FBCDZ-6-No24 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. Direct Translation & Meaning
2. Full Functional Description
3. Technical Specifications (Inferred from the Model Number)
4. Key Advantages of this Fan Type for Coal Mines
5. Typical Performance Range (Inferred for No24)
6. Manufacturer Context
7. Summary

This is a highly specific and technical product designation for a piece of heavy industrial mining equipment. Here is a breakdown of the name FBCDZ-6-No24 and what it signifies.

Direct Translation & Meaning

Let's break the code down word by word:

• FBC: Fan, Blast (or Booster), Counter-rotating.
• DZ: (Usually) Duct type or Directly coupled, with an Zhuan (Chinese for "special" or "explosion-proof" in this context) or referring to the main application (Mine). In standard Chinese mining fan nomenclature (MT/T 754-1997), DZ often stands for Derrick/Zhuo (specialized for mine shafts).
• 6: This is the Series/Design Number (indicating a specific aerodynamic design or generation of blades).
• No24: This is the Fan Size Number. In the Chinese fan industry, "No" followed by a number refers to the Impeller Diameter in decimeters (dm) .
  • No24 = 24 dm = 2.4 meters (2400 mm) impeller diameter.

Full Functional Description

FBCDZ-6-No24 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

1. "Coal Mine Exhaust" : This fan is designed for the exhaust (return) air circuit of an underground coal mine. It pulls "dirty" air (containing methane, dust, and other contaminants) out of the mine and expels it into the atmosphere.
2. "Explosion-Proof" : The motor and all electrical components are enclosed in a flameproof enclosure. This is critical because coal mines can contain explosive methane gas. The fan must not create a spark or flame that could ignite the gas.
3. "Counter-Rotating" : This is the key feature. The fan has two impellers mounted on the same axis but rotating in opposite directions.
   • Front impeller: Rotates clockwise (viewed from the motor side).
   • Rear impeller: Rotates counter-clockwise.
   • Why? This design eliminates the need for stator vanes (guide vanes) that are common in single-stage fans. The rear impeller acts as an aerodynamic rectifier, recovering the rotational energy from the front impeller and converting it into useful pressure. This results in higher efficiency and higher pressure for a given size compared to a single-stage axial fan.
4. "Axial Flow Fan" : Air flows through the fan in a straight line, parallel to the fan's axis. This is ideal for low-resistance, high-volume mine ventilation systems.

Technical Specifications (Inferred from the Model Number)

Based on the model "FBCDZ-6-No24", here are the typical design parameters for a fan of this size used in a coal mine exhaust application.

Key Advantages of this Fan Type for Coal Mines

1. High Efficiency: Counter-rotating design offers efficiency typically in the range of 75% to 85% (peak).
2. High Static Pressure: Achieves higher pressures than single-stage axial fans, necessary to overcome the friction of long, complex mine roadways.
3. Reversible Airflow (Crucial): By reversing the rotation of both impellers (i.e., the front impeller now rotates counter-clockwise, the rear rotates clockwise), the fan can efficiently reverse the airflow direction (from exhaust to intake) without needing heavy, expensive, and space-consuming reversing doors. This is a legal requirement for main mine ventilation fans.
4. Compact & Robust: The direct-drive design (no belts or gearboxes) makes it more reliable and compact for installation in a mine shaft housing.
5. Explosion-Proof Safety: Certified to meet standards like GB 3836 (Chinese explosion-proof standard) or ATEX (European equivalent), with flameproof enclosures for the motor and wiring.

Typical Performance Range (Inferred for No24)

For a FBCDZ-6-No24 fan running at a typical speed (e.g., 740 RPM or 990 RPM, depending on the motor pole number - likely 8-pole for ~740 RPM or 6-pole for ~990 RPM for a large fan):

• Airflow (Volume): Approximately 50 to 120 m³/s (180,000 to 432,000 m³/hr).
• Static Pressure: Approximately 1,500 to 4,500 Pa (depending on blade angle and speed).

Manufacturer Context

This naming convention (FBCDZ) is standard in China, primarily used by manufacturers like:

• Shandong Metallurgical Machinery Factory
• Henan Xinghui Electric Power Equipment
• Shanxi Qingyun Ventilation Equipment
• Various other Chinese OEMs specializing in mine ventilation.

Summary

The FBCDZ-6-No24 is a large, explosion-proof, counter-rotating axial flow fan with a 4-meter diameter impeller, designed for the main exhaust ventilation of a high-capacity underground coal mine. Its counter-rotating design gives it high efficiency, high pressure, and the critical ability to reverse airflow direction easily for emergency or maintenance purposes.