Sealing method and device for a gas turbine shaft

Details Sealing method and device for a gas turbine shaft Sealing method and device for a gas turbine shaft

F - Mech Eng,Light,Heat,Weapons

02

C

F02C 7/28 (2006.01) F01D 11/00 (2006.01) F01D 11/02 (2006.01) F01D 21/04 (2006.01) F02C 3/067 (2006.01) F16J 15/00 (2006.01) F16J 15/44 (2006.01)

Patent

CA 2458458

A method and apparatus for sealing a radial gap (27) between coaxial inner and outer rotating shafts (26, 28) of a gas turbine engine includes using a radial seal (64) as a main seal to seal the gap (27) for a normal engine operation condition, and using an axial seal (70) as a back-up seal for a double seal of the gap. The radial seal (64) provides a seal which meets relatively restrictive leakage requirements for the normal engine operation condition and the axial seal (70) provides a back-up seal which meets less restrictive leakage requirements but is much more tolerant of radial displacement and vibration between the coaxial inner and outer rotating shafts. An engine operable condition is ensured under abnormal conditions, such as bird strikes, in which the coaxial relationship between the inner and outer rotating shafts (26, 28) are affected by unbalancing forces caused by the bird strike, thereby causing a failure of the radial seal.

L'invention concerne un procédé et un dispositif d'étanchéification d'un espace radial (27) situé entre des arbres rotatifs coaxiaux interne et externe (26, 28) d'une turbine à gaz. Ce dispositif comprend, d'une part, un joint d'étanchéité radial (64) servant de joint d'étanchéité principal utilisé pour étanchéifier ledit espace (27) lors du fonctionnement normal du moteur, et, d'autre part, un joint d'étanchéité axial (70) servant de joint d'étanchéité auxiliaire utilisé pour une double étanchéification dudit espace (27). Le joint d'étanchéité radial (64) est adapté aux conditions de fonctionnement normales du moteur et le joint d'étanchéité axial (70) est moins adapté aux conditions de fonctionnement normales du moteur, mais beaucoup plus adapté aux vibrations et aux mouvements radiaux entre les arbres rotatifs coaxiaux interne et externe. Ce dispositif permet à la turbine de continuer à fonctionner dans des conditions de fonctionnement anormales, telles que lors d'impacts d'oiseaux, au cours desquelles le rapport coaxial entre les arbres rotatifs interne et externe (26, 28) est affecté par des forces créant un déséquilibre causées par l'impact d'un oiseau et entraînant un mauvais fonctionnement du joint d'étanchéité radial.

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