The centrifugal blower experiences significant axial vibration
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Our company has a centrifugal blower for the wastewater biological treatment tank; its bearings exhibit normal horizontal and vertical vibrations, but high axial vibration. Could this be caused by rotor shift? Or are there other reasons? Is there a solution?
I’m not sure about the connection method of your fan – whether it’s a direct connection or one using a coupling – so I can’t make any further judgments. In the case of a direct connection, the problem could lie with the rotor shaft, the motor end cover, or the motor itself
The specific issue is as mentioned downstairs; a disassembly inspection is required. It’s recommended to prepare in advance to avoid sudden damage
This post was last edited by CHANGBAISHI on 2020-3-13 09:48. Is your \"high axial vibration\" within the specified limits? Normal fans are equipped with thrust bearings; shaft drive is not possible. If the motor bearings are rolling bearings, there is no play; whereas with sliding bearings, there is a magnetic center line, resulting in a certain amount of play. This type of backlash is usually also restricted by the thrust bearings in gearboxes or fan compressors. If the phenomenon you are referring to is vibration beyond the designed values, it is necessary to analyze things from scratch – to determine whether the problem exists since the initial installation of this equipment or has developed over time. This is related to factors such as the prestress from the connection between the foundation and the equipment, bearing damage, and the dynamic balance of the rotor. Especially regarding the dynamic balance issue, is it most likely that the vibration is caused by scale accumulation on the impeller? It is recommended to conduct a disassembly inspection; if scaling occurs on the impeller, it should be cleaned first, and a maintenance schedule for future use should be established. Scale removal methods include media-based removal, water flushing, and silty scale removal for reference.
The thrust is unstable during rotor operation; it is necessary to check the thrust ring, thrust bearings/shells, and other components related to thrust
Are there any other abnormalities besides the large axial vibration?
I’d like to recommend a new product to you: a magnetic levitation centrifugal blower. When the device is in operation, the shaft and impeller remain suspended in mid-air, resulting in no vibration or noise. Moreover, without bearings or gearboxes, the operating resistance is reduced; energy savings of 20% to 30% are typical. It requires no oil or water, and is also maintenance-free! Hurry and find me to exchange it! Now, rotary pumps are no longer used in sewage treatment plants~