Who can introduce the knowledge about air purifier professionally, comprehensively and systematically?

Air purifiers, also known as "air purifiers", air fresheners and purifiers, refer to products that can adsorb, decompose or transform various air pollutants (generally including decoration pollution such as PM2.5, dust, pollen, odor, formaldehyde, bacteria and allergens). ) and effectively improve air cleanliness, mainly divided into household, commercial, industrial and construction.

There are many different technologies and media in the air purifier, which can provide users with clean and safe air. Commonly used air purification technologies include: adsorption technology, negative (positive) ion technology, catalysis technology, photocatalyst technology, super-structure photomineralization technology, HEPA high-efficiency filtration technology, electrostatic dust removal technology and so on. Material technology mainly includes: photocatalyst, activated carbon, synthetic fiber, high-efficiency materials, negative ion generator and so on. The existing air purifiers are mostly compound, that is, multiple purification technologies and material media are adopted at the same time.

Main types of air purifiers:

According to the working principle of air purifier, it can be divided into three types: passive type, active type and active-passive mixed type.

According to the technology of air purifier to remove particulate matter in the air, there are mainly mechanical filter screen, electrostatic electret filter screen, high voltage electrostatic dust collection, negative ion and plasma method.

mechanical filtration

Generally, the following four methods are mainly used to capture particles: direct interception, inertial collision, Brownian diffusion mechanism and shielding effect. Good collection effect on fine particles, but large wind resistance. In order to obtain high purification efficiency, the resistance of the filter screen is large, and the filter screen needs to be compact, which leads to a decrease in service life and needs to be replaced regularly.

High voltage electrostatic dust collection

The dust collection method using high-voltage electrostatic field to ionize gas to make dust particles charged and adsorbed on the electrode has small wind resistance, but the collection effect of larger particles and fibers is poor, which will cause discharge, and cleaning is troublesome and time-consuming, which is easy to produce ozone and form secondary pollution.

"High-voltage electrostatic dust removal" is a way to ensure air flow and absorb fine particles. This is a way to charge the particles by loading high voltage before they pass through the filter element, so that the particles are "easily adsorbed" to the filter element under the action of electricity.

The high-voltage electrostatic dust collection part originally applied high voltage to two electrodes and charged the passing dust when the two electrodes discharged. Most dust is neutral or weakly charged, so the filter element can only filter dust larger than the mesh. However, reducing the mesh of the filter element will cause blockage. High-voltage electrostatic precipitation can make dust charged, and under the action of electricity, it will be adsorbed on the specially treated permanently charged filter element. Therefore, even if the mesh of the filter element is too large (too thick), it can really catch dust.

Electrostatic electret filter screen

purifier

Compared with mechanical filtration, it can only effectively remove particles above 10 micron, but when the particle size is reduced to 5 micron, 2 micron or even sub-micron, the efficient mechanical filtration system will become more expensive and the wind resistance will increase significantly. By filtering with electrostatic electret air filter material, high collection efficiency can be achieved under the condition of low energy consumption, and at the same time, it has the advantages of electrostatic dust removal and small wind resistance, but there is no need to externally connect tens of thousands of volts, so ozone will not be generated, and it is convenient to discard because it is made of polypropylene.

Electrostatic precipitation

It can filter dust, smoke and bacteria smaller than cells, and prevent diseases such as lung disease, lung cancer and liver cancer. The most harmful thing in the air is dust smaller than 2.5 microns, because it can penetrate cells and enter the blood. Ordinary purifiers use filter paper to filter dust in the air, which is easy to block the filter holes. Dust not only has no sterilization effect, but also easily causes secondary pollution.

Electrostatic sterilization

Using the high-voltage electrostatic field of about 60 00 volts, bacteria and viruses attached to dust can be instantly and completely killed, and diseases such as colds and infectious diseases can be prevented. Its bactericidal mechanism is to destroy four polypeptide chains of bacterial capsid protein and damage RNA.

