The basic principle of centrifugal fan operation is to drive the working wheel of the blades on the shaft to rotate through the motor, and the gas obtains centrifugal force with the rotation of the impeller. The gas is thrown out of the impeller and enters the shell, and the pressure inside the shell increases, causing the gas to be extruded through the guide outlet. After the gas is thrown out by the impeller, the pressure at the center of the impeller decreases, and the external gas is sucked in by the fan through the suction port. By repeatedly rotating the impeller, gas is constantly sucked out, thereby continuously delivering gas.

During this process, the impeller works for the gas, allowing it to gain energy and overcome the resistance of the flue to enter the boiler or discharge the boiler flue gas into the chimney. The structure of a centrifugal fan mainly includes components such as impeller, main shaft, bearings, housing, intake box, exhaust box, and transmission device. In terms of fan structure, the installation complexity of each component is high, and there are close connections between the components. If any component problems occur during the installation process, it will inevitably affect the safety and operational efficiency of the fan. Therefore, it is necessary to start with details and take measures for effective control.