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    • 7. 发明专利
    • Multistage centrifugal pump
    • 多级离心泵
    • JPS59165897A
    • 1984-09-19
    • JP3920283
    • 1983-03-11
    • Hitachi Ltd
    • YOSHIDA MASAOSATOU TETSUYAMORIOKA KINYAISHIGAKI TATSUYAYANAGISAWA SEIJISHINOZUKA HIDEKIOKAMURA TOMOYOSHI
    • F04D1/08F04D29/44
    • F04D29/445
    • PURPOSE:To improve the pump efficiency, by a method wherein, in an intermediate casing, a single water return vane is located opposite to a volute maximum opening part at a preceding stage, and said vane is extended to the maximum diameter of the casing to uniformize the flow in a passage formed with the water return vane. CONSTITUTION:A water return vane 7 is positiolned opposite to a volute maximum opening 1' at a preceding stage, and the water return vane 7 is extended to the maximum diameter of a casing and is caused to coincide with the maximum opening 1'. This produces an approximately equal flow in each of passages formed with their respective water return parts, and uniformizes loss incurred due to deviation of velocity of flow in a passage, and enables water to uniformly flow in vanes at their respective subsequent stages. Furthermore, this prevents production of wasteful flow in a peripheral direction, reduces the occurrence of loss, and improves the pump efficiency. Additionally, since an intermediate casing is prevented from production of vortex therein, even if a device is used in liquid of adverse quality, this permits prevention of the occurrence of a trouble in which the casing is corroded and worn into holes.
    • 目的:为了提高泵效率,通过一种方法,其中在中间壳体中,单个回水叶片位于与前一阶段的蜗壳最大开口部分相对的位置,并且所述叶片延伸到壳体的最大直径 使通过回水叶片形成的通道中的流动均匀化。 构成:回水叶片7与前一级的蜗壳最大开口1'相对置,并且回水叶片7延伸到壳体的最大直径并使其与最大开口1'一致。 这在每个通道中形成大致相等的流量,每个通道都由其各自的回水部件形成,并且由于通道中流动速度的偏离而导致的损失均匀化,并使得水能够在各自的后续阶段均匀地流过叶片。 此外,这防止在周向方向上产生浪费的流动,减少损失的发生,并且提高泵的效率。 此外,由于防止中间壳体产生涡流,所以即使在不良品质的液体中使用装置,也可以防止壳体被腐蚀并磨损到孔中的问题的发生。
    • 8. 发明专利
    • Mixed-flow submergible pump
    • 混合流动潜流泵
    • JPS58202395A
    • 1983-11-25
    • JP8472382
    • 1982-05-21
    • Hitachi Ltd
    • TANAKA TEIJINAKAWA YASUMASA
    • F04D13/08F04D1/08F04D29/44F04D29/68
    • F04D29/445
    • PURPOSE:To reduce the undesirable influence of closing of a flow passage by a cable groove, by setting a cable groove for power source so as to bite into a flow passage on the concaved surface outer wall side of a vane at the max. diameter part of a guide vane and forming said guide vane type flow passage to be flattened in the direction of the three-dimensional curve. CONSTITUTION:On the outer wall 11a of a guide vane 6, a groove 9 for motor power cable 10 is formed in the direction of pump axis on the part corresponding to the outer wall part B of a vane concaved surface at the max. diameter part 12 of the flow passage of the guide vane 6. Therefore, the section of the flow passage is formed flattened in the direction of the three-dimensional curve, as shown in the figure, at the inlet part of the guide vane 6 where the three- dimensional curve is sharp, and thus the secondary stream is suppressed, and the stream on the inner wall A side of a vane convex wall which tends to be exfoliated from the meridian surface flow passage is restrained towards inner- wall side, and generation of exfoliation is delayed. Therefore, the undesirable influence of closing the flow passage 6 of the guide vane 6 due to the cable groove 9 can be utilized for the control of the guide vane 6 inside flow inversely.
    • 目的:为了减少由电缆槽堵塞流路的不期望的影响,通过设置用于电源的电缆槽,以最大限度地咬入叶片的凹面外壁侧的流路。 导向叶片的直径部分,并且在三维曲线的方向上形成所述导叶式流路,使其平坦化。 构成:在导向叶片6的外壁11a上,在最大角度的叶片凹面的与外壁部B对应的部分上,在泵轴方向上形成有马达动力线缆10的槽9。 导向叶片6的流路的直径部分12.因此,如图所示,流路的截面在三维曲线的方向上被平坦化,在导向叶片6的入口部分处 三维曲线是尖锐的,因此二次流被抑制,倾向于从子午线表面流动通道剥离的叶片凸壁的内壁A侧的流被限制到内壁侧,并且 一段时间的剥落延迟。 因此,由于电缆槽9而导致导向叶片6的流路6的闭合的不良影响可以用于逆流内侧的导向叶片6的控制。