The refrigerator is a refrigeration equipment to maintain a constant low temperature, but also a kind of food or other items to maintain a constant low-temperature state of civilian products. Inside the box there is a compressor, ice machine for ice cabinets or boxes, with refrigeration device storage box. Domestic refrigerator volume is usually 20 to 500 liters. 1910 the world's first compression type refrigeration domestic refrigerator in the United States.