In the planning and accounting of the vacuum system, people call the vacuum pump which directly extracts the vacuum container as the main pump, and the vacuum pump which insists on the pressure of the other pump below the critical pre stage pressure is called the front stage pump. In order to make the vacuum pump in the container to be pumped quickly from atmospheric pressure to the working pressure of the main pump, it is called pre pumping vacuum pump. For a vacuum system, the former stage pump of the system is often used as the pre pumping vacuum pump. The selection of pumps here refers to the selection of main pumps. In a narrow sense, it refers to the proper matching of the main pump with a reasonable front stage pump. In a broad sense, it includes the selection of the front stage pump and the pre pumping pump. The central equipment of vacuum system is vacuum pump, and the key process of vacuum system planning is pump selection and pump distribution.
The main pump type, the first thing to consider is the feasibility and reliability of the problem, should be based on the vacuum pump to reach the limit of vacuum degree and operating vacuum (select the limit vacuum of the main pump is slightly higher than the limit vacuum of the vacuum chamber), according to the type of gas to be pumped, the proportion of each gas, and the gas mixed with dust and other conditions, select the true pump air that meets the process requirements. When two or more different types of pumps are suitable for the above conditions, we should select the economically reasonable vacuum pump according to the economic objectives such as initial investment and daily protection cost. Then, further comparison of environmental conditions and other conditions, selected. Therefore, it is necessary to start from the whole set of vacuum system and consider it comprehensively. It is necessary to recognize it only by comparing vacuum pumps.
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