南之机械 | 隧道通风技术
The two-stage counter-rotating fan is the most widely adopted standardized ventilation equipment in global tunnel construction. Featuring integrated factory assembly, stable aerodynamic performance and outstanding cost performance, it has become the mainstream solution for medium-short distance and large-section conventional tunnel ventilation projects.
Structural Characteristics
The counter-rotating fan adopts an integrated fixed structure with two sets of reverse rotating impellers and no intermediate guide vanes. The whole machine is fully assembled, calibrated and tested in the factory, requiring no secondary splicing on site. Independent single-stage motor control allows flexible adjustment to match variable ventilation demands at different construction stages.
Core Product Advantages
1. Fast On-Site Installation and Commissioning
As a fully standardized mass-produced product, the counter-rotating fan features mature production technology and highly universal spare parts. After delivery, the fan can be quickly put into service through simple positioning, fixing and pipeline connection, minimizing on-site commissioning time and adapting to fast-paced tunnel construction.
2. Stable Performance for Large-Section Tunneling
Precise factory calibration ensures stable axial air supply and low failure rate during long-term continuous operation. The dual-impeller coupling structure delivers steady airflow output, fully meeting fresh air supply and dust exhaustion requirements for various large-section tunnel excavation scenarios.
3. Excellent Cost Performance with Low Investment
Standardized mass production effectively lowers manufacturing and procurement costs. The fan features low purchase price and simple daily maintenance. Equipped with a complete variable-frequency control system, it realizes adjustable air volume and energy-saving operation, achieving high economic benefits for conventional tunnel projects.
Technical Limitations
The fixed two-stage structure cannot be expanded on-site, resulting in a constant wind pressure limit. When facing ultra-long distance or high-resistance tunnels, the fan is prone to insufficient pressure and obvious air volume attenuation. Without intermediate guide vane rectification, mutual airflow interference exists between the two impeller stages, leading to reduced efficiency under off-rated working conditions. High aerodynamic coupling between two stages also results in low fault tolerance, as single-stage failure will disable the entire ventilation system.
适用场景
It is highly suitable for conventional tunnels within 2500 meters, large-section tunnels and general medium and short-distance tunneling projects, serving as a mature, stable and cost-effective standard ventilation solution.
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