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Air filter core is a kind of filter, which is mainly used in engineering locomotive, automobile, agricultural locomotive, laboratory, Aseptic Operation Room and various precision operation room. To put it bluntly, it filters impurities in the air. Air filter core engine in the process of work to absorb a large amount of air, if the air is not filtered, air suspended dust is sucked into the cylinder, it will speed up the piston group and cylinder wear. Larger particles into the piston and cylinder between, will cause a serious“Pull cylinder” phenomenon, which is dry and sandy working environment is particularly serious. The air filter is installed in front of the carburetor or intake pipe to filter out dust and grit from the air and ensure sufficient and clean air is entered into the cylinder.
In accordance with the principle of air filter, the air filter can be divided into filtering, centrifugal, oil bath, composite several. The air filter commonly used in engines include inertial oil bath air filter, paper dry air filter and polyurethane filter air filter. The inertial oil bath air filter has gone through the inertial filter, the oil bath filter and the filtering filter respectively. The latter two types of air filter are mainly filtered through the filter element filter. The inertial oil-bath air filter has the advantages of low air intake resistance, being able to adapt to the dusty and sandy working environment, long service life and so on. It has been used in many types of automobile and tractor engines before. But this kind of air filter filter efficiency is low, the weight is big, the cost is high, the maintenance is inconvenient, has been eliminated gradually in the automobile engine. Paper dry air filter filter elements are made of resin-treated microporous filter paper. The filter paper is porous, loose and folded. It has a certain mechanical strength and water resistance, with the advantages of high filtering efficiency, simple structure, light weight, low cost and convenient maintenance, it is currently the most widely used automotive air filter. Polyurethane filter air filter are made of flexible, porous, spongy polyurethane with high adsorption capacity. This air filter has the advantages of paper-based dry air filter but low mechanical strength, it is widely used in engine. The disadvantages of the latter two air filter are their short life span and their unreliability in harsh environmental conditions.