US3909159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable displacement pump for gas turbine fuel management system
Assignee: Garrett Corp
•
Filing: 1973-03-05
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Granted: 1975-09-30
•
Expires: 1993-03-05
Abstract
Abstract This variable displacement pump for a gas turbine fuel management system has a movable differential diaphragm assembly, one diaphragm of which pumps the fuel while another (the actuator diaphragm) effects movement of the assembly in response to forces applied thereto mechanically in response to engine operation, resiliently by spring force, and controlled fluid pressure. The displacement is varied to change the speed of the gas turbine controlled thereby by changing the pressure applied to the actuator diaphragm either through a flyweight governor driven by the gas turbine or such governor in combination with a throttle. In addition, the turbine speed may be varied by an electrically actuated valve disposed in the fuel line between the pump and the point of use. For starting purposes, a resilient force through the medium of a spring is applied to the actuator diaphragm. A combined spring and pressure actuated diaphragm is employed to maintain pressure on the fuel between the pump outlet and point of use, during the induction of fuel to the pump. In the event the gas turbine is provided with a free, or power turbine, a second flyweight governor could be utilized to change or limit the pressure applied to the actuator diaphragm and thus prevent undesired over-speed of the engine.
Inventors
- 👤 Harvey B Jansen
- 👤 Milton R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:35
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
125 words
A variable displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. means for varying the fluid pressure applied to said lastnamed means to govern the rate of fluid discharge by said element; and e. throttle means for manually adjusting the effectivity of said fluid pressure varying means.
Claim 2
Dependent Claim
125 words
A variable displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. means for varying the fluid pressure applied to said lastnamed means to govern the rate of fluid discharge by said element; and e. throttle means for manually adjusting the effectivity of said fluid pressure varying means.
Claim 3
Dependent Claim
28 words
The variable displacement pump of claim 1 in which said element has a parameter bearing a predetermined relation to the volume of fuel discharged per cycle of movement.
Claim 4
Dependent Claim
15 words
The variable displacement pump of claim 1 in which said element has a flexible diaphragm.
Claim 5
Dependent Claim
21 words
The variable displacement pump of claim 1 in which the combined resilient and fluid pressure responsive means has a flexible diaphragm.
Claim 6
Dependent Claim
35 words
The variable displacement pump of claim 3 in which the combined resilient and fluid pressure responsive means has a flexible diaphragm bearing a predetermined area ratio to that of said element and rigidly connected thereto.
Claim 7
Dependent Claim
38 words
The variable displacement pump of claim 5 in which the area ratio of the flexible diaphragm of said combined resilient and fluid pressure responsive means relative to the flexible diaphragm of said element is substantially two to one.
Claim 8
Dependent Claim
23 words
The variable displacement pump of claim 1 in which the power driven means for mechanically moving said element includes a cam and lever.
Claim 9
Dependent Claim
29 words
The variable displacement pump of claim 1 in which the means for varying the fluid pressure applied to said combined resilient and fluid pressure responsive means is speed responsive.
Claim 10
Dependent Claim
39 words
The variable displacement pump of claim 1 in which the means for varying the fluid pressure applied to said combined resilient and fluid pressure responsive means is responsive to the speed of the gas turbine equipped with the pump.
Claim 11
Dependent Claim
31 words
The variable displacement pump of claim 1 in which the combined resilient and fluid pressure responsive means has a diaphragm and a spring urging said element in a fuel discharging direction.
Claim 12
Dependent Claim
36 words
The variable displacement pump of claim 10 in which said diaphragm is exposed to fluid pressure from the compressor of the gas turbine equipped with the pump to move said element in a fuel discharging direction.
Claim 13
Dependent Claim
23 words
The variable displacement pump of claim 11 in which the means for varying the fluid pressure applied to the diaphragm is speed responsive.
Claim 14
Dependent Claim
29 words
The variable displacement pump of claim 12 in which the speed responsive fluid pressure varying means is responsive to the speed of the gas turbine equipped with the pump.
Claim 15
Dependent Claim
145 words
A variable displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to Draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. means for varying the fluid pressure applied to said last-named means to govern the rate of fluid discharge by said element said means comprising an orifice and a pivoted lever disposed for movement to control the effective size of such orifice; and e. throttle means for manually adjusting the effectivity of said fluid pressure varying means.
Claim 16
Dependent Claim
145 words
A variable displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to Draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. means for varying the fluid pressure applied to said last-named means to govern the rate of fluid discharge by said element said means comprising an orifice and a pivoted lever disposed for movement to control the effective size of such orifice; and e. throttle means for manually adjusting the effectivity of said fluid pressure varying means.
Claim 17
Dependent Claim
38 words
The variable displacement pump of claim 14 in which a flyweight type governor adapted to be driven by and responsive to the speed of the gas turbine equipped with the pump is disposed to actuate said pivoted lever.
