Characteristics of Different Front Disc Configurations in High-Pressure Centrifugal Fan Impellers

Characteristics of Different Front Disc Configurations in High-Pressure Centrifugal Fan Impellers

It is well known that the impeller constitutes a vital component of high-pressure centrifugal fans. However, the shape of the impeller front plate varies depending on the specific type of high-pressure centrifugal fan. Currently, the front plates of high-pressure centrifugal fan impellers are categorised into three types: straight front plate, Konica front plate, and curved front plate. The following sections will provide detailed explanations of each front plate design for high-pressure centrifugal fans. In theory, this impeller design is unsuitable for gas flow trajectories. This is because the blade flow path at the outer diameter of the impeller is significantly larger than that at the inner diameter. Consequently, adopting this configuration leads to substantial variations in thermal velocity. Furthermore, as the airflow within the blade flow path cannot be adequately accommodated, the operational efficiency of the centrifugal fan diminishes. Nevertheless, this approach remains simple and convenient, and some fans still employ this front plate design. Secondly, the structure of high-pressure centrifugal fans is somewhat favourable. However, the cross-section of the runner between blades presents considerable issues. Leakage within the blade flow path also persists, contributing to the reduced efficiency of centrifugal fans. Manufacturing-wise, the overall design is relatively straightforward and convenient. Among current configurations, one form is particularly appropriate. This configuration ensures the duct airflow remains constant or decelerates with minimal leakage. Consequently, this type of high-pressure centrifugal fan achieves higher operational efficiency. Its drawbacks, however, include complex construction and elevated costs. Nevertheless, for mass production of high-pressure centrifugal fans, employing this front plate design offers distinct advantages. This overview details the front plate construction of high-pressure centrifugal fan blades. It is hoped that the preceding information enhances understanding of high-pressure centrifugal fans.