Air purifier filter technology introduction.Air purifier Vendor

　　HEPA filter

　　High efficiency particulate air filter (HEPA) is one of the most popular technologies used in air purification. The standard HEPA filter can absorb 99.7% of the suspended particles with a size of 0.3 microns (0.3 microns is the most difficult to filter), but its wind resistance is relatively large, and it is rarely used in air purifiers. Actual air purifiers Is the HEPA declared by the manufacturer actually HEPA? Its filtration efficiency is slightly lower than HEPA, and the wind resistance is relatively low. Whether it is the real HEPA or the publicized HEPA, it makes the inhaled air fresher and cleaner. The filter absorbs chemical fumes, bacteria, dust particles and pollen. After being filtered by the air purifier, there are no such pollutants in the air.

　　The advantage of the HEPA filter is that it is effective and safe, and it is the most important technology to remove particulate pollutants in the air, but the disadvantage is that it can only filter out suspended particles and cannot filter out harmful gases. Air purifiers using HEPA must have a good airtight design, otherwise the air will go around the filter and lose the filtering effect.

　　Electrostatic electret filter technology

　　The use of non-woven fabrics loaded with electrostatic electrets to collect dust is an upgraded version of HEPA technology. The advantages are low wind resistance, high efficiency, high dust holding capacity, and the most important thing is safety. Represented by the "high efficiency electrostatic air filter" on the market, it uses a breakthrough filter material that carries permanent static electricity to effectively block particulate pollutants larger than 0.1 microns in the air, such as dust, dander, pollen, bacteria, etc., at the same time. Impedance ensures energy saving. In addition, the deep dust-holding design ensures a longer service life. As of 2013, it has been widely used in home and vehicle air-conditioning (such as SAIC, Volkswagen, GM and other well-known brand-selling models) and some commercial construction areas (such as the Bird's Nest, Beijing Hotel, Capital Airport Phase III).

　　Activated carbon filter

　　Activated carbon for air purification is an internationally recognized high-efficiency adsorption material. As early as the "World War I", it was used in gas masks. Activated carbon is widely used for air purification in cars or indoors. Activated carbon is a porous carbonaceous material. Its developed void structure makes it have a large surface area, so it is easy to fully contact with the poisonous and harmful gases in the air. The strong adsorption force field around the activated carbon pores will immediately become poisonous. Gas molecules are sucked into the pores, so activated carbon has a strong adsorption capacity and is also the main technology to remove gaseous pollutants. Activated carbon adsorption technology is mainly divided into two categories: physical adsorption and chemical adsorption.

　　Physical adsorption is mainly aimed at the adsorption of macromolecular organic gases (such as TVOC such as benzene) through the microporous structure of activated carbon itself. Chemical adsorption is mainly aimed at some small molecule gaseous pollutants such as formaldehyde, hydrogen sulfide, nitrogen oxides, etc., because the small molecule gas is easily separated again to form secondary pollution after being adsorbed, so it is necessary to chemically treat the activated carbon to make it The adsorbed gas reacts with the chemical components to achieve the adsorption effect.

　　Dust collection technology

　　The principle of high-voltage electrostatic adsorption is used to remove particulate pollutants in the air, such as dust, soot, pollen, cigarette smell and kitchen fumes. The disadvantage of this technology is that it is easy to produce ozone, and only has an effect on large particles such as particles. The disadvantage is that it needs to pay attention to the safety of electrical appliances (high voltage can sometimes reach tens of thousands of volts), it is difficult to clean, and it is easy to produce ozone. It must be properly designed to reduce the amount of ozone emission below a safe concentration.

　　Ozone can kill bacteria. While killing some viruses and bacteria, it may also kill human white blood cells, which may cause cancer. Therefore, it is generally not used in household air purification products. Ozone factor is mainly used to sterilize the air. Ozone is a world-recognized high-efficiency sterilization and detoxification oxidant, which can efficiently decompose various decoration pollutants and quickly kill various viruses and bacteria. It can meet the special static treatment that has just been decorated and staged, but because of the strong oxidizing effect of ozone, it will cause harm to people and accelerate the aging of the surface of the object. What needs to be reminded is that this treatment method requires personnel to avoid it, and the treatment is scheduled for 30 minutes. After it is automatically reduced to oxygen, it is a green oxidizing and decomposing agent without any chemical residues.

　　Ultraviolet rays are used to sterilize and sterilize the interior of the machine, but it is also easy to produce too much ozone. To achieve an effective disinfection function, a certain exposure time must be guaranteed. Air purifiers generally have a high wind speed, so the ultraviolet sterilization ability is limited, and the human body cannot receive ultraviolet radiation for a long time, so it must be tightly sealed.

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