公开(公告)号：US4812110A

公开(公告)日：1989-03-14

申请号：US79397

申请日：1987-07-30

申请人： Kazuo Kubo ,  Noboru Tsuboi ,  Kunihiko Nishitani ,  Ituro Nomura

发明人： Kazuo Kubo ,  Noboru Tsuboi ,  Kunihiko Nishitani ,  Ituro Nomura

IPC分类号： F04C29/04 ,  F04C18/16

CPC分类号： F04C29/042

摘要： Described herein is a method for operating an oil-free screw compressor and an oil-free screw compressor construction, the method including the step of feeding a gas of a temperature Ta to a discharge space in the vicinity of the discharge port of the compressor, the temperature Ta satisfying the relationshipTa.ltoreq.Tl/kwherein Ta is the temperature (.degree.K.) of said feed gas; Tl is the temperature (.degree.K.) of the compressed gas before feeding; and k is a polytropic index number.

摘要翻译： 这里描述了一种操作无油螺杆压缩机和无油螺杆式压缩机结构的方法，该方法包括将温度Ta的气体供给到压缩机排出口附近的排放空间的步骤， 满足关系Ta

公开(公告)号：US4781553A

公开(公告)日：1988-11-01

申请号：US77219

申请日：1987-07-24

申请人： Ituro Nomura ,  Kunihiko Nishitani ,  Noboru Tsuboi

发明人： Ituro Nomura ,  Kunihiko Nishitani ,  Noboru Tsuboi

IPC分类号： F04C27/00 ,  F04C18/16 ,  F04C29/02 ,  F16J15/16

CPC分类号： F04C27/009 ,  Y10S277/927

摘要： A screw vacuum pump which includes a casing having a rotor chamber opened at its one end to a suction opening and opened at the other end to a discharge opening; a pair of male and female screw rotors rotatably received in the rotor chamber, each of the screw rotors having a pair of rotor shafts supported by forcibly lubricated bearings on both sides of the suction opening and the discharge opening; at least one first sealing member provided between the bearing on at least the suction opening side and the rotor chamber and communicated with a space under pressure less than atmospheric pressure which space is out of communication with the suction opening; and at least one second sealing member provided between the bearing on at least the suction opening side and the rotor chamber and communicated with the atmosphere, the first and second sealing members being arranged in this order from the rotor chamber side.

摘要翻译： 1.一种螺杆式真空泵，其特征在于，具有壳体，该壳体的一端部与吸入口开放，另一端开放于排出口， 一对可旋转地容纳在转子室中的公螺纹转子和内螺纹转子，每个螺杆转子具有一对转子轴，该转子轴由吸入口和排出口两侧的强制润滑轴承支承; 至少一个第一密封构件，设置在至少所述吸入口侧的所述轴承和所述转子室之间，并且在与所述吸入口不相关的空间下与空气压力小于大气压的空间连通; 以及至少一个第二密封构件，设置在所述轴承至少所述吸入口侧和所述转子室之间并与所述大气连通，所述第一密封构件和所述第二密封构件从所述转子室侧依次配置。