允许吸上真空高度Hs是指泵入口处压力p 1可允许达到的最大真空度。
Allows a high degree of vacuum suction on the Hs is p1 pressure pump at the entrance to allow the greatest vacuum.
该文介绍了油封机械泵的抽速与入口压力的关系、泵抽气效率下降的原因，指出泵入口管道的流导和油蒸汽逆流是造成泵抽速下降的主要原因。
Discusses the relationship between pumping speed and inlet pressure of an oil-sealed mechanical pump and the reason why its pumping efficiency drops down.
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