| 摘要 |
In a non-contacting gas seal for a gas turbine engine a seal ring (12) (FIG. 3) is formed from a ring of overlapping segments (16) mounted in a housing (14) on a static component (9) of the engine, and co-operating to define a sealing face (15) which confronts a sealing face (10) on a rotating component (8) to form a seal. The segments overlap and are spaced at their leading ends from the rotating component to define a tapering gap (19) therebetween so that they lift away from the rotating component in operation to ride on a gas film leaving only a very small clearance. In order to ensure that the relative circumferential dispositions of the segments does not alter significantly due to eccentric movements of the rotating component in operation, a dogged ring (34) is provided which is located in the housing by an anti-rotation dog (38) and has spaced dogs (36) engaging each of the segments to prevent circumferential movement thereof while allowing limited radial movement. |
