This is a very useful question. Common centrifugal fan malfunctions mainly focus on vibration, abnormal noise, and performance degradation. The core malfunctions and their causes are as follows:
1. Abnormal Vibration (Most Common Fault)
Impeller imbalance, such as dust accumulation, wear, or blade damage causing a shift in the center of gravity.
Installation problems, such as loose anchor bolts, uneven base, or misalignment of the coupling.
Weared, damaged, or insufficiently lubricated bearings cause rotor eccentricity.
2. Abnormal Operating Noise
Friction between the impeller and the casing/inlet, often due to installation misalignment or component deformation.
Bearing malfunctions, such as worn balls or damaged cages, produce metallic friction sounds or abnormal noises.
Foreign objects entering the fan and colliding with the impeller produce impact sounds.
3. Insufficient Airflow/Pressure
Pipe blockage or leaks cause abnormal actual transport resistance or gas loss.
Severe impeller wear and corrosion, and changes in blade angle affect gas transport efficiency.
4. Low motor speed may be due to insufficient power supply voltage, inverter malfunction, or belt slippage.
5. Motor overheating
The fan is operating under overload conditions, exceeding rated parameters (e.g., excessive pipeline resistance).
Poor motor heat dissipation, or bearing lubrication failure leading to increased frictional resistance.
Abnormal power supply, such as unbalanced three-phase voltage or incorrect wiring.
6. Oil/air leakage
Aging or damaged bearing end cover seals cause lubricating oil leakage.
Loose flange connections or damaged gaskets cause gas leakage.
