1. Submersible pump oil leakage
The oil leakage of the submersible pump is mainly caused by severe wear and tear of the sealing box, resulting in oil leakage in the oil chamber of the sealing box or poor sealing at the outlet box.
When the oil chamber of the sealing box leaks oil, oil stains can be seen at the inlet joint. There is an oil filling hole at the inlet joint, unscrew the screw, and observe whether the oil chamber is filled with water. If the oil chamber is filled with water, it indicates poor sealing. The sealing box should be replaced to prevent severe water ingress into the motor. If there is oil leakage at the root of the submersible pump cable, it belongs to oil leakage inside the motor. Generally, it is caused by poor sealing of the sealant plug or improper use of leads after rewinding the motor; Some are caused by the rupture of the water pump wiring board. After inspection and confirmation, replace with qualified new products. And measure the insulation degree of the motor. If the insulation is poor, it should be dealt with in a timely manner, and the oil inside the motor should be replaced with new ones.
2. Leakage of submersible pump
Leakage is the most common fault of submersible pumps and one of the most dangerous factors that endanger personal safety. The fault phenomenon is that when the switch is closed, the leakage protector in the transformer distribution room trips (without a leakage protector, it can be quite dangerous and cause the motor to burn out). This is mainly due to water entering the pump body of the submersible pump, causing a decrease in the insulation resistance of the motor winding of the submersible pump, leading to the action of the protector. At this time, use the R value of a shaking table or multimeter × Measure the leakage resistance of the motor winding to the outer shell at 10k Ω gear. Long term use of the water pump causes severe wear on the mechanical seal end face, causing water to seep in and wet the motor winding, resulting in leakage. The dismantled submersible pump motor can be placed in the drying room or dried with 100-200W incandescent bulbs; Measure the insulation resistance to infinity, then replace the mechanical seal and install the pump before putting it into use.
3. The impeller speed of the submersible pump is low, and the head cannot be reached
Many customers find that the actual head of the newly purchased submersible pump does not meet the standard head when they start using it, and measurements show that the speed is also low. This situation may be due to incorrect wiring, it is recommended to replace the live wire strip. It is also possible that the submersible pump is inferior and the head cannot be reached.
4. After the submersible pump is powered on, the impeller does not rotate
After being powered on, the water pump makes a buzzing sound and the impeller does not rotate. Cut off the power and move the impeller at the water inlet. If it cannot be moved, it indicates that the rotor is stuck. The water pump can be disassembled for inspection to see if the bearing ball at the lower end of the rotor is broken, causing the rotor to jam; If the impeller can be moved, but it does not rotate after being powered on, the cause of the malfunction may be severe wear of the bearings. When powered on, the magnetic field generated by the stator sucks the rotor and prevents it from rotating. Replace the bearings and reassemble the water pump, move the impeller flexibly, and troubleshoot.
5. The submersible pump has weak water output and low flow rate
Take out the water pump and check that the rotor rotates flexibly and can rotate when powered on. Upon disassembling the water pump for inspection, it was found that there was looseness between the lower shaft and bearing of the water pump, and the rotor moved downwards, resulting in weak rotation of the rotor and low output power. Use appropriate washers to pad between the rotor and bearings, move the rotor upwards, install and test the machine, and the fault can be eliminated.