CN203476240U - Oil drill stem female joint with root stress groove threads - Google Patents
Oil drill stem female joint with root stress groove threads Download PDFInfo
- Publication number
- CN203476240U CN203476240U CN201320565281.6U CN201320565281U CN203476240U CN 203476240 U CN203476240 U CN 203476240U CN 201320565281 U CN201320565281 U CN 201320565281U CN 203476240 U CN203476240 U CN 203476240U
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- China
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- female joint
- drill stem
- pressure
- oil drill
- side flank
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Abstract
The utility model relates to a drill stem female joint used for oil drilling, and discloses an oil drill stem female joint with root stress groove threads. The oil drill stem female joint comprises a female joint body and internal threads, wherein the internal threads are divided into a non pressure-bearing side tooth flank, a large transition arc and a pressure-bearing side tooth flank. The oil drill stem female joint is characterized in that a perpendicular face perpendicular to the middle diameter is arranged on the pressure-bearing side tooth flank, the large transition arc is an inscribed circle of the non pressure-bearing side tooth flank and the perpendicular face, and the non pressure-bearing side tooth flank, the large transition arc and the perpendicular face define a root stress groove. The structure of internal threads of an existing oil drill stem female joint is improved to form the oil drill stem female joint. According to the improved oil drill stem female joint, the perpendicular face and the root stress groove are additionally arranged, and therefore stress is evenly distributed, the service life of the female joint is prolonged, and the strength of the female joint is improved.
Description
Technical field
The utility model relates to the screw thread of oil drill rocker female joint, specifically a kind of oil drill rocker female joint of bottom stress groove screw thread with tooth.
Background technology
At present, joint of petroleum drill rod is divided into male joint and female joint, male joint and female joint with screw thread identical, it is tight that male joint and female joint screw rear connection.But because screw thread is subject to the deformation that stress produces, identical helicitic texture easily causes stress to concentrate in female joint ridge bottom, makes female joint thread damage, causes greater loss.
As shown in Figure 2, be the structure chart of existing female joint, the screw thread of existing female joint is divided into three parts, is respectively non-pressure side flank, transition arc and pressure-bearing side flank, and excessively circular arc is the inscribed circle of non-pressure side flank and pressure-bearing side flank.The threaded top of female joint the same side and the center line of the bottom of thread are called " central diameter ", and general pressure-bearing side flank departs from the vertical plane of central diameter, and transition arc radius is too small.Due to female joint and male joint with screw thread all there is such structure, caused screwing rear stress concentrations at the bottom of tooth, thereby damaged screw thread.
Summary of the invention
The purpose of this utility model is to provide a kind of oil drill rocker female joint with tooth bottom stress groove screw thread, can solve existing female joint stress concentrations in the problem of the bottom of thread, improves torsional property.
In order to solve the problems of the technologies described above adopted technical scheme, be: a kind of oil drill rocker female joint with tooth bottom stress groove screw thread, comprise female joint main body and internal thread, internal thread is divided into non-pressure side flank, great transition circular arc and pressure-bearing side flank totally three parts, it is characterized in that, at pressure-bearing side flank place, be provided with a vertical plane vertical with central diameter, described great transition circular arc is the inscribed circle of non-pressure side flank and vertical plane, and non-pressure side flank, great transition circular arc and vertical plane surround and form tooth bottom stress groove.
The utility model to existing female joint with the structure of internal thread improve, at original pressure-bearing side flank, set up vertical plane, original transition arc is improved to great transition circular arc, and at great transition circular arc place formation tooth bottom stress groove, female joint structure and existing female joint after improvement are used interchangeably, while being connected with male joint, make original concentrate be distributed in thread root stress equilibrium be distributed on pressure-bearing side flank, the working strength that has improved female joint, has extended application life.
Accompanying drawing explanation
Fig. 1, structure chart of the present utility model;
Fig. 2, existing female joint structure chart.
The specific embodiment
Below in conjunction with accompanying drawing 1 and Fig. 2, the specific embodiment of the present utility model is described in detail.
As shown in Figure 1, it is structure chart of the present utility model, a kind of oil drill rocker female joint with tooth bottom stress groove screw thread, comprise female joint main body 1, internal thread 2, internal thread 2 is specifically comprised of non-pressure side flank 3, great transition circular arc 4 and pressure-bearing side flank 5 three parts, at pressure-bearing side flank 5 places, be provided with a vertical plane 7 vertical with central diameter 6, described great transition circular arc 4 is inscribed circles of non-pressure side flank 3 and vertical plane 7, and non-pressure side flank 3, great transition circular arc 4 and vertical plane 7 surround and form tooth bottom stress groove 8.In conjunction with Fig. 2, great transition circular arc 4 of the present utility model is larger than the transition arc of existing female joint 9.
The specific embodiment: the female joint that is originally utility model is screwed and is connected with male joint of the prior art, internal thread 2 by female joint screws with the external screw thread of male joint, the non-pressure side flank of the non-pressure side flank 3 corresponding male joints at internal thread 2 places of female joint, the transition arc of its great transition circular arc 4 corresponding male joints place, the pressure-bearing side flank place of its pressure-bearing side flank 5 corresponding male joints.Because great transition circular arc 4 of the present utility model is larger than the arc transition of male joint, and the circular arc that to be vertical plane by setting up 7 form with the tangent inscribed circle of non-pressure side flank 3, and surround and formed tooth bottom stress groove 8 at non-pressure side flank 3, great transition circular arc 4 and vertical plane 7, when female joint and male joint screw, the original stress equilibrium that is distributed in female joint and male joint root of concentrating very is greatly distributed on pressure-bearing side flank 5, the working strength that has improved female joint, has extended application life.
Claims (1)
1. the oil drill rocker female joint with tooth bottom stress groove screw thread, comprise female joint main body (1) and internal thread (2), internal thread (2) is divided into non-pressure side flank (3), great transition circular arc (4) and pressure-bearing side flank (5) totally three parts, it is characterized in that: pressure-bearing side flank (5) locates to be provided with a vertical plane (7) vertical with central diameter (6), described great transition circular arc (4) is the inscribed circle of non-pressure side flank (3) and vertical plane (7), and non-pressure side flank, great transition circular arc and vertical plane surround and form tooth bottom stress groove (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320565281.6U CN203476240U (en) | 2013-09-12 | 2013-09-12 | Oil drill stem female joint with root stress groove threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320565281.6U CN203476240U (en) | 2013-09-12 | 2013-09-12 | Oil drill stem female joint with root stress groove threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203476240U true CN203476240U (en) | 2014-03-12 |
Family
ID=50224587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320565281.6U Expired - Fee Related CN203476240U (en) | 2013-09-12 | 2013-09-12 | Oil drill stem female joint with root stress groove threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203476240U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016147222A1 (en) * | 2015-03-18 | 2016-09-22 | Nkktubes | Drill pipe with double shoulder tool joints |
| CN109958698A (en) * | 2019-04-28 | 2019-07-02 | 中船重工海为郑州高科技有限公司 | A kind of high intensity circular thread auxiliary connection |
-
2013
- 2013-09-12 CN CN201320565281.6U patent/CN203476240U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016147222A1 (en) * | 2015-03-18 | 2016-09-22 | Nkktubes | Drill pipe with double shoulder tool joints |
| JP2018509573A (en) * | 2015-03-18 | 2018-04-05 | エヌケーケーシームレス鋼管株式会社 | Drilling steel pipe with double shoulder tool joint |
| CN109958698A (en) * | 2019-04-28 | 2019-07-02 | 中船重工海为郑州高科技有限公司 | A kind of high intensity circular thread auxiliary connection |
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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 |