It's cold. After heating, the air quality is obviously poor. Air purifier, as the handle of haze removal, has mature technology and high market share. It is generally composed of fan + pre filter + multiple filter screens with different functions. The main function of the filter is the filter screen, but the filter screen will absorb a lot of dust in the use process, which needs to be cleaned and maintained regularly, otherwise the purification effect of the air purifier will be worse, and even the noise will be greater. I'm afraid of you! You can buy your air purifier for nothing without changing the filter screen. Let's follow 360 common sense.
First, check whether the filter screen needs to be replaced
1. Judge according to the service cycle of filter screen prompted by the product;
2. The air volume at the air outlet decreased obviously and the noise became larger;
3. The PM2.5 measured at the air outlet increased significantly;
4. The air outlet has obvious peculiar smell;
5. When the color changes, the filter screen (especially HEPA) shall be replaced as soon as possible after the color turns black.
Before cleaning the filter screen, in order to ensure safety, before preparing for cleaning, first disconnect the power supply, open the door of the air purifier filter element according to the instructions, and take out the filter screen in turn. If you don't know the type of the filter element of the home purifier, please refer to the instructions, or open the filter screen cover to check the identification information on the filter screen after power failure, and start cleaning.
Pre filter screen (also known as pre filter screen / primary filter screen) is the first layer of filter screen of air purifier, and also the most easily dirty one
Cleaning cycle: depending on the frequency of use, it is usually appropriate to clean 1-2 times a month.
Cleaning steps: Wipe / suck, wash and dry.
Specific operation: use a rag / vacuum cleaner to remove the dust. If you think the cleaning is not thorough enough, you can wash it with water. Remember to use a soft brush.
Activated carbon filter screen
The main function of activated carbon filter screen is to remove formaldehyde, toluene and other volatile organic compounds, as well as to remove peculiar smell and deodorization.
Cleaning cycle: for newly decorated users, southern plum rainy season and Northern rainy season, it is recommended to clean and air once a month at least; in other cases, the cleaning cycle can be adjusted appropriately according to different use frequency.
The cleaning steps are: Wipe / absorb and sun.
Specific operation: the dust on the surface of the activated carbon filter screen can be wiped with a dry cloth or cleaned with a low-level vacuum cleaner. Due to the particularity of pore structure and fixation of the activated carbon, it is not recommended to wash it with water if there is no clear description.
Put the cleaned filter screen in the outdoor sunlight, and expose the front and back sides for 2-3 hours respectively, so as to make it warm up and "desorb", so as to achieve the effect of "regeneration" of activated carbon. Although the effect is limited and the fate that will be replaced will not be changed after 3-4 times of exposure, it is necessary to clean the filter screen regularly to maintain the purification effect and reduce the risk of secondary pollution~
HEPA filter screen
HEPA high efficiency air filter has the characteristics of large wind resistance, large dust capacity and high filtering accuracy.
Cleaning cycle: according to different use frequency and pollution conditions, it is usually cleaned once every 1-2 months, or the cleaning time can be determined according to the accumulated use time.
The cleaning steps are: suction / wiping and drying.
Specific operation: HEPA filter screen is generally made of paper. If there is no specific mark, it can not be washed and cleaned. Otherwise, the pore structure of the filter screen will be changed or even blocked, which will directly affect the purification effect.
Vacuum cleaner can be used to clean the dust on the surface of the filter screen (except for fiberglass HEPA) or dry cloth and paper towel can be used to gently wipe, and proper drying can be carried out, if possible, ultraviolet sterilization can also be carried out; however, if the original white filter screen color is found to be blackened, it must be replaced as soon as possible, and the surface of the filter screen shall not be scratched during cleaning.
After all cleaning, the installation will be completed. It should be noted that the removed parts and filter screen should be installed in the order from inside to outside (pay attention not to install them in the opposite direction). After confirmation, power on the machine for start-up test. Some brands need to reset the filter element if the filter element is replaced.
Questions and answers of various filter screens:
The filter screen of each layer will be replaced directly when the time comes. Is it necessary to clean it?
The pre filter screen is a wire mesh, which can be reused. It mainly intercepts the sundries and pollutants of dust, hair, scurf and other large particles. If it is not cleaned in time, it will affect the air inlet and Cadr (air purification capacity).
As the name implies, the activated carbon filter screen contains a large amount of activated carbon, which is also composed of carbon cloth (relatively short service life). The adsorption of activated carbon on substances can be said to be non selective. In addition to the fact that some macromolecules cannot enter the pore diameter of activated carbon, they will absorb pollutants, peculiar smell and water in the air. This is also the reason why the filter screen will become damp or even have peculiar smell after a period of use, especially When the indoor air humidity is high.
HEPA filter screen has limited dust capacity. After a period of use, the adsorption capacity of the filter will also decline. If it is not cleaned and replaced in time, the wind resistance will increase, the noise will increase, and the purification effect will be affected.
Can activated carbon filter really cause secondary pollution?
The adsorption of activated carbon is based on its large specific surface area and highly developed pore structure. Its adsorption mode is divided into physical adsorption and chemical adsorption. When the adsorption capacity of activated carbon filter reaches a certain degree, the adsorption force becomes weak. If the temperature rises, the pollutants adsorbed on the activated carbon do release again, resulting in the risk of secondary pollution. Therefore, it is recommended to air them regularly and replace them in time.
Is the higher the HEPA filter efficiency, the better?
HEPA filter screen is the main way to remove particulate pollutants (PM2.5, etc.) and has certain filtering effect on bacteria, etc. it can be said that it is the core component of the filter screen. At present, many air purifiers will choose H13 filter screen.
According to the European Union standard, the filtration efficiency of H13 is higher than 99.97% for particles above 0.3 μ M. the price of this kind of filter screen will be very expensive, and the filtration efficiency of filter screen with grade 1-2 lower than that of H13 can be more than 99% and 95% theoretically;
The higher the filtration efficiency of HEPA filter screen is, the greater the wind resistance will be under the same wind, the corresponding energy consumption and noise will become larger, and the air tightness requirements will be higher;
At the same time, large wind resistance will directly lead to small air output (Cadr becomes smaller) and reduce the purification capacity. Therefore, it should be considered comprehensively that the filter efficiency of the filter screen should not be blindly increased, but should pay attention to later cleaning and replacement.