Patent ID: 7901187
Filing Date: 2011-03-08
Classification: F01D,F05B,F05D,Y10T

Abstract:
1. A blade lock structure for blading an axial flow turbine having a rotor and blades, wherein said blades are inserted into an undercut blade groove of the rotor providing a positive lock between the blades and the rotor, the lock structure comprising: an entry slot located in said blade groove for receiving said blades for insertion to said undercut blade groove; a last blade including a last blade root having a generally planar face; an insert space axially extending from said entry slot, said insert space defining a radially extending longitudinal axis and including axially extending side walls; an insert piece in positive-locking relationship with said insert space, said insert piece comprising a unitary member including an outer wall having opposing axially extending sides and a generally planar blade engaging face extending between said axially extending sides and engaged with said generally planar face of said last blade root, said insert piece sides and said insert space side walls including cooperating features for radial retention of said insert piece in said insert space; and a lock screw threadably engaged with both said insert piece and said last blade root.