公开(公告)号：US4823890A

公开(公告)日：1989-04-25

申请号：US159358

申请日：1988-02-23

申请人： Alan F. Lang

发明人： Alan F. Lang

IPC分类号： E21B21/10 ,  E21B21/12

CPC分类号： E21B21/12 ,  E21B21/10 ,  Y10T137/7854

摘要： A reverse circulation deep hole rock bit that includes a drill bit connector tube telescopically extended into a drill bit housing to cooperatively form a part of a radial inner fluid channel for cuttings to flow axially outwardly and a radial outer annular clearnace space, a plurality of angularly spaced pressurized fluid passage that open to the annular space and a check valve in each fluid fluid passage to permit inward flow of fluid, but to block fluid flow in the opposite direction. A plurality of angularly spaced cutter arms have arcuate tubular segments secured to axial and radial outer portions of the arms while a radially inner tubular skirt is secured to or abuts against the axial outer portions of the arms. The combination of segments, arms and skirt are secured to the housing to extend inwardly thereof with the skirt forming part of the radial inner return channel while each passage opens to a separate chamber angularly between adjacent arms to direct pressurized fluid to flow between the rotary cutters that are mounted by the arms and convey cuttings outwardly through the radial inner fluid channel.

摘要翻译： 一种反向循环深孔岩石钻头，其包括可伸缩地延伸到钻头壳体中的钻头连接管，以协同地形成径向内部流体通道的一部分，用于切割轴向向外流动，并且径向外部环形楔形空间，多个角度 间隔开的加压流体通道，其通向环形空间，并且在每个流体流体通道中具有止回阀，以允许流体向内流动，而阻止流体沿相反方向流动。 多个角度间隔开的切割臂具有固定到臂的轴向和径向外部部分的弓形管状段，而径向内部管状裙部固定到或抵靠臂的轴向外部。 节段，臂和裙部的组合固定到壳体上，其中裙部形成径向内部返回通道的一部分，而每个通道在相邻臂之间成角度地打开到单独的室，以引导加压流体在旋转切割器之间流动 其通过臂安装并且通过径向内部流体通道向外传送切屑。