Pressurized fluid flow system for a reverse circulation hammer

Details Pressurized fluid flow system for a reverse circulation hammer Pressurized fluid flow system for a reverse circulation hammer

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 10/38 (2006.01)

Patent

CA 2650356

A pressurized fluid flow system for a reverse circulation down-the-hole hammer comprising a cylinder (40) coaxially disposed in between the outer casing (1) and the piston (60); and two chambers (2, 3) defined by respective recesses on the inner surface of the outer casing (1) and separated by a dividing wall (5). During the operation of the hammer, the first chamber (2) is permanently connected to the source of pressurized fluid for supplying said fluid to a front chamber (240) and to a rear chamber (230) formed inside the hammer and located at opposite ends of the piston (60) for enabling it to reciprocate due to the changes in pressure of the pressurized fluid contained therein; and the second chamber (3) is permanently communicated with the bottom of the hole for discharging the pressurized fluid from said chambers (240, 230); wherein the flow into and out of said chambers (240, 230) is controlled solely by the overlap or relative position of the piston (60) and the cylinder (40). In a second embodiment of the invention the control of the flow of the pressurized fluid into the chambers (240, 230) is achieved by the overlap of the sampling tube (130) extending along the center of the hammer, with the inner sliding surfaces (69) of the piston (60); while the flow of the pressurized fluid out of the chambers (240, 230) is controlled by the overlap of the piston (60) and the cylinder (40). An internal chamber (74) is provided in between the piston (60) and the sampling tube (130) for a more efficient filling of the chambers (240, 230), said internal chamber (74) being defined by a recess of said surfaces (69) of the piston (60) and being permanently connected the supply chamber (2).

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