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Electric heaters
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Heat is the process of converting electrical energy into thermal energy. Since the discovery that the power supply can cause thermal effects through wires, many inventors in the world have been engaged in the research and manufacture of various electric heating appliances. The development and popularization of electric heating is also the same as in other industries, following such a rule: gradually expanding from advanced countries to countries around the world; gradually developing from cities to rural areas; from collective use to households, to individuals; products from low-grade development To high-end. The electric heating appliances in the nascent stage of the nineteenth century were mostly poor. The earliest appeared electric heating appliances for life. In 1893, the prototype of electric comforter appeared and used in the United States, and then the use of electric stoves appeared in 1909. An electric heater is placed in the stove, that is to say, the heating is transferred from firewood to electricity, that is, from electrical energy to thermal energy. However, the rapid development of the real electric heating appliance industry came after the invention of the nickel-chromium alloy used as an electric heating element. In 1910, the United States successfully developed the electric comforter made of nickel-chromium alloy electric heating wire, which fundamentally improved the structure of the electric comforter, and the use of the comforter quickly gained popularity. By 1925, products that installed electric heating elements in pots appeared in Japan and became the prototype of modern electric rice cookers. At this stage of industry, electric heating products such as laboratory electric furnaces, glue melting furnaces, and heaters also appeared. From 1910 to 1925, the emergence and popularization of various varieties of electric heating appliances in the household and industry have developed rapidly, especially in the household, which is a major stage of development in the history of electric heating appliances. Therefore, the invention of nickel-chromium alloys laid the foundation for the development of the electric heating appliance industry.
After the 1920s, there were not many new applications and developments in the previous period. However, during this period, all kinds of electric heating appliances have been re-ordered and continuously improved, becoming an improvement stage in the history of electric heating appliances. In terms of household electric appliances, various appliances are designed to be more beautiful, durable and sturdy, and most of them have automatic temperature and time control. Control, so the use of illegal methods, temperature differences and the possibility of disasters can be eliminated. Like electric stove, toaster, pancake maker, etc. all have automatic control. At the same time, the manufacturing materials have also been improved, such as using grade A nickel-chromium wires with good quality limits, and using magnesium oxide or zirconia as insulators. In terms of industry, like home heating appliances, the use of automatic control devices and the use of good materials, such as melting pots, lead melting furnaces, various large-scale ovens, heat treatment furnaces, etc. have been generally improved and applied. After the 1940s, due to the advancement of science and technology in the United States, cheap electricity bills, war money, and relatively high incomes, the promotion of electric heating appliances into the popularization stage. In 1940, the popularity of electric comforters in American households reached an understanding of the situation. Before the liberation of our country, due to imperialist aggression and reactionary rule, the electric heating appliance industry has been in a very backward state. Only after the liberation has it continued to develop, especially in recent years, in terms of product variety, quantity and application penetration rate has entered a stage of rapid development.
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