Multiple ventilated rails for sealing of combustor heat shields
AssigneePratt & Whitney Canada Corp.
InventorsLarry Lebel, Michael Papple
Life of this patent
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Abstract
A seal for sealing a combustor heat shield against an interior surface of a combustor shell, the seal comprising: an upstream rail and an downstream rail defining an intermediate groove therebetween, each rail having a sealing surface with a plurality of slots extending between an upstream wall surface and a downstream wall surface, the sealing surface conforming to the interior surface of the combustor shell and defining a leakage gap therebetween.
Claims16
A seal configured to provide sealing between a combustor heat shield and an interior surface of a combustor shell, the seal comprising:
- a projection extending integrally from a back face of the combustor heat shield, the projection having a distal end surface configured to face the interior surface of the combustor shell;
- an upstream rail and a downstream rail relative to a flow of cooling air between the combustor heat shield and the combustor shell, the upstream rail and the downstream rail being integrally formed on said distal end surface of the projection, the upstream rail and the downstream rail restricting air cooling leakage in series and defining an intermediate groove therebetween in said distal end surface of the projection, each of the upstream rail and the downstream rail having a sealing surface with a plurality of slots extending between an upstream wall surface and a downstream wall surface, the slots in the downstream rail being connected in flow communication with the slots in the upstream rail via the intermediate groove, the sealing surface of each of the upstream rail and the downstream rail configured for conforming to the interior surface of the combustor shell and for defining a leakage gap between the sealing surface of each of the upstream rail and the downstream rail and the interior surface of the combustor shell.
A combustor heat shield for a gas turbine engine, comprising a heat shield panel adapted to be mounted to a combustor shell with a back face of the heat shield panel in spaced-apart facing relationship with an interior surface of the combustor shell to define an air gap between the back face of the heat shield panel and the interior surface of the combustor shell, a projection extending form the back face of the heat shield, the projection configured to extend across the air gap, an upstream rail and a downstream rail relative to a flow of cooling air through the air gap, the upstream and downstream rails being integrally formed on a distal end surface of the projection for sealing engagement with the combustor shell, the upstream rail and the downstream rail defining an intermediate groove therebetween, the intermediate groove being defined in the distal end surface of the projection and having a depth which is smaller than that of the air gap, each of the upstream rail and the downstream rail having a sealing surface with a plurality of slots extending between an upstream wall surface and a downstream wall surface, the sealing surface of each of the upstream rail and the downstream rail conforming to the interior surface of the combustor shell and defining a leakage gap between the sealing surface of each of the upstream rail and the downstream rail and the interior surface of the combustor shell.
Dependencies are inferred from the claim text.