【作者】 刘冰；

【导师】 张世伟； 张志军；

【作者基本信息】 东北大学 ， 化工过程机械， 2011， 硕士

【摘要】 本文所研究的螺杆真空泵是一种容积式无油真空泵,具有结构紧凑,抽速大,真空度高,可直排大气,使用寿命长,无易损件,运转可靠,维修维护方便,动平衡性好,振动小,无压力脉动与噪音,可高速平稳工作,适应性强等诸多优点。’螺杆式无油真空泵的核心部件是一对相互啮合的转子,转子型线在整体系统中占有十分重要的地位,是关系到螺杆泵性能的关键因素。由于知识产权因素,螺杆泵转子型线一直处于保密,没完全公开。摆线是一种在啮合螺杆间能形成连续接触线且密封性能较好的型线,本文主要研究的是基于摆线的螺杆式无油真空泵转子新型线。本文主要着重于以下几个方面的研究：摆线型线的构成研究。设计了两种转子新型线方程,通过摆线曲线的构成原理推导两种型线的端面型线构成。利用端面型线方程验证两种转子新型线的共轭啮合。在端面型线方程的基础上推导出转子螺旋面方程,进一步推导转子轴面方程,用以描述转子的加工。利用推导的转子型线方程建立转子啮合三维模型,简要描述泄漏通道的构成。几何特性的研究。包括转子的齿间面积、面积利用系数、泄漏三角形、齿间容积和几何抽速的计算。型线特点分析。在转子型线构成及转子型线几何性能的基础上对两种新型线进行分析比较,并且总结两种新型线的优越性。转子端面型线方程推导的方法也可用于其它机械真空泵转子的型线研究,具有一定的指导意义。更多还原

【Abstract】 The screw vacuum pump of this article is a new kind of rotational positive displacement pump,it is outstanding for its excellent efficiency, high vacuum, exhausting to the air directly, a long life, good sucking, reliable work,convenient maintenance, favorable dynamical balance,light vibration, no pressure fluctuate and noise,etc. The key part of an oil-free screw vacuum pump is a couple of rotors that clench each other, which is very important in the whole system. As intellectual property factors, screw rotor profile has been kept secret, did not fully open.Cycloid is a kind of profile between meshing screw, which can form a continuous contact line, and its seal performance is good, so the two kinds of profile’s design is based on cycloid. In this article I have focused on the research as following.Study on the composition of cycloid profile.Designing two kinds of new rotor profile, and describing composition of two kinds of profile’s side surface profile through principles of the cycloid curve. Using two kinds of rotor profile’s equations to verify conjugating meshing of profile.Then, based on the side surface profile equation to derive the rotor helical surface equation, and further derive the rotor shaft surface equation to describe the processing of the rotor. Using derived profile equation to construct rotor meshing three-dimensional map, and describing the composition of leak channels briefly.Study on geometric properties. Including calculation of the rotor using area,interdental area, the area utilization factor, leak triangle, and the volume between teeth, derivation of gometry formula pumping speed.Type line characteristics analysis.Based on rotor profile structure analysis and comparison of two new profiles’ performance, concludes the superiority of two new profiles.The method that deduces the equations of rotor end face profile is applicable to other rotor research of dry vacuum pumps, so it has a certain extent guide purpose.更多还原