What causes severe vibration in high-pressure direct-coupled centrifugal fans?

What causes severe vibration in high-pressure direct-coupled centrifugal fans?Severe vibration occurring during the operation of a high-pressure direct-coupled centrifugal fan may indicate an abnormal malfunction. If not addressed within the specified timeframe, it can not only cause significant damage to the fan itself but also lead to specific safety hazards. Therefore, such issues must be resolved promptly upon detection. So, what causes severe vibration in high-pressure direct-coupled centrifugal fans? In practice, complex on-site operating conditions may impact the operational state of the high-pressure direct-coupled centrifugal fan. The causes of abnormal vibration are as follows: 1. Misalignment between the centrifugal bearing and motor shaft. 2. Unstable foundation, resulting in insufficient overall support rigidity for the high-pressure direct-coupled centrifugal fan assembly. 3. Installation failure: Loose bolts or rivets in the high-pressure direct-coupled centrifugal fan assembly, or propeller deformation. 4. Loose fit between the propeller shaft bore and the shaft of the high-pressure direct-coupled centrifugal fan assembly. 5. Dust or debris on the high-pressure direct-coupled centrifugal fan blades, or wear/deformation causing rotor imbalance. 6. Improper installation of the inlet and outlet ducts of the high-pressure direct-drive centrifugal fan, leading to resonance. 7. Abnormal bearing temperature or severe vibration in the bearing housing of the high-pressure direct-drive centrifugal fan. 8. Inadequate quality of selected lubricating grease during operation, contamination with impurities, or grease degradation. 9. Friction between the housing or inlet of the high-pressure direct-coupled centrifugal fan assembly and the impeller. 10. Overcurrent in the motor or excessive temperature rise may be contributing factors. Additionally, if the system cannot match the performance of the high-pressure direct-coupled centrifugal fan, the fan may operate in a low-pressure, high-flow range and fail to function properly.