Motor pump unit for lift pump, has coil and magnet to move shaft between upper and lower positions, and detector to provide signal if delivery pipe pressure exceeds threshold value to control coil and magnet

摘要

The unit has a motor integrated with a vertical shaft (5) and pump with a hydraulic wheel integrated with the shaft. An electromagnetic coil (13) and an annular magnet (14) move the shaft between an upper position and a lower position. A pressure detector generates a signal when the pressure in a delivery pipe exceeds a threshold value to control the coil and magnet for regulating the shaft movement.