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Patent US3849020A successfully refreshed from Google Patents.
US3849020A
Expired / Lapsed
US
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Fluidic compressor air bleed valve control apparatus
Assignee: Bendix Corp
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Filing: 1973-09-13
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Granted: 1974-11-19
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Expires: 1993-09-13
Abstract
Abstract Gas turbine engine compressor air bleed valve control apparatus includes a flow circuit having two series flow restrictions through which a small flow of compressor pressurized air is vented from the compressor air bleed location to the compressor air inlet and between which restrictions a reference air pressure is generated. During an engine acceleration compressor discharge air pressure is compared to the reference air pressure and, upon reaching a predetermined ratio of the same corresponding to a selected engine speed, the bleed valve is actuated in a closing direction to maintain the predetermined ratio constant as engine acceleration continues until a second engine speed is attained at which the bleed valve is closed. The engine speed at which the bleed valve actuation is initiated and the range of engine speeds required to fully close the bleed valve may be varied to suit requirements of a given engine.
Inventors
- 👤 J Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207; F04D27/023; F04D27/0215; F04D27/0223; Y; Y10; Y10S; Y10S2/00; Y10S2/908; Y10S2/909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
275 words
Gas turbine engine air compressor bleed valve apparatus comprising: valve means operatively connected to said air compressor for venting compressor pressurized air from a compressor stage intermediate the compressor inlet and outlet to a relatively lower pressure air source; first pressure responsive means responsive to the pressure differential between said compressor pressurized air and said relatively lower pressure air operatively connected to said valve means for actuating the same in an opening direction; second pressure responsive means responsive to the pressure differential between a control air pressure and said relatively lower air pressure operatively connected to said valve means for actuating the same in a closing direction; a first passage having first and second series flow restrictions communicating compressor discharge air with a relatively lower pressure air source; a second passage having third and fourth series flow restrictions communicating compressor pressurized air from said intermediate stage to compressor inlet air; fluid pressure differential responsive control means responsive to the pressure differential between a first fluid pressure generated between said first and second flow restrictions which varies as a predetermined function of compressor pressure ratio and thus compressor corrected rotational speed and a second fluid pressure generated between said third and fourth flow restrictions said control means adapted to control said control air pressure in proportion to said fluid pressure differential derived from said first and second fluid pressures; said valve means being actuated to a fully open position in response to said control air pressure at compressor corrected rotational speeds below a predetermined valve and progressively actuated to a fully closed position over a predetermined range of compressor corrected rotational speeds during an engine acceleration.
Claim 2
Dependent Claim
275 words
Gas turbine engine air compressor bleed valve apparatus comprising: valve means operatively connected to said air compressor for venting compressor pressurized air from a compressor stage intermediate the compressor inlet and outlet to a relatively lower pressure air source; first pressure responsive means responsive to the pressure differential between said compressor pressurized air and said relatively lower pressure air operatively connected to said valve means for actuating the same in an opening direction; second pressure responsive means responsive to the pressure differential between a control air pressure and said relatively lower air pressure operatively connected to said valve means for actuating the same in a closing direction; a first passage having first and second series flow restrictions communicating compressor discharge air with a relatively lower pressure air source; a second passage having third and fourth series flow restrictions communicating compressor pressurized air from said intermediate stage to compressor inlet air; fluid pressure differential responsive control means responsive to the pressure differential between a first fluid pressure generated between said first and second flow restrictions which varies as a predetermined function of compressor pressure ratio and thus compressor corrected rotational speed and a second fluid pressure generated between said third and fourth flow restrictions said control means adapted to control said control air pressure in proportion to said fluid pressure differential derived from said first and second fluid pressures; said valve means being actuated to a fully open position in response to said control air pressure at compressor corrected rotational speeds below a predetermined valve and progressively actuated to a fully closed position over a predetermined range of compressor corrected rotational speeds during an engine acceleration.
Claim 3
Dependent Claim
162 words
Gas turbine engine air compressor air bleed valve apparatus as claimed in claim 1 wherein: said fluid pressure differential rEsponsive control means includes a source of compressor pressurized air; a pair of outlet ports one of which is vented to said second pressure responsive means and the other of which is vented to a relatively low pressure drain air source; a deflectable air jet derived from said last named compressor pressurized air and directed toward said outlet ports to pressure the same to a variable degree depending upon the deflection thereof; and a pair of opposed control air ports one of which is connected to said first passage intermediate said first and second restrictions and the other of which is connected to said second passage intermediate said third and fourth restrictions; said deflectable air jet being responsive to the air pressure differential between said pair of control air ports and having a null position in response to a zero pressure differential therebetween.
Claim 4
Dependent Claim
62 words
Gas turbine engine air compressor air bleed valve apparatus as claimed in claim 2 wherein: said other outlet port is connected to said relatively low pressure drain air source via a third passage containing a fifth restriction; said outlet port vented to said second pressure responsive means is further vented via a restriction to said third passage upstream from said fifth restriction.
Claim 5
Dependent Claim
21 words
Gas turbine engine air compressor air bleed valve apparatus as claimed in claim 1 wherein: said second restriction is a venturi.
Claim 6
Dependent Claim
22 words
Gas turbine engine air compressor air bleed valve apparatus as claimed in claim 1 wherein: said second and fourth restrictions are venturis.
Claim 7
Dependent Claim
24 words
Gas turbine engine air compressor bleed valve apparatus as claimed in claim 1 wherein: said relatively lower pressure air source is compressor inlet air.
Claim 8
Dependent Claim
36 words
Gas turbine engine air compressor air bleed apparatus as claimed in claim 1 wherein: said valve means is a poppet valve; said first pressure responsive means is defined by the head portion of said poppet valve.
Claim 9
Dependent Claim
28 words
Gas turbine engine air compressor air bleed apparatus as claimed in claim 7 wherein: said second pressure responsive means is a diaphragm fixedly secured to said poppet valve.
Claim 10
Dependent Claim
25 words
Gas turbine engine air compressor air bleed apparatus as claimed in claim 1 wherein: said first and second restrictions have a predetermined fixed area ratio.
Claim 11
Dependent Claim
37 words
Gas turbine engine air compressor air bleed apparatus as claimed in claim 1 wherein: said first and second restrictions have a predetermined fixed area ratio; and said third and fourth restrictions have a predetermined fixed area ratio.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |