How to Repair Scratches on the Impeller of a High-Temperature Firefighting Axial Fan

How to Repair Scratches on the Impeller of a High-Temperature Firefighting Axial Fan

Generally speaking, using a high-temperature firefighting axial fan can damage the fan blades, and prolonged use can affect the machine’s performance. What should you do in this situation? Let’s take a look below. During the assembly of high-temperature fire-rated axial flow fan blades, if sharp metal tools cause scratches, these typically appear along the blade edges. The depth of the scratches exceeds 0.1 mm, and they run horizontally. In such cases, regardless of the on-site conditions, do not rush to start or stop the fan. Horizontal damage to high-temperature fire-fighting axial flow fan blades after operation can easily lead to horizontal cracks, so it is essential to address such damage promptly. If the blade is pulled upward from the tip by 1.5 to 4 meters, the probability of a horizontal crack exceeds 90%. If a notch is found on the blades of a high-temperature fire-fighting axial flow fan but left unrepaired, and the fan is installed and operated under emergency conditions, horizontal cracks will appear within a year. Lateral cracks in high-temperature fire-fighting axial flow fans continue to widen and expand due to bending, twisting, and natural vibrations. Under unexpected weather conditions, the blades may be damaged. Since the blade tips of high-temperature fire-fighting axial flow fans are thin, with low resistance to bending and weak resistance to natural vibrations, caution must be exercised during disassembly; the equipment should not be operated under adverse weather or other unfavorable conditions. If you are confident, it is necessary to resolve the issue. To ensure safe ground operations, what measures should be taken to address damage to high-temperature fire-fighting axial flow fans? A secondary cause is the high concentration of sand particles in the airflow, particularly large particles. The accumulation and abrasion of sand particles within the high-temperature fire-fighting axial flow fan cause severe damage, shortening the blades’ service life and altering the airflow angle. When high-temperature fire-fighting axial flow fans are used in areas with yellow sand, exposed units are damaged by sand particles. Under the same protective conditions, their service life will be shorter than in other regions. After 4 to 5 years of operation, to reinforce the base, the front end of the high-temperature fire-rated axial flow fan is thickened again. This method aims to prevent the entire front end of the high-temperature fire-rated axial flow fan from detaching by extending its resistance to erosion and abrasion caused by yellow sand. Repairing the cowl on the windward side is also not an effective method for addressing the inherent vibrations and cracks in the high-temperature fire-rated axial flow fan caused by the overall detachment resulting from the impact and abrasion of yellow sand. During routine maintenance, it is difficult to detect such issues through auditory or visual inspection alone due to human error. For wind farms in the Yukou area, taking advantage of periods of low power consumption, it is recommended to focus on verifying the upwind angle of the high-temperature fire-resistant axial flow fan and the position of the blade tips.