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71. 发明授权

US5513711A Sealed and lubricated rotary cone drill bit having improved seal protection 失效
标题翻译：密封和润滑的旋转锥钻头具有改进的密封保护
公开(公告)号：US5513711A
公开(公告)日：1996-05-07
申请号：US299484
申请日：1994-08-31
申请人： Mark E. Williams
发明人： Mark E. Williams
IPC分类号： E21B10/22 , E21B10/25
CPC分类号： E21B10/25
摘要： A rotary cone drill bit (10) for forming a borehole includes a support arm-cutter assembly (26). A support arm (28) is integrally formed with the drill bit's body (22) with a spindle (30) machined integral thereto. The assembly (26) includes a cutter (12) with a cavity (34) for receiving the spindle (30). An inner seal gland (44) is formed between the spindle (30) and a wall (42) of the cavity (34). An elastomeric seal (46) is disposed in the inner seal gland (44) to form a first fluid barrier between. An outer seal gland (50) is formed between the spindle (30) and the cavity wall (42) and between the inner seal gland (44) and the borehole. A ring (56) is disposed in the outer seal gland (50) to rotate with the cutter (12). The ring (56) has a peripheral hole (58) therethrough. A gas conduit (60) is disposed within the support arm (28) for directing a flow of a gas, such as air, into the outer seal gland (50). From the outer seal gland (50), the gas is directed through the hole (58) in the ring (56) and exits into the borehole to form high velocity jets of air to dean a mating surface between the arm (28) and the cutter (12) preventing borehole debris from entering the inner seal gland (44).
摘要翻译：用于形成钻孔的旋转锥形钻头（10）包括支撑臂 - 切割器组件（26）。支撑臂（28）与钻头的主体（22）一体地形成有与其一体加工的主轴（30）。组件（26）包括具有用于容纳主轴（30）的空腔（34）的切割器（12）。在所述心轴（30）和所述空腔（34）的壁（42）之间形成内密封压盖（44）。弹性体密封件（46）设置在内密封压盖（44）中以在其间形成第一流体屏障。在所述主轴（30）和所述空腔壁（42）之间以及所述内部密封压盖（44）和所述钻孔之间形成有外部密封压盖（50）。环（56）设置在外密封压盖（50）中以与切割器（12）一起旋转。环（56）具有穿过其的周边孔（58）。气体管道（60）设置在支撑臂（28）内，用于将诸如空气的气体流引导到外密封压盖（50）中。从外部密封压盖（50），气体被引导通过环（56）中的孔（58）并且离开到钻孔中以形成高速喷射的空气，以使臂（28）和切割器（12）防止钻孔碎屑进入内密封盖（44）。

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