Claim 18
Dependent Claim
54 words
The variable displacement pump of claim 15 in which an increase in turbine speed tends to cause said governor to move said pivoted lever in a direction to increase the size of said orifice and movement of said throttle means in a predetermined direction tends to oppose movement of said lever by said governor.
Claim 19
Dependent Claim
36 words
The variable displacement pump of claim 16 in which said throttle means has a member adapted to apply a yieldable load to said pivoted lever to tend to move the same in an orifice closing direction.
Claim 20
Dependent Claim
46 words
The variable displacement pump of claim 1 in which means are connected with the pump outlet to maintain pressure on the fuel between the outlet and point of use when said element is moved in the direction to draw fuel from the supply into the pump.
Claim 21
Dependent Claim
31 words
The variable displacement pump of claim 18 in which the means for maintaining pressure on the fuel between the outlet and point of use has a diaphragm exposed to spring force.
Claim 22
Dependent Claim
35 words
The variable displacement pump of claim 19 in which the diaphragm for maintaining pressure on the fuel between the outlet and point of use is also exposed on the spring pressed side to fluid pressure.
Claim 23
Dependent Claim
179 words
A variable displacement fuel pump for a gas turbine engine comprising: a. housing means having a fuel inlet opening and a fuel discharge opening; b. first movable wall means forming a first chamber in said housing means communicating with said inlet and discharge openings; c. second movable wall means forming a second chamber in said housing; d. rod means for connecting said wall means for simultaneous movement; e. driving means operably connected to said rod means for moving said rod means in a direction to cause said first movable wall means to draw fuel into said first chamber; f. a source of fluid pressure connected to said second chamber such that an increase in said pressure causes said first wall means to discharge fuel from said first chamber; g. resilient means connected to said rod means urging said first wall means in a direction to discharge fuel from said first chamber; h. control means connected between said fluid source and said second chamber for controlling the pressure in said second chamber; i. throttle means for actuating said control means.
Claim 24
Dependent Claim
179 words
A variable displacement fuel pump for a gas turbine engine comprising: a. housing means having a fuel inlet opening and a fuel discharge opening; b. first movable wall means forming a first chamber in said housing means communicating with said inlet and discharge openings; c. second movable wall means forming a second chamber in said housing; d. rod means for connecting said wall means for simultaneous movement; e. driving means operably connected to said rod means for moving said rod means in a direction to cause said first movable wall means to draw fuel into said first chamber; f. a source of fluid pressure connected to said second chamber such that an increase in said pressure causes said first wall means to discharge fuel from said first chamber; g. resilient means connected to said rod means urging said first wall means in a direction to discharge fuel from said first chamber; h. control means connected between said fluid source and said second chamber for controlling the pressure in said second chamber; i. throttle means for actuating said control means.
Claim 25
Dependent Claim
38 words
The variable displacement pump of claim 21 in which the control means has an orifice for varying the pressure in said second chamber and a pivoted lever disposed for movement to control the effective size of said orifice.
Claim 26
Dependent Claim
38 words
The variable displacement pump of claim 22 in which a flyweight type governor adapted to be driven by and responsive to the speed of a gas turbine equipped with the pump is disposed to actuate the pivoted lever.
Claim 27
Dependent Claim
54 words
The variable displacement pump of claim 23 in which an increase in turbine speed tends to cause said governor to move said pivoted lever in a direction to increase the size of said orifice and movement of said throttle means in a predetermined direction tends to oppose movement of said lever by said governor.
Claim 28
Dependent Claim
35 words
The variable displacement pump of claim 24 in which said throttle means has member adapted to apply a yieldable load to said pivoted lever to tend to move the same in an orifice closing direction.
Claim 29
Dependent Claim
143 words
A variaBle displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. a source of pressurized fluid; e. conduit means connecting said source of pressurized fluid with said combined resilient and fluid pressure responsive means; f. control means in said conduit means for varying the fluid pressure applied to said combined resilient and fluid pressure responsive means; and g. throttle means for adjusting said control means.
Claim 30
Dependent Claim
143 words
A variaBle displacement pump for a gas turbine fuel management system comprising: a. an element disposed for movement in one direction to draw fuel from a supply and in the opposite direction to discharge such fuel from the pump outlet under pressure to a point of use; b. power driven means mechanically moving said element in the said direction to draw fuel from the supply; c. combined resilient and fluid pressure responsive means moving said element in the direction to discharge the fuel to the point of use; d. a source of pressurized fluid; e. conduit means connecting said source of pressurized fluid with said combined resilient and fluid pressure responsive means; f. control means in said conduit means for varying the fluid pressure applied to said combined resilient and fluid pressure responsive means; and g. throttle means for adjusting said control means.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |