Features of multi-stage centrifugal fans

2025-07-30

Multi-stage centrifugal fans achieve pressure increase through the series operation of multiple impellers. Their main features revolve around 'high pressure head, stable performance, and wide adaptability'. Specifically:

1. Significant high-pressure head advantage, suitable for high-pressure scenarios:

- Step-by-step pressurization: By using multiple impellers (usually 2-12 stages) in series, gas pressure gradually increases after each stage, capable of generating wind pressure far higher than that of single-stage centrifugal fans (typically over 10 kPa, with some models exceeding 100 kPa). This is suitable for scenarios requiring high-pressure air supply or extraction, such as boiler draft, chemical gas conveyance, and high-pressure ventilation in mine shafts.

- Pressure stability: The coordinated work of multiple impellers results in more stable gas pressure output with minimal fluctuations, meeting the needs of processes requiring high pressure stability (such as gas conveyance in precise chemical reactions).

2. Controllable flow characteristics, flexible adjustment methods:

- Good match between flow and pressure: Under design conditions, the flow remains relatively stable, and can be adjusted by changing the speed, inlet guide vanes, etc., to meet different flow demands under various operating conditions, with a smaller decrease in efficiency during adjustment.

- Suitable for low flow high-pressure scenarios: Compared to axial fans, they are more suitable for 'low flow, high wind pressure' scenarios. When conveying gas with small flow but needing to overcome significant resistance (such as long-distance pipeline ventilation), they demonstrate higher efficiency.

3. Compact structural design, strong operational reliability:

- Compact layout: Multiple impellers are installed on the same axis, resulting in a compact overall structure with a smaller footprint, suitable for places with limited installation space.

- High durability of components: Core components such as impellers and casing often use high-strength steel, and models exposed to corrosive gases undergo anti-corrosion treatment (such as spraying, lining rubber), with a mature transmission system design, minimal vibration, low noise during operation, strong continuous working stability, and longer service life.