| The demand of vacuum environment increasing highly in recent years in the semiconductor and LCD industries in the manufacturing process, and there has been no such request in the traditional oil pumps. Screw-type dry vacuum pumping charactericed of its wide scope speed, structure with simple compact, the exhaust chamber components without friction, long life, low energy consumption, no oil pollution, and other advantages, occupies an more and more important position in the dry Vacuum market. In Europe and the United States and Japan and other developed countries, screw-type dry vacuum in many areas has been more and more a place of the traditional pump. However, due to difficulty in processing screw pump, The use of screw pump mainly rely on imports, but the price is very expensive.In view of the current application of CAD technology in China and growing popularity of the promotion, and the screw pump rotor CAD secondary development was relatively backward,We can use Pro/Engineer to provide the secondary development with Pro/Toolkit and VisualC++6.0Integrated Environment.the establishment of a rapid design system. The system uses three-dimensional modeling technology and the parametic design,through Pro/Toolkit design the screw pump rotor model of the parts, parts of the model can be modified, renewed thus we can design the rotor rapidly.First of all, in the analysis of the characteristics of the screw pumps rotor based on the use of Pro/Engineer of the three-dimensional modeling and parameters function, We can establish the vacuum pump rotor part model. Secondly, through the study of the Pro/Engineer parts of the parametic design and characteristics of screw pump rotor, We can establish the system, the development of parts of the design parameters of the process modules. Through the Pro/Toolkit procedures to achieve the various modules and seamless integration, the establishment of screw pump rotor design system is realized.In the screw pump rotor design of the part model is got by the regeneration, the design of serialized parts to avoid the duplication, improving the efficiency of the design, which make screw pump rotor design makes even more convenient.At the same time, the software system in the commercial development of CAD software in the field of mechanical design application in a new way.There have already exist spiral-lubrication system with simple structure, reliable supply of in the vertical vacuum. However, the theoretical analysis and design about the lubrication system has no specialized study. In this article it will give a preliminary calculations. And recommended for the length of infiltration closure close to the length of the spiral.when the helix angle, axial trough, the spiral trough fixed, along with the deepening spiral groove deep, the oil pressure decay, the lubricating oil can be used rise. When the spiral angle is fixed, axial trough, the spiral troughchange maximum is available at k1=0.6,k2=4. When the spiral groove deep fixed, the spiral angle and axial trough are slowly rising best result inkk1=0.5, spiral angle around 200. |
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