The centrifugal impeller is a critical component of the centrifugal fan, and only through static balance or rotor dynamic balance verification can the fan’s stable operation be ensured. Depending on the direction of the blades’ entry and exit, centrifugal impellers are categorized into forward, axial, and backward types. The axial centrifugal impeller’s blade tip axis is inclined towards the rotation direction of the fan in forward centrifugal impellers, while backward centrifugal impellers have blades inclined in the opposite direction to the rotation.

In daily life, centrifugal fans play an essential role in ventilation and air exchange, having a significant practical impact on production, manufacturing, and daily living. They are indispensable components that cannot be overlooked. Generally, the main components of a centrifugal fan include the impeller and the casing. These components come in various configurations and sizes, but the basic principles are similar.

After being in use for a period, most equipment requires inspection and cleaning. Cleaning can be inconvenient, but inspecting and cleaning centrifugal fans is relatively easy. Some models are equipped with access doors, allowing inspection without disassembly, saving time and effort.

Centrifugal fans are naturally efficient in ventilation, making them particularly suitable for ducted exhaust and ventilation applications. Moreover, the impeller of a centrifugal fan is effectively designed to be backward-leaning, which results in minimal friction during operation, low noise, and reduced dust adhesion, making maintenance quite convenient. The surface coating of centrifugal fans provides strong oxidation resistance, and the fan casing has excellent corrosion resistance, especially in environments with high gas exposure.

Centrifugal fans can operate in both left-hand and right-hand rotational directions, with counterclockwise rotation referred to as left-handed centrifugal fans. Small to medium-sized centrifugal fans typically function as constant flow devices with adjustable total flow. Changes in inlet temperature or relative density can significantly impact the working pressure of a centrifugal fan. For a given working pressure and total flow characteristic curve, the fan’s output power and total flow characteristic curve are defined. When the fan motor operates at a fixed frequency, the inlet temperature may need to be reduced for optimal performance.