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    • 8. 发明专利
    • Pump suction pipe
    • 泵吸管
    • JP2013217346A
    • 2013-10-24
    • JP2012090626
    • 2012-04-12
    • Hitachi Ltd株式会社日立製作所
    • OKIHARA TAKASHINAGAHARA TAKAHIDETORII DAICHIKAZAMA TAKESHI
    • F04D29/60F04D13/00F04D13/16F04D29/66
    • F15D1/001E03B5/00F04B39/00F04B53/16F04D29/4273F04D29/669F04D29/688F15D1/04
    • PROBLEM TO BE SOLVED: To restrain the occurrence of cavitation and partial presence of an occurrence area in a pump impeller, by restraining a secondary flow generated in a bending part of a suction pipe of a pump.SOLUTION: A suction pipe 20 of a pump includes a suction pipe outlet part 6 connected to an impeller suction port of the pump and arranged in the vertical direction, a suction pipe inlet part 8 arranged in the horizontal direction, and a suction pipe bending part 1 for connecting the suction pipe outlet part 6 and the suction pipe inlet part 8 and changing a flow in the vertical direction from the horizontal direction. The suction pipe bending part 1 is formed in a shape of monotonously increasing a distance Ri from an inside reference point toward the downstream side from the upstream side in its longitudinal section.
    • 要解决的问题:通过抑制在泵的吸入管的弯曲部分中产生的二次流来限制空气发生和泵叶轮中的发生区域的部分存在。解决方案:泵的吸入管20 包括连接到泵的叶轮吸入口并沿垂直方向布置的吸入管出口部分6,沿水平方向布置的吸入管入口部分8和用于连接吸入管出口部分6的吸入管弯曲部分1 和吸入管入口部8,并且从水平方向改变垂直方向的流动。 吸入管弯曲部1形成为从内侧基准点朝向其纵向截面的上游侧的下游侧单调增加距离Ri的形状。