Common faults and solutions of the hottest water p

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Common faults of water pump and solutions

first, the supporting power motor is overheated

there are four reasons. 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. The motors shall be installed with lack of phase protection devices

the second reason is the water pump. The power is not matched, the small horse pulls the cart, and the motor runs overloaded 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; Expose the error, and connect the delta shape to the Y shape by mistake, so that the temperature of the motor rises 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 system fails, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation hole is blocked; Bearing wear and eccentric rotor bore sweeping make the stator and rotor iron cores rub against each other and produce metal impact sound. The iron core temperature rises rapidly. The force value accuracy of the cement mortar bending test machine is easy to reach. In serious cases, the motor smokes and even the coil is burned

fourth, the reason of working environment; The motor winding is damp or dust, oil stain, 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 motor temperature too high. Try to improve its working environment, such as tower shed shading, etc. Note: if a fault occurs due to electrical reasons, it should be repaired by an electrician who has obtained a professional qualification certificate. People with a little knowledge should not repair it blindly to prevent personal injury accidents

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II. Insufficient flow

this is because: the power speed is not matched or the belt slips, which makes the speed low; 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. Exclusion method; It is necessary to set the rotation speed according to the recovery, remove the belt oil dirt, and adjust the blade properly, so as to collect the pneumatic blade angle of the whole industry, reduce the installation position of the water pump, shorten the pipeline or change the bending degree of the pipeline; Seal the air leakage part of the water pump and compress the seasoning; Remove the blockage and replace the impeller; Replace the leakage reducing ring and plug the water leakage

III. water pump heating

cause: bearing damage; The clearance of rolling bearing or bracket cover is too small; 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. Exclusion method; 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; Clear the blockage in the balance hole

IV. failure to start

first, check the power supply: whether the connector is firmly connected; Whether the switch contacts tightly; Whether the fuse is blown; Whether the 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. 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. Exclusion method; Loosen the filler and dredge the water channel; Disassemble the pump body to remove sundries and rust; Remove the pump shaft for calibration or replace it with a new one

v. unable to suck water

originally, it also had strong big data analysis ability. Because there was air in the pump body or air accumulated in the water inlet pipe, or the bottom valve was not closed tightly, the filling water of the vacuum pump was insufficient, the vacuum pump packing was seriously leaking, and the gate valve or flap valve was not closed tightly. Exclusion method; First increase the water pressure, then fill the pump body with water, and then start the machine. Colleagues shall check whether the check valve is tight and whether there is air leakage in the pipeline and joints. If air leakage is found, apply lubricating oil or mixed paint on the joints 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 there is serious water leakage, 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. severe vibration

mainly has 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 and straightened respectively

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