Natural air purifier

It has been proved that the crystal gypsum lamp is a natural air purifier, which has environmental protection functions such as volatilizing negative ions, adsorbing impurities in the air and shielding harmful rays from electrical appliances. What is unique is that during the day, it presents a completely natural stone texture, which is simple, simple and heavy, emitting a strong natural atmosphere and a simple and mysterious style; At night, it becomes a magician who creates a warm atmosphere, pure white crystal gypsum mine, soft and quiet lighting; Orange crystal gypsum lamp, red light has become the host's emotional appeal, lit up, romantic atmosphere around.

It should be noted that most brands of purifiers exaggerate their functions when promoting sales, and some purifiers claim that they can "effectively capture" dozens of kinds of particulate matter. Faced with a wide variety of market brands and complex functions, consumers have a feeling of seeing flowers in the fog. To this end, experts remind consumers that they can choose products with guaranteed brands when they can't distinguish the functions of products, or choose according to the sales volume of products.

An air purifier is defined as "a device for separating and removing one or more pollutants from the air" in the relevant standards of national air purifiers. A device with a certain ability to remove pollutants from the air. It mainly refers to the single air purifier used indoors and the modular air purifier in the central air conditioning ventilation system.

According to the purification requirements, air purifiers can be divided into:

(1) purification type. If it is located in an area with moderate indoor humidity, or the requirements for air quality are not too high, it is enough to choose a purified air purifier.

(2) Humidification and purification type. If you are located in a dry area, the indoor air is often dried by air conditioners, or the air quality is required, it will be the most suitable choice to buy an air purifier with humidification and purification function. LG's future celebrity air purifier also has the technology of natural humidification, which uses scientific and technological means to vaporize water, leaves harmful substances in the tray for elimination through the rotation of windmill or disc filter, and only discharges ultra-fine and clean water molecules into the air.

(3) intelligence. If you like automatic operation, intelligent monitoring of air quality, or showing noble taste, or giving gifts needs to be more decent, then buying an intelligent air purifier is the best choice.

(4) vehicle-mounted type. If it is used to purify the air inside the car, it needs to purify the odor inside the car.

LG future celebrity air purifier

Automobile formaldehyde is polluted in the car, which can be put in the air purifier in the car, so car air purifier is the best choice.

(5) desktop type. That is, an air purifier placed on the desktop to purify the air in a certain range around the desktop and protect the health of people near the desktop. If you often sit in front of a computer, desk or desk, but the indoor area is not small, or in a public place, it is not cost-effective or fashionable to buy a large air purifier yourself, then the desktop air purifier is a better choice.

(6) Dazhong. Mainly suitable for indoor occasions with large area, such as indoor halls, senior bank offices, senior administrative offices, important lecture halls, senior hotels, hospitals, beauty salons, kindergartens and other occasions.

(7) Type of central air conditioning system. It is mainly suitable for installing central air conditioning, or a single room with ceiling, or multiple rooms are cleaned together.

Working principle of air purifier:

The air purifier is mainly composed of motors, fans, air filters and other systems. Its working principle is that the motor and fan in the machine circulate indoor air, and the polluted air passes through the air filter in the machine to remove or adsorb various pollutants. Some models of air purifiers will also install a negative ion generator at the air outlet (the high voltage in the negative ion generator will generate DC negative high voltage when working), which will continuously ionize the air and generate a large number of negative ions, which will be sent out by the micro fan to form a negative ion airflow to achieve the purpose of cleaning.

Purification principle of passive adsorption filtration (screen purification)

The main principle of passive air purifier is to draw air into the machine through a fan and filter it through the built-in filter screen, which can mainly filter dust, odor and toxic gases and kill some bacteria. The filter screen is mainly divided into particle filter screen and organic filter screen. Particle filter screen

Air purifier (9 pieces)

It is divided into coarse filtration and fine particle filtration.

The quality of the fan and filter screen of this kind of product determines the air purification effect, and the position of the machine and the indoor layout will also affect the purification effect.

Active purification principle (filter-free type)

The fundamental difference between the principle of active air purifier and the principle of passive air purification lies in that the active air purifier gets rid of the restrictions of fans and filter screens, instead of passively waiting for indoor air to be pumped into the purifier for filtration and purification, it effectively and actively releases the purification and sterilization factors into the air, and reaches every corner of the room through the characteristics of air diffusion, thus purifying the air without dead ends.

The technologies for purifying sterilization factors in the market mainly include silver ion technology, negative ion technology, low temperature plasma technology, photocatalyst technology and clean ion group ion technology. The biggest defect of this kind of products is the problem of excessive ozone release.

Double purification (active purification+passive purification)

The essence of this purifier is to combine passive purification technology with active purification technology.

Selection method of air purifier:

1, choose the appropriate purchase channel.

When buying air purifiers, it is recommended to buy them in formal channels such as large shopping malls, electrical stores, brand stores and mainstream e-commerce websites.

As of 20 13, the brand, function, performance, design and price of air purifiers are very different, which is dazzling. Consumers are advised to buy products according to their actual needs, not the more functions, the better. For example, for consumers who need to protect PM2.5, it is recommended to choose an air purifier with outstanding PM2.5 purification ability. Newly renovated families can focus on air purifiers with outstanding ability to remove formaldehyde and toluene.

2. Filtering technology

The filtration technology of particulate pollutants is mainly HEPA filter. The quality of HEPA filter is uneven. Although some small brands of filters have high filtration efficiency, they have high resistance, low energy efficiency ratio, easy blockage and short service life. It is generally recommended to choose HEPA filter with electrostatic electret to make non-woven fabric fibers have positive and negative charges, so as to effectively capture particles in the air. Many HEPA filters claim to have electrostatic electret technology, but for technical reasons, many filters have electrostatic electret charge. You can choose the HEPA filter on the market, such as 3M electrostatic electret, and adopt the same electrostatic electret technology as the 3M mask to permanently ensure the electret efficiency is not attenuated.

3. Pay attention to the applicable area or particulate clean air volume (CADR)

The purification capacity of the air purifier is mainly determined by the applicable area and the clean air volume of particles (CADR: the rate of providing clean air), and the relationship between them is: applicable area =CADR×0. 1. The ability to purify other pollutants should be combined with the applicable area.

4. Energy efficiency ratio and energy efficiency grade

Air purifiers are generally used continuously for a long time. As an important indicator to measure the purification capacity and power consumption of air purifiers, the energy efficiency ratio deserves everyone's attention. The higher the energy efficiency ratio and energy efficiency grade, the more energy-saving the air purifier and the lower the use cost.

5. Ozone release

As a strong oxidant, ozone has certain purification ability, but it is harmful to human body. The country has mandatory safety requirements for ozone release from air purifiers, which is limited to ≤5× 10-6% (ozone has a fishy smell).

Choose raiders

First of all, we should consider the use environment and the effect to be achieved. General indoor air pollution is: 1, dust, virus, bacteria, mold, mites and other allergens; 2. Inhalable volatile organic gases, such as formaldehyde, benzene and ammonia; 3. Radioactive pollution caused by radon gas released from strata and building decoration materials and its daughters. Therefore, it is necessary to comprehensively consider the functions and effects of air purification products.

Secondly, we should consider the purification ability of the air purifier. If the room is large, you should choose an air purifier with a large air purification volume per unit time. Generally speaking, a larger purifier has stronger purification ability. For example, in a room of 30㎡, choose an air purifier of120m3/h. When purchasing, you can refer to the introduction in the sample or manual to choose.

Third, we should consider the service life of the purifier and whether the maintenance is simple. If some products need to be cleaned and replaced due to the prolonged service time of the purifier adopting the principles of filtration, adsorption and catalysis, and the filter screen inside the purifier tends to be saturated with the air purifier, users should choose the purification filter screen with regenerative ability (including high-efficiency catalytic activated carbon) to prolong the service life; There are also some electrostatic products that do not need to replace the relevant modules, as long as they are cleaned regularly.

