I don't know how many years have passed. On this afternoon, the old man in the glass house happily lay on the rocking chair with a cup of hot tea in his hand. The young grandson sat in front of his knee with his hands dragging his cheeks. His big innocent eyes flickered at the old man's loving eyes. The old man looked down kindly at his lovely grandson and slowly said: "When grandpa was young, he could see the blue sky, and there were still fish in the water in the river... Well, you'd better go and open the can of air. By the way, tell your mother that the can of water and the can of air are running out. Let her go to the vegetable market tomorrow to buy more. In addition, the filter element of the anti poison mask should also be replaced, and let your father order some from the X shop, or it won't be out in a few days The door is open

Maybe such a scenario will come soon, but we hope it is just a nightmare. According to the definition of ISO (International Organization for Standardization), air pollution is the phenomenon that some substances enter the atmosphere due to human activities or natural processes. When enough concentration and enough time are available, human health will be maintained and the environment will be polluted, Do you still remember what the blue sky looks like, my friends who live in cities that have already started the haze mode? Due to the development of industry, a large number of industrial dust and gases are discharged into the air, and various sulfur and nitrogen compounds are produced; Life's coal burning and vehicle emissions have caused too much damage to our fragile environment, and the most direct cause of air pollution to human body is respiratory disease. It is estimated that we will not toast each other in the future, but say: "Brother, come and smoke this can of purified air"!

Therefore, in these cities, it is said that there is a kind of machine called "air purifier" that has begun to be sought after by people. It is said that the air purifier has triggered a wave of queue buying. We don't know whether this air purifier is effective or not, but from the perspective of the enthusiasm of buyers, there should be a reason for its existence.

This is the trial product brought to us by Lei Feng.com, the second generation of Xiaomi air purifier. This special appliance may become an indispensable appliance in the home. Compared with ordinary household appliances, the packaging is a big piece.

The second generation of Xiaomi air purifier is much smaller than the first generation, and it is more slender. The height of the first generation is reduced from 73.5 cm to 52 cm, and the side length of the first generation is reduced from 26 cm to 24 cm, but the specification of the filter element has not changed.

Although it is a large box, the structure of the air purifier is not complicated, so it is large in volume but not heavy in weight. With a package of 6.2 kg, it will not take much effort even if you buy the resistance.

For any kind of electrical product, the manual is the standard configuration, while the manual of Xiaomi Air Purifier II is accompanied by the whole unpacking process. Generally speaking, after the box is opened, you will understand the installation process - even if you can't read, look, this is the instructions for finding the power cord and filter element.

After opening, I saw the air purifier host and an envelope wrapped in non-woven cloth bags.

Needless to say, the envelope contains the instructions with pictures and texts.

The host of the air purifier is white. Maybe the designer has added another member to the white household appliances in order to highlight the word "purification". However, according to experience, this product should get dirty quickly. The white one is less resistant to dirt than the black one after all. I hope there will be a black version for consumers to choose from in the future.

In line with the concept of simple operation, there are only two buttons on the machine, one is the power/mode button on the top, which is the usual operation button, and the other is on the back, which is used to adjust the brightness of the panel indicator light and reset the filter element counter. Usually, this button is not used after setting. There is also an indicator light on the panel to display the WIFI connection. The second generation of Xiaomi air purifier has a built-in WIFI module, which can be connected to the WIFI network at home. Users can operate remotely through the APP. Of course, if there is a Xiaomi smart home system, it can automatically start and close the purifier under the set environment. For example, when it detects that a door is open and someone is in the house, Start the purifier automatically; The purifier will automatically close when the window is opened.

The three indicators on the front panel are the working mode indicators: automatic mode, sleep mode and custom mode (favorite mode). In the automatic mode, the purification force is automatically started according to the air quality detected by the air quality detection sensor; Sleep mode reduces low motor speed to reduce noise; In the custom mode, the room size can be adjusted on the APP to enable different purification effects according to the room size. A room of 37 square meters can be set at most. Of course, the time to achieve the same purification effect will be longer if the room is larger.

The lower part of the host is covered with dense air inlet holes, from which indoor air enters and blows out from the upper air outlet after passing through the purification system. According to the design, 330 cubic meters of air can be purified per hour.

This is the air outlet at the top. Purified air is discharged from here. The second generation of Xiaomi air purifier adopts a double fan blade structure to accelerate the diffusion of purified air.

After opening the filter element door, we saw the filter element. The three-layer filtration technology is adopted. If there is a special need, you can also purchase an enhanced filter element using catalyst technology to filter out formaldehyde. If the house is newly decorated, you can consider selecting an enhanced filter element.

This is the filter element. It is light and not as heavy as expected. The three-tier structure middle layer of the filter element uses the Japanese Toray H11 filter. Toray Co., Ltd. was founded in 1926, with its headquarters in Tokyo, Japan. Dongli Group is a world famous high-tech multinational enterprise with organic synthesis, polymer chemistry and biochemistry as its core technologies. Toray is the first enterprise to develop reverse osmosis technology in the field of water purifier. Among HEPA filters, H11 refers to the filtration efficiency level. There are five levels from H10 to H14, mainly filtering particles over 0.3 microns. H10 filtration efficiency is more than 85%, and H11 filtration efficiency is more than 95%; H12 filtration efficiency is greater than 99.5%; H13 filtration efficiency is greater than 99.95%; H14 filtration efficiency is greater than 99.995%.

