In the process of working, the engine must absorb a lot of air. If the air is not filtered, the dust suspended in the air is inhaled in the cylinder, and the wear of the piston group and cylinder will be accelerated. Larger particles enter the piston and cylinder, causing serious "cylinder pulling" phenomenon, which is particularly serious in dry and sandy working environments. The air cleaner is installed in front of the carburetor or intake pipe, which plays the role of removing dust and sand particles in the air, ensuring that the cylinder enters sufficient and clean air.
Of the thousands of parts of the car, the air filter is a very inconspicuous part, because it does not directly affect the technical performance of the car, but in the actual use of the car, the air filter has a great impact on the life of the car (especially the engine). On the one hand, if the air filter is not filtered, the engine will suck up a large amount of air containing dust and particles, causing the engine cylinder to wear badly; on the other hand, if the air filter is not maintained for a long time during use, the filter core of the air filter will be filled with dust in the air, which not only makes filtration of the air. The ability will decrease, and it will also hinder the circulation of the air, causing the mixture to be too strong to make the engine work abnormal. Therefore, it is very important to maintain air filters on time.
Air filters usually have two kinds of paper and oil bath. Paper filter has been widely used because of its high filtration efficiency, light weight, low cost and convenient maintenance. The filter efficiency of the paper filter element is as high as 99.5%, and the filtration efficiency of the oil bath filter is 95-96% in normal condition. The air filter widely used on cars is paper filter, and it is also divided into two types: dry and wet. For dry filter core, once the oil or water is immersed, the filtration resistance will increase sharply, so avoid contact with water or oil when cleaning, or new parts must be replaced.
When the engine runs, the intake is intermittent, which causes the air vibration in the air filter shell. If the air pressure fluctuates too much, it sometimes affects the intake of the engine. In addition, the intake noise will be increased at this time. In order to restrain the intake noise, the volume of the air cleaner shell can be increased, and some partitions are also arranged in order to reduce the resonance.
The filter elements of air filter are divided into two types: dry filter element and wet filter element. Dry filter material is filter paper or non-woven fabric. In order to increase the air passing area, most of the filter elements are processed with many small folds. When the filter element is slightly stained, it can be compressed by compressed air. When the filter core is seriously damaged, the new core should be replaced in time.
The wet filter element is made of sponge like polyurethane material. When used, it should be dripped with some oil and kneaded evenly by hand to absorb foreign matter in the air. If the filter element is fouled, it can be cleaned with cleaning oil, and the new filter element should be replaced if it is too dirty.
If the blockage of the filter core is serious, the intake resistance will increase and the engine power will decrease. At the same time, due to the increase of air resistance, the intake of gasoline will also increase, resulting in the mixture ratio too thicker, so that the engine running state will deteriorate, increase fuel consumption, and easily produce carbon. Normally, habit of checking air filter element regularly should be developed.
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