Dissertation > Excellent graduate degree dissertation topics show

Research of Profile Designing, Processing and Surface Coating on Multi-Stages Roots Pump Rotor

Author: LiuQuanLi
Tutor: BaDeChun
School: Northeastern University
Course: Fluid Machinery and Engineering
Keywords: Dry pumps Roots Type line Machining Coating
CLC: TH38
Type: Master's thesis
Year: 2008
Downloads: 118
Quote: 0
Read: Download Dissertation

Abstract


In the emerging chip semiconductor industry, optical communications components and flat panel monitors and other products of the production process, no oil molecules pumps, cryogenic pumps dry high vacuum pump has been widely used. Dry with these high-grade low-vacuum pump before mating mostly traditional oil-sealed vacuum pumps. To reduce the oil pollution, usually in the high and the low vacuum pump connected in series between the cold trap, but this method can not meet the vacuum requirements of cleanliness. Therefore, the research and development of high performance and low cost, long life, simple structure, high efficiency pumping dry vacuum become now and for quite a long period of vacuum science and technology personnel urgent need to address the problems. Among the dry vacuum pump, a multi-stage Roots type dry vacuum pumps are highly semiconductors, optical devices and other high-tech industries in favor of a positive displacement dry vacuum. This topic around the multi-stage Roots type dry vacuum pump key components - Roots rotor, made the following specific tasks: creating into law by computer simulation of three common Roots Rotor analyzed. Then Involute Rotor design, based on the design of an improved arc-type rotor type line. And through capacity utilization factor and backlash type line distribution and other aspects of the analysis and comparison, the final arc due to improved capacity utilization factor Rotor larger backlash stable distribution, etc., using an improved arc Rotor As a multi-stage Roots pump rotor type line dry. The multi-stage Roots rotor machining method discussed. For a special type of rotor line in drawing CNC wire cutting, lathe processing and 2.5-axis CNC milling machine rotor technology program. In the ordinary lathe rotor designed key processes applied eccentric fixture in 2.5-axis CNC milling machining, through the CATIA software simulation of the rotor machining process. Finally, from the feasibility and processing economy, precision, a comparative analysis of three programs; multistage Roots rotors for surface coating process conducted exploratory research. Samples on the rotor deposited by magnetron sputtering hard corrosion-resistant coating, by adjusting the operating vacuum, argon gas flow rate, the sputtering time and other parameters, for the preparation of a Cr magnetron sputtering process was studied. In testing, the use of standard salt spray test, the rotor for corrosion process before and after treatment were compared corrosion resistance, and hardness before and after film deposition, microstructure, surface roughness, etc. auxiliary research.

Related Dissertations

  1. EDM Electrode Wear Mechanism and Control Research,TG661
  2. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  3. Compared Study on Elite Culture and Grass-roots Culture of the Modern "Three Lanes and Seven Alleys",TU984.114
  4. The Study of the Villagers’ Autonomy in China Based on the Democratization Process,D422.6
  5. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  6. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  7. Analysis of Morphological Appearances and Physiologal Characteristics in Old Camphor Trees Having Different Growth Potentials,S792.23
  8. Research on Microstructures and Properties of FeMnCrNiAlBSi/Cr3C2 Coatings,TG174.44
  9. Investigation of Plasma Sprayed NiCr-Cr3C2 Coating on Mould CrZrCu Alloy Plates,TG174.442
  10. Synthesis and Modification of Nano LiFePO4 as Cathode Materials,TM912
  11. Research on Rural Part and Cadres Distance Education (Zhenhai Ningbo for Example),D262.3
  12. Solve financial difficulties grassroots local government level Perspective Studies,F812.2
  13. Locomotive wheels Process Analysis and Optimization,U260.33
  14. Research on Micro Machining Technology of Ultraviolet Laser,TG665
  15. Constructed wetland treatment polluted river water and wetland plants Screening,X703
  16. A Comparative Study on Novice-Expert Teachers’ Classroom Emotion Work in Junior Middle School,G632.4
  17. Micro hybrid spindle effect of temperature on the dynamic characteristics of the theoretical and experimental study,TH133.36
  18. Hubei Tippy Tea continuous processing key technology research and process optimization,TS272.51
  19. Ware Parts Machine Tool Design and Key Technologies,TG65
  20. Non-oriented silicon organic - inorganic composite coating on very thick insulation,TG174.4
  21. SST -based soft abrasive and impact stream flow and experimental study of mechanical properties,TG664

CLC: > Industrial Technology > Machinery and Instrument Industry > Pump > A variety of purposes
© 2012 www.DissertationTopic.Net  Mobile