水环式真空泵的圆柱形泵壳内安装一个偏心的牙状叶轮。

Water Ring Vacuum pump cylindrical shell to install a pump eccentric impeller-shaped teeth.

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单螺杆泵是一种新型的内啮合回转式容积泵。主要工作部件是偏心螺杆（转子）和固定的衬套（定子）。

Single-screw pump is a new volume of the inner rotary gear pump. The main working parts are eccentric screw (rotor) and fixed bushing (stator).

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