However, we always recommend that the fan blades of ind […]
However, we always recommend that the fan blades of industrial fans should not be colored, because the color on the surface of the fan blades will easily fall off after a long time. However, in some specific scenes, such as business situations, customers will still require fan blades. Coloring, that is, electrostatic spraying. However, electrostatic spraying is divided into positive pressure and negative pressure. Which one is used for spraying of industrial fans?China external rotor motor fan
In theory, both positive and negative corona can be used for powder charging. However, the electrostatic spraying of industrial fans mostly uses negative corona, because the breakdown voltage of the occasional sparks produced by the positive corona is lower, the corona current obtained is also relatively small, and the charging efficiency is low; and the starting potential of the negative corona discharge It is lower than the positive polarity, and the corona discharge formed is relatively stable, not easy to break down, and easy to master and use. Therefore, negative polarity (negative high voltage) electrostatic spraying is often used when coloring industrial fan blades.
When performing negative high pressure spraying, the generator must be grounded when in use. If the sprayer is not grounded when in use, when excessive static electricity cannot be released through the ground, it will accumulate on the equipment housing (including the spray gun housing). It will make the spraying operator feel electric shock when holding the gun, so that they dare not hold the gun and cannot spray normally. At the same time, excessive static electricity can easily cause damage to the electronic components of the voltage doubler, which shortens the service life of the equipment.
Therefore, in summary, when spraying the blades of industrial fans, negative polarity (negative high voltage) electrostatic spraying must be used, and the generator must be grounded when in use.