This article's table of contents introduction:
- Model Number Breakdown: FBCDZ-6-No20
- Core Technical Features
- Primary Application
- Performance Characteristics (General Estimate)
- Critical Safety & Operational Features
- Summary for Procurement or Maintenance
This is a highly specific and technical product designation. Let’s break down what FBCDZ-6-No20 means in the context of a coal mine exhaust fan.
The full name describes a Main Ventilation Fan (MVF) designed for the most hazardous underground environments.
Here is the detailed technical breakdown of the model:
Model Number Breakdown: FBCDZ-6-No20
- F: Fan
- B: Explosion-Proof (防爆)
- C: Counter-Rotating (对旋)
- D: Motor directly connected to the impeller (电机对旋). This means the motor is inside the fan housing, not driven by belts.
- Z: Axial Flow (轴流)
- 6: This represents the Pole Number of the Motor. A 6-pole motor typically runs at a lower speed (~980 RPM at 50Hz) compared to 2-pole or 4-pole motors.
- No20: This indicates the Impeller Diameter in decimeters. No20 = 20 dm = 2000 mm (2.0 meters) .
Core Technical Features
- Counter-Rotating (C): This fan has two sets of impellers (blades) rotating in opposite directions. Unlike a single-stage fan, there are no stationary guide vanes between the stages.
- Benefit: Higher efficiency, higher pressure, and a more compact design than a traditional single-stage axial fan of the same diameter.
- Explosion-Proof (B) & Exhaust: This is the most critical feature.
- The fan is designed to be installed in a fresh air location (usually on the surface), but it is ducted to pull "exhaust" air (containing methane, coal dust, and other fumes) out of the mine.
- The motor, wiring, and housing are built to explosion-proof standards (e.g., Ex d I Mb) . This prevents any spark from inside the fan from igniting the methane gas that may be present in the exhausted air stream.
- Direct Drive (D): The motor shaft is the fan shaft. This eliminates belts, pulleys, and bearings that can fail and cause sparks. It also reduces maintenance.
Primary Application
This specific fan is used as a Main Mine Exhaust Fan (Main Ventilator) . It is responsible for creating negative pressure in the mine, forcing fresh air down the intake shaft and pulling stale, potentially explosive air out of the exhaust shaft.
Because it is No20 (2-meter diameter), it is a medium-to-large capacity fan. It would be suitable for a medium-sized coal mine or as a secondary main fan in a larger mine.
Performance Characteristics (General Estimate)
While exact curves depend on blade angle, motor power, and supplier (e.g., Shandong, Henan), you can expect:
- Air Volume (Q): ~25 m³/s to ~80 m³/s (90,000 to 288,000 m³/h).
- Static Pressure (P): ~1,000 Pa to ~3,500 Pa (depending on mine resistance).
- Motor Power: Typically 2x 37kW to 2x 75kW (two motors, one for each impeller stage). The "6" pole motor means it runs slower, making it quieter and more robust for continuous duty, but with slightly lower pressure capability than a 4-pole version.
- Efficiency: High-efficiency zone (often >80%) due to the counter-rotating design.
Critical Safety & Operational Features
- Reversing Airflow: A key requirement for mine fans. This model likely uses a hydraulic or electric mechanism to reverse the blades (blade pitch reversal) or the motors reverse rotation. This allows the fan to reverse the airflow direction (from exhaust to intake) quickly in an emergency without moving the massive fan housing.
- Dual System: In a mine, this is usually one of two identical fans (a "Main" and a "Standby"). If this fan stops, the dampers close, and the standby fan starts automatically to prevent loss of mine ventilation.
- Monitoring: It is connected to a central monitoring station that tracks:
- Vibration (bearing health)
- Motor temperature (stator RTDs)
- Airflow velocity
- Gas concentration (Methane, CO) at the fan outlet.
Summary for Procurement or Maintenance
If you are dealing with a FBCDZ-6-No20, you are looking at a two-stage, direct-drive, 2-meter diameter explosion-proof axial fan used for the primary exhaust ventilation of a coal mine. You need to know:
- Motor Power (kW): Check the nameplate (e.g., 2x55kW).
- Blade Angle: The operational point (pressure/flow) is set by adjusting the angle of the blades (pitch).
- Voltage: Typically 380V, 660V, 1140V, or 6kV/10kV.
- Manufacturer: Key Chinese manufacturers include Shandong Goodeng, Shandong Huadong, Hengfeng, Zibo Yonghong.
Bottom Line: This is a serious, high-capex piece of industrial safety equipment. It is not a simple fan; it is a life-safety system engineered to prevent catastrophic gas explosions in underground coal mines.
