---by Xianrun Blower
|centrifugal fan main shaft|
1.1 Dust deposition
When air enters the impeller, and rotating blades surface have angle. According to the fluid mechanics principle, the non-working face of blade leaves a vortex, so dust will deposit
slowly under the effect of vortex. The rotating impeller will throw out a part of dust when the dust reaches a certain weight.
As a result, uneven dust in impeller blade causes impeller unbalanced, then make the fan over-standard vibration.
1.2 Duct system vibration
Smoke or air duct system vibration lead to centrifugal fan forced vibration. And the vibration usually cause fan outlet enlarge; the air volume increas; the vibration changes.
On the other hand, uneven incoming air area of fan inlet, such as not unified baffle opening and closing, can also cause impeller vibration.
|centrifugal blower in cement plant|
(1) the fan impeller and air inlet are not on the same axis.
(2) air inlet has damage and deformation.
(3) impeller looseness increases impeller waggle.
(4) bearing failure.
(5) the connection between shaft and bearing become loose.
(6) main shaft distortion.
|centrifugal fan in cement plant|