This kind of electric fan prevents unnecessary 360-degree air supply and soon becomes the mainstream of future sales. Perhaps many adults and the elderly will remember this kind of electric fan.
Fans spread to China shortly after their birth. According to records, from 65438 to 0897, Tianjin Lishunde Hotel imported a high-power generator from Europe and used it to drive an electric fan, which may be the earliest "electric fan" in China.
1906, USA Shen Changyang set up a factory in Yangshupu to produce electric fans. Subsequently, European and American household appliances flooded into China and other big cities, and the electric fans on the market were mainly imported brands produced by General Electric Company of the United States.
The person who made the first electric fan in China was neither an electrical expert nor a senior engineer, but an ordinary bookkeeper, namely Mr. Yang Jichuan (188 1- 1952).
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Working principle of 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 heat energy.
When the electric fan is working (assuming that there is no heat transfer between indoor and outdoor), the indoor temperature will not decrease, but will increase. Reasons for temperature rise: 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.
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. Combined with "evaporation needs to absorb a lot of heat from the electric fan", people will feel cool.
Baidu encyclopedia-electric fan