DEVICE FOR FORCED FLUSHING AND OILING BIT BEARING ASSEMBLY Russian patent published in 2004 - IPC

FIELD: drilling equipment, particularly device for drilling wells in mining industry with the use of roller bit with possibility of central scavenging and cleaning bottom hole by air-to-water mixture.

SUBSTANCE: device has sub with sleeve and nipple cavities separated by partition in central parts thereof and communicating one with another through longitudinal peripheral axial orifices, diametrical blind bore arranged transversely to longitudinal sub axis and having groove. Groove coincides with longitudinal peripheral orifices. Bushing with side windows communicating with axial orifice is arranged in blind bore. Roller bit is connected with sub sleeve. Roller bit has channels formed in bit legs for scavenging and oiling bit bearing assembly. Device also has central scavenging nozzle with tube fixed inside thereof. Free tube end passing into sleeve cavity is located in axial orifice. Spring-loaded single-flow end cap with slot-like orifice is rotatably installed inside busing. End cap has neck with shaped end. End cap is fixed by round nut and washer with tooth inserted in end cap groove so that slot-like orifice coincides with axial sub orifice.

EFFECT: simplified structure, increased reliability.

1 dwg