# US 4,392,656 A · Air-cooled sealing rings for the wheels of gas turbines

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- Number: US 4,392,656 A
- Document ID: US4392656A
- Status: Granted
- Kind: A
- Application number: 06/200,036
- Filed: 1980-10-23
- Granted: 1983-07-12
- Earliest claimed: 1979-10-26
- Assignees: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
- Inventors: Jacques P. H. Tirole; Claude M. Mons; Roland R. Spinat
- Web page: https://patentgrep.com/patent/US4392656A

## CPC

- F01D 11/122: {with erodable or abradable material (blades having cutting or grinding tips F01D5/20)}
- F05D 2260/203: by transpiration cooling
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10S 277/93: Seal including heating or cooling feature
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A sealing ring according to claim 1 wherein the separating layer is made of perforated foil .

### Claim 3 (depends on 2)

A sealing ring according to claim 2 wherein the separating layer is a deposit obtained by plasma spraying onto the cooling layer.

### Claim 4 (depends on 1)

A sealing ring according to claim 1 wherein the separating layer is appreciably thinner than the wear layer which itself is appreciably thinner than the cooling layer.

### Claim 5 (depends on 4)

A sealing ring according to claim 4 wherein the thicknesses of the three layers are such that in normal operation the ends of said blades are out of contact with the separating layer.

### Claim 6 (depends on 5)

A sealing ring according to claim 5 wherein the thickness of the cooling layer is between 3 and 10 mm, the thickness of the separating layer between 0.1 and 0.5 mm and the thickness of the wear layer between 0.5 and 3 mm.

### Claim 7 (depends on 6)

A sealing ring according to claim 6 wherein the thickness of the cooling layer is between 5 and 6 mm, the thickness of the separating layer between 0.1 and 0.2 mm and the thickness of the wear layer between 1 and 1.5 mm.