HOLE DRILLING DEVICE Russian patent published in 1996 - IPC

FIELD: mining equipment; arrangement of bottom part of drilling string. SUBSTANCE: in device, nozzle of jet pump is of circular configuration. It is formed by vibrator ball 3 and inner surface of pipe connection 2. Receiving chamber of jet pump is formed by pipe connection 2 and surface of lower half of ball 3. Receiving chamber is connected by radial passages 8 and axial passages 9 with above-bit section. Inner central surface of above-bit adapter 1 is tapered and widening toward washing passage of drilling bit 10. Anvil can be shaped as ball. Diameter of ball 4 is less than diameter of ball 3. Ball 4 is located without jamming in truncated spherical space of grate 5. EFFECT: high drilling efficiency. 1 cl, 3 dwg