US3749048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal divider for speed control of direct reversing gas turbine
Assignee: General Electric Co
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Filing: 1972-03-02
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Granted: 1973-07-31
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Expires: 1992-03-02
Abstract
Abstract A speed control for a direct reversing gas turbine of the type adapted to separately control the flow of motive fluid through two sets of individually adjustable nozzles into forward and reversing blades on the load turbine. A nozzle control derives a command signal for total nozzle flow area from various operating conditions of the gas turbine. The command signal is split into ahead and astern nozzle command signals in a ratio which is determined by comparing propulsion lever position and propeller speed. The system maintains the desired total nozzle opening from the nozzle control, as well as the desired ratio between ahead and astern nozzle opening.
Inventors
- 👤 R Jones
- 👤 W Rowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
B; B63; B63H; B63H21/00; B63H21/22; F; F01; F01D; F01D1/00; F01D1/30; F01D15/00; F01D15/02; F01D15/04; F02; F02C; F02C9/00; F02C9/16; F02C9/20; F02C9/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
In a two shaft direct-reversing gas turbine having a load turbine shaft with forward and reversing blade sections and having forward and reversing nozzle blades for separately and respectively controlling flow therethrough, a control system comprising: means for controlling flow of fuel to said gas turbine in accordance with a selected power setting, a nozzle control providing a first nozzle command signal in response to selected operating conditions of the gas turbine for dividing available power between the gas turbine shafts and representing a desired total nozzle opening of both forward and reverse nozzle blades, means for providing a second signal representing a deviation between a desired load shaft speed and actual load shaft speed, means for dividing said first signal into a forward nozzle command signal and a reverse nozzle command signal in proportions determined by said second signal, and a plurality of positioning servomechanisms setting the positions of said forward and reversing adjustable nozzle blades in accordance with said forward and reverse command signals respectively.
Claim 2
Dependent Claim
167 words
In a two shaft direct-reversing gas turbine having a load turbine shaft with forward and reversing blade sections and having forward and reversing nozzle blades for separately and respectively controlling flow therethrough, a control system comprising: means for controlling flow of fuel to said gas turbine in accordance with a selected power setting, a nozzle control providing a first nozzle command signal in response to selected operating conditions of the gas turbine for dividing available power between the gas turbine shafts and representing a desired total nozzle opening of both forward and reverse nozzle blades, means for providing a second signal representing a deviation between a desired load shaft speed and actual load shaft speed, means for dividing said first signal into a forward nozzle command signal and a reverse nozzle command signal in proportions determined by said second signal, and a plurality of positioning servomechanisms setting the positions of said forward and reversing adjustable nozzle blades in accordance with said forward and reverse command signals respectively.
Claim 3
Dependent Claim
85 words
The combination according to claim 1, wherein said dividing means comprises: A multiplier for obtaining a fractional signal which is equal to the first signal multiplied by a fracTion between 0 and 1, which fraction is proportional to the second signal, A first summing amplifier connected to receive said fractional signal and to supply the reverse nozzle command signal, and A second amplifier connected to receive said first signal and said fractional signal and to supply the difference therebetween as the forward nozzle command signal.
Claim 4
Dependent Claim
48 words
The combination according to claim 1, wherein said means providing said second signal comprises an integrating summing amplifier connected to receive a load shaft speed command signal and an actual load shaft speed signal and to supply the time integral of the difference therebetween as said second signal.
Claim 5
Dependent Claim
39 words
The combination according to claim 1, including a manual control lever and wherein said selected power setting for said fuel flow control means and said load shaft speed command signal are both obtained from the position of said lever.
Claim 6
Dependent Claim
36 words
The combination according to claim 4, wherein said load shaft drives a propellor of a vessel and wherein said control lever is a remote propulsion lever for setting both gas turbine power and propeller speed simultaneously.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |