Patent US3915588A successfully refreshed from Google Patents.
US3915588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-shell axial-plane split casing structure for high-capacity low-pressure sections of a steam turbine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1974-09-05
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Granted: 1975-10-28
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Expires: 1994-09-05
Abstract
Abstract A steam turbine casing for a high-capacity low-pressure section of two-shell construction divided along an axial plane comprises an inner casing in the form of a guide blade carrier to which the guide blades are attached and an outer casing provided with a thermally-resilient lead-through for a steam inlet pipe. The inner casing is constructed from three frustum-shaped shells arranged approximately normal to each other and in the region of the steam inlet pipe are joined to a cylindrical shell through which the steam inlet pipe passes. The inner casing is supported by axially-divided rings fixed respectively to the circumference at the ends of the frustum-shaped shells which have the smaller diameter.
Inventors
- 👤 Kurt Brandstatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:48
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/24; F01D25/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A steam turbine casing for a high-capacity low-pressure section of two-shell construction divided along an axial plane, comprising an inner casing in the form of a guide blade carrier to which the guide blades are attached, and an outer casing provided with a thermally-resilient lead-through for a steam inlet pipe, said inner casing comprising three frustum-shaped shells two of which are arranged approximately normal to the other shell and in the region of said steam inlet pipe the other shell being joined to a cylindrical shell through which said steam inlet pipe passes, said guide blade carrier being supported by axially-divided rings fixed respectively to the circumference at the ends of the frustum-shaped shells which have the smaller diameter.
Claim 2
Dependent Claim
119 words
A steam turbine casing for a high-capacity low-pressure section of two-shell construction divided along an axial plane, comprising an inner casing in the form of a guide blade carrier to which the guide blades are attached, and an outer casing provided with a thermally-resilient lead-through for a steam inlet pipe, said inner casing comprising three frustum-shaped shells two of which are arranged approximately normal to the other shell and in the region of said steam inlet pipe the other shell being joined to a cylindrical shell through which said steam inlet pipe passes, said guide blade carrier being supported by axially-divided rings fixed respectively to the circumference at the ends of the frustum-shaped shells which have the smaller diameter.
Claim 3
Dependent Claim
33 words
A steam turbine casing as claimed in claim 1, in which the frustum-shaped shells of the inner casing are provided at their smaller diameter with a ring flange to accomodate the guide blades.
Claim 4
Dependent Claim
29 words
A steam turbine casing as claimed in claim 1, in which the frustum-shaped shells of the inner casing for the inner rows of guide blades are connected by struts.
Claim 5
Dependent Claim
137 words
A dual-flow center-intake steam turbine casing for high-capacity low-pressure sections of two-shell construction divided along an axial plane, comprising a dual-flow path inner casing in the form of a guide blade carrier to which the guide blades are attached, and an outer casing provided with at least one thermally resilient lead-through for the center-inlet steam pipe, wherein for each flow-path said inner casing essentially comprises three frustum-shaped shells two of which are arranged approximately normal to the other shell and said other shells in the region of the end of said center-inlet steam pipe are joined to the opposite ends of a cylindrical shell through which said center-inlet steam pipe passes, said guide blade carrier being supported by axially-divided rings fixed respectively to the circumference at the ends of the frustum-shaped shells which have the smaller diameter.
Claim 6
Dependent Claim
137 words
A dual-flow center-intake steam turbine casing for high-capacity low-pressure sections of two-shell construction divided along an axial plane, comprising a dual-flow path inner casing in the form of a guide blade carrier to which the guide blades are attached, and an outer casing provided with at least one thermally resilient lead-through for the center-inlet steam pipe, wherein for each flow-path said inner casing essentially comprises three frustum-shaped shells two of which are arranged approximately normal to the other shell and said other shells in the region of the end of said center-inlet steam pipe are joined to the opposite ends of a cylindrical shell through which said center-inlet steam pipe passes, said guide blade carrier being supported by axially-divided rings fixed respectively to the circumference at the ends of the frustum-shaped shells which have the smaller diameter.
Claim 7
Dependent Claim
33 words
A steam turbine casing as claimed in claim 4, in which the frustum-shaped shells of the inner casing are provided at their smaller diameter with a ring flange to accomodate the guide blades.
Claim 8
Dependent Claim
29 words
A steam tUrbine casing as claimed in claim 4, in which the frustum-shaped shells of the inner casing for the inner rows of guide blades are connected by struts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |