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Word版设计说明书1份，共33页，约14000字
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CAD版本图纸，共6张

LWG-150双头螺杆型干式无油真空泵的设计
摘  要
干式双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，自吸能力强，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，可高速平稳的一作，适应性强，还可用于多相混输，无喘振现象，易于实现连续排气等诸多优点，因此厂泛的应用于冶金、电子、化学、食品、医药、环保等工业生产部门。国外已发展出诸多此类真空泵产品，而在我国的发展却相对落后。虽然我国对无油真空泵的需求日益增长，但是许多跨国公司的真空泵产品却在我国的高端真空泵市场中占据了主导位置。因此，自行研究经济可行、运转可靠的无油真空泵意义可见一斑。为了适应我国开发研究生产螺杆真空泵的需要，本文对双螺杆真空泵的设计型线组成问题等内容进行了的研究与探讨。

关键词：双头干式真空泵；螺杆；型线

 
LWZ-150 Double-Headed Screw Type Dry Vacuum Pump
Abstract
  The oil-free twin-screw vacuum pump is a new kind of rotational positive displacement pump.The structure of the pump is simple and liquids or solids are hard to accumulate when sucked with gas or are condensed or solidified in the 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, work placidly with high speed, strong adaptability, mufti-phase duties, no quiver, easy to continuous exhausting, etc. It is used widely in industrial territory of metallurgy, electron, chemistry, pharmacy, food and environment, and so on. At present, all over the world have been trying their best to develop oil-free vacuum pumps, but our country has been fallen behind other countries.  Although the demand of the oil-free vacuum pumps has been experiencing a rapid growth, the products of many multinational companies take up the major market share of dry compression vacuum pumps and high vacuum pumps. Therefore it is very significant to develop economical, feasible and reliable dry-running vacuum pumps by us. For the sake of requirements of developing and researching in our country, the paper investigates the meshing theory of twin-screw pump, buildup of the rotors' curve, and leaks.

Keywords：dry(oil-free)vacuum;pump;screw

 
目  录
1  绪论 1
1.1概述 1
1.2课题背景及研究意义 1
1.3 螺杆泵的应用及特点 3
1.4螺杆真空泵在国内外的研究现状与发展方向 4
2  螺杆双头干式真空泵转子型线的研究 6
2.1 常见转子型线比较 6
2.2 多头双边对称圆弧型线 8
2.2.1 转子型线要素 9
2.2.2 转子型线设计原则 10
2.2.3 多头双边对称圆弧型线方程 11
3  螺杆双头干式真空泵工作原理 14
3.1 吸气过程 14
3.2 压缩过程 15
3.3 排气过程 15
4  螺杆双头干式真空泵设计计算 17
4.1 螺杆基本尺寸 17
4.2 排气量 19
4.2.1 理论排气量 19
4.2.2 实际排气量 20
4.3 进排气孔口 20
4.3.1 轴向进气口 20
4.3.2轴向排气口 21
4.4 极限真空度、功率及冷却水量 21
4.5 轴的强度计算 21
4.6 同步齿轮的设计计算 22
4.6.1齿轮尺寸计算 22
4.6.2齿轮强度校核 23
5  结论与展望 24
参考文献 25
致谢 26
毕业设计（论文）独创性 27
毕业设计（论文）知识产权声明 28