What is the working principle of an air filter?

[Skylar]

Different air filters have different working principles, as detailed below: 1. Dry inertial air filter: Utilizes the suction force generated by the cylinder during intake to create a pressure difference between the inside and outside. External air enters the air filter at a high speed under pressure, throwing larger dust particles mixed in the air into the dust collection cup, thus completing air filtration. 2. Wet inertial air filter: After air enters the filter, it flows downward at high speed along the central tube to the oil pool surface, then abruptly changes direction upward, creating a rotational motion. Some larger dust particles, due to inertia, cannot follow the reverse airflow and are trapped in the oil, completing air filtration. 3. Dry filtration air filter: As air enters the filter, it passes through a paper filter element, which separates or traps dust particles from the air. 4. Wet filtration filter: After oil bath filtration, the air passes through an oil-soaked metal mesh, where fine dust particles are blocked and some trapped particles drip down with the engine oil.