Hydrodynamic brush seal

F - Mech Eng,Light,Heat,Weapons – 16 – J

Patent

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Details

F16J 15/32 (2006.01) F16J 15/44 (2006.01)

Patent

CA 2536362

A hybrid brush seal (10) is provided having two bundles (10, 20) of axially spaced seal bristles (18) each of which are mounted in a ring shape on a first machine component (12) with bristle ends (24) directed at a sealing surface of the second, rotating machine component (14). The bristle ends (24) are kept from direct contact with the rotating machine component (14) via one or more shoes (34) which are designed such that as the shaft (14) rotates a hydrodynamic film separates the shoe(s) (34) from the shaft (14). The shoe(s) (34) is attached to the bristle ends (24) at discreet locations. Alternatively, one or more bundles (42) of seal bristles (18) are mounted at one end either to the fixed or rotating machine component (12, 14), with the opposite bristle ends directed toward one or more shoes (34), and wherein one or more spring elements (52) are connected between the machine component and shoes (34).

L'invention concerne un joint à brosse (10) présentant deux paquets (10, 20) de poils d'étanchéité (18), chacun d'eau étant monté, selon un profil annulaire, sur un premier composant d'une machine (12), avec les extrémités des poils (24) dirigés vers une surface d'étanchéité du second composant (14) d'une machine tournante. Les extrémités des poils (24) sont maintenus hors contact direct avec le composant de la machine tournante (14), via un ou plusieurs frotteurs de contact (34) qui sont conçus de façon que lorsque l'arbre (14) est entraîné en rotation, un film hydrodynamique sépare le(s) frotteur(s) (34) de l'arbre (14). Les frotteurs (34) sont attachés aux extrémités des poils (24) en des emplacements discrets. En variante, un ou plusieurs paquets (42) des poils d'étanchéité (18) sont montés à une extrémité, soit du composant fixe, soit du composant de la machine tournante (12, 14), les extrémités opposées des poils étant dirigées vers un ou plusieurs frotteurs (34), cependant qu'un ou plusieurs éléments à ressort (52) sont connectés entre le composant de la machine et les frotteurs (34).

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