发明申请
US20140127031A1 SCREW ROTOR FOR EXHAUST PUMP, METHOD FOR MANUFACTURING THE SAME, GAS EXHAUST PUMP HAVING SCREW ROTOR, AND MANUFACTURING METHOD AND ASSEMBLY METHOD OF THE SAME
审中-公开
用于排气的螺杆转子，其制造方法，具有螺旋转子的气体排气泵及其制造方法及其组装方法
- 专利标题： SCREW ROTOR FOR EXHAUST PUMP, METHOD FOR MANUFACTURING THE SAME, GAS EXHAUST PUMP HAVING SCREW ROTOR, AND MANUFACTURING METHOD AND ASSEMBLY METHOD OF THE SAME
- 专利标题（中）： 用于排气的螺杆转子，其制造方法，具有螺旋转子的气体排气泵及其制造方法及其组装方法
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申请号： US14233427申请日： 2012-06-27
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公开(公告)号： US20140127031A1公开(公告)日： 2014-05-08
- 发明人: Masamichi Iwaki , Tadahiro Ohmi , Kenji Ohyama , Isao Akutsu
- 申请人： Masamichi Iwaki , Tadahiro Ohmi , Kenji Ohyama , Isao Akutsu
- 申请人地址： JP Sendai-shi, Miyagi
- 专利权人： TOHOKU UNIVERSITY
- 当前专利权人： TOHOKU UNIVERSITY
- 当前专利权人地址： JP Sendai-shi, Miyagi
- 优先权： JP2011-160358 20110721
- 国际申请： PCT/JP2012/004151 WO 20120627
- 主分类号： F04C2/12
- IPC分类号： F04C2/12
摘要：
There is provided a screw rotor that can ensure safe rotation and can greatly increase a pumping performance of a pump. The screw rotor is placed with a gap between a top end surface of a tooth of a screw portion and an inner wall surface of a stator. A PFA film is provided on the top end surface. If the PFA film of the present invention is provided in a predetermined manner, the width of a gap between a free surface of the PFA film and the inner wall surface of the stator can be made significantly smaller than that of a conventional one, so that the pumping performance is greatly improved. After coating at least the top end surface of the screw rotor with PFA, followed by melting and remelting processes, the PFA film is formed to have a high smoothness on its free surface.
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