Air filter is also called air filter, air filter
, style and so on. Mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, aseptic operating rooms and various precision operating rooms.
The engine should suck in a large amount of air during the working process. If the air is not filtered, the dust suspended in the air is sucked into the cylinder, which will accelerate the wear of the piston group and the cylinder. Larger particles enter between the piston and the cylinder, causing a serious "cylinder" phenomenon, which is especially severe in dry and sandy working environments. The air filter is installed in front of the carburetor or the intake pipe to filter out dust and sand in the air to ensure sufficient air and clean air in the cylinder.
Air filters can be divided into filter, centrifugal, oil bath, and composite. The air filters commonly used in engines mainly include inertial oil bath air filters, paper dry air filters
, and polyurethane filter air filters. The inertial oil bath air filter has been subjected to inertial filtration, oil bath filtration, and filter filtration to filter the third stage. The latter two types of air filters are mainly filtered through the filter. The inertia oil bath type air filter has the advantages of small air intake resistance, can adapt to the dusty and sandy working environment, and has a long service life. It has been used in various types of automobiles and tractor engines. However, such an air filter has a low filtration efficiency, a large weight, a high cost, and is inconvenient to maintain, and has 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 and folded, has certain mechanical strength and water resistance, has high filtration efficiency, simple structure, light weight and cost. Low, easy to maintain, etc., is the most widely used automotive air filter. The filter element of the polyurethane filter air filter is made of soft, porous and sponge-like polyurethane. It has strong adsorption capacity. This air filter has the advantages of paper dry air filter, but the mechanical strength is low, in the car engine. It is widely used. The latter two air filters have the disadvantage of a short service life and unreliable operation under harsh environmental conditions.