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 b
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.
대표청구항▼
1. A steam turbine comprising:an outer housing; a turbine shaft rotatably supported in said outer housing; and a plurality of turbine stages located along said turbine shaft and contained within said outer housing, each said turbine stage comprising: a diaphragm attached to the casing, said diaphrag
1. A steam turbine comprising:an outer housing; a turbine shaft rotatably supported in said outer housing; and a plurality of turbine stages located along said turbine shaft and contained within said outer housing, each said turbine stage comprising: a diaphragm attached to the casing, said diaphragm comprising a plurality of nozzles; a rotor fixedly attached to said turbine shaft, said rotor comprising a plurality of buckets and a bucket cover; and a packing ring mounted in a first circumferentially extending groove in said diaphragm, said packing ring comprising a seal shroud and a sealing means, said packing ring positioned adjacent said turbine shaft to provide a seal in a gap between said turbine shaft and said diaphragm; said seal shroud fabricated from a first material having a first coefficient of expansion, said diaphragm fabricated from a second material having a second coefficient of expansion, said first and second materials selected so that at a first temperature said gap between said turbine shaft and said diaphragm is larger than at a second higher temperature. 2. A turbine in accordance with claim 1 further comprising a spill-strip seal ring mounted in a second circumferentially extending groove in said diaphragm, said spill-strip seal ring comprising a seal shroud and a sealing means, said spill-strip seal ring positioned adjacent said bucket cover to provide a seal in a gap between said bucket cover and said diaphragm;said seal shroud of said spill-strip seal ring fabricated from a third material having a third coefficient of expansion, said third material selected so that at a first temperature said gap between said bucket cover and said diaphragm is larger than at a second higher temperature. 3. A turbine in accordance with claim 1 wherein said packing ring sealing means comprises at least one of a plurality of seal teeth and a brush seal.4. A turbine in accordance with claim 2 wherein said spill-strip seal ring sealing means comprises at least one of a plurality of seal teeth and a brush seal.5. A turbine in accordance with claim 1 wherein said coefficient of expansion of said second material is larger than said coefficient of expansion of said first material.6. A turbine in accordance with claim 2 wherein said coefficient of expansion of said second material is larger than said coefficient of expansion of said third material.7. A turbine in accordance with claim 6 wherein said coefficient of expansion of said first material is larger equal to said coefficient of expansion of said third material.8. A turbine in accordance with claim 1 wherein said coefficient of expansion of said second material is less than said coefficient of expansion of said first material.9. A turbine in accordance with claim 2 wherein said coefficient of expansion of said second material is less than said coefficient of expansion of said third material.10. A turbine in accordance with claim 9 wherein said coefficient of expansion of said first material is larger equal to said coefficient of expansion of said third material.11. A diaphragm for a steam turbine, the turbine comprising a rotatable shaft and at least one rotor fixedly attached to the shaft, the rotor comprising a plurality of buckets and a bucket cover, said diaphragm comprising:a plurality of nozzles; and a packing ring mounted in a first circumferentially extending groove in said diaphragm, said packing ring comprising a seal shroud and a sealing means, said packing ring configured to be positioned adjacent the turbine shaft to provide a seal in a gap between the turbine shaft and said diaphragm; said seal shroud fabricated from a first material having a first coefficient of expansion, said diaphragm fabricated from a second material having a second coefficient of expansion, said first and second materials selected so that at a first temperature the gap between the turbine shaft and said diaphragm is larger than at a second higher temperature. 12. A diaphragm in accordance with claim 11 further comprising a spill-strip seal ring mounted in a second circumferentially extending groove in said diaphragm, said spill-strip seal ring comprising a seal shroud and a sealing means, said spill-strip seal ring configured to be positioned adjacent the bucket cover to provide a seal in a gap between the bucket cover and said diaphragm;said seal shroud of said spill-strip seal ring fabricated from a third material having a third coefficient of expansion, said third material selected so that at a first temperature the gap between the bucket cover and said diaphragm is larger than at a second higher temperature. 13. A diaphragm in accordance with claim 11 wherein said packing ring sealing means comprises at least one of a plurality of seal teeth and a brush seal.14. A diaphragm in accordance with claim 12 wherein said spill-strip seal ring sealing means comprises at least one of a plurality of seal teeth and a brush seal.15. A diaphragm in accordance with claim 11 wherein said coefficient of expansion of said second material is larger than said coefficient of expansion of said first material.16. A diaphragm in accordance with claim 12 wherein said coefficient of expansion of said second material is larger than said coefficient of expansion of said third material.17. A diaphragm in accordance with claim 16 wherein said coefficient of expansion of said first material is larger equal to said coefficient of expansion of said third material.18. A diaphragm in accordance with claim 11 wherein said coefficient of expansion of said second material is less than said coefficient of expansion of said first material.19. A diaphragm in accordance with claim 12 wherein said coefficient of expansion of said second material is less than said coefficient of expansion of said third material.20. A diaphragm in accordance with claim 19 wherein said coefficient of expansion of said first material is larger equal to said coefficient of expansion of said third material.
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