Cooling fans are widely used in life, and various types of cooling fans have been produced due to different environments. So in order to adapt to the high humidity environment, how does the cooling fan achieve the function of waterproofing? The following are some introductions to the production process of waterproof cooling fans.

      At present, there are two grades of waterproof fans that are often used on the market, namely IP55 and IP68. Among them, IP55 waterproof fans only have simple moisture-proof functions. Its manufacturing method is relatively simple, that is, three layers of anti-paint are applied on the outer surface of the motor, which has anti-oxidation ability.

      1. In view of the needs of exhaust and heat dissipation in a high humidity environment, on the basis of the improvement of the waterproof performance of the traditional brushless ventilation fan, the motor is highly sealed by means of plastic sealing. The motor sealing material generally uses the same epoxy resin material as the chip packaging material. For some waterproof motors of high rpm exhaust fans, thermal silica gel with relatively high thermal conductivity can be used for sealing.

     2. IP68 waterproof fans generally use vacuum coating or plastic packaging. The vacuum coating process is similar to the semiconductor lithography technology, and a layer of nanomaterials is deposited on the surface of the object by vapor deposition in a vacuum environment. The film thickness is generally 5 to 30 microns. The coating process has the advantages of good heat dissipation effect and fast manufacturing speed. However, nanomaterials are generally not resistant to corrosion, and the films will peel off over time, which can be used in water vapor environments. The waterproof fan sealed with epoxy resin can resist corrosion and be impacted by water, but the manufacturing speed is slow, the heat dissipation effect of the motor is not good, and the price is relatively expensive.

     3. For products with high waterproof requirements, or products that may be immersed in water, immersed in water and run, the standard of waterproof cooling fans must be as high as IPX7. In this case, the entire motor must be completely isolated from other parts so that water does not interfere with the motor. At present, the more reliable method is to seal the motor PCB board with glue.

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