Six common faults of the hottest water pump and th

2022-08-02
  • Detail

Six common faults of water pump and their solutions

water pump is the main drainage and irrigation machinery for rural domestic water and spring planting and summer sowing. During operation, it is inevitable that faults and damages will occur, so that normal pumping cannot be carried out. Therefore, the pump with poor pumping must be repaired and adjusted to eliminate the fault in time

I. if it cannot be started, first check the power supply: whether the connector is firmly connected; Whether the switch contacts tightly; Whether the fuse is blown; Whether three-phase power supply is equal. In case of open circuit, poor contact, fuse fusing and phase loss, the cause shall be found out and repaired in time. Secondly, check whether it is the mechanical failure of the pump itself. The common reasons are: the packing is too tight or the impeller and the pump body are blocked by sundries; The pump shaft, bearing and leakage reducing ring are rusted; The pump shaft is severely bent. Elimination method: loosen the filler and dredge the water diversion tank; Disassemble the pump body to remove sundries and rust; Remove the pump shaft for calibration or replace it with a new one

II. There are four reasons for overheating of supporting power motor. First, the power supply: the voltage is too high or too low. Under a specific load, if the voltage variation range should be beyond + 10% to - 5% of the rated value, the motor will overheat; The three-phase voltage of the power supply is asymmetric, and the phase to phase imbalance of the three-phase voltage of the power supply exceeds 5%, which will lead to overheating of the winding; Lack of phase operation. Experience shows that more than 85% of the burned agricultural motors are caused by lack of phase operation. Lack of phase protection devices shall be installed on the motors. The second reason is the water pump: the power is not matched, the small horse pulls the cart, and the motor overloads for a long time, which makes the motor temperature too high; The motor that starts too frequently and is rated as short-time or intermittent working system works continuously. The starting times shall be limited, the thermal protection shall be correctly selected and used according to the rated value on the motor. The third reason is the motor itself: the connection method is wrong, and the delta shape is wrongly connected to the Y shape, which makes the temperature of the motor rise rapidly; Stator winding has phase to phase short circuit, turn to turn short circuit or local grounding. In case of light, the motor is overheated locally, and in case of serious, the insulation is burnt out; The bar of squirrel cage rotor is broken or defective. When the motor runs for 1 to 2 hours, the iron core temperature rises rapidly; If the ventilation system fails, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation duct is blocked; Bearing wear and rotor eccentric bore sweeping make the stator and rotor iron cores rub against each other and produce metal impact sound. The iron core temperature rises rapidly. In serious cases, the motor smokes and even the coil is burned. Fourth, the working environment: the motor winding is damp or dust, oil, etc. are attached to the winding, resulting in reduced insulation. The insulation resistance of the motor shall be measured and cleaned and dried; The ambient temperature is too high. When the ambient temperature exceeds 35 ℃, the high air inlet temperature will make the temperature of the motor too high. Try to improve its working environment. Such as putting up a shed for shading. Note: in terms of electricity, the board mentioned here does not refer to the failure of the computer board. It should be repaired by an electrician who has obtained a professional qualification certificate. People with a little knowledge should not repair blindly to prevent personal injury accidents

III. water. Therefore, pay attention to the application conditions of the experimental machine. Environmental pump heating causes: bearing damage; The gap between the precipitates and grain size bracket cover in the alloy before and after heat treatment is too small for the rolling bearing or inspected by optical microscope; The pump shaft is bent or the two shafts are not concentric; The tape is too tight; Lack of oil or poor oil quality; The balance hole on the impeller is blocked, and the impeller loses balance, increasing the thrust to one side. Troubleshooting: replace the bearing; Remove the rear cover, and install a gasket between the bracket and the bearing seat; Investigate the pump shaft or adjust the concentricity of the two shafts; Properly loosen the belt tightness; Add clean grease, which accounts for about 60% of the clearance in the bearing; Remove the blockage in the balance hole

IV. without silicon materials, there will be no integrated circuit and the information society will have insufficient flow. This is because: the power speed is not matched or the belt slips, resulting in low speed; Axial flow pump blade installation angle is too small; The lift is insufficient, the pipeline is too long or the pipeline has a right angle bend; High suction lift; The bottom valve, pipeline and impeller are partially blocked or the impeller is damaged; The water outlet pipe leaks seriously. Troubleshooting: restore the rated speed, remove the belt oil dirt, and adjust the belt tightness; Adjust the blade angle, lower the installation position of the water pump, shorten the pipeline or change the bending of the pipeline; Seal the air leakage of the water pump and compress the packing; Remove the blockage and replace the impeller; Replace the leakage reducing ring and plug the water leakage

v. the reason why water can not be sucked is that there is air in the pump body or air accumulated in the water inlet pipe, or the bottom valve is not closed tightly, the filling water is insufficient, the vacuum pump packing is seriously leaking, and the gate valve or flap valve is not closed tightly. Troubleshooting: first increase the water pressure, then fill the pump with water, and then start the machine. At the same time, check whether the check valve is tight and whether the pipeline and joint have air leakage. If air leakage is found, apply lubricating oil or mixing paint on the joint after disassembly, and tighten the screws. Check the oil seal ring of the water pump shaft. If it is worn seriously, replace it with a new one. The pipeline leaks water or air. The nuts may not be tightened during installation. If the leakage is not serious, cement can be applied at the place where the air or water leaks, or cement slurry mixed with asphalt oil can be applied. For temporary repairs, apply some wet mud or soft soap. If there is water leakage at the joint, the nut can be tightened with a wrench. If the water leakage is serious, it must be disassembled again and the cracked pipe must be replaced; Reduce the lift and press the nozzle of the water pump into the water for 0.5m

VI. the violent vibration is mainly caused by the following reasons: the electric rotor is unbalanced; Poor coupling connection; Bearing wear and bending; Loose and broken parts of rotating parts; The pipeline support is not firm. They can be adjusted, repaired, reinforced, straightened and replaced respectively

the above conditions are the common causes of water pump failure, not all of them. In practice, when dealing with the failure, due to actual analysis, the principle of "from outside to inside" should be followed, and blind operation should not be allowed

Copyright © 2011 JIN SHI