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US 6,439,844 B1 56 axis of the turbine in a predetermined circumferential direction, said covers having leading edges and trailing edges in the direction of rotation of the buckets; a brush seal projecting from the shroud and comprising a plurality of bristles for sealingly engaging radially outer surfaces of said covers; and a joint betWeen circumferentially adjacent covers Wherein adjoiningleadingandtrailingedgessealinglyengage one another substantially to preclude radial out?oW of the ?uid medium onto said bristles as the buckets and covers rotate relative to the brush seal. 2. A seal according to claim 1 Wherein said joint com prisesalapjoint. 3. A seal according to claim 1 Wherein said joint com prisesatongue-and-groovejoint. 4. A seal according to claim 1 Wherein each of said buckets includes a discrete cover, said bucket and said cover beingintegrallycast. 5.A sealaccordingtoclaim4Whereinsaidjointcomprise alapjoint. 6.A sealaccordingtoclaim4Whereinsaidjointcomprise a tongue-and-groove joint. 7.A sealaccordingtoclaim1Whereinsaidcoversform adiscretebandextendinginacircumferentialdirection,said band being connected to at least tWo adjacent buckets. 8.A sealaccordingtoclaim7Whereinsaidjointcom prisesalapjoint. 9.A sealaccordingtoclaim7Whereinsaidjointcom prisesatongue-and-groovejoint. 10 15 25 a plurality of arcuate covers carried by radial outer ends of said buckets for rotation With said buckets about an axis of the turbine in a predetermined circumferential direction, said covers having adjoining edges; a brush seal projecting from the shroud and comprising a plurality of bristles for sealingly engaging radially outer surfaces of said covers; a joint betWeen circumferentially adjacent covers Wherein at least portions of said adjoining edges overlap one another to substantially seal said adjacent covers to one another at axial locations corresponding to axial loca tions of said cover surfaces engaged by said bristles to substantially preclude radial out?oW of the ?uid mediumpasttheoverlappingportionsofsaidadjoining edges. 10. A seal according to claim 1 Wherein said adjoining edgeshavelinear,generallyaxiallyextending,endmargins axially and circumferentially spaced from one another and angledmarginsintermediatesaidendmarginsandintercon necting said end margins, said brush seal bristles engaging said cover surfaces at an axial location corresponding to 35 comprisesatongue-and-groovejoint. axial locations of said intermediate angled margins. 11.A sealaccordingtoclaim1Whereinsaidjointincludes an outer cover overlying said covers and spanning betWeen said adjacent covers, said outer cover sealing any gap betWeen said adjacent covers. 12. In a turbine having a plurality of rotatable buckets, a stationary shroud surrounding the rotatable buckets, and a ?uid medium ?oW path through the turbine, a seal betWeen said buckets and said stationary shroud, comprising: 21. A seal according to claim 12 Wherein said adjoining edgeshavelinear,generallyaxiallyextending,endmargins axially and circumferentially spaced from one another and angledmarginsintermediatesaidendmarginsandintercon necting said end margins, said brush seal bristles engaging said cover surfaces at an axial location corresponding to axial locations of said intermediate angled margins. 13. A seal according to claim 12 Wherein said joint comprises a lap joint. 14. A seal according to claim 12 Wherein said joint comprises a tongue-and-groove joint. 15. A seal according to claim 12 Wherein each of said buckets includes a discrete cover, each said bucket and said coverbeingintegrallycast. 16.A sealaccordingtoclaim15Whereinsaidjoint comprises a lap joint. 17. A seal according to claim 15 Wherein said joint comprises a tongue-and-groove joint. 18. Aseal according to claim 12 Wherein said covers form a discrete band extending in a circumferential direction, said band being connected to at least tWo adjacent buckets. 19. A seal according to claim 18 Wherein said joint comprises a lap joint. 20. A seal according to claim 18 Wherein said jointPDF Image | TURBINE BUCKET COVER AND BRUSH SEAL
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