1. Overview and Core Operating Principle
Definition and Superior Performance
Centrifugal Fans are high-performance gas conveying devices engineered for superior pressure increase capability.
Operation Workflow
- The gas medium is drawn in along the motor shaft direction (Axially).
- It is accelerated by the high-speed rotating impeller.
- It is discharged centrifugally at a 90°deflection angle (Centrifugal Discharge).
Key Advantage: Compared to axial fans, LONGWELL centrifugal fans generate higher pressure and effectively overcome greater system pressure losses, making them ideal for high-resistance airflow systems.
2. Structure, Drive, and Impeller Technology
Core Components and Integrated Solutions
Fans typically consist of three main components: the drive motor, the impeller, and the inlet nozzle.
Integrated Components:
- Frequency Converter or EC Electronically Commutated Motor:Enables precise speed control and energy efficiency optimization.
EC Motor Advantages: Helps optimize airflow dynamics, significantly reduces operating noise, and greatly improves energy efficiency, ensuring long-term low operating costs.
Impeller Technology Comparison: Forward-curved vs. Backward-curved
Characteristic | Forward-curved Impeller | Backward-curved Impeller |
Casing Requirement | Requires spiral (scroll) casing for operation | Can operate with or without casing (Plug & Play Module) |
Volume Flow | Smaller volume flow rates | Larger volume flow rates |
Static Pressure | Lower static pressure | Higher static pressure (due to higher speeds) |
Control Method | Can be controlled via speed and motor current | Not suitable for control via motor current (requires nozzle pressure difference measurement) |
Installation Configurations and Core Advantages
Flexible Installation Configurations
Type | Description | Typical Application Scenario |
Cased Fans | Can have single or double inlets. Suitable for applications requiring precise duct connection, flexible connection to intake or pressure-side ducts. | Direct air supply systems, exhaust systems |
Free-running Fans | Air is freely drawn in and discharged into the air duct (plenum) to create pressure. Designed as a modular built-in fan. | Central air conditioning systems, large ventilation enclosures |
Installation Tip: Additional vibration dampers are recommended for base installation. For wall-mounted installation, an intake side plate connection can be used to ensure easy cleaning.
LONGWELL Centrifugal Fan Core Advantages
- High Pressure Increase and Efficiency:Achieves higher pressure and air volume than axial fans, ensuring continuously low operating costs.
- Safe Operating Range:Can be used across its entire characteristic curve, with no typical stall point, effectively preventing motor overload and ensuring reliable operation.
- Modularity and Easy Integration:Free-running fans are simple to install and can be flexibly assembled into Fan Walls, making them easy to retrofit into older systems.
Noise Control and Bionic Optimization
Noise primarily originates from airflow-related phenomena during operation, particularly the air vortices or turbulence generated by air deflection at the impeller blades.
Bionic Optimized Design (Low Noise, High Efficiency)
By incorporating bionic principles to optimize the impeller’s geometry, LONGWELL significantly improves flow conditions, reduces sound radiation, and enhances efficiency:
- Special Blade Edge Design:Such as leading edge axes or trailing edge serrations.
- Optimized blade surface structure.
- Precise blade contouring.
Typical Application Fields
LONGWELL centrifugal fans are particularly suited for applications requiring high pressure, such as when air must be transported through long ducts, complex filters, or air handling components.
- Ventilation and Air Conditioning Technology
- Data Center Cooling
- Drying Equipment
- Cleanroom Technology and Electronics Cooling
LONGWELL – Born for high-quality breathing | LONGWELL Fans Power Your Equipments.
