Submersible Pump Failure And Troubleshooting

Sanitary Centrifugal Pump The main reasons and troubleshooting methods for insufficient flow or lack of water during operation:

1. The installation height of the water pump is too high, which makes the impeller immersed in depth insufficient, resulting in a decrease in the water output of the water pump. (Control the allowable deviation of the installation elevation of the water pump and do not expand it at will) 2. The water pump rotates in the opposite direction. (Before the water pump is tested, run the motor idle first and check the rotation direction to make it consistent with the water pump. If the above situation occurs during use, check whether the power phase sequence has changed) 3. The water outlet valve cannot be opened. (Check the valve and maintain the valve regularly) 4. The water outlet pipeline is not smooth or the impeller is blocked. (Clean up the obstructions in the pipeline and impeller, and often salvage the debris in the reservoir) 5. The wear-resistant ring at the lower end of the water pump is severely worn or blocked by debris. (Replace the wear-resistant ring at the lower end and clean up the debris) 6. The density of the pumped liquid is too large or the viscosity is too high. (Re-equip with a matching pump) 7. The impeller falls off or is damaged. (Reinstall or replace)   8. When multiple water pumps share the same pipeline output, the one-way valve is not installed or the one-way valve is not sealed tightly. (Install the one-way valve and replace the one-way valve seal)   3. The submersible pump does not rotate when starting   The main reasons and troubleshooting methods for the submersible pump to fail to start:   1. The power switch and plug are not in good contact. (Repair or replace)   2. The control circuit fuse is burned out. (Replace the fuse)   3. The main circuit fuse is burned out. (Replace the fuse)   4. The two-phase submersible pump capacitor is burned out. (Replace the capacitor)   5. The three-phase submersible pump is missing a phase. (Connect the phase-off circuit)

The large current during the operation of the stainless steel submersible pump is related to the adjustment of the water pump valve and the mechanical failure of the motor. The main reasons are as follows:

1. Wear of the motor guide bearing, wear of the water pump rubber bearing, and wear of the sealing ring. The wear of the motor or water pump bearing will cause the submersible pump to be in an abnormal working state mechanically, and seriously damage the submersible electric pump and burn out the stator winding. The treatment method is to repair or replace the damaged bearings and sleeves. 2. The flow rate of the submersible pump is too large or too small. The flow rate used beyond the use range will cause the motor to overload: for centrifugal water pumps or mixed flow water pumps, the flow rate is too large, the shaft power of the water pump increases, and the motor will be overloaded; for axial flow water pumps, the flow rate is too small, the shaft power of the water pump increases, and the motor will be overloaded. The treatment method is to properly adjust the valve, reduce the flow rate of centrifugal water pumps or mixed flow water pumps (increase the flow rate of axial flow water pumps), so that the flow rate of the water pump is within the normal use range. 3. The submersible pump shaft is bent and the bearing is not concentric. This is a serious situation. It should be repaired immediately, the bent shaft should be straightened, the unqualified bearings should be replaced, and the submersible electric pump should be reassembled. 4. Wear of thrust bearings, wear of submersible pump impellers and lower cover plates. This situation will also cause the submersible pump to be in an abnormal working state mechanically, and serious damage to the submersible electric pump. The treatment method is to check the cause of the wear of the thrust bearing, whether the mechanical seal at the shaft extension end is damaged, causing sand, impurities, etc. to enter the inner cavity of the motor and cause excessive wear of the thrust bearing. If the cause is caused by mechanical seal, the mechanical seal at the shaft extension end should be replaced while repairing or replacing the worn thrust bearing, thrust plate, impeller, lower cover and other parts. 5. The large current during the operation of the submersible pump is related to the selection. The submersible pump has too large a head and the actual head is small.