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Working Principle & Technical Specifications

The tunnel jet fan operates by generating a high-velocity air stream (outlet velocity: 19.1-42 m/s), which propels the tunnel air along its axis to create a longitudinal ventilation flow. Its core feature is a counter-rotating dual-motor system, utilizing two-stage impellers to accelerate gas expulsion. Key performance parameters include:

Performance Range:

• Air Volume: 56 - 1355 m³/min (covers ventilation needs from short tunnels to distances up to 2000m).

• Total Pressure: 172 - 8600 Pa (adapts to various ventilation resistance scenarios).

• High-Temperature Resistance: Capable of continuous operation for 2 hours in 280°C environments (a critical index for fire smoke extraction).

Technical Features:

• Bi-Directional Operation: Electronic/mechanical forward-reverse switching within 30 seconds, with reverse airflow ≥ 98% of forward flow.

• Noise Reduction: Double-layer silencer structure (1D/2D impeller diameter), ensuring noise level ≤ 77 dB(A) at 10 meters.

• Construction: Aluminum alloy impeller with hot-dip galvanized casing, featuring corrosion resistance rating of IP55.

Application Scenarios

Core Functions:

• Daily Ventilation: Removes exhaust fumes (CO, NOx) and dust from internal combustion engines, maintaining air quality.

• Emergency Smoke Extraction: Rapidly switches to smoke exhaust mode during fires, achieving 4 complete air changes within 15 minutes.

Engineering Adaptability:

• Mounting: Suspended installation on the tunnel ceiling or sides, requiring no traffic space and saving ductwork costs.

• Ideal Applications: Railway tunnels (mandatory mechanical ventilation for lengths ≥ 2km), subways, and highway tunnels.