CN214616398U

CN214616398U - Cross joint

Info

Publication number: CN214616398U
Application number: CN202120068267.XU
Authority: CN
Inventors: 徐浩
Original assignee: Shenhua Shendong Coal Group Co Ltd
Current assignee: Shenhua Shendong Coal Group Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-11-05
Anticipated expiration: 2031-01-13

Abstract

The application provides a crossover joint, which comprises a cylindrical joint body; the sealing sleeve is detachably sleeved on the outer wall of the joint body, and the outer wall surface of the sealing sleeve radially protrudes out of the outer wall surface of the joint body; the first channel is arranged on the joint body and used for conveying fluid to the inner cavity at the lower end of the joint body; the second channel is arranged on the connector body and used for upwards conveying rock debris, the second channel is not communicated with the first channel, the cross connector can be matched with a double-wall drilling tool to forcibly change the forward circulation drilling into the reverse circulation drilling, and meanwhile, the sealing sleeve is detachably connected, so that the change is convenient when the sealing sleeve is seriously abraded.

Description

Cross joint

Technical Field

The utility model belongs to the technical field of the drilling machine, concretely relates to cross connection.

Background

At present, in the air drilling construction process, the forward circulation drilling part needs to be forcibly changed into a reverse circulation effect under partial conditions, namely, the forward circulation drilling and the reverse circulation deslagging are adopted.

During construction, a reverse circulation double-wall drilling tool and a cross joint are connected in a manner of matching with a positive circulation impactor or a drill bit. Therefore, the cross joint is required to be capable of sealing the hole wall or the inner wall of the sleeve, the forward circulation drilling at the lower part of the cross joint is forced to enter the inner pipe of the double-wall drill rod through the cross joint during slag discharge, and finally the hole is discharged from the central pipe, so that the reverse circulation process is realized.

SUMMERY OF THE UTILITY MODEL

To the part or whole of above-mentioned technical problem that exists among the prior art, the utility model provides a cross joint. The cross joint can cooperate with a double-wall drilling tool to forcibly change the forward circulation drilling into the reverse circulation drilling. Meanwhile, the sealing sleeve is detachably connected, so that the sealing sleeve is convenient to replace when the sealing sleeve is seriously abraded.

According to the utility model discloses, a cross connection is provided, include:

a cylindrical joint body,

a sealing sleeve detachably sleeved on the outer wall of the joint body, the outer wall surface of the sealing sleeve radially protrudes out of the outer wall surface of the joint body,

a first channel arranged on the joint body and used for conveying fluid to the inner cavity at the lower end of the joint body,

a second passage provided on the joint body for conveying rock debris upward, the second passage being configured to be not communicated with the first passage.

In one embodiment, the sealing sleeve is axially clamped on a mounting groove formed in the joint body and connected with the joint body in a key connection mode.

In one embodiment, the joint body comprises an upper joint and a lower joint partially sleeved on the outer wall of the lower end of the upper joint, a first downward step surface is arranged on the outer wall of the upper joint to form the mounting groove with the upper end surface of the lower joint, and the sealing sleeve is connected with the upper joint through a key.

In one embodiment, an inner pipe is sleeved in the inner cavity of the joint body at intervals, a blocking plate for blocking the inner cavity of the inner pipe is arranged at the lower end of the inner pipe, the first channel is formed by an annular space between the inner pipe and the joint body, the second channel is formed by the inner cavity of the inner pipe and a connecting channel which penetrates through the joint body in a sealing mode, and the connecting channel is located at the lower end of the sealing sleeve.

In one embodiment, a first hole is provided on a wall of the joint body, a second hole radially opposite to the first hole is provided on a wall of the inner pipe, and a welding bar is provided between the joint body and the inner pipe on outer circumferential sides of the first hole and the second hole to form the connection passage between the first hole and the second hole.

In one embodiment, a plurality of circumferentially spaced support blocks are provided between the fitting body and the inner tube.

In one embodiment, the support block is welded to both the fitting body and the inner tube.

In one embodiment, an upward second step surface is arranged on the inner wall of the joint body, and positioning blocks at intervals in the circumferential direction are arranged on the second step surface and are arranged opposite to the lower end surface of the inner pipe.

In one embodiment, a plurality of sealing sleeves of varying radial thickness are included for selective coupling with the fitting body.

