Precautions for Operating Centrifugal Fan Units

When installing centrifugal fan air chassis equipment, pay attention to the following five aspects to enhance equipment performance and quality:

- The cut surfaces on the chassis base of field-assembled centrifugal fan air chassis must be properly protected against corrosion or damage.

- When placing the chassis on a level foundation, use a pair of shims to ensure the base is level.

The bearing housing must be tightly fitted to the base. Longitudinal levelness deviation should not exceed 0.2 mm/1000 mm, while horizontal levelness deviation should not exceed 0.3 mm/1000 mm. Measurements for horizontal levelness should be taken on the bearing housing's horizontal reference plane.

Prior to installation, compare the rotor shaft axis with the casing axis. Adjust the clearance between the impeller and inlet, as well as between the casing main shaft and rear plate shaft hole, to the specified distance per equipment technical documentation. During main shaft and bearing assembly, inspect according to equipment technical documentation. The interference between the bearing cover and bearing pad should be 0.03 ≤ 0.04 mm (measured between the bearing outer diameter and bearing housing inner diameter).

When installing centrifugal fan units, the casing orientation should be determined based on the rotor shaft axis. The axial and radial clearance between the impeller inlet and casing inlet must remain within the range specified in the equipment technical documentation. Simultaneously, verify that all anchor bolts are securely fastened. If equipment and technical documentation are non-standard, the axial clearance should be 1.0–1.5 times the impeller outer diameter, while the radial clearance should be uniformly distributed with values ranging from 1.5–3.0 times the impeller outer diameter (using the larger value for smaller outer diameters). During adjustment, minimize air and ground values to enhance the centrifugal fan's efficiency.