SU899895A1 - Submersible pneumatic percussive device for borehole-drilling - Google Patents

Description

(54) SUBMERGED DRILLING AIR TUBE

WELLS

one

This invention relates to submersible pneumatic breathing devices for drilling wells.

A submersible pneumatic hammer for well drilling is known, comprising a cylinder, a percussion piston housed therein, interacting with a drill bit shank and dividing the cylinder cavity into forward and reverse chambers, which are alternately connected to a source of compressed air by means of an air distributor that is formed by a central air inlet tube fixed at the rear of the cylinder and having radial holes and radial holes in the walls of the shock piston, limiting it o cavity in the tail, which includes the tube 1.

In this pneumatic impact valve, the cutting edges of the radial orifices of the tube are radially aligned, and on the piston in a straight line in the transverse direction. This adversely affects the operation of the hammer, because when the compressed air is injected and released into the chamber of the hammer, there is a gradual opening of the tube openings. Therefore, the inlet and outlet of compressed air does not occur at the full cross-section of the holes, which leads to the loss of the impact power of the hammer.

The closest to the technical essence of the invention is a submersible pneumatic hammer for drilling wells, a co-holding cylinder with a tail for the crown of the drill bit, a hammer in this cylinder, dividing its cavity into forward and reverse chambers and having an open end in the tail section the cavity and the radial holes in the walls bounding it, and in the front part of the cylinder the central air supply tube with radial holes for the passage of air, interacting with the force-unit moving relative to it rnikom for alternately supplying air to the chambers forward and return stroke through said openings 2.

In a known drummer, the cutting edges of the radial holes of the tube and the piston also have a different shape. In this regard, the inlet and outlet of compressed air occurs again not on the full cross-section of the holes, which leads to a loss of shock power of the hammer. To eliminate this drawback, a tubular valve located inside the piston is used in the hammer hammer, when it is tilted, the position of the cutting edges controlling the inlet of compressed air into the cylinder chambers changes. As a result, the shock piston paths are extended, on which air is supplied both during reverse and forward, and the power of the hammer is increased. The purpose of the invention is to increase the shock power of a pneumatic hammer due to simpler means. This goal is achieved due to the fact that the radial holes of the piston of the impactor and the central tube are made with the same shape of cutting edges. FIG. 1 shows a partial view of an air hammer, a longitudinal section; in fig. 2 is a section A-A in FIG. one; in FIG. 3: view B in FIG. 2 (enlarged scale). The pneumatic hammer has a cylinder 1 (Fig. 1 with a hammer drum 2 disposed therein dividing its cavity into a forward chamber 3 and a reverse camera 4. The hammer piston 2 interacts with the shank 5 of the drill bit (not shown), which is installed in The cylinder box 6 of the cylinder 1. The impact hammer 2 has a cavity 7 open from the end in the tail part, in the walls of which radial holes 8 and 9 are made, which enter respectively the forward chamber 3 and the reverse gear 4. The cylinder end 1 is rigidly fixed central air inlet tube 10 s radial holes 11 (Fig. 2) a piston 2 striker 2 entering the cavity 7 during its reciprocating movement. This movement is accomplished by alternately feeding compressed air into the chambers 3 and 4 of the cylinder 1 through the radial holes. 8 and 9 of the piston 2 and the radial holes 11 of the tube 10. As shown in Fig. 3, the intersecting edges 12 of the radial holes 8 and 9 are radial 2 and radial} (the holes 11 of the tube

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Claims (2)

FIG. have the same shape, in particular, in the form of a straight line in a direction transverse to the longitudinal axis. In a particular embodiment, these openings are rectangular with rounded corners. By making the cutting edges 12 of the radial holes 8, 9 and 11 of the same shape, they open to the entire flow area, which leads to a more complete filling of the chamber 3 and 4, and, consequently, to an increase in the impact power of the pneumatic impactor. An inventive Submersible Hammer for drilling wells comprising a cylinder with a bush for the shank of a drill bit, a piston hammer in this cylinder dividing its cavity into forward and reverse chambers and having a tail open at the tail end and radial holes in the walls bounding it, and in the end part of the cylinder a central air supply tube with radial openings for the passage of air, which interacts with a piston-drummer movable relative to it for alternately feeding air into each EASURES forward and return stroke through said openings, characterized in that, with a view to the Enhance its impact power, radial holes porschn impactor and the central tube are made of the same form of cutoff edges. Sources of information taken into account in the examination 1. Esin NN Submersible pneumatic impact drills for drilling a well. Novosibirsk “Science, 1976, p. 51. 2. Esin N. N. Submersible percussion pneumatic machines for drilling wells. Novosibirsk “Science, 1976, p. 64 (prototype). w .J