Centrifugal pumps often occur in the operation of a variety of faults for many reasons, the occurrence of different parts, mostly due to maintenance, installation of poor quality, or improper operation and maintenance caused. The following is a variety of centrifugal pump failure phenomenon, causes of failure and treatment methods. Failure phenomenon Causes of failure Treatment Pumping dissatisfaction 1, the end of the valve closed laxity, suction pipe leakage 2, the end of the valve has been damaged 1, overhaul the end of the valve and pipette 2, repair or replacement of the valve pump is not suction , The vacuum gauge indicates a high degree of vacuum 1, the bottom valve is not open or filter part of the block 2, the pipette resistance is too high 3, the suction height is too high 4, the suction part of the immersion depth is not enough 1, 2, clean or replace the pipette 3, appropriate to reduce the suction height 4, increase the suction part of the submerged depth pump is not suction, vacuum and pressure gauge pointer violently beating 1, before driving the pump less than 2 irrigation liquid, suction pipe Or instrument leakage 3, the pipette is not immersed in the liquid or immersed in the depth is not enough 1, stop the pump liquid filled 2, check the pipette and instrument, and to eliminate leakage or block leakage part 3, reduce Pipette, so immersed in the liquid has a certain depth Although the pressure gauge pressure, but no liquid drainage pipe 1, drain resistance is too large 2, the tower operating pressure is too high 3, impeller steering is wrong 4, impeller flow Road blockage 5, pump head is not enough 6, drainage pipe valve is closed 1, cleaning row Liquid pipe or reduce the pipe elbow 2, contact with the operator to adjust the tower pressure 3, replace the motor wiring 4, clean the impeller 5, replace the high-lift pump pump in series 6, open the drain valve flow is insufficient or not absorbing liquid 1, the seal ring radial gap increases, the internal leakage increases 2, the impeller flow blockage, affecting the circulation 3, part of the liquid absorption resistance, such as part of the filter blockage, elbow too much, the end of the valve is too small 4, suction On the height is too large 5, the suction part of the immersion concentration is not enough, there is air into the 6 suction part of the seal is not tight 7, the pipette is not installed properly, so that there is accumulation of air in the tube there 8, the drainage pipe resistance is too large, Or outlet valve is not open enough 9, the tower operating pressure is too high 10, the transmission liquid temperature is too high, the pump cavitation phenomenon, continuous water can not 11, the pump flow is too small 1, overhaul sealing ring 2, cleaning impeller runner 3, cleaning the filter to reduce the elbow and replace the valve at the bottom 4, to reduce the suction height 5, increase the immersion depth of the suction part 6, overhaul the suction part of the joint seal, tighten the nut or replace the filler 7, re-install the suction Pipette 8, pipe cleaning, or open properly Outlet valve 9, contact with the operator to adjust the tower pressure 10, appropriate to reduce the temperature of liquid transport to reduce the installation of the pump height, leaving allowance cavitation margin 11, replacement of large flow pump packing leaking too much 1, packing Wear 2, the packing pressure is not tight 3, packing installation error 4, the pump shaft bending or wear 1, replace the packing 2, tighten the packing gland or additional packing 3, re-install the packing 4, repair or replace the pump shaft packing overheating 1, Packing too tight 2, the cooling water can not get in 3, the shaft and sleeve surface damage 1, appropriate to relax the filler 2, loose packing or infusion tube packing ring hole is blocked 3, repair the shaft surface or replace the sleeve bearings Overheating 1, poor lubrication oil or insufficient oil in the bearing 2, the shaft has been bent or bearing ball out of round 3, the bearing is not properly installed or the gap is not appropriate 4, the shaft and motor shaft concentricity does not meet the requirements 5, the bearing wear Or loose 6, balance disc loss of function 1, the replacement of qualified new oil, and add enough fuel 2, repair or replacement parts 3, check and repair 4, re-find 5, check or replace the bearing 6, check the balance is blocked, Maintenance balance plate and Balance ring should be parallel to each other and make it perpendicular to the pump shaft; replace the balance ring or balance plate vibration 1, the uneven wear of the impeller or part of the runner blockage, resulting in imbalance of the impeller 2, the bearing wear 3, the shaft bending 4 , The seal ring of the pump body, the balance ring and other friction parts with the rotor 5, parts of the rotating loose or broken 6, cavitation occurs in the pump 7, two coupling bad combination 8, the anchor bolts loose 1, the impeller Balance or correct the impeller 2, repair or replace the bearing 3, straighten or replace the pump shaft 4, to eliminate friction while ensuring a smaller seal gap 5, repair or replacement of wear parts 6, eliminate the causes of cavitation 7, re-adjust the installation 8, tighten the anchor nut