Global Patent Index - EP 0773347 B1

EP 0773347 B1 20000531 - Strip seal for turbomachinery rotor blade tips

Title (en)

Strip seal for turbomachinery rotor blade tips

Title (de)

Lamellendichtung für Turbotriebwerke im Bereich der Rotorschaufelspitzen

Title (fr)

Dispositif d'étanchéité à lamelles pour des extremités des aubes mobiles de turbomachine


EP 0773347 B1 20000531 (DE)


EP 96116641 A 19961017


DE 19542083 A 19951111

Abstract (en)

[origin: EP0773347A1] A turbine engine seal, for the rotor blade tip region, has a cover band ring on the blade tips and opposite stationary casing ring segments in the cowling for sealing the rotor-stator gap. The novelty is that the cover band ring (5) has a smooth radially outer surface (9) and is held radially displaceably by the blades (11), while elastic laminates (12) extend radially inwards from the stationary casing ring segments of the cowling (20) to form scraping faces. The out-of-roundness tolerance and roughness of the radially outer cover band ring surface (9), the elasticity of the laminates (12) and the size of the scraping face of each laminate (12) are mutually related such that, beyond a critical relative speed between the radially outer cover band ring surface (9) and the scraping faces, an aerodynamic smoothing of scraping faces occurs on the outer surface of the cover band ring (5). Pref. the cover band ring (5) is a closed self-supporting ring of fibre-reinforced material, pre f. of SiC, B or C fibres in a metallic or ceramic matrix.

IPC 1-7

F01D 11/02; F01D 11/08; F01D 5/22

IPC 8 full level

F01D 5/22 (2006.01); F01D 11/08 (2006.01); F01D 11/12 (2006.01)

CPC (source: EP)

F01D 5/225 (2013.01); F01D 11/08 (2013.01); F01D 11/12 (2013.01); F05D 2240/56 (2013.01)

Designated contracting state (EPC)


DOCDB simple family (publication)

EP 0773347 A1 19970514; EP 0773347 B1 20000531; AT E193584 T1 20000615; DE 19542083 C1 19970109; ES 2148652 T3 20001016

DOCDB simple family (application)

EP 96116641 A 19961017; AT 96116641 T 19961017; DE 19542083 A 19951111; ES 96116641 T 19961017