In the winter, the heavy haze in the north will not be less, which makes the air purifier industry that was originally deserted this year more lively; especially in the recent days when a brand of air purifier was exposed, "the filter is unopened, App The displayed air pollution index has continued to decline, and the purification effect of the air purifier has been questioned.
So, is there any effect of the air purifier? Where is its core technology? What kinds of products are there? Here, the "empty net year · product articles" will bring you a detailed interpretation from the perspective of products.
The principle is very simple and not easy
To say whether the air purifier has any effect, you must first introduce the background of the same pollutants and the working principle of the purifier. To this end, Tencent Appliances interviewed a team of experts in the field of air purifiers made a detailed analysis.
Simply put, the principle of an air purifier is not complicated. It is to use a fan to pump air, then use a layer of dense adsorption-adsorbing filter to filter out the contaminants, and then output clean air, so that the machine is an air purifier.
Air purifier abstract principle
So is there any effect in this way? First of all, we will analyze the harmful substances in the air, which are mainly divided into two types: one is the particulate super-standard, such as the PM2.5 we are most familiar with, the sensitized pollen, bacteria, pet hair, etc.; the second is the volatile organic compounds. Excessive standards, such as formaldehyde, smoke, odor, etc.
Among them, PM2.5 is most well known because it can enter the bronchus and even the lungs directly through the respiratory system, becoming the primary culprit of respiratory diseases and cerebrovascular diseases. According to authoritative evidence, the direct & indirect fatality rate caused by haze is as high as 0.9‰ per year, which is significantly higher than the 0.7% of the death rate of smoking and 0.09‰ of the fatality rate of traffic accidents.
In order to purify these harmful substances, the most mainstream methods are divided into physical filtration technology and electrostatic dust collection technology using HEPA filters as carriers.
HEPA is not a manufacturer's name or product name, but a range of filters. The full name is High-Efficiency Particulate Air, which is a high-efficiency air particle filter. It is made of PP material, usually PP filter paper, fiberglass. Non-woven fabrics, and then through this multi-layer stack, can effectively filter out particles exceeding the standard, volatile organic compounds need activated carbon filter to absorb; and HEPA filters are generally more expensive, in order to extend their life, A relatively cheaper pre-filter is typically added to remove some of the larger particles. The shortcomings of HEPA filters are that they need to be replaced occasionally, and the cost is relatively high.
Physical filtration principle
Another purification technology is electrostatic dust collection technology. We all know the principle of heterosexual attraction between charges. Ion wind technology drives charged particles through electrostatic field force to generate airflow. The charged particulate matter is attracted by the electric field force when entering the charged dust collecting plate. Since no fan is required to promote air circulation, the electrostatic dust collector air purifier has lower noise and energy consumption than the physical filter air purifier. However, the air will inevitably produce ozone during the ionization process. If the concentration of ozone in the indoor indoor air exceeds the standard, the negative effects such as dizziness, nausea, and accelerated aging will follow. Therefore, the physical filtration technology using the HEPA filter as a carrier has been more widely used.
Electrostatic dust collection principle
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