Talking about air purifier fan motor housing grounding

Talking about air purifier fan motor housing grounding

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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Why do new air-conditioned units need to be installed in newly renovated houses?

Why do new air-conditioned units need to be installed in newly renovated houses?

Which families need to install a professional best affordable air purifier for smoke.

1. I feel so depressed and even dizzy when I get up every day. I still want to sleep and my limbs are weak.

2. Family members are often prone to catch a cold.

3. I often feel uncomfortable and poorly breathing.

4. Children often cough and have low immunity.

5. There are often family members with allergies.

6. Newlyweds have long been infertile and cannot find the cause.

7. Pregnant women are prone to miscarriage and cannot find the cause.

8. Family members have a disease.

9. Newly moved or newly renovated or pungent and pungent.

10. In the normal condition of the couple’s physical examination, the pregnant woman has a fetal malformation.

11. There are smokers in the family, or there are frequent guests in the family.

12. Long-term living in a busy downtown area (especially close to the road).

13. The home is decorated with marble.

14. Long-term residence in a house near the factory.

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How to use the air purifier

How to use the air purifier

Proper use of the best affordable air purifier for allergies not only improves the efficiency of air purification but also prolongs the service life of the air purifier, with less effort. Let’s take a look at how air purifiers use old air purifiers.

Placement position

The placement of the best affordable air purifier for smoke is exquisite, but it is not metaphysical.
Reserve a space of at least 30 cm for the air purifier to facilitate air circulation.
Remember not to put it on the wall! Don’t put it on the wall! Don’t put it on the wall! In particular, the side with the sensor will affect the air purifier’s detection of air quality.

2. Open the window at the right time

Close the doors and windows when opening the air purifier. If the polluted air outside the room continues to enter the room, it will seriously affect the purification effect of the air purifier.

However, when closing the air purification of doors and windows, you should also open the window at the same time.

* National standards stipulate that 30 cubic meters of fresh air are required per hour. In the use scenario of the air purifier: exchange air with the outside world 0.5-1 times per hour.

3. “Maintenance and maintenance” is very important

The air filter’s primary filter needs to be cleaned regularly. It is recommended to clean it once at least 1 month. The X80/X83 series air purifier’s primary filter can be taken out directly and can be washed (as shown in the figure above).

Because the X50 air purifier uses a composite filter element, it is necessary to use a brush or a vacuum cleaner to clean the outer layer of hair and dust, and not to wash. By the way, the X50 air purifier has a filter cleaning reminder function. After cleaning, press and hold the light button to turn off the prompt.

Negative example

For HEPA and activated carbon layer filter is a consumable, can be replaced directly after expiration.

4. Other details

Air Purifier’s “Child Lock” function

If you find that the machine is powered on, the button suddenly does not respond. In most cases, the “child lock” protection function is enabled. Press and hold the “child lock button” to release.

The air purifier is not a “hood hood”

The kitchen produces more serious air pollution. Many people have this experience: when cooking in the kitchen, the air purifier in the living room suddenly runs at a speed. But please do not put the purifier directly into the kitchen to purify, the oil fumes are still handed over to a more professional range hood.

Air purifier and “ultrasonic humidifier”

A lot of user feedback: in the case of closing the doors and windows, the index of the air purifier does not fall back.
In most cases, it is caused by the “ultrasonic humidifier”.

The “ultrasonic” humidifier works by converting water into vapor-type aerosol particles through high-frequency oscillations, and PM2.5 is essentially an aerosol particle. The detection technology used in current portable testing equipment cannot effectively distinguish between vapor-type aerosol particles and harmful aerosol particles (PM2.5). The mist sprayed from the humidifier will be mistaken for PM2.5. A thermal evaporative humidifier is recommended.

“laser sensor” for air purifier

If the air purifier’s sensor is blocked by dust, it will affect the air purifier’s air quality detection. At this time, the sensor can be wiped with a cotton swab. The life of the laser sensor needs to be renewed after its expiration. The laser sensor of the 352 air purifier is detachable and can be completed by yourself.

Air Purifier VS “Second-hand smoke”

As we all know, second-hand smoke is extremely harmful, and the taste of second-hand smoke is also difficult to remove. If the purifier is purchased purely to remove second-hand smoke, this is obviously not sensible, so that the filter element of the air purifier is extremely saturated. Instead of opening the air purifier, it is better to open the window and ventilate it. Of course, the most fundamental thing is to ask smokers at home not to smoke indoors (and public relations).

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Experts advise: air purifiers are not as functional as possible

Experts advise: air purifiers are not as functional as possible

Recently, many places have experienced severe haze, and air purifiers have become the focus of consumers’ attention. Experts advise that the best affordable air purifier for smoke is not as functional as possible.
Recently, reporters learned in-home appliance stores and some online shopping malls that many brands of best air purifier affordable claim to have functions such as formaldehyde removal and humidification. Some clerk of home appliance store told reporters that the humidification function is very helpful for air purification, and water vapor can help absorb harmful substances in the air.
Liu Zhang, an associate professor at the School of Environmental Engineering and Science at Peking University, said that the choice of an air purifier depends on the basic functions marked by the purifier itself, and there is no need to choose a product that has been versatile. For example, during the sputum pollution in Beijing, it is mainly contaminated by fine particles and contaminated with organic matter. Therefore, when selecting an air purifier, as long as the purifier achieves the indicators of pollutants (fine particles and organic matter) and fresh air volume, can.
Liu Zhaorong said that the functions of temperature and humidity adjustment are to meet physical comfort. There is no experimental data indicating that it has sufficient correlation with air purification. Liu Wei, the attending physician of the Department of Respiratory Medicine of the First Hospital of Jilin University, said that if the air purifier with humidification function is not properly operated, it will easily breed bacteria in the water and affect the health of the body.
Experts reminded that in addition to paying attention to the basic functions when purchasing an air purifier, attention should be paid to the applicable area of ​​the purifier to match the use environment to avoid the effect of the “small horse-drawn cart”.
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