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Regarding whether the air conditioner fan motor is grounded is a problem that many manufacturers and testing organizations are very concerned about. This problem has been around for a long time, and the debate has emerged. In fact, the problem of grounding and insulation is carefully analyzed, and this problem is solved. “Safety of Household and Similar Electrical Appliances Part 1: General Requirements” The additional insulation, reinforced insulation and grounding measures mentioned in the national standards are the main measures for household appliances to prevent consumers from electric shock. The additional insulation is an effective shielding to prevent the user from directly contacting the accidental charged metal parts, thereby protecting the user’s safety; the grounding is a metal part that is accessible to the consumer, and when accidentally becomes a live part, current flows into the earth, thereby protecting the use. There is no risk of electric shock.
In general, the additional insulation is waterproofing the dam, and the grounding is to clean the channel. The purpose is to protect the user’s life and property from damage. In this way, it is not difficult to understand the grounding effect of the metal parts in the household appliance. From this perspective, there is no dispute that the fan motor casing and the like should be grounded. The grounding of the best air purifier affordable fan motor housing is discussed below in the standard specific terms. problem.
Article 27.1 of GB 4706.1-2005 clearly states that in case of insulation failure, the accessible metal parts of Class 0I and Class I appliances that are electrically charged shall be permanently and reliably connected to a grounding terminal in the appliance or the grounding contact of the appliance input socket point.
The standard requirement means that the metal parts in the appliance that satisfy the following three conditions must be grounded.
1. Parts of Class 0I or Class I appliances;
2. Metal parts that are accessible to the user;
3. Insulation failure may become a metal part of a live part.
For the designer of the enterprise and the tester of the testing technology, according to the above three conditions, it can be determined whether the metal parts of the product should be grounded. The first two conditions of the three conditions are not difficult to understand, and the third insulation failure may become a live part. The insulation failure mentioned here refers to the failure of the basic insulation. The additional insulation and reinforced insulation in GB 4706.1-2005 are not allowed to fail. That is to say, the accessible metal parts separated from the live parts by additional insulation or reinforced insulation are not protected by grounding. It relies on insulation protection. It should be assessed whether the additional insulation or reinforced insulation meets the relevant provisions of the standard.
It is worth noting that some testers often impose their will on the products being tested during the test, regardless of whether the idea is correct or not. Whether the product meets the requirements should be based on the test results, that is, to find out the design or manufacturing problems through testing. Therefore, the tester should use the actual test result of the prototype as the basis for determining whether it is qualified. The grounding measures are reliable and effective, and the test confirmation of 27.2, 27.3, 27.4, and 27.5 is required. For the ungrounded accessible metal parts, the effectiveness of insulation between the live parts and the live parts should be evaluated. If the electrical strength and leakage current do not meet the standard requirements, it is judged as unqualified.
In short, to determine whether the grounding measures meet the standard requirements should be divided into two parts, first determine the correctness of the grounding system through visual inspection, and then determine the effectiveness and reliability of the grounding system through relevant tests.
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The quality of air quality reflects the degree of air pollution, which is judged by the concentration of pollutants in the air. Air pollutants include PM2.5 particulate pollutants, harmful viruses such as bacterial viruses, and chemical harmful gases such as formaldehyde and benzene. Under the smog siege, the air purifier remove smoke smell also became a hot item in 2014.
Some people think that air purifier to remove smoke odor are not needed in areas with good air quality, such as Hainan. This is actually a wrong understanding. In fact, in foreign countries, even in economically developed regions such as Europe, the United States, Japan and South Korea, because people have a strong sense of health, even if the air quality is very good, people generally use air purifiers to remove indoor air quality. It is precisely because the outdoor air quality is good, and people have long hours of indoor activities, indoor dust, pollen, second-hand smoke, animal dander, human body odor and other pollution, so the air purifier is more needed.
Therefore, the normal situation should be that light air purifiers can be used in areas with good air quality. In areas with poor air quality and complex pollutants, heavy duty air purifiers can be applied to deal with severe and complex pollution environments.
The bad air environment, the harm to the human body is self-evident, the home is placed in an air purifier, if the conditions can choose a negative ion air purifier to clean the indoor air is also very useful to reduce pollution The harm of air to the human body.
Air purifiers are not new in the market, large, small, quirky, intelligent… can be described as a variety of flowers. They may have a variety of advantages, but these air purifiers are only air purifiers. The single-function hardware can no longer be called smart. The reason why intelligence is called intelligence is its user-friendly design, convenient use process, worry-free automation and multi-functional convenience.
Knewbi, the newest plaything community in the country, combined with the leading industrial design brand Olansi and the professional air purification system engineering solution provider Jiaduo Net Technology, launched this in September 2014 – not just upgrading Breathing quality, “Olansi super smart air purifier” that can effectively improve the living environment.
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The quality of air quality reflects the degree of air pollution, which is judged by the concentration of pollutants in the air. Air pollutants include PM2.5 particulate pollutants, harmful viruses such as bacterial viruses, and chemical harmful gases such as formaldehyde and benzene. Under the smog siege, the air purifier also became a hot item in 2014.
Some people think that the best small room HEPA air purifier is not needed in areas with good air quality, such as Hainan. This is actually a wrong understanding. In fact, in foreign countries, even in economically developed regions such as Europe, the United States, Japan, and South Korea, because people have a strong sense of health, even if the air quality is very good, people generally use air purifiers to remove indoor air quality. It is precisely because the outdoor air quality is good, and people have long hours of indoor activities, indoor dust, pollen, second-hand smoke, animal dander, human body odor, and other pollution, so the best rated small room air purifiers are more needed.
