Core valve jet-suction hydraulic down-the-hole (DTH) hammer

Abstract

The invention provides a core valve jet-suction hydraulic down-the-hole (DTH) hammer. The DTH hammer is characterized in that a valve stroke seat, a core valve and a piston which are positioned below a nozzle are sequentially arranged in a shell from the top down to form a core valve jet-suction valve control mechanism, wherein, the valve stroke seat directly controls the stroke of the core valve and free stroke of the piston; the core valve has the functions of a valve as well as a sprayer and can serve as a control element and an energy conversion element for converting kinetic energy of an operating fluid into pressure energy; and the piston is an executive component for converting liquid energy into mechanical energy to impact a hammering block to apply work, and meanwhile the piston is also a control element which is matched with the core valve to realize reciprocating impact motion. The DTH hammer has the advantages that the operating pump volume borne by the DTH hammer is 3-5 times as much as the existing jet-suction hydraulic DTH hammer with the same specification, and operating pressure drop is 0.5-1.5MPa, thus being a splitless hydraulic DTH hammer which can use high-density mud and has the advantages of high pump volume and low pressure drop; and the DTH hammer is applicable to a rotary drilling process of large-aperture drilling engineering such as petroleum drilling, water well drilling and the like, and particularly applicable to a rotary drilling process for high-pump-volume high-viscosity construction by utilizing the drilling mud.

Description

technical field [0001] The invention relates to the field of drilling machinery, in particular to a core-valve injection-suction hydraulic down-the-hole hammer used for rotary punching drilling technology in drilling engineering. Background technique [0002] Hydraulic DTH hammers have various action principles such as positive action, reverse action, double action and compound action. These DTH hammers are used in drilling projects with large pump capacity. Due to the limitation of the diameter of the DTH hammer, their valve control mechanism It is difficult to accommodate the pump volume required for drilling, so the designer mostly adopts the diversion method to solve the problem. Diversion will inevitably lead to the complex structure of the DTH hammer, the increase of useless energy consumption, and some other technical problems. [0003] The jet-suction hydraulic DTH hammer has a low utilization rate of fluid energy, and most of the fluid energy cannot be used by the ...

AI Technical Summary

Problems solved by technology

The diversion will inevitably lead to a complex structure of the DTH hammer, an increase in useless energy consumption, and also bring some other technical problems

[0003] The liquid energy utilization rate of the jet-suction hydraulic DTH hammer is low, and most of the liquid energy cannot be utilized by the piston, but is discharged through the liquid discharge channel into the drilling tool below the anvil, so this DTH hammer has a large pump volume without split flow Potential conditions, the existing jet-suction hydraulic DTH hammers are all sleeve-valve jet-suction valve control mechanisms, such as SX hydraulic impactor and HSX hydraulic DTH hammer, according to the pump volume required by oil drilling, the existing DTH hammer far from meeting the requirements

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