There are not many air purifiers in the family, but they should be necessary. The air has been seriously polluted, and there will be some residual gas in the interior decoration, which is harmful to our body. In the current society, air purifier is also constantly popular, and there are many functions of air purifier. We should have a lot of needs when we purchase Attention.
Air purifier is very necessary in our society now, indoor activities are also more and more, some people like indoor sports, indoor pollution also has a lot, toilet pollution, decoration pollution, these all need air purifier to purify.
1. Filter PM2.5
HEPA (high efficiency particulate air filter) is mainly used to filter PM2.5 through HEPA. The HEPA filter is composed of a stack of continuous front and back folded sub glass fiber membranes, forming a wavy gasket to place and support the filtration boundary substance. It has strong capture ability, small pore size, large adsorption capacity, high purification efficiency and water absorption. The purification rate of 0.3 micron particles is 99.97%. In other words, only three particles per 10000 particles can penetrate the HEPA filter membrane. HEPA is internationally recognized as the best high-efficiency filter material. Initially, HEPA was used in nuclear energy research and protection, and was widely used in precision laboratories, pharmaceutical production, atomic research and surgical operations, which need high cleanliness.
2. Remove odor and VOC
1. Cold catalyst filtration
Cold catalyst is a new type of air purification material, which can catalyze reaction at room temperature and pressure, decompose a variety of harmful and odorous gases into harmless and odorless substances under normal temperature and pressure. It changes from simple physical adsorption to chemical adsorption, and decomposes at the same time of adsorption. It can remove harmful gases such as formaldehyde, benzene, dimethylbenzene, toluene, TVOC, and generate water and carbon dioxide The catalyst itself does not directly participate in the reaction, and the cold catalyst does not change or lose after the reaction, so it plays a long-term role.
2. Activated carbon filtration
Activated carbon has better gas dynamic performance, small volume density, large surface area, high adsorption efficiency, small wind resistance and long service life. Its principle is that depending on the developed pore structure and surface area of carbon, it can contact the surrounding air to a large extent, and passively absorb pollutants into its own pores. Therefore, the larger the surface and the more developed the pore structure, the more developed the adsorption capacity For example, benzene molecular weight is 78, formaldehyde molecular weight is 30, benzene adsorption will be stronger.
3. Antibacterial and sterilization
Mainly through nano silver antibacterial net, play the role of antibacterial, sterilization, its main principles:
1. Contact reaction
More than 99% of the harmful bacteria are unicellular; and the single-cell bacteria must rely on the oxidation of oxygen metabolism enzymes to breathe; the oxidation process of oxygen metabolism enzymes is the process of capturing an electron from neutral particles. When the nano silver particles are close to the bacteria, they will be adsorbed on the surface of the bacteria and enter into the bacteria body due to Coulomb gravity; the oxygen metabolism enzymes of the bacteria will capture an electron in the nano silver particles, thus turning the silver nanoparticles into silver ions with positive charges; The silver ion with positive charge reacts with the thiol group with negative charge in the bacterial protease, and the protease loses its activity rapidly due to the loss of thiol group, which leads to the bacteria unable to divide and reproduce and is killed. When the bacteria lose their activity, silver ions will be free from the bacteria, repeated sterilization activities, so its antibacterial effect is lasting.
2. Photocatalytic reaction
Under the action of light, silver can play the role of catalytic active center, activate oxygen in water and air, and produce hydroxyl radical (. 0h) and reactive oxygen ion (O2 +). Reactive oxygen ion has strong oxidation ability, which can destroy the proliferation ability of bacteria in a short time and cause cell death.
3. Negative ions
In nature, plant photosynthesis, waterfalls, thunder and lightning can produce negative air ions. People compare the negative ions in the air to "vitamins in the air". Negative ions ionize free electrons from the molecules in the air through strong electrostatic field, and combine with oxygen molecules in the air to form negative oxygen ions. At the same time, they combine with bacteria cells in the air to change the internal structure and death of cells. And make formaldehyde, toluene, smoke and dust in the air gather and settle naturally to achieve the purpose of purification. Super continuous supply of negative oxygen ions, effective activation of oxygen molecules in the air, so that your air full of vitality, more easily absorbed by the human body, is also very beneficial to human health.
4. Why does the air need to be purified
1. Upper respiratory tract infection
A large number of particles, dust, pollutants and viruses float in the air. Once inhaled by the human body, it will stimulate and damage the respiratory mucosa, make the nasal cavity dry, and damage the defense ability of the respiratory tract mucosa. Bacteria enter the respiratory tract and easily cause upper respiratory tract infection.
2. Bronchial asthma
Air pollution is more serious than usual. Bacteria and viruses are often found in the air, which can easily lead to the spread of infectious diseases and the occurrence of various diseases. In particular, air pollutants in cities are not easy to diffuse, which aggravates the toxicity of sulfur dioxide, carbon monoxide, nitrogen oxides and other substances, which will seriously threaten human life and health. Dust and dust are floating in the air, and dust mites may also be suspended in the fog. If asthma patients inhale these allergens, they will stimulate the respiratory tract, resulting in asthma symptoms such as cough, stuffy breath and poor breathing.
3. Rickets in children
The Institute of environment of China CDC has been conducting a study on the impact of haze on human health for one year. It is found that haze weather not only causes the increase of incidence / admission rate of respiratory diseases, but also has some indirect effects on human health. The appearance of haze will weaken the ultraviolet radiation. If haze occurs frequently, it will affect the synthesis of vitamin D in human body, which will lead to a high incidence of rickets in children and enhance the activity of infectious bacteria in the air.
5. Product purchase
In the market, there are many types of air purifiers, ranging from several hundred yuan to several thousand yuan. Generally speaking, at present, the filter type air purifier with mature technology and high cost performance ratio is the filter type air purifier. There are several aspects to pay attention to when selecting:
1. Relatively comprehensive function: in addition to filtering PM2.5, it can also remove odor and volatile organic compounds, antibacterial, sterilization, and release high concentration of negative ions, so the purification effect will be better.
2. Purification index: generally, the removal rate of PM2.5 is 99%, the average of odor, formaldehyde and toluene is more than 97%, and the concentration of negative ions released is up to 10 million. If there is one that has passed the relevant technical certification, it is a better machine.
3. Air quality detection sensor: the instrument is a high-precision instrument, which is the most ideal one produced by General Motors (GE), with sensitive detection and high precision.
4. Selection of filter screen: the imported filter screen is relatively better, but the price is more expensive, and the domestic difference in effect will not be too big. As the filter screen is a consumable and needs to be replaced regularly, it is not necessary to import all the filter screen when selecting.
5. Selection of purification area: according to your own needs for office and home area, choose the corresponding purifier. Generally, the larger the purification area is, the more expensive the price is.
The function of air purifier is shown in many aspects. It is necessary to install air purifier in your own home. Especially for the newly decorated house, some residual formaldehyde in the room will exist for many years, which is very harmful to our health and may lead to the phenomenon of pregnant women giving birth. We should pay attention to the air we breathe at ordinary times, so that we can have a more fresh air Medium.
