Electric fan (electric fan)
Dieng, mt
An electric fan
Electric fans, also called electric fans, are used to dissipate heat. It is better to use them to cool down in summer, and they can also be used to disperse indoor heat.
The invention of electric fan
Who invented the electric fan? It is difficult to find relevant information now. It is said that 1882, Huey, chief technician of Croca Zhikazis engine factory in new york, USA? Skats？ Hoyla was the first person to invent the commercial electric fan. The next year, the factory began mass production. At that time, the electric fan was a desktop fan with only two blades.
1908, American ek engine electric company successfully developed the world's earliest gear-driven electric fan with left and right shaking heads. This kind of electric fan eliminates unnecessary 360-degree air supply and becomes the mainstream of future sales.
Working principle of electric fan
Rotor: composed of magnets, blades and shafts; Stator: composed of silicon steel sheet, spool and bearing; Control circuit: the N.S. pole of the IC induction magnet controls the conduction of its coil through the circuit to generate internal excitation and make the rotor rotate.
Types of electric fans
According to the motor structure, there are single-phase capacitive, single-phase shaded pole, three-phase induction, DC and AC/DC series commutator electric fans, which can be divided into household electric fans and industrial exhaust fans according to their uses.
Household electric fan
There are ceiling fans, desk fans, floor fans, wall fans and ceiling fans. 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.
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.
Use and maintenance of electric fan
1. Read the instructions carefully before use, and fully grasp the structure, performance, installation, use and maintenance methods and precautions of the electric fan.
2. Desktop and floor electric fans must use three-core plugs and sockets with safety grounding wires; The ceiling fan should be installed at a higher position on the ceiling without grounding wire.
3. The blades of electric fans are important parts, so they must be protected during installation, disassembly, scrubbing or use to prevent deformation.
4. When operating various function switches, buttons and knobs, the action should not be too fierce or too fast, nor should you press two buttons at the same time.
5. The ceiling fan speed control knob should rotate slowly and sequentially, not in the gear position, otherwise it will easily cause the ceiling fan to heat up and burn the machine.
6, electric fan with oil or dust, should be removed in time. Do not use gasoline or strong alkali solution to wipe, so as not to damage the function of surface paint parts.
7. If the electric fan is hot, abnormally burnt, shaking its head is invalid and its speed is slow, don't continue to use it. Cut off the power supply in time for maintenance.
8. Before collecting the electric fan, thoroughly remove the oil stains and dust on the surface, wipe it with a dry soft cloth, and then wrap it with kraft paper or clean cloth. The storage place should be dry and ventilated to avoid squeezing.
Novel and unique electric fan
Voice-activated electric fan
The voice-activated electric fan developed by General Electric Company of the United States is equipped with a micro electronic receiver. It only needs to clap your hands twice at a place no more than 3 meters, and the electric fan will run automatically. If you clap your hands three times in a row, the electric fan will stop running automatically.
Air cooled fan
A new type of electric fan that combines a fan with a refrigerator has been launched in the European market. The fan has a cooling core with mixed liquid in the central cylinder. The core can be taken out after 3 hours in the refrigerator, which can blow out cold air and give people the feeling of cold air blowing.
Noisy electric fan
Developed by Mitsubishi Corporation of Japan, this kind of electric fan has almost no noise, is equipped with special bird wing blades, can generate rotating airflow, and uses a DC motor without a protective cover. Very suitable for places with microcomputers, word processors and photocopiers.
Lamp cap electric fan
The electric fan invented in the United States can be installed on the lamp holder, which is small and exquisite, and can be used as long as there is a lamp holder installed. It is not only convenient to install, but also energy-saving.
Four seasons electric fan
The electric fan made in Germany can be used in all seasons, equipped with far infrared heater and negative ion generator. Cool air can be sent in summer, hot air can be sent in winter, and negative ion air can be sent all year round, which has the functions of refrigeration and heating, air purification, disease prevention and health care.
