The centrifugal fan is different from other fans in that its working medium flows in axially of the fan and flows out radially, and needs to work under the action of centrifugal force. Vibration is inevitable for centrifugal fans. It refers to the maximum bidirectional amplitude of the fan bearing, which is required to not exceed 0.10mm.

Once the vibration of the centrifugal fan is too large, it will cause the motor current to be too high, the temperature rise is too high, and in severe cases, it will cause the motor coil to burn; and it will also have an adverse effect on the bearing anchor bolts, bearings, shafts and other components. There are three reasons for the excessive vibration of the centrifugal fan. One is the manufacturing quality of the fan; the second is the installation quality; and the third is the operation.
Centrifugal fan

In order to reduce the vibration of the centrifugal fan, we must first strictly abide by the correct installation process, including facility inventory and inspection; basic inspection, marking, shim and anchor bolt configuration. Then proceed with the installation of the centrifugal fan, paying attention to the smooth installation of the parts; after the completion of the installation, the facilities should be aligned.

Before the centrifugal fan is put into use, a comprehensive inspection is also required. The content involved includes the manufacturer’s manufacturing quality and whether there is damage and deformation during transportation, including the curvature of the shaft, which must not exceed 0.10mm; this aspect is due to conditions As a result, only the theodolite can be used for rough inspection on site.

At the same time, check whether the blade exit angle of the centrifugal fan impeller is consistent with the manufacturer’s drawing preset; and use a vernier caliper to check whether the clearance between the main shaft and the impeller meets the drawing preset; also check whether the thickness of the wind casing and the reinforcement ribs conform to the drawing preset. Finally, don’t forget to check whether the regulating gate and current collector are normal.