Analysis of fountain pump failure

Fountain pump failure analysis, fountain pump, fountain pump flow is insufficient, the occurrence of cavitation, etc. are hydraulic failure. Pump does not run, overheating of the bearing is a mechanical failure. Under normal circumstances, the two faults exist in a phenomenon, such as the lack of head, pump Diao deep operation there is no abnormal vibration and sound.
Troubleshooting should follow the following principles: with the fault should be promptly excluded, the machine can not make sick work. Troubleshooting should: clarify the performance, analysis of a reason to be eliminated. The cause of the failure should be analyzed in many ways, and strive to accurately determine. Exclusion of specific conditions should be specific treatment, can not be mechanically applied.
Analysis and Solution of Common Fault
1) the pump does not water, usually due to a impeller flow path blocked by debris, 2 pump impeller reverse direction of operation, 3 device head beyond the pump design head range caused. As long as the clean-up impeller flow channel, re-connect the motor power cord and re-select the appropriate pump can solve the problem.
4) bending deformation of the pump shaft. With the dial gauge to measure the o axis of the pump shaft in the radial volume, if it is rolling bearings, usually should not be more than 0.05mm beating, if it is sliding bearings, sliding bearing friction should not exceed the gap. In addition, check the rotation of the shaft and wheel rotation Yi, pump normal operation, at different speeds have different rotation jitter allowed value, usually 1450 r / min allowable value of not more than 0.15mm, 2900 points in time to allow The value is less than or equal to 0.10 mm. If the permissible value is exceeded, the shaft and wheel v are measured circumferentially point by point to see if the wheel 0 is eccentric, or is not concentric, or the shaft is bent. It is also possible that the axis is good for neutrality, the rotation is very large, or there is no rotation Mm, but the pay neutral is poor, should be corrected.
5) There is abnormal vibration and sound when the pump is running. It is usually caused by the poor neutral of pump shaft and motor shaft, bending deformation of pump shaft, cavitation of running and friction of rotating parts. If none of the above problems exists, Feet, pump shell bolts without loosening, check the pump pipe there is a clear stress. If the stress is too great, it should be supported at the inlet or outlet to reduce or eliminate stress. Remove and reinstall if necessary.
2) Lack of head, pump outlet pressure can not meet the needs of working conditions. There are many reasons for this failure: pump cavitation, impeller wear and tear after long-term use, supporting the motor speed is lower than the required pump speed, etc., will lead to lower pump head. Increase the level of the pump inlet level or Yang lk pump installation location, can avoid the occurrence of cavitation. Replacement of the impeller is worn, and select the pump to match the motor, is one of the ways to troubleshoot.
3) bearing overheating, bearing more than the normal temperature range. Generally due to a bearing housing lack of oil or 2 oil deterioration caused by bearing temperature anomalies. In the timely confirmation of the reasons to add grease, update the lubricating oil, so as not to damage the bearings. Second, the cause of bearing overheating and 3 pump shaft, motor shaft is not concentric,