Function 1 of air filter: interception
The dust particles in the air move with the inertial motion or irregular Brownian motion of the air flow or under the action of some field force. When the particle motion hits other objects, the van der Waals force between the objects makes the particles stick to the fiber surface. Dust entering the filter medium has more chances to hit the medium, and it will be stuck when it hits the medium.
Action 2 of air filter: electrostatic action
For some reason, fibers and particles may be charged, resulting in electrostatic effect. The filtering effect of electrostatic filter material can be obviously improved. Cause: Static electricity makes the dust change its trajectory and hit obstacles, which makes the dust stick to the medium more firmly.
Function 3 of air filter: filtering substances.
In fact, the air filter is to filter the solid substances in the air, such as iron filings or sand grains, but these substances will damage the piston sealing ring, block the small exhaust holes on the components, shorten the service life of the components or make them ineffective. The function of air filter is to separate liquid water and liquid oil droplets from compressed air, and filter out dust and solid impurities in the air, but it cannot remove gaseous water and oil.