Central rotary valve type hydraulic impactor

Abstract

The invention discloses a central rotary valve type hydraulic impactor. The central rotary valve type hydraulic impactor is characterized in that the upper end of an outer pipe sleeves the lower part of an upper joint, the lower end of the outer pipe is connected with a spline housing through threads, a spline on a drill bit is matched with a spline groove in the spline housing and is provided with a semicircular clamp, the outer side surface of the upper part of an upper valve seat makes sealing contact with the inner wall of the outer pipe in the outer pipe, and the middle and the lower part of the upper valve seat are inserted into an outer cylinder sleeve from a top opening of the outer cylinder sleeve; the lower part of the upper valve seat is connected with a lower valve seat through a sleeved main valve seat, a valve element is an H-shaped rotary drum and is arranged in a central hole of each valve seat, and an inner cylinder sleeves a pipe barrel on the lower part of a lower valve chamber; and the annular wall of a piston hammer with a U-shaped opening is embedded into an annular cylinder composed of the outer cylinder sleeve and the inner cylinder, and a cylindrical rod of the piston hammer penetrates through a lower cylinder sleeve and makes contact with the top face of the drill bit. The central rotary valve type hydraulic impactor has the technical effects that the volume of the valve element is reduced, the structure of a flow distribution channel is simplified, the sectional area of the fluid channel is large, and the reliability in operation is improved.

Description

technical field [0001] The invention belongs to drilling tools, in particular to a rotary valve type hydraulic impactor. Background technique [0002] Hard rock drilling has always been a common problem that restricts the development of mineral resources, deep resource exploration, underground space development and utilization, and hydropower station construction. The drilling effect in hard rock is the best. The multi-type pneumatic down-the-hole hammer and hydraulic impactor invented based on this process have also been widely used. Compared with the pneumatic down-the-hole hammer, the hydraulic impactor has low energy consumption. , cleaning and other advantages, but the existing hydraulic impactor generally has a single impact energy and impact frequency lower than that of a pneumatic down-the-hole hammer. [0003] Chinese patent CN201711459418.9 discloses a rotary valve type hydraulic impactor. Its upper joint is connected to the upper outer pipe through threads. In t...

AI Technical Summary

Problems solved by technology

[0005] In addition, the structure of the fluid channel in this patent is complex, and the sealing between each fluid channel is difficult, resulting in the loss of energy leakage of the high-pressure drilling fluid and the ineffective operation.

Images