A rotary valve type hydraulic impactor

Abstract

The invention discloses a rotating-valve-type hydrodynamic impactor. An upper connector of the rotating-valve-type hydrodynamic impactor is connected with an upper outer pipe through a thread, a glandand a valve cover are sequentially fixed to the upper end face of a cylinder body through the upper connector, the cylinder body is sleeved with the upper outer pipe, and the periphery of the upper end of the cylinder body is sleeved with a freely-rotating rotor sleeve. Various vertical and radial fluid channels are formed in the cylinder body, a piston is formed by means of the method that an upper piston head and a lower piston head are connected to a piston rod in series, and according to the piston, the upper piston head and the lower piston head are machined on the piston rod. An end cover is inserted into the lower end of the cylinder body and positioned by a positioning pin, a middle connector is connected with an upper outer pipe and a lower outer pipe through threads, and the piston rod penetrates through the end cover to be connected with a hammer body to form a movement whole. A spline sleeve is connected with the lower outer pipe through a thread, a spline on a drill bit body is matched with a spline groove in the spline sleeve, an assembled body capable of axially moving is formed, and the lower bottom face of the hammer body makes contact with the top face of a drillbit. The rotating-valve-type hydrodynamic impactor has the advantages that the clamp-blocking problem caused by a slide valve is avoided, the structure is simple, impacting energy is large, and the service life is long.

Description

technical field [0001] The invention belongs to drilling tools, and in particular relates to a hydraulic impactor, which is widely used for fast drilling of hard rock. Background technique [0002] With the shortage of shallow energy and resources, deep ore prospecting, deep oil and gas exploration, and hot dry rock development and utilization have been implemented one after another. Improving the efficiency of drilling footage in deep hard formations is an important way to reduce the cost of various drilling projects. Compared with rotary drilling technology, percussion drilling technology has significant advantages in the field of drilling in hard formations, and hydraulic hammers with various structures have been developed. However, various hydraulic impactors have problems such as complex structure, low service life, and small impact energy, which limit the application of hydraulic impactors. [0003] Chinese patent document CN104405280A disclosed a stroke differential ...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the existing hydraulic impactor, the technical problem to be solved by the present invention is to provide a rotary valve type hydraulic impactor, which can avoid the jamming problem caused by the slide valve, and has a simple structure, large impact energy, and easy to use. long life

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