CN203476230U - Shouldered thread connection structure of oil tubes - Google Patents
Shouldered thread connection structure of oil tubes Download PDFInfo
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- CN203476230U CN203476230U CN201320565007.9U CN201320565007U CN203476230U CN 203476230 U CN203476230 U CN 203476230U CN 201320565007 U CN201320565007 U CN 201320565007U CN 203476230 U CN203476230 U CN 203476230U
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- male
- male joint
- connection structure
- stress relief
- relief grooves
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Abstract
The utility model relates to the field of oil drilling tool oil tubes, and discloses a shouldered thread connection structure of oil tubes. The shouldered thread connection structure comprises male connectors and a coupling, the male connectors are provided with axial tapered external threads, the two ends of the coupling are provided with axial tapered internal threads, and the coupling is fixedly connected with the male connectors in the mode that the internal threads and the external threads have the same thread form and the same thread pitch and are parallel. The shouldered thread connection structure is characterized in that the middle portions of the internal threads at the two ends of the coupling are respectively provided with a sawtooth-shaped shoulder, and the upper end and the lower end of each sawtooth-shaped shoulder are additionally provided with a set of stress relief grooves; the middle of the external thread of each male connector is also provided with a male-connector sawtooth-shaped shoulder, the upper end and the lower end of each male-connector sawtooth-shaped shoulder are also provided with a set of male-connector stress relief grooves, the male-connector sawtooth-shaped shoulders are connected with the sawtooth-shaped shoulders in an overlaid mode, and the male-connector stress relief grooves are connected with the stress relief grooves in a matched mode. According to the shouldered thread connection structure, an existing connection structure is improved, the improved structure enhances torsion resistance of the coupling and the male connectors, and service life is prolonged.
Description
Technical field
The utility model relates to the oil pipe field of oil drilling instrument, specifically a kind of shoulder type screw connection structure of oil pipe.
Background technology
At present, the connection that is generally used for oil pipe is male joint of each butt welding and female joint at the two ends of oil pipe, by male joint together with helicitic texture between female joint on adjacent oil pipe is rotatably connected.In actual use, the oil pipe between adjacent needs to be connected with male joint by male joint sometimes, at this moment just need to use box cupling that two male joints are fixed together.Existing tubing coupling structure is generally to comprise a box cupling body, the two ends of box cupling body are with axial conical internal thread, male joint is with axial conical external screw thread, and the termination of box cupling body and the male joint of oil pipe are fixed together with pitch flat pattern engage thread with same tooth form.Although this box cupling structure has solved traditional box cupling stress and has concentrated the problem that easily produces fatigue fracture, but do not improve the torsional property of box cupling, the bonding strength of box cupling is not high yet, connects effect bad yet, and do not improve how many application life of box cupling yet.
Summary of the invention
The purpose of this utility model is to provide a kind of shoulder type screw connection structure of oil pipe, and the male joint of oil pipe and box cupling structure are made to improvement simultaneously, can solve the problem in background technology, improves the torsional property of box cupling and male joint.
In order to solve the problems of the technologies described above adopted technical scheme, be: a kind of shoulder type screw connection structure of oil pipe, comprise male joint and box cupling, male joint is with the external screw thread of axial taper, the two ends of box cupling are with the internal thread of axial taper, box cupling is fixedly connected with pitch flat pattern engage thread with externally threaded same tooth form with internal thread with male joint, it is characterized in that, box cupling two ends with the middle part of internal thread be respectively provided with zigzag shoulder, the upper and lower side of zigzag shoulder is all set up one group of stress relief grooves; Male joint with externally threaded middle part be also provided with male joint zigzag shoulder, the upper and lower side of zigzag shoulder is also equipped with one group of male joint stress relief grooves, male joint zigzag shoulder is connected with zigzag shoulder is overlapping, and male joint stress relief grooves and stress relief grooves are connected.
The utility model makes improvements existing box cupling and male joint structure, concrete is female thread structure that docking band has and male joint with external thread structure make improvements, middle part and externally threaded middle part at internal thread arrange zigzag shoulder, upper and lower side at zigzag shoulder is equipped with one group of stress groove, improved the torsional property of box cupling and male joint, thoroughly solve stress and concentrated the box cupling of generation and the problem of male joint fracture, extend the application life of box cupling and male joint, reduced cost.
Accompanying drawing explanation
Fig. 1, structure chart of the present utility model;
Fig. 2, the amplification assumption diagram of threaded middle in Fig. 1.
The specific embodiment
Below in conjunction with accompanying drawing, concrete structure of the present utility model and concrete embodiment thereof are further described.
As shown in Figure 1, for structure chart of the present utility model, a kind of shoulder type screw connection structure of oil pipe, this syndeton specifically comprises box cupling 1 and male joint 2, the two ends of box cupling 1 are with axial conical internal thread 3, male joint 2 is with axial conical external screw thread 4, box cupling 1 two ends with the middle part of internal thread be respectively provided with zigzag shoulder 5, the upper and lower side of zigzag shoulder 5 is all set up one group of stress relief grooves 6; Male joint 2 with the middle part of external screw thread 4 be also provided with male joint zigzag shoulder 7, the upper and lower side of zigzag shoulder 7 is also equipped with one group of male joint stress relief grooves 8.As shown in Figure 2, zigzag shoulder 5 and stress relief grooves 6 have been set up in internal thread 3 middle parts of box cupling 1, and male joint zigzag shoulder 7 and male joint stress groove 8 have been set up in external screw thread 4 middle parts of male joint 2.
The specific embodiment: in the present embodiment, the connection of oil pipe 10 adopts box cupling 1 to fix two male joints 2.Male joint zigzag shoulder 7 is connected with zigzag shoulder 5 is overlapping, and male joint stress relief grooves 8 is connected with stress relief grooves 6, and box cupling 1 is fixed together with pitch flat pattern engage thread with the same tooth form of male joint 2 with internal thread 3 and external screw thread 4.
The utility model makes improvements the external screw thread 4 of the internal thread 3 of box cupling 1 and male joint 2, zigzag shoulder 5 and male joint zigzag shoulder 7 at the middle part of internal thread 3 and external screw thread 4, have been set up, at the upper and lower side of zigzag shoulder 5, set up one group of stress relief grooves 6, at the upper and lower side of male joint zigzag shoulder 7, set up one group of male joint stress relief grooves 8, structure after improvement has improved the torsional property of box cupling 1 and male joint 2, has extended application life.
Claims (1)
1. the shoulder type screw connection structure of an oil pipe, comprise box cupling (1) and male joint (2), the two ends of box cupling are with the internal thread (3) of axial taper, male joint is with the external screw thread (4) of axial taper, box cupling (1) is fixedly connected with pitch flat pattern engage thread with the same tooth form of male joint (2) with internal thread (3) and external screw thread (4), it is characterized in that: box cupling (1) two ends with the middle part of internal thread (3) be respectively provided with zigzag shoulder (5), the upper and lower side of zigzag shoulder is all set up one group of stress relief grooves (6); Male joint (2) with the middle part of external screw thread (4) be also provided with male joint zigzag shoulder (7), the upper and lower side of zigzag shoulder is also equipped with one group of male joint stress relief grooves (8), male joint zigzag shoulder (7) and overlapping connection of zigzag shoulder (5), male joint stress relief grooves (8) is connected with stress relief grooves (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320565007.9U CN203476230U (en) | 2013-09-12 | 2013-09-12 | Shouldered thread connection structure of oil tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320565007.9U CN203476230U (en) | 2013-09-12 | 2013-09-12 | Shouldered thread connection structure of oil tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203476230U true CN203476230U (en) | 2014-03-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320565007.9U Expired - Fee Related CN203476230U (en) | 2013-09-12 | 2013-09-12 | Shouldered thread connection structure of oil tubes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203476230U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287044A (en) * | 2016-08-16 | 2017-01-04 | 陆金福 | There is the screw connection structure of the band coating steel pipe of corrosion proof function |
-
2013
- 2013-09-12 CN CN201320565007.9U patent/CN203476230U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287044A (en) * | 2016-08-16 | 2017-01-04 | 陆金福 | There is the screw connection structure of the band coating steel pipe of corrosion proof function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20170912 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |