Is the air purifier useful? Decode the core technology of the air purifier

Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the air purifier bother us to get rid of pollution? And look at the editors for you.

Analysis of air purifier

The critical value of PM2.5 content is 75 μg / m3

The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.

1k-5k air purifier prices vary greatly

The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.

The air quality standard of 74 key cities is only 4.1%

According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.

Air purifier sales increased by 90.5% compared with last year

According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.

HEPA filter needs to be replaced in March

The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.

Merchants claim that the purification rate is more than 99% for the concept of stealing

99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.

Air purifier purification method

HEPA filter air purifier filter

The HEPA filter is a high-efficiency particulate air filter, which is one of the most popular technologies used in air purification. HEPA is composed of very fine organic fibers, which has a strong ability to capture particles, a small pore size, a large adsorption capacity, and purification High efficiency and water absorption, its particle purification rate for 0.3 microns can reach 99.97%.

Electrostatic electret filter technology

The use of electrostatic non-woven fabric to collect dust can effectively reduce the particulate content in the air. The advantages of this technology are low wind resistance, high efficiency, and high dust capacity. The use of permanent static filter materials can block the air more than 0.1 micron particulate contaminants.

UV disinfection

The center wavelength of the ultraviolet light emitted by the ultraviolet lamp is 253.7nm, which is a type of light with strong bactericidal performance. The organic molecules, bacteria and viruses directly irradiated by it will slowly decompose and inactivate, which can effectively eliminate bacteria and viruses. However, UV disinfection cannot purify inorganic pollutants and dust, etc., and has a certain distance limit, and the energy consumption is also high.

Photocatalyst material

Photocatalyst is a kind of semiconductor material with photocatalytic function represented by nanometer titanium dioxide. It can produce catalytic degradation function under the action of light and can degrade toxic and harmful gases in the air, but the purification rate of photocatalyst is very low. The purification rate of a good purification device will not be higher than 5%.

Anion purification

Negative ions have a strong adsorption and oxidation effect, so it can efficiently and quickly kill bacteria in the air, while effectively eliminating indoor odors. Negative ions have the reputation of "air vitamins". The right amount of negative ions can make people refresh and breathe smoothly. It is also a good choice for office workers who are prone to mental fatigue.

Mistakes in the use of air purifiers

Air purifiers can play a very good role in protecting our health in our lives, but it is not that we can have 100% peace of mind in our living environment without air purifiers. Similarly, there are many in the process of using air purifiers Where you need to pay attention, you must always ask yourself questions when using it to maximize its effect.

Is the air purifier only useful in haze?

Although the upsurge of air purifiers on the market is caused by continuous smog, but for air cleaning, it is not only smog that is pollution, dust, odor, bacteria and chemical gases are all harmful in the air Substances, so the air purifier is not only used for haze weather, it is also needed in daily life, especially for new homes that have just been renovated, pregnant women, elderly children and other groups.

Can a purifier purify the entire house?

Many families buy an air purifier and fix it in a place for long-term use. I feel that this will bring a purification effect to the air in the entire home, so technically speaking, the air purifier can go out of the indoor dust and harmful suspended matter , But it also has the limitation of the use area, so it is best to place one in each independent space when using, or one can be flexibly changed in different positions.

How many hours does the air purifier use every day?

Some consumers believe that turning on the air purifier for an hour or two every day can bring a good improvement to the air in the home. Generally, the power of air purifiers on the market is not high, and mainstream products generally do not exceed 100W. It is very power-saving, so the use time of the air purifier can also be adjusted according to the indoor and outdoor air quality. When the air is poor, try to turn it on at any time.

Is the number of filter layers the better?

The number of filter layers of the air evolver sometimes becomes a major performance indicator for consumers to purchase. The more layers, the more air filtration times, and the corresponding purification effect will be better, but at the same time, the material of the filter He purification technology is also an important parameter for air purifiers, and these two points are also the source of the price difference of most purifiers.

Does using a purifier require no ventilation?

The air purifier is mainly for filtering and purifying indoor air, so some people think that with an air purifier, it is necessary to avoid indoor ventilation as much as possible to prevent outdoor quality smoke and dust from re-entering the indoor, but the long-term closed environment will cause the breeding of bacteria and exhaust gas. Accumulation, so proper ventilation every day is also important. At noon is the day when the air pollution is the weakest in the day. The time for ventilation can be appropriately longer.

Editor's comment: With the growing environmental pollution problems, air quality has rapidly become a key topic of discussion in the past two years. The "purple" of air purifiers also reflects consumers' concerns about environmental quality. The device still needs to be based on rational consumption, fully understand its purification principle, and select the most suitable product for the family.

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