真空泵的作用就是从真空室中抽除气体分子，降低真空室内的气体压力，使之达到要求的真空度。概括地讲从大气到极高真空有一个很大的范围，至今为止还没有一种真空系统能覆盖这个范围。
The function of vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and make it reach the required vacuum degree. Generally speaking, there is a wide range from atmosphere to extremely high vacuum. So far, no vacuum system can cover this range.
因此，为达到不同产品的工艺指标、工作效率和设备工作寿命要求、不同的真空区段需要选择不同的真空系统配置。
Therefore, in order to meet the requirements of process index, work efficiency and equipment life of different products, different vacuum section needs to choose different vacuum system configuration.