The main components of the air filter are the filter element and housing. Its working principle is that the filter medium is the main filtering means. When the air passes through the filter type air filter, the filter paper will block the impurities in the air and stick them to the filter element, so as to achieve the effect of air filtration.
The air filter is a very inconspicuous component, because it is not directly related to the technical performance of the car, but in the actual use of the car, the air filter has a great impact on the service life of the car. On the one hand, if there is no filtering effect of the air filter, the engine will inhale a large amount of air containing dust and particles, causing serious wear of the engine cylinder; On the other hand, if maintenance is not given for a long time during use, the filter element of the air filter will be full of dust in the air, which will not only reduce the filtering capacity, but also hinder the air flow, causing the mixture to be too rich and the engine to work abnormally. Therefore, regular maintenance of the air filter is essential. There are two types of air filter, paper type and oil bath type. Paper filters have been widely used because of their high filtering efficiency, light weight, low cost, convenient maintenance and other advantages. The filtering efficiency of the paper filter element is up to 99.5% or more, and the filtering efficiency of the oil bath filter is 95-96% under normal conditions. The paper air filter is widely used in cars, which is divided into dry type and wet type. As for the dry filter element, once it is immersed in oil or water, the filtering resistance will increase sharply. Therefore, it is forbidden to contact with water or oil during cleaning, or it must be replaced with a new one.