US 6,142,737 A · Bucket and wheel dovetail design for turbine rotors

Abstract

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.

Claims12

Dependent claims

A dovetail joint between a rotor wheel and a bucket rotatable about an axis, comprising:

a male dovetail component on the rotor wheel and a female dovetail component in the bucket, said male dovetail component receiving said female dovetail component in a direction tangential to the rotor wheel, said male dovetail component including a plurality of hooks lying on opposite sides of a plane normal to the axis and bisecting said male dovetail component, each said hook having a generally radially inwardly facing surface;
said surfaces of at least a pair of said hooks on each of the opposite sides of the plane lying at angles extending away from said plane and away from said axis, the angles of said surfaces of said radial outermost hooks of said pairs of hooks being greater relative to the axis than the angles of said surfaces of radial innermost hooks of said pairs thereof.

Dependencies are inferred from the claim text.

Bucket and wheel dovetail design for turbine rotors

Life of this patent

Bucket and wheel dovetail design for turbine rotors

Life of this patent

Abstract

Claims12