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Fan is a kind of machine that depends on the input mechanical energy, increases the gas pressure and sends gas side by side, which belongs to the driven fluid machinery. Fan is widely used in industry, construction, agriculture, aerospace and other fields, has an important role. Specifically, the fan can be used for ventilation, to help eliminate heat, odor, harmful gases generated in the production process, and to keep the production environment clean and comfortable; It can also be used to cool equipment and machinery to prevent overheating resulting in equipment failure or damage; It can also control the temperature, humidity, oxygen concentration and other parameters in the production process by adjusting the speed and direction of the air flow, so as to improve production efficiency and product quality. In the field of construction, the fan keeps the indoor air fresh and clean by forcing air circulation, avoiding the breeding of odors and musty smells, while helping to eliminate the accumulated heat and moisture in the room, and maintaining the comfort of indoor temperature and humidity.
The working principle of the fan mainly includes the kinetic energy conversion principle, the dynamic pressure principle and the impeller design principle. By rotating the blade or impeller, the mechanical energy is converted into air flow energy, and under the action of the blade or impeller, the kinetic energy of the air molecules is increased to form high-speed air flow. At the same time, the fan generates dynamic pressure to make the air flow have a certain pressure, which can promote the air flow in the pipeline or equipment for transportation. In addition, the blade or impeller design of the fan has an important impact on its performance, and reasonable blade or impeller design can improve the efficiency and performance of the fan.
Fans can be classified according to the direction of gas flow, mainly including centrifugal, axial flow, rotary and other types. The air flow of centrifugal fan mainly flows radial after entering the impeller of the fan axially. Axial fan The air flow enters the impeller of the fan axially and flows approximately along the axis on the cylindrical surface. Rotary fans use rotor rotation to change the volume of the air chamber to work.