Installation Considerations for Multi-Blade Centrifugal Fan Units

The entire multi-blade centrifugal fan unit is typically installed by placing it directly on the foundation and leveling it using paired shims. If assembled on-site, appropriate protective measures must be implemented. Special attention should be given to protecting the cut surfaces on the fan base to prevent corrosion or damage. When placing the base on the foundation, leveling must be achieved using paired shims. Additionally, the bearing housing and base must be tightly fitted, ensuring longitudinal unevenness is strictly controlled within 0.2/1000. To meet this requirement, personnel should use a level for measurement while simultaneously controlling the horizontal non-levelness of the base within 0.3/1000. Subsequently, measurements should be taken on the horizontal dividing surface of the bearing housing using a level. Before scraping the bearing bushings, align the rotor shaft axis with the multi-wing centrifugal fan casing axis. Adjust the clearance between the impeller and inlet inlet, as well as the distance between the main shaft and the rear casing plate shaft hole, based on actual conditions to ensure compliance. It is important to note that during the assembly of the main shaft and bearing bushings, strict inspections must be conducted in accordance with relevant regulations. The interference between the bearing cover and the bearing bushing must be maintained between 0.03 and 0.04 mm. When assembling the multi-wing centrifugal fan casing, alignment should be based on the rotor shaft axis. The axial and radial clearances between the impeller inlet and the casing inlet should be adjusted to an appropriate range. This is primarily to further enhance the operational efficiency of the multi-wing centrifugal fan equipment. Additionally, during alignment, misalignment between the fan shaft and motor shaft should be maintained within appropriate limits: radial positioning movement for multi-wing centrifugal fans should not exceed 0.05 mm, and angular deviation should remain below 0.2/1000. How to Select Centrifugal Fans for Different Applications? Those familiar with fans generally understand that performance may vary when selecting centrifugal fan equipment based on different operational environments. For example, when selecting centrifugal fans for warehouses, key considerations during procurement include whether stored goods are flammable or explosive (e.g., paint storage). In such cases, explosion-proof centrifugal fans must be chosen. Naturally, operational noise levels must also be evaluated when selecting warehouse fans. Additionally, the required ventilation volume for warehouse airflow must be assessed to ensure appropriate fan equipment selection. Many users also seek solutions for kitchen exhaust requirements. For kitchens with indoor direct exhaust systems 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.