Common faults and solutions of pumps

Common faults and solutions of the pump:

First, the supporting power motor overheated

There are four reasons. The first is power supply reasons: the voltage is high or low. Under a specific load, if the voltage variation range should be +10% to -5% of the rated value, it will cause the motor to overheat; the three-phase voltage of the power supply is asymmetric, the power supply Three-phase electric voltage phase imbalance degree exceeds 5%, will lead the winding to overheat; lack of phase operation, experience shows that more than 85% of agricultural motor is burned down is caused by the lack of phase operation, the lack of phase protection device for the motor installation. The second is the reason of the pump. The power is not matched. The small horse-drawn cart and the electric motor are overloaded for a long time, which makes the motor temperature too high. The motor that starts too frequently and the short-term or intermittent work schedule is used continuously. Limit the number of start-ups, use thermal protection correctly, and use the rated value on the motor. The third is the cause of the motor itself; exposing mistakes, mistakenly connecting the △ shape into a Y-shape, causing the temperature of the motor to rise rapidly; the stator windings have phase-to-phase short circuits, turn-to-turn short circuits, or partial grounding; when the light motor partially overheats, the insulation burns when serious. Bad; squirrel cage rotor broken or defective, the motor runs for 1 to 2 hours, the core temperature rises rapidly; through the system failure, should check whether the fan is damaged, the rotation direction is correct, the ventilation hole is blocked; bearing wear, rotor eccentricity The broom sweeps the iron core of the rotor and emits a metal impact sound. The temperature of the iron core rises rapidly. In serious cases, the motor smokes and even the coil burns. The fourth is the cause of the working environment; motor windings are damp or dust, oil, etc. adhere to the windings, resulting in reduced insulation. The insulation resistance of the motor should be measured and cleaned and dried; the ambient temperature is too high. When the ambient temperature exceeds 35°C, the high temperature of the air inlet will make the temperature of the motor excessively high. Therefore, it is necessary to improve the working environment, such as the shade of the shed. Note: If there is a failure due to electrical reasons, an electrician who has obtained a professional qualification certificate is required to repair it. A person with little knowledge should not blindly repair it to prevent personal injury accidents.

Second, insufficient traffic

This is because: the power speed is not matched or the belt slips, so that the speed is low; the installation angle of the axial pump blade is too small; the head is insufficient, the pipeline is too long or the pipeline has a right angle bend; the suction process is high; the bottom valve, pipeline And the impeller is partially blocked or the impeller is missing; the outlet pipe is seriously leaking. Remedy method; restore a fixed speed, remove the belt grease, adjust the blade angle, reduce the pump installation position, shorten the pipeline or change the curvature of the pipeline; sealed pump leakage, tightly seasoning; remove the blockage, replace the impeller; Replace the leak relief ring and block the leak.

Third, the pump heat

Causes: Bearing damage; rolling bearing or bracket cover clearance is too small; pump shaft is bent or two axes do not center; tape is too tight; oil or oil is not good; balance hole in impeller is blocked, impeller loses balance, increased One side thrust. Remedy; replace the bearing; remove the back cover, install the gasket between the bracket and the bearing seat; investigate the shaft of the pump or adjust the concentricity of the two shafts; properly loosen the tightness of the tape; add clean butter, butter in the bearing About 60% of the gap; Clearly balance the blockage in the hole.

Fourth, can not start the situation

First of all, check the power supply: whether the connector connection is firm; whether the switch contact is tight; whether the fuse is blown; whether the three-phase power supply is equal. If there is a broken circuit, poor contact, blown fuse, or lack of phase, the cause should be identified and repaired in a timely manner. Second, check whether the pump is a self-generated mechanical failure. The common causes are: too tight packing, or jamming between the impeller and the pump body caused by debris; the pump shaft, bearing, and the leakage reduction ring are rusted; the pump shaft is seriously bent. Remedy method; Relax the packing, and clear the sink; Disassemble the pump body for clear debris, remove rust; Remove the shaft calibration or replace the new shaft.

Fifth, can not absorb water

The reason is that there is air in the pump body or the product gas in the inlet pipe, or the bottom valve is closed and the water is not filled properly, the vacuum pump packing is seriously leaking, and the gate valve or flap door is not closed. Remedy; press water first, fill the pump with water, and turn it on. Colleagues checked the tightness of the check valve and whether there was a leak in the pipes or fittings. If leaks were found, apply lubricant or paint to the joints after disassembly, and tighten the screws. Check the oil seal ring of the pump shaft. If it is worn out, replace it with a new one. The pipe leaks or leaks. The nuts may not be tightly tightened during installation. If the leakage is not serious, you can apply cement at the place where the air leaks or water leaks, or apply bitumen oil to the cement slurry. Temporary repairs may be coated with wet mud or soft soap. If there is water leakage at the joint, use a wrench to tighten the nut. If the leakage is serious, the nut must be disassembled and replaced. Replace the cracked pipe. Reduce the lift and press the pump nozzle into the water for 0.5m.

Violent vibration

There are several main reasons: the unbalance of the electric rotor, the poor coupling, the wearing of the bearing, the looseness and rupture of the parts of the rotating parts, and the inability of the pipe support. Can be adjusted, repaired, strengthened, and straightened.