FD series underground mine counter-rotating axial flow local ventilators are mainly used for medium to long-distance ventilation of mining faces in non-coal mine underground areas. They are a new generation of versatile local ventilators. FD series underground axial flow fan product advantages: 1. The FD series underground axial flow fans have the characteristics of reasonable structure, complete specifications, significant effects, low noise, and long air supply distance. Ventilation can be maintained normally without moving the fan within a tunnel length of 2000m, reducing the labor intensity of workers, saving ventilation time, and making them the ideal equipment for local ventilation in non-coal mine underground areas. 2. The FD series underground counter-rotating axial flow local ventilators consist of two working main units, with two impellers rotating in opposite directions. That is, the first impeller rotates clockwise, and the second impeller rotates counterclockwise, with the number of blades in each stage being prime numbers. Air gains energy from the first impeller, is pressurized by the second impeller, and then discharged. In addition to increasing the airflow energy, the second impeller also has the function of a static guide vane in a general axial flow fan, straightening the airflow impact, increasing the airflow energy, reducing the tail vortex, and lowering the noise. 3. The FD series underground counter-rotating axial flow local ventilators adopt an external compound silencing device, featuring ultra-low noise characteristics, which changes the noise environment of the confined space underground. 4. The main body of the FD series underground counter-rotating axial flow local ventilator is made of steel plate welding structure, with blades and internal casings treated for corrosion and moisture resistance, allowing the fan to operate for a long time in a humid environment, effectively solving the problem of corrosion caused by other conditions. zmjt062 5. The配套 motor for the FD series underground counter-rotating axial flow local ventilator is a Y series three-phase asynchronous motor with a voltage grade of 380V. The ventilator can be equipped with a non-stop operation oil injection and drainage device to ensure that oil injection and drainage are performed during operation, ensuring the long-term reliable safe operation of the motor under harsh conditions. 7. The operating environment for the FD series underground counter-rotating axial flow local ventilator has a gas temperature of -20℃ to +40℃, relative humidity not exceeding 95% (at 25℃), and an altitude not exceeding 1000m. The dust content of the medium conveyed by the ventilator must not exceed 200mg/m3. The ventilator mainly conveys air and non-corrosive, non-spontaneously combustible media without粘性 substances, with a dust content not exceeding 200mg/m3.