Since the filter element will keep the impurities of large particles out of the filter element when it is working, the filter element has a life. If the filter element is not replaced in time when it reaches its life, the polluted filter element will form a new pollution source. Therefore, there is a mark of year, month and day on the edge of the filter element. You can use a marking pen to write the start time on it. It is recommended to replace the filter element every six months.

The first generation filter element and the second generation filter element are the same size and can be interchanged.

There is also a diagram for replacing the filter element on the cover plate, so it can be assembled and operated without looking at the instructions.

Internally, this is the lower fan blade with brushless DC motor to achieve high wind pressure and stepless speed change, so as to control noise and purification effect.

The bottom is elastic, which can make the filter element and air duct closely combined.

There is a small cover on the top, which is the window of the air quality sensor.

Open it to see the air sensor, which mainly detects PM2.5 particles in the air.

Now, we install the filter element.

The power cord is on the lower back, and the power socket is a hidden design.

We have prepared a corner of the room and the purifier is ready. Of course, if you need the cooperation of the APP, you need to scan the APP in the manual. If you have installed the Xiaomi Smart Home, you can directly open the Xiaomi Smart Home. When the purifier is powered on, The APP will find the purifier and link the device according to the prompt. If the connection is abnormal, you can reset the purifier according to the prompt.

The WIFI light is on, indicating that it has been linked to WIFI.

By pressing the button, you can switch between the three modes in turn. Of course, you can also use the APP. The most important thing is that you can operate remotely. For example, when you get off work, you can turn on the purifier through the APP first. When you return home, a room of clean air is waiting for you.

The air quality indicator at the bottom is used to prompt the current air quality. According to the indication that PM2.5 is below 70, it indicates that the air quality is good. At this time, the indicator is green. If PM2.5 is greater than 75, the indicator is orange. If it is in the automatic mode, the purifier increases the rotation speed of the fan blades to achieve strong purification.

Now, let's test the purification effect. The local air is not bad. We decided to let Xiaomi air purifier smoke a cigarette to refresh ourselves. Through APP, we can see whether the air quality is good at present. The reference value of PM2.5 is 43. Of course, there is no cigarette lighting at this time. As we have previously analyzed, air pollution, from the perspective of human beings, is mainly smoke and dust emissions, so we use cigarettes to simulate.

The detector is very sensitive. As soon as the cigarette is lit, the degree will come up. Now the PM2.5 reference value has reached 69 - this is just the moment of ignition, and the good play is still to come.

Immediately, the reading rose to more than 84, and the purifier rotated rapidly, making a lot of noise.

At this time, we took the cigarette away and tested it with the PM2.5 tester. The measured value is close.

When the cigarette is held close, the reading will soar.

We put the cigarette in front of the purifier. At this time, we take the PM2.5 tester to the air outlet and test it closely.

This is the indoor air quality detected by the millet purifier. As the cigarettes are near, the reading is 175.

9 was detected at the air outlet! The purification effect is unknown. Please clean it as soon as possible. Since the air at the air outlet has just passed through the purifier, this position is relatively clean.

After a few seconds, the air outlet PM2.5 reached 6. Through purification, the air quality in the room has improved to 58.

The PM2.5 detected at the air outlet is already zero. Of course, it is out of the lower limit of the detector and cannot be detected.

When the detector is applied to the air outlet, the detection result rises again, which is higher than that of the millet purifier, because the detector of millet is on the back and the PM2.5 detector is near the cigarette.

When the cigarettes are burned out, the air quality will improve.

Over time, the measured reading is 25, and the effect is very obvious!

Now let's test the noise. We have installed a noise detection APP on the mobile phone. Although it is not a professional noise detector, it can also explain the situation through comparison. This is in the "favorite" mode, when the room size is set to 23 square meters, close to the air outlet, the noise detected is 41.8 db.

In the sleep mode, the noise is 28.7db, one meter away from the purifier. If it is placed in the "favorite mode" mode and the room size is set to the maximum, then the fan blades rotate at a high speed, the purifier runs at full speed, and the noise is obviously high.

One meter away, the noise is 58.3 db.

In the automatic mode, if the air quality is less than 70, the noise is about 30. There is almost no obvious noise during the day.

Through the above two tests, the air purification effect is very obvious, and the noise is not as big as expected. Now we need to find a better location for the purifier. Of course, in cities where the haze mode has been activated, you may need one in every room.

It is also a good idea to put the bedroom, take out a corner and return the clean air in your room!

It is a good choice to put the night vision beside the bedside table.

Of course, the air purifier can also be seen in the interface with Xiaomi TV or Xiaomi Box. However, it can't be operated. Click on the purchase page, and the hole is a bit deep. I hope engineers can quickly develop software for Xiaomi Box/TV, and can also operate the purifier with a remote control.

Well, it's night. It's time for Pappa. For this special aerobic exercise, will the mood of Pappa be affected without a room of clean air?

Well, let me tell you something. If you put a perfume bottle or essential oil in the air outlet with Xiaomi's crackling lamp, the whole room will be full of spring in an instant. What are you waiting for?