US3682192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic control systems
Assignee: Plessey Overseas Ltd
•
Filing: 1970-08-20
•
Granted: 1972-08-08
•
Expires: 1990-08-20
Abstract
Abstract A gas turbine has a fluidic control system having a fluidic bistable element which controls a switch actuator. The vent of the bistable element is fed to a venturi tube. The throat of the venturi tube is connected to one control inlet of the bistable element, the venturi being vented to a pressure equal to or less than the pressure applied to the inlet of the bistable element. The control system is operative to trigger the actuator which in turn controls the gas turbine when the ratio of main inlet pressure of the bistable element to the pressure at the second control inlet falls below a predetermined value; the pressures being respectively taken from the high pressure compression stage and the fan stage of the gas turbine compressor.
Inventors
- 👤 Guy E Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:51
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; F04; F04D; F04D27/00; F04D27/02; F04D27/0207; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071; Y10T137/218
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
A fluidic control system comprising a fluidic actuator having first and second inlets, a fluidic element having an inlet for receiving a first fluid pressure, two control inlets for respectively receiving second and third fluid pressures and first and second outlets which are respectively connected to the first and second inlets of the fluid actuator, said first pressure inlet, control inlets and first and second outlets being connected to interaction chamber means for producing outlet pressures at said first and second outlets responsive to the pressure difference at the two control inlets to control the fluidic actuator in dependence thereon, a venturi tube having an inlet and throat, first means connecting the inlet of the venturi tube to receive a fluid pressure derived from and proportional to said first fluid pressure, and second means connecting the throat to one of said two control inlets of the fluidic element to communicate the second fluid pressure to the said one inlet and means for communicating the third fluid pressure to the other control inlet in an opposing sense whereby to cause the fluidic actuator to operate when the ratio of the first to the third fluid pressures reaches a predetermined value.
Claim 2
Dependent Claim
199 words
A fluidic control system comprising a fluidic actuator having first and second inlets, a fluidic element having an inlet for receiving a first fluid pressure, two control inlets for respectively receiving second and third fluid pressures and first and second outlets which are respectively connected to the first and second inlets of the fluid actuator, said first pressure inlet, control inlets and first and second outlets being connected to interaction chamber means for producing outlet pressures at said first and second outlets responsive to the pressure difference at the two control inlets to control the fluidic actuator in dependence thereon, a venturi tube having an inlet and throat, first means connecting the inlet of the venturi tube to receive a fluid pressure derived from and proportional to said first fluid pressure, and second means connecting the throat to one of said two control inlets of the fluidic element to communicate the second fluid pressure to the said one inlet and means for communicating the third fluid pressure to the other control inlet in an opposing sense whereby to cause the fluidic actuator to operate when the ratio of the first to the third fluid pressures reaches a predetermined value.
Claim 3
Dependent Claim
30 words
A system according to claim 1 wherein said fluidic element has an exhaust vent and in which the first means directly couples the exhaust vent to the venturi tube inlet.
Claim 4
Dependent Claim
27 words
A system according to claim 1 wherein the first means comprises a variable orifice through which the first fluid pressure is communicated to said venturi tube inlet.
Claim 5
Dependent Claim
26 words
A system according to claim 1 wherein the fluidic element comprises a bistable fluidic element which controls the operation of the actuator in an ON/OFF mode.
Claim 6
Dependent Claim
33 words
A system according to claim 1 wherein the fluidic element comprises a proportional fluidic amplifier which controls the operation of the actuator in proportion to the difference between said second and third pressures.
Claim 7
Dependent Claim
60 words
A system according to claim 5 including a variable fluid restrictor connected to the inlet of said fluidic element and means connecting the actuator to the variable fluid restrictor to vary the magnitude of the first pressure applied to the inlet of tHe fluidic element in a sense to maintain the ratio of said first to said third pressure constant.
References Cited (Backward Citations)
US3232095A
Cited
US3392739A
Cited
US3335737A
Cited
US3468326A
Cited
US3572357A
Cited
US3552415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |