Brief introduction of electric fan working principle of electric fan How to choose common faults and maintenance precautions of electric fan What brand of electric fan is good 1 Brief introduction of electric fan, also known as fan and electric fan, is a household appliance that uses motor to drive fan blades to rotate, thus accelerating air circulation, and is mainly used for cooling summer and circulating air. Widely used in homes, classrooms, offices, shops, hospitals and hotels.
The electric fan is mainly composed of fan head, blades, mesh cover and control device. The fan head comprises a motor, a front end cover, a rear end cover and a shaking head air supply mechanism. The main components of the electric fan are: AC motor. Its working principle is that the electrified coil is forced to rotate in the magnetic field. When electric energy is converted into mechanical energy, due to the existence of coil resistance, it is inevitable that some electric energy will be converted into heat energy.
Common household electric fans are essentially axial fans, that is, the direction of the wind is parallel to the rotation axis of the fan blades.
2 The working principle of the electric fan The main components of the electric fan are: AC motor. Its working principle is that the electrified coil is forced to rotate in the magnetic field. The conversion form of energy is: electric energy is mainly converted into mechanical energy, and at the same time, due to the resistance of the coil, some electric energy will inevitably be converted into internal energy.
Can the electric fan reduce the indoor temperature after working? The indoor temperature has not decreased, but will increase. The reason why the temperature rises is that when the electric fan is working, because there is current passing through the coil of the electric fan and the wires are resistive, it will inevitably generate heat and release heat, so the temperature will rise. But why do people feel cold? Because there is a lot of sweat on the surface of human body, indoor air will flow when the electric fan works, so it can promote the rapid evaporation of sweat, and "evaporation needs to absorb a lot of heat", people will feel cool.
3 Types of electric fans Electric fans have been widely used in every family because of their small size, energy saving, health and environmental protection. Due to the different family environment, various types of electric fans have been extended to adapt to the use of every family. At present, the market can be divided into six categories: desk fans, floor fans, ceiling fans, wall fans, air-conditioning fans and leafless fans. So what kind of fan is suitable for us? Today, Bian Xiao will introduce it to you.
Common and simple classification of electric fans
Ceiling fan, wall fan
Advantages: no floor space, large air volume and adjustable.
Disadvantages: immobile, difficult to clean, need to be installed.
Desk fan, floor fan
Advantages: convenient movement, small occupied space and convenient cleaning.
Disadvantages: it takes up space and is not safe for children.
Evaporative air cooler
Advantages: convenient movement, small temperature drop and small occupied space.
Disadvantages: it takes up space and is not easy to clean.
Vaneless fan
Advantages: convenient movement, safety and small space occupation.
Disadvantages: small air volume
From the advantages and disadvantages of the above types of electric fans, it can be seen that ceiling fans and wall hanging are suitable for users who don't pay attention to the pattern, such as elderly users; Desk fans and floor fans are suitable for ordinary families without children; Air conditioning fans and sleepless fans are suitable for foreigners and families with children.
Certain types of electric fans
1. According to the motor structure, it can be divided into single-phase capacitive, single-phase shaded pole, three-phase induction, DC and AC/DC series commutator fans.
2, according to the purpose of classification can be divided into:
(1) Household electric fans: ceiling fans, desk fans, floor fans, wall fans, ceiling fans, ventilation fans, box fans, air-conditioning fans (i.e. air coolers), etc. There are table fans that shake their heads, and there are also box fans; Some floor fans shake their heads and turn pages. There is also a small wind electric fan, which is specially hung in the mosquito net. When you sleep at night in summer, the breeze blows gently as soon as you turn it on, so that you can sleep well and not get sick.
(2) Industrial exhaust fan: mainly used for forced air convection. After the electric fan is used for a long time, it is easy to get a lot of dust under the fan blades. This is because when the electric fan is working, the blades are charged with static electricity due to friction with air, and charged objects can attract light and small objects, thus absorbing the fine dust floating indoors. Details >>
4 How to choose an electric fan In the hot summer, an electric fan is a must-have at home. Even if you have air conditioning, you still need a fan suitable for cooling in summer and protecting the environment. How to choose the brand of electric fan?
1, the air volume of the electric fan is directly related to the size of blades and the diameter of the fan. If you want to be cool, it is right to use a larger fan.
2. The heart of the fan is the motor. When buying, it should be no problem to buy famous brands. Don't buy anything too miscellaneous. If the motor burns, it will not be worth the loss.
3. The noise of electric fans is generally 30 ~ 65 decibels, and the noise during sleep is suggested to be 35~50 decibels. When choosing, the store is generally noisy and can't hear clearly. For domestic fans, choose a "sleep style". Now many fans have this function, and the outlet of this gear is softer and more comfortable.
4. The stability of the fan is good when it is running, and it will not be dumped. The shaking angle should not be less than 60-80 degrees. The tower fan even has a 360-degree flip function, which is more comfortable to use.
