Electric fan
Electric fan (electric fan)
diàn shàn
1.an electric fan
electric fan Fans, also known as electric fans, are used to dissipate heat. They are good for cooling in summer and can also be used to dissipate indoor heat.
The invention of the electric fan
It is difficult to find relevant information about who invented the electric fan. It is said that in 1882, Huey Skatz Hoila, the chief technician of the Crokazikas Engine Factory in New York, USA, invented the first commercial electric fan. The next year, the factory began mass production. The electric fan at that time was a desktop electric fan with only two blades.
In 1908, the Ecker Engine and Electric Company in the United States successfully developed the world's earliest gear-driven electric fan that oscillates left and right. This kind of electric fan prevents unnecessary 360-degree rotation to supply air, and has become the mainstream of sales in the future.
The working principle of the electric fan
Rotor: composed of magnets, fan blades and shafts; stator: composed of silicon steel sheets, bobbins and bearings; control circuit: composed of IC induction magnet N.S. poles The circuit controls the conduction of its coil to generate internal excitation to rotate the rotor.
Types of electric fans
According to the structural form of the motor: there are single-phase capacitive type, single-phase shaded pole type, three-phase induction type, DC and AC-DC dual-purpose series excited Commutator-type electric fans can be divided into household electric fans and industrial exhaust fans according to their uses.
Household electric fans
There are ceiling fans, table fans, floor fans, wall fans, ceiling fans, etc.; there are table fans that shake their heads and those that do not. Page turning fans; floor fans include those that shake their heads and turn pages. There is also a small breeze fan, which is specially hung in the mosquito net. When you sleep at night in summer, the breeze will blow as soon as you turn it on, so you can sleep peacefully without getting sick.
Industrial exhaust fans
are mainly used for forced air convection. After using an electric fan for a long time, it is easy for a lot of dust to accumulate on the underside of the fan blades. This is caused by the friction between the fan blades and the air when the electric fan is working. The fan blades are charged with static electricity. The charged objects can attract light and small objects, thereby absorbing the fine dust floating in the room.
Use and maintenance of electric fans
1. Before use, you should read the instruction manual in detail and fully understand the structure, performance, installation, use and maintenance methods and precautions of the electric fan.
2. Desktop and floor-standing electric fans must use three-core plugs and sockets with safety grounding wires; ceiling fans should be installed at a higher position on the ceiling, and no grounding wire is required.
3. The blades of electric fans are important components. They must be protected to prevent deformation whether during installation, disassembly, scrubbing or use.
4. When operating various function switches, buttons, and knobs, do not move too hard or too fast, nor can you press two buttons at the same time.
5. The ceiling fan speed knob should be rotated slowly and sequentially, and should not be rotated in the gear position, otherwise it will easily cause the ceiling fan to heat up and burn out.
6. Oil stains or dust accumulation on the electric fan should be removed in time. Do not use gasoline or strong alkali to wipe, so as not to damage the function of the surface painted parts.
7. If the electric fan is hot to your hands, has an unusual burnt smell, has an inoperable shaking head, or slows down its speed during use, do not continue to use it and cut off the power supply in time for maintenance.
8. Before storing the fan, the surface oil and dust should be thoroughly removed, wiped clean with a dry soft cloth, and then wrapped in kraft paper or a clean cloth. The storage location should be dry and ventilated to avoid squeezing.
Novel and unique electric fan
Voice-controlled electric fan
This voice-controlled electric fan developed by the American General Electric Company is equipped with a miniature electronic receiver. If you clap your hands twice in a row at a distance of no more than 3 meters, the fan will automatically run; if you clap your hands three times in a row, the fan will automatically stop.
Air-conditioning electric fan
A new type of electric fan that combines a fan with a refrigerator has been launched on the European market. The fan has a refrigeration movement, and there is a mixture in the central cylinder of the movement. Liquid, put this movement in the refrigerator for 3 hours and then take it out for use. Then the cold air can be blown out, giving people the feeling of cold air blowing.
Noiseless Electric Fan
This almost noiseless electric fan developed by Japan's Mitsubishi Company is equipped with special bird-wing-shaped blades that can generate a vortex airflow, and It uses a DC motor without a protective cover and is very suitable for use in places with microcomputers, word processors, and copiers.
Lamp head electric fan
This kind of electric fan invented in the United States that can be installed on the light bulb head is small and exquisite. It can be used as long as there is a lamp head to install the light bulb. It is not only easy to install, but also can Save energy.
