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Fridge Inductive Contact Sensor

Fridge Inductive Contact Sensor

Fridge Inductive Contact Sensor Humans have known from a very early time that it is not easy to corrupt foods stored at lower temperatures. For more than 2,000 years BC, the ancient inhabitants of the Euphrates and Tigris river basins in West Babylon have begun to pile ice cubes in the pits to...

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Fridge Inductive Contact Sensor



Humans have known from a very early time that it is not easy to corrupt foods stored at lower temperatures. For more than 2,000 years BC, the ancient inhabitants of the Euphrates and Tigris river basins in West Babylon have begun to pile ice cubes in the pits to refrigerate meat. China also knew how to use ice cubes to preserve food during the Shang Dynasty (early 11th century, 17th century BC). In the Middle Ages, many countries also had original refrigerators that put ice cubes in special water cabinets or stone cabinets to preserve food. Until the 1850s, the United States sold such refrigerators.
In 1822, Faraday, a well-known British physicist, discovered that gases such as carbon dioxide, ammonia, and chlorine would become liquid under pressure, and they would turn into gas when the pressure dropped. In the process of changing from a liquid to a gas, heat is absorbed in large amounts, and the surrounding temperature drops rapidly. Faraday’s discovery provided a theoretical basis for later inventors such as compressors and other artificial refrigeration technologies. The first artificial refrigeration compressor was invented by Harrison in 1851. Harrison was the owner of Australia’s “Kilang Advertising”. He once discovered that when ether was used for cleaning, he found that the ether had a strong cooling effect on the metal. Ether is a liquid with a very low boiling point and it is prone to evaporation and endothermic phenomena. Harrison researched and produced a freezer using an ether and refrigerator pressure pump and applied it to a winery in Victoria, Australia, for cooling and cooling during winemaking.
In 1873, the German chemist and engineer Karl von Linde invented a freezer using ammonia as a refrigerant. Linde uses a small steam engine to drive the compression system, which causes ammonia to undergo repeated compression and evaporation, producing refrigeration. Linde first used his invention for the Sedummar winery in Wiesbaden and designed and manufactured an industrial refrigerator. Later, he improved the industrial refrigerator. To miniaturize it, in 1879, it produced the world's first artificially cooled domestic refrigerator. This steam-powered refrigerator was soon put into production. By 1891, it had sold 12,000 units in Germany and the United States.
The first refrigerator that used motors to drive compressors was invented in 1923 by Swedish engineers Brighton and Montess. Later, a U.S. company bought their patents and in 1925 produced the first domestic refrigerators. The original refrigerator had its electric compressor and refrigerator separated. The latter was usually placed in the home's kiln or storage room, and was connected to the electric compressor through the pipeline. It was only later that it was combined. Before the 1930s, the refrigerants used in refrigerators were mostly unsafe, such as ether, ammonia, sulfuric acid, etc., or were flammable, corrosive, or irritating. Later he began to search for safer refrigerants and found Freon. Freon is a non-toxic, non-corrosive, non-flammable fluorine compound that soon became a refrigerant for various refrigeration equipment and has been used for more than 50 years. However, it was also found that Freon has a destructive effect on the ozone layer of the Earth’s atmosphere. So people began to look for new and better refrigerants.

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