Method and apparatus for minimizing leakage in turbine seals

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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F01D 11/02 (2006.01) F16J 15/44 (2006.01)

Patent

CA 2253219

The invention pertains to a method and apparatus for minimizing the leakage of working fluid through the fluid leakage path (L) of a turbine seal. The invention may be described in general terms as producing from rotary motion of the working fluid a region (58) of lowered pressure PL in the working fluid in a portion of the leakage path adjacent a high pressure P1 side of a sealing ring (50) of the seal. This function may be performed by producing and shedding vortices in the working fluid at one or more points about the circumference of the sealing ring (50). This function may be accomplished by providing a sealing ring having a tooth portion (54) provided in one or more tooth segments, portions of one or more trailing edges (56) of the tooth segments extending outward in a common direction.

L'invention concerne un procédé et un appareil permettant de réduire au minimum les fuites de fluide s'écoulant au travers d'un passage (L) d'un joint de turbine. L'invention peut être décrite en général comme la création, à partir du mouvement de rotation du fluide de travail, d'une région (58) de basse pression (P¿L?) du fluide de travail dans une partie du chemin de fuite adjacent au côté haute pression (P¿1?) d'une bague d'étanchéité (50) du joint. Cette fonction peut être assurée en produisant des tourbillons dans le fluide de travail en un ou plusieurs points autour de la circonférence de la bague d'étanchéité (50). Ceci peut être accompli en utilisant une bague d'étanchéité qui présente une partie dentée (54) dans un ou plusieurs segments de dent, les portions d'un ou de plusieurs bords de fuites (56) des segments de dent partant vers l'extérieur dans une direction commune.

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