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    • 10. 发明公开
    • SINGLE STAGE ROOTS VACUUM PUMP AND VACUUM FLUID TRANSPORT SYSTEM EMPLOYING THAT SINGLE STAGE ROOTS VACUUM PUMP
    • EINSTUFIGE ROOTS-VAKUUMPUMPE UND DIE EINSTUFIGE ROOTS-VAKUUMPUMPE EINSETZENDES VAKUUMFLUIDTRANSPORTSYSTEM
    • EP1967735A1
    • 2008-09-10
    • EP06843211.1
    • 2006-12-26
    • Sekisui Chemical Co., Ltd.
    • OHTSUKA, TetsushiITO, Yosinobu
    • F04C18/18F04C25/02F04C28/04F04C29/12
    • F04C18/126F01C21/007F04C28/04F04C29/12F04C2220/10F04C2250/101
    • [Problems]
      To provide a single stage root type-vacuum pump which can prevent an increase in an installation space while achieving a fine anti-corrosion property, and can shorten discharge time by preventing a drop in a pumping flow rate when pumping by reverse rotation, and to provide a vacuum fluid transport system employing this single stage root type-vacuum pump.
      [Means for Solving the Problems]
      A pair of outside air introduction holes (22, 22) is formed in the vicinity of a phantom line (m) in an inner wall surface (6c) within a range between intersecting points (q, q), where the intermediate position (p) is located between the center of a driving side Root type-s rotor shaft (11) and the center of a driven side Root type-s rotor shaft (12) of three-lobe rotors (20, 21), and where the intersecting points (q, q) are the points at which internal circles located on the extended circumferences of the inner wall surface (6c) of the casing (6) intersect with the intermediate position (p). The pair of outside air introduction holes (22, 22) is formed in symmetrical positions into horizontally long slit shapes parallel to a width direction of the casing. Check valves (27) are fitted to tip end portions (26a, 26a) of outside air introduction pipes (26, 26) which are respectively connected to outside air communication holes (24, 24) so as to avoid air from escaping at the time of reverse rotation of the three-lobe rotors (20, 21).
    • [问题]提供一种单级根型真空泵,其可以防止在提供良好的防腐蚀性能的同时增加安装空间,并且可以通过防止在通过反向旋转泵送时泵送流量的下降来缩短放电时间 并提供采用这种单级根真空泵的真空流体输送系统。 解决问题的手段在交叉点(q,q)之间的范围内的内壁面(6c)中的虚线(m)附近形成有一对外部空气导入孔(22,22) ,其中中间位置(p)位于驱动侧根型转子轴(11)的中心与三叶转子(20,...)的从动侧根型转子轴(12)的中心之间, 21),并且其中交点(q,q)是位于壳体(6)的内壁表面(6c)的延伸圆周上的内圆与中间位置(p)相交的点。 一对外部空气导入孔(22,22)形成为与壳体的宽度方向平行的水平长的狭缝形状的对称位置。 止回阀(27)安装在分别连接到外部空气连通孔(24,24)上的外部空气导入管(26,26)的前端部分(26a,26a)上,以避免空气逸出 所述三叶片转子(20,21)的反转。