OUTER ROTARY DOWNHOLE DRILL Russian patent published in 2018 - IPC E21B4/02 E21B25/00 

FIELD: mining.

SUBSTANCE: drill comprises, at least, two coaxial rotor sections interconnected by an intersection sleeve made with the transition passages of the working body and plugs located at the ends of the rotor sections. The plug located on the end part of the rotor section along the bottom direction contains rock-destroying elements and is made with an exit channel for the working body. The plug located on the end part of the rotor section towards the mouth, is provided with an input channel for the working body. Each rotor section contains a stator with channels for the working body, which is an axis, and an external rotor with screws located on its outer surface. In the inner part of the stator, a hollow core-receiving housing is installed. The clamps are provided on the inner surface of the outer rotor, in which the rotor roller is mounted, and a radial recess is provided on the outer surface of the stator, in which a spring-loaded damper with a stator roller is located. The stator roller and the rotor roller located between the inner surface of the rotor and the outer surface of the stator form a working chamber. The channels for the working body, made in the stator, are connected to the working chamber of each rotor section by the channels for the transfer of the working body.

EFFECT: increasing the specific power due to the increase in torque with increasing reliability and efficiency of the device.

6 cl, 2 dwg