FBCDZ series (former BDK series) mine explosion-proof extraction type counter-rotating axial flow fan a large-scale mine explosion-proof axial flow fan successfully developed by combining the ventilation network parameters of our country's coal mines. It has the advantages of high efficiency, energy and low noise. The product device has a static pressure efficiency of more than 86%, which has reached the *** level of our country's mine main fan. The used by the fan have passed the friction spark test by the inspection center of the China Coal Science and Technology Institute Chongqing Branch, and have met the explosion-proof. The explosion-proof performance of the whole machine has passed the explosion-proof inspection by the National Explosion-proof Electrical Product Quality Inspection Center. Main features: 1 In order to meet the resistance requirements of the mine ventilation network and ensure the efficiency of the ventilator, this machine adopts a counter-rotating structure. The two machines'ellers rotate in opposite directions. The middle guide vane can be saved and the loss of the middle guide vane can be reduced, which improves the efficiency of the fan. . The motor is directly connected to the impeller, which avoids transmission damage accidents and also eliminates the energy loss of the transmission device, which improves the fan device efficiency. 3 The motor is all installed in a sealed box inside the main wind cylinder of the fan. The sealed box has a certain pressure resistance, which can isolate the motor from the gas containing in the wind channel of the fan, and also plays a certain role in heat dissipation. The sealed box is provided with two rows of streamlined wind pipes, which are connected to the atmosphere through the main wind cylinder, so that fresh air can flow into the sealed box, and at the same time, the air in the box can be kept in a positive pressure during the operation of the fan. 4. The static pressure efficiency of the fan device can reach more than 86%, the high efficiency area is wide, and main fan efficiency can be ensured to be more than 75% in the three mining stages. It has reversed the situation of low operation efficiency of large mine main fan in our, and can save a lot of electric energy. 5. The fan can be reversed to reverse the wind, and its reverse wind volume can reach 70% of the wind volume. There is no need to set another reverse wind channel, which has the advantages of saving the basic construction investment and the reverse wind speed is fast. 6. The angle of the blades of the impeller is adjustable, and the blade angle can be adjusted according to the production requirements. This fan adopts a special design, and the performance curve no camel peak. It can operate stably under any network resistance. 7. The series fan operates stably, the machine vibration is small, and the fan and theuser can be installed on a flat car with wheels, which can run continuously for a long time.