. Today, when I am complacent that I have no life pursuit, I will put a particulate pollution tester at the air outlet of that "water-net air purifier", and then pretend to be surprised to find that this so-called "air purifier" has little effect on PM2.5, and I bought a humidifier for 3,000 yuan! Of course, I don't blame that expressive salesman for lying to me, because, obviously, she really believed it. If you have seen enough, you will find that many air purifiers have no filters. Most of these purifiers are equipped with high-pressure stunning needles, which ionize the air to produce positive and negative ions, which will make the particles charged and adsorbed on the wall to accelerate natural sedimentation. Unfortunately, these air purification functions are extremely limited. As for those scams that I don't know where a strange stone was moved from and then illuminated with a lamp, I won't go into details. Of course, I have met machines without fans. Among them, the most successful structure is "ion wind", which uses electric field force to create airflow, so that dirty air is constantly captured by the electrostatic collection layer of the air purifier. However, this structure is also facing difficulties in cleaning, poor purification effect, noise emission, excessive ozone and so on. To sum up, if there is no fan to provide strong airflow, particles can not be quickly captured by the filter, which is easily overlooked and obvious.
Then the fan and the filter screen are almost two indispensable parts of the air purifier. As for how to stack fans and filters, each region has its own style. Japanese people like to use plate structure, with a filter at the air inlet and a forward centrifugal fan at the back. The advantage of this structure is that the machine is relatively flat, the noise is not high, and the humidifying disk can be placed, which is suitable for the demands of Japanese consumers. Due to the limitation of plate structure, Japanese machines generally do not have the ability to add enough activated carbon or high-resistance filter paper. However, it is enough to alleviate the pollen symptoms of the Japanese people and calm the panic that PM2.5 floated in the past. The Japanese are very good at fighting mosquitoes. Speaking of mosquitoes, the Japanese really invented the mosquito-catching air purifier, which sold well ... They were fascinated by some gadgets, and playing with it was their specialty. Humidification, dehumidification and air conditioning are linked, so-and-so positive and negative ions, so-and-so ion groups, so-and-so water ions, and so-and-so optical flow energy. These devices even derive negative ion hair dryers. Whether it can really moisturize hair is a matter of faith.
It can be said that the air purifier in Japan has the most functions in the world. Compared with the Japanese, machines in Europe and America are more practical. For example, some tower fan purifiers that cost $29.8 to take home broke down and were thrown away. For example, air purifiers only provide HEPA for allergic people. For example, the backward centrifugal fan with faster rotating speed and greater wind pressure, and the heavy air purifier with tower structure are filled with activated carbon and high-resistance filter paper. The cost is much higher than that of Japanese machines, but the appearance is simple or even rough, and the performance will be relatively enhanced, but the noise will also be doubled. Of course, there are also many Korean machines on the market. Hanji likes to play all kinds of gimmicks, and the design is most popular with housewives. Of course, there are also physical objects, such as air purifiers as high as air conditioning cabinets, such as air purifiers larger than washing machines, such as wall-mounted air purifiers and so on. But this can't stop the Korean machine from being marginalized day by day, because the violent aesthetics in structure can't make up for the embarrassment of high price. Having said that, what is a reasonable structure? The purest air purifier must be a filter+fan structure without any fancy gimmicks. The air purifier is used to purify the air, and all its structural space should be used to quickly collect air pollutants, instead of replacing humidifiers, dehumidifiers, range hoods, oxygen generators, negative ion machines, health care instruments, mosquito traps or beauty instruments.
If you find that an air purifier has many functions, its air purification performance will definitely be greatly reduced due to insufficient structural size. Back to the original problem of the article, it is not a perfect structure to bind the axial flow fan to the filter screen, because the air volume of the axial flow fan is too sensitive to resistance, and the air volume directly affects the core index of air purification: CADR.
Similarly, installing too many filters on the air purifier will also make the filtration speed drop sharply, which is counterproductive. A mature air purifier manufacturer will always consider the structure as a whole. Type of fan, shape of volute tongue, width of volute, position of air guide ring, structure of air duct, total resistance of filter screen, shape of filter screen, arrangement order of filter screen, position and size of air inlet and air outlet, etc. Ultimately achieve a goal: make the largest amount of clean air with the lowest noise and the smallest volume-this is also the ultimate goal of all air purifier engineers. The optimal structural solution has always existed, and everyone's efforts are just closer.