Hazards of Excessive Vibration in Centrifugal Fans and Vibration Reduction Measures

Unlike other types of fans, centrifugal fans operate with working media flowing axially into the fan and radially out, requiring operation under centrifugal force.

Vibration in centrifugal fans is unavoidable, defined as the maximum bidirectional amplitude of the fan bearings, which must not exceed 0.10mm. It also adversely affects components such as bearing anchor bolts, bearings, and shafts.

Three primary causes contribute to excessive vibration in centrifugal fans:

1. Fan manufacturing defects

2. Equipment quality issues

3. Operational factors

To mitigate centrifugal fan vibration, strict adherence to proper installation procedures is essential. This includes:

- Equipment inventory and inspection

- Verification of foundation alignment, reference lines, shims, and anchor bolt installation

Subsequently, inspect the centrifugal fan assembly, ensuring all components are installed level. Perform alignment after installation completion.

Prior to commissioning, conduct a comprehensive inspection covering:

- Manufacturer's production quality

- Damage or deformation during transportation

- Detailed shaft deflection measurement (not exceeding 0.10 mm). Note: Due to limitations, theodolites are only suitable for general on-site verification.

Verify that the outlet view of the centrifugal fan impeller blades matches the manufacturer's preset drawings. Use a vernier caliper to check whether the clearance between the main shaft and impeller meets the drawing specifications. Additionally, inspect whether the casing thickness and limit reinforcement comply with the drawing requirements. Finally, do not forget to check whether the air conditioning door and collector are functioning normally.