STEAM TURBINE INTEGRAL CONTROL STAGE BLADE GROUP

摘要

An integral control stage blade group for use in a steam turbine having a rotor, the rotor including radially extending flanges provided with opposed and smooth faces defining at least one pair of spaced annular grooves. The blade group comprises a plurality of blades attached to a unitary platform. Secondly, the blade group comprises a plurality of root portions depending from the platform in a direction opposite from the blades. The root portions extend along the platform in a circumferential direction when said blade group is mounted on the rotor. Each of the root portions fits within a respective one of the annular grooves in the rotor. Finally, the blade group comprises at least three spaced apertures formed in said root portion and arranged to align with corresponding apertures in the rotor flanges when the blade group is mounted on the rotor. Each aperture is formed so as to lie on a common rotor circumference and to extend parallel to an axis of the rotor fog receiving a pin through the aligned apertures to fasten the blade group to the rotor.