Therefore, the normal situation should be that light air purifiers can be used in areas with good air quality. In areas with poor air quality and complex pollutants, heavy-duty air purifiers can be applied to deal with severe and complex pollution environments.
The bad air environment, the harm to the human body is self-evident, the home is placed in an air purifier, if the conditions can choose a negative ion air purifier to clean the indoor air is also very useful to reduce pollution The harm of air to the human body.
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The Ningbo market supervision department purchased different brands of best large room air purifiers and conducted a one-month comparative test. The experimental brand covers 20 batches of first-line brands currently sold in the domestic market, including domestic products of less than 1,000 yuan, and foreign brands with prices of nearly 10,000. Experiments show that in terms of PM2.5 purification, these brands with huge price differences actually have similar effects.
Detection method
In the PM2.5 test, the clean air volume (CADR) is the core performance indicator, which is also indicated in the best large room air purifier for pets.
Among the 20 batches of samples in this test, the measured CADR values of 14 products all reached the nominal value (according to the national standard, the measured CADR value reached 90% of the nominal value and reached the nominal value), and the effect was ideal.
An air purifier removes PM2.5 effect
It is the most concerned by many families.
A lot of publicity “removal rate is greater than 99%”
Can it really be done?
Experimental result
Most products have a PM2.5 removal rate of over 99%
△ Different brands PM2.5 removal rate (data from Ningbo City Market Supervision Bureau)
Experiments show that after 20 minutes of sample opening, the purification effect of PM2.5 is quite different. However, after one hour of opening, the PM2.5 purification effect is basically close. Among the 20 samples, except for the “Bigda” brand, the PM2.5 purification efficiency was 91.83%, and the rest of the brand purification efficiency exceeded 99%.
Use reminder
The particulate removal ability of the air purifier is not necessarily related to the price. For example, although the price of millet is low, the removal rate of PM2.5 is similar to that of other brands.
The PM2.5 problem that everyone cares about is solved.
Morning News can breathe freely
Is that effective in removing formaldehyde and removing bacteria?
Most air purifier manufacturers will rush to promote “de-formaldehyde”, “toluene”, “sterilization” and other functions, are these effects really exist?
In the market, not all air purifiers have this function. In the 20 batches of samples purchased in this consumer experience, there are 11 batches of air purifiers that purify the gaseous pollutants, accounting for 55%.
Taking formaldehyde as an example, after one hour of starting work, the formaldehyde purification rate of these 11 batches of products exceeded 80%. Among them, the purification rate of the three brands of Lake, Sharp, and Huiqing exceeded 95%.
In terms of sterilization, this experiment used Staphylococcus aureus as the target bacteria to detect the sterilization rate after opening the air purifier for 1 hour in the 30 cubic meters of experimental space. In the 20 batches, the sterilization rate marked with the sterilization function reached 99%.
Use reminder
The tester said that if the filter is only filtered and not specially treated to inhibit microbial growth, it will intercept the microorganisms without killing, and there may be microbial growth and secondary pollution, so in use, it should be timely Replace the filter.
Consumption reminder
An air purifier is not as expensive as possible
At present, there are various air purifiers on the market. What should you pay attention to when purchasing and using air purifiers? Air purifiers are not as expensive as possible, but you have to choose the one that suits you.
△The difference in performance and use cost of different brand air purifiers in the same price range
1. If there are no allergic people in the family, such as the elderly, children, patients with chronic respiratory diseases, allergies, etc., there is basically no need to buy; if you need to buy, you should also look at the main use, whether it is used to treat PM2.5 or to remove formaldehyde. Contaminants.
2. In order to achieve better purification effect, in the case of poor outdoor air quality, the air purifier should be used to minimize the opening of the window to reduce the introduction of new pollutants; if the room is too large, the CADR of the air purifier may not be sufficient. The interior forms an air circulation.
3. In order to ensure the purification effect, it is necessary to replace the corresponding filter materials in time to avoid secondary pollution caused by the pollution of excessive filter media.
4. The formaldehyde contained in the decoration materials or furniture is in a state of continuous release, and the release time can be up to several years. It is recommended to use the air purifier and open window to change the gas phase or try to choose relatively environmentally friendly. Decoration materials and furniture.
5. The function of the air purifier is to purify the indoor air. It does not have the function of oxygen production. Long-term use in a relatively confined space will result in low oxygen content in the environment and affect human health. Long-term use of air purifiers should pay attention to timely window ventilation.
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Every winter, PM2.5 is almost explosion in most parts of the North. On November 8, 2014, Shenyang, Liaoning Province even reached 1400 μg/m3. The government has called on the public to minimize outdoor activities. The highway was once closed due to smog. The dangers of smog can be seen.
It is in this environment that the air purification industry was detonated. Air purification products are mainly divided into two major categories: medium purification and electronic purification.
Media cleaning requires regular replacement of the filter, which is expensive to maintain at a later stage.
There are two kinds of electronic purification: electrostatic dust removal and micro static electricity. Electrostatic dust removal will produce ozone. For people who are often indoors, there will be certain harm; while micro-static will not produce ozone, and there is no need to change the filter regularly, and the maintenance cost is very low.
Aiyoute is a technology-based enterprise mainly based on micro-static. The slogan of Aiyoute is “can breathe deeply”. It not only purifies the air with high efficiency, but more importantly, it does not need to replace the filter. The maintenance cost is very low, and the product installation is also low. Very convenient. Beijing Benz Center is taking advantage of these micro-static advantages and signed a supply contract with Aiyoute.
In the future, the air purification industry will focus on user use and portability. Micro-electrostatic purification technology is a qualitative improvement for the field of air purification. It will surely break the existing technological monopoly of the traditional purification industry and achieve rapid growth.
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