Below is an introduction to industrial centrifugal fans:

Working Principle

Industrial centrifugal fans operate on the principle of converting kinetic energy into potential energy. They use high-speed rotating impellers to accelerate gas, then decelerate and change its flow direction, transforming kinetic energy into potential energy to achieve gas transportation and pressurization.

Structural Components

- Casing: Made of steel plate, it can be integral or semi-open, with the semi-open type facilitating maintenance.

- Impeller: Composed of blades, a curved front disc, and a flat rear disc, it is the core component of the fan, determining its performance and efficiency.

- Rotor: Includes the impeller and main shaft, among other parts. It should undergo static and dynamic balancing to ensure smooth operation.

- Transmission Part: Consists of the main shaft, bearing housing, rolling bearings, and pulleys or couplings, used to transmit power.

Performance Characteristics

- Variable Flow Constant Pressure Device: When the speed is constant, the pressure-flow curve is theoretically a straight line. However, due to internal losses, the actual characteristic curve is curved.

- Pressure Affected by Inlet Conditions: The generated pressure is significantly influenced by changes in inlet temperature or density. For a given inlet flow rate, the pressure generated is lowest at the highest inlet temperature.

Application Areas

- Ventilation: Widely used in factories, mines, tunnels, buildings, and other locations to provide fresh air for personnel and equipment while expelling stale air and harmful gases.

- Industrial Furnaces and Kilns: Used for ventilation and induced draft in boilers and industrial furnaces to supply sufficient oxygen for combustion and improve combustion efficiency.

- Air Conditioning: Used in air conditioning equipment and household appliances for cooling and ventilation, maintaining a comfortable indoor temperature and humidity environment.

- Material Handling: Can be used for drying and conveying grains, among other applications, enabling pneumatic transportation of materials.

Selection Points

- Determine Flow Rate and Pressure: Calculate the required gas flow rate and pressure based on the needs of the actual usage scenario.

- Consider Medium Characteristics: Such as gas temperature, humidity, corrosiveness, dust content, etc., and select appropriate materials and structures.

- Focus on Efficiency and Energy Consumption: Choose high-efficiency and energy-saving fans to reduce operating costs.