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公开(公告)号：US4487548A
公开(公告)日：1984-12-11
申请号：US495987
申请日：1983-05-19
CPC分类号： F04D15/0005 , F02C7/22 , F04D29/2211
摘要： A centrifugal main fuel pump (10') for a gas turbine engine has a housing (12') in which a centrifugal impeller (16') is mounted for rotation. The centrifugal impeller includes a disc (24') which carries starting flow impeller elements (34) which are positioned in a radially outer location on the disc and also carries main flow impeller elements (26') positioned in a radially inner location on the disc. The starting flow impeller elements discharge to a starting flow collector (38) and diffuser (44) and the main flow impeller elements discharge to a separate collector (30') and diffuser (32'). The starting flow impeller elements produce adequate fuel flow at the pressure necessary for engine lightoff while the main flow impeller elements are adapted to supply engine fuel flow demand in the normal range of operation. A check valve (46) prevents starting flow from returning to the centrifugal impeller. The check valve opens to allow the main flow impeller elements to supply fuel when their discharge pressure exceeds that of the starting flow impeller elements. The addition of a starting element to the impeller results in minimal additional parasitic power loss.
摘要翻译： 用于燃气涡轮发动机的离心式主燃料泵（10'）具有壳体（12'），其中安装有用于旋转的离心式叶轮（16'）。 离心式叶轮包括一个托盘（24'），该盘（24'）承载起始流动叶轮元件（34），该元件位于盘的径向外部位置，并且还承载位于盘的径向内部位置的主流动叶轮元件（26'） 。 启动流动叶轮元件排放到起动集流器（38）和扩散器（44），并且主流体叶轮元件排放到单独的收集器（30'）和扩散器（32'）。 起动流动叶轮元件在发动机熄灯所需的压力下产生足够的燃料流量，而主流量叶轮元件适于在正常操作范围内提供发动机燃料流量需求。 止回阀（46）防止返回到离心式叶轮的启动流。 止回阀打开以允许主流量叶轮元件在其排出压力超过起动流动叶轮元件的排出压力时供应燃料。 将启动元件添加到叶轮将导致最小的额外的寄生功率损失。
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公开(公告)号：US5020315A
公开(公告)日：1991-06-04
申请号：US390938
申请日：1989-08-08
IPC分类号： F02C9/26
CPC分类号： F02C9/263
摘要： A floating piston (54) has a valved (86) vent opening (88), with the vent opening closing (92) on movement of the piston. The piston is spring loaded (56, 58) to vent air, but seal fuel. Modulation of pressure in pressure resisting chamber (48) between pump discharge and lower pressures, provides control of the valve. Pressure difference (96, 62) and valve position (36) measurements provide flow measurement data.
摘要翻译： 浮动活塞（54）具有阀（86）通气口（88），在活塞运动时通气口关闭（92）。 活塞是弹簧加载（56,58）以排出空气，但密封燃料。 在泵排出口和较低压力之间调节压力室（48）中的压力，提供对阀门的控制。 压力差（96,62）和阀位（36）测量提供流量测量数据。
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公开(公告)号：US4643635A
公开(公告)日：1987-02-17
申请号：US626934
申请日：1984-07-02
摘要： A vapor core centrifugal fuel pumping system (10') has a main flow impeller (72) and a low flow impeller (81) mounted upon the front plate (74) of the main flow impeller. Both of the impellers receive flow from an inlet passage (26') which proceeds past an inlet throttling valve (114). During pumping operation of the low flow impeller, a surface (122) on the inlet throttling valve forms a labyrinth seal with the radially inner lip (120) of the front plate to reduce inlet fuel flow entering the main impeller. A first check valve (124) and a second check valve (126) respectively prevent flow from the low flow impeller from entering the main flow impeller and flow from the main impeller from entering the low flow impeller. The second check valve is associated with conduits (140, 142) to evaculate liquid adjacent the main impeller during operation of the low flow impeller to reduce windage losses. The pumping system does not engender excessive pressure or flow transients during changeover between low flow operation and normal flow operation. Also, the pumping system imparts minimal temperature rise to the fuel being pumped and is not susceptible to significant cavitation erosion.
摘要翻译： 蒸汽离心式燃料泵送系统（10'）具有安装在主流动叶轮的前板（74）上的主流动叶轮（72）和低流量叶轮（81）。 两个叶轮都从经过进口节流阀（114）的入口通道（26'）接收流。 在低流量叶轮的泵送操作期间，入口节流阀上的表面（122）与前板的径向内部唇缘（120）形成迷宫式密封，以减少进入主叶轮的入口燃料流。 第一止回阀（124）和第二止回阀（126）分别防止来自低流量叶轮的流动进入主流动叶轮并从主叶轮流入而进入低流量叶轮。 第二止回阀与导管（140,142）相关联，以在低流量叶轮的操作期间排出邻近主叶轮的液体，以减少风阻损失。 泵送系统在低流量运行和正常流量运行之间切换期间不会产生过大的压力或流动瞬变。 此外，泵送系统对被泵送的燃料施加最小的温度上升，并且不易受到明显的空化侵蚀的影响。
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公开(公告)号：US4629394A
公开(公告)日：1986-12-16
申请号：US516848
申请日：1983-07-25
CPC分类号： F04D29/445 , F04D29/428
摘要： A centrifugal main fuel pump (10') for a gas turbine engine has a housing (18') in which a centrifugal impeller (12') is mounted for rotation. The impeller discharges flow to a collector (20') and diffuser (22'). A low flow diffuser (26) has its inlet opening positioned closely adjacent the outer periphery of the impeller. Proper design and placement of the low flow diffuser ensures that a high percentage of the fluid energy available in the high velocity flow adjacent the impeller outer periphery is recovered as pressure rise. The low flow diffuser produces adequate fuel flow at the pressure necessary for engine light-off while the first mentioned diffuser recovers a lower pressure rise but is adapted to supply higher engine fuel flow demand in the normal range of operation. A check valve (34) prevents flow from the low flow diffuser from returning to the impeller. The check valve opens to allow the first mentioned diffuser to supply fuel when its discharge pressure exceeds that of the low flow diffuser. The addition of the low flow diffuser to the centrifugal pump results in minimal additional parasitic power loss, cost and complexity.
摘要翻译： 用于燃气涡轮发动机的离心式主燃料泵（10'）具有壳体（18'），其中安装有用于旋转的离心式叶轮（12'）。 叶轮将流体排放到收集器（20'）和扩散器（22'）。 低流量扩散器（26）的入口开口紧邻叶轮的外周。 低流量扩散器的正确设计和布置确保了在靠近叶轮外周边的高速流动中可用的高百分比的流体能量随压力升高而恢复。 低流量扩散器在发动机关闭所需的压力下产生足够的燃料流量，而第一个提及的扩压器恢复较低的压力上升，但适于在正常操作范围内提供更高的发动机燃料流量需求。 止回阀（34）防止来自低流量扩散器的流量返回到叶轮。 止回阀打开以允许首先提到的扩压器当其排出压力超过低流量扩散器的排出压力时供应燃料。 将低流量扩散器添加到离心泵中导致最小的额外的寄生功率损耗，成本和复杂性。
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