The purification of air purifiers should be divided into three categories from its working principle

The first category: passive purification category Baidu (filter purification category)  The main principle is: the air is drawn into the machine with a fan, and the air is filtered through the built-in filter, which can mainly filter dust, odors, toxic gases and kill parts The role of bacteria. The filter is divided into: dust collection filter, formaldehyde removal filter, deodorization filter, HEPA filter, etc. Among them, the higher cost is the HEPA filter, which can decompose toxic gases and sterilize, especially to inhibit secondary pollution. The feature of this type of product is that the fan function and the quality of the filter determine the purification effect, the placement of the machine and the indoor layout affect whether the purification is complete, the indoor purification effect is uneven, and it is difficult to complete, and the filter replacement cost is high. The second category: Active purification (no filter type)   According to the active sterilization principle of these products, it can be divided into silver ion technology, negative ion technology, low temperature plasma technology, photocatalyst technology and plasmatic ion technology. The first generation, silver ion purification technology. To put it simply, the silver block is ionized and blown into the air to achieve a sterilization effect. The disadvantages are high product cost, low bacteria killing rate, and almost no killing properties for viruses. The second generation, negative ion technology. The main principle is to use static electricity to release negative ions and absorb dust in the concentrated air to reduce dust. At the same time, negative ions also ionize oxygen in the air into ozone, and have a certain killing effect on bacteria. The advantage of this type of product is the production cost. Lower. The third generation, low temperature plasma technology. The main principle is that by applying a voltage to the gas's discharge voltage, the gas is broken down, producing various strong oxidizing low-temperature plasmas, and decomposing the contaminants in contact in a very short time. This kind of technology is generally used in industrial waste gas treatment, and secondary pollution is generated after chemical reaction. If it is applied to household air purifiers, human safety tests and corresponding secondary pollution treatment technologies are required. The fourth generation, photocatalyst technology. Photocatalyst is actually a technology that uses semiconductors to release strong oxidizing free radicals under the irradiation of light. The advantage of this technology is that the product cost is lower, but the disadvantage is that the free radical activity causes it to stay in the air for a short time, and its killing effect on viruses and bacteria is also limited. The fifth generation, Plasmacluster technology. It is a technology that directly ionizes water molecules in the air into H free radicals and OH free radicals, and then wraps the water molecules. The killing rate of OH free radicals to viruses and bacteria exceeds that of ozone, and it stays in the air for longer than ozone. Plasmacluster ion technology enables OH radicals to wrap a layer of water molecules to maintain their existence time in the air. At the same time, using the pouring water of bacteria and viruses, it can kill bacteria and viruses more quickly. This technology is currently internationally recognized medical space purification technology, and it is also the only space purification technology that can kill H1N1, H1N5 avian influenza and SARS at a rate of over 99%. The third category: double purification (active purification + passive purification)
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