This article's table of contents introduction:
- Decoding the Model Number: FBCDZ-6-No12
- What this fan is (The Full Name):
- Key Technical Characteristics & Applications
- Typical Performance Range (Estimated for No12)
- Advantages over other types (Single-stage or Vane-axial)
- Typical Applications
- Important Operational Note
Based on the designation you've provided, FBCDZ-6-No12, here is the breakdown of what this specific model of Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan is.
This is a specialized industrial fan designed for critical mine ventilation (exhaust) in underground coal mines. Let's decode the model number and then discuss its characteristics.
Decoding the Model Number: FBCDZ-6-No12
- F : Fan
- B : Explosion-Proof (防爆)
- C : Counter-rotating (对旋)
- D : Electric Motor Driven (电机驱动) - specifically, the impellers are mounted directly on the motor shafts.
- Z : Used for Mine Exhaust/Reed Mine (矿井主通风用 / 抽出式)
- 6 : Pole Number of the Motor. This indicates the motor speed. An 6-pole motor typically runs at a synchronous speed of ~980 RPM (at 50Hz) or ~1170 RPM (at 60Hz). This is a moderately slow speed, balancing high pressure with acceptable noise and wear.
- No12 : Fan Impeller Diameter. This means the diameter of the impeller is 1200 mm (1.2 meters) . This indicates a medium-to-large sized fan for main mine ventilation.
What this fan is (The Full Name):
FBCDZ-6-No12 = Flameproof, Explosion-Proof, Counter-Rotating, Direct-Drive, Main Exhaust Mine Axial Flow Fan (Model 6, Size 12)
Key Technical Characteristics & Applications
-
Counter-Rotating (C) :
- It has two impellers (rotors) that spin in opposite directions.
- Unlike a stator blade, the second impeller recovers the rotational energy from the first, generating very high pressure (up to 5000-6000 Pa) without needing a heavy, long diffuser. This is critical for overcoming the high resistance of long underground mine workings.
-
Explosion-Proof (B) :
- The fan casing, motors, and electrical connections are designed to contain any internal methane gas explosion. The motor is a YB-series flameproof motor.
- The fan blades are typically made of anti-static, non-sparking materials (like special cast aluminum alloy or fiber-reinforced plastic) to prevent sparks from impacting the casing.
-
Direct Drive (D) :
- No belts or gearboxes. The impellers are mounted directly on the motor shafts. This ensures zero transmission loss, high reliability, and very compact axial length.
-
Reversible Airflow (Z - 抽出式) :
- While the "Z" denotes exhaust (extraction), one of the key features of counter-rotating fans is that by reversing the rotation direction of the second motor (and sometimes the first), the fan can achieve efficient reverse airflow. Conventional axial fans lose 60-70% of airflow when reversed; these counter-rotating units can often achieve 80-90% of forward flow in reverse. This is vital for emergency ventilation direction changes in mines.
Typical Performance Range (Estimated for No12)
- Air Volume (Q) : ~ 2000 m³/min to 5000 m³/min (35 m³/s - 85 m³/s)
- Static Pressure (Pst) : ~ 1500 Pa to 4500 Pa (High)
- Motor Power (per motor) : Typically 2 x 55 kW or 2 x 75 kW (two identical flameproof motors, one for each impeller).
- Rated Voltage : Usually 380V, 660V, or 1140V (typical for Chinese mining equipment).
Advantages over other types (Single-stage or Vane-axial)
- Higher Efficiency at the design point (typically 80-85%).
- Smaller size for the same pressure generation (no long diffuser required).
- Wider stable operating range (the two impellers can be controlled independently in some advanced systems).
- Better reversing capability.
Typical Applications
- Main Mine Ventilator (MMV) for underground coal mines.
- Exhausting air from the return air shaft (containing methane, coal dust, and toxic gases).
- Used in tunnel ventilation for long railway/highway tunnels (non-explosion proof variant usually).
Important Operational Note
The "6" (pole) indicates a medium-speed fan. It is quieter and experiences less mechanical stress than a higher-speed (2-pole or 4-pole) fan, but it is heavier and larger. This model is chosen when the required pressure is not extremely high but steady, high-volume flow is needed with high safety requirements.
Safety Compliance: A fan with this naming convention must comply with MT 222-2007 (Chinese Coal Industry Standard) for flameproof mine fans, and typically uses YB2/ YBF2/ YBX4 series explosion-proof motors certified by CNEx (China National Explosion Protection).
WARNING: Due to the highly specific model number (FBCDZ-6-No12), this looks like a Chinese-manufactured standard (from suppliers like Shandong Kuangan, Shangdong Huadong, or Zibo Heilong). If you need replacement parts (blades, motors), you must verify the exact manufacturer and production year, as while the "standard" is uniform, the blade hub geometry and motor shaft connection specifics vary.
