US4384818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for limiting the end thrust of turbo compressors by means of a blowoff control
Assignee: Gutehoffnungshutte Sterkrade AG
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Filing: 1979-12-06
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Granted: 1983-05-24
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Expires: 1999-12-06
Abstract
Abstract A method of limiting the discharge pressure for turbo compressors by means of a blowoff control which is controlled by an anti-surge controller along with means for measuring the discharge pressure and an extreme value selector as well as means for measuring the pressure flow rate and for generating a signal from a manual controller, comprises, measuring the discharge pressure, comparing the measured pressure with a desired maximum pressure to produce a pressure control signal, measuring the compressor flow rate, comparing the measured flow rate with a minimum permissible flow rate to provide a flow rate control, directing a signal from a manual controller to the value selector to generate a manual controller signal and feeding each of the pressure control signal, flow rate control signal, and manual controller signal to the anti-surge controller to provide a control of the blowoff valve in accordance therewith.
Inventors
- 👤 Wilfried Blotenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:35
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
A method of limiting the discharge pressure of a compressor of the type having a blowoff valve, an anti-surge controller operatively connected to said blowoff valve, means for measuring the discharge pressure, said anti-surge controller being operable to generate an output signal for actuating blowoff, an extreme value selector connected to the anti-surge controller, a manual controller signal-producing device operatively connected to the value selector, and means for measuring the flow rate of the compressor, which comprises, comparing the measured pressure with a desired maximum pressure to produce a pressure control signal, supplying the pressure control signal to the extreme value selector, measuring the flow rate, comparing the measured flow rate with a minimum permissible flow rate to provide a flow rate control signal, supplying the flow rate control signal to the extreme value selector, actuating the manual controller to produce a manual signal, comparing the output signal of the controller with the manual signal to provide a manual-controller signal, directing the pressure control signal, the flow rate control signal and the manual-controller signal to the extreme value selector, and obtaining a control signal in the extreme value selector in accordance with the greatest of the signals being fed thereto for actuating the anti-surge controller.
Claim 2
Independent Claim
205 words
A method of limiting the discharge pressure of a compressor of the type having a blowoff valve, an anti-surge controller operatively connected to said blowoff valve, means for measuring the discharge pressure, said anti-surge controller being operable to generate an output signal for actuating blowoff, an extreme value selector connected to the anti-surge controller, a manual controller signal-producing device operatively connected to the value selector, and means for measuring the flow rate of the compressor, which comprises, comparing the measured pressure with a desired maximum pressure to produce a pressure control signal, supplying the pressure control signal to the extreme value selector, measuring the flow rate, comparing the measured flow rate with a minimum permissible flow rate to provide a flow rate control signal, supplying the flow rate control signal to the extreme value selector, actuating the manual controller to produce a manual signal, comparing the output signal of the controller with the manual signal to provide a manual-controller signal, directing the pressure control signal, the flow rate control signal and the manual-controller signal to the extreme value selector, and obtaining a control signal in the extreme value selector in accordance with the greatest of the signals being fed thereto for actuating the anti-surge controller.
Claim 3
Dependent Claim
47 words
A method, as claimed in claim 1, including measuring the intake pressure of the compressor and multiplying it by a design pressure ratio to provide a desired value, comparing the desired value with the measured pressure signal, and supplying the difference thereof to the extreme value selector.
Claim 4
Dependent Claim
43 words
A method, as set forth in claim 1 or 2, including the step of measuring the actual power, and comparing the actual power with a maximum permissible power to provide a power signal, and supplying the power signal to the extreme value selector.
References Cited (Backward Citations)
US4139328A
Cited
SU700687A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |