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US 4,392,656 AGranted
Air-cooled sealing rings for the wheels of gas turbines
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorsJacques P. H. Tirole, Claude M. Mons, Roland R. Spinat
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Abstract
Sealing ring for the wheel of a gas turbine comprising successively from the periphery toward the axis, an annular support surrounding the wheel, an annular cooling layer attached to the annular support and made of a material permeable by air, and an annular wear layer. The sealing ring further contains a separating layer inserted between the cooling layer and the wear layer.
Claims7
An assembly including a cooled sealing ring for the bladed wheel of a gas turbine of the type comprising successively from the periphery toward the axis:
- an annular support surrounding the wheel,
- a first annular layer designated the "cooling layer" attached to the inner surface of said annular support and made of a material permeable to air,
- cooling air inlet means at the upstream region of said cooling layer, downstream exhaust means and deflectors in said cooling layer, said cooling layer being of a material whereby it serves as a reserve wear layer;
- a thin, separating layer radially inwardly of said cooling layer, said separating layer being permeable to air with its permeability decreasing from upstream to downstream;
- and
- a wear layer adjacent the ends of the wheel blades and made of a material capable of being abraded by said blades and being traversed radially by the air from the cooling layer passing through the separating layer.
3 more elements
Dependencies are inferred from the claim text.