What role does the air filter play and how to maintain it?

First, the role of the air filter The engine will inhale a lot of air during its work. If the air is not filtered, the dust suspended in the air will be sucked into the cylinder, which will accelerate the wear of the piston group and cylinder. Large particles entering between piston and cylinder will cause serious cylinder pulling, especially in dry and sandy working environment. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand in the air and ensure enough clean air to enter the cylinder. Among the 10,000 parts in Qian Qian, 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 has a great influence on the service life of the car (especially the engine). On the one hand, if there is no filtering function of the air filter, the engine will inhale a lot of air containing dust and particles, which will lead to serious wear of the engine cylinder; On the other hand, if it is not maintained for a long time during use, the filter element of the air filter will be covered with dust in the air, which will not only reduce the filtering ability, but also hinder the circulation of air, resulting in too much mixed gas and abnormal engine operation. Therefore, it is very important to maintain the air filter regularly. There are two kinds of air filters: paper and oil bath. In recent years, paper filters have been widely used because of their high filtration efficiency, light weight, low cost and convenient maintenance. The filtration efficiency of paper filter element is above 99.5%, and the filtration efficiency of oil bath filter element is 95-96% under normal conditions. At present, the air filters widely used in automobiles are paper filters, which are divided into dry and wet types. For the dry filter element, once immersed in oil or water, the filtration resistance will increase sharply, so do not touch water or oil when cleaning, otherwise it must be replaced with a new one. When the engine is running, the air intake is intermittent, which causes the air in the air cleaner housing to vibrate. If the air pressure fluctuates too much, it will sometimes affect the intake of the engine. In addition, the intake noise will also increase at this time. In order to suppress the intake noise, the volume of the air cleaner housing can be increased, and some of them also arrange baffles in it to reduce resonance. The filter element of air filter is divided into dry filter element and wet filter element. Dry filter element is made of filter paper or non-woven fabric. In order to increase the air passing area, most filter elements are machined with many tiny folds. When the filter element is slightly polluted, it can be blown clean with compressed air. When the filter element is seriously polluted, it should be replaced in time. The wet filter element is made of sponge polyurethane. When loading, you should drop some engine oil and rub it with your hands to absorb foreign objects in the air. If the filter element is polluted, it can be cleaned with cleaning oil. If it is excessively polluted, it should be replaced with a new filter element. If the filter element is seriously blocked, the intake resistance will increase and the engine power will decrease. At the same time, due to the increase of air resistance, it will also increase the intake of gasoline, resulting in too rich mixing ratio, which will make the engine run worse, increase fuel consumption and easily produce carbon deposition. You should get into the habit of checking the filter element of the air cleaner frequently. Second, air filtration maintenance 1. Clean the filter yourself, open the front cover, and there will be a black square or rectangular box. Then there is a big snorkel connected to the throttle. There are some screws and some buttons on it. Easy to open and take out. Generally, if you clean it, blowing off the dust is enough. If it is too dark or used for a long time, it is recommended to change it. When installing, the air inside must be blown clean first. 2. Clean the air filter regularly or replace the filter element. Automobile engine is a very precise part, and tiny impurities will damage the engine. Therefore, before air enters the cylinder, it must be carefully filtered by the air filter before it can enter the cylinder. Air filter is the patron saint of the engine, and the state of air filter is related to the life of the engine. If an unclean air filter is used when the car is running, the engine will have insufficient air intake and incomplete fuel combustion, which will lead to unstable engine operation, decreased power and increased fuel consumption. Therefore, the air filter must be kept clean in the car. Under general road conditions, the air filter must be cleaned and maintained when the car travels 7500-8000km. In areas with high dust content, the maintenance cycle should be shortened accordingly. Dry air filters are widely used in new cars. The filter element of dry air filter adopts resin-treated microporous filter paper, which has the characteristics of good filtering effect and convenient maintenance. Due to different models, their structures and shapes are different, but the maintenance methods are basically the same. Maintenance should be carried out according to the mileage specified by the automobile manufacturer.