Air purifiers are classified according to working principle

Judging from the working principle of the air purifier, there are three main 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, the following four methods are used to capture particles: direct interception, inertial collision, Brownian diffusion mechanism, screening effect, which has a good collection effect on fine particles but high wind resistance. In order to obtain high purification efficiency, the resistance of the filter screen is large, and the filter The network needs to be dense, which leads to a reduction in life, and it needs to be replaced regularly.

High voltage electrostatic dust collection

A dust collection method that uses a high-voltage electrostatic field to ionize gas to charge dust particles to the electrode. Although its wind resistance is small, it has a poor collecting effect on larger particles and fibers, which will cause discharge, and it is troublesome and time-consuming to clean, 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 absorbs fine particles. This is the way in which particles are charged by applying a high voltage before passing through the filter core, so that the particles are "easy to be adsorbed" on the filter core under the action of electricity.

The high-voltage dust collecting part originally applied a high voltage to the two electrodes, and when the two electrodes were discharged, the passing dust was charged. Most dust is originally neutral or weakly charged, so the filter element can only filter dust larger than the mesh. But narrowing the mesh of the filter element can 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 (thick), the dust can be reliably captured.