US3650643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pump and delivery system
Assignee: Colt Industries Operating Corp
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Filing: 1970-04-30
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Granted: 1972-03-21
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Expires: 1990-04-30
Abstract
Abstract A fuel pump and delivery system for gas turbine engines is disclosed having a plurality of interrelated pumping circuits to meet the engine fuel requirements over the entire range of engine operation. The system has three distinct but interrelated circuits for (1) start up and low-speed operating requirements, (2) normal operating requirements above engine idle speed, and (3) high altitude cruise requirements. A positive displacement gear pump functions in the low speed and start up circuit to provide the necessary dry lift and high pressure, and after the start-up requirements have been met this part of the displacement gear pump is unloaded to terminate its pumping action, but the gear train is employed to drive selectively operative centrifugal pumps of different capacities suitable to meet the engine fuel requirements for either normal operations or for high altitude cruise.
Inventors
- 👤 Charles W Grennan
- 👤 Richard J Hearn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/02; F02; F02C; F02C7/00; F02C7/22; F02C7/236; F04C14/06; F04C15/00; F04C15/0003; F04C15/0007; F04C15/0019; F04D; F04D13/00; F04D13/12; F04D15/00; F04D15/0072
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
262 words
A controllable gear pump comprising: a housing defining a pumping cavity with a fluid inlet port and a fluid discharge port; a pair of intermeshing gears rotatably mounted within the cavity between the inlet port and the discharge port; adjustable sealing block means mounted within the cavity and interposed between the pair of gears and the discharge port, the sealing block means having sealing surfaces confronting the peripheries of the gear teeth at the discharge side of the gears and a discharging channel leading from the intermeshing region of the gears to the discharge port, the block means and the sealing surfaces being adjustable toward and away from the peripheries of the gears; lateral sealing means including a pair of opposed sealing plates interposed in the cavity between the lateral sides of the gears and said housing; actuating means connected to the sealing block means for adjusting the position of the sealing block means and the sealing surfaces toward and away from the peripheries of the gears, said actuating means including a fluid operated piston having opposed first and second sides; fluid communication means between one side of said piston and said discharging channel, said fluid communication means including a fluid flow restriction means extending through one of said sealing plates for fluid communication with said discharging channel; fluid conduit means for selectively connecting said one side of said pistoN to a low pressure to unload said piston; and fluid conduit means for selectively connecting the second side of said piston to a desired pressure source to unload said sealing block means.
Claim 2
Dependent Claim
262 words
A controllable gear pump comprising: a housing defining a pumping cavity with a fluid inlet port and a fluid discharge port; a pair of intermeshing gears rotatably mounted within the cavity between the inlet port and the discharge port; adjustable sealing block means mounted within the cavity and interposed between the pair of gears and the discharge port, the sealing block means having sealing surfaces confronting the peripheries of the gear teeth at the discharge side of the gears and a discharging channel leading from the intermeshing region of the gears to the discharge port, the block means and the sealing surfaces being adjustable toward and away from the peripheries of the gears; lateral sealing means including a pair of opposed sealing plates interposed in the cavity between the lateral sides of the gears and said housing; actuating means connected to the sealing block means for adjusting the position of the sealing block means and the sealing surfaces toward and away from the peripheries of the gears, said actuating means including a fluid operated piston having opposed first and second sides; fluid communication means between one side of said piston and said discharging channel, said fluid communication means including a fluid flow restriction means extending through one of said sealing plates for fluid communication with said discharging channel; fluid conduit means for selectively connecting said one side of said pistoN to a low pressure to unload said piston; and fluid conduit means for selectively connecting the second side of said piston to a desired pressure source to unload said sealing block means.
Claim 3
Dependent Claim
26 words
The controllable gear pump of claim 1 wherein: the lateral sealing means includes means for pressure loading the plates confronting the lateral sides of the gears.
Claim 4
Dependent Claim
36 words
The controllable gear pump of claim 2 wherein: the adjustable sealing block means includes a sealing block having the sealing surfaces; and the sideplates confront both the lateral sides of the gears and the sealing block.
Claim 5
Dependent Claim
265 words
A controllable gear pump comprising: a housing defining a pumping cavity with a fluid inlet port and a fluid discharge port; a pair of intermeshing gears of equal width rotatably mounted within the cavity between the inlet port and the discharge port; adjustable sealing block means mounted within the cavity and interposed between the pair of gears and the discharge port, the sealing block means having sealing surfaces confronting the peripheries of the gear teeth at the discharge side of the gears and a pair of opposed side surfaces spaced apart an amount equal to the width of said gears, the block means and the sealing surfaces being adjustable toward and away from the peripheries of the gears; a discharging channel in said sealing block leading from the intermeshing region of the gears to the discharge port, said discharging channel extending between the opposite side surfaces of said sealing block; lateral sealing means including a pair of opposed sealing plates interposed in the cavity between the lateral sides of the gears and the discharge port; and a through passageway in one of said sideplates for the flow of fluid from the discharge side of said gears; and piston means for urging said one sideplate against said sealing block and said gears, said piston means including one piston having a neck portion with a passageway therethrough extending into said through passageway in said one plate; said discharging channel, said passageway in the neck of said one piston and said discharge port all being substantially coaxial to define a discharge path through the side of said housing.
Claim 6
Dependent Claim
265 words
A controllable gear pump comprising: a housing defining a pumping cavity with a fluid inlet port and a fluid discharge port; a pair of intermeshing gears of equal width rotatably mounted within the cavity between the inlet port and the discharge port; adjustable sealing block means mounted within the cavity and interposed between the pair of gears and the discharge port, the sealing block means having sealing surfaces confronting the peripheries of the gear teeth at the discharge side of the gears and a pair of opposed side surfaces spaced apart an amount equal to the width of said gears, the block means and the sealing surfaces being adjustable toward and away from the peripheries of the gears; a discharging channel in said sealing block leading from the intermeshing region of the gears to the discharge port, said discharging channel extending between the opposite side surfaces of said sealing block; lateral sealing means including a pair of opposed sealing plates interposed in the cavity between the lateral sides of the gears and the discharge port; and a through passageway in one of said sideplates for the flow of fluid from the discharge side of said gears; and piston means for urging said one sideplate against said sealing block and said gears, said piston means including one piston having a neck portion with a passageway therethrough extending into said through passageway in said one plate; said discharging channel, said passageway in the neck of said one piston and said discharge port all being substantially coaxial to define a discharge path through the side of said housing.
Claim 7
Dependent Claim
26 words
The controllable gear pump of claim 4 wherein: the piston means are urged against said one sideplate in response to the discharge pressure of the pump.
Claim 8
Dependent Claim
18 words
The controllable gear pump of claim 5 including: spring means interposed between said housing and the piston means.
Claim 9
Dependent Claim
51 words
The controllable gear pump of claim 6 wherein: said piston means includes a plurality of pistons; and wherein the housing includes a plurality of cylindrical cavities and defines fluid conduits interconnecting each cavity with the fluid discharge port; and the plurality of pistons are mounted respectively in the plurality of cavities.
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |