Patent US3648460A successfully refreshed from Google Patents.
US3648460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine fuel control system
Assignee: Rolls Royce PLC
•
Filing: 1970-11-13
•
Granted: 1972-03-14
•
Expires: 1990-11-13
Abstract
Abstract The invention concerns a gas turbine engine fuel control system comprising a first burner supply conduit and at least one second burner supply conduit, a fuel pump which communicates with both said conduits so as to be adapted to supply fuel thereto, first and second restrictors respectively provided in the first and second burner supply conduits, a flow control valve which is connected in the first burner supply conduit downstream of the first restrictor, the flow control valve controlling fuel flow therethrough in dependence upon the value of at least one engine variable, and valve means in the second burner supply conduit downstream of the second restrictor therein, the valve means being controlled in dependence upon the difference in the pressure in the first burner supply conduit downstream of the first restrictor and upstream of the flow control valve, and the pressure downstream of the second restrictor.
Inventors
- 👤 Christopher Linley Johnson
- 👤 John Robert William Whitmarsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:09
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/08; F02K3/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
A gas turbine engine fuel control system comprising a first burner supply conduit and at least one second burner supply conduit, a fuel pump which communicates with both said conduits so as to be adapted to supply fuel thereto, first and second restrictors respectively provided in the first and second burner supply condUits, a flow control valve which is connected in the first burner supply conduit downstream of the first restrictor, the flow control valve controlling fuel flow therethrough in dependence upon the value of at least one engine variable, and valve means in the second burner supply conduit downstream of the second restrictor therein, the valve means being controlled in dependence upon the difference in the pressure in the first burner supply conduit downstream of the first restrictor and upstream of the flow control valve, and the pressure downstream of the second restrictor.
Claim 2
Dependent Claim
144 words
A gas turbine engine fuel control system comprising a first burner supply conduit and at least one second burner supply conduit, a fuel pump which communicates with both said conduits so as to be adapted to supply fuel thereto, first and second restrictors respectively provided in the first and second burner supply condUits, a flow control valve which is connected in the first burner supply conduit downstream of the first restrictor, the flow control valve controlling fuel flow therethrough in dependence upon the value of at least one engine variable, and valve means in the second burner supply conduit downstream of the second restrictor therein, the valve means being controlled in dependence upon the difference in the pressure in the first burner supply conduit downstream of the first restrictor and upstream of the flow control valve, and the pressure downstream of the second restrictor.
Claim 3
Dependent Claim
28 words
A fuel control system as claimed in claim 1 comprising manually controllable flow area varying means for varying the relative flow areas of the first and second restrictors.
Claim 4
Dependent Claim
38 words
A fuel control system as claimed in claim 2 in which the degree to which the flow area varying means vary the flow area of the second restrictor depends upon the value of at least one engine variable.
Claim 5
Dependent Claim
36 words
A fuel control system as claimed in claim 3 in which the degree to which the flow area varying means vary the flow area of the second restrictor depends upon the ratio of two engine pressures.
Claim 6
Dependent Claim
31 words
A fuel control system as claimed in claim 3 in which the second restrictor comprises a needle valve, the flow area varying means comprising a linkage for adjusting the needle valve.
Claim 7
Dependent Claim
84 words
A fuel control system as claimed in claim 5 in which the linkage comprises a manually movable lever movement of which adjusts the needle valve, the manually movable lever having a movable fulcrum whose position affects the extent to which manual adjustment of the manually movable lever adjusts the needle valve, the manually movable lever being connected to servo means responsive to the value of at least one engine variable so that the position of the said movable fulcrum depends upon the said value.
Claim 8
Dependent Claim
41 words
A fuel control system as claimed in claim 6 in which the first burner supply conduit communicates, on the downstream side of the flow control valve, with a bleed valve, means being provided for varying the flow through the bleed valve.
Claim 9
Dependent Claim
29 words
A fuel control system as claimed in claim 7 in which the last-mentioned means increase the flow through the bleed valve with increasing movement of the manually movable lever.
Claim 10
Dependent Claim
35 words
A fuel control system as claimed in claim 1 in which means are provided for positioning the flow control valve in functional dependence upon the ratio of a compressor pressure and a jet pipe pressure.
Claim 11
Dependent Claim
35 words
A fuel control system as claimed in claim 1 in which means are provided for controlling the fuel pump in dependence upon both engine rotational speed and the pressure drop across the flow control valve.
Claim 12
Dependent Claim
43 words
A fuel control system as claimed in claim 1 in which both the valve means and the flow control valve are axially movable, common means being provided for rotating both the valves means and the flow control valve to assist axial movement thereof.
Claim 13
Dependent Claim
41 words
A fuel control system as claimed in claim 1 in which the valve means and the flow control valve are mounted in a space in a common housing, which space communicates with the first burner supply conduit to receive fuel therefrom.
Claim 14
Dependent Claim
50 words
A fuel control system as claimed in claim 1 in which the first burner supply conduit is arranged to supply fuel to pilot burners of a reheat system in the jet pipe of the engine, a said second burner supply conduit being arranged to supply fuel to main burners thereof.
Claim 15
Dependent Claim
34 words
A fuel control system as claimed in claim 13 in which there is a further said second burner supply conduit which is arranged to supply fuel to burners disposed in a bypass air stream.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |