【摘要】 为了确保钻井液液压至钻头时，破岩机械能快速变换，保证轴向振动周期性，同时与高频低幅周向碰撞，设计了一种新型小尺寸复合冲击器结构。基于Ansys有限元分析表明，活塞锤最大应力为98 MPa，远低于材料屈服强度，满足安全要求。冲击扭矩计算与活塞尺寸优化表明，这一设计中以二级活塞为主,二级活塞试算轴向冲击力达15 kN，结构设计合理。流场分析表明在液流通过喷嘴情况下，内径越来越小，致使速度越来越大，产生高速液流。上腔与下腔形成液压差，表明冲击器与使用要求相符，验证了液压差驱动冲击器的有效性。更多还原

【Abstract】 In order to ensure that the mechanical energy for rock breaking can be rapidly transformed when the drilling fluid is hydraulically delivered to the drill bit, and to guarantee the periodicity of the axial vibration while simultaneously achieving high-frequency and low-amplitude circumferential collisions, a new type of small-sized composite impactor structure is designed. Based on the Ansys finite element analysis, the maximum stress of the piston hammer is 98 MPa, which is far below the material’s yield strength, meeting the safety requirements. The calculation of the impact torque and the optimization of the piston size indicate that in this design, the secondary piston is the main component. The secondary piston’s trial calculation of the axial impact force reachs 15 kN, demonstrating a reasonable structural design. The flow field analysis shows that as the liquid passed through the nozzle, the inner diameter gradually decreases, resulting in an increasing velocity and the generation of high-speed liquid flow. The hydraulic pressure difference forms between the upper and lower chambers indicates that the impactor met the requirements, verifying the effectiveness of the hydraulic pressure difference in driving the impactor.更多还原