This article's table of contents introduction:
Based on the model designation you provided, here is a detailed breakdown of the FBCDZ-6-No14 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan.
This is a very specific and heavy-duty industrial fan used primarily for mine ventilation.
Model Breakdown (FBCDZ-6-No14)
F - Fan
B - Explosion-Proof (防爆) - The motor and components are designed to prevent sparks from igniting methane or coal dust in the mine.
C - Counter-rotating (对旋) - The fan has two impellers that rotate in opposite directions on the same axis.
DZ - Axial Flow (轴流) - Air flows parallel to the fan's shaft.
-6 - Motor Poles - The motor has 6 poles. This gives a synchronous speed of approximately 980 RPM (on a 50Hz system, e.g., in China/Europe) or ~1160 RPM (on a 60Hz system).
Note: This is a slow-speed motor, which is advantageous for reducing noise and wear in continuous-duty mine ventilation.
-No14 - Fan Diameter - The impeller diameter is 1400 mm (1.4 meters or ~55 inches).
Key Technical Specifications (General for this Class)
Type: Counter-rotating axial flow
Application: Main mine exhaust ventilation (抽出式通风)
Airflow Range (Q): Typically 50 to 150 m³/s (depending on blade angle and system resistance)
Static Pressure (P): Typically 1,500 to 4,500 Pa (high pressure for mine networks)
Motor Power: Usually 2 × 110 kW to 2 × 160 kW (Twin motors, one for each impeller; total power ~220kW to 320kW)
Efficiency: Designed for high static efficiency (≥75-80%)
Blade Material: Usually high-strength aluminum alloy or composite materials (to reduce weight & prevent sparks).
Noise: Typically ≤ 85 dB(A) (with silencer installed).
Design Features
Counter-Rotating Technology (Twin Impellers):
The first impeller spins clockwise, the second counter-clockwise.
This eliminates the need for stator vanes (guide vanes), which reduces the fan's overall length and weight.
It provides higher pressure than a single-stage axial fan, making it suitable for deep or long-wall mines.
If one impeller fails, the other can run at a lower pressure (emergency operation).
Explosion-Proof (Ex) Construction:
Motor: Explosion-proof motor (Ex d or Ex e) certified for coal mines (e.g., China's Ex d I Mb standard). The motor is high-efficiency (IE3 or IE4 class).
Casing: Robust steel casing to contain any internal explosion.
Blades: Non-sparking materials (aluminum or composite) to prevent frictional sparks with the casing.
Direct Drive:
The impellers are mounted directly on the motor shafts. No belts or couplings are used. This eliminates transmission losses and reduces maintenance.
Reversible Operation:
By changing the rotation direction (via reversing switch), the airflow direction can be reversed. In reversible mode, the second impeller (formerly the rear) becomes the front, still providing counter-rotating action. However, performance in reverse is typically 60-70% of forward.
Variable Pitch Blades:
The blade angle can be adjusted (while stationary) to change the fan's performance curve to match the mine's ventilation demand. This is known as "pitch angle" (e.g., 35°, 40°, 45°).
Application in Coal Mining
Exhaust Fan: This fan is designed to be installed at the mine exhaust shaft (return air shaft). It draws stale, methane-laden air out of the mine.
Main Fan: It acts as the primary ventilation source, ensuring a safe airflow across the working faces.
Emergency Backup: For critical mine safety, such fans are often installed in pairs (one running, one standby) or with a dedicated backup power source.
Manufacturer / Code Context (FBCDZ)
FBCDZ is a standard Chinese classification for this fan type.
Major Chinese manufacturers of this model include:
Shandong Fukang / Shandong China Coal Group
Shijiazhuang Air Blower Co., Ltd.
Yantai Longyuan Power Technology
Typical Dimensions (Approximate)
Overall Length: ~3.5 - 4.5 meters (due to twin impellers and diffuser)
Diameter: ~1.8 - 2.0 meters (casing larger than impeller)
Weight: ~4,000 - 6,000 kg (depending on motor size)
Summary of Pros and Cons
Pros:
Very high static pressure for deep mines.
High aerodynamic efficiency (reduced energy cost).
Direct drive (low maintenance, low friction loss).
Explosion-proof (safe for fiery mines).
Compact design compared to centrifugal fans.
Cons:
Relatively high initial purchase cost (twin explosion-proof motors).
Not great for handling dust or moisture (requires careful maintenance to avoid blade erosion/corrosion).
If the blade pitch is fixed (rare for this model), it cannot adjust to changing mine needs without a stop.
If you have the specific motor power rating (e.g., 2×132kW) or the blade angle (e.g., 45°), I can give you the exact airflow and pressure figures. Otherwise, the above is a standard spec for a No.14 FBCDZ-6 fan.
