What are the basic knowledge and advantages of explosion-proof fans?

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Structural characteristics of explosion-proof fans: The structural features and principles of explosion-proof fans. Baidu explains that explosion-proof fans are used in environments containing flammable and explosive gases, thereby preventing safety accidents caused by such substances. In fan applications, when the gas being transported contains flammable and explosive substances, dust, smoke, or substances with high volatility, short circuits in the motor, wiring faults, or sparks generated by friction between the fan impeller and its components can occur during operation. These situations can ignite the transported substances or gases, leading to serious safety accidents that result in severe casualties and economic losses for the organizations using such fans. The various axial and centrifugal explosion-proof special fans available on the explosion-proof cloud platform boast excellent performance and stable quality, and have gained recognition from users in the market. The features of explosion-proof fans on the explosion-proof cloud platform are as follows: 1. All fan components that come into contact with gases must be made of non-ferrous materials. Aluminum components are generally used, and they can operate at temperatures below 250 degrees Celsius. 2. The seal ring at the shaft through-hole of the fan’s impeller must be made of a non-ferrous material. Aluminum impellers or aluminum alloy casings are generally used. It can operate at temperatures below 250 degrees Celsius. 3. The fan’s structure must ensure that no sparks are generated as a result of friction between the impeller or shaft and its components in the event of abnormal movement. The motor used is an explosion-proof special motor that meets **certification requirements; it does not produce high-temperature sparks or smoke in the event of faults such as short circuits, wire breakdowns, or overloads. Advantages of explosion-proof fans: 1. The installation angle of the impeller blades in explosion-proof fans is adjustable, and the blade angle can be changed according to production requirements. The fan features a special design with a performance curve free of humps, enabling stable operation under any network resistance. 2. The fan installed on the outside of the motor is fully enclosed, featuring a protective thermal insulation shield as well as pressure balance tubes with sufficient compressive strength, ensuring that the motor operates in a gas-free environment at all times, as required by the specifications. 3. Fans with motors directly connected to the impeller have the simplest structure, which is used for axial ventilation and exhaust in coal mine shafts; while those with complex structures that use belt drives or long shaft drives are more suitable for operation and maintenance. 4. Some explosion-proof fans have a single-stage impeller structure. Fans and diffusers are arranged between the rear guide vanes to increase static pressure efficiency. 5. The fan can operate in reverse wind direction, with an air handling capacity that can reach 65% to 85% of that in forward wind direction; no additional ductwork is required, which saves on capital investment and reduces wind speed. Scope of application: a. Altitude not exceeding 2000m ； b. Ambient atmospheric pressure 80~110kPa ； c. Ambient temperature -20~40℃ ； d. The relative humidity of the surrounding air shall not exceed 95% (at 25°C) ； e. Areas classified as Zones 1 and 2, where explosive gas mixtures formed by flammable gases, vapors of category IIA–IIB and groups T1–T4 in combination with air exist ； f. In areas without significant vibration ； g. In an environment free from gases and vapors that damage metal insulation.