Microwave oven (microwave oven/microwave oven), as its name implies, is a modern cooking stove that uses microwave to heat food.
Microwave is an electromagnetic wave. The microwave oven consists of power supply, magnetron, control circuit and cooking cavity. The power supply provides a high voltage of about 4000 volts to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are coupled into the cooking cavity through the waveguide system.
There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotation, so it can evenly distribute microwave energy in the cooking cavity, thus heating food. The power range of microwave oven is generally 500 ~ 1000 watt.
During the Second World War (1945), Spencer, an American radar engineer, happened to find the chocolate bar in his pocket melted and sticky while doing radar experiments. He suspected that it was caused by his body temperature, and later he found the thermal effect of microwave in continuous experiments.
Using this thermal effect, the United States issued a 1 patent on microwave in 1945, and Raytheon Company of the United States developed the world's first 1 microwave oven in 1947. In the 1940s, microwave ovens were mainly used in industry and commerce.
After people's continuous improvement, the household microwave oven was born in western Europe in 1955, and began to enter the family in the 1960s. In the 1970s, due to the problems of radiation safety and convenient operation, the cost of the microwave oven continued to drop, and it was further popularized and used, forming an important family industry, and at the same time, it was constantly improved in variety and technology.
In 1980s and 1990s, the continuous application of control technology and sensing technology made microwave ovens widely popular.