As an important industrial equipment, deep well pumps are widely used in various scenarios such as deep well water intake, drainage, and agricultural irrigation. However, due to the complex working environment, deep well pumps are prone to malfunctions during operation, such as motor failure, low flow or head, and pump body leakage.
Therefore, timely and accurate disassembly and maintenance of deep well pumps are of great significance for ensuring their normal operation.
The dismantling of deep well pumps is a complex and meticulous task that requires strict procedures to be followed.
Firstly, the power should be turned off and the water source cut off to ensure safety. Next, use a tripod and a manual hoist to slowly lift the pump seat and the downhole part to a certain height. During this process, it is necessary to use clamping plates to clamp the lifting pipes and gradually separate each level of lifting pipes from the pump body. When disassembling the impeller, it is necessary to use a sleeve to press against the small end face of the conical sleeve, and separate the impeller from the conical sleeve by hammering the other end of the sleeve. During the entire disassembly process, the installation position and sequence of each component should be recorded in detail for subsequent assembly.
Maintenance points
1. Motor does not start:
Firstly, the insulation of the motor should be checked for compliance. If the insulation resistance is below 50 megohms, it may be due to moisture or water ingress into the motor. At this point, the motor needs to be disassembled, damaged parts replaced, and dried. If the insulation resistance is normal, it may be an internal fault of the cable or motor, and further testing and replacement of corresponding accessories are required.
2. Low flow rate or head
Low: Check if the power supply voltage is stable. If the voltage is too low, adjust the power supply circuit. If the voltage is normal, it may be a local short circuit in the motor coil or a blockage in the impeller. Use a multimeter to measure the actual current of the motor. If it exceeds 80% of the rated current, replace the motor coil. At the same time, the impeller and filter screen should be checked for blockage and cleaned in a timely manner.
3. Pump body leakage:
The leakage of the pump body may be caused by loose nuts or aging seals during installation. For minor leaks, temporary repairs can be made by applying cement or asphalt oil to the leaking area. If the water leakage is severe, it is necessary to disassemble and replace the sealing components.
4. Abnormal vibration: Severe vibration of deep well pumps during operation may be caused by unbalanced electric rotors, bearing wear, or improper installation. It is necessary to check and adjust the rotor balance, replace worn bearings, and reinforce the installation bracket.
Assembly after repair
After the maintenance is completed, the deep well pump should be gradually assembled according to the disassembly records. Firstly, insert the pump shaft into the inlet pipe and install the gasket and nut. Next, assemble the impellers and pump bodies at all levels in order, and check whether the axial displacement of the rotor meets the requirements. Finally, install the transmission device and motor part, and perform electrical connection and sealing treatment.
