Working Principle and Precautions for High-Temperature Centrifugal Fans

High-temperature centrifugal fans are fluid machinery that utilise input mechanical energy to elevate gas pressure and convey airflow.Through the fan's operation, air velocity and pressure energy increase from the propeller inlet to outlet. Gas discharged from the impeller passes through the compression chamber, where most kinetic energy is converted into static energy before being expelled via the discharge duct. At the impeller inlet, a vacuum or low-pressure zone is created by the expelled gas. Under atmospheric pressure, gas is drawn into this inlet and continues to be drawn in and expelled by the rotating impeller. High-temperature centrifugal fans typically comprise an impeller, casing, collector assembly, motor, and transmission components (such as the main shaft, belt, bearings, V-belt, etc.). The impeller comprises a disc, blades, hub, and shaft collar, while the casing consists of nested plates, side plates, and feet. Large high-temperature centrifugal fans connect to the motor via couplings or pulleys. Performance parameters for high-temperature centrifugal fans primarily include flow rate, pressure, output, efficiency, and speed. Additionally, noise and vibration constitute key technical indicators. Flow rate, also termed air volume, denotes the quantity of gas passing through the centrifugal fan per unit time. Pressure, referred to as air pressure, indicates the increase in gas pressure within the centrifugal fan, encompassing static pressure, dynamic pressure, and total pressure. Power signifies the input power to the centrifugal fan, specifically shaft power. The ratio of effective power to shaft power is termed efficiency, with total pressure efficiency potentially reaching 90%.