IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0626179
(2000-07-27)
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발명자
/ 주소 |
- Kumar Abhay
- Futa
- Jr. Paul W.
- Fisher Steven F.
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출원인 / 주소 |
- Honeywell International Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
10 인용 특허 :
2 |
초록
▼
An unbalance compensated bypass valve (14, 21, 23) for a gas turbine engine fuel supply system is responsive to the fuel pressure differential across a fuel metering valve (15) to open and close a bypass orifice (37, 39, 41; 89, 91, 93; 99, 101, 103). The bypass valve (14, 21, 23) selectively suppli
An unbalance compensated bypass valve (14, 21, 23) for a gas turbine engine fuel supply system is responsive to the fuel pressure differential across a fuel metering valve (15) to open and close a bypass orifice (37, 39, 41; 89, 91, 93; 99, 101, 103). The bypass valve (14, 21, 23) selectively supplies high fuel pressure to a compensating cavity (45, 95, 120) providing a counterbalancing force against an annular area (47, 97, 124) of the bypass valve piston (34, 81, 83, 111, 112) to compensate for increased restorative forces of a helical reference spring (57, 112, 125) as that spring is collapsed as well as to compensate for other unbalance conditions within the valve (14, 21, 23). The compensating cavity may include a variable orifice inlet (37, 39, 41), (99, 101, 103), or (89, 91, 93) and a variable orifice outlet (105, 107, 109) or the inlet orifice may be variable while the outlet orifice (43, 96, 99) is fixed. The piston (34) or housing (100) may include additional sidewall openings (69, 70, 71) or (92, 94) which function during a "shut-off" condition to divert all fuel flow from the metering valve (15) inlet back to a fuel pump (13) inlet. The piston (34) may also include further sidewall openings (73, 75) which provide a controlled fuel leakage from a bypass valve inlet (25) to the bypass valve pressure sensing port (29).
대표청구항
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[ What is claimed is:] [1.]1. A fuel control system for supplying fuel with low fuel pressure from a fuel supply to an inlet of a fuel pump and fuel with a high fuel pressure from an outlet of the fuel pump to an engine, comprising a variable orifice metering valve having an inlet for receiving high
[ What is claimed is:] [1.]1. A fuel control system for supplying fuel with low fuel pressure from a fuel supply to an inlet of a fuel pump and fuel with a high fuel pressure from an outlet of the fuel pump to an engine, comprising a variable orifice metering valve having an inlet for receiving high pressure fuel from the fuel pump outlet and an outlet for supplying fuel to the engine at a pressure intermediate the low and high fuel pressures and a fuel bypass valve for diverting selectively fuel from the outlet of the fuel pump back to the inlet of the fuel pump to maintain substantially constant a fuel pressure differential between the inlet and the outlet of the metering valve, the fuel bypass valve comprising a variable flow bypass path including a movable member for varying the bypass flow, the movable member being urged in a direction to increase the bypass flow by high fuel pressure from the metering valve inlet and urged in a direction to reduce the bypass flow by intermediate fuel pressure from the metering valve outlet, the bypass flow path including a pressure responsive compensating cavity having a variable orifice inlet and a variable orifice outlet, the compensating cavity providing a variable additional force urging the member in a direction to increase the bypass flow.
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