Heavy-Duty Reversible Tunnel Axial Flow Ventilation Fan

Tunnel axial fans are primarily used for underground passage ventilation, suitable for railway tunnels, caverns, underground works, and buildings, serving as a high-pressure, low-noise, and high-efficiency axial flow fan.

The impeller hub adopts internationally advanced aluminum die-casting technology or a specially welded steel plate structure. Featuring symmetrical airfoil-shaped blades, it offers high efficiency, low noise, high structural strength, and long service life, with essentially identical performance parameters during forward and reverse rotation. All impellers undergo non-destructive inspection (including X-ray flaw detection) and mechanical property testing to ensure reliable quality and a sufficient safety factor for structural strength; under high-temperature operating conditions, corresponding high-temperature technical measures are applied to guarantee safe operation. Blades are fastened to the hub using high-strength bolts, making blade pitch angle adjustment extremely convenient for users to optimize according to operating conditions. The fan can be equipped with a bi-directional anti-surge device upon request to ensure safe and stable operation during sudden system resistance fluctuations. Designed with inlet guide vanes and stationary guide vanes, the fan features a compact structure that facilitates installation, maintenance, and inspection. The fan rotational direction can be switched between forward and reverse, completing the reversal sequence within 30 seconds (via reduced-voltage soft-start method, transitioning from forward rated speed to reverse rated speed).

Tunnel Axial Fan Performance Parameter Table (1)

Drawings and Tables of Tunnel Axial-Flow Fan Dimensions and Installation Specifications