Four-season electric fan
This electric fan produced in Germany can be used in all seasons. It is equipped with a far-infrared heater and a negative ion generator, which can provide cool breeze in summer and cool breeze in winter. Hot air delivers negative ion wind all year round, which has the functions of cooling and heating, purifying the air, and preventing diseases and health care.
Matchbox Electric Fan
This miniature fan developed in France is only the size of a matchbox, with a thickness of 14 mm, a length of 62 mm, and a weight of only 45 grams. 12 to 24 volts DC, two watts of power, with a continuous service life of up to 10,000 hours.
Fuzzy micro-controlled electric fan
This advanced electric fan launched by Japan's Toshiba Corporation has seven levels of air volume, including strong, normal and weak. It can measure the temperature and humidity based on the sensor. , automatically selects the best air supply. If someone touches the grille, it will automatically stop rotating.
Anti-finger electric fans
Robertson Industries of the United States has launched two new types of fans. As soon as a person’s finger touches the outer cover of the fan, a signal will be transmitted to the control system. The electrical pulse signal causes the fan to stop rotating to avoid finger injury.
Small electric fans
Suitable for going out in the summer or when there are no cooling tools around. There are many such fans, with batteries, rechargeable, and USB interfaces. In the summer It is also a good tool
Ranking of the top ten brands of electric fans
1 Midea electric fan (Chinese famous brand, Chinese well-known trademark, national inspection-free product)
2 Gree electric fan (China's well-known trademark, national inspection-free product)
3 Pioneer electric fan (Chinese famous brand, national inspection-free product, Zhejiang famous brand)
4 Lianchuang LIAN electric fan (Chinese famous brand , national inspection-free product)
5 Airmate electric fan (Chinese famous brand, national inspection-free product)
6 Xinzuan/Fujibao electric fan (national inspection-free product, Guangdong famous brand)
7 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 products)
10 Diamond electric fans (national inspection-free products)
Purchasing of electric fans
A look at the random documents The random documents of each electric fan include usage Instructions, product certificates, electrical circuit diagrams and packing lists. When purchasing, you must check and check the quantity and quality of parts according to the packing list.
Second, check whether the grille and fan blades are obviously deformed. On the assembled electric fan grille, point a pen at the highest point of a fan blade, slowly move the fan blades, and move the other fan blades. The distance between the corresponding point and the tip of the pen should be very close. Then rotate the fan blade and observe whether the rotation is light and flexible and it can stop at any position.
3. Check whether the control mechanism is flexible. Control mechanisms include speed switches, timing knobs, rocking switches, lighting switches, etc. These control mechanisms should be flexible in operation and reliable in contact. For speed-adjustable gears, it is not allowed to have two gears turned on at the same time or one gear unable to be pressed down. Press the stop button and each speed gear button should be reset normally.
Four. Look at the performance of the movable parts. The fan head of the electric fan can operate flexibly at various angles of pitch and tilt, and is locked securely. When adjusted to the maximum pitch angle or moving the head to the final position, the grille must not collide with the fan support. When the fan is running, the stability must be good, it must not tip over, and the shaking angle should not be lower than 60-80 degrees.
5. Look at the starting performance. The starting performance is an important quality indicator of the electric fan. During the inspection, it should be adjusted to the slow speed and start the electric fan when the rated voltage of the power supply is 85%, that is, use the voltage regulator to reduce the voltage from 220 volts to 187 volts. The electric phoenix fan should be able to start from a standstill and operate normally. The shorter the time it takes for an electric fan to start running normally, the better the fan motor's starting performance will be.
6. Check the operation and speed regulation performance. After powering on, turn the toggle switch back and forth several times to check whether it is malfunctioning or the assembly is too tight. During 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 or low speed, the motor and fan blades should be stable, have small vibration and low noise. The fan should shake and stop quickly without interruption, stagnation or jitter. The speed difference between each gear should be obvious. The larger the air supply angle, the better. When the fan is stopped, the axial gap of the rotating shaft does not exceed 0.5 cm. If the gap is too large, it will cause axial movement and impact sounds during operation.
7. Check whether there is electric leakage. After the electric fan is powered on, if there is a strong numbness when touched by hand, use a test pen to test it. The test pen will also glow and display, which can determine that the shell is leaking and cannot be used.
8. Check the continuous operation performance of the electric fan. After the electric fan has been running continuously for 2 hours, if the surface of the machine head shell is hot to the touch, it means that the temperature is too high and cannot be used. Under normal circumstances, the surface temperature of the machine head shell is below 50°C and will not feel very hot.