SUBMERGED-TYPE ELECTRIC PULSE DRILL Russian patent published in 2013 - IPC E21C37/18 E21B4/12 

FIELD: mining.

SUBSTANCE: submerged-type electric pulse drill is intended for drilling of wells and driving of shafts in hard mine rocks destructed with high-voltage discharges developed in them, and can be used in mining industry. Drill head (6) is attached to lower flange of drill (2) housing. In drill (2) housing there coaxially installed is washing pipeline (1) that is passed through the drill cover plate (3) and high-voltage insulator (5) provided with insulation ribs (8), which are inclined towards drill head (6), which provides collection of impurities in annular sump tank (9) and their removal from the drill through discharge valve (10) by increasing the gas pressure in it, thus multiply increasing the service life of insulation elements of the drill. It is facilitated with the diameter of lower high-voltage insulator (5) exceeding its support rib (7) in comparison to inner diameter of mounting flange (11). In order to increase the drill service life and reduce the time required for its maintenance, high-voltage pulse source is made as per Arkadyev-Marx scheme, capacitors (17) of which are arranged around washing pipeline (1) and assembled to detachable capacitor sections, each of which includes one or more capacitors (17), two buses (19), two charge elements and support insulator (20).

EFFECT: invention allows increasing the service life of the device, simplifying its maintenance, and removing and re-installing individual detachable parts without complete removal of the generator.

3 cl, 3 dwg