Double Eccentric Controlled Speed ​​Abrasive Jet Cutter

Abstract

The invention discloses a double eccentric speed-controllable abrasive jet cutter, which solves the problems of complicated structure and difficult processing of the existing cutter. It specifically includes a cutting nozzle, an eccentric nozzle, a main shaft, an outer shell, a friction speed limiting ring, and a pressure housing. It is characterized in that: the opening axis of each nozzle placement groove is perpendicular to the axis of the nozzle and offset by a distance e, The axis line of the straight column section of the nozzle intersects with the axis line of the nozzle to form an eccentric angle α; corresponding fan-shaped openings are respectively set on the main shaft and the pressure shell to make it periodically change the flow area during the rotation of the main shaft , resulting in periodic changes in pressure, thereby realizing the function of speed monitoring; in addition, the tool can also choose whether to install a friction speed limiting ring and whether to use an eccentric nozzle to achieve precise control of the nozzle speed according to different displacements. The tool of the invention can complete the inner cutting of a pipe string with an inner diameter of 62mm, and has controllable speed, high cutting efficiency, low processing and manufacturing cost and simple structure.

Description

technical field [0001] The invention relates to a hydraulic jet cutting tool. Background technique [0002] Northeast Petroleum University Liu Jubao and others designed a "closed hydraulically driven adjustable speed cutter for tubing strings of Φ73mm and above (patent number: 201210346765.1)", which divides cutting tools into speed regulating system, power drive system and injection system Three parts, the speed control system is a disc brake mechanism formed by dynamic friction plate, static friction plate and spring mechanism, and the power drive system is driven by several variable diameter joints in two power tubes coiled on the shaft. Variations change the differential pressure, and several resulting couples form a dynamic moment that drives the tool to rotate and the cutting head to rotate. This tool can be used for jet cutting of small-sized casing or tubing, but the tool has a complex structure and is difficult to process, especially for the power drive system, whi...

AI Technical Summary

Problems solved by technology

This tool can be used for jet cutting of small-sized casing or tubing, but the tool has a complex structure and is difficult to process, especially for the power drive system, which needs to connect several variable diameter joints and embed them in the spiral groove to connect with the upper and lower pipe coils , any failure or leakage of the reducer will cause the drive to fail

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