由于这种泵的结构和螺杆间存在的侧间隙，它可以输送非润滑性介质。
Owing to the pump structure and side clearance between screw, it can transport non-lubricative medium.
为了最小化油蒸汽的回流，一些冻干机在真空泵和前箱间设计了弯曲的管路。
In order to minimize oil vapor migration, some lyophilizers are designed with a tortuous path between the vacuum pump and chamber.
同时螺杆与泵体、螺杆与螺杆间又相互形成密封腔，保证密闭，否则就可能有液体从间隙中倒流回去。
Screw pump body and at the same time, each other between the screw and screw and form a sealed chamber, ensure airtight, otherwise there may be liquid backflow from the gap.
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