Combined brush seal and labyrinth seal segment for rotary...

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

Patent

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F16J 15/447 (2006.01) F01C 19/00 (2006.01) F01D 11/02 (2006.01) F01D 11/12 (2006.01) F16J 15/32 (2006.01) F16J 15/44 (2006.01)

Patent

CA 2205846

A brush seal is comprised of arcuate seal segments having ends cut in a radial direction with bristles "canted" at an approximate 45° angle relative to radii of the segments, leaving triangular regions adjacent one end of each segment devoid of bristles at the segment interfaces. The brush seals are retrofit into conventional labyrinth seals with the backing plate for the bristles comprising a labyrinth tooth profile extending fully 360° about the seal, including those areas where bristles are not present. The sealing capacity is not substantially degraded, while affording significant sealing improvements over conventional labyrinth seals. Additionally, when retrofit into labyrinth seals with radial movement, the individual labyrinth seal segments are free to move radially independently of one another during transients.

Joint à balai comprenant des segments de joint arciformes dont les extrémités sont coupées radialement par rapport aux poils ÕbiseautésÕ à un angle d'environ 45 degrés relativement aux rayons des segments, laissant ainsi des zones triangulaires à côté d'une extrémité de chaque segment dépourvu de poils aux interfaces de segment. Les joints à balais sont modifiés en joints d'étanchéité conventionnels à labyrinthe dont la plaque de support pour les poils comprend un profil denté à labyrinthe sur 360 degrés par rapport au joint d'étanchéité, y compris les endroits où il n'y a pas de poils. La capacité de scellement n'est pas modifiée de beaucoup à la baisse; par contre, elle améliore grandement l'étanchéité comparativement aux joints conventionnels à labyrinthe. De plus, lorsqu'on utilise des joints d'étanchéité à labyrinthe avec déplacement radial, les segments individuels de joint à labyrinthe sont libres de se déplacer radialement, indépendamment les uns des autres pendant les transitoires.

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