The air filter is installed in the front of the carburetor or the intake pipe to filter the dust and sand in the air to ensure that sufficient and clean air is entered into the cylinder.
Type of air filter element
According to the filtration principle, the air filter can be divided into filter type, centrifugal type, oil bath type and compound type. The air filters commonly used in the engine are mainly inertia oil bath air filters, paper dry air filters, polyurethane filter air filters and so on.
Inertia oil bath type air filter has been filtered by inertia type filter, oil bath type filter, filter type filter three filtration, the last two kinds of air filter mainly through the filter element filter type filter. Inertial oil bath type air filter has the advantages of low intake resistance, can adapt to dusty and sandy working environment, long service life, etc., previously used in a variety of models of automobiles and tractor engines.
However, this air filter has low filtration efficiency, large weight, high cost and inconvenient maintenance, and 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, folded, has certain mechanical strength and water resistance, and has the advantages of high filtration efficiency, simple structure, light weight, low cost, easy maintenance, etc. It is the most widely used automotive air filter in the front.
The filter element of the air filter is made of soft, porous, spongy polyurethane, which has strong adsorption capacity. This air filter has the advantages of paper dry air filter, but the mechanical strength is low, and it is widely used in the car engine. The disadvantages of the latter two air filters are shorter service life and unreliable operation under harsh environmental conditions.
Advantages and disadvantages of air filter element
All kinds of air filters have advantages and disadvantages, but there is inevitably a contradiction between the intake volume and the filtration efficiency. With the in-depth study of air filters, the requirements for air filters are becoming higher and higher. There are some new air filters, such as fiber filter element air filter, compound filter material air filter, acoustic air filter, constant temperature air filter, etc., to meet the needs of engine work.
