Classification and function description of auto filter: there are three kinds of filters: air filter, oil filter and fuel filter, and the air conditioning filter in the car is generally called "four filters". They are respectively responsible for the filtration of media in the engine intake system, lubrication system, and combustion system cooling system. The air filter is mainly responsible for removing particulate impurities in the air.

Auto filter is mainly responsible for removing particulate impurities in the air. When the piston machine (internal combustion engine, reciprocating compressor, etc.) is working, if the inhaled air contains dust and other impurities, it will aggravate the wear of the parts, so an air filter must be installed. The air filter consists of two parts, the filter element and the housing. The main requirements of the air filter are high filtration efficiency, low flow resistance, and continuous use for a long time without maintenance.

During the working process of the engine, metal wear debris, dust, carbon deposits and colloidal deposits oxidized at high temperatures, water, etc. are continuously mixed into the lubricating oil. The function of the oil filter is to filter out these mechanical impurities and colloids to keep the lubricating oil clean and extend its service life.

The fuel filter is also called the collector filter, which is installed at the oil suction port before the oil pump, and mostly adopts the filter screen type. Its function is to prevent larger mechanical impurities from entering the oil pump. The filter used in automobile engine is currently divided into two types: floating filter and fixed filter.

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