1. The FBCD series explosion-proof extraction type counter rotating axial flow local ventilation fan for mining is a new generation of widely used local ventilation fan developed and produced by Shandong Mingbo Fan Co., Ltd. based on the summary of the existing counter rotating axial flow fan structure and technical performance in China. Ventilators are mainly used for extraction ventilation in the excavation of large and small section tunnels in coal mines. This ventilation fan has the characteristics of reasonable structure, high efficiency, and low noise.

2. The gas temperature for the use of FBCD series explosion-proof extraction type counter rotating axial flow local ventilation fan for mining is -20 ℃~+40 ℃, the relative humidity is not more than 95% (at 25 ℃), and the altitude should not exceed 1000m. The medium conveyed by the ventilation fan is allowed to contain methane and explosive gases, and the dust content of the gas passing through should not exceed 200mg/m³This ventilation fan is mainly used in coal mines with explosive methane gas hazards. It is installed in the return airway and used in conjunction with a negative pressure air duct for extraction ventilation.

2、 Characteristics

1. The FBCD series mining explosion-proof extraction type counter rotating axial flow local ventilation fan consists of two working hosts, with two-stage impellers rotating in opposite directions. The first stage impeller rotates clockwise, the second stage impeller rotates counterclockwise, and the number of blades in the two stages is prime to each other. The air obtains energy from the first stage impeller and is pressurized by the second stage impeller before being sent out. In addition to increasing the energy of the airflow, the secondary impeller also has the function of a static guide vane in ordinary axial flow fans. While obtaining the velocity component in the circumferential direction of the guide, it smooths out the airflow impact, increases the energy of the airflow, reduces wake vortices, and lowers noise.

2. The blades of the FBCD series explosion-proof extraction type counter rotating axial flow local ventilation fan for mining use are designed for aerodynamic performance using advanced ternary flow theory in China. The blades are twisted with wing shaped circular arc plates, resulting in high aerodynamic efficiency, wide high-efficiency area, and significant energy-saving effect. And it ensures the safe operation of the fan by allowing the airflow to pass through it smoothly and at high speed.

3. The FBCD series explosion-proof extraction type counter rotating axial flow local ventilation fan for mining adopts an external compound noise reduction device, which has ultra-low noise characteristics and has a significant effect on changing the noise environment of the underground confined space.

4. The FBCD series mining explosion-proof extraction type counter rotating axial flow local ventilation fan adopts the explosion-proof technology of the isolation chamber. The isolation chamber has a certain pressure resistance performance, ensuring that the gas containing gas flowing into the motor and fan is isolated from each other, while also playing a role in the motor's heat dissipation and flow guidance. The heat dissipation pipe connects the surroundings of the motor to the atmosphere, which not only increases the explosion-proof performance of the motor, but also allows the heat of the motor to be fully dissipated into the atmosphere.

5. The FBCD series mining explosion-proof extraction type counter rotating axial flow local ventilation fan adopts a steel plate welding structure for the main body, and the blades and the interior of the casing are treated with anti-corrosion and moisture-proof measures, which enables the fan to operate for a long time in a humid environment and effectively solves the problem of corrosion caused by other conditions on the fan.

6. The impeller blades and protective rings of the FBCD series explosion-proof extraction type counter rotating axial flow local ventilation fan for mining use are paired with H62 brass and Q235 carbon steel, and have passed the spark friction test of the National Chongqing Coal Mine Dust Prevention Ventilation Fan Safety Product Quality Supervision and Inspection Center, solving the hidden danger of fire or explosion caused by blade impact during operation in the presence of explosive gases.

7. The FBCD series mining explosion-proof extraction type counter rotating axial flow local ventilation fan is matched with YBF2 series mining explosion-proof three-phase asynchronous motor, with voltage levels of 380/660V and 660/1140V. The ventilation fan is equipped with an non-stop oil filling and discharging device to ensure that the fan can inject and discharge oil during operation, ensuring the long-term reliable and safe operation of the motor in harsh environments.