Whole house Air purification machine
Working principle and types
An air purifier usually consists of a fan and air filter system. Its working principle is: the fan (also called a fan) in the machine circulates indoor air, and the polluted air removes or adsorbs various pollutants through the filter in the machine. , to achieve the purpose of cleaning and purifying the air.
Air purifiers generally come in wall-mounted, hanging, ceiling-mounted and floor-standing types; according to air purification technology, they are divided into: HEPA air purifiers, activated carbon air purifiers, electronic air purifiers, ultraviolet air purifiers, Clean room air purifier, negative ion air purifier, ion wind air purifier, ozone air purifier, etc.
Main technique
air purifier
There are many different technologies and media in an air purifier that allow it to provide clean and safe air to its users. Commonly used air purification technologies include: HEPA high-efficiency filtration technology, light plasma technology, adsorption technology, negative ion technology, negative oxygen ion technology, molecular complexation technology, titanium dioxide photocatalyst technology, electrostatic dust collection technology, active oxygen technology, etc.; material technologies mainly include : Photocatalyst, activated carbon, synthetic fiber, HEPA high-efficiency material, negative ion generator, etc. Existing air purifiers are mostly composite types, which use a variety of purification technologies and material media at the same time.
HEPA filter
High-Efficiency Particulate Air (HEPA) is the most popular technology used in air purifiers, and it is also the most stable physical filtration method without side effects. The HEPA filter can absorb 99.7% of 0.3 micron suspended particles (0.3 micron is the most difficult size to filter), making the inhaled air fresher and cleaner. Usually HEPA filters can absorb chemical fumes, bacteria, dust particles and pollen. The advantage of HEPA filter is that it is effective and safe. Its filtration capacity is higher than electrostatic dust collection technology, but it cannot filter out harmful gases.
As the HEPA level increases (mostly H11~H13 levels on the market), the greater the wind resistance it generates, the more noise it generates. Please choose the relevant filter according to the specific environment (please try to use H12 in heavily polluted environments) and above filters). In addition, filters that are not replaced on time can easily become a breeding ground for bacteria, causing secondary pollution. Users must check them regularly or use air purifiers with smart filter management technology; HEPA air purifiers must have good performance Air-tight design, otherwise the air will bypass the filter and lose the filtering effect.
light plasma
O2 molecules and H2O molecules in the air are irradiated by nano-light tubes of special wavelengths and decomposed into plasma gas flows with highly oxidizing photo-plasma. These photo-plasma gas flows with a large number of electronic bonds have the ability to destroy organic molecules and can quickly neutralize them. It decomposes volatile formaldehyde, toluene, VOC and other gas molecules in the air into water and carbon dioxide. The technology itself does not produce any other harmful substances. The water molecules formed due to the neutralization of formaldehyde molecules can continue to act again through the nanolight tube, completely decomposing the pollutants through such a chain reaction.
Electrostatic filter
Use static-charged non-woven fabrics to collect dust. The advantage is that it is very effective and safe. Some companies have introduced electrostatic filters that can be added to air conditioners (such as 3M). However, since most air conditioners are not designed with an additional electrostatic filter, the electrostatic filter can only cover part of the air conditioning air inlet area. , to prevent the air-conditioning air volume from being greatly reduced. Even if it is completely covered, air will still enter the air-conditioning and heating machine directly through the slits, and the filter will not be able to use its full capabilities.
Electrostatic dust collection
Electronic technology uses electron charges, which have opposite charges in the air purifier. The two charges attract each other and capture the particles in the air purifier, absorbing the particles into the collection plate and removing them from the air. The electrostatic dust collection system must be well designed to avoid cleaning, but if it can be easily cleaned, it is a fairly cheap and effective method. Moreover, the high-voltage electricity used in electrostatic dust collection can destroy bacteria and viruses, and it also has the effect of deodorizing and decomposing organic gases. ; Can be washed with heavy water, but it is best to be cleaned by professionals. Proper design can reduce ozone emissions below safe concentrations.
However, according to research, the removal efficiency of the electrostatic dust collection system is inversely proportional to the wind speed. The greater the air volume of the air purifier, the lower the effect of the electrostatic dust collection.
Activated carbon filter
Activated carbon filters are quite effective in deodorizing and absorbing harmful gases; however, to filter suspended particles, you still need to use other types of filters such as HEPA. The advantage is that it is safe and effective, but the disadvantage is that replacement costs are high.
Photocatalyst
Under ultraviolet light irradiation, photocatalysts can decompose many harmful gases and disinfect and sterilize.
Essential oils
Essential oils can only cover up odors. If you use incense sticks (such as sandalwood) to incense, a large number of pollutants such as tar, suspended particles, and carbon monoxide will be released due to incomplete combustion. However, atomized essential oils can cause irritation and allergic reactions to the respiratory tract, so special attention should be paid when using them.
Utility
Air purifiers cannot solve the problem of increased carbon dioxide concentration unless the air is introduced from the outside. Some models are already fixed on the window and directly filter the outdoor air and introduce it into the room. Air purifiers are ineffective against second-hand smoke. To slow down the harm caused by second-hand smoke, the ventilation capacity must be extremely high, and the filter is consumed very quickly. It is better to use a powerful exhaust fan to extract the second-hand smoke outdoors (this is why reasonable anti-smoking laws require Smoking is strictly prohibited indoors and within a certain distance from doors and windows); just like the kitchen uses a range hood to reduce the damage caused by oil smoke. The same principle applies to pollution caused by gold paper and incense sticks.
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