Dovetail for steam turbine rotating blade and rotor wheel
AssigneeGeneral Electric Company
InventorsAlan Richard DeMania, Steven Michael DeLessio
Life of this patent
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Abstract
A dovetail for a steam turbine rotating blade and rotor wheel is provided. The dovetail design comprises a rotating blade curved axial entry dovetail having a four hook profile and a rotor wheel dovetail slot sized to receive the blade dovetail. The blade dovetail and wheel dovetail slot each comprise a plurality of slanted crush surfaces, a plurality of non-contact surfaces, and a plurality of necks that each provide a transition between a slanted crush surface to a non-contact surface. Each neck comprises a slant angle defined by the transition of the slanted crush surface to the non-contact surface. The slant angle ranges from about 60 degrees to about 82 degrees.
Claims17
A dovetail for a steam turbine, comprising a rotating blade curved axial entry dovetail having a four hook profile and a rotor wheel dovetail slot sized to receive the blade dovetail, the blade dovetail and wheel dovetail slot each comprising a plurality of slanted crush surfaces, a plurality of non-contact surfaces, and a plurality of necks that each provide a transition between a slanted crush surface and a non-contact surface, wherein each neck comprises a slant angle defined by the transition of the slanted crush surface to the non-contact surface, wherein the slant angle ranges from about 60 degrees to about 82 degrees.
A steam turbine, comprising:
- a plurality of steam turbine blades arranged about a rotor wheel, the plurality of steam turbine blades each comprising an airfoil portion and a curved axial entry dovetail section having a four hook profile, the rotor wheel comprising a plurality of dovetail slots sized to receive a respective blade dovetail section, each blade dovetail section and wheel dovetail slot comprises a plurality of slanted crush surfaces, a plurality of non-contact surfaces, and a plurality of necks defined by a transition between a slanted crush surface to a non-contact surface, wherein each neck comprises a slant angle defined by the transition of the slanted crush surface to the non-contact surface, wherein the slant angle ranges from about 60 degrees to about 82 degrees.
Dependencies are inferred from the claim text.