| 摘要 |
FIELD: mining. ^ SUBSTANCE: high-pressure bit nozzle is made in the form of confuser with straight-line channel section. Nozzle diametre do is chosen depending on density of flushing fluid, supply of drilling pump, nozzle resistance coefficient, nozzle opening degree, flow coefficient of supply channels, flow coefficient of nozzle, number of nozzles in the bit, the pressure created with the drilling bit, and length of straight-line nozzle section is determined by the formula äô=Kd0, where äô - length of straight-line channel section; K - trial coefficient (K=0.510.53). Wear resistance of the material of the working nozzle part is higher than wear resistance of the material of its rest part. ^ EFFECT: increasing the drilling efficiency and reducing the cost of the drilling process. |
