DOVETAIL CONNECTION FOR TURBINE ROTATING BLADE AND ROTOR WHEEL

• Main Authors: KRIKUNOV DMITRY VIKTOROVICH, MUJEZINOVIC AMIR
• Format: Patent
• Language: English
• Published: 02.02.2012
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS; INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To reduce stress concentration and stress corrosion cracking in a dovetail for a turbine rotating blade and a rotor wheel in a turbine machine.SOLUTION: Swivel dovetail connections, such as a tangential entry, straight axial entry or curved axial entry dovetails, for connecting a blade 120 and a rotor wheel 118 in a turbomachine are disclosed. A modified shape of a dovetail contact surface 145 creates a swivel dovetail connection between the blade and the rotor wheel, and allows limited motion of the blade relative to the wheel, while still maintaining the structural connection between the blade and the wheel. The swivel dovetail connection is achieved by providing a concave or convex dovetail contact surface between a rotor wheel and a blade such that the contact surface lies along a common substantially toroidal arc, an axially extending, substantially cylindrical arc, or a substantially frusto-conical arc.