FLUSHING ASSEMBLY OF DRILLING BIT Russian patent published in 2014 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: flushing assembly of a drilling bit includes a head piece located in a flushing pass seat of the bit housing and fixed by means of a threaded bushing, between the upper end face of which and the seat bottom an additional bushing with radial holes and a sealing element are installed. The additional bushing is provided with several through axial holes and sleeves from elastic material, which are fixed on its outer and inner surfaces so that they can interact with walls of the flushing pass seat and the head piece; with that, the lower end face of the additional bushing has a convex shape, and the upper end face of the sealing element has a mating concave shape.

EFFECT: improving operating efficiency of the flushing assembly and the whole bit.

2 cl, 1 dwg