Why the centrifugal blower vibrates violently

During the use of centrifugal fan, if the vibration is severe, it is very bad, because it will affect the normal use of the fan, cause serious damage to the fan itself, and also have a certain safety risk. Therefore, timely treatment, timely treatment, then what is the reason for the strong vibration of the fan? The following is the analysis.

The main causes of strong vibration of fan are as follows:

(1) Fan shaft and motor shaft are not concentric;

(2) Insufficient rigidity of foundation or overall support;

(3) Loose bolts and rivets or deformed impeller;

(4) Loose fit between impeller shaft disk hole and shaft;

(5) There is dust or dirt on the blade, or the blade is worn or deformed, which makes the rotor unbalanced;

(6) The inlet and outlet pipes of the fan are improperly installed, causing resonance;

(7) The temperature rise of bearing is too high, or the vibration of bearing box is strong;

(8) The lubricating grease is unqualified, mixed with impurities or deteriorated;

(9) Friction, bending and damage between inner and outer rings of rolling bearing;

(10) Friction between the casing or air inlet and the impeller;

(11) Motor current is too high or temperature rise is too high;

(12) When the fan is started, the regulating valve or the gate in the air outlet pipe is not closed;

(13) The motor input voltage is too low, and the single-phase power supply is cut off;

(14) The temperature of the transport medium is too low, resulting in overload operation of the motor;

(15) The system can not match the performance of the fan, so that the fan is in the area of low pressure and large flow, and the operation is poor.