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    • 2. 发明申请
    • Multi Stage Diffuser Pump
    • 多级扩散泵
    • US20080014082A1
    • 2008-01-17
    • US11774729
    • 2007-07-09
    • Katsutoshi KobayashiHayato ShimizuTetsuya YoshidaYoshimasa Chiba
    • Katsutoshi KobayashiHayato ShimizuTetsuya YoshidaYoshimasa Chiba
    • F01D1/04
    • F04D29/669F04D29/2216F04D29/245
    • The object of the present invention is to provide a pump structure that can reduce a hydraulic force applied to a casing of a multi stage diffuser pump, which includes multiple stages of impellers fixed to a rotary shaft rotatably supported in the casing and multiple stages of guide vane diffusers and return blade passages fixed on the casing in correspondence with the multiple stages of impellers, thereby reducing the vibrations and noises of the pump. In a multi stage diffuser pump of the type which includes multiple stages of impellers fixed to the rotary shaft and multiple stages of guide vane diffusers and return blade passages fixed on circular disks in the casing in correspondence with the multiple stages of impellers, in the impellers of the two stages of front and rear stages, which are equivalent in the form and number of blades, the phases of positions in the peripheral direction of the blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.47 pitch or more and 0.53 pitch or less. With this, a hydraulic force in the axial direction applied to the casing can be reduced and hence the vibrations and noises of the pump can be reduced.
    • 本发明的目的是提供一种泵结构,其能够降低施加到多级扩散泵的壳体的液压力,该多级扩散泵包括固定到可旋转地支撑在壳体中的旋转轴的多级叶轮和多级导向件 叶片扩散器和返回叶片通道与多级叶轮相对应地固定在壳体上,从而减少泵的振动和噪声。 在这种类型的多级扩散泵中,其包括固定到旋转轴的多级叶轮和多级导向叶片扩散器和固定在壳体中圆形圆盘上的与多级叶轮相对应的回流叶片通道,在叶轮 在叶片的形式和数量上相当于前级和后级的两级的两级中,至少一对前后级叶轮的叶片的叶片的周向位置的相位彼此偏离 减小0.47节距或0.53节距以下。 由此,能够减小施加在壳体上的轴向的液压力,能够降低泵的振动和噪音。