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    • 2. 发明授权
    • High-pressure high-temperature coal slurry centrifugal pump and let-down
turbine
    • 高压高温煤浆离心泵和排风机
    • US4893986A
    • 1990-01-16
    • US783045
    • 1985-09-30
    • Fritz C. CatterfeldGeorge S. Wong
    • Fritz C. CatterfeldGeorge S. Wong
    • F04D1/10F04D7/04F04D29/44
    • F04D29/448F04D1/10F04D29/4273F04D29/428F04D7/04
    • A two-stage, high-pressure centrifugal pump comprises a pump housing and at least one pair of external inlets and outlets for charging and discharging each stage of the pump. The inlets and outlets are located through the periphery of the pump for allowing on-line maintenance. Prerotator vanes are located along the interior wall of the pump housing and convey a fluid from the external inlet to the impeller while reducing the inlet relative velocity at the impeller inlet and primarily at the impeller inlet tip. A pair of face-to-face impellers located along the pump shaft are designed to increase the fluid velocity while transferring fluid to a vaneless radial diffuser. The diffuser then decreases fluid velocity and increases fluid pressure due to increasing diffuser volume. From the diffuser the fluid is conveyed into a fold-over volute which is likewise designed to increase fluid pressure while additionally eliminating flow patterns which would increase losses within the system. A replaceable cutwater is interposed between the diffuser and the volute to channel fluid into the volute and, finally, a hydrostatic slurry seal is coaxially located along the pump shaft so as to prevent leakage of the primary fluid from the high-pressure pump interior to the atmospheric pump exterior. Upon reversing the fluid flow, the pump discharge pipe or external outlet becomes turbine intake 102 and pump inlet volute 14 becomes the turbine radial discharge scroll 112. Discharge scroll 112 is then connected with cross-over duct 114 and leads via a second turbine intake 102 into the second stage of the let-down turbine 100.
    • 两级高压离心泵包括泵壳体和至少一对外部入口和出口,用于对泵的每个级进行充气和排出。 入口和出口位于泵的外围,用于允许在线维护。 预调节叶片沿着泵壳体的内壁定位并且将流体从外部入口传送到叶轮,同时减小叶轮入口处的入口相对速度,并且主要在叶轮入口端处。 沿着泵轴设置的一对面对面叶轮被设计成在将流体传送到无叶径向扩散器的同时增加流体速度。 扩散器随着扩散器体积的增加而降低流体速度并增加流体压力。 从扩散器将流体输送到折叠式蜗壳中,其同样设计成增加流体压力,同时另外消除将增加系统内的损失的流动模式。 在扩散器和蜗壳之间插入可更换的切割水,以将流体引导到蜗壳中,最后,静压浆料密封件沿着泵轴同轴定位,以防止主流体从高压泵内部泄漏到 大气泵外部。 在反向流体流动时,泵排出管或外部出口成为涡轮进气口102,泵入口蜗壳14变为涡轮径向排放涡盘112.然后,排出涡旋件112与交叉管道114连接,经由第二涡轮进气口102 进入降压式涡轮机100的第二级。