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What is the cause of severe vibration of centrifugal fan?

What is the cause of the severe vibration of the centrifugal fan?
 
During the use of the centrifugal fan, if a violent sensation occurs, it will affect the normal use of the centrifugal fan, cause severe damage to the fan itself, and there are certain safety hazards. Therefore, it is necessary to deal with it in time, then, What are the reasons that caused the fan sensation?
 
The main reasons are as follows:
 
(1) The fan shaft and the motor shaft are not concentric;
 
(2) The fit between the disc hole of the impeller shaft and the shaft is loose;
 
(3) The bolts, rivets, etc. are loose, and the impeller may be deformed;
 
(4) Basically, perhaps the stiffness of the entire bracket is not good;
 
(5) The temperature of the conveying medium is too low, making the motor overloaded;
 
(6) The inlet and outlet pipes of the fan are not installed properly, showing resonance;
 
(7) The temperature rise of the bearing is too high, perhaps the bearing box presents a violent sensation;
 
(8) The quality of lubricating grease is not good enough, maybe there are impurities in it, or it has deteriorated;
 
(9) There is a conflict between the inner and outer rings of the rolling bearing, which may be tortuous or damaged;
 
(10) The casing or the air inlet conflicts with the impeller;
 
(11) The motor current is too large, perhaps the temperature rise is too high;
 
(12) When the fan is started, the regulating door or the gate in the pipeline is not tightly closed;
 
(13) The input voltage of the motor is too low, and the power supply presents a single-phase power failure;
 
(14) There is dust or dirt on the blade, or it is worn or deformed, and then the rotor becomes unbalanced;
 
(15) The performance of the system system does not match the performance of the fan, so that the fan is in a low pressure and large flow area and cannot operate well.
 
In view of the above 15 causes of violent sensation, it should be possible to find relevant measures to deal with and deal with. I hope this will help you.