In one embodiment, the upper fitting is threadably connected to the lower fitting.

Compared with the prior art, the utility model has the advantages of: the cross joint can be matched with a double-wall drilling tool to forcibly change the forward circulation drilling into the reverse circulation drilling. And the sealing sleeve is detachably connected, so that the sealing sleeve is convenient to replace when the sealing sleeve is seriously abraded, and the construction cost is reduced.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

fig. 1 shows a cross joint according to an embodiment of the invention;

FIG. 2 is section B-B from FIG. 1;

FIG. 3 is section C-C from FIG. 1.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

In order to make the technical solutions and advantages of the present invention more clearly understood, the following description is made in further detail with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

An embodiment of the utility model provides a cross joint. As shown in fig. 1, the cross-over fitting includes a fitting body, a gland 1, a first passage and a second flow passage. Wherein, the joint body is cylindrical, the upper end is used for connecting a double-wall drilling tool, and the lower end is used for connecting a positive circulation impactor or a drill bit. The sealing sleeve 1 is arranged on the outer wall of the joint body. Meanwhile, the outer wall surface of the sealing sleeve 1 radially protrudes out of the outer wall surface of the joint body so as to play a role in sealing the hole wall or the inner wall of the sleeve in the drilling process. Preferably, the sealing sleeve 1 and the joint body are configured to be detachably connected so as to facilitate timely replacement after the sealing sleeve 1 is worn, thereby reducing construction costs. The first channel is arranged on the joint body and used for conveying fluid to the inner cavity at the lower end of the joint body so as to ensure the positive circulation drilling of the drill bit or the impactor. The second passageway sets up on connecting the body for with the external world intercommunication of drill bit or impacter department to upwards carry the detritus, thereby accomplish the sediment operation.

Specifically, an annular mounting groove 2 is provided on the outer wall of the joint body. The sealing sleeve 1 is sleeved in the mounting groove 2 and is axially clamped on the wall of the mounting groove 2. Meanwhile, the sealing sleeve 1 is connected with the joint body through a key 3. The 3 connection modes of this kind of key can guarantee that seal cover 1 and joint body rotate together, guarantee the stability and the validity of revolving force transmission. Meanwhile, the connecting mode is simple and easy to detach.

More specifically, the joint body includes an upper joint 4 and a lower joint 5 which are axially connected in series. For example, the upper joint 4 is cylindrical. The lower joint 5 is also cylindrical. The lower end of the upper joint 4 is inserted into the inner cavity of the upper end of the lower joint 5, and the two are partially sleeved. For example, the upper joint 4 and the lower joint 5 may be connected by a screw connection. The split type connecting mode has a simple structure, and is beneficial to processing of each part and assembling and disassembling of different parts. A first step surface 41 is provided on the outer wall of the upper joint 4 facing downward. The first step surface 41 and the upper end surface of the lower joint 5 form a mounting groove 2 therebetween. Meanwhile, the sealing sleeve 1 is clamped with the upper joint 4 through a key 3. After the sealing sleeve 1 is worn, the upper joint 4 and the lower joint 5 are disassembled firstly, and then the sealing sleeve 1 is taken down from the upper joint 4. Thereafter, a new gland 1, as well as upper and

lower fittings

4, 5, are installed ready for re-drilling. This connection makes it very easy to replace the gland 1, which is a wear-prone part, and thus contributes to an increase in production efficiency.

Preferably, the sealing sleeve 1 may be plural. And the radial thickness may differ between the sealing sleeves 1. In the use process, according to the geological conditions of the stratum or the size of a drill bit, the adaptive sealing sleeve 1 can be selected and used for ensuring good sealing between the sealing sleeve 1 and a casing or a hole wall.

In one embodiment, the inner tube 6 is spacedly sleeved in the inner cavity of the joint body. The lower end of the inner tube 6 is provided with a blocking plate 7 for blocking the inner cavity of the inner tube 6. The annulus between the inner tube 6 and the joint body forms a first passage. During operation, fluid flows down through the annulus between the inner tube 6 and the sub body and into the lower end cavity of the sub body, where it is then used to drive the drill bit or impactor into operation. While the inner cavity of the inner tube 6 forms a second channel with a connecting channel 8 passing sealingly through the joint body. During drilling, the rock debris enters the inner cavity of the inner tube 6 through the connecting passage 8 and flows back upwards.