Matchbox electric fan
This miniature fan developed in France is only the size of a matchbox, with a thickness of 14mm, a length of 62 mm and a weight of only 45 grams. It uses 65,438+02 to 24 volts DC and two watts of power, and its continuous service life can reach 65,438+00,000 hours.
Fuzzy micro-control electric fan
This advanced electric fan introduced by Toshiba Company in Japan has seven levels of air volume, such as strong, medium and weak, and 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 rotating.
Finger protection electric fan
Robertson Industries has introduced two new fans. As long 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 rotating, so as to avoid finger injury.
Small electric fan
Suitable for going out in summer or when there are no cool tools around, there are many such fans, such as battery-powered, rechargeable and USB interface, which are also a good tool in summer.
Top ten brands of electric fans
1 midea electric fan (China famous brand, China famous trademark, national inspection-free product)
2 Gree electric fan (China well-known trademark, national inspection-free product)
Pioneer electric fan (China famous brand, national inspection-free product, Zhejiang famous brand)
4 Lianchuanglian electric fan (China famous brand, national inspection-free product)
5 Emmett electric fan (China famous brand, national inspection-free product)
6 New Diamond/Fujitsu electric fan (national inspection-free product, Guangdong famous brand)
Philips electric fan (world brand, one of the largest electronics companies in the world)
8 Haier electric fan (world brand)
9 Jinling electric fan (national inspection-free product)
10 diamond electric fan (national inspection-free product)
Selection of electric fan
Take a look at the random documents. The random documents of each electric fan include instruction manual, product certificate, electrical circuit diagram and packing list. Check the quantity and quality of parts according to the packing list when purchasing.
Second, see if the net cover and fan blades are obviously deformed. On the assembled fan net cover, touch the highest point of a fan blade with a pen and slowly move the fan blade. The corresponding points of other fans should be very close to the pen tip. Then turn the fan blades, and pay attention to whether the rotation is light and flexible and can stop at any position.
Third, see if the control mechanism is flexible. The control mechanism includes speed regulating switch, timing knob, vibration switch, lighting switch, etc. These control mechanisms should be flexible in operation and reliable in contact. For speed regulating gear, two gears are not allowed to be connected at the same time or one gear cannot be pressed down. Press the stop key, and all speed keys should be reset normally.
Fourth, look at the performance of moving parts. The fan head of the electric fan can operate flexibly at all angles and can be locked firmly. When the fan head is adjusted to the maximum depression angle or shakes its head to the final position, the net cover should not collide with the fan column. When the fan is running, it has good stability, will not topple, and the shaking angle shall not be less than 60-80 degrees.
Starting performance is an important quality index of electric fans. During the inspection, the electric fan should be set at a low speed. When the rated voltage of the power supply is 85%, that is, when the voltage of 220 volts drops to 187 volts through the voltage regulator, the electric fan should be started. The electric fan should be able to start from a static state and run normally. The shorter the time required for the electric fan to start normal operation, the better the starting performance of the fan motor.
Sixth, look at the operation and speed regulation performance. After electrifying, turn the rocker switch back and forth several times to check whether there is a fault or the assembly is too tight. In this process, there should be no abnormal noise in the mechanical transmission part of the fan. When the electric fan is running at high, medium and low speed, the motor and blades should be stable, with little vibration and low noise. The fan should shake its head and stop quickly, without intermittence, stagnation and jitter, and the speed difference of each gear should be obvious. The larger the air supply angle, the better. When the electric fan stops running, the axial clearance of the rotating shaft should not exceed 0.5cm. Excessive clearance will cause axial movement and impact sound during operation.
Seventh, see if there is a strong numbness when the leakage fan is energized. If the electric probe is used for testing, the electric probe will also emit light, so it can be judged that the casing is leaking and cannot be selected.
Eight, look at the continuous operation performance of electric fans. After the electric fan runs continuously for 2 hours, if the surface of the nose shell is hot, it means that the temperature is too high to choose. Under normal circumstances, the surface temperature of the nose shell is below 50℃, so it won't feel very hot.