SU1652499A1 - Drilling bit flushing device - Google Patents

Abstract

The invention relates to a rock demolishing tool. The purpose of the invention is to reduce the cost of the node by simplifying the design and manufacturing technology while reducing the time spent on its assembly and disassembly. The assembly includes a housing 1 with a pressure channel 2 and a socket 3 in which a nozzle 6 is installed, fixed by means of a locking rod 5 installed in an annular groove 4 through a channel drilled in the housing 1. A sealing ring 7 is installed between the end of the nozzle 6 and the bottom of the socket 3, the height of which in the free state must be greater than the gap between the end face of the nozzle 6 and the bottom of the socket 3 in the working position. The nozzle 6 is made with a conic-cylindrical surface, the interface between which interacts with the rod 5. The taper angle of the outer surface of the nozzle is 5-10 °. 1 hp f-ly, 3 ill. (L S about ate NJ N Yu O 75 Figure 1

Description

The invention relates to a rock demolishing tool, namely to their washing units.

The purpose of the invention is to reduce the cost of the wash unit by simplifying the design and manufacturing technology, while at the same time reducing the time required for its assembly and disassembly.

Figure 1 shows the wash unit, in section; figure 2 - section aa in figure 1; FIG. 3 shows an embodiment of the sealing assembly.

The flushing unit includes a housing 1 with a pressure channel 2 and a socket 3, in which an annular groove 4 is made under the locking rod 5. A nozzle is installed in the socket b. between the end of which and the bottom of the socket 3 is installed a sealing ring 7, which may have a cross-sectional shape of a rectangle (Fig. 1), a right triangle (Fig. 3), a circle, etc. The nozzle 6 is made with a stepped outer surface, the input of the stage 8 of which has a cylindrical shape, and the output stage 9 - the shape of a reverse cone with a taper angle a equal to 5-10 °. In the working position, the plane of the large base of the conical stage 9 is aligned with the plane of the edge 10 of the annular groove 4, closest to the bottom of the socket 3, which is achieved due to deformation of the sealing ring 7. The diameter of the larger base of the conical stage Dk of the nozzle 6 is smaller than the diameter of its cylindrical part This, the interface of the conical and cylindrical stages 8 and 9 serves as a support in contact with the locking rod 5, which is introduced into the groove 4 through the tangential channel 11 in the housing 1. The mouth of the channel 11 has a notch 12 along head 13 of the locking rod 5 (2)

The sealing ring 7 is located between the end of the nozzle 6 and the bottom of the socket 3, and the height of the sealing ring 7 in a free state is greater than the gap between the end of the nozzle and the bottom of the socket 3.

Fig. 3 shows a variant of mounting the sealing ring 7 in the form of a rectangular triangle in a groove formed between the walls of the nest 3. and beveling the nozzle b. A variant of the groove for the sealing ring 7 and at the bottom of the nest 3 is possible. To prevent the locking rod 5 from being eroded A protective screen 14 in the form of an elastic ring with a locking collar 15 installed in the annular groove is provided by the reflected flow of the washing liquid.

housing 1. Screen 14 is installed in the cavity formed by the walls of the socket 3, the conical surface of the nozzle 6 and the locking rod 5.

The installation of the flushing unit is carried out in the following sequence. First, install the sealing ring 7, then the nozzle 6 is inserted into the slot 3, which is fixed against axial movement by the locking rod 5. The latter is inserted into the annular groove 4 by hammer blows, while the head 13 of the locking rod 5 is embedded in the recess 12, and the ring 7 is pressed against the nozzle end b bottom

slots 3. Thereafter, a protective shield 14 is installed in the slot 3, which protects the rod 5 from erosion.

The disassembly of the assembly is carried out in reverse order, and in the event of the head 13 of the rod 5 being torn off, the latter is knocked out with a special tool, which can be brought into contact with the rod 5 through a conical groove between

body 1 and nozzle 6. after removing the protective screen 14, the V-shaped cross section of which provides ease of deformation, which is necessary for ease of mounting and dismounting, and on the other hand, it creates an expanding force that will reliably fix the ring in the cavity of the socket 3 .

The proposed wash unit due to its simpler design will allow

greatly simplify the manufacture of the bit as a whole and reduce its cost, as well as the cost of its assembly and disassembly.

Claims (2)

1. Wash the drill bit, comprising a housing with a channel and a receptacle in which a nozzle is installed, secured against axial movement by a stopper rod installed in the annular groove of the socket with the possibility of interaction with the lateral surface of the nozzle, so that, in order to reduce its cost, by simplifying the design and manufacturing technology while reducing the cost of assembly and disassembly of the assembly, the outer surface of the nozzle is made in a stepped form, with a step of smaller diameter of the nozzle having the shape of a cone, the top of which is th facing the output part of the washing channel, while the locking rod located in the zone of the coupling stage nozzle, 2. Node for l. 1, from l and h and y and n and so. that, in order to increase the reliability of locking the nozzle, it is provided with a protective annular shield made of an elastic material for a stopper rod, placed between the walls of the socket and the conical surface of the nozzle and secured against axial movement. Fig 2 9 5 Fi2.3