This article's table of contents introduction:
This is a specific model designation for a heavy-duty industrial ventilation fan used in underground coal mining. Let's break down what each part of the name FBCDZ-6-No15 means, and discuss its key features.
Model Breakdown
F: Fan
B: Explosion-proof (Bao - Chinese designation)
C: Counter-rotating (two impellers spinning in opposite directions)
D: Axial flow (Duishì - Chinese for axial)
Z: Main fan for mine ventilation (Zhǔ - Main/Principal)
6: Design Serial Number (6th generation design)
No15: Impeller Diameter (No. 15 = 5 meters or 1500 mm)
Full Name Interpretation:"Fan, Blast-proof, Counter-rotating, Ducted Zhu (main) - Series 6, with a 1500 mm diameter impeller."
Key Features & Working Principle
Counter-Rotating (CR) Technology:
Unlike a single-stage fan, this fan has two impellers mounted on a common shaft but rotating in opposite directions.
The rear impeller recovers the swirl energy from the front impeller, converting it into additional pressure.
Benefit: Very high pressure generation without requiring high tip speeds, making it ideal for overcoming the high resistance of long mine roadways.
Explosion-Proof Design:
The entire motor and fan casing are designed to contain and suppress any internal explosion, preventing ignition of the external methane/coal dust atmosphere.
The motor is typically an air-cooled, explosion-proof motor (e.g., YBF2 series).
All electrical components and seals meet strict coal mine safety standards (e.g., GB3836 in China).
High Efficiency & Low Noise:
Counter-rotating designs are inherently efficient (often >80%) because there are no stator vanes required to straighten the airflow.
The low tip speed (despite high pressure) results in relatively lower noise levels compared to high-speed centrifugal or single-stage axial fans.
Direct Drive (No Coupling or Belt):
The impeller is mounted directly onto the motor shaft. This eliminates transmission losses, reduces maintenance (no belts or pulleys), and simplifies installation.
Typical Specifications for FBCDZ-6-No15
(Note: Exact specs vary by manufacturer, but these are representative)
| Parameter | Value (Approx.) |
|---|---|
| Air Volume (Q) | 1,800 to 5,000 m³/min (or higher depending on pressure) |
| Static Pressure (Pst) | 800 to 4,500 Pa (Pascals) |
| Motor Power | 2 x 55 kW to 2 x 75 kW (or higher) |
| Motor Voltage | 380V / 660V / 1140V (Typically 660V or 1140V for mines) |
| Speed | Typically 980 rpm (low-speed) or 1450 rpm (high-speed) for a No15 |
| Efficiency | ≥ 80% |
Where is it used?
The FBCDZ-6-No15 is specifically a main mine ventilation fan. It is installed on the surface of a coal mine, directly connected to the mine exhaust shaft.
Role: It pulls stale, gassy, and dusty air out of the mine (exhaust mode).
Application: Suitable for medium-to-large scale coal mines with moderate to high ventilation resistance.
Advantages Over Traditional Fans
VS. Single-stage Axial Fans: Provides much higher pressure without needing a long, heavy shell with stator vanes. More compact for the pressure generated.
VS. Centrifugal Fans: Higher efficiency across a wider operating range, simpler installation (inline duct), and significantly lower noise.
Important Safety Note
You are looking at an explosion-proof (B) fan. This is not optional. In a coal mine, methane gas can seep into the ventilation system. A spark from a normal motor or a static discharge from a belt could cause a catastrophic explosion. The B rating ensures the fan itself is not the ignition source.
