SU112264A1 - Electrohydrodynamic drive for keys for screwing and unscrewing drill pipes and other pipes - Google Patents

Description

The invention relates to mechanisms for screwing and unscrewing drill pipes.

The known electric drivers of mechanical keys used in drilling and underground repair of wells for screwing and unscrewing pipes do not satisfy the loading characteristics of the key mechanism, since they do not have reliable torque controllers or any other protective means against pipe breaks. or key and actuator parts with an emphasis occurring in a threaded joint at the end of the pipe screwing process, i.e. when tightening the threaded joint.

The described electrohydrodynamic drive for the keys differs from the known ones in that, in order to eliminate the mentioned drawbacks, a hydrodynamic coupling is used as a limiter and regulator of the torque value, which is regulated by filling the working cavity with liquid. When overloading such a coupling

begins to slip to a complete stop of the driven part of it, while the electric motor continues to work in normal mode.

In order to transmit the maximum moment needed to unfasten the threaded joint when unscrewing it, the driving and driven parts of the coupling are rigidly closed together to form a single flywheel, the kinetic energy of which is transmitted in the form of a blow to the key and then to the pipe, in the direction of unscrewing it. This measure allows one to obtain virtually unlimited pipe torque when unscrewing.

The drawing shows a diagram of an electro-hydrodynamic drive device to the keys for screwing and unscrewing drill pipes and other pipes. It consists of an electric motor ./, on the shaft of which a flywheel 2 is seated, the inner part of which is a turbo coupling cavity with pumping blades 3. On the outer surface of the flywheel hub the turbine wheel 4 of the turbo coupling freely rotates

moreover, the wheel hub, brought out through the seal, ends with the driving floor coupling 5. On the driven shaft 6 of the mechanical key, on the splines or key there is a short coupling half 7, which is activated by the handle 8.

The amount of torque can be adjusted by changing the filling ratio of the turbo coupling of the working fluid. For this purpose, a valve 9 is installed in the flywheel rim, and holes are made on the mechanism casing corresponding to different valve positions P and, consequently, to different degrees of filling of the turbo coupling corresponding to the transmitted moments.

Prevention and Consideration

Electro-hydrodynamic drive to the keys for screwing and unscrewing the drill and the other pipes, providing for limiting and controlling the torque, by using an adjustable hydrodynamic clutch.

characterized in that, in order to obtain an increase in the kinetic energy of the rotating flywheel, necessary to unscrew the pipe and eliminate the adverse effect of rotating masses on the safety of the threaded connection when screwing the pipe, the hydraulic clutch has an integral flywheel of the electric motor so that when screwing the pipes, the torque from the shaft the electric motor to the drive shaft of the key is transmitted successively through the hydraulic coupling and the friction clutch, the flywheel mine, and the magnitude of the moment is due to the degree of filling olosti clutch hydraulic fluid and unscrewing fluid coupling driven portion fixedly connected to the flywheel by means of bolts or other fixture and torque is transmitted through a flywheel and friction clutch, the magnitude of its corresponding kinetic energy vrap1ayuschegos flywheel.