一、根据井径、水质初定泵型。要求水泵的最大外径要小于井管内径２５～５０毫米。若井管歪斜 ,则泵的最大外径还应小些。总之 ,泵体部分不能紧靠井管内壁 ,以防水泵震动将井管碰坏。二、根据井的出水量 ,选定井泵的流量。深水泵的流量应等于或小于机井水位下井水深度一半时的 First, according to the caliper, the initial water quality pump. Requires the maximum diameter of the pump is less than 25 to 50 mm diameter borehole. If the well tube skew, the maximum diameter of the pump should be smaller. In short, part of the pump body can not close the well wall, to prevent the pump vibration will damage the well tube. Second, according to the well water, selected well pump flow. Deep-water pump flow should be equal to or less than half the depth of the well water level