１）根据机井井管内径选择水泵的最大外径。要求泵的最大外径比井管内径小２５ｍｍ～３０ｍｍ。如果井管稍有弯曲，则两者的直径差应再稍大些。总的原则是：不仅要考虑泵能装入井管内，还要考虑泵装入后，泵在井下的部分不接触井管内壁，以防水泵在运行中产生振动，损坏井... 1) Select the maximum outer diameter of the pump according to the inner diameter of the shaft of the machine shaft. Requires the maximum diameter of the pump tube diameter smaller than 25mm ~ 30mm. If the well tube is slightly curved, then the diameter difference between the two should be slightly larger. The general principle is: not only to consider the pump can be loaded into the well tube, but also consider the pump is loaded, the pump part of the well does not touch the well wall to prevent water pump vibration during operation, damage to the well ...