Submersible pump often encountered in the use of oil leakage, leakage, tripping, head up, the impeller does not turn, the flow is small, low speed and other issues, the following detailed analysis of these common problems: 1, low speed impeller, Lifts not reach Many customers just bought the submersible pump started to use, found that the actual lift can not reach the standard lift, the measurement also found that speed is low. This situation may be incorrect wiring, it is recommended fire lines to change it. There may be submersible pump is poor, lift less than. 2, submersible pump water weakness, flow out of the submersible pump, check the rotor rotation flexible, energized rotor can turn. Disassembled the pump and found that the lower end of the submersible pump was loosened between the shaft and the bearing, and the rotor moved downward, so the rotor was weak and the output power was small. Use appropriate gasket pad between the rotor and bearing, the rotor up, install the test machine, the fault can be ruled out. 3, after power, the impeller does not turn on the submersible pump buzz hum, impeller does not turn. Turn off the power, dial the impeller at the inlet, if the dial does not move, the rotor is stuck. Detachable submersible pump to check whether the rotor bearing balls crushed to cause stuck rotor; if the impeller can be switched, but the impeller does not turn after power failure may be due to bearing serious wear and tear, And can not rotate. Replace the bearing assembly pump, dial impeller flexible, troubleshooting. 4, oil leakage Submersible pump oil leakage is mainly due to severe wear and tear seal box, resulting in sealed box oil chamber leakage or outlet box at the bad seal. Seal box oil room leakage, visible in the water section at the oil stains. In the water section has a filling hole, unscrew the screws, observe the oil chamber is water. If the oil chamber into the water, it is bad seal, seal box should be replaced to prevent the oil chamber serious water infiltration into the motor. If the submersible pump cable root oil phenomenon, which belongs to the oil leakage within the motor. Generally sealed sealant sealing bad or motor rewinding leads caused by unqualified; some are caused by the breakdown of the pump wiring board. After the inspection is confirmed, the new products can be changed. And measure the degree of insulation of the motor, if the insulation is not good should be handled in time, while the motor oil for new. 5, leakage leakage is the most common submersible pump fault, but also one of the most dangerous factors endangering personal safety. Symptom When closing the knife, the earth leakage protector trips in the transformer distribution room (if there is no earth leakage protector, it will be quite dangerous and will cause the motor to burn out). This is mainly due to the submersible pump body water, resulting in submersible pump motor winding insulation resistance decreases, leading to protection action. At this point with a shaking table or multimeter R × 10kΩ block, measuring the motor winding on the shell has a certain leakage resistance. Long-term use of submersible pumps, resulting in serious mechanical seal face wear, water infiltration, wetting the motor winding to form a leakage. Submersible pump motor can be removed on the drying room, or with 100-200W incandescent light bulb drying; measured insulation resistance of infinity, and then the mechanical seal replacement, and then installed the pump can be put into use.
