Mining Contra-Rotating Fans
Contra-rotating auxiliary fans for underground coal & hard-rock mines — two direct-driven impellers in one casing, no inter-stage ducting.
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Prototype Specification (M4G200)
| Casing Ø | 630 mm |
| Impellers | 7 + 6 blades, contra-rotating |
| Speed | ± 2930 rpm (2 × direct drive) |
| Flow | 7.5 m³/s |
| Pressure | ≈ 3400 Pa |
| Power | 2 × 18.5 kW |
| Impeller construction | welded Q345 steel / cast aluminium 6061 / A356 |
| Sparks protection | brass anti-spark rings (Ex) — aluminium version press-fit, steel version removable |
| Chassis | rail-wheel trolley for 600 mm underground track (optional) |
Two Impeller Options
Certification
MA (China mining safety) and Ex certification in progress — positioned against FBD-series machines. For overseas mines, no MA is required: we supply to your local standard.
Why contra-rotating?
- High pressure in a short package — no inter-stage ducting
- Two motors share the load — redundancy & lower single-motor size
- CFD-developed impeller geometry (7+6 blades, synced reinforcement)
Engineering-Verified Design
Geometry developed in CFD, structure verified by FEA before any metal is cut.
Talk to our mining engineers
Tell us your mine duty — required flow, duct Ø and gas class. We match a machine and quote in 48 h.
Contact Mining Team