射流式液动锤活塞回程缓冲机构  

Buffering the Backward Impact of Piston of Liquid-Jet Hammer

作　　者：张永光[1] 彭枧明[1] 柳鹤[1] 殷其雷[1] 范黎明[1] 

机构地区：[1]吉林大学建设工程学院/国土资源部复杂条件钻进技术开放研究实验室/教育部地球探测技术与仪器重点实验室,长春130026

出　　处：《吉林大学学报（地球科学版）》2010年第6期1415-1418,1424,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家'863'计划项目(2006AA06A109-3-2-1)

摘　　要：CFD动态分析了回程缓冲机构不同弹簧刚度系数对射流元件控制道内流动特性和活塞回程冲击速度的影响。实验结果表明:缓冲机构施加在活塞上的弹簧作用力不会影响射流元件主射流的正常附壁和切换,刚度系数较大的弹簧可以显著降低活塞回程冲击速度,减小回程中活塞对射流元件的冲击;弹簧增幅在5倍时,活塞回程冲击速度降幅为52.88%,有效避免了射流元件中硬质合金零件在工作中发生断裂的现象。The effect of rigidity of buffering spring on the flowing character of the liquid in the controlling passages of fluidic element and the backward impact velocity of the piston is studied by means of CFD dynamic analysis and is validated by experiments.The results show that exerting spring force axially on the piston has no effect on the switch of the main jet in the fluidic element,and buffering spring with proper rigidity can make the backward impact velocity decrease greatly,the backward impact velocity of the piston will reduce 52.88% when rigidity of spring enhances five times,which is helpful for reducing impact loads and keeping the parts made of tungsten carbide in the fluidic elements from breaking when the liquid-jet hammer works in well drilling.

关 键 词：活塞 回程缓冲 主射流切换 CFD动态分析 

分 类 号：P634.4[天文地球—地质矿产勘探]