Fastening rotor blades in a turbomachine

Abstract

The rotor blades of a turbomachine are fastened to the rotor ( 3 ) of the machine by means of blade roots ( 1 ) by the blade roots ( 1 ) being anchored in peripheral grooves ( 2 ). According to the invention, the blade roots ( 1 ) have at least one recess or opening ( 4 ), which extends in the peripheral direction and in each of which a connecting piece ( 5 ) is arranged. This connecting piece ( 5 ) connects at least two blade roots ( 1 ) to form a blade pack. By means of the connection, the blade roots ( 1 ) are secured against twisting and falling out of the peripheral groove ( 2 ). The connecting piece ( 5 ) consists of a shaped piece, which is laid with little clearance into the recess or opening ( 4 ), a displacement of a blade root ( 1 ) and of the connecting piece ( 5 ) relative to one another still being possible. The blade root of the last blade of a blade row which is assembled in a peripheral groove is locked to the adjacent blade roots by a final connecting piece.

1 . A fastening arrangement for rotor blades on the rotor ( 3 ) of a turbomachine, the rotor blades each having a blade root ( 1 ) which is anchored in a peripheral groove ( 2 ), characterized in that the blade roots ( 1 ) each have at least one recess ( 4 ) or opening, the recess or opening extending in the peripheral direction, and in that a connecting piece ( 5 ), which is matched to the shape of the recess ( 4 ) or opening, is arranged in each recess or opening, and in that the connecting piece connects at least two blade roots ( 1 ) to form a blade root pack.  
     
     
         2 . The fastening arrangement for rotor blades as claimed in    claim 1   , characterized in that the blade roots ( 1 ) each have two recesses ( 4 ) or openings, in each of which a connecting piece is arranged.  
     
     
         3 . The fastening arrangement for rotor blades as claimed in    claim 1    or    2   , characterized in that the at least one recess ( 4 ) is respectively arranged on the side of the blade root ( 1 ) facing the bottom of the groove of the peripheral groove ( 2 ) and has a rectangular cross section, and in that the connecting piece ( 5 ), which is laid in each case into the at least one recess ( 4 ), is a shaped piece of the same rectangular cross section.  
     
     
         4 . The fastening arrangement for rotor blades as claimed in    claim 1    or    2   , characterized in that the opening on the blade root ( 1 ) is a bore opening and in that the connecting piece consists of a wire of the same diameter which is pushed into the bore opening.  
     
     
         5 . The fastening arrangement for rotor blades as claimed in one of    claims 1    to    4   , characterized in that the connecting pieces ( 5 ) extend over almost the complete periphery of the groove and connect almost all the blade roots ( 1 ) to form one blade pack.  
     
     
         6 . The fastening arrangement for rotor blades as claimed in one of    claims 1    to    4   , characterized in that the connecting pieces ( 5 ) extend over two or more blade roots ( 1 ) and connect the latter to form a plurality of blade packs.  
     
     
         7 . The fastening arrangement for rotor blades as claimed in    claim 6   , characterized in that each of the blade roots ( 2 ) has two recesses ( 4 ) or openings and the connecting pieces ( 5 ) each extend over two blade roots ( 1 ) and in that the connecting pieces, which are arranged parallel to one another, are arranged offset by one blade root.  
     
     
         8 . The fastening arrangement for rotor blades as claimed in one of    claims 1    to    7   , characterized in that each of the blade roots ( 1 ) has a round recess ( 6 ) in which a contact pressure spring ( 7 ) is arranged.  
     
     
         9 . The fastening arrangement for rotor blades as claimed in one of    claims 1    to    7   , characterized in that the last blade root ( 1 ) assembled into the peripheral groove ( 2 ) is locked to the adjacent blade roots by displacing one or two connecting pieces ( 5   d ,  5   e ).