The most common fault scene in the use of the air cooler is the occurrence of non-refrigeration, that is, the failure of the internal pump of the equipment. Below we will analyze some common faults and maintenance methods of the submersible pump.

Submersible pumps often encounter problems such as oil leakage, leakage, tripping, tripping, impeller rotation, low flow, low speed, etc. In the following, detailed analysis of these common faults is carried out:

1, the impeller speed is low, the lift can not reach

Many customers found that the actual head was not up to the standard head when they started using the submersible pump that was just bought. The measurement found that the speed was also low. This situation may be incorrect wiring, it is recommended to change the fire line. It is also possible that the submersible pump is inferior and the lift is not reached.

2, submersible pump water supply is weak, small flow

Take out the submersible pump and check that the rotor is flexible and the rotor can be turned on. When the pump was disassembled, it was found that the lower end of the submersible pump was loose between the shaft and the bearing, and the rotor was moved downward, so the rotor was weak and the output power was small. Use a suitable gasket pad between the rotor and the bearing to move the rotor up and install the test machine. The fault can be eliminated.

3. After the power is turned on, the impeller does not turn.

After the power is turned on, the submersible pump has a humming sound, and the impeller does not rotate. Turn off the power and push the impeller at the water inlet. If it does not move, the rotor is stuck. The submersible pump can be disassembled to check whether the ball of the lower end bearing of the rotor is broken and the rotor is stuck; if the impeller can be turned, but the impeller does not rotate after being energized, the cause of the failure may be severe bearing wear, and the magnetism generated by the stator will attract the rotor when energized. Can't turn. Replace the bearing and reassemble the pump. The impeller is flexible and the fault is eliminated.

4, oil spill

The oil leakage of the submersible pump is mainly caused by the serious wear of the sealed box, resulting in oil leakage in the sealed box oil chamber or poor sealing at the outlet box.

When the oil in the sealed box oil chamber leaks, oil traces are visible at the water inlet section. There is a refueling hole at the water inlet section, and the screw is unscrewed to see if the oil chamber is filled with water. If the oil chamber enters the water, the seal is poor. The seal box should be replaced to prevent the oil chamber from entering the water and infiltrating into the motor. If the root of the submersible pump cable is oily, it is a leak in the motor. Generally, the sealing plug is poorly sealed or the lead is unqualified after the motor is re-wound; some are caused by the rupture of the pump terminal block. After the inspection is confirmed, you can change the qualified new product. And measure the insulation degree of the motor. If the insulation is not good, it should be treated in time, and the oil in the motor should be replaced.

5, leakage

Leakage is the most common failure of submersible pumps and one of the most dangerous factors that endanger personal safety. The fault phenomenon is that when the knife is closed, the leakage protector in the transformer power distribution room will trip (if there is no leakage protector, it will be quite dangerous, which will cause the motor to burn out). This is mainly due to the water in the pump body of the submersible pump, which causes the insulation resistance of the motor winding of the submersible pump to decrease, resulting in the action of the protector. At this time, use the R×10kΩ block of the shaker or multimeter to measure the motor winding to have a certain leakage resistance to the outer casing. The long-term use of the submersible pump causes severe wear of the mechanical seal end face, and the water penetrates thereby, soaking the motor winding to form a leakage. The removed submersible pump motor can be placed in a drying room or dried with a 100-200W incandescent bulb; the insulation resistance is measured to be infinite, then the mechanical seal is replaced, and the pump can be put into service.