STUDY ON PRESSURE RESPONSE OF EJECTOR VACUUM CIRCUIT

Authors

  • Zhonghua Guo Department of Mechanical Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, P.R.China
  • Xiaoning Li Department of Mechanical Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, P.R.China
  • Xin Li Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan
  • Toshiharu Kagawa Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan

Keywords:

ejector vacuum circuit, flow-rate characteristics, pressure response

Abstract

In the pneumatic vacuum systems that usually consist of air powered ejector, chamber, and resistance, the pressure response of the vacuum circuit is critical to the systematic strategic planning. This paper analyzes each component of the vacuum circuit and their effects on pressure response. Firstly, a model is proposed to calculate the pressure change by using the air status equation and ejector flow-rate characteristics. For the tested ejectors with linear flow-rate characteristics, the dynamic pressure responses are a first-order system under the isothermal condition without resistance. The proposed model has been proven experimentally to be valid and it can be used in the simulation of pressure response. Secondly, the effect of resistance inserted between ejector and chamber is analyzed by combining the flow-rate characteristics of the ejector and the resistance. The further dimensionless treatment is made by introducing a new parameter Gr* that indicates the effect of the resistance. Finally, the effects of temperature changes on pressure responses are studied on the basis of experimental data. The pressure response is faster in the non-isothermal chamber at the beginning of vacuum generation than that in isothermal chamber but it takes a long time to reach final vacuum degree.

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Author Biographies

Zhonghua Guo, Department of Mechanical Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, P.R.China

Zhonghua GUO Born in August 1983. Ph. D applicant of Nanjing University of Science and Technology (P.R. China). She is doing research as a visiting associate in the Precision and Intelligence Laboratory of Tokyo Institute of Technology (Japan). Her Ph. D research field is pneumatic ejector system design and measurement.

Xiaoning Li, Department of Mechanical Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, P.R.China

Xiaoning LI Born in February 1957. Received his Ph. D degree from Harbin Institute of Technology (P.R. China) in 1989. He is working as a professor in School of Mechanical Engineering of Nanjing University of Science and Technology. His primary research interests are modelling, simulation and control for advanced manufacturing system and pneumatic control technology.

Xin Li, Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan

Xin LI Born in September 1979. Received his Ph. D degree from Tokyo Institute of Technology (Japan) in 2009. He is working as assistant professor in the Precision and Intelligence Laboratory of the institute. His primary research fields are pneumatic handling device and compressible fluid control & measurement.

Toshiharu Kagawa, Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan

Toshiharu KAGAWA Born in November 1950. Received his M. Se and Ph. D degree from Tokyo Institute of Technology in Japan. He is working as a professor at the Precision and Intelligence Laboratory of the institute. His primary research interests are fluid dynamics, fluid measurement and control.

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Published

2011-03-01

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Original Article