Strctural Design Of Dry-Type Vacuumpump And Its Rotor Balance Analysis And Simulation

Dry-type vacuum pump(VP) is widely used in aerospace, semiconductor, pharmacy, chemical and other fields. With the improvement of modern industrialization, the demand for VP is gradually increased, especially in the aerospace and semiconductor field. However, at present the VP is of huge volume and high weight, and the rotor is of bad balance. In view of this, an overall structural design on the claw-type VP is advanced. The balance of rotor, which is the core of the VP, is analysed.First, the concepts of vacuum, VP and dry-type VP together with the composition and operation principle of claw-type VP are expatiated. What is more, it is given that the current situation of research and the trend of development concerning VP Domestic and Abroad.Second, an overall design method is advanced, and the overall structural design of VP is finished. The overall structural design mainly includes the design of pump shells, the design of rotor type line and design and check of driving shaft. The design of pump shells must be mainly guaranteed lessening the weight and the wall thickness. As the main working curve line, the type line of rotor is divided into six phases. Then the design of each curve line is given the clarification respectively.Third, the balance analysis of VP rotor is analysed. The balance of VP rotor can be classified into two types, namely static balance and dynamic balance. The static balance mainly researches single rotor. Because the shapes of rotor is irregular, when the imbalance is calculated, cession and supplement method is used. The rotor is divided into five parts in this method and each part with a regular shape, is calculated respectively. The dynamic balance is used to analyse three rotors. In this method, the quantity of imbalance of every rotor is shadowed into different balance surface, where the two balance surface is near the bearing. The total imbalance quantity on the two surfaces is calculated. Then, given weight is added at demand position. This method is different from previous methods which adds weight on rotors to achieve balance. A certain quality on rotors'certain place is cutted to achieve balance in this paper Through the amelioration and optimization of this method, VP rotors'processing and assemble time is decreased effectively.Finally, the Pro/Engineer Software and ADMAS Software is used to simulate. the designed parameter is verified to be viable. It provides a design basis for this VP products.