| 摘要 |
An improved rotary cone rock bit that provides a cross flow through the drill bit dome to reduce bailing and improve the efficiency of the drilling operation. The rotary cone rock bit has a bit body with a pin at its upper end adapted to connect to a drill string. The lower end of the bit body has three leg segments extending from its periphery in a downward direction. Drilling cones rotatably mounted to each leg segment provide the cutting action of the rock bit. The conical drilling cones extend from the leg segments toward the center axis of the rotary cone rock bit with the smaller diameter end distal the leg segments. The rotary cutter cones and the lower end of the bit body define a dome therebetween. Nozzles extend downward from the base areas between the leg segments. The nozzles are in flow communication with an opening in the bit body that transmits fluid from the drill string therethrough. The nozzles direct fluid toward the dome to create a Cross flow therethrough. The rock bit may include any number of nozzles and may combine the nozzles with others that direct fluid toward the bottom of the bore hole for increased lubrication. Basically, the nozzles include a body having a longitudinal cavity therein. A nozzle exit directs fluid from the cavity and direct the fluid toward the dome. Alignment dowels ensure that the nozzle exit remains aligned toward the dome.
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