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真空技术及应用系列讲座东北大学真空工程博士点，博士导师杨乃恒先生主持第三讲：机械真空泵（六）张以忱（东北大学）七、无油干式机械真空泵（一）概述无油干式机械真空泵（以下简称干式机械泵）是指泵能从大气压力下开始抽气，又能将被抽气体直接排到大气中去，泵腔内...
Vacuum Technology and Applications Lectures Vacuum Engineering Northeast University doctoral, PhD supervisor Mr. Yang Naiheng Lecture 3: Mechanical vacuum pump (6) Zhang Yichen (Northeastern University) 7, oil-free dry mechanical vacuum pump (1) Overview Oil-dry mechanical vacuum pump (Hereinafter referred to as dry mechanical pump) refers to the pump can start pumping under atmospheric pressure, but also will be pumping gas directly to the atmosphere, the pump cavity ...