Expanding sealing strips for steam turbines

A turbine (10) includes, in an exemplary embodiment, an outer housing (22), a turbine shaft (12) rotatably supported in the outer housing, and a plurality of turbine stages located along the turbine shaft. Each turbine stage includes a diaphragm (20) attached to the casing, a rotor (46) having a plu...

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Bibliographische Detailangaben
1. Verfasser:	PARRY WILLIAM THOMAS
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL HEATING INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04 LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A turbine (10) includes, in an exemplary embodiment, an outer housing (22), a turbine shaft (12) rotatably supported in the outer housing, and a plurality of turbine stages located along the turbine shaft. Each turbine stage includes a diaphragm (20) attached to the casing, a rotor (46) having a plurality of buckets (16) and a bucket cover (52) fixedly attached to the turbine shaft, and a packing ring (54) mounted in a first circumferentially extending groove (56) in said diaphragm. The packing ring includes a seal shroud (58) and a sealing means (60) and is positioned adjacent the turbine shaft. The seal shroud is fabricated from a first material having a first coefficient of expansion, and the is diaphragm fabricated from a second material having a second coefficient of expansion. The first and second materials are selected so that at a first temperature a gap between the turbine shaft and the diaphragm is larger than at a second higher temperature.