There are two main reasons for the promotion of zigzag-shaped mid-disc technology in the country. Two of them are most representative: 1) It is recognized that it has wear-resistance, but it is considered to have no effect on the improvement of aerodynamic performance and efficiency. 2) It is considered that the circular middle plate is cut into a toothed disc-shaped notch, and its strength is inevitably lowered. The safety of the impeller must be poor. The outer edges of the middle plate are smaller in Rr and RH, and certain materials are removed, from the circumferential direction of the middle plate. It is observed that the area where the stress is greatly affected by the centrifugal force of the blade is retained, and the part with less stress is also reduced, and the average mass radius of the middle plate (and the impeller) is reduced, similar to the structural principle of the steel pipe, the I-beam and the twist drill. It is also similar to the stress condition of the arch (hanging) bridge. The supporting force is transmitted from both sides, and the middle of the bridge is not necessarily too thick. The middle plate looks weak after removing the material, but the stress is reasonably distributed. The best use is scientific and safe. The general double-suction induced draft fan impeller can be slotted. The shape, size, depth and bottom radius of the groove can be Calculated and empirically determined, its specific structure and manufacturing process can also be improved and innovative.
In summary, the author believes that the technology does not need to replace the new impeller without the need to add heavy anti-wear panels, no need to spray expensive wear-resistant materials, benefitless, simple and convenient, economical and effective, from the power plant fan wear-resistant From the point of view of safety, reliability, energy saving and high efficiency, from the goal of re-development and transformation of the domestic wind turbine industry, it is necessary to promote the promotion of the double-suction induced draft fan serrated medium-disc impeller.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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Ningbo Zhe Kai Electric Appliance Co.,Ltd , https://www.cnairpurifiers.com