US3586458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleed control actuator for gas turbine engine
Assignee: Avco Corp
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Filing: 1969-09-16
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Granted: 1971-06-22
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Expires: 1989-09-16
Abstract
Abstract The disclosure illustrates an actuator which controls the opening and closing of an interstage bleed valve for a gas turbine engine multistage air compressor. The actuator has a power piston and output rod adapted to close the bleed valve in response to pressurization by discharge air from the compressor. A valve assembly is provided in the actuator to control the flow to the power piston and thus control the opening and closing of the bleed valve. The valve assembly maintains the power piston in a position which opens the bleed valve in the absence of an exterior control signal for startup engine-operating conditions. The valve assembly reverses its logic for normal engine-operating conditions and maintains the power piston in a position which closes the bleed valve in the absence of an exterior control signal.
Inventors
- 👤 Paul A Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:54
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
232 words
In a gas turbine engine having a multistage air compressor operable at varying flow conditions and an interstage bleed valve for intermittently discharging air to eliminate surge, an actuator assembly comprising: a housing having a first chamber therein; a power piston displaceable in said chamber and being connected to said bleed valve so that when said piston is in a first position said interstage bleed valve is closed and when said piston is in a second position the interstage bleed valve is open; means acting on one face of said piston for yieldably urging said power piston to said second position, thereby biasing said bleed valve to an open position; a passageway for providing a flow path of pressurized air from the discharge of said compressor to the opposite face of said piston in opposition to said biasing means; a valve element positioned in said passageway for selectively blocking and permitting the flow of pressurized air to said power piston; means positioned in said housing and responsive to exterior control inputs for selectively displacing said valve element between said flow-permitting condition and said flow-blocking condition, said selective displacing means being adapted, in the absence of a control input, to maintain said valve element in a flow-blocking condition for relatively low levels of compressor discharge pressure and to maintain said valve in a flow-permitting condition for relatively high levels of compressor discharge pressure.
Claim 2
Dependent Claim
232 words
In a gas turbine engine having a multistage air compressor operable at varying flow conditions and an interstage bleed valve for intermittently discharging air to eliminate surge, an actuator assembly comprising: a housing having a first chamber therein; a power piston displaceable in said chamber and being connected to said bleed valve so that when said piston is in a first position said interstage bleed valve is closed and when said piston is in a second position the interstage bleed valve is open; means acting on one face of said piston for yieldably urging said power piston to said second position, thereby biasing said bleed valve to an open position; a passageway for providing a flow path of pressurized air from the discharge of said compressor to the opposite face of said piston in opposition to said biasing means; a valve element positioned in said passageway for selectively blocking and permitting the flow of pressurized air to said power piston; means positioned in said housing and responsive to exterior control inputs for selectively displacing said valve element between said flow-permitting condition and said flow-blocking condition, said selective displacing means being adapted, in the absence of a control input, to maintain said valve element in a flow-blocking condition for relatively low levels of compressor discharge pressure and to maintain said valve in a flow-permitting condition for relatively high levels of compressor discharge pressure.
Claim 3
Dependent Claim
145 words
An actuator assembly as in claim 1 wherein: said housing has a second chamber; said valve element is displaceable between an upstream position for blocking flow through said passageway and a downstream position wherein flow is permitted; said selective displacing means comprises: a piston portion extending from said valve element and displaceable in said second chamber; means for yieldably urging said piston portion in a direction to cause said valve element to block pressurized flow to said power piston; means for providing a restricted flow path from the upstream end of said valve element to one side of said piston portion thereby providing a bleed flow of pressurized air to one end of said second chamber; valve means for permitting flow from the said end of the second chamber to a low-pressure discharge and responsive to said exterior control input for selectively blocking bleed flow.
Claim 4
Dependent Claim
31 words
An actuator assembly as in claim 2 wherein said valve means comprises a pilot solenoid valve adapted to block bleed flow from said second chamber in response to an electrical signal.
Claim 5
Dependent Claim
29 words
An actuator as in claim 3 wherein said pilot solenoid valve is yieldably urged towards a position which permits bleed flow in the absence of an exterior electrical signal.
Claim 6
Dependent Claim
86 words
An actuator as in claim 1 wherein: said passageway has an inlet extending to a central chamber and a first outlet extending from said chamber to the one face of said power piston and a second outlet extending to a low-pressure discharge; said valve element is bistable in two closely spaced positions, the first of which permits flow from the inlet to the first outlet and the second of which blocks flow from said inlet and permits flow from said first outlet to said second outlet.
Claim 7
Dependent Claim
61 words
An actuator as in claim 5 wherein: said first inlet and said second outlet are in line with one another; said valve element comprises a spherical portion positioned between the inlet and the second outlet and a stem portion extending from the spherical portion through said second outlet, said spherical portion being selectively displaceable against the inlet and the second outlet.
Claim 8
Dependent Claim
146 words
An actuator assembly as in claim 6 wherein: said housing has a second chamber; said valve element is displaceable between an upstream position for blocking flow through said passageway and a down stream position wherein flow is permitted; said selective displacing means comprises: a piston portion extending from said valve element and displaceable in said second chamber; means for yieldably urging said piston portion in a direction to cause said valve element to block pressurized flow to said power piston; means for providing a restrictive flow path from the upstream end of said valve element to one side of said piston portion thereby providing a bleed flow of pressurized air to one end of said second chamber; valve means for permitting flow from the said end of the second chamber to a low-pressure discharge and responsive to said exterior control input for selectively blocking bleed flow.
Claim 9
Dependent Claim
52 words
An actuator assembly as in claim 7 wherein said valve means comprises a pilot solenoid valve adapted to block bleed flow from said second chamber in response to an electrical signal, said solenoid valve being yieldably urged towards a position which permits bleed flow in the absence of an exterior electrical signal.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |