Submersible pump failure and maintenance Submersible pump is composed of asynchronous motor and pump, widely used in agricultural irrigation and drainage and industrial water supply industry. A dry, oil-immersed, water-cooled, and so on. Due to the long-term dive into the water pump work, coupled with poor water quality in some areas, the poor quality of the power grid, lack of maintenance experience, so a higher failure rate, maintenance is also greater. First, the submersible pump common fault 1, 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 the pump, resulting in serious mechanical seal face wear and tear, water infiltration, wetting the motor windings 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. 2, oil leakage Submersible pump oil leakage is mainly due to severe wear and tear seal box, resulting in sealed box oil room 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. 3, after the power, the impeller does not turn on the water 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 pump to check whether the rotor bearing balls crush the bottom cause stuck rotor; if the impeller can be switched, but the impeller does not turn after power failure, the cause of the fault may be serious bearing wear, when the stator magnetism generated when the rotor sucked Can not turn. Replace the bearing assembly pump, dial impeller flexible, troubleshooting. 4, pump water weakness, small flow out of the pump, check the rotor rotation flexible, energized rotor can turn. Disassembled the pump and found that the lower end of the pump loosening between the shaft and the bearing, and the rotor down, so the rotor rotation weakness, the output power is small. Use appropriate gasket pad between the rotor and bearing, the rotor up, install the test machine, the fault can be ruled out. Second, the submersible pump maintenance precautions 1, demolition methods to be properly demolished before, to the end of the front cover and seat sewn with prickly heat marked. Because the motor assembly at the factory is quite reasonable, if not repaired as it is assembled, it may cause slight error and cause the shaft to be less flexible. Be careful to observe the degree of burnout when demolished, a preliminary analysis of the reasons for burning, pay attention to a slight sweep bore, ball rupture and other easy to see the fault. In the demolition of bad winding, pay attention to protect the core and plastic retainer. If the method is not suitable, it may cause the core up and disability, the motor may produce electromagnetic effects when energized so that the core vibration, the winding itself vibration, it is likely to cause insulation paper, wire insulation damage. Stitching method is to use diagonal pliers cut from one end, the other pliers out. 2, homemade line mode to be appropriate, the line should be properly embedded one phase, and then embedded in another phase, so that the end of the formation of three planes, the end must be tightly wrapped to prevent scratches during assembly. 3, adjust the limit screw position adjustment should be carefully and carefully, so that the rotor can rotate freely, and no-load current minimum. Then tighten the lock nut. 4, waterproof joints to deal with the joints to peel off the jacket and insulation, and remove the copper surface paint, oxide layer, twisted after the soldering. And then remove the sharp corners, burrs and soldering liquid, with a half-stack of polyethylene tape 6 layers, and then use polyester tape half-stack 2 layers, as a mechanical protective layer. 5, ready to test before the power test motor cavity must be filled with water or rust buffer, the role is to cool the winding and lubrication of bearings, or motor windings will soon be burned. Do not drain the motor within the winter water to prevent cracking of the pump body. 6, submersible pump to use the regular manufacturer of QYW polyethylene insulated nylon sheath waterproof solenoid pump should be suspended vertically into the water to use, the maximum tilt angle should not exceed 15 °, lie on the use of will greatly shorten the use of electric pump life This article Keywords: Submersible pumps