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本文叙述了传统双级油封式机械真空泵的不足，回顾了克服这些不足的几种方法，并提出了一种能改进其性能的新技术方案和结构。这一方案集单级泵和双级泵于一个泵上，使双级泵中的两个泵级既可当作两个独立的单级泵，使用于高压强范围并联抽气，又能组合成一个双级泵，使用于低压强范围串联抽气；从结构上讲，这一方案主要是通过一个组合阀门或三个单独阀门，并对原掺气阀门作些修改而实现的。改进后的双级泵消除了传统双级泵的不足，产生了明显的实际效果，即大幅地增强了抽除水蒸汽的能力，大大提高了高压强范围的抽速和连续抽气的可靠性。此外，这种泵还可以长期变成单级泵使用。
This article describes the shortcomings of the traditional two-stage oil-sealed mechanical vacuum pump, reviews several ways to overcome these deficiencies, and proposes a new technical solution and structure that can improve its performance. This program combines single-stage and double-stage pumps on one pump so that the two pump stages in the two-stage pump can be used as two independent single-stage pumps for pumping in high pressure ranges in parallel and combining Into a two-stage pump for pumping in series at low pressure ranges; structurally, this solution is achieved primarily through a combination valve or three separate valves, with modifications to the original aerated valve. The improved two-stage pump eliminates the deficiencies of the traditional two-stage pump and has the obvious practical effect of greatly enhancing the ability to extract water vapor, greatly improving the pumping speed in high pressure range and the reliability of continuous pumping . In addition, this pump can also be long-term into a single-stage pump.