Dry type and wet type

Dry filter is a filter that separates impurities from the air through a dry filter element (such as paper filter element). The air filter used in light vehicles (including cars and minicars) is generally single-stage. Its shape has flat circle or ellipse and flat type. The filter material is filter paper or nonwovens. The end cover of the filter element is metal or polyurethane, and the shell material is metal or plastic. Due to the bad working environment of heavy vehicles, its air filter is the majority. The stage is a cyclone type prefilter (such as blade ring, cyclone tube, etc.) for filtering coarse particles. There is also a filter element after the main filter element, which is used to prevent dust from entering the engine when installing and replacing the main filter element, or when the main filter element is accidentally damaged. Most of the core materials are nonwovens, and some use filter paper.

Wet

Including oil immersion and oil bath. The oil immersed filter is used to separate the impurities in the air through an oil immersed filter element. The filter element materials include metal silk fabric and foaming material. The oil bath type is to introduce the inhaled dusty air into the oil pool to remove most of the dust, and then further filter the air with oil mist when passing through a metal wire wound filter element. The oil drops and the blocked dust return to the oil pool together.