What are the common pump failures? What is the pump solution?

What are the common pump failures? What is the pump solution? Pumps are machines that transport liquids or pressurize liquids. It will be the prime mover mechanical energy or other external energy transfer to the liquid, so that the liquid energy increases, mainly used to transport liquids including water, oil, acid and alkali, emulsion, suspension and liquid metal, but also can be transported liquid, gas mixture As well as liquids containing suspended solids. Pump performance measurement of the technical parameters of flow, suction lift, lift, shaft power, water power, efficiency, etc .; according to different working principle can be divided into volume pumps, vane pumps and other types. Volumetric pumps utilize the variation of their working chamber volume to transfer energy. Vane pumps use the interaction of rotating blades and water to transfer energy, such as centrifugal pumps, axial flow pumps, and mixed flow pumps. First, there are four reasons supporting motor overheating. First, the reasons for the power: high or low voltage, under a specific load, if the voltage range should be rated outside the range of + 10% to -5% will cause the motor overheating; power supply three-phase voltage asymmetry, power supply Phase imbalance of more than 5% of the phase voltage will lead to overheating windings; lack of phase operation, the experience shows that more than 85% of agricultural motor was burned due to lack of phase operation, the motor phase loss protection installed. Second, the reasons for the pump, the choice of power is not complete, small cart pull the motor overload operation for a long time, so that the motor temperature is too high; start too often, the fixed short-term or intermittent work of the motor system continuous work. Should limit the number of starts, the correct choice of thermal protection, according to the rated motor on the use of fixed. Third, the reasons for the motor itself; expose the error, will be mistakenly connected into a Y-shaped Y-shaped, so that the rapid rise of the motor temperature; stator windings have short-circuit between the turn to turn short or partial grounding, light motor overheating, serious insulation burning Bad; squirrel cage broken bar or defective, the motor running for 1 to 2 hours, the core temperature rises rapidly; through the system failure, you should check the fan is damaged, the rotation direction is correct, the ventilation hole is blocked; bearing wear, eccentric rotor Swept the chamber so that the rotor core will rub the metal percussion sound, the core temperature rises rapidly, serious motor smoke, or even coil burned. Fourth, the reasons for the work environment; motor winding damp or dust, oil and other attached to the winding, resulting in reduced insulation. Insulation resistance of the motor should be measured and cleaned, dried; Ambient temperature is too high. When the ambient temperature exceeds 35 ℃, the inlet air temperature is high, will make the motor temperature is too high, should try to improve their working environment, such as the tower shed shade. Note: due to electrical reasons for failure, should obtain a professional qualification certificate of electrician maintenance, illiterate people can not be blindly repaired to prevent personal injury accidents. Second, the lack of flow This is because: the power speed is not complete or belt slippage, the speed is low; axial pump blade mounting angle is too small; lack of head, the pipe is too long or the pipe has a right-angle bend; Valve, pipe and impeller partial blockage or impeller defect; outlet pipe serious water leakage. Remedy recovery speed, clear the belt grease, adjust the blade angle, reduce the pump installation location, shorten the pipe or change the curvature of the pipeline; seal the pump leak, compaction seasoning; remove obstruction, replace the impeller; Replace the leak ring, plug the leak. Third, the pump heat causes: bearing damage; rolling bearing or bracket cover gap is too small; shaft bending or two axes are not heart; tape is too tight; lack of oil or oil quality is not good; impeller balance hole plug, impeller out of balance, Increased thrust to the side. Remedy; Replace the bearing; Remove the rear cover, install the gasket between the bracket and the bearing seat; Investigate the pump shaft or adjust the concentricity of the two shafts; Adjust the tightness of the tape appropriately; Fill clean the butter, About 60% of the gap; clear balance hole plug. Fourth, the situation can not start First, check the power supply: whether the connection is solid; whether the contact switch is tight; whether the fuse is blown; three-phase power supply is equal. If there is an open circuit, poor contact, the fuse blown, lack of phase, should identify the cause and timely repair. Second, check if it is a pump mechanical failure, common reasons are: packing is too tight or between the impeller and the pump is clogged with debris caught; pump shaft, bearing, minus leakage ring rust; serious shaft pump bending . Remedy; Loose packing, clear diversion trough; Uncover the pump clear debris, rust; Remove the pump shaft to correct or replace the new pump shaft. Fifth, the suction is not due to the water pump is the body of air or gas intake pipe, or at the end of the valve is not strict irrigated water dissatisfaction, vacuum pump filling serious leaks, gate valve or shot closed lax. Exclusion method; first water pressure up, then the pump filled with water, and then boot. Colleagues check the check valve is tight, piping, fittings leaks, such as found leakage, remove the joint at the joints coated with oil or paint and tighten the screws. Check the pump shaft seal ring, such as serious wear and tear should be replaced with new pieces. Piping leaks or leaks. Screw may not be tight when installing. If the ginseng leakage is not serious, in the place of leakage or leakage of cement painted or coated with asphalt oil and grout. Temporary repair can be painted wet mud or soft soap. If the joint leaks can be tightened with a wrench nut, such as severe water leakage must be re-disassembly, replacement of cracked pipe; reduce the head, the pump nozzle into the water 0.5m. Six, violent vibration mainly for the following reasons: electric rotor imbalance; coupling with poor; bearing wear and tear; rotating parts of the parts loose, broken; pipe stent is not strong and other reasons. Can be taken to adjust, repair, reinforcement, straightening and other methods to deal with. Seven, the working principle Mechanical energy into liquid energy to achieve the purpose of pumping liquid machine collectively referred to as the pump. 1, positive displacement pump: the use of the working chamber volume change of periodic delivery of liquid. 2, vane pump: the use of leaves and liquid interactions to transport liquid.