Patent US3718837A successfully refreshed from Google Patents.
US3718837A
Expired / Lapsed
US
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Control system for an extraction turbine system
Assignee: Toshiba Corp
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Filing: 1972-04-17
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Granted: 1973-02-27
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Expires: 1992-04-17
Abstract
Abstract A control system for an elastic fluid turbine having a high pressure turbine stage and a motive fluid flow thereto regulated by a main control valve, and a low pressure turbine stage to which the flow of motive fluid is controlled by an interstage control valve. A speed/load control arrangement controls the main and interstage control valves in the same directions responsive to rotational speed of the turbine and a pressure control arrangement controls the valves respectively in opposite directions responsive to the pressure of extracted motive fluid. The control of the main control valve by the pressure control arrangement is interrupted when the load of the turbine system is lost, to prevent overspeed upon such occurrence.
Inventors
- 👤 M Yokota
- 👤 H Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:26
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/02; F01K; F01K7/00; F01K7/34; F01K7/345
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
156 words
A control system for an extraction turbine system having a high and low pressure turbine stages and driving a mechanical load comprising: main control valve means for regulating the flow rate of a motive fluid from a motive fluid generator to said high pressure turbine stage; interstage control valve means for regulating the flow rate of the motive fluid from said high pressure turbine stage to said low pressure turbine stage; a speed/load control arrangement for controlling said main and said interstage control valve means in the same direction to each other in response to the rotational speed of said turbine; a pressure control arrangement for controlling said main and said interstage control valve means in opposite directions to each other in response to a pressure of the extracted steam; and means for interrupting the control of said main control valve means by said pressure control arrangement when said mechanical load of the turbine is removed.
Claim 2
Dependent Claim
156 words
A control system for an extraction turbine system having a high and low pressure turbine stages and driving a mechanical load comprising: main control valve means for regulating the flow rate of a motive fluid from a motive fluid generator to said high pressure turbine stage; interstage control valve means for regulating the flow rate of the motive fluid from said high pressure turbine stage to said low pressure turbine stage; a speed/load control arrangement for controlling said main and said interstage control valve means in the same direction to each other in response to the rotational speed of said turbine; a pressure control arrangement for controlling said main and said interstage control valve means in opposite directions to each other in response to a pressure of the extracted steam; and means for interrupting the control of said main control valve means by said pressure control arrangement when said mechanical load of the turbine is removed.
Claim 3
Dependent Claim
38 words
A control system as claimed in claim 1 wherein: said mechanical load is an electric generator; and said interrupting means is actuated when a circuit breaker which connects said electric generator to an electric load thereof is opened.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |