COVER PLATE, TURBINE WHEEL, AND TURBINE HAVING TURBINE WHEEL

摘要

PURPOSE: A cover plate, a turbine wheel, and a turbine having the turbine wheel are provided to control bending moment and warping of a cover plate, and restrict movement of the circumferential direction of a twist lock type holding pin. CONSTITUTION: The cover plate(16) have an angle wing type seal(42) protruded to the axial direction. The cover plates(16) also have balance weights(48) on axial faces thereof opposite the angel wing seals(42) to balance out any bending moments applied to the cover plate(16) resulting from centrifugal forces when the turbine rotor is at speed. A centering groove is disposed along an inner surface of each dovetail connecting part to the cover plate. The cover plate holding pin(50) is placed in a wide sub slot of a base part of a wheel slot. When the cover plate is fixed with respect to movement of the axial direction, the holding pin is engaged with the centering groove of a cover plate dovetail so as to prevent movement of the circumferential direction of the holding pin in the wide sub slot.