From the perspective of the working principle of air purifiers, there are mainly three types: passive, active, and mixed active and passive.
According to the air purifier technology for removing particulate matter in the air, there are mainly mechanical filter type, electrostatic electret filter type, high-voltage electrostatic dust collection, negative ion and plasma methods.
Mechanical filtration
Generally, particles are captured by the following four methods: direct interception, inertial collision, Brownian diffusion mechanism, screening effect, which has a good collection effect on fine particles but large wind resistance. In order to obtain high purification efficiency, the resistance of the filter is relatively large, and the filter The net needs to be dense, resulting in a reduced life span and needs to be replaced regularly.
High-voltage electrostatic dust collection
A dust collection method that uses a high-voltage electrostatic field to ionize the gas so that the dust particles are charged and adsorbed on the electrode. Although its wind resistance is small, it has a poor trapping effect on larger particles and fibers. It will cause discharge, and the cleaning is troublesome and time-consuming, and it is easy to produce ozone. Form secondary pollution.
"High-voltage electrostatic dust collection" is a method that not only ensures air volume but also attracts fine particles. This is a way to charge the particles by applying a high voltage before passing through the filter element, so that the particles are "easy to adsorb" to the filter element under the action of electricity.
The high-voltage dust collecting part originally applied high voltage to the two electrodes, and charged the passing dust when the two electrodes were discharged. Most dust is originally neutral or has a weak charge. Therefore, the filter element can only filter out dust that is larger than the mesh. But shrinking the mesh of the filter element will cause blockage. The high-voltage electrostatic dust collection method can make the dust charged. Under the action of electricity, it is adsorbed on the specially processed and permanently charged filter element. Therefore, even if the mesh of the filter element is too large (coarse), it can surely capture the dust.
Electrostatic electret filter
Relatively mechanical filtration can only effectively remove particles above 10 microns, and when the particle size is reduced to 5 microns, 2 microns or even sub-micron, high-efficiency mechanical filtration systems will become more expensive, and Wind resistance will increase significantly. Filtered by the electrostatic electret air filter material, it can achieve high capture efficiency with low energy consumption. At the same time, it has the advantages of electrostatic dust removal and low wind resistance. However, it does not need an external voltage of tens of thousands of volts, so it will not produce ozone. Its composition is made of polypropylene, which is convenient for disposal.
Electrostatic precipitator
It can filter dust, smoke and bacteria that are smaller than cells, and prevent lung disease, lung cancer, liver cancer and other diseases. The most harmful to the human body in the air is dust less than 2.5 microns, because it can penetrate cells and enter the blood. Ordinary purifiers use filter paper to filter the dust in the air, which can easily block the filter holes. The dust not only has no sterilization effect, but also easily causes secondary pollution.
Electrostatic sterilization
The use of a high-voltage electrostatic field of about 600 volts can instantly and completely kill bacteria and viruses attached to the dust to prevent colds, infectious diseases and other diseases. The sterilization mechanism is to destroy the four polypeptide chains of the bacterial capsid protein and damage the RNA.
According to the relevant national "Air Purifier" standards, an air purifier is defined as "a device that separates and removes one or more pollutants from the air. A device that has a certain ability to remove pollutants in the air. Mainly refers to the room. The single-unit air purifier used and the modular air purifier in the centralized air conditioning ventilation system.
According to the purification requirements, air purifiers can be divided into:
(1) Purification type. If you are located in an area with moderate indoor humidity, or the air quality requirements are not too high, the purchase of a pure air purifier will meet the demand.
(2) Humidification and purification type. If you are located in a drier area, often turn on the air conditioner to be dehumidified by the air conditioner and cause the indoor air to be dry, or have high air quality requirements, then buying an air purifier with humidification and purification function will be the most suitable choice . LG future celebrity air purifier also has natural humidification technology, using technological means to achieve water vaporization, through the rotation of a windmill or disc filter, the harmful substances are left in the tray and eliminated, and only ultra-fine and clean water molecules are discharged. Into the air.
(3) Intelligent type. If you like automated operation, intelligent monitoring of air quality, or reflect noble taste, or need to be more decent as gifts, then buying an intelligent air purifier is the best choice.
(4) Vehicle type. If it is used for air purification in cars, it needs to specifically purify car odors, car formaldehyde and other car pollution, and can be specially placed in the car air purifier, so the best choice is the car-mounted air purifier.
(5) Desktop type. It is an air purifier that is placed on the desktop to purify the air in a certain range around the desktop and protect the health of people near the desktop. If you often sit in front of a computer, desk, or desk, but the indoor area is not small, or it is a public place, it is not cost-effective or fashionable to buy a large air purifier for yourself. A type of air purifier is a better choice.
(6) Large and medium-sized. It is mainly suitable for large indoor occasions, such as home halls, high-level bank offices, high-level administrative offices, important lecture halls and conference halls, high-end hotels, hospitals, beauty salons, kindergartens, etc.
(7) Central air-conditioning system type. It is mainly applicable to the situation where a single room or multiple rooms with a central air conditioner installed or a ceiling is cleaned together.
