FBCDZ-6-No19 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. Breakdown of the Model: FBCDZ-6-No19
2. Full Name Translation
3. Key Features & Why This Design is Used
4. Typical Applications & Operating Conditions
5. Why is it "No19" (1.9m diameter)?
6. Summary Table

This looks like a specific model designation for a piece of heavy industrial mining equipment. Here is a breakdown of what this name means, along with the function and key features of this type of fan.

Breakdown of the Model: FBCDZ-6-No19

Let's dissect the name "FBCDZ-6-No19":

• F: Fan
• B: Explosion-proof (Bao in Chinese pinyin, referring to explosion-proof motor and construction).
• C: Axial flow (Chouliu in Chinese).
• D: Counter-rotating (Duishuai in Chinese). This means it has two impellers rotating in opposite directions.
• Z: Main fan for a mine (specifically for use as the primary ventilation fan).
• 6: The number of poles in the motor (6-pole motor, which typically runs at ~980 RPM on a 50Hz system).
• No19: The diameter of the impeller is 19 decimeters, which is 9 meters (≈ 75 inches) .

Full Name Translation

FBCDZ-6-No19 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This is a main ventilation fan designed specifically for underground coal mines. It is an explosion-proof unit that uses two counter-rotating blades (without stationary guide vanes) to generate high pressure and airflow for exhausting air from the mine.

Key Features & Why This Design is Used

1. Counter-Rotating Design:

   • Unlike a standard axial fan (which uses one impeller and guide vanes to straighten the airflow), this fan has two impellers mounted on separate motors.
   • The front impeller spins one way, and the rear impeller spins the opposite way.
   • Effect: The rear impeller "catches" the swirling air from the front one and straightens it, converting rotational energy into usable pressure. This allows for high pressure (high static pressure is critical for overcoming mine resistance) without needing complex and bulky guide vanes.

2. Explosion-Proof (Ex):

   • Coal mines contain methane (firedamp) and coal dust, which are highly explosive.
   • The fan casing and motors are designed to contain any internal explosion and prevent sparks from escaping into the mine atmosphere.
   • The fan is likely certified as Exd (flameproof enclosure) or a similar standard.

3. Exhaust (Exhausting Air):

   • This fan is placed at the surface exhaust shaft. It pulls (sucks) stale, dusty, and flammable air (methane) out of the mine to the surface. This is known as the exhaust ventilation system.

4. Direct Drive:

   • The "6" in the model (6-pole motor) indicates a direct-drive setup. The motor shaft is connected directly to the impeller hub. There are no belts or gearboxes. This reduces maintenance and increases reliability, which is critical for a mine fan that must run 24/7.

Typical Applications & Operating Conditions

• Mine Type: Primary ventilation for underground coal mines and other non-coal mines (e.g., metal/non-metal) requiring high safety standards.
• Airflow: Typically moves 40 to 200 m³/s (85,000 to 425,000 CFM) depending on the motor power and mine resistance.
• Pressure: Provides static pressure from 1,500 to 4,500 Pa (6 to 18 in WG - inches water gauge).
• Motor Power: Usually paired with motors ranging from 110 kW to 450 kW (150 HP to 600 HP) per side (dual motors, so total power is double).

Why is it "No19" (1.9m diameter)?

A 1.9-meter diameter fan is a medium-to-large mine fan. It is typically used for:

• Medium-sized mines (annual output of ~1-3 million tons of coal).
• Main shafts that are not extremely large (e.g., shaft diameter of ~3-4 meters).

Summary Table

If you are designing a ventilation system for a mine, the "FBCDZ" series is a very common choice in China and other mining regions for main fans due to its high efficiency and explosion-proof safety.