US3593736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slug pump and pressurizing valve for fuel control system
Assignee: Colt Industries Operating Corp
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Filing: 1969-05-19
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Granted: 1971-07-20
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Expires: 1989-05-19
Abstract
Abstract A slug pump and pressurizing valve are fluidly interconnected in a starting circuit of a fuel control system for a gas turbine engine. The pressurizing valve fluidly interconnects two segments of the main fuel supply line for providing a regulated pressure in one of the segments. The slug pump is used in the starting operation to expel a volume of fuel contained within the pump and thus momentarily propel a burst of fuel to the engine. The slug pump includes a chamber and either a piston or a diaphragm to expel the fuel. The pressurizing valve has tow springs which bias a piston, the face of which is exposed to the segment of the main fuel supply line in which the fuel pressure is to be regulated. One spring always biases the piston, while the other spring biases the piston only after the piston moves to a predetermined position. When a predetermined pressure is applied to the exposed face of the piston by the main fuel pump, the piston moves upwardly to close off the starting circuit. After a sufficient pressure is applied to the exposed face, the other spring causes the pressure adjacent the exposed face to be regulated.
Inventors
- 👤 Albert H White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
144 words
In a fuel control system, a main fuel supply line operatively associated with a main fuel pump for delivering a fuel flow through said line, and a metering section located in said main fuel supply line downstream of said pump, a starting circuit fluidly communicating with said main fuel supply line at locations upstream and downstream of said pump, and means to generate a fuel flow in said starting circuit, wherein the improvement comprises a pressurizing valve having a fluid connection with said starting circuit and said main fuel supply line, said fluid connection with said main fuel supply line being located intermediate said pump and said metering section, said pRessurizing valve including means to regulate the pressure in said main fuel supply line and further including means responsive to a predetermined pressure in said main fuel supply line to close said starting circuit.
Claim 2
Dependent Claim
144 words
In a fuel control system, a main fuel supply line operatively associated with a main fuel pump for delivering a fuel flow through said line, and a metering section located in said main fuel supply line downstream of said pump, a starting circuit fluidly communicating with said main fuel supply line at locations upstream and downstream of said pump, and means to generate a fuel flow in said starting circuit, wherein the improvement comprises a pressurizing valve having a fluid connection with said starting circuit and said main fuel supply line, said fluid connection with said main fuel supply line being located intermediate said pump and said metering section, said pRessurizing valve including means to regulate the pressure in said main fuel supply line and further including means responsive to a predetermined pressure in said main fuel supply line to close said starting circuit.
Claim 3
Dependent Claim
49 words
A fuel control system according to claim 1, in which said pressure-regulating means comprises a piston slideably mounted for axial movement in a housing, a lateral projection on said piston and a spring-biased member, adapted to be contacted by said projection, slideably mounted for axial movement in said housing.
Claim 4
Dependent Claim
33 words
A fuel control system according to claim 1, in which said pressure-responsive means comprises a spool, on the upper portion of said piston, and a helical compression spring operatively connected to said spool.
Claim 5
Dependent Claim
39 words
A fuel control system according to claim 1, in which the improvement further comprises means in fluid communication with said pressurizing valve responsive to a given signal to momentarily increase the rate of fuel flow in said starting circuit.
Claim 6
Dependent Claim
111 words
In a fuel control system, the combination comprising a main fuel supply line having an inlet and an outlet, a main fuel pump operatively connected to said supply line intermediate said inlet and said outlet to receive an inlet flow and produce a flow in said supply line, a starting circuit having an inlet segment and outlet segment, said inlet segment being connected to said supply line intermediate said inlet and said pump for receiving fuel therefrom, means to prevent a flow from said inlet segment to said outlet segment when the pressure differential across the pump exceeds a predetermined value and to subsequently regulate the pressure differential across the pump.
Claim 7
Dependent Claim
111 words
In a fuel control system, the combination comprising a main fuel supply line having an inlet and an outlet, a main fuel pump operatively connected to said supply line intermediate said inlet and said outlet to receive an inlet flow and produce a flow in said supply line, a starting circuit having an inlet segment and outlet segment, said inlet segment being connected to said supply line intermediate said inlet and said pump for receiving fuel therefrom, means to prevent a flow from said inlet segment to said outlet segment when the pressure differential across the pump exceeds a predetermined value and to subsequently regulate the pressure differential across the pump.
