1834, American engineer Jacob? Perkins invented the world's first compression refrigeration device, which is the embryonic form of modern compression refrigeration system. In the same year, Perkins obtained the first patent of freezer issued by Britain. 19 10 the world's first compressed refrigeration household refrigerator came out in the United States. 19 13, Chicago, USA, developed the world's earliest household refrigerator. This kind of refrigerator named "Dumel" is made of wood and has a compression refrigeration system installed inside, but the use effect is not ideal. 19 18, Cobrand engineers from KE-LVZNATOR company in the United States designed and manufactured the world's first mechanical refrigeration automatic household refrigerator. This kind of refrigerator is huge, the shell is made of wood, the insulation material is a mixture of seaweed and sawdust, and the compressor is water-cooled and noisy. However, its birth announced that the development of household refrigerators has entered a new stage. 1925, Lido Company of Sweden developed the household absorption refrigerator. 1927 the general electric company of the United States has developed a fully enclosed refrigerator. 1930, air-cooled continuous diffusion absorption refrigerators with different heating methods were put on the market. 193 1 year, a new refrigerant freon 12 was successfully developed. Household thermoelectric refrigerators began to be produced in the second half of 1950s.