发明授权
- 专利标题： Multistage roots-type vacuum pump
- 专利标题（中）： 多级根型真空泵
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申请号： US11509331申请日： 2006-08-24
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公开(公告)号： US07491041B2公开(公告)日： 2009-02-17
- 发明人: Toshio Imai , Hideaki Itou , Masayuki Misaizu
- 申请人： Toshio Imai , Hideaki Itou , Masayuki Misaizu
- 申请人地址： JP Tokyo
- 专利权人： Kashiyama Industries, Ltd.
- 当前专利权人： Kashiyama Industries, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： TraskBritt
- 优先权： JP2005-243032 20050824
- 主分类号： F04C2/00
- IPC分类号： F04C2/00 ; F03C2/00
摘要：
The invention reduces power consumption and makes a rotor with ease. As illustrated in FIG. 2, a multistage roots pump (1) in the invention includes upstream rotors (R1a, R1b, R2a, R2b) having multiple teeth, supported by a pair of revolving shafts (A1, A2); and downstream rotors (R3a, R3b-R5a, R5b) having an identical number of teeth (31) with the upstream rotors, supported by revolving shafts (A1, A2). The discharge area formed by the outer periphery of the downstream rotors (R3a, R3b-R5a, R5b) and the inner periphewy of the pump chambers (P1-P5) is smaller than that of the upstream rotors (R1a, R1b, R2a, R2b).
公开/授权文献
- US20070048162A1 Multistage root type pump 公开/授权日：2007-03-01