General Electric Company

Robert E Seeley

John Francis Nolan

Gerald Richard Crawmer

James Harvey Vogan

Karl Rudolph Anderson, Iii

Edward Kenneth Ellis

Joseph John Pepe

Louis Patrick Earvolino

Robert Joseph Christoffel

Joseph Louis Van Ullen

Raymond J Jones

Eloy Vincent Emeterio

Cuong V Dinh

Carl L De Cesare

Joseph H Stocks, Iii

Carlos E Silva

A dovetail joint between a rotor wheel and a bucket includes a male dovetail component on the rotor wheel and a female dovetail component in the bucket. The male dovetail component has axially projecting hooks with slanted crush surfaces along generally radially inwardly directed surfaces. The slanted surfaces form included angles with neck portions parallel to a plane normal to the axis of rotation which are larger than 90.degree. and decrease in included angle from the radially outermost hooks to the radially innermost hook where the angle is 90.degree.. Compound fillets are also provided along the transition surfaces between the slanted crush surfaces and the neck surfaces. Thus, stress concentrations are minimized.

Bucket and wheel dovetail design for turbine rotors

A method for repairing the rim of a steam turbine rotor, and a weld material for repairing such rotors. The method generally includes the steps of removing a damaged rim and its associated dovetail region, so as to form a surface at the perimeter of the rim portion. A weld repair region is then formed on the surface, which is machined to reconstruct the rim portion and the dovetail region exclusively with the weld repair region. Thereafter, an appropriately configured blade is secured to the rim portion with the dovetail region. The method is particularly intended for the repair of a steel alloy rotor, such as a NiCrMoV, NiMoV and CrMoV alloy, while the weld repair is formed with a nickel-base superalloy whose mechanical and thermal properties are compatible with the repair method and the steel alloy over a broad temperature range.

Method of repairing a steam turbine rotor

A turbine rotor comprising a radially-inward portion of a steel alloy and a radially-outward rim portion circumscribing the radially-inward portion, the rim portion being formed by a weldment that includes a nickel-base superalloy region joining the rim portion to the inward portion of the turbine rotor, the nickel-base superalloy having a room temperature ultimate tensile strength of at least about 690 MPa.

In a steam turbine rotor wheel and bucket dovetail joint construction wherein the wheel dovetail includes a plurality of radially adjacent hooks interconnected by respective necks, each having an upper and lower fillet pair of substantially identical fillet, an improvement wherein each upper fillet has a compound radius.

Bucket to wheel dovetail design for turbine rotors

In a steam turbine rotor wheel and bucket dovetail joint construction wherein the wheel dovetail includes three radially aligned hooks each interconnected by a neck having an upper and lower fillet, an improvement includes redesigned fillet radii which, in a first embodiment, include the upper fillet having a radius greater than the lower fillet radius. In certain embodiments, the upper fillet may have a radius twice that of the lower fillet. In other embodiments, the radii in both the upper and lower fillets have been enlarged.

A dovetail joint between a rotor wheel and a bucket includes a male dovetail component on the rotor wheel and a female dovetail component in the bucket, wherein the male dovetail component includes four laterally projecting hooks, each hook from an uppermost hook to a lowermost hook decreasing in radial thickness and increasing in axial length. Each hook has a substantially flat top surface to effectively increase the average thickness, and a neck between the respective hooks having enlarged fillets. The new dovetail joint reduces peak stresses so as to avoid or minimize stress corrosion cracking.

A method for determining the portion of life expended for a turbomachine component during a predetermined interval uses the rate at which creep strain accumulates to provide an indication of the portion of life expended.

Growing community of inventors

Broadalbin, NY, United States of America

Robert E Seeley