Classification of air purifiers

Air purifier is also called the machine, the air cleaner, fresh air purifier, refers to the adsorption and decomposition or transformation of various air pollutants (generally include PM2.5, dust, pollen, peculiar smell, formaldehyde, decoration pollution, such as bacteria, allergens, etc.), effectively increase the air cleanliness of home appliance products, mainly divided into residential, commercial, industrial, building.

There are many different technologies and media in the air purifier, enabling it to provide clean and safe air to users.The commonly used air purification technologies include: adsorption technology, negative (positive) ion technology, catalytic technology, photocatalyst technology, super-structured light mineralization technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, etc.Material technology mainly includes: photocatalyst, activated carbon, carbon core filter technology, synthetic fiber, HEAP efficient material, generator, etc.Most of the existing air purifiers are compound, that is, a variety of purification technologies and materials are used at the same time.

Varieties division

The working principle of air purifier, mainly divided into three types: passive, active, passive hybrid.

According to the air purifier for the removal of particulate matter in the air technology, there are mainly mechanical filter, electrostatic electret filter, high voltage electrostatic dust collection, anion and plasma method.

Mechanical filter

Generally, the particles are captured in the following four ways: direct interception, inertial impact, Brownian diffusion mechanism, and screening effect, which have good collection effect on fine particles but high wind resistance. In order to achieve high purification efficiency, the filter screen has a large resistance, and the filter screen needs densification, resulting in life reduction, which needs to be replaced regularly.

High voltage electrostatic dust collection

The dust collection method, which USES high voltage electrostatic field to ionize the gas so that the dust particles are charged and adsorbed on the electrode, has a small wind resistance but poor effect on the larger particles and fibers, resulting in discharge, time-consuming cleaning, easy to produce ozone and secondary pollution.

"High voltage electrostatic dust collection" is a way to ensure both air volume and adsorption of fine particles.This is the way particles are "easily adsorb" to the filter element by charging it with a high voltage before passing through the filter element.

The high voltage collecting part is originally applied to the two electrodes at high voltage, when the discharge at the poles, electrifying the passing dust.Most of the dust is neutral or with a weak charge, so the filter can only filter to larger than the mesh dust.But reducing the mesh of the filter element will cause obstruction.High-voltage electrostatic dust collection mode can make the dust charged, under the action of electricity, adsorbed to the specially processed, permanently charged filter core, so that even if the filter core mesh is large (thick), can actually capture the dust.

Static electret filter

Compared with mechanical filtration, it can only effectively remove particles over 10 microns. However, when the particle size is divided into 5 microns, 2 microns or even submicrons, efficient mechanical filtration systems become more expensive and wind resistance increases significantly.Through electrostatic electret air filter material filtration, can achieve high capture efficiency with lower energy consumption, at the same time has the advantages of low wind resistance of electrostatic dust removal, but without external voltage of tens of thousands of volts, so no ozone, and because it is composed of polypropylene material, it is very convenient to discard.

Electrostatic dust removal

It filters dust, smoke and bacteria smaller than a cell, preventing lung, lung, liver and other diseases.The most harmful part of the air is dust smaller than 2.5 micrometers, which penetrates cells and enters the bloodstream.Ordinary purifier USES filter paper to filter the dust in the air, easy to block the filter hole, dust not only has no sterilization effect, and easy to cause secondary pollution.

Electrostatic sterilization

With a high voltage electrostatic field of about 60 00v, it can completely kill the bacteria and viruses attached to the dust instantly, and prevent diseases such as colds and infectious diseases.The mechanism of sterilization is to destroy the four polypeptide chains of the bacterial capsid protein and damage the RNA.

Natural air purifier

It has been proved that the crystalline gypsum lamp is a natural air purifier with the environmental protection functions of volatilizing negative ions, absorbing impurities in the air, shielding harmful rays of electric appliances.

It's important to note that the vast majority of brand name purifiers exaggerate their role in the sales pitch, with some claiming to "effectively capture" dozens of particles.In the face of a wide variety of market brands and complex functions, consumers have a hazy feeling.For this, the expert reminds consumer to be in cannot discriminate when the product function, can choose the product that brand has assurance when choosing, perhaps will choose according to the sale volume of the product.

In the relevant standards of the national air purifier, the air purifier is defined as "a device to separate and remove one or more pollutants from the air.A device capable of removing pollutants from the air.It mainly refers to the single air purifier used in the room and the modular air purifier in the central air-conditioning and ventilation system.