Urgent! Causes and solutions for radial vibration of the bearing at the compressor drive end
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Urgent! Causes and solutions for radial vibration of the bearing at the compressor drive end
Reasons for misalignment include pipeline stress, as well as possible rotor imbalance
What medium is it? With air, dust affects the dynamic balance. Recheck alignment. Is the bearing in good condition?
Were there any signs beforehand, such as the vibration gradually increasing? If it’s a mutation, it might be a false positive!
Is on-site testing available? There are many reasons for the large vibration; since it is a sudden change, alignment is unlikely to be the issue, and it could be a problem with the oil.
Sudden vibration; this is likely caused by sudden fluctuations in the parameters of the pipeline network. Possible reasons for excessive vibration include: 1. Poor rotor stability; check whether the compressor manufacturer conducted a stability analysis of the rotor. 2. The bearing oil film has been damaged; check whether the bearing shells are scratched and whether the bearing specific pressure is too high. 3. There is a problem with the lubricating oil; check whether the oil pipeline is blocked and whether there is an issue with the quality of the oil. The issues related to bearing vibration pertain only to the bearing itself, the rotor, and the oil; by examining these three aspects in detail, it is generally possible to identify the problem
To find the cause, it is necessary to consider various phenomena before and after getting out of the vehicle, as well as the relevant data
Has the motor speed changed? In one instance at our company, the inverter indicated an input voltage deficiency, which caused the Siemens motor’s speed to drop by over a thousand revolutions; this led to an immediate increase in vibration of the large gear, triggering an overpressure alarm that resulted in automatic shutdown. Have an electrical engineer check whether there is anything wrong with the vibration sensor to ensure accuracy. I hope this helps you.
With the sudden vibration, I remembered an example I had experienced. The vibration of the bearings in the circulator suddenly increased and this persisted for several days; it was decided to disassemble and inspect them. The bearings were found to be undamaged. After cleaning the rotor under high pressure, it was discovered that there was a piece of cloth wrapped around the flow channels of the impeller – it was this cloth that caused the imbalance and the increased bearing vibration. . You can check the inlet filter first
There are many reasons that can cause vibration; issues such as worn bearings, poor lubrication, poor alignment, poor rotor balance, or static and dynamic friction are all possible causes. It is recommended that you describe in detail the pattern of vibration you are experiencing