society, the rich family is definitely a minority, can afford mahogany furniture, not necessarily can use mahogany-made refrigerator, which is why the refrigerator collection value is high, not only that, its future significance will be even more important. The invention of the refrigerator allows mankind to stay away from moldy food, can lower the temperature and preservation, so that we can enjoy healthy food in the summer, can not help but say that science and technology to bring people a kind of progress. China's earliest "refrigerator" in the Yuan dynasty mural more than 670 years ago in Hongdong County, Shanxi Guangsheng Temple of the Yuan dynasty mural, cultural relics workers found that more than 670 years ago, the Chinese people have mastered the principle of refrigerator freshness, know how to use the ice to store food, is the earliest Chinese refrigerator found today. The society of the time, the rich family is absolutely a minority, can afford mahogany furniture, not necessarily can use mahogany made refrigerator, which is why the refrigerator collection value is high reason, not only that, its future significance will be more important. The invention of the refrigerator allows mankind to stay away from moldy food, can lower the temperature and preservation, so that we can enjoy healthy food in the summer, can not help but say that science and technology to bring people a kind of progress. China's earliest "refrigerator" in the Yuan dynasty mural more than 670 years ago in Hongdong County, Shanxi Guangsheng Temple of the Yuan dynasty mural, cultural relics workers found that more than 670 years ago, the Chinese people have mastered the principle of refrigerator freshness, know how to use the ice to store food, is the earliest refrigerator found in China today.
In 1858, an American named Hamilton Smith made the world's first washing machine in Pittsburgh. The main part of this washing machine was a circular drum containing a straight shaft with paddle-like leaves. The shaft was turned by cranking a crank attached to it. Smith patented this washing machine in the same year. However, this washing machine is laborious to use, and damage to the clothes, so it is not widely used, but this marks the beginning of the use of machine laundry. The following year in Germany appeared a pestle and mortar as an agitator washing machine, when the pestle and mortar up and down movement, fitted with springs of wooden pegs will be a continuous effect on the clothes. the late 19th century, the washing machine has been developed to a handle to rotate the octagonal washing tank, the washing tank into the hot soapy water, the clothes washed, by the rolling device to squeeze the clothes dry. In 1874, "hand-washing era" was unprecedented challenge, the American Bill Blacks invented a wooden hand-cranked washing machine. Blacks washing machine construction is extremely simple, is installed in a wooden cylinder with 6 blades, with a handle and gear drive, so that the clothes in the cylinder turned, so as to achieve the purpose of "clean clothes". The introduction of this set of devices, so that those who are to improve the efficiency of life and meditation greatly inspired, the process of improving the washing machine began to greatly accelerate. In 1880, the United States and the emergence of steam washing machine, steam power began to replace manpower. After hundreds of years of development and improvement, the modern steam washing machine than the early have no and Lun with the improvement, but the principle is the same. The function of modern steam washing machine includes steam washing and steam drying, and it adopts intelligent water circulation system, which can double spray high concentration washing liquid and high temperature steam to the clothes at the same time, running through the whole washing process, realizing the world's original "steam washing" brand new washing method. Unlike ordinary drum washing machines that need to heat up the water in the entire drum when washing, steam washing is designed to deep clean the clothes. When a small amount of water enters the steam generator box and is converted into steam, the high temperature jet decomposes the clothing stains. Steam washing is fast, thorough, requires only a small amount of water and saves time. For winter clothes that have been in the closet for a long time and have developed wrinkles and odors, it allows them to stretch naturally and smooth out the wrinkles. "Steam drying" works by spraying a constant amount of steam onto the clothes, stretching them out and then condensing them at a constant temperature. In this way, heavy clothes not only dry faster, but also have a stretching and ironing effect. Steam washing machines were followed by water-powered washing machines and internal combustion engine washing machines. Hydraulic washing machine includes washing drum, power source and connectors connected to the boat, the washing machine is equipped with inlet and outlet holes, the washing machine shell is equipped with power source, the washing drum is equipped with clothes inlet holes and its inlet is equipped with a sealing cover, and the washing machine is connected to the boat through the connectors. It does not need any electricity, only the natural river water power to wash clothes, relieving boat people on board the trouble of washing clothes, saving time and reducing the intensity of domestic labor. In 1910, the United States of America Fisher in Chicago, the world's first successful trial production of electric washing machines. The introduction of electric washing machine, marking the beginning of the automation of human housework. In 1922, the U.S. Mataeger transformed the washing machine washing structure, the drag type to agitation, so that the structure of the washing machine is fixed, which is the birth of the first agitation washing machine. This washing machine is installed in the center of the cylinder on a vertical axis, the lower end of the vertical axis is equipped with a stirring wing, the motor drives the vertical axis, the periodic positive and negative swing, so that the clothes and the water constantly rolling, friction with each other, in order to wash away the dirt. The structure of agitator washing machine is scientific and reasonable, which is generally welcomed by people. In 1932, the United States Bendix Airlines announced that they had successfully developed the first front-loading drum washing machine, washing, rinsing, dehydration in the same drum to complete. This meant that the type of electric washing machine jumped to a new level and took a big step forward towards automation. The first automatic washing machine was introduced in 1937. It was a "front-loading" type of automatic washing machine. The cylinder, which was driven by a horizontal shaft, could hold up to 4,000 grams of clothes. The clothes were rolled up and down in the water-filled tank to remove dirt and grime. In the 1940s, the modern "top-loading" automatic washing machine appeared. With the acceleration of industrialization, countries around the world also accelerated the pace of development of washing machines. First of all, Britain developed and launched a jet washing machine, which relies on the strong eddy current generated by the running wheel on one side of the cylinder to make the clothes and the washing liquid roll continuously in the cylinder to wash the clothes. In 1955, on the basis of the introduction of the British jet washer, Japan developed a unique style of washing machine, which is still popular today. By now, the situation of the wave type, drum type and agitation type in the field of washing machine production was initially formed. In the 1960s, a double-bucket washing machine with a drying bucket appeared in Japan, which was called a "semi-automatic washing machine". In the 1970s, fully automatic washing machines with a drum set were produced. In the late 1970s, fully automatic washing machines controlled by computers (actually microprocessors) were introduced in Japan, creating a new stage in the history of washing machine development. In the 80's, the application of "fuzzy control" made the washing machine easier to operate, more complete functions, the washing program more with the wishes of the more fashionable appearance ...... In the 90's, due to the improvement of the motor speed control technology, the washing machine realizes a wide range of rotational speed change and adjustment, giving birth to many new water flow automatic washing machines. adjustment, many new water flow washing machines were born. After that, with the development and improvement of motor drive technology, Japan produced a direct motor-driven washing machine, eliminating the gear transmission and speed change mechanism, which triggered a huge revolution in the driving method of washing machines. After that, with the further development of technology, the drum washing machine has become a product that is familiar to everyone. Along with the further development of science and technology, I believe that the new more suitable for people to use the washing machine will bring a new way to our life.