发明授权
- 专利标题： Screw pump with improved efficiency of drawing fluid
- 专利标题（中）： 螺杆泵提高了拉液效率
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申请号： US11891532申请日： 2007-08-09
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公开(公告)号： US07484943B2公开(公告)日： 2009-02-03
- 发明人: Yuya Izawa , Shinya Yamamoto , Masahiro Inagaki , Makoto Yoshikawa
- 申请人： Yuya Izawa , Shinya Yamamoto , Masahiro Inagaki , Makoto Yoshikawa
- 申请人地址： JP Kariya-Shi
- 专利权人： Kabushiki Kaisha Toyota Jidoshokki
- 当前专利权人： Kabushiki Kaisha Toyota Jidoshokki
- 当前专利权人地址： JP Kariya-Shi
- 代理机构： Morgan & Finnegan, LLP
- 优先权： JPP2006-219332 20060811
- 主分类号： F04C2/00
- IPC分类号： F04C2/00 ; F04C11/00 ; F04C23/00
摘要：
A screw pump includes a housing and a pair of intermeshing screw rotors. The housing has an inlet port and an outlet port. Each rotor has a first portion whose lead angle decreases. The first portion and the housing form an inlet space and a pump space. Winding angle of the first portion has a first region and a second region. The first region is located in a predetermined range from the end on the first portion adjacent to the inlet port toward the outlet port. The second region is located adjacent to the first region. Reduction rate of the lead angle of the first portion in the first region is set smaller than that in the second region. The maximum lead angle of the first portion is set smaller than a lead angle which decreases at a constant rate in the first region and the second region.
公开/授权文献
- US20080044304A1 Screw pump 公开/授权日：2008-02-21
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