The main faults and causes of the fan may occur during the operation of the fan. For the faults generated, the causes must be quickly identified and solved in time to prevent accidents.

Faults during fan operation and causes

Fault name Cause: The bearing box vibrates violently

1. The fan shaft is different from the motor shaft, and the coupling is installed askew.  

2. The casing or air inlet rubs with the impeller.  

3. The foundation stiffness is not enough or firm.  

4. Impeller rivet is loose or wheel disc is deformed.  

5. The impeller shaft disk and shaft are loose, and the coupling bolt is movable.  

6. The connection between casing and bracket, bearing box and bracket, bearing box and seat is loose.  

7. The air inlet and outlet pipes of the fan are poorly installed, causing vibration.  

8. The rotor is unbalanced. Bearing temperature rise is too high

1. The bearing box vibrates violently.  

2. The lubricating grease is poor in quality, deteriorated or overfilled, or contains dust, sand, dirt and other impurities.  

3. The tightening force of connecting bolts of bearing cover seat is too large or too small.  

4. The shaft and rolling bearing are installed askew, and the front and rear bearings are not concentric.  

5. The rolling bearing is damaged. Excessive motor current and temperature rise

1. The throttle valve in the air inlet pipe is not closed tightly when starting.  

2. The flow exceeds the specified value, or the air duct leaks.  

3. The gas density conveyed by the fan is too high.  

4. The input voltage of the motor is too low or the power supply is cut off individually.  

5. The coupling is improperly connected, the leather ring is too tight or the gap is uneven.  

6. Affected by the violent vibration of the bearing box.  

7. Affected by deterioration or failure of parallel fans. When the belt slides down, the two pulleys are not in the same plane with each other. Belt runout The distance between two pulleys is too close or the belt is too long.