How to Prevent Failures in Backward-Curved Centrifugal Fans

How to Prevent Failures in Backward-Curved Centrifugal Fans

In the working media of backward-curved centrifugal fans—such as those used in dust removal systems and blowers for air transport—there are uniform particles of various sizes and shapes containing a certain amount of dust. Because these fans operate in airflow with high dust content, the dust particles not only cause wear on the fans but also accumulate on the fan blades, leading to uneven wear and dust buildup. Consequently, the balance of the backward-curved centrifugal fan’s rotor is compromised, leading to vibration and a shortened service life. In severe cases, the fan may fail to operate normally. In particular, severe wear on the blades not only compromises the fan’s flow characteristics but also increases the risk of major accidents such as blade failure and loss of control. Wear on transmission components is a common issue in back-inclined centrifugal fans, affecting various shafts, rollers, gearboxes, motors, pumps, and other parts—including bearing seats, keyways, and threads. Traditional repair methods, such as welding, often cause material damage, leading to component deformation and failure, which presents significant limitations. Rework methods such as electroplating and spray plating not only involve long repair cycles and high costs, but the repaired material remains metallic (which has poor impact resistance and low yield rates), so these tasks are often outsourced. This fails to address the root cause of wear. Since many parts can only be scrapped and replaced, manufacturing costs and spare parts inventory increase significantly, leading to a substantial rise in the company’s operating costs. Thanks to the wear resistance of ceramics, the service life of backward-curved centrifugal fans can be extended, allowing companies to save on scrap and replacement costs. During operation, if ceramic components become partially worn or detached, they can be filled and repaired on-site, ensuring the long-term use of backward-curved centrifugal fan impellers at low cost and in a short time.