Specifically, as shown in fig. 3, a first hole 51 is provided in the wall of the joint body. The first hole 51 may be provided in the wall of the lower joint 5. Meanwhile, a second hole 61 is provided on the wall of the inner tube 6. The second hole 61 is diametrically opposed to the first hole 51. Meanwhile, a welding bar is provided between the joint body located on the outer peripheral side of the first hole 51 and the second hole 61 and the inner pipe 6 to form the connection passage 8 between the first hole 51 and the second hole 61. The arrangement cuts off the communication between the first hole 51 and the second hole 61 and the annulus, so that the first passage is not communicated with the second passage. In addition, by the above arrangement, the inner pipe 6 can be fixed to the lower joint 5, and the inner pipe 6 can be fixed.

As shown in fig. 2, a support block 9 is provided between the inner pipe 6 and the upper joint 4 for supporting the upper end of the inner pipe 6 to ensure that the inner pipe 6 is substantially centered. For example, in the circumferential direction, a plurality of uniformly distributed supporting blocks 9 are provided, and the adjacent supporting blocks 9 are distributed at intervals. In addition, the support block 9 may be connected to the inner pipe 6 and the upper joint 4, respectively, by welding. This arrangement not only allows the radial position of the inner tube 6 to be defined relative to the upper joint 4, but also the axial position of the inner tube 6 relative to the upper joint 4.

An upwardly facing second step surface 52 is provided on the inner wall of the fitting body. The second step surface 52 is provided on the inner wall of the lower joint 5. Meanwhile, positioning blocks (not shown) are provided on the second step surface 52 at intervals in the circumferential direction. In the installation process, the lower end face of the inner pipe 6 can be abutted against the positioning block. On the one hand, the inner tube 6 can be positioned during the assembly process by means of positioning blocks. On the other hand, the positioning block can ensure that the blocking plate 7 can not be seated on the second step surface 52 in a blocking manner, and the first channel is ensured to be completely unblocked.

In addition, an internal thread for connecting a double-walled drilling tool is provided in the upper end inner cavity of the upper joint 4. An external thread for connecting a double-walled drilling tool is provided on the outer wall of the upper end of the inner pipe 6. While in the inner cavity of the lower joint 5 an inner thread is provided for connection of an impactor or drill bit. The above arrangement facilitates the connection.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.

Claims

1. A crossover joint, comprising:

a cylindrical joint body,

2. The crossover joint as defined in claim 1, wherein the sealing boot is axially snap-fitted into a mounting groove formed in the joint body and is connected to the joint body by a key connection.

3. The crossover joint according to claim 2, wherein the joint body comprises an upper joint and a lower joint partially sleeved on an outer wall of a lower end of the upper joint, a first step surface facing downward is provided on an outer wall of the upper joint to form the mounting groove with an upper end surface of the lower joint, and wherein the sealing sleeve is connected with the upper joint through a key.

4. The crossover joint according to claim 1, wherein an inner tube is fitted in the inner cavity of the joint body at an interval, a blocking plate for blocking the inner cavity of the inner tube is provided at a lower end of the inner tube, an annulus between the inner tube and the joint body forms the first passage, the inner cavity of the inner tube forms the second passage with a connecting passage sealingly penetrating the joint body, and the connecting passage is located at a lower end of the sealing sleeve.

5. The crossover joint according to claim 4, wherein a first hole is provided on a wall of the joint body, a second hole radially opposite to the first hole is provided on a wall of the inner pipe, and a welding bar is provided between the joint body and the inner pipe on outer circumferential sides of the first hole and the second hole to form the connection passage between the first hole and the second hole.

6. The crossover joint of claim 4, wherein a plurality of circumferentially spaced support blocks are provided between the joint body and the upper end of the inner tube.

7. The crossover joint of claim 6, wherein the support block is welded to both the joint body and the inner tube.

8. The crossover joint according to claim 4, wherein a second step surface is provided on an inner wall of the joint body, which faces upward, and circumferentially spaced positioning blocks are provided on the second step surface so as to be arranged opposite to a lower end surface of the inner pipe.

9. The crossover joint of any one of claims 1 to 8, comprising a plurality of sealing boots of varying radial thickness to selectively couple with the joint body.

10. The crossover connection as defined in claim 3, wherein the upper connection is threaded with the lower connection.