizontal-axis wind generator according to  claim 1 , characterized in that the oblique ties ( 3 ) of the intermediate latticework are oriented such that the resultant of the aerodynamic forces thereof collaborates in extracting energy from the wind acting on the blade. 
     
     
         3 . The blade for a horizontal-axis wind generator according to  claim 1 , characterized in that according to an embodiment, the attachments between the ties ( 3 ) of the intermediate structure and the flattened bodies ( 1 ) and ( 2 ) are formed with a support ( 4 ) fixed on the central structural case ( 6 ) of the corresponding flattened body ( 1 ) or ( 2 ), and a screw ( 7 ) coupled to the respective tie ( 3 ), said screw ( 7 ) having a ring-shaped head ( 8 ), by means of which a hinged attachment is formed with the corresponding support ( 4 ) by means of a pin ( 9 ). 
     
     
         4 . The blade for a horizontal-axis wind generator according to  claim 1 , characterized in that the flattened bodies ( 1 ) and ( 2 ) are attached at the end of the blade by means of a transverse strut ( 10 ) with an aerodynamic section.