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本文介绍了1932年何增禄先生为了评价扩散泵各种喷咀结构的抽气效率,在他的论文中首先提出了“抽速系数”(Speed Factor)的定义和表达式。这个系数的提出促进了扩散泵性能有很大的提高,结构也有很大的改进。人们为了表彰他这一贡献,将这个系数定名为“何氏系数”(Ho Coefficient)。后来人们以泵口直径为标准来评价泵的抽气效率,将这个系数又分别定义为:“何氏系数”为泵的实际抽速与泵体内径与顶喷咀外径之间的环形抽气面积上按分子泻流计算的理论抽速之比;而“抽速系数”则为泵的实际抽速与泵入口断面积上按分子泻流计算的理论抽速之比。这两个系数之间有一定的换算关系。德国学者Jaeckel(亚开尔)和No。ller(缪勒)分别又给何氏系数提出了新的表达型式,便于计算。使何氏系数更加完善,在一些高真空泵的设计和改进上得到了广泛地应用。
In this paper, Mr. He Zenglu introduced the definition and expression of “Speed Factor” in his paper in order to evaluate the pumping efficiency of various nozzle structures of diffusion pumps in 1932. The proposed coefficient has greatly promoted the diffusion pump performance has greatly improved, the structure is also greatly improved. In recognition of his contribution, people named the coefficient “Ho Coefficient.” Later, people used the pump port diameter as a standard to evaluate the pumping efficiency of the pump. The coefficients were also defined as: “Ho coefficient” is the actual pumping speed of the pump and the annular pumping between the inner diameter of the pump body and the outer diameter of the top nozzle The ratio of the theoretical pumping speed calculated according to molecular diathermy flow rate and the “pumping speed coefficient” is the ratio of the actual pumping speed of the pump to the theoretical pumping speed calculated by molecular diaspora at the pump inlet cross-sectional area. There is a certain conversion between these two coefficients. German scholar Jaeckel (Yajil) and No. ller (Müller), respectively, to give the coefficient of He’s new expression, easy to calculate. Ho coefficient to more perfect, in some high vacuum pump design and improvement has been widely used.