With the development of vacuum applications, vacuum pumps in today's society have become more and more rich. According to the survey, the pumping speed of vacuum pumps ranges from several tenths of a second to hundreds of thousands of liters per second and millions of liters. According to its working principle, the type of vacuum pump can be divided into two kinds, namely, gas capture pump and gas transfer pump, which are widely used in metallurgy, chemical, food, electronic coating and other industries. The effect on people's life is also more and more important. According to the provisions of the People's Republic of China Machinery Industry Standard JB / T7673-95, all kinds of domestic vacuum pump is composed of the basic model and the auxiliary type of two parts, the middle of the two is a horizontal line. Its expression pattern is 123-456. The number 123 in the grid represents the base model and 456 the auxiliary model. Domestic vacuum pump models are usually shown in Table 3-2 Chinese pinyin letters. If preceded by "2" in the phonetic alphabet, the pump is structurally a two-stage pump. In some vacuum pump series, the pumping speed is divided by geometric series. The unit is "L / S". Divided into 18 levels, respectively, 0.2,0.5,1,2,4,8,15,30,70,150,300,600,1200,2500,5000,10000,20000,40000. Vacuum pump series can sometimes be used to indicate the size of the pump inlet, the unit is "mm." Due to the type of pump more, the selection should refer to different manufacturers of product brochures sample is very important. So to find suitable products for their work and production is crucial. With the rapid development of science and technology, the development of vacuum pumps in the international community is getting faster and faster. At present, the technical level of domestic vacuum pump equipment to enhance fast, it can be said that the entire vacuum pump equipment has matured. Faced with the rapid development of China's energy, steel, machinery, chemical and other major industries, their demand and demand for vacuum pumps are also increasing, and the development of these industries is bound to promote the rapid development and development of vacuum pumps, vacuum pump development prospects deserve everyone expected.
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