Nowadays, air pollution is becoming increasingly serious, and many haze weather caused by air pollution occur from time to time. Even when going out, one must wear a mask to avoid inhaling pollutants. Now, there are air filters that help filter out harmful substances in the air, becoming a health aid for our breathing. Now let me introduce the function and working principle of air filters to you.
The prototype of an air filter is a respiratory protective device used by people to protect their breath. According to records, as early as the first century in Rome, people used masks made of coarse hemp for protection when purifying mercury. In the long period following this, air filters also made progress, but they were mainly used as breathing air coolers in some hazardous industries, such as the production of harmful chemicals. In 1827, Brown discovered the laws of motion of small particles, which gave people a further understanding of the mechanism of air filtration. The design of the filter itself has also made significant progress, with the important aspect being the removal of partition plates, i.e. the development of non partition filters. The non partition filter not only eliminates the danger of damaging the filter medium by the partition plate, but also effectively increases the filtration area, improves filtration efficiency, and reduces airflow resistance, thereby reducing energy consumption. In addition, air filters have made great progress in high temperature resistance, corrosion resistance, waterproofing, and antibacterial properties, meeting some special needs.
The compressed air coming from the air source contains excessive water vapor and oil droplets, as well as solid impurities such as rust, sand particles, pipeline sealants, etc. These can damage the piston sealing ring, block small exhaust holes on the components, shorten the service life of the components or make them ineffective. The function of the air filter is to separate the liquid water and liquid oil droplets in the compressed air, and filter out dust and solid impurities in the air, But it cannot remove gaseous water and oil
The structure of the air filter introduces compressed air from the inlet into the guide plate, which has uniformly distributed diagonal teeth similar to fan blades, forcing the high-speed flowing compressed air to rotate strongly along the tangent direction of the teeth. The liquid water, oil, and larger impurities mixed in the air are separated under strong centrifugal force, thrown onto the inner wall of the water cup, and flow to the bottom of the water cup. Compressed air that removes liquid water, oil, and large impurities is further filtered through a filter element to remove small solid particles, and then clean compressed air is output from the outlet. The umbrella shaped water baffle separates the water cup into two parts, with the lower part maintaining a pressure static zone, which can prevent the high-speed rotating airflow from sucking up the water and oil at the bottom of the cup. The water and oil gathered at the bottom of the cup are discharged from the drain valve. The air filter must be installed vertically with the water cup facing downwards.
The main function of an air filter is to filter the air and make it meet the specified requirements for people to use. During this process, the filter will definitely be very dirty, so it is necessary to regularly maintain the filter in order to ensure its normal operation and reduce the probability of failure.