Fourth, the layout of the room and the matching of the purifier should be considered comprehensively. The air inlet and outlet design of air purifier has 360-degree circular design and one-way design.

shopping tips

First, filter the material. A good filter material (such as HEPA high-density filter material) can absorb pollutants above 0.3 micron up to 99.9%.

Second, purification efficiency. If the room is large, you should choose an air purifier with a large unit purification air volume. For example, for a room of 15 square meters, you should choose an air purifier with a unit purification air volume of 120 cubic meters/hour.

Third, the service life. As the purification filter tends to be saturated, the adsorption capacity of the purifier will decrease, so consumers should choose the purification filter with regeneration function to prolong its life.

Fourth, the room pattern. The air inlet and outlet of the air purifier have a 360-degree circular design, and there are also unidirectional air inlets and outlets. If the product is not limited by the room layout, you can choose products with circular air inlet and air outlet design.

Fifth, demand. Choose an air purifier according to the kind of pollutants to be purified. HEPA has a strong purification function for smoke, suspended particles, bacteria and viruses, and catalytic activated carbon has a good purification effect for odor and harmful gases.

Sixth, after-sales service. After the filter bag becomes invalid, it needs to be replaced by the manufacturer, so we should choose the products of enterprises with perfect after-sales service.

Main use items of air purifier:

Rapid purification: At the initial stage of operation, it is recommended to run the air purifier at the maximum air volume for at least 30 minutes, and then switch to other gears to achieve the effect of rapid air purification.

Purification of pollution: When using air purifier to remove outdoor air pollutants, it is recommended to keep doors and windows in a relatively sealed state as far as possible to avoid the reduction of purification effect caused by a large number of interactive circulation of indoor and outdoor air. After long-term use, pay attention to regular ventilation.

Decoration purification: if used to purify indoor gaseous pollution (such as formaldehyde, benzene, etc. ) decoration, it is recommended to use it after effective ventilation.

Guarantee effect: replace or clean the filter screen regularly to ensure the purification effect of the air purifier and avoid the secondary discharge of pollutants adsorbed by the invalid filter screen.

Long-term non-use: Before the air purifier that has not been used for a long time is turned on again, the cleanliness of the inner wall and the state of the filter screen should be checked, and the corresponding cleaning work should be done, and the filter screen should be replaced if necessary.

Maintenance method of air purifier:

Air purifiers, like water purifiers, need to be cleaned regularly, and some need to replace the filter screen to worry about bile, so as to maintain their purification effect. The maintenance of air purifiers depends on different brands and types of air purifiers.

A, filter purifier:

1. The front filter screen (usually the back cover of the chassis) has been used for a long time, which will gather some dust, thus affecting the effect of air intake and air purification. So use a vacuum cleaner to suck the dust away, or wipe it clean with a rag, or even rinse it with water.

2. Filters, some of which need to be exposed to the sun regularly, can better maintain the purification efficiency, such as activated carbon filters.

3. Deodorizing filter screen, the deodorizing filter screen of a few brands of air purifiers, in order to reach the technical level of cleanability, can maintain the purification efficiency and prolong the cycle of replacing the filter screen through cleaning.

4. Generally, the ionizer is built-in and does not need cleaning. A better ionizer is more efficient.

The dust filter or dust collecting polar plate in the air purifier should be cleaned frequently, usually once a week. The foam plastic or polar plate should be cleaned with soap solution and dried before use to keep the air flow unobstructed and hygienic. When there is a lot of dust on the fan and electrode, it should be removed and generally maintained once every six months. Dust on each electrode and fan blade can be removed with a long brush. When the air purifier is not in use, it should be cleaned, packed in a packing box and stored in a ventilated and dry place. Pay attention to moisture protection at ordinary times, so as not to reduce the use efficiency or damage due to moisture.

Second, the electrostatic purifier

Generally, it is only necessary to clean the electrostatic module or the dust collection module, and the method is simple. Wipe with a brush or rag, or rinse in clean water and air dry.