Types of Air Purifiers

　　According to the working principle of air purifiers, there are mainly three types: passive, active, and active-passive hybrid.

　　According to the air purifier's removal technology for particulate matter in the air, there are mainly mechanical filter type, electrostatic electret filter type, high-voltage electrostatic dust collection, negative ion and plasma method.

　　Mechanical filtration

　　Generally, particles are mainly captured in the following four ways: direct interception, inertial collision, Brownian diffusion mechanism, and screening effect. It has a good collection effect on fine particles but a large wind resistance. In order to obtain high purification efficiency, the resistance of the filter screen is large, and the filter The mesh needs to be dense, which reduces the lifespan and needs to be replaced regularly.

　　High voltage electrostatic dust collection

　　The dust collection method uses a high-voltage electrostatic field to ionize the gas so that the dust particles are charged and adsorbed on the electrode. Although the wind resistance is small, the effect of trapping larger particles and fibers is poor, which will cause discharge, and cleaning is troublesome and time-consuming, and it is easy to generate ozone. Form secondary pollution.

　　"High-voltage electrostatic precipitator" is a method that not only ensures the air volume but also absorbs fine particles. This is how the particles are charged with a high voltage before they pass through the filter element, so that the particles are "easy to adsorb" to the filter element under the action of electricity.

　　The high-voltage electrostatic dust collection part originally applies a high voltage to the two electrodes, and when the two electrodes are discharged, the passing dust is charged. Most of the dust is originally neutral or weakly charged, so the filter element can only filter dust larger than the mesh. However, narrowing 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 indeed capture the dust.

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