In 1892, France developed an axial fan; In 1898, Ireland designed a Sirocco centrifugal inlet with a forward propeller, which was widely used in many countries; In the 19th century, mining ventilation and explosion ventilators in the metallurgical industry, but in the 19th century, this entrance was used for only 100-300pa, with an efficiency of only 15-25%, and by the 1940s, rapid growth could only be achieved in the future.

In 1935, Deshou adopted an axial isopressure fan as ventilation and ventilation equipment for steam stoves; In 1948, Denmark adopted a dynamic leaf adjustable flow fan; Rotary axial fans, meridian acceleration axial fans, angular axial fans and cross-flow axial fans; In 2002, the explosion-proof CEN was adopted. Triple fans are widely used in chemical, kerosene, machinery and other fields. Lindong explosion-proof ionizing fan has also developed.

Working principle: Axial flow fan is based on the principle of converting kinetic energy into potential energy, using a rapidly changing wheel to accelerate the gas, and then accelerating to change the direction of the river, so that the kinetic energy in the form of po potential energy (pressure) in a single-stage centrifugal fan gas enters the impeller from the axial direction. As the gas passes through the wheel, it turns in the direction of the light and then enters the diffuser. In the diffuser, the gas changes the direction of motion, accelerates Z, and accelerates the infection to convert kinetic energy into pressure energy. The pressure inside the wheels rises severely, followed by a diffusion process. In a multistage circulation fan, the air flow is fed back into the next impeller, reducing the pressure generated.

Features: Axial flow fans are inexpensive, and axial fans are essentially a constant pressure system with variable flow rates. If the speed is on time, the actual pressure-flow curve of the axial fan should be straight. st is the actual characteristic curve, and the pressure generated by the axial fan is strongly affected by changes in input temperature or density. If the fan is running at a constant speed and resists a given flow rate, the required power is consumed as the inlet temperature decreases.