Turbine blade with detached platform

Details Turbine blade with detached platform Turbine blade with detached platform

2011-01-25

2011-01-25

Edgar, Richard (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

C416S248000

Reexamination Certificate

active

07874804

ABSTRACT:
A turbine blade with a detached platform in which the platform has a central opening in which the blade is inserted and held in place. The blade includes a root portion with a fir tree configuration to fit within a slot of a rotor disc. The platform includes two legs that also have a fir tree configuration to fit within the slot of the rotor disc. The blade is inserted into the central opening and the fir tree configurations of the blade root and the platform legs form substantially an aligned set of fir trees that fit within the rotor disc slot to retain both the blade and the platform within the slot. The blade is therefore separated from the platform such that thermal stresses are uncoupled. Also, the blade can be made from a different material than is the platform. The centrifugal load applied to the platform is not transferred onto the blade.

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