Claim 8
Dependent Claim
137 words
The combination, as defined in claim 5, in which said preventing and regulating means comprises a housing having an inlet port and an outlet port, said inlet and outlet ports being fluidly connected to said inlet and outlet segments, a piston mounted in said housing for axial sliding movement, said housing being located adjacent said supply line and said piston extending into said supply line dividing said supply line into a first segment and a second segment, said piston being movable to a position preventing communication between said inlet and outlet ports to thereby close said starting circuit, first spring means to bias said piston to a position in which said inlet and outlet ports are in communication and second spring means to permit said piston to regulate said pressure differential after closure of said starting circuit.
Claim 9
Dependent Claim
76 words
The combination, as defined in claim 6, in which said first spring means comprises a spool integral with said piston, an abutment on said spool, a first spring interposed between said abutment and said housing, and in which said second spring means comprises a member slideably mounted in said housing, a second spring interposed between said member and said housing, and a projection on said piston adapted to contact said member during movement of said piston.
Claim 10
Dependent Claim
25 words
The combination, as defined in claim 6, in which said piston includes a passage fluidly interconnecting said first and second segments of said supply line.
Claim 11
Dependent Claim
200 words
In a fuel control system, a main fuel supply line, a boost pump for supplying fuel to the inlet of the main fuel supply line, a main fuel pump operatively connected to said main fuel supply line for producing a fuel flow therein, a starting circuit having an inlet segment and an outlet segment for delivering a starting fuel flow, said inlet segment being connected to said main fuel supply line intermediate said boost pump and said main fuel pump for receiving fuel therefrom, a slug pump having a chamber therein, said chamber being operatively connected to said starting circuit for receiving flow from said inlet segment and accumulating a predetermined volume of fuel, a movable member mounted in the slug pump such that movement thereof reduces the volume of said chamber to expel the fuel therein accumulated and thereby momentarily increase the rate of flow in said outLet segment, a pressurizing valve operatively connected to said main fuel supply line for regulating the pressure therein and operatively connected said outlet segment, means fluidly interconnecting said chamber and said valve, and means to prevent a flow of fuel in said inlet segment during expulsion of said fuel from said chamber.
Claim 12
Dependent Claim
200 words
In a fuel control system, a main fuel supply line, a boost pump for supplying fuel to the inlet of the main fuel supply line, a main fuel pump operatively connected to said main fuel supply line for producing a fuel flow therein, a starting circuit having an inlet segment and an outlet segment for delivering a starting fuel flow, said inlet segment being connected to said main fuel supply line intermediate said boost pump and said main fuel pump for receiving fuel therefrom, a slug pump having a chamber therein, said chamber being operatively connected to said starting circuit for receiving flow from said inlet segment and accumulating a predetermined volume of fuel, a movable member mounted in the slug pump such that movement thereof reduces the volume of said chamber to expel the fuel therein accumulated and thereby momentarily increase the rate of flow in said outLet segment, a pressurizing valve operatively connected to said main fuel supply line for regulating the pressure therein and operatively connected said outlet segment, means fluidly interconnecting said chamber and said valve, and means to prevent a flow of fuel in said inlet segment during expulsion of said fuel from said chamber.
Claim 13
Dependent Claim
63 words
The combination, as defined in claim 9, in which said pressurizing valve comprises an outlet port connected to said outlet segment, said outlet port being in fluid communication with said interconnecting means, and means responsive to a sufficient pressure in said main fuel supply line to prevent fluid communication between said interconnecting means and said outlet port and thereby close said starting circuit.
Claim 14
Dependent Claim
38 words
The combination of claims 10, in which said pressure-responsive means includes a housing, a piston slideably mounted in the housing for axial movement therein and a helical compression spring operatively connected to said piston for biasing said piston.
Claim 15
Dependent Claim
54 words
The combination of claim 11, in which a member is slideably mounted for axial movement in said housing, another helical compression spring is operatively connected to said member for biasing said member, and a projection is integral with said piston, said projection being adapted to contact said member during axial movement of said piston.
Claim 16
Dependent Claim
33 words
The combination of claim 12, in which said piston has a passage passing therethrough and communicating with a face of said piston to fluidly interconnect two segments of said main fuel supply line.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |