Importance

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Abstract

A valve-controlled high-energy hydrostatic down-the-hole (DTH) impact hammer is provided, including an upper joint, a shell, a drainage device, an upper fixed valve sleeve, a lower fixed valve sleeve, a main valve, a piston hammer, a supporting sleeve, a sealing piston, a guiding sleeve, a stop ring, a fixing casing pipe, and a drilling bit. The impact hammer is internally defined with a first chamber, a second chamber, a third chamber and a pressure relief chamber. The first chamber is responsible for providing drilling fluid to move the piston hammer up and down by realizing the pressure change of the drilling fluid in the second and third chambers through the holes and flow channels in the upper and lower fixed valve sleeves. The impact hammer transfers the main pressure relief mode from the axis of the impact hammer to the pressure relief chamber between the supporting sleeve and the shell.

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First Claim