FBCDZ-10-No35 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. FBCDZ (Fan Type / Series)
2. -10 (Blade Count)
3. No35 (Fan Size / Diameter)
4. Coal Mine Exhaust Explosion-Proof
5. Counter-Rotating Axial Flow
6. Key Technical & Operational Features
7. Typical Applications
8. Summary Table

This is a highly specific industrial product name. Let's break down what each component of "FBCDZ-10-No35 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan" means.

This is a type of main ventilation fan used in underground coal mines. Here is the detailed breakdown:

FBCDZ (Fan Type / Series)

• F: Fan
• B: Blast / Explosion-Proof (防爆, Fangbao)
• C: Counter-rotating (对旋, Duixuan)
• D: Direct Drive (电机直联, Dianji Zhilian) - meaning the impellers are mounted directly on the motor shafts, no belts or gears.
• Z: Main Fan for coal mines (主扇, Zhushan) - specifically designed for primary mine ventilation (as opposed to auxiliary or local fans).

Overall Series Meaning: The FBCDZ series is a standard series of explosion-proof, counter-rotating, direct-drive axial flow fans specifically designed for main mine ventilation systems.

-10 (Blade Count)

• The "-10" indicates the number of blades on each impeller stage.
• In this case, each of the two counter-rotating impellers has 10 blades.

No35 (Fan Size / Diameter)

• "No" stands for Number (a common designation for fan sizes).
• 35 means the fan's impeller diameter is approximately 35 decimeters (dm), which is 5 meters (about 11.5 feet).

Coal Mine Exhaust Explosion-Proof

• Coal Mine Exhaust: It is used to draw stale, gassy air out of the mine (as opposed to intake fans which blow fresh air in).
• Explosion-Proof: The motors and all electrical components are enclosed in flameproof enclosures (Exd) and are certified to operate safely in potentially explosive methane (firedamp) environments. This is critical for underground coal mining.

Counter-Rotating Axial Flow

• Axial Flow: Air flows in a straight line through the fan, parallel to the shaft.
• Counter-Rotating: The fan has two impellers stacked in the same casing. These impellers spin in opposite directions.
  • How it works: The first impeller spins and gives the air a swirling motion (swirl velocity). The second impeller spins the opposite way and straightens the airflow back out while adding more energy.
  • Advantage: This design is very efficient and generates high pressure (static pressure) without needing guide vanes or stators. This high pressure is essential for overcoming the resistance of long, complex underground mine tunnels.

Key Technical & Operational Features

• Direct Drive (D): No belts or couplings to break. This is more reliable and safer in a mine environment (no risk of sparks from belt slippage).
• High Pressure, High Volume: It can move very large volumes of air (hundreds of cubic meters per second) against high resistance (pressure).
• Reversible Airflow: Counter-rotating fans can be set to blow in reverse (for emergency ventilation reversal) by reversing the rotation direction of the motors. However, the efficiency in reverse mode is lower.
• Variable Pitch or Speed: In modern mine operations, these fans often have adjustable blade angles (variable pitch) or are paired with Variable Frequency Drives (VFDs) to change the airflow to match mine demand.
• Exhaust (Suction) Only: This model is designed for the exhaust side of the mine ventilation system. It sits on the surface at the outlet of an exhaust shaft.

Typical Applications

• Primary Mine Ventilation: The single most important fan for the entire mine.
• Outflow (Exhaust) Shaft Surface: Mounted horizontally or vertically on the surface, connected to the top of the mine's upcast shaft.
• Long Tunnels: Can also be used for tunnels, subways, or large underground caverns requiring high pressure and explosion-proof safety.

Summary Table

In short: It is a 5-meter diameter, explosion-proof, high-pressure main exhaust fan designed to safely pull stale air out of a coal mine using two direct-drive counter-rotating impellers, each with 10 blades.