气动潜孔锤钻进用孔口密封装置优化设计

气动潜孔锤钻进具有效率高的优点，是矿山地面应急救援孔、煤层气井和水井等施工中重点考虑的工艺方法。其缺点是在钻进过程中，孔口会出现大量粉尘。孔口密封装置的作用是实现孔口的密封净化，并将返出的粉尘导向远离孔口的沉渣池。介绍了气动潜孔锤钻进用孔口密封装置的设计，并通过计算流体力学分析，对设计进行了优化，最后进行了现场试验，证明了孔口密封装置完全满足了气动潜孔锤钻进的需要。

Optimum Design of Orifice Sealing Device for Pneumatic DTH Drilling

Pneumatic DTH drilling has the advantage of high efficiency,it is a major consideration for the construction of ground emergency rescue drill,CBM wells and water wells. The disadvantage is that in the process of drilling,out of the orifice will appear a lot of dust. The function of orifice sealing device is to realize the orifice sealing and purification,and direct the dust away from the orifice oriented sediment pool. The design of orifice sealing device was introduced,and the design was opti-mized by CFD analysis. At last,field test was carried out to prove that the orifice sealing device completely meets the need of pneumatic DTH hammer drilling.