高能射流式液动潜孔锤回程节流缓冲研究  

Study on Fluid Damper of Fluidic Down-the-hole Hammer with High Impact Energy

作　　者：李国琳[1] 葛东 李柯柯 彭枧明[2] LI Guo-lin;GE Dong;LI Ke-ke;PENG Jian-ming(College of Computer Science and Technology,Changchun University,Changchun,Jilin 130022;Construction Engineering College of Jilin University,Changchun,Jilin 130026)

机构地区：[1]长春大学计算机科学技术学院,吉林长春130022 [2]吉林大学建设工程学院,吉林长春130026

出　　处：《液压与气动》2020年第1期93-99,共7页Chinese Hydraulics & Pneumatics

基　　金：国土资源部公益性行业科研专项(201311112);吉林省教育厅“十二五”科学技术研究项目(吉教科合字[2015]第323号)

摘　　要：在高能射流式液动潜孔锤台架试验中,硬质合金射流元件短暂工作后发生破裂。为解决此问题,提出了在中接头处设计回程节流缓冲机构。通过进行CFD动态分析,定量揭示了节流缓冲结构参数对回程冲击末速度、冲程冲击能和冲击频率以及整机压力降的影响规律。数值模拟结果表明,随着节流间隙和自由行程的减小,回程冲击末速度可以降低至不危害硬质合金射流元件的水平,而整机压力降变化极小,但会一定程度降低冲程冲击能和冲击频率。实验室台架测试结果证明,依据数值模拟结果设计的中接头处节流缓冲机构,可以有效保护硬质合金射流元件,在后续实验室和工程现场应用试验中,硬质合金射流元件没有再发生过破裂。The cemented carbide fluidic oscillator is broken after working for only 46s in a fluidic down-the-hole(DTH)hammer with high impact energy in the bench testing.Focus on the basic issue,a newly designed fluid damper in the mid tie-in is investigated.By using the transient analysis of computational fluidic dynamics(CFD),a quantitative study is conducted on the effect of structure parameters of fluid damper on the performance of backward impact velocity,impact energy,impact frequency,and the pressure drop.According to the numerical simulation results,with the decreasing of the annular gap and free stroke,the backward impact velocity will be significantly reduced to the level that does not harm to cemented carbide fluidic oscillator and the pressure drop of the DTH hammer will not change basically.However,the changing will also lead to the reduction of the impact energy and the impact frequency.The results of bench testing in laboratory and field tests show that the newly designed fluid damper with the optimal geometric parameters according to the numerical simulation can keep the cemented carbide fluidic oscillator away from damage.

关 键 词：高能射流式液动潜孔锤 硬质合金射流元件 回程节流缓冲 CFD动态分析 

分 类 号：TH137[机械工程—机械制造及自动化] TH212