The structural composition of ventilation fans varies significantly depending on the type and application. Below are the structural components of several major fan types:
General-purpose fans (such as small and medium-sized centrifugal or axial flow fans): These fans have a relatively simple structure. The main components include an impeller, casing, air inlet, support frame, motor, pulley, coupling, silencer, and transmission components (bearings). Their design emphasizes high efficiency, low noise, and long lifespan.
Blowers (including Roots blowers and rotary blowers): Blowers are typically used to transport air or gas. Their core structure includes a motor, air filter, blower body, air chamber, base (which also serves as an oil tank), and oil drip nozzle. The rotor assembly, consisting of a shaft, impeller, bearings, synchronizing gears, and coupling, is used to achieve forced gas transport. Wind turbine: As a device that converts wind energy into electrical energy, its structure is more complex, mainly including blades, hub, main shaft, gearbox, generator, yaw system, controller, tower, nacelle, anemometer, and wind vane. The blades capture wind energy, transmit torque through the hub and main shaft, and drive the generator to generate electricity after being accelerated by the gearbox. The yaw system ensures that the rotor is always facing the wind direction.
Centrifugal fan: Its working principle relies on the negative pressure created by the rotation of the impeller to draw in gas. The main structure consists of components such as casing, impeller, shaft, collector, exhaust port, bearing housing, coupling, pulley, and base.
Axial flow fan (such as the DWT-I roof axial flow fan): Suitable for roof ventilation, smoke extraction, and other scenarios, its structure includes core components such as impeller, duct, hood, transmission components, hinged dampers, bird netting, and safety netting. Some designs utilize fiberglass to reduce weight and enhance corrosion resistance.
Vortex blowers: These blowers use a high-speed rotating impeller to circulate and compress air along a spiral path, generating a high-pressure airflow. Their structural features include high-strength alloy blades and covers, a compact housing, and often a maintenance-free design, requiring only periodic bearing replacement.
