Analysis of main causes of vibration failures of centrifugal fans and effective treatment methods
Due to the poor operating conditions and high failure rate, the centrifugal fan can cause unplanned outage or load reduction operation of the unit, which will affect normal production. Therefore, it is very important to strengthen the maintenance and maintenance of the centrifugal fan, especially to quickly judge the causes of the fault in the operation of the centrifugal fan, and take the necessary measures.
Centrifugal fan vibration is a common phenomenon in operation. As long as it is within the scope of vibration control, it will not cause too much impact. But after the centrifugal fan's vibration exceeds the standard, it will cause the damage of the bearing seat or motor bearing, the loosening of the anchor bolt of the motor, the casing of the centrifugal fan, the damage of the blade and air duct, the burning of the motor and so on, which can reduce the performance of the centrifugal fan, and even lead to the failure of the work. Serious accidents may be caused by vibration, which may endanger people's health and working environment. The company has caused large economic losses to the company because of the large vibration of centrifugal fan, the friction between the impeller and the shell, and the accident caused by the ignition of the equipment.
Therefore, to find out the reasons for the excessive vibration of the centrifugal fan, and to take appropriate measures to analyze the reasons for different phenomena, often can make the result twice the result with half the effort. The vibration of centrifugal fan is measured by the vibration meter for a long time, and the data are recorded. The vibration causes of the centrifugal fan are summarized as follows, and the corresponding treatment measures are put forward.
Vibration of bearing box of centrifugal fan
The most common fault of centrifugal fan is the vibration of bearing box, which can be preliminarily diagnosed by external detection. The vibration caused by bearing box vibration can be observed. It is a process of small vibration and slow occurrence. The vibration value of the bearing box of the centrifugal fan is tested regularly by the vibration meter, and the vibration value is compared, the correct analysis and processing are made quickly, and the centrifugal fan with the possibility of failure is planned in advance, and the safe and stable operation of the centrifugal fan is ensured.
轉子不平衡引起的振動的特征，用測振儀測得數據顯示：(1) 振動值徑向較大，而軸向較??；(2) 振動值隨轉速上升而增大。
Vibration caused by mass imbalances of 1. rotor
The vibration of the centrifugal fan bearing box is mostly caused by the unbalanced quality of the rotor system. The main reasons for the uneven rotor quality are: uneven wear or corrosion of the impeller; unevenly distributed ash or attachments on the surface of the impeller; unbalance of the impeller after welding; the loosening of the parts on the impeller or the unfastening of the connecting parts.
The vibration characteristic caused by the rotor unbalance, the data measured by the vibration meter show that (1) the vibration value is larger in radial direction and smaller in the axial direction; (2) the vibration value increases with the speed.