US3828814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control arrangement for gas or steam turbines
Assignee: BERGMANN BORSIG VEB
•
Filing: 1972-10-16
•
Granted: 1974-08-13
•
Expires: 1992-10-16
Abstract
Abstract The basic flow rate for any given output is controlled by main valves driven by a relatively slow electrical drive having a high operating force. Small output changes are rapidly corrected by error valves driven by an electrical system having a very short time constant and a relatively low operating force. Only one error valve is used for correcting flow rate in conjunction with any of the main valves. All valves operate under spring pressure, so that release of a mechanical coupling coupling the valves to the drive system causes a very rapid closing of the valves.
Inventors
- 👤 K Neumann
- 👤 W Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:03
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/20; F01D17/22; F01D17/24; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7761; Y10T137/8593; Y10T137/87265; Y10T137/87298; Y10T137/87306; Y10T137/87314
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
301 words
In a turbine having an operating medium and furnishing an output, a system for changing the rate of flow of said operating medium to compensate for changes in said output from a desired output, comprising, in combination, at least one basic flow control means for regulating said flow of said operating medium to a base flow rate corresponding to said desired output, said basic flow control means having a predetermined maximum flow rate capacity; first electrical drive means for driving said basic flow control means, said first electrical drive means having a determined maximum operating speed and a determined maximum operating force; error flow control means responsive to said changes in said output for furnishing, within predetermined flow rate limits, changes in said flow rate around said base flow rate to compensate for said changes in said output, said error flow rate control means having a determined maximum flow rate capacity substantially less than said determined maximum flow rate capacity of said basic flow control means; second electrical drive means for driving said error flow control means, said second electrical drive means having a determined operating speed substantially higher than said determined operating speed of said basic flow control means and a determined maximum operating force substantially less than said determined maximum operating force of said basic flow control means; and coupling means for coupling said basic and said error flow control means to said first and second electrical drive means respectively, whereby said first flow control means and said first electrical drive means constitute a relatively low speed high capacity system for regulating the base flow rate while said error flow control means and said second electrical drive means together constitute a relatively low capacity high speed system for compensating for said changes in said output from a desired output.
Claim 2
Dependent Claim
301 words
In a turbine having an operating medium and furnishing an output, a system for changing the rate of flow of said operating medium to compensate for changes in said output from a desired output, comprising, in combination, at least one basic flow control means for regulating said flow of said operating medium to a base flow rate corresponding to said desired output, said basic flow control means having a predetermined maximum flow rate capacity; first electrical drive means for driving said basic flow control means, said first electrical drive means having a determined maximum operating speed and a determined maximum operating force; error flow control means responsive to said changes in said output for furnishing, within predetermined flow rate limits, changes in said flow rate around said base flow rate to compensate for said changes in said output, said error flow rate control means having a determined maximum flow rate capacity substantially less than said determined maximum flow rate capacity of said basic flow control means; second electrical drive means for driving said error flow control means, said second electrical drive means having a determined operating speed substantially higher than said determined operating speed of said basic flow control means and a determined maximum operating force substantially less than said determined maximum operating force of said basic flow control means; and coupling means for coupling said basic and said error flow control means to said first and second electrical drive means respectively, whereby said first flow control means and said first electrical drive means constitute a relatively low speed high capacity system for regulating the base flow rate while said error flow control means and said second electrical drive means together constitute a relatively low capacity high speed system for compensating for said changes in said output from a desired output.
Claim 3
Dependent Claim
90 words
A system as set forth in claim 1, wherein said basic flow control means comprise at least first and second basic flow control valve means furnishing, respectively, a first and second base flow rate corresponding to a first and second desired output; and wherein said error flow control means comprise common error valve means operative with said first basic flow control valve means when said turbine is furnishing said first desired output and with said second basic flow control valve means when said turbine is furnishing said second desired output.
Claim 4
Dependent Claim
66 words
A system as set forth in claim 1, further comprising regulating signal furnishing means for furnishing an electrical regulating signal, including an error signal corresponding to said changes of said output from said desired output; means connecting said regulating signal furnishing means to said first and second electrical drive means; and delay means interconnected between said regulating signal furnishing means and said first electrical drive means.
Claim 5
Dependent Claim
50 words
A system as set forth in claim 3, further comprising threshold circuit means interconnected between said regulating signal furnishing means and said first drive means for bypassing said delay means and furnishing said regulating signal directly to said first drive means when said error signal exceeds a predetermined error signal.
Claim 6
Dependent Claim
65 words
A system as set forth in claim 3, further comprising threshold circuit means interconnected between said regulating signal furnishing means and said first electrical drive means for bypassing said delay means and furnishing said regulating signal directly to said first drive means when said error signal exceeds a predetermined error signal corresponding to said determined maximum flow rate capacity of said error flow control means.
Claim 7
Dependent Claim
55 words
A system as set forth in claim 1, wherein said coupling means comprise mechanical coupling means adapted to decouple in response to a decoupling signal; further comprising spring means coupled to said basic and said error flow cOntrol means, for rapidly closing said basic and error flow control means upon decoupling of said coupling means.
Claim 8
Dependent Claim
82 words
A system as set forth in claim 2 wherein said common error valve means comprise a first error valve for increasing said flow of said operating medium and a second error valve for decreasing said flow of said operating medium, each of said two error valves being connected with one of two special groups of nozzles of the turbine inlet said first and second error valves having, respectively a fully closed and fully open position when said output is said desired output.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |