Expanding sealing strips for steam turbines

Details Expanding sealing strips for steam turbines Expanding sealing strips for steam turbines

2005-05-24

2005-05-24

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Including thermal expansion joint

Radially sliding

C415S173100, C415S173500, C415S173600, C415S214100, C415S229000, C415S231000, C277S412000

Reexamination Certificate

active

06896482

ABSTRACT:
A turbine includes, in an exemplary embodiment, an outer housing, a turbine shaft rotatably supported in the outer housing, and a plurality of turbine stages located along the turbine shaft. Each turbine stage includes a diaphragm attached to the casing, a rotor having a plurality of buckets and a bucket cover fixedly attached to the turbine shaft, and a packing ring mounted in a first circumferentially extending groove in said diaphragm. The packing ring includes a seal shroud and a sealing means 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.

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International Search Report, dated Jan. 4, 2005, Application No. PCT/US2004/028773, 5 pages.

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