There are two types of air filters, namely dry and wet.

Dry

It is a filter that separates impurities in the air through a dry filter element (such as a paper filter element). Air filters used in light vehicles (including cars and mini vehicles) are generally single-stage. Its shape is oblate or oval and flat. The filter material is filter paper or non-woven fabric. The end cover of the filter element is made of metal or polyurethane, and the shell material is metal or plastic. Under the rated air volume flow, the original filtration efficiency of the filter element should not be less than 99.5%. Heavy-duty vehicles must have a majority of air filters due to the harsh working environment. The first stage is a cyclone pre-filter (such as blade ring, cyclone tube, etc.), which is used to filter out coarse particles and impurities, and the filtration efficiency is above 80%. The second stage of fine filtration is a microporous paper filter element (generally called the main Filter element), its filtration efficiency is over 99.5%. There is also a safety filter element after the main filter element, which is used to prevent dust from entering the engine when the main filter element is installed and replaced, or when the main filter element is accidentally damaged. The material of the safety core is mostly non-woven fabric, and some use filter paper.

Wet

Including oil-immersed type and oil-bath type. The oil-immersed filter element separates the impurities in the air through an oil-immersed filter element. The filter element material is made of metal wire fabric and foamed material. The oil bath type is to introduce the dusty air sucked in into the oil pool to remove most of the dust, and then the air with oil mist flows upwards through a filter element made of metal wire for further filtering, and the oil droplets are blocked. The dust returns to the oil sump together.

【 Go Back 】 | 【 Print 】