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　　1. Introduction:

　　Household appliances (HEA) mainly refer to various electrical and electronic appliances used in homes and similar places. Also known as civil appliances and household appliances. Household appliances free people from heavy, trivial and time-consuming housework, create a more comfortable and beautiful living and working environment for human beings, and provide rich and colorful cultural and entertainment conditions, which has become a necessity of modern family life. Household appliances have been around for nearly a hundred years, and the United States is considered as the birthplace of household appliances. The scope of household appliances varies from country to country, and there is no unified classification of household appliances in the world. In some countries, lighting appliances are listed as a category of household appliances, audio-visual appliances are listed as entertainment appliances, and entertainment appliances also include electric electronic toys.

　　2. The classification method of household appliances has not been unified in the world. However, it is common to classify products according to their functions and uses, which can be roughly divided into 8 categories. (1) refrigeration appliances. Including household refrigerators, cold drinks machines, etc. ② air conditioner. Including room air conditioner, electric fan, ventilator, cold and hot air blower, air dehumidifier, etc. ③ Clean electrical appliances. Including washing machines, clothes dryers, electric irons, vacuum cleaners, floor polisher, etc. (4) kitchen appliances. Include electric cookers, microwave ovens, electromagnetic cookers, electric ovens, electric cookers, dish washers, electric water heaters, food processors, etc. ⑤ Electric heaters. Comprises an electric blanket, an electric quilt, a hydrothermal blanket, an electric clothing and a space heater. ⑥ Cosmetic health appliances. Comprise an electric shaver, a hair dryer, a hair dresser, an ultrasonic face washer and an electric massager. ⑦ Audio-visual appliances. Including mini-projector, TV sets, radios, tape recorders, video recorders, video cameras, music centers, etc. ⑧ Other electrical appliances, such as fireworks alarms and electric bells.

　　With the improvement of life, water purifier has become a member of household appliances, and more and more families use this new type of electrical products: with the serious pollution of most water bodies in the world, the contradiction of water shortage has been aggravated. Traditional tap water treatment methods can no longer guarantee the provision of high-quality drinking water, and there are still secondary pollution problems in municipal water supply, such as high-rise water tank supply and long tap water pipeline, which will all cause potential pollution problems such as rust, sediment and microorganisms. Therefore, various brands of water purifiers came into being, and the filtration methods and materials used by various water purifiers are also different. Among them, the domestic natural and beautiful brand water purifier products meet the drinking water standards of Chinese people.