US3891353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet boosters
Assignee: British Gas PLC
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Filing: 1973-03-07
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Granted: 1975-06-24
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Expires: 1993-03-07
Abstract
Abstract In a jet booster of the kind in which high pressure driving fluid is used to entrail low pressure fluid induced into the booster, and compress it to an intermediate pressure, efficiency suffers significantly if the booster is operated at other than design conditions which are for a specified volumetric throughput at predetermined fluid pressures. In a more flexible jet booster an axial nozzle by which the driving fluid enters the booster, has a plug which is longitudinally movable in the throat of the nozzle and which varies in cross section along its length so as to change the effective nozzle throat area when the plug is moved longitudinally. Also the mixing throat of the jet booster is lined with a flexible skin sleeve so that a change in inflation pressure in the sleeve alters the cross sectional area of the mixing throat.
Inventors
- 👤 John Joseph Templeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:41
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/48; F04F5/14; F04F5/16; F04F5/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A jet booster of the kind in which high pressure driving fluid is used to entrain low pressure fluid induced into said booster and compress it to an intermediate pressure, comprising an inlet opening for low pressure fluid, an axial driving nozzle within said inlet opening and open to a supply duct for high pressure driving fluid, said driving nozzle defining a nozzle throat and having a nozzle exit by which said driving fluid enters said booster, a plug which is longitudinally movable in said nozzle throat and which varies in cross-section along its length so as to change the effective area of said nozzle throat when said plug is moved longitudinally, a cylindrical portion forming the mixing throat of said booster which is variable in cross-section, first control means for longitudinally moving the plug in said nozzle throat and second control means independent of said first control means and simultaneously but independently variable therewith for varying the cross-section of said cylindrical portion, said second control means including a conduit leading to said supply duct for high pressure driving fluid, said conduit including a pressure controller therein.
Claim 2
Dependent Claim
187 words
A jet booster of the kind in which high pressure driving fluid is used to entrain low pressure fluid induced into said booster and compress it to an intermediate pressure, comprising an inlet opening for low pressure fluid, an axial driving nozzle within said inlet opening and open to a supply duct for high pressure driving fluid, said driving nozzle defining a nozzle throat and having a nozzle exit by which said driving fluid enters said booster, a plug which is longitudinally movable in said nozzle throat and which varies in cross-section along its length so as to change the effective area of said nozzle throat when said plug is moved longitudinally, a cylindrical portion forming the mixing throat of said booster which is variable in cross-section, first control means for longitudinally moving the plug in said nozzle throat and second control means independent of said first control means and simultaneously but independently variable therewith for varying the cross-section of said cylindrical portion, said second control means including a conduit leading to said supply duct for high pressure driving fluid, said conduit including a pressure controller therein.
Claim 3
Dependent Claim
24 words
A jet booster according to claim 1 in which said driving nozzle is convergent so that said nozzle throat is also the nozzle exit.
Claim 4
Dependent Claim
26 words
A jet booster according to claim 1 in which said driving nozzle is of convergent-divergent shape, so that the nozzle throat and nozzle exit are separated.
Claim 5
Dependent Claim
58 words
A jet booster according to claim 3 in which in addition to said plug at said driving nozzle throat, there is provided a second plug which is longitudinally movable in said nozzle exit and varies in cross-section along its length so as to change the effective area of said nozzle exit when said second plug is moved longitudinally.
Claim 6
Dependent Claim
53 words
A jet booster according to claim 1 in which a flexible skin lines said mixing throat of said booster and is sealed to the walls of said mixing throat along each edge to form an inflatable slEeve, a change of inflation pressure in said sleeve altering the cross-sectional area of said mixing throat.
Claim 7
Dependent Claim
36 words
A jet booster according to claim 1 in which a flexible double-skin sleeve lines said mixing throat of said booster, a change of inflation pressure in said sleeve altering the cross-sectional area of said mixing throat.
Claim 8
Dependent Claim
38 words
A jet booster according to claim 1 in which a diffuser is attached downstream of said mixing throat and in which said diffuser is lined with an inflatable flexible sleeve for varying the cross-sectional area of said diffuser.
Claim 9
Dependent Claim
45 words
A jet booster according to claim 1 in which said driving nozzle is movably mounted in said booster, such that it can be moved longitudinally with respect to said mixing throat without significantly affecting the effective area of the inlet opening for low pressure fluid.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |