CN117905396A - Pipe fitting taper threaded connection structure and pipe fitting - Google Patents
Pipe fitting taper threaded connection structure and pipe fitting Download PDFInfo
- Publication number
- CN117905396A CN117905396A CN202410136359.5A CN202410136359A CN117905396A CN 117905396 A CN117905396 A CN 117905396A CN 202410136359 A CN202410136359 A CN 202410136359A CN 117905396 A CN117905396 A CN 117905396A
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- coupling
- pipe
- factory
- pipe body
- shoulder
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- 230000008878 coupling Effects 0.000 claims abstract description 101
- 238000010168 coupling process Methods 0.000 claims abstract description 101
- 238000005859 coupling reaction Methods 0.000 claims abstract description 101
- 230000004323 axial length Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Abstract
The invention belongs to the field of taper threaded connection of pipe fittings, and particularly relates to a taper threaded connection structure of a pipe fitting and a pipe fitting. The coupling factory end is provided with a limiting shoulder, the pipe body factory end is also provided with a limiting shoulder matched with the limiting shoulder, and when the coupling factory end is in threaded connection with the pipe body factory end, the limiting shoulder fixes the assembly positions of the coupling factory end and the pipe body factory end. The field end of the coupling and the field end of the pipe body thread are not provided with limiting shoulders. The inner thread of the factory end of the coupling and the outer thread of the factory end of the pipe body are left-handed, and the inner thread of the field end of the coupling and the outer thread of the field end of the pipe body are right-handed. The pipe bodies on two sides of the coupling adopt a butt-type threaded connection mode, and the connection structure can effectively ensure the contact stress between the threaded end surfaces of two pipe bodies when the threaded connection is completed in the coupling, so that the connection strength and high sealing pressure of the threaded connection of the pipe fitting are ensured.
Description
Technical Field
The invention belongs to the field of taper threaded connection of pipe fittings, and particularly relates to a taper threaded connection structure of a pipe fitting and a pipe fitting.
Background
Taper threaded connection technology is increasingly applied to pipe fittings used in the process of energy exploration and development of petroleum, natural gas, coal bed gas and the like, for example, an oil casing is connected into a pipe string by taper threads so as to stabilize the wall of a well and form an oil-gas channel; the drill rod is connected into a tubular column through taper threads, the drill bit is sent to the bottom of the well, and a circulation channel of drilling fluid is provided. Meanwhile, the corrosion problem between the pipe body and the coupling at the threaded connection part of the pipe fitting is more and more prominent along with the increase of the harsher and the service time of the corrosion medium in the operation environment, on one hand, the pipe body and the coupling are often made of different metal materials, potential difference corrosion exists between the pipe body and the coupling, and on the other hand, a gap exists between the external thread surface of the pipe body end and the internal thread surface of the coupling, so that crevice corrosion is generated. Therefore, the connection mode that the same kind of material is formed between the pipe bodies in the coupling by adopting opposite-top type threaded connection, and the prevention of potential difference corrosion and crevice corrosion between the pipe bodies and the coupling is one of the technical means for effectively solving the corrosion resistance and integrity problems of the whole pipeline. However, how to ensure that the threaded ends of the outer threads of the pipe body at the two ends of the coupling are in a good contact state after the threaded connection is made up is a technical problem that has been sought to be solved, and it is highly desirable to provide a pipe taper threaded connection structure that overcomes the shortcomings of the prior art, so as to solve or alleviate one or more of the above-mentioned problems.
Disclosure of Invention
The invention provides a pipe fitting taper threaded connection structure and a pipe fitting, which are used for solving the problem that the threaded connection cannot ensure that the threaded ends of the outer threads of the pipe body at the two ends of a coupling are in a good contact state after the threaded connection is completed.
In order to achieve the above purpose, the invention proposes the following technical scheme:
a taper threaded connection structure of a pipe fitting comprises a coupling, a pipe embodying field end and a pipe body factory end;
The pipe factory end and the pipe field end are connected through a coupling;
one end of the coupling is a coupling factory end, and is provided with a coupling factory end internal thread and a coupling factory end limiting shoulder; the other end of the coupling is a coupling field end provided with a coupling field end internal thread;
The pipe factory end is provided with a pipe factory end external thread and a pipe factory end limiting shoulder which are matched with the coupling factory end; the pipe body field end is provided with a pipe body field end external thread matched with the coupling field end;
the coupling factory end internal thread is connected with the pipe body factory end external thread, and the coupling field end internal thread is connected with the pipe body reflecting field end external thread; the coupling factory end limiting shoulder is connected with the pipe factory end limiting shoulder;
The state of the pipe body factory end and the pipe body field end of the threaded connection structure after being connected in the coupling is that the end faces and contacts with each other.
Preferably, the factory end of the coupling is further provided with a boring section, and the limit shoulder of the factory end of the coupling is positioned between the boring section of the end face and the internal thread of the factory end of the coupling.
Preferably, the internal thread of the factory end of the coupling is a left-handed thread, and the internal thread of the field end of the coupling is a right-handed thread;
The external thread of the factory end of the pipe body is a left-handed thread, and the external thread of the field end of the pipe body is a right-handed thread.
Preferably, the end face of the pipe body factory end is provided with a pipe body factory end torque bearing shoulder, and the end face of the pipe body field end is provided with a pipe embodying field end torque bearing shoulder;
The factory end torque bearing shoulder of the pipe body is connected with the field end torque bearing shoulder of the pipe body.
Preferably, the tube factory end torque-carrying shoulder is located at the axial length centerline of the coupling.
Preferably, the radial width of the factory end load torque shoulder of the pipe body and the field end load torque shoulder of the pipe is larger than 2mm
Preferably, the contact stress between the factory end torque bearing shoulder surface of the pipe body and the field end torque bearing shoulder surface of the pipe body is more than 100MP.
Preferably, the radial width of the factory end limiting shoulder of the coupling is greater than or equal to 1.5mm.
Preferably, the radial width of the limit shoulder at the factory end of the pipe body is more than or equal to 1.5mm
A pipe fitting adopts the pipe fitting taper threaded connection structure.
The invention has the advantages that:
The invention provides a pipe fitting taper threaded connection structure, which is characterized in that a pair of relatively matched limit shoulders are arranged at a pipe body factory end and a coupling factory end, the position of an external threaded end face of the pipe body factory end in a coupling and the screwing torque are accurately controlled, further, a left-handed taper thread is adopted at the coupling factory end, and a right-handed taper thread is adopted at a field end, so that when the pipe fitting is in threaded connection assembly on an operation field, when the factory end threaded end face of the pipe body and the field end threaded end face are in contact collision, friction force of a bearing torque shoulder face generated by field torsion is in a fastening effect relative to threaded connection on two sides.
The invention effectively ensures the contact stress between the two pipe body end surfaces in the coupling and the torque bearing shoulder surface by quickly raising the contact stress of the torque bearing shoulder surface, and effectively solves the problems of connection strength and sealing performance of the tapered threaded connection of the opposite-type pipe fitting after the threading and corrosion resistance in the threaded connection.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a tapered threaded connection for a pipe according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a coupling structure provided in accordance with one embodiment of the present invention;
FIG. 3 is a schematic view of a plant end structure of a pipe according to one embodiment of the present invention.
In the figure, 1 is a coupling, 2 is a pipe embodiment field end, 3 is a pipe body factory end, 1-1 is a coupling factory end, 1-2 is a coupling field end, 1-3 is a coupling factory end internal thread, 1-4 is a coupling field end internal thread, 1-5 is a coupling factory end boring section, 1-6 is a coupling factory end limiting shoulder, 2-1 is a pipe body factory end limiting shoulder, 2-2 is a pipe body factory end external thread, 2-3 is a pipe body factory end bearing torque shoulder, 2-4 is a pipe body factory end withdrawal cylindrical section, 3-1 is a pipe body field end external thread, and 3-2 is a pipe embodiment field end bearing torque shoulder.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Referring to fig. 1, the invention provides a taper threaded connection structure of a pipe, which is composed of a pipe body with external threads on two sides and a coupling with internal threads on two ends, wherein the pipe bodies are connected in a butt joint mode in the coupling, and specifically, the taper threaded connection structure comprises a coupling 1, a pipe representing field end 2 and a pipe representing field end 3, wherein the two sides in the coupling 1 are respectively provided with the pipe representing field end 2 and the pipe representing field end 3.
The coupling 1 is of a non-bilateral symmetry structure, two ends are a coupling factory end 1-1 and a coupling field end 1-2 respectively, the coupling factory end 1-1 is provided with a coupling factory end internal thread 1-3 and a coupling factory end limiting shoulder 1-6, and the coupling field end 1-2 is only provided with a coupling field end internal thread 1-4.
The factory end 1-1 of the coupling is also provided with a boring section 1-5, and the limit shoulder 1-6 of the factory end of the coupling is positioned between the boring section 1-5 of the end face and the internal thread 1-3, as shown in figure 2.
The pipe factory end 2 is provided with a pipe factory end external thread 2-2 matched with the coupling factory end 1-1 and a pipe factory end limiting shoulder 2-1; the pipe body field end 3 is provided with a right-handed taper external thread 3-1 matched with the coupling field end.
The end face of the pipe body factory end 2 is provided with a pipe body factory end torque bearing shoulder 2-3, and the end face of the pipe body field end 3 is provided with a pipe body field end torque bearing shoulder 3-2.
The pipe body factory end limiting shoulder 2-1 is positioned on a substrate close to the large end of the external thread 2-2 of the pipe body factory end, and a tool withdrawal cylindrical section 2-4 is arranged between the pipe body factory end limiting shoulder 2-1 and the large end of the external thread 2-2, as shown in figure 3.
The coupling factory end internal thread 1-3 is connected and assembled with the pipe body factory end external thread 2-2, and the coupling field end internal thread 1-4 is connected and assembled with the pipe body field end external thread 3-1.
When the internal thread 1-3 of the coupling factory end is connected and assembled with the external thread 2-2 of the pipe body factory end, collision signals between the limiting shoulders 1-6 of the coupling factory end and the limiting shoulders 2-1 of the pipe body factory end appear and reach a preset make-up torque value, and at the moment, the quality of threaded connection make-up is judged to be qualified.
When the internal thread 1-4 of the coupling field end is connected and assembled with the external thread 3-1 of the pipe body field end, collision signals between the bearing torque shoulder 2-3 of the pipe body factory end and the bearing torque shoulder 3-2 of the pipe body field end appear and reach a preset make-up torque value, and at the moment, the quality of the threaded connection make-up is judged to be qualified.
In one embodiment, the radial width of the coupling factory end stop shoulders 1-6 is 1.5mm or more, such as 2mm.
In one embodiment, the radial width of the pipe body factory end load torque shoulder 2-3 and the field end load torque shoulder 3-2 is 2.5mm.
In a specific embodiment, the radial width of the pipe body factory end limiting shoulder 2-1 is greater than or equal to 1.5mm.
In a specific embodiment, the axial length of the relief cylinder section 2-4 is 2-5mm, for example 3mm.
In one embodiment, the radial width of the tube body factory end load torque shoulder 2-3 and the tube body field end load torque shoulder 3-2 is greater than 2mm.
In one embodiment, after the pipe body containing the pipe body factory end 2 and the pipe body containing the pipe body embodying the field end 3 are in threaded connection in the coupling 1, the contact stress between the torque bearing shoulder surface 2-3 of the pipe body factory end and the torque bearing shoulder surface 3-2 of the pipe body field end is greater than 100MP.
In one embodiment, the pipe mill end external threads 2-2 are connected with the coupling mill end internal threads 1-3, and the pipe mill end torque bearing shoulder 2-3 is located at the axial length centerline of the coupling 1.
The invention also provides a pipe fitting, which adopts the taper threaded connection structure of the pipe fitting.
The pipe taper threaded connection structure provided by the invention is suitable for pipes made of pure carbon steel, pure corrosion-resistant alloy and metallurgical/mechanical composite bimetallic pipes.
