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    • 31. 发明公开
    • Gas turbine engine fuel system with ecology valve
    • Gasturbinentriebwerks- Brennstoffsystem mitÖkoventil
    • EP2778372A2
    • 2014-09-17
    • EP14159598.3
    • 2014-03-13
    • PRATT & WHITNEY CANADA CORP.
    • Belleville, Francois
    • F02C7/232
    • F02C7/232F01D21/00F02C7/228F05D2260/602
    • A gas turbine engine fuel system (20) has an ecology valve (52) for withdrawing residual fuel from primary and secondary fuel manifolds (22, 24) upon engine shut-down. The ecology valve (52) has primary and secondary reservoirs (66, 72) respectively connected in fluid flow communication with the primary and secondary fuel manifolds (22, 24) and a reciprocating piston (54) movable from a retracted position when engine start-up is initiated to an extended position under normal engine running conditions. The movement of the reciprocating piston (54) between the retracted and extended positions controls the flow of fuel from and to the primary and secondary reservoirs (66, 72). A cross-bleed passage (90) is defined in the reciprocating piston (54) and connects the primary and secondary reservoirs (66, 72) in fluid flow communication only when the piston (54) is in its extended position.
    • 燃气涡轮发动机燃料系统(20)具有生态阀(52),用于在发动机关闭时从主燃料歧管(22)和第二燃料歧管(22,24)中抽出残余燃料。 生态阀(52)具有分别连接到主燃料歧管(22,24)和主燃料歧管(22,24)的流体流动连通的主要和次要储存器(66,72)以及当发动机起动时可从缩回位置移动的往复活塞(54) 在正常的发动机运行条件下启动到延伸位置。 往复活塞(54)在缩回位置和伸展位置之间的移动控制来自主要和辅助储存器(66,72)的燃料流。 交叉排放通道(90)限定在往复活塞(54)中,并且仅当活塞(54)处于其延伸位置时,才将流体流动连通并连接主储液器(66,72)。