 Wysłany: Pią 16:32, 11 Mar 2011 Temat postu: How Air Filter Works |
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The functions of Air Filter are to eliminate detrimental molecules and impurities in the air to make sure only clean air enters the combustion chamber. This can improve combustion efficiency and reduce wearing of the cylinder, piston, valves and other components.
Air filter is located in the air induction system of the engine, and is formed by one or more air-cleaning filter components. Air filter can be classified into two filtering types, which are dry type and wet type. The dry type air filter is a filter which allow air passing through a dry filter (such as a paper filter) to separate impurities from the air. Light vehicles (including cars and minicars) are usually using single air filter. Shape of the filter is ellipse, oval, or flat and the filtering material can be filter paper or non-woven fabric. The filter cover is fixed by metal or polyurethane, and the casing is made of metal or plastic. Under the rated air volume flow, the original filter efficiency of the filter should not be less than 99.5%. The wet type ail filter includes oil immersed type and oil bath type. The oil immersed type employs a filter which had been immersed in oil to separate impurities from air. The filter is made of metal fabric or foam materials. The oil bath type is to suck dusty air into the oil tank to remove most of the dust, while further filtering occurs when air with oil mist passes through a metal wire wounded filter, which oil droplets and dust are blocked and returned to the oil tank. Oil bath air filter is usually used in agricultural sector and for marine power. |
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