5, timing function is very important, the current fan is usually 8 hours or 12 hours timing, suitable for use at night. In fact, this is more practical than the remote control function.
6. Regarding the negative ion function, the negative ion function fan which can not only remove dust and inhibit bacteria, but also purify the air is still worth recommending, because it is equivalent to a small ecosystem and can bring a more comfortable sense of forest.
7. The tower fan is both beautiful and space-saving. If you consider buying, you should pay attention to whether there is a lifting function, because if the height is not suitable, it will affect the coolness and comfort.
8. If there are old people and children at home, it is best not to use an air-conditioning fan, because it is actually an electric fan with a water-cooling device, and the air outlet is easy to breed bacteria, which will be blown into the air with the cold wind; In addition, people with excessive humidity and poor immunity are prone to skin diseases such as eczema and allergic dermatitis. If there are families with rheumatic patients and pregnant women, it is best not to use them. If you must use it, change the water frequently, preferably pure water, and clean it once every two weeks. Might as well add a dehumidifier.
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Why does the fan make a lot of noise?
Cause analysis: 1. Fan blade deformation or motor failure; 2. The turntable motor fails or there are sundries on the raceway; 3. The transformer/magnetron is poorly fixed; 4. The transformer/magnetron itself is unqualified. Solution: Look at the possible reasons.
Why can't the fan be powered on?
Cause analysis: 1. Power failure; 2. Burn insurance; 3. The temperature control switch is broken; 4. Transformer/high voltage diode/time power distributor/magnetron wiring is loose or damaged; 5. The voltage is lower than 187V, so it cannot be started. Solution: Check the power supply, fuses, components and wiring of each main loop.
What is the reason for the low battery?
Cause analysis: 1. Low voltage; 2. The magnetron is unqualified; 3. Bad power distribution time. Solution: Check the voltage or replace the magnetron and distributor.
What's with the periodic downtime?
Cause analysis: 1. The motor is damaged or the speed is lower than 800 l/min; The thermostat is broken. Solution: Replace the thermostat or fan motor.
Why is there no microwave power output after electrifying?
Cause analysis: 1. The time when the distributor is disconnected (the contacts are not in contact); 2. The interlock switch is off (microswitch); The magnetron is broken. Solution: Check or replace each component.
How to repair the broken electric fan?
Cause analysis: The power of the electric fan swing mechanism comes from the worm at the rear end of the motor shaft, which drives the four-bar linkage to swing back and forth through two-stage speed change. Shake your head failure is mainly divided into two situations: not shaking your head and shaking your head.
Solution: 1 One of the reasons for not shaking your head is that shaking your head is blocked, which is caused by the deformation and bending of the connecting rod. At this time, there will be a bang, and the deformed connecting rod can be removed and taken out after shaping; Second, the transmission is out of order, so that the power cannot be transmitted. Can check the rack bar, swing plate, gear box, clutch, etc. If it is found that there are phenomena such as falling off, foreign objects stuck, and serious wear and tear, it is necessary to eliminate or replace the lost parts.
Solution: 2. Shaking the head is mainly caused by the breakage or looseness of the wire rope in the remote control clutch or shaking control device. If the steel wire breaks, a new steel wire flexible shaft can be replaced. If the tie head is loose, just re-fix the metal head of the casing.
6 precautions for the use of electric fans Electric fans are the main heatstroke prevention and cooling equipment for many people in summer. However, some people use electric fans improperly, which brings harm to health, such as cold, facial paralysis, scapulohumeral periarthritis, backache and so on.
Blow for a long time
Many people like to blow electric fans for a long time. They will stop when they feel cold, and they will feel hot. Might as well blow them for a long time. However, if you blow on the electric fan for a long time, the temperature of the human body will drop with the evaporation of a lot of sweat, which may easily cause colds, colds, abdominal pain, diarrhea and other diseases. Generally, it is appropriate to blow for half an hour to 1 hour at a time.
High speed blowing
In order to cool down as soon as possible, some people turn on the electric fan to the highest speed, thinking that a strong wind is enough to reduce the fever. This is an inappropriate practice. When the temperature exceeds 30℃, the air temperature is close to the normal body temperature, and the wind from the electric fan is also high temperature wind. At this time, the body's heat mainly depends on the evaporation of sweat. If the electric fan blows too much, the skin surface temperature drops, the pores are blocked, and the sweat inside the body can't be emitted, you will feel hot, and fatigue, backache and backache will occur at the same time. This is the so-called "sweat suppression". Therefore, it is not suitable to use electric fans for high-grade high-speed blowing, and it should be adjusted to medium or low speed, and it is better to blow breeze.
