FBCDZ-6-No14 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. Model Breakdown (FBCDZ-6-No14)
2. Key Technical Specifications (General for this Class)
3. Design Features
4. Application in Coal Mining
5. Manufacturer / Code Context (FBCDZ)
6. Typical Dimensions (Approximate)
7. Summary of Pros and Cons

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)

1. F - Fan
2. B - Explosion-Proof (防爆) - The motor and components are designed to prevent sparks from igniting methane or coal dust in the mine.
3. C - Counter-rotating (对旋) - The fan has two impellers that rotate in opposite directions on the same axis.
4. DZ - Axial Flow (轴流) - Air flows parallel to the fan's shaft.
5. -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.
6. -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

1. 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).

2. 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.

3. Direct Drive:

   • The impellers are mounted directly on the motor shafts. No belts or couplings are used. This eliminates transmission losses and reduces maintenance.

4. 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.

5. 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.