Impeller type axial and circumferential compound impactor

[0022] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0023] Referring to the figure, the impeller-type axial and circumferential composite impactor is composed of a conversion joint 1, a motor assembly and an impact assembly. The rear end of the motor assembly is threaded to the conversion joint 1, and the front end is connected to the impact assembly; The assembly includes the impeller housing 2, the lock nut 3, the impeller 4, the impeller shaft 5, the bearing end cover 6, the screw 7, the string bearing 8 and the deflector tube 10. The impeller 4 is installed on the impeller shaft 5 through a spline connection. , And use the lock nut 3 to axially fix, the front section of the impeller shaft 5 is installed in the guide tube 9, and the string bearing 8 is installed inside the guide tube 9, and the bearing end cover 6 is installed on the end surface of the guide tube 9 through a threaded connection , 3 uniformly distributed holes are opened on the outer cylindrical surface of the guide tube 9, and 3 evenly distributed threaded holes are opened on the cylindrical surface of the impeller housing 2 where the guide tube 9 is installed. Fixed on the impeller housing 2.

[0024] The impact assembly includes a rotary valve 11, a valve cover 12, a hammer head 13, a sleeve 14, a hammer cylinder 15, an impact housing 16, a locking cylinder 17 and a lower joint 18. The rear end of the rotary valve 11 is threaded Fixed at the front end of the impeller shaft 5, a wear ring 10 is placed between the rotary valve 11 and the steps of the impeller shaft 5. The valve cover 12 is installed on the end surface of the hammer cylinder 15, and the hammer head 13 is installed on the valve cover 12 and the hammer cylinder 15. In between, the hammer cylinder 15 is installed inside the impact housing 16, and the lower joint 18 is axially fixed on the impact housing 16 through the threaded connection of the locking cylinder 17 and the hammer cylinder 15. The hammer cylinder 15 and the impact housing 16 is fixed circumferentially with the lower joint 18 by means of jaws, and the sleeve 14 is installed between the guide tube 9 and the hammer tube 15; the impeller 4 of the motor assembly converts liquid energy into rotating mechanical energy, thereby driving the impact The rotary valve 11 of the assembly rotates. Because there are holes in the rotary valve 11 and the valve cover 12, the drilling fluid periodically enters the cavity of the hammer head 13 and the hammer cylinder 15, and the hammer head 13 periodically hits under the push of the liquid. The hammer cylinder produces a circumferential shock. At the same time, the axial holes of the rotary valve 11 and the valve cover 12 are periodically misplaced to change the liquid pressure, which generates high-frequency axial vibration, and transmits the axial and circumferential impact force through the lower joint 18 The drill bit eliminates stick-slip phenomenon and improves rock breaking efficiency.

[0025] The front end of the rotary valve 11 has two symmetrical fan-shaped holes, and two symmetrical circular holes are opened in the circumferential direction of the rear cylinder. The rotary valve 11 is driven by the impeller 4 to rotate, and under the action of the valve cover 12 The liquid pressure is changed periodically to produce axial vibration and impact; the valve cover 12 has 4 fan-shaped liquid inlet holes, including two impact liquid inlet holes and two reset return liquid inlet holes. The rotary valve 11 rotates to make The liquid periodically enters the impact liquid inlet and the reset return liquid inlet, and enters the cavity of the hammer 13 and the hammer barrel 15 through the liquid inlet. The hammer 13 is driven to rotate at the gap of the hammer barrel 15 by hydraulic pressure, and the liquid is removed from the impact The liquid inlet enters and pushes the hammer head 13 to hit the hammer cylinder 15 in the positive direction, and the liquid enters from the reset return inlet hole to push the hammer head 13 back in the circumferential direction, and the cross-sectional area of ​​the impact inlet hole is larger than the area of ​​the reset return inlet hole Large, single-circumferential impact can be achieved.

[0026] The rear end of the guide tube 9 is provided with four notches to facilitate clamping and installation, and seal grooves are opened in the guide tube 9 and the bearing end cover 6, and the two ends of the guide tube 9 are sealed by installing sealing rings. This prevents liquid from entering the string bearing 8.

[0027] The hammer cylinder 15 of the impeller-type axial and circumferential composite impactor has two stepped notches evenly distributed at the impact end, and internal threads are machined at the front end for matching with the external threads of the locking cylinder 17.