Blow near wind
Don't put the electric fan near your body. If a strong wind blows nearby and only blows on one side of the body, the skin sweat on the windy side will evaporate rapidly and the temperature will drop obviously, while the sweat on the windless side will evaporate slowly, resulting in a large gap between blood circulation and sweat excretion on both sides of the body, and the nerve center will lose balance. Once the time is too long, all organs will be exhausted and feel unwell. Therefore, when blowing an electric fan, it is best to keep a distance of 2 meters from people, so that the wind blown out is even and soft.
Blow directional wind
At present, most electric fans are shaking heads. When blowing, the electric fan constantly moves its position and direction, and the blowing becomes bigger and smaller, so that the wind on the body surface slows down, people will not feel too cold, and the whole body temperature is uniform. Therefore, it is best to use a rocking fan instead of blowing directional wind.
Sleep and blow
That is, use an electric fan to cool down and sleep. When people are asleep, the functions of various organs of the body are reduced to the lowest level, all reflexes disappear, and immunity is reduced, which is easy to cause diseases.
The biggest misunderstanding in the use of electric fans-start the slow gear first
When starting the electric fan, many people are used to starting from the slow gear, thinking that it saves electricity. Actually, it's just the opposite.
When starting in low gear, the voltage of 220 volts is reduced by the governor and added to the motor. The starting current is very large, and the motor is prone to heat, which is not conducive to the service life. Although the design of electric fan has taken into account the need of speed regulation, it is obviously unfavorable to the motor. If you start from the fast gear first, the motor will start with enough force and the temperature rise of the motor will be small. Obviously, it is very beneficial to save electric energy and prolong the service life of motor and governor. Therefore, when starting the electric fan, it is best to use the fast gear first, and then adjust it to the slow gear after the speed is normal.
How to use electric fans correctly in summer
On a hot summer day, it's very pleasant to turn on the electric fan and the breeze blows on your face. But many people get sick because of improper use of electric fans. The reason is that many people lack common sense in using electric fans.
Some people are too eager to be cool, so they put the electric fan close to their bodies and keep blowing for a long time. In this way, the sweat on the side that can blow to the wind evaporates quickly, and the body surface temperature drops obviously. On the unexposed side, sweat evaporates slowly, the skin temperature is relatively high, and the blood vessels on the body surface are still in a relaxed state, which eventually leads to imbalance of blood circulation and uneven sweat excretion, which may cause headaches, dizziness, general discomfort and other symptoms, which are serious. When some people are too hot to sweat, they suddenly blow with an electric fan, which is easy to cause a cold; If you still blow an electric fan when you sleep, it is easy to cause a cold.
First, the wind speed should not be too high: Modern science believes that the indoor wind speed should be controlled at 0.2-0.5 m/s, especially in well-ventilated rooms and places with through flow, and the wind speed of electric fans should not be too high.
Second, it is not appropriate to blow directly at people: direct blowing, common cold is easy to invade the body, especially when the body is weak or sweating, it is best to let the electric fan blow at a corner;
Third, the electric fan should be stopped, and it is advisable to use a swinging electric fan. For children, the elderly and the infirm, it is more appropriate to use electric fans to blow less, because "evil places must be qi-deficient", but electric fans can be used to adjust indoor airflow to indirectly cool down.
Fourth, pay attention to when sweating a lot, don't blow air immediately while sitting or lying still, because at this time, the blood vessels on the surface of the whole body are dilated and suddenly blown by the cool wind, which often causes the blood vessels to contract and the perspiration stops immediately, thus making the heat generation and heat dissipation in the body out of balance, and the excess heat cannot be discharged from the body;
5. After the cool breeze blows, the local defense function declines, and the invasion of viruses and bacteria can cause upper respiratory tract infection, muscle and joint pain, and some even abdominal pain and diarrhea. In a word, you must pay attention to the method of using electric fans, otherwise good things will turn into bad things, which is not conducive to your health.
The fan is used with the air conditioner.
Because the fan can directly convert electric energy into kinetic energy, the power consumption is very low, and the highest power is only 60W, which is equivalent to the power consumption of ordinary lighting table lamps. Therefore, from the perspective of energy saving, using fans in midsummer is undoubtedly the best choice. The fan is used with the air conditioner, and the temperature of the air conditioner is set at 26 -28 degrees, which saves electricity and money.
Try to use mid-range or low gear.
As far as the use of the fan itself is concerned, fans with large blades generally have large electric power and consume a lot of electric energy. The power consumption of electric fan is proportional to the rotating speed of blades. For example, a 400 mm electric fan consumes 60W when used in fast gear and only 40W when used in slow gear. The power consumption difference between the fastest gear and the slowest gear of the same electric fan is 40%, and the power consumption of the fast gear 1 hour can be nearly 2% in the slow gear. Usually, the fast gear can be turned on first, and then the slow gear can be used to reduce the power consumption of the electric fan after cooling.
7 What brand of electric fan is a good recommended brand in the industry? Midea Aimeite Dyson Dyson Pioneer Electrics Haier Aucma Meiling Mijia Royalstar Small Household Appliances