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US5326221A
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Over-cambered stage design for steam turbines
Assignee: General Electric Co
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Filing: 1993-08-27
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Granted: 1994-07-05
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Expires: 2013-08-27
Abstract
Abstract Steam turbine nozzle blades and buckets are profiled in accordance with Tables I and II or multiples of the X,Y and R coordinates of the charts. The profiles of the nozzle blades impose a parabolic flow distribution at the throat and the buckets accommodate the incoming flow. The nozzle blades and buckets are over-cambered at their roots and tips to constrict flow from the roots and tips into the mid-regions of the blades and buckets. Improved aerodynamic efficiencies are obtained by directing the flow away from the end walls of the blades and buckets toward the efficient mid-region of the blades and buckets whereby flow velocity and angle leaving the nozzle has a non-linear distribution and the bucket velocity leaving angles are similarly non-linear.
Inventors
- 👤 Joseph W. Amyot
- 👤 Stephen G. Ruggles
- 👤 Philip F. Berrahou
- 👤 Robert J. Orlando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
F; F01; F01D; F01D1/00; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/145; F05; F05D; F05D2240/00; F05D2240/20; F05D2240/30; F05D2240/301
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A nozzle for a steam turbine having a pair of adjacent blades having leading and trailing edges, blade bodies therebetween, and root and tip portions with a mid-region therebetween, said adjacent blades defining a throat therebetween measured by a series of straight lines extending from the trailing edges of a blade to the closest adjacent surface along the body of the adjacent blade and defining a pitch in the circumferential spacing between blades, the ratios of the throat to the pitch at successive profiles along said blades increasing from the root portions toward a mid-blade region and then decreasing from the mid-blade region to the tip portion, the blades being one of nozzle or bucket blades.
Claim 2
Dependent Claim
116 words
A nozzle for a steam turbine having a pair of adjacent blades having leading and trailing edges, blade bodies therebetween, and root and tip portions with a mid-region therebetween, said adjacent blades defining a throat therebetween measured by a series of straight lines extending from the trailing edges of a blade to the closest adjacent surface along the body of the adjacent blade and defining a pitch in the circumferential spacing between blades, the ratios of the throat to the pitch at successive profiles along said blades increasing from the root portions toward a mid-blade region and then decreasing from the mid-blade region to the tip portion, the blades being one of nozzle or bucket blades.
Claim 3
Dependent Claim
15 words
A nozzle for a steam turbine having a blade profile in accordance with Table I.
Claim 4
Dependent Claim
15 words
A nozzle for a steam turbine having a blade profile in accordance with Table I.
Claim 5
Dependent Claim
35 words
A stage for a steam turbine having a plurality of nozzles each having a blade profile according to claim 2 and a plurality of buckets each having a bucket profile in accordance with Table II.
Claim 6
Dependent Claim
27 words
A nozzle for a steam turbine having nozzle blade profiles in accordance with Table I scaled by multiplying X,Y and R coordinates thereof by a predetermined number.
Claim 7
Dependent Claim
27 words
A nozzle for a steam turbine having nozzle blade profiles in accordance with Table I scaled by multiplying X,Y and R coordinates thereof by a predetermined number.
Claim 8
Dependent Claim
47 words
A stage for a steam turbine having a plurality of nozzles each having a blade profile according to claim 4 and a plurality of buckets each having a bucket profile in accordance with Table II scaled by multiplying X,Y and R coordinates thereof by said predetermined number.
Claim 9
Dependent Claim
15 words
A bucket for a steam turbine having a bucket profile in accordance with Table II.
Claim 10
Dependent Claim
15 words
A bucket for a steam turbine having a bucket profile in accordance with Table II.
Claim 11
Dependent Claim
35 words
A bucket for a steam turbine having a bucket profile in accordance with Table II scaled by multiplying X,Y and R coordinates thereof by a predetermined number. blades being one of nozzle or bucket blades.
Claim 12
Dependent Claim
35 words
A bucket for a steam turbine having a bucket profile in accordance with Table II scaled by multiplying X,Y and R coordinates thereof by a predetermined number. blades being one of nozzle or bucket blades.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |