随钻型水力冲孔器的设计  

Design of While-drilling Type Hydraulic Punching Drilling Device

作　　者：邵国杰 Shao Guojie(X i'an Research Institute,China Coal Technology and Engineering Group,X i'an 710077,China)

机构地区：[1]中煤科工集团西安研究院有限公司

出　　处：《煤矿机械》2019年第12期12-14,共3页Coal Mine Machinery

摘　　要：针对煤矿井下“三高一低”松软煤层中瓦斯抽采效率低、抽采时间长等问题,采用水力冲孔技术,降低地应力,增加煤层渗透性,以解决瓦斯抽采问题。为提高水力冲孔效率,研制随钻型压力可调节式水力冲孔器,关键部件为流量可调节的高低压转换机构,并利用伯努利方程推导了合金喷嘴直径与高压泵泵量和压力之间的变化规律。室内实验和现场试验结果表明:实际工况下,流量可调节的高低压转换机构可实现不同流量下高低压临界状态控制,稳定可靠;优选的合金喷嘴直径能满足水力冲孔要求,与理论研究相一致。Aiming at the problems of low gas drainage efficiency and long extraction time in the three high and one low soft coal seams in coal mines,hydraulic punching technology was adopted to reduce the ground stress and increase the coal seam permeability to solve the gas drainage problem.In order to improve the hydraulic punching efficiency,a while-drilling type hydraulic punching device with pressure—adjustable was developed.The key components were high-low—pressure conversion mechanism with adjustable flow rate.The Bernoulli equation was used to derive the law of change between the diameter of the alloy nozzle and the pumping capacity and pressure of the high-pressure pump.The results of laboratory tests and field tests show that under the actual working conditions,the high-low pressure conversion mechanism with adjustable flow rate can realize the control of high and low pressure critical state under different flow rates,which is stable and reliable.The preferred alloy nozzle diameter can meet the requirements of hydraulic punching,and be consistent with theoretical research.

关 键 词：松软煤层 瓦斯抽采 水力冲孔 结构设计 

分 类 号：TD712.63[矿业工程—矿井通风与安全]