Function of Air Filters

Action The engine needs to suck in a lot 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 entering between the piston and the cylinder can cause serious “pulling the cylinder”, which is especially serious in dry and sandy working environments. The air filter is installed in front of the carburetor or the intake pipe, and plays the role of filtering out dust and sand in the air, so as to ensure that sufficient and clean air enters the cylinder.

Among the thousands of parts of the car, the air filter is a very inconspicuous part, because it is not directly related to the technical performance of the car, but in the actual use of the car, the air filter is very important to the car. The service life (especially of the engine) has a huge impact. On the one hand, if there is no filtering effect of the air filter, the engine will inhale a large amount of air containing dust and particles, resulting in serious wear of the engine cylinder; on the other hand, if the air filter is not maintained for a long time during use, the air filter The filter element of the cleaner will be full of dust in the air, which not only reduces the filtering ability, but also hinders the circulation of the air, resulting in too rich mixture and the engine does not work properly. Therefore, regular maintenance of the air filter is crucial.

There are generally two types of air filters: paper and oil bath. In recent years, paper filters have been widely used due to their advantages of high filtration efficiency, light weight, low cost, and easy maintenance. The filtration efficiency of the paper filter element is as high as 99.5% or more, and the filtration efficiency of the oil bath filter is 95-96% under normal conditions. At present, the air filter widely used in the car is a paper filter, which is divided into two types: dry type and wet type. For dry filter elements, once immersed in oil or water, the filtration resistance will increase sharply, so avoid contact with water or oil when cleaning, otherwise new parts must be replaced.

When the engine is running, the intake air is intermittent, which causes the air in the air filter housing to vibrate. If the air pressure fluctuates too much, it will sometimes affect the intake air of the engine. In addition, this time will also increase the intake noise. In order to suppress the intake noise, the volume of the air filter housing can be increased, and some partitions are also arranged in it to reduce resonance.

The filter element of the air filter is divided into two types: dry filter element and wet filter element. The dry filter element material is filter paper or non-woven fabric. In order to increase the air passage area, most of the filter elements are processed with many small wrinkles. When the filter element is slightly soiled, it can be cleaned with compressed air. When the filter element is seriously soiled, it should be replaced with a new one in time.

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