US3922113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metered supply of liquids
Assignee: GEC AEROSPACE Ltd
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Filing: 1974-07-11
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Granted: 1975-11-25
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Expires: 1994-07-11
Abstract
Abstract In a liquid-supply system in which part of the delivery of a fixed-delivery pump is, as spill flow, returned to the pump inlet, the re-introduction is effected by a variable-geometry injector device to achieve, over a relatively wide range of spill ratios, effective utilisation of the spill-flow energy to raise the inlet pressure of the fixed-delivery pump. Conveniently this geometry adjustment is arranged to be utilised simultaneously for the adjustment of the spill ratio by injecting the spill flow in the form of a hollow converging cone formed between an inner cone wall surface of a valve housing and an outer cone surface of a head portion provided on a valve member which is slidable in the valve housing towards and away from the inner cone wall under the action of a signal pressure communicated via a line from a consumption control system to a chamber, in which it acts against a spring, on a diaphragm connected to the valve member.
Inventors
- 👤 Horace George Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:28
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/06; F04C15/062; F04F; F04F5/00; F04F5/44; F04F5/48
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
288 words
A system for the metered supply, to a load, of liquid under pressure, which comprises: a source of liquid; a delivery line for the supply of such liquid to the load; a positivedisplacement pump having a pump inlet and a pump outlet; delivery-control means having an inlet connected to said pump outlet, a main outlet connected to said delivery line, and a spill outlet arranged to receive substantially all the liquid delivered by said pump except for the liquid which is received by said main outlet, said delivery-control means being operative to variably control the flow to the load through said delivery line by varying the portion of the liquid from said pump outlet received by said spill outlet; and an injector device having a housing formed with an interaction chamber and with a combinedflow outlet extending from said chamber, a main-flow inlet connected to said source, and a power-flow inlet connected to said spill outlet to receive all the liquid passing through said spill outlet, both said inlets leading into said interaction chamber, and said pump inlet being so connected to said combinedflow outlet as to receive all the flow from said outlet and no other flow, said injector device further including a geometryvarying element having a passage in which one of said inlets terminates said passage in said geometry varying element coaxially facing said combined-flow outlet, said geometry-varying element being axially displaceable relative to said combined-flow outlet; and actuating means which automatically displace, in accordance with operation of the delivery-control means to provide a different rate of spill flow, said geometry-varying element in the direction in which the resulting geometry variation improves the pressure-raising effect of the injector device at said different rate of spill flow.
Claim 2
Independent Claim
288 words
A system for the metered supply, to a load, of liquid under pressure, which comprises: a source of liquid; a delivery line for the supply of such liquid to the load; a positivedisplacement pump having a pump inlet and a pump outlet; delivery-control means having an inlet connected to said pump outlet, a main outlet connected to said delivery line, and a spill outlet arranged to receive substantially all the liquid delivered by said pump except for the liquid which is received by said main outlet, said delivery-control means being operative to variably control the flow to the load through said delivery line by varying the portion of the liquid from said pump outlet received by said spill outlet; and an injector device having a housing formed with an interaction chamber and with a combinedflow outlet extending from said chamber, a main-flow inlet connected to said source, and a power-flow inlet connected to said spill outlet to receive all the liquid passing through said spill outlet, both said inlets leading into said interaction chamber, and said pump inlet being so connected to said combinedflow outlet as to receive all the flow from said outlet and no other flow, said injector device further including a geometryvarying element having a passage in which one of said inlets terminates said passage in said geometry varying element coaxially facing said combined-flow outlet, said geometry-varying element being axially displaceable relative to said combined-flow outlet; and actuating means which automatically displace, in accordance with operation of the delivery-control means to provide a different rate of spill flow, said geometry-varying element in the direction in which the resulting geometry variation improves the pressure-raising effect of the injector device at said different rate of spill flow.
Claim 3
Dependent Claim
17 words
A system as claimed in claim 1, which includes a pressure-sensitive actuating device for the geometry-varying element.
Claim 4
Dependent Claim
53 words
A system as claimed in claim 1, for the metered supply of liquid fuel to a gas-turbine engine of an aircraft, wherein said delivery-control means are fuel-regulator means operative to pass through said spill outlet the excess of the fuel delivered by said positive-displacement pump over the momentary fuel requirement of the engine.
Claim 5
Dependent Claim
83 words
A system as claimed in claim 3, wherein said geometry-varying element co-operates with the injector housing to form jointly therewith a variable-area restrictor for the flow through said injector device, and which includes a pressure-sensitive actuating device for said geometry-varying element, said fuel-regulating means being arranged to have a pressure outlet connected to said pressure-sensitive actuating device to control the setting of said geometry-varying element and thus to control the flow through said spill outlet by variation of the area of said restrictor.
Claim 6
Dependent Claim
33 words
A system as claimed in claim 1, wherein said geometry-varying element co-operates with the housing of the injector device to form jointly therewith a variable-area restrictor for the flow through said injector device.
Claim 7
Dependent Claim
67 words
A system as claimed in claim 1, wherein said combined-flow outlet has a peripheral wall surface extending from said chamber, and said geometry-varying element has an outer wall surface co-operating with said peripheral wall surface to form jointly therewith an annular orifice, at least one of said wall surfaces being tapered so that axial displacement of said geometry-varying element will vary the size of said annular orifice.
Claim 8
Dependent Claim
64 words
A system as claimed in claim 1, wherein the inlet terminating in said geometry-varying element is the main-flow inlet, said element being formed with a coaxial cone surface, while a complementary cone surface is provided at said combined-flow outlet to form with the first-mentioned cone surface an annular nozzle of adjustably variable radial width, the power-flow inlet being arranged to terminate in this nozzle.
Claim 9
Dependent Claim
53 words
A system as claimed in claim 7, which further comprises an actuating device for said geometry-varying element, said actuating device including an enclosure forming a chamber and having a movable wall member, and means at least operatively connecting said wall member to the member on which one of said cone surfaces is provided.
Claim 10
Dependent Claim
44 words
A system as claimed in claim 8, wherein said main inlet extends to the passage in the geometry-varying element substantially in a straight line coaxial with the said passage, and wherein said connecting means are arranged wholly outside the cross-section of said main-flow inlet.
Claim 11
Dependent Claim
67 words
A system as claimed in claim 8, wherein the geometry-varying element is equipped with a coaxial stem, said movable wall surface being fixed to said coaxial stem and wherein said passage extends from a point inside the stem to the end facing said combined-flow outlet, said stem having an aperture establishing communication between the main-flow inlet of the injector device and the said passage in said stem.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |