Finite Element Analysis of Rotor Temperature Field of Dry Screw Vacuum Pump

Finite Element Analysis of Rotor Temperature Field of Dry Screw Vacuum Pump Liu Chunjie, Xu Chenghai, Zu Wenwen (School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, Liaoning, China) Effect of convective heat transfer on the temperature field, similarity criterion equation The Dittus; oelter formula calculates the convection heat transfer coefficient. The calculation results show that the rotor temperature field is approximately linearly increasing from the inlet side to the exhaust side, and the exhaust port temperature is approximately 120G. As the rotor speed decreases, the exhaust port temperature rapidly decreases. When the rotation speed is 2000 r/mir or less, the rotor From the inlet side to the exhaust side, the temperature changes below 30C as the origin, creating a coordinate system as shown in the figure. In the yin and yang rotor z, choose 5 measuring points to different positions and use the Fluke F65 type infrared thermometer to measure the temperature. The measuring range is -4C~50C, the accuracy is ±2C. The y coordinate of each measuring point is 60mm, due to the rotor For periodic rotational motion, the circumferential temperature field is uniform and there is no limit to the coordinates of the measurement point x.

The temperature level of the screw vacuum pump is not high, and the effect of thermal radiation is limited. The calculation of the convection heat transfer coefficient is performed using the equation of similarity criterion, and there is a certain error with the actual situation; the comparison between the calculated value and the experimental value of the temperature at the measuring point V) with the rotation speed When the pump works normally, the rotation speed is 3600r/min. With the decrease of the rotation speed, the temperature of the exhaust end surface drops sharply. The main reason is that the working energy of the rotor compressed gas and the friction of the gas are reduced. When the rotation speed is lower than 2000r/min, The temperature difference between the inlet end and the outlet end of the rotor does not exceed 30C, and no forced cooling facility is required. 7. Conclusion This paper uses Solidworks and Ansys software to establish a finite element model for calculating the temperature field of the dry screw vacuum pump rotor. The experimental analysis shows that the model can better Reflecting the change of the rotor temperature field, to further analyze the thermal expansion deformation of the rotor and reasonably determine the sealing gaps in the pump cavity lay the theoretical and experimental foundation. Journal of Shanghai Jiaotong University, 2002, Section 10 Yongli. Research on Several Problems of Multistage Clover Dry Roots Vacuum Pumps . Northeastern University master's degree thesis, 2004 Pakistani handsome. Research on the Structure and Performance of a Novel Rotary Vane Pump Northeastern University Master's thesis, 2005: 63. Jiang Hanwen, Yue Xiaofang, Wu Weilong, et al. In thermal engineering, China organized a delegation to participate in the ISO/TC 112 International Standardization Conference on the 7th, which was organized by the National Vacuum Technology Standardization Technical Committee to participate in the general assembly of ISO/TC 112 (International Organization for Standardization Vacuum Technology Committee) held in Seoul, South Korea. The head is headed by Li Chunying, Secretary General of the National Vacuum Technology Standardization Technical Committee. Members include Zhang Shuzhong, Chief Engineer of Shanghai Shuguang Machinery Manufacturing Plant; Li Yuying, Chief Editor of Shenyang Vacuum Magazine; and Wang Lingling, Secretary of the National Vacuum Technology Standardization Technical Committee.

The conference was organized by KATS (Korea Technical Standards Bureau)/KRISS (Korean Standards Institute). Attending the meeting were more than 20 technical experts and scholars from government agencies, relevant societies, technical institutions, and large-scale enterprises in eight countries including Germany, the United States, the United Kingdom, Japan, Thailand, Switzerland, South Korea, and China.

Before the convening of the conference, the secretariat arranged for the heads of project teams to convene the project group meeting on December 5th respectively. The technical indicators in the six standards such as the vacuum technology vacuum gauge and the standard vacuum gauge were directly compared with those of representatives from various countries. The opinions were further discussed and consensus was reached. The Chinese representatives’ comments on the above draft standards were adopted. The general assembly was held on December 6th. The meeting was chaired by urgen Esenreish, Secretary-General of ISO/TC 112. Each person in charge of the project team informed the delegates of the discussions and resolutions of the six standards at the PT meeting on December 5th. The participants expressed their gratitude and approval to the work of each project team and agreed to ISO/DIS21360 ISO/DIS 9803-. 1/2 ISO/DIS21358 and other technical documents all entered the next phase of work. The meeting agreed to work on the next step to establish three WGs (Working Group), with the Secretary-General urgen Eisenreish assigning the convener for the three WGs. China participated in the work of WG1 (Working Group). The meeting discussed new work projects in 2006 and agreed that seven new work conferences such as "Guidelines for the safe use of turbopumps" proposed by Prof. Hiroshi Heda, etc., Japan passed the proposal to appoint Mr. Friedrichusten as the next chairperson. 23 Mr. urgen Eisenreish, Secretary-General of ISO/TC112, highly praised representatives of China and Thailand for attending the ISO/TC112 Conference and actively participating in international standardization activities.

On December 7, the delegates were invited to visit the Vacuum Technology Center under KRISS (Korean Standard Science Research Institute), South Korea's Songwon Edwards Co., Ltd. and South Korea’s Samsung Electronics Co., Ltd. and were warmly welcomed by the above-mentioned companies. The rapid development of vacuum technology expresses sincere appreciation.

By participating in this conference, the Chinese delegates have benefited a lot.

With the growing importance of international standards in international market competition, countries outside the United States, Japan, and other European countries have recognized the seriousness of the technical barriers that European countries are using to establish international standards and actively participate in international standards. The United States, which was not interested in international vacuum standards in the past, is now actively participating in the meeting, offering opinions and actively hosting the annual meeting of the ISO Technical Committee. Thailand, which is not a TC112 member, sent representatives to the meeting this time and expressed to us the desire to strengthen communication and exchange information.

Actively participating in international standardization activities and participating in the development and revision of international standards will bring obvious benefits and opportunities for the development of the vacuum industry in China. "WTO entry" has brought unprecedented opportunities for us to participate in international standardization activities. As one of the member states of the WTO, this is not only an obligation we should fulfill, but also conducive to improving our technology and management and helping to break through the technology of other countries. Barriers help us to participate in the internationalization of production and global trade competition. At the same time, by participating in the work of international standard system revision, you can also learn about the latest developments in the development of related industries in the world, help China's technical standards into international standards, participate in international conferences, and learn about the latest product processing technologies and market changes, as well as foreign experts. For decades, multinational companies have established contacts. In the international vacuum industry, South Korea’s vacuum has been ranked behind China. However, in recent years, the South Korean government has increased its support for the vacuum industry and attached importance to basic research to rapidly improve its vacuum technology. With strong economic strength, the Korea Vacuum Technology Center has actively participated in international standardization activities. It has hosted international conferences and is responsible for drafting ISO standards. It has expanded its influence in the revision of international standards, and has benefited the country. In recent years, China has weakened or The basic research of vacuum technology was abolished. Over the years, the development of the entire vacuum industry has lost the support of new technologies and basic research, and development has been slow. The original vacuum equipment inspection and calibration system was aging due to lack of input. As more than ten years did not participate in international standard conferences, in the revision of international standards, China’s voice was not paid attention to attend this conference and we felt unprecedented. pressure.

(National Vacuum Technology Standardization Technical Committee Secretariat)

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