Split ring retainer for turbine outer air seal

摘要

A retainer (50) for securing the outer air seal assembly (10) of a turbine rotor stage in a locked position. The outer air seal (10) is suspended from the turbine casing (20) over the rotor stage and is locked to the casing by annular segmented locking keys (28). A series of circumferentially spaced seats (59) are located upon the front face of the locking key segments (28) with the outer surfaces (60) of the seats (59) describing a circle approximating a first diameter. A split ring retainer (50) is slidably carried in a radially disposed groove (63) and is arranged to secure the key segments (28) in a locked position. A series of lugs (57) extend inwardly from the inside wall (58) of the ring (50). The lugs (57) are circumferentially spaced about the ring (50) with the inner surface (61) of the lugs (57) approximating a circle having a second diameter that is less that of the first diameter approximated by the seats (59). The lugs (57) are spaced so that each lug (57) can be seated upon a seat (59) to flex the ring (50) outwardly in a radial direction and thus secure the key segment (28) in a locking position.