The basic structure of a DC centrifugal fan includes the following main parts, each playing a crucial role in ensuring the fan operates efficiently and stably:
Impeller: The impeller is the most critical part of the fan. It is responsible for drawing in air and expelling the airflow through centrifugal force. DC centrifugal fans often use a backward-curved impeller design, which minimizes airflow resistance and provides higher air pressure and better airflow efficiency.
Casing: The casing serves as the external protective structure of the fan, supporting and protecting the internal components. The casing design usually focuses on a streamlined structure to reduce airflow turbulence and losses, thereby improving the overall efficiency of the fan.
Inlet: The inlet guides air into the fan. A streamlined design helps reduce airflow losses and ensures smooth airflow into the fan impeller.
Motor (Outer Rotor Brushless DC Motor): DC centrifugal fans use an outer rotor brushless DC motor, which features high efficiency, long lifespan, and low power consumption. The motor uses grease-lubricated ball bearings, ensuring smooth operation and reducing mechanical wear.
Transmission System: The transmission system connects the motor to the impeller, driving the impeller's rotation. Its design is typically simple and reliable, ensuring efficient power transmission.
Bracket: The bracket is used to fix the various parts of the fan, ensuring stable installation and preventing vibration or instability during operation.