Assembly and Alignment of Centrifugal Fans

When assembling centrifugal corrosion-resistant fan equipment, certain requirements must be met to ensure smooth completion of the assembly process. First, count the number of shims at each support point on the base plate and arrange them in the correct positions to avoid confusion. If parts lack markings, add identifiers for recognition. Additionally, regarding the installation of the centrifugal corrosion-resistant fan's partition and sealing sections, remember to leave a vertical thermal expansion gap of approximately 0.05-0.15 mm after placing the lower partition into the casing, while maintaining concentricity with the rotor. For seal installation, ensure the sealing teeth face the high-pressure side. Before installing the centrifugal fan bearings, conduct a preliminary inspection. The primary purpose is to verify the contact area between the bearing bush backing surface and the bearing housing bore. Typically, the contact area should not be less than 75%. The bearing bush should be slightly tight horizontally, with clearance vertically relative to the gland. Additionally, simultaneously inspect the contact between the rotor, bracket, and thrust bearing. Generally, contact should be uniform with an angle around 60 degrees. Note that when checking thrust bearing contact, measure the total axial clearance of the thrust bearing using the shaft surface gauge of the centrifugal corrosion-resistant fan. After inspection and installation, verify the clearance between critical sealing components in the centrifugal corrosion-resistant fan. Typically, four sections are measured both horizontally and vertically. Horizontal gaps are typically measured with a straightedge, while vertical gaps require wire gauges. Before final installation, the centrifugal corrosion-resistant fan must undergo alignment. When aligning the unit, the upper stator and bearing housing cover must be installed first to prevent misalignment caused by the fan's self-weight.