这就是将上述的“单级泵” 或“双级泵” 作于高压侧，被称为“前级泵” (backing pump) ；而用罗茨真空泵（Roots Pump）作为主泵，或称增压泵。
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... backing power 倒车功率，后退功率 backing pump 旋转油泵；初级抽气泵，前置泵；备用泵 backing ring 衬环；垫环；支承环 ...
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vacuum backing pump 真空旋转泵
mechanical backing pump 前级机械泵
backing vacuum pump 前级真空泵
backing pump for molecular pump 分子泵的前级泵
backing g pump 前级泵 ; 预抽真空泵
high-backing pressure pump 高背后压力泵
This Model Vacuum pump can be used along, or as the backing pump of the other kinds of pumps, such as booster pump, diffusion pump, molecular pump etc.
它可以单独使用，管道泵也可作为增压泵、扩散泵、分子泵的前级泵使用。
Non-pollution, The pump body is made of polyvinyl chloride (pvc)plastics, and the onter cover is of cold-rolled steel plate with backing finish.
无污染，本机箱体为聚氯乙稀塑料，外壳采用不锈钢和冷板静电喷塑壳两种。
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