fuyangby@126.com
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fuyangby@126.com
86 15188770013
Root cause analysis of increased noise in slurry pump
The increase in noise of slurry pumps is usually related to mechanical structural abnormalities, installation problems, or changes in medium characteristics. The specific reasons are as follows:
Wear or looseness of mechanical components: Transmission device failure, pump body looseness, excessive wear of impellers or bearings can cause abnormal vibration and noise during operation. In addition, unbalanced impeller rotor and poor coupling connection can also cause severe vibration.
Installation and alignment issues: Improper installation of the pump body, misalignment or parallelism deviation between the motor shaft and the pump shaft can result in additional stress and vibration noise during operation.
Media and pipeline factors: Uneven medium density (such as during initial start-up), uneven intake of the suction pipe, or pipeline blockage can cause fluid impact noise; Pipeline leakage or air leakage may also exacerbate vibration.
Cavitation and cavitation phenomenon: When the local pressure inside the pump is lower than the saturated vapor pressure of the medium, cavitation will occur, causing damage to the impeller surface and accompanied by high-frequency noise.
System treatment plan for increased noise of slurry pump
Mechanical and structural optimization
Component inspection and replacement:
Disassemble the pump body, inspect the wear of components such as impellers, bearings, and sealing rings, and replace aging or damaged parts.
If the coupling is not properly connected, readjust the alignment or replace the elastic connector.
Clean the blockage in the impeller flow channel to ensure smooth flow of the medium.
Installation accuracy adjustment:
Use a spirit level to calibrate the installation levelness of the pump body, and adjust the gasket to ensure that the concentricity error between the motor shaft and the pump shaft is ≤ 0.1mm/m.
Pipeline and medium management
Pipeline optimization:
Check the sealing of the suction pipeline, repair any air leaks (such as applying sealant or replacing joints), and prevent air from entering.
Shorten the length of high head pipelines, reduce the number of right angle elbows, and lower flow resistance.
If the medium has a high gas content, add an exhaust valve or buffer tank.
Media preprocessing:
Before starting, stir the medium with high-pressure air to ensure uniform density and avoid impact noise caused by high local concentration.
Noise suppression and monitoring
Vibration and noise reduction measures:
Install anti vibration pads (such as rubber pads or spring shock absorbers) between the pump body and the foundation to reduce vibration transmission.
Wrap the pump casing with sound-absorbing material (such as glass wool) or install a soundproof cover.
Running status monitoring:
Real time monitoring of motor current, bearing temperature, and vibration spectrum. When the current fluctuates abnormally (such as below 10% of the rated value), stop the machine in a timely manner to investigate blockages or impeller wear issues.
Preventive maintenance strategy
Key points for maintaining project cycle operations
Lubrication inspection of bearings: Add lithium based grease every week, with a grease amount of 1/2~2/3 of the bearing chamber volume, to avoid excessive heating
Impeller dynamic balance testing is calibrated quarterly using a dynamic balance meter, with an imbalance of ≤ 5g · mm
Clean the sealing water system by dredging the sealing water pipeline every month to ensure a sealing water pressure of 0.1~0.3MPa and prevent wear of the packing
Corrosion inspection of pipelines: Conduct wall thickness testing on metal pipelines every six months, and replace lining rubber or ceramic composite pipes when the corrosion rate exceeds 30%
Typical Fault Cases and Emergency Response
Case 1: High frequency noise caused by cavitation
Phenomenon: Fluctuations in pump outlet pressure and localized honeycomb like corrosion pits on the impeller.
handle:
Reduce the installation height of the pump to ensure that the suction head is equal to or greater than the device cavitation head (NPSHa).
Replace the anti cavitation material impeller (such as high chromium cast iron or bimetallic alloy).
Case 2: Abnormal noise caused by bearing wear
Phenomenon: When the bearing temperature exceeds 70 ℃, the stethoscope detects a "rustling" friction sound.
handle:
Stop the machine and replace the bearings, while checking the wear of the shaft neck. If necessary, perform chrome plating repair.
Adjust the bearing clearance to 0.05~0.1mm (determined according to the model).
Through the above measures, the source of noise can be effectively located and targeted treatment can be implemented. At the same time, combined with preventive maintenance, the failure rate can be reduced by more than 40%, and the service life of the pump unit can be extended to more than 8000 hours.
This article originates from https://www.fuyangpumps.com/news/492.html. Please indicate the source when reprinting.
(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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