From the performance perspective, the type of impeller and the general efficiency closed impeller or less the same, but the type of impellerpump head curve dropped more.
从性能上讲，该型式叶轮效率高和普通闭式叶轮相差不大，但用该型式叶轮泵扬程曲线较为陡降。
2
The type of the pumpimpeller and pump and centrifugal pump with a volume effect of particles suspended in mid-stream leaf out of date, do not hit any part of the pump, it is good non-destructive.
该型叶轮的泵兼具有容积泵和离心泵的作用，悬浮性颗粒在叶片中流过时，不撞击泵内任何部位，故无损性好。
3
The artical presented Designing formulas of pump body and impeller and the-defining way of liquid storage chamber and air-liquid-isolating chamber of self priming type centrifugal pump.