Type of air filter
According to the principle of filtration, air filters can be divided into filtration, centrifugal, oil bath, composite.
The air filters commonly used in engines mainly include inertial oil-bath air filters, paper dry air filters, polyurethane air filters and so on.
Inertia oil bath type air filter has gone through the three levels of inertia filter, oil bath type filter, filter filter, the latter two types of air filter mainly through the filter core filter. Inertial oil bath type air filter has the advantages of low intake resistance, high dust and sand working environment and long service life. But this kind of air filter filter efficiency is low, the weight is big, the cost is high, the maintenance is inconvenient, has been gradually eliminated in the automobile engine. The filter element of paper dry air filter is made of microporous filter paper treated by resin.
The filter paper is porous, loose and folded, with certain mechanical strength and water resistance. It has the advantages of high filtration efficiency, simple structure, light weight, low cost and convenient maintenance, etc.
It is the most widely used automobile air filter. The filter element of polyurethane filter element is made of soft, porous and spongy polyurethane with strong adsorption capacity.
This kind of air filter element has the advantages of paper dry air filter, but its mechanical strength is low and it is widely used in car engines. The disadvantages of the latter two kinds of air filters are short service life and unreliable operation under harsh environmental conditions