Local Ventilation Fan
Overview
The local ventilation fan is an explosion-proof ventilation device specifically designed for underground mining tunneling faces. Its core functions are to deliver fresh air and remove hazardous gases (e.g., methane), ensuring worker safety and uninterrupted operations. The product features a rotary axial-flow aerodynamic design, explosion-proof motor and an effective silencing system. It operates reliably in harsh conditions from -20°C to +40°C and relative humidity up to 95%, is easy to move and maintain, and is well-suited for most short-to-medium distance tunneling faces.
Key Points
High explosion-proof rating and robust explosion-proof enclosure
Multiple airflow types available: axial flow fan / centrifugal fan / mixed-flow fan
Wide operating temperature: -20°C ~ +40°C; humidity tolerant (≤95%)
Sound-damping and anti-vibration design for lower noise and better working conditions
Portable and quick to deploy at tunneling faces
Sensor interfaces for current/gas monitoring, support for interlock shutdown and optional remote monitoring
Classification
by Structural Type
Push (Pressure) type: Fresh air is pushed from the tunnel entrance into the working face. This improves the working environment and provides better labor conditions.
Pull (Exhaust) type: Directly extracts polluted air from the working face. Effective exhaust but short effective suction distance — requires precise placement of ducts and curtains.
Installation & Operation
Receipt inspection: Check enclosure integrity, duct connections, grounding point and accompanying certificates.
Positioning & installation: Ensure duct/curtain is securely connected, base is stable and cables are wired per explosion-proof regulations.
Pre-start checks: Verify explosion-proof enclosure has no cracks, sensors and interlocks function, silencer is unobstructed.
Trial run: Run unloaded for 1–3 minutes while monitoring current and vibration; proceed to load only after confirming normal operation.
Shutdown: Remove load before cutting power to prevent reverse rotation or surge airflow.
Maintenance & Servicing
Pre-start checks (every shift)
Confirm explosion-proof enclosure and fastening; check duct seals; verify current/voltage readings; ensure hazardous-gas detectors operational.
Operational monitoring (real-time)
Monitor current/voltage, vibration and gas concentrations; if abnormal, stop and inspect, and record operating conditions.
Scheduled maintenance
Quarterly: clean silencer, clean enclosure, inspect duct seals.
Semi-annually: inspect impeller wear, check coupling/fasteners.
Annually: full performance test — airflow, static pressure, insulation resistance, explosion-proof integrity.
Recommended spare parts: seals, silencer inserts, impeller bolts, fuses for explosion-proof motor, control relays.
FAQs
Q:How do I choose between axial, centrifugal, and mixed-flow fans?
A: Choose axial for large airflow and low/medium resistance (short/medium runs).
Choose centrifugal for high static pressure (long runs, high resistance).
Choose mixed-flow when you need a balance of airflow and pressure for complex or mixed-resistance tunnels.
Q: What does “axial flow fan” mean?
A: An axial flow fan moves air parallel to the fan shaft. It delivers high airflow at moderate pressure and is ideal for short-to-medium distance ventilation.
Q: What are the operating environmental limits?
A:Designed to operate in typical underground conditions: -20°C to +40°C and up to 95% relative humidity. Verify model specifications for extreme conditions.