| 摘要 |
<p>A drilling bit having an irrigation system which uses an irrigating fluid. The bit comprises a hollow drill head (14) housing at least one fluidic oscillator (23, 23') which includes an accelerator nozzle (26, 26') supplied by said fluid and opening into a cavity (46, 46') in which a dividing element (34, 34') is mounted which is provided with a ridge (36, 36') located slightly downstream from the nozzle. Said dividing element defines in said cavity two passages (42, 44, 42', 44') towards which the fluid is alternately directed in pulsed jets. Said passages are linked respectively to two series of channels (16 to 22) which open onto the outer surface of the head (14) through a plurality of outlet openings (21) which are oriented so that the pulsed jets they give out are directed to selected portions of the head that need to be cleaned, cooled or lubricated.</p> |
