The submersible motor is matched with various types of submersible pumps and forms an integral part with the pump. It can operate in sewage of various water qualities for a long time. The harsh working environment determines that its sealing structure is significantly different from that of conventional motors.
ONE.Reasons and treatment methods for insufficient flow or no water output during the operation of submersible pumps
(1) The installation height of the water pump is too high, resulting in insufficient immersion depth of the impeller and a decrease in the water output of the water pump; The allowable deviation for controlling the installation elevation of the water pump should not be arbitrarily expanded.
(2) The direction of rotation of the water pump is opposite. Before the trial operation of the water pump, the electric motor should be idling and the direction should be checked to make it consistent with the water pump; If the above situation occurs during use, check whether the phase sequence of the power supply has changed.
(3) The water outlet valve cannot be opened. Inspect valves and regularly maintain them.
(4) The water outlet pipeline is not smooth or the impeller is blocked. Clean up blockages in pipelines and impellers, and frequently salvage debris from the reservoir.
(5) The wear-resistant ring at the lower end of the water pump is severely worn or blocked by debris. Clean up debris or replace wear rings.
(6) The density or viscosity of the pumped liquid is too high. Identify the causes of water quality changes and implement measures to address them.
(7) The impeller is detached or damaged. Reinforce or replace the impeller.
(8) When multiple water pumps share the same pipeline output, one-way valves are not installed or the sealing of one-way valves is not tight. After checking the cause, install or replace the one-way valve.
TWO.The main cause of abnormal vibration and instability in the operation of submersible pumps
(1) The anchor bolts of the water pump base are not tightened or loose; Tighten all anchor bolts evenly
(2) The water outlet pipeline is not supported independently, and the vibration of the pipeline affects the water pump; Provide independent and stable support for the outlet pipe of the water pump to prevent the flange of the outlet pipe from bearing weight.
(3) Impeller quality imbalance, even damage or loose installation; Repair or replace the impeller
(4) The upper and lower bearings of the water pump are damaged; Replace the upper and lower bearings of the water pump.
THREE.The main cause of motor overload or overheating caused by excessive current in submersible pumps
(1) Low or high working voltage; Check the power supply voltage and adjust the output voltage.
(2) There is friction between dynamic and static components inside the water pump or friction between the impeller and the sealing ring; Determine the position of friction components and eliminate faults.
(3) Low head and high flow rate result in motor power not matching the characteristics of the water pump; Adjust the valve to reduce the flow rate and match the motor power with the water pump.
(4) The pumping density is high or the viscosity is high; Check the causes of water quality changes and change the working conditions of the water pump
(5) Bearing damage; Replace the bearings at both ends of the motor
FOUR.The main reasons and treatment methods for the low insulation resistance of submersible pumps
(1) When installing the power cord, the end is submerged in water or the power cord or signal cord is damaged, causing water ingress; Replace the cable or signal line and dry the motor.
(2) Mechanical seals worn or not installed properly; Replace the upper and lower mechanical seals and dry the motor.
(3) O-ring aging and loss of function; Replace all sealing rings and dry the motor.