According to the invention, a pair of relatively matched limiting shoulders are arranged at the pipe factory end 3 and the coupling factory end 1-1, so that the position and the screwing torque of the end face of the external thread 2-2 of the pipe factory end in the coupling 1 are accurately controlled, and meanwhile, the special mode of right-handed taper threads is adopted at the coupling field end 1-2 by the coupling factory end 1-1, so that when the threaded connection assembly of pipes is carried out on an operation site, when the threaded end face of the pipe factory end 3 and the threaded end face of the pipe embodying field end 2 are in contact collision, the friction force of the bearing torque shoulder faces generated by the field torsion is in a fastening effect relative to the threaded connection on two sides, so that the contact stress of the bearing torque shoulder faces is rapidly increased, the contact stress between the bearing torque shoulder faces of the two pipe end faces in the coupling 1 is effectively ensured, the connection strength and the sealing performance of the tapered threaded connection of the opposite-type pipe fitting after screwing and the corrosion resistance problem in the threaded connection are effectively solved.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The pipe fitting taper threaded connection structure is characterized by comprising a coupling, a pipe embodying field end and a pipe body factory end;
The pipe factory end and the pipe field end are connected through a coupling;
one end of the coupling is a coupling factory end, and is provided with a coupling factory end internal thread and a coupling factory end limiting shoulder; the other end of the coupling is a coupling field end provided with a coupling field end internal thread;
The pipe factory end is provided with a pipe factory end external thread and a pipe factory end limiting shoulder which are matched with the coupling factory end; the pipe body field end is provided with a pipe body field end external thread matched with the coupling field end;
the coupling factory end internal thread is connected with the pipe body factory end external thread, and the coupling field end internal thread is connected with the pipe body reflecting field end external thread; the coupling factory end limiting shoulder is connected with the pipe factory end limiting shoulder;
the factory end of the pipe body and the field end of the pipe body of the threaded connection structure are in end-to-top contact after being connected in a threaded manner in the coupling.
2. A tubular taper thread connection as recited in claim 1, wherein the coupling factory end further comprises a bore section, and wherein the coupling factory end stop shoulder is located between the end face bore section and the coupling factory end internal thread.
3. The pipe fitting taper thread connection structure according to claim 1, wherein the coupling factory end internal thread is a left-handed thread, and the coupling field end internal thread is a right-handed thread;
The external thread of the factory end of the pipe body is a left-handed thread, and the external thread of the field end of the pipe body is a right-handed thread.
4. The pipe fitting taper threaded connection structure according to claim 1, wherein a pipe body factory end torque bearing shoulder is arranged on an end face of the pipe body factory end, and a pipe embodying field end torque bearing shoulder is arranged on an end face of the pipe body field end;
The factory end torque bearing shoulder of the pipe body is connected with the field end torque bearing shoulder of the pipe body.
5. A tubular tapered threaded connection as claimed in claim 4, wherein the factory end torque-carrying shoulder is located at the axial length centerline of the coupling.
6. A tubular taper thread connection as claimed in claim 4, wherein the radial width of the factory end load torque shoulder of the tubular body and the field end load torque shoulder of the tubular body is greater than 2mm.
7. The tapered threaded connection of a pipe fitting as claimed in claim 4, wherein the contact stress between the factory end torque-carrying shoulder surface of the pipe body and the field end torque-carrying shoulder surface of the pipe body is greater than 100MP.
8. A pipe taper threaded connection as defined in claim 1, wherein the radial width of the collar factory end stop shoulder is 1.5mm or more.
9. A pipe taper threaded connection as defined in claim 1, wherein the radial width of the pipe factory end limit shoulder is 1.5mm or more.
10. A pipe fitting, characterized in that the pipe fitting adopts a pipe fitting taper threaded connection structure as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410136359.5A CN117905396A (en) | 2024-01-31 | 2024-01-31 | Pipe fitting taper threaded connection structure and pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410136359.5A CN117905396A (en) | 2024-01-31 | 2024-01-31 | Pipe fitting taper threaded connection structure and pipe fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117905396A true CN117905396A (en) | 2024-04-19 |
Family
ID=90685957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410136359.5A Pending CN117905396A (en) | 2024-01-31 | 2024-01-31 | Pipe fitting taper threaded connection structure and pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117905396A (en) |
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2024
- 2024-01-31 CN CN202410136359.5A patent/CN117905396A/en active Pending
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