Seal mechanism for use with turbine rotor

摘要

A seal mechanism is provided which comprises a structure capable of accommodating radial expansions of turbine rotor without increasing an axial size thereof and providing a reliable sealing property for the turbine rotor for a long time. The seal mechanism comprises a labyrinth seal 91, 93 defined by a projection 87 provided on the turbine rotor 11B, an outer member 67 provided radially outward of the projection and supported for displacement in a radial direction, and an inner member 69 provided radially inward of the projection and supported for displacement in the radial direction. A thermal expansion rate of the inner member is greater than that of the outer member.

主权项

1. A seal mechanism for a turbine rotor in a gas turbine engine, comprising:
a labyrinth seal defined by
an annular cylindrical projection provided on the turbine rotor so that the annular cylindrical projection extends about a longitudinal axis of the turbine rotor,an outer ring member provided radially outward of the projection, andan inner ring member provided radially inward of the projection, wherein the inner ring member has an outer periphery, the outer periphery including grooves extending in a direction parallel to the longitudinal axis of the turbine rotor formed on the outer periphery and spaced at intervals in a peripheral direction of the ring member, the outer ring member includes pins extending parallel to the longitudinal axis of the turbine rotor, and the pins are engaged in the grooves so that the inner member is movable in the radial direction of the turbine rotor but immovable in a peripheral direction of the turbine rotor relative to the outer ring member, wherein the inner and outer ring members are made of different materials and a coefficient of thermal expansion of the material of the inner member is greater than that of the outer member.