​How is a cabinet-type fire centrifugal fan installed?

How is a cabinet-type fire centrifugal fan installed?

The installation and alignment of cabinet-type fire centrifugal fans vary in scope and requirements based on the precision specifications, drive method, rotational speed, and power output of each specific model. Therefore, it is crucial to install and align cabinet-type fire centrifugal fans according to their distinct requirements. Clean the concrete foundation surface and inspect its levelness. If it does not meet specifications, level the uneven sections. Place the cabinet-type fire centrifugal fan base on the foundation. Insert shims between the foundation surface and the base surface to allow mortar flow during drying. Adjust the levelness using shims to ensure the fan base is absolutely level. When installing standard cabinet-type fire centrifugal fans, rectangular shims (steel plates) of varying thicknesses can be prepared and stacked for adjustment. For coupling-driven cabinet-type fire centrifugal fans, the coupling can be used for alignment checks; after adjustment, weld it securely in place. Insert shims on both sides of the anchor bolts. Adjustment bolts are also used during leveling. Anchor bolts passing through the base's anchor bolt holes must be perpendicular to the square holes in the anchor bolts. Gaps between the anchor bolt holes and the foundation concrete must be filled with sufficient mortar to ensure the structural integrity of the concrete. When installing cabinet-type fire centrifugal fans with critical or high-precision requirements, first pour mortar into the anchor bolt embedment holes. After the mortar fully cures, realign and adjust to level. After meeting installation accuracy requirements, pour mortar into the gaps between the foundation and foundation bar concrete. Once the mortar fully cures, tighten the anchor bolt nuts. Throughout the entire installation process of cabinet-type fire centrifugal fans, the grouting procedure is critical. It not only fills the space between the foundation and foundation concrete but also significantly impacts load transfer and mechanical stiffness support for the fan. Therefore, special attention must be paid to grout shrinkage and cracking during construction, employing appropriate methods. Generally, large cabinet-type fire centrifugal fans feature separate housings and bases. For split-type cabinet-style fire centrifugal fans, the casing is divided into several sections. During installation, first install the fan base and bearing housing as described above. Then, align the stator and rotor by assembling the lower casing, rotor, and upper casing in sequence, as shown in Figure 3-1a. When installing critical cabinet-style fire centrifugal fans, which require high leveling precision, adjust using upper and lower shims. Before assembly, inspect all mating surfaces for burrs, rolled edges, deformation, or other defects. During assembly, maintain cleanliness of ground surfaces to prevent damage. When assembling the casing, avoid contact with the rotor and do not apply additional loads to the rotor. In certain situations where adequate foundation installation is impractical, cabinet-type fire centrifugal fans are often mounted on vibration isolators to reduce transmitted vibration forces. Mounting brackets should be centered on the fan's mass center to ensure uniform compression across all brackets. While this installation method reduces vibration transmission to the foundation, it increases vibration within the fan itself. Therefore, flexible fabric or rubber connectors must be used when connecting the fan's inlet/outlet to ductwork. In buildings, cabinet-type fire centrifugal fans are sometimes suspended from ceilings. Except for very small units that can be mounted using hanging brackets, prioritize welded frames integrated with ceiling foundations.