According to the principle of filtration, air filters can be divided into filter type, centrifugal type, oil bath type and composite type. The air filters commonly used in engines mainly include inertial oil bath air filters, paper dry air filters,

　　 Polyurethane filter element, air filter, etc. The inertial oil-bath air filter has passed through three stages of inertial filtration, oil-bath filtration, and filter filtration. The latter two air filters are mainly filtered through filter elements.

　　 Inertial oil-bath air filter has the advantages of low air intake resistance, adaptability to dusty and sandy working environment, and long service life. It was previously used on various types of cars and tractor engines. But this kind of air filter filters

　　Clean efficiency, heavy weight, high cost, and inconvenient maintenance have been gradually eliminated in automobile engines. The filter element of the paper dry air filter is made of resin-treated microporous filter paper. The filter paper is porous, loose,

　　 Folding, with certain mechanical strength and water resistance, with the advantages of high filtration efficiency, simple structure, light weight, low cost, convenient maintenance, etc., it is a widely used air filter for automobiles. Polyurethane filter

　　The filter element of the air filter is made of soft, porous, sponge-like polyurethane with strong adsorption capacity. This air filter has the advantages of a paper dry air filter, but has low mechanical strength and is used in car engines.

　　 is widely used. The disadvantages of the latter two air filters are their short service life and unreliable operation under harsh environmental conditions.

　　The advantages of air filter

　　Various air filters have their own advantages and disadvantages, but there is inevitably a contradiction between air intake and filtration efficiency. With the in-depth research on air filters, the requirements for air filters are getting higher and higher.

　　 Some new types of air filters have appeared, such as fiber filter air filters, duplex filter material air filters, muffler air filters, constant temperature air filters, etc., to meet the needs of engine work.

amlpp0215@gmail.com  /  Shanghai Amlpp Co., Ltd

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