结果表明，与普通单泵的串联系统相比，采用串联泵的串联系统有很好的节能效果；
The result indicates some conclusions. Series system adopting secondary pump has good ability of energy savings.
泵体部分的轴封为两套串联的机械密封，上部机械密封代号为60b，下部机械密封代号为60a。
Pump body seal part of the series for two sets of mechanical seals, mechanical seal, code-named the upper part 60b, the lower mechanical seal, code-named 60a.
是以罗茨泵为主泵，以旋片泵为前级泵串联而成。
Roots pump is the main pump to pump for the former spin-pump series from.
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