Centrifugal fan is a commonly used air power equipment, its main function is to provide the power of air flow and realize the functions of ventilation, pressurization and exhaust by changing the air flow and pressure. The working principle of centrifugal fan is to utilize the centrifugal force generated by the high-speed rotating impeller to draw air in from the air inlet, and then accelerate the air and discharge it from the air outlet through the rotation of the impeller. Centrifugal fans are used in a wide range of applications, including ventilation, dust collection, air purification, industrial dust removal, paint spraying, substation facilities, coolers, biology, medicine and other fields. Centrifugal fans are widely used in construction, industrial production, air-conditioning systems, etc. They can transport large amounts of air or gas, regulate air flow and pressure, have a simple structure, are easy to use and have a high degree of reliability and operational stability.