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General Knowledge of Electric Fans

Electric fans, also known as fans and fans, are household appliances that use motors to drive fan blades to rotate to speed up the flow of air. They are mainly used for cooling, relieving heat and ventilating air. It is widely used in homes, classrooms, offices, shops, hospitals and hotels.
The fan is mainly composed of fan head, blade, mesh cover and control device. The fan head includes motor, front and rear end covers and shaking head air supply mechanism. The main components of electric fan are: AC motor. Its working principle is that the electrified coil rotates under the force of the magnetic field. Electric energy is converted into mechanical energy, and at the same time, because of coil resistance, it is inevitable that part of the electric energy will be converted into thermal energy.
Common household electric fans are essentially axial-flow fans, that is, the direction of the wind is parallel to the rotating axis of the fan blade.
Working principle
The main components of electric fan are: AC motor. Its working principle is that the electrified coil rotates under the force of the magnetic field. Electric energy is converted into mechanical energy, and at the same time, because of coil resistance, it is inevitable that part of the electric energy will be converted into thermal energy. In addition, DC motor, brushless DC motor and other low-power motor in small fans are also more and more widely used.
When the electric fan works (assuming there is no heat transfer between the room and the outside), the indoor temperature does not decrease, but increases. To analyze the reasons for the temperature rise: when the fan works, because there is electric current through the fan coil, the conductor is resistive, so it will inevitably generate heat to exothermic, the temperature will naturally rise. But why do people feel cool? Because there is a lot of sweat on the body surface, when the electric fan works, indoor air will flow, so it can promote the rapid evaporation of sweat, combined with "evaporation needs to absorb a lot of heat", so people will feel cool.
type
Time-controlled electric fan
Just set the working time of the fan, it will turn on and off on time according to your settings.
Acoustically Controlled Electric Fan
General Electric Corporation developed this kind of acoustic electric fan with micro-electronic receivers. It only needs to clap hands two times in less than 3 meters, and the fan will automatically run. If clapping hands three times in a row, the fan will automatically stop running.
Air-conditioned fan
A new type of electric fan which combines fan and refrigerator has been introduced in European market. The fan has a refrigeration core. There is mixed liquid in the central cylinder of the core. When the core is placed in the refrigerator for 3 hours, the cold air can be blown out to give people the feeling of cold air blowing.
Noise-free electric fan
Mitsubishi Corporation of Japan developed this kind of noise-free electric fan, equipped with specially designed bird-wing blades, which can produce a whirling air flow, and uses DC motor without protective cover. It is very suitable for use in places with microcomputers, word processors and photocopiers.
Lamp-head electric fan
The electric fan invented in the United States, which can be installed on the bulb lamp head, is small and exquisite. It can be used as long as there is a lamp head installed with the bulb. It is not only easy to install, but also can save energy.
Four Seasons Electric Fan
The electric fan produced in Germany is equipped with far infrared heater and negative ion generator. It can supply cool air in summer, hot air in winter and negative ion air in all seasons of the year. It has the functions of cooling and heating, purifying air and preventing diseases and health care.
Matchbox Fan
This miniature fan, developed in France, has the size of a matchbox, a thickness of 14 mm, a length of 62 mm and a weight of only 45 grams. It uses 12 to 24 volts of direct current and two watt power. Its continuous service life can reach 10,000 hours.
Fuzzy Microcontrol Electric Fan
Toshiba's advanced electric fan is equipped with strong, ordinary and weak 7-Stage air flow. It can automatically select the best air supply according to the temperature and humidity measured by the sensor. If someone touches the net cover, it will automatically stop turning.
Injury-proof finger electric fan
Robertson Industries Inc. has introduced two new types of fans. As soon as a person's finger touches the cover of the fan, it will send an electric pulse signal to its control system to stop the fan from turning so as to avoid finger injury.
Small electric fan
It is suitable for summer outings or when there are no cooling tools around, this kind of fan has a lot of useful batteries, charging, USB interface, in summer is also a good tool.
Metal Fan
Metal fans, also known as metal fans, metal electric fans, means that the manufacturing materials of electric fans are metals, such as iron and copper. In developed countries in Europe and the United States, metal fans have become high-grade home decorations with their unique artistic charm and metal texture, and are welcomed and loved by consumers. This trend has been brought to China by the healthy and livable, and is affecting more and more families.
Common failures
1. The fan shaft part is to ensure that there is lubricant, otherwise the fan blade on the above motive can not be dragged. If you are at home, you can choose to turn off the power supply, and then move the wind blade, if the rotation is rigid, basically there is no lubricant.
2. Wear and tear caused by prolonged use. If a fan is used for a long time, the motor will be damaged and the sleeve of the motor will burn easily after wear and tear.
3. The fan does not turn due to overheating. There is a motor in the fan device. There will be an overheated circuit breaker in the motor. If there is a short circuit in the coil winding, the heat will increase in a short time. In this case, the motor will "strike" and not move.
4. Start capacitance decreases. When the fan is used for a long time, the capacitance capacity will be reduced, resulting in a smaller starting torque of the motor, unable to drive the load.
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