Patent ID: 6464455
Filing Date: 2002-10-15
Classification: F01D,F05D

Abstract:
In a turbine having a rotor and a plurality of stages, each stage comprising a row of buckets supported on a wheel mounted on the rotor for rotation therewith; and wherein the buckets of at least one of said stages are cooled by air or steam, the improvement comprising:at least one axially extending coolant supply conduit communicating with an at least partially annular coolant supply manifold; one or more axially extending coolant feed tubes connected to said manifold at a location radially outwardly of said coolant supply conduit, said one or more feed tubes arranged to supply coolant to one or more buckets of at least one of said plurality of stages; said manifold extending radially beyond said one or more axially extending feed tubes to thereby create a debris trap region for collecting debris under centrifugal loading caused by rotation of the rotor.