文献类型：专利

英文题名：Stress reducing structure integrated hermetic seal drill rod joint, has cone pipe thread connected with inner screw thread piece and outer thread piece, and external thread part located in thread outer platform shoulder surface

作者：XU L;YANG R;LU X;LIU G;GAO L

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN205778591-U

申请日：2016-05-03

公开日：2016-12-07

语种：英文

收录：DERWENT

摘要：NOVELTY - The utility model claims a hermetic seal drill rod joint with stress reducing structure, the drill rod joint comprises the cone pipe thread connected with inner screw thread and outer screw thread, internal and external threads are formed interference fit; inner screw member comprises a vertical to the axial direction of the first outer platform shoulder face, a long straight cylindrical hole are axially extending, internal thread, spherical surface and the first inner shoulder surface; external thread member includes a second inner shoulder surface end and a long straight cylindrical surface extending axially in turn, an external thread, a cylindrical surface and a second outer platform shoulder face; a stress reducing groove between the long straight cylindrical surface and second inner shoulder surface, spherical surface and cylindrical surface of the external thread part of the inner thread element form a spherical/cylindrical surface sealing. The utility model has good connecting intensity and sealing performance, and can effectively improve the condition of stress extreme value and stress distribution of the drill stem joint. torsion resistance is very superior.