F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
F16J 15/32 (2006.01) F16J 15/44 (2006.01)
Patent
CA 2403664
A brush seal (10) for sealing a circumferential gap between two relatively rotating machine components, e.g. the rotor (14) or shaft and stator (12) of a fluid flow machine, such as a gas turbine engine. One end of a plurality of seal bristles (16) is fixed in an annular shape and are mounted to the stator, and their opposite ends are attached to a number of individual shoes (24) located at the rotor. The shoes function very similarly to that of a tilting pad bearing shoe. Prior to shaft (14) rotation, the shoes are in contact with the rotor surface with preferably the leading edge (26) of each shoe set to have less contact than the trailing edge (28) of the shoe. As such, when the rotor begins to rotate, a hydrodynamic wedge is created which lifts the shoe slightly off the surface of the shaft allowing the shoe to effectively "float" over the shaft at a design gap.
L'invention concerne un joint à brosse (10) conçu pour étanchéifier un espace circonférentiel entre deux composants de machine rotatifs opposés, par exemple le rotor (14) ou l'arbre et le stator (12) d'une turbomachine, telle qu'une turbine à gaz. Les extrémités de plusieurs crins (16) de joint sont fixées en une forme annulaire et solidaires du stator, les extrémités opposées étant fixées à un certain nombres de sabots (24) placés sur le rotor. Les sabots fonctionnent de manière très analogue à ceux d'un palier à patins oscillants. Avant la rotation de l'arbre (14), les sabots sont en prise avec la surface du rotor, le bord d'attaque (26) de chaque sabot ayant, de préférence, moins de prise que le bord de fuite (28) du sabot. Ainsi, lorsque le rotor commence sa rotation, un coin hydrodynamique est créé et soulève légèrement le sabot de la surface de l'arbre, ce qui permet au sabot de "flotter" efficacement au-dessus de l'arbre à un espace de conception.
Justak John F.
Macrae & Co.
LandOfFree
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