阅读说明：本技术 抗疲劳套管的螺纹接头 (The nipple of antifatigue casing ) 是由 胡志立 李小兵 谢凯意 吴丹 张垂贵 李建亮 付强 李健 冉雪辉 胡新太 刘功威 于 2019-09-27 设计创作，主要内容包括：本发明提供了一种抗疲劳套管的螺纹接头,用于管道的连接,包括：公端,公端上设置有外螺纹接头；母端,母端上设置有内螺纹接头,公端和母端螺纹连接；其中,母端上设置有至少一个应力释放结构,以增加螺纹接头的疲劳强度。本发明的技术方案有效地解决了现有技术中的套管螺纹接头抗疲劳性能的问题。(The present invention provides a kind of nipples of antifatigue casing, the connection for pipeline, comprising: male end is provided with male connection in male end；Female end, female adapter is provided in female end, and male end and female end is threadedly coupled；Wherein, at least one strain relief is provided in female end, to increase the fatigue strength of nipple.Technical solution of the present invention efficiently solves the problems, such as casing thread connection anti-fatigue performance in the prior art.)

1. a kind of nipple of antifatigue casing, the connection for pipeline characterized by comprising

Male end (10) is provided with male connection on the male end (10)；

Female end (20), female adapter is provided on the female end (20), and the male end (10) and the female end (20) screw thread connect It connects；

Wherein, it is provided at least one strain relief (40) on the female end (20), to increase the tired of the nipple Labor intensity.

2. the nipple of antifatigue casing according to claim 1, which is characterized in that the male end (10) and the mother Multiple connection structures are formed after the cooperation of end (20), multiple connection structures include:

Outer seal configuration (30), the outer seal configuration (30) are positioned close to the end position of the female end (20)；

Strain relief (40), strain relief (40) setting is in the outer seal configuration (30) close to the female end (20) side of end；

The strain relief (40) is arranged far from described outer close in thread engaging structure (50), the thread engaging structure (50) The side of seal structure (30)；

Inner seal structure (70), inner seal structure (70) setting is in the thread engaging structure (50) far from the external seal The side of structure (30)；

Shoulder structure (80), shoulder structure (80) setting is in the inner seal structure (70) far from the outer seal configuration (30) side, and it is in the end position of the male end (10).

3. the nipple of antifatigue casing according to claim 2, which is characterized in that the male end (10) includes:

The big end of tube body (11), the big end of tube body (11) are arranged far from the position of the end of the male end (10)；

External thread part (12), external thread part (12) setting is in the big end of the tube body (11) close to the end of the male end (10) Portion side；

Nose portion (13), the nose portion (13) are arranged in the end of the male end (10), and are in the external thread part (12) Close to the end side of the male end (10).

4. the nipple of antifatigue casing according to claim 3, which is characterized in that the big end of tube body (11) is certainly The external seal conical surface (111), the first inclined-plane (112), the first cylindrical surface (113) are respectively arranged with to end on the inside of the male end (10) With the first contra bevel (114)；

Wherein, the external seal conical surface (111) is the male end part of outer seal configuration (30), first inclined-plane (112), described First cylindrical surface (113) and first contra bevel (114) cooperatively form the male end part of the strain relief (40).

5. the nipple of antifatigue casing according to claim 4, which is characterized in that on the big end of tube body (11) At least partly transition arc is provided between two neighboring face.

6. the nipple of antifatigue casing according to claim 5, which is characterized in that the external seal conical surface (111) Transition arc is provided between first inclined-plane (112), and radius is R1,8mm≤R1≤12mm；

It is provided with transition arc between first inclined-plane (112) and first cylindrical surface (113), and radius is R2,8mm≤ R2≤12mm；

Transition arc is provided between first cylindrical surface (113) and first contra bevel (114), and radius is R3, 10mm≤R3≤12mm。

7. the nipple of antifatigue casing according to claim 4, which is characterized in that the external seal conical surface (111) Angle with tube body axis is α 1, and 1≤5 ° of 1.5 °≤α；

The angle of first inclined-plane (112) and tube body axis is α 2, and 2≤20 ° of 10 °≤α；

The angle of first contra bevel (114) the tube body axis is α 3, and 3≤20 ° of 10 °≤α.

8. the nipple of antifatigue casing according to claim 3, which is characterized in that the nose portion (13) is described in The second contra bevel (131), the second cylindrical surface (132), the second inclined-plane (133), the are respectively arranged with to end on the inside of male end (10) One inner sealing surface (134), third cylindrical surface (135), outer guiding surface (136) and circular bead surface (137)；

Wherein, second contra bevel (131), second cylindrical surface (132) and second inclined-plane (133) cooperatively form slot Shape structure, first inner sealing surface (134) and the third cylindrical surface (135) cooperatively form the inner seal structure (70) Male end part, the outer guiding surface (136) and the circular bead surface (137) cooperatively form the male end portion of the shoulder structure (80) Point.

9. the nipple of antifatigue casing according to claim 8, which is characterized in that on the nose portion (13) at least Partly transition arc is provided between two neighboring face.

10. the nipple of antifatigue casing according to claim 9, which is characterized in that second cylindrical surface (132) Transition arc is provided between second inclined-plane (133), and radius is R4,2mm≤R4≤6mm；

Transition arc is provided between second inclined-plane (133) and first inner sealing surface (134), and radius is R5,1mm ≤R5≤3mm；

Transition arc is provided between first inner sealing surface (134) and the third cylindrical surface (135), and radius is R6, 1mm≤R6≤3mm；

Transition arc is provided between the third cylindrical surface (135) and the outer guiding surface (136), and radius is R7,1mm ≤R7≤3mm；

It is provided with transition arc between the outer guiding surface (136) and the circular bead surface (137), and radius is R8,0.6mm≤ R8≤2mm。

11. the nipple of antifatigue casing according to claim 8, which is characterized in that second contra bevel (131) Angle with tube body axis is α 4, and 4≤30 ° of 20 °≤α；

The angle of second inclined-plane (133) and tube body axis is α 5, and 5≤30 ° of 15 °≤α；

The angle of first inner sealing surface (134) and tube body axis is α 6, and 6≤25 ° of 8 °≤α；

The angle of the outer guiding surface (136) and tube body axis is α 7, and 7≤30 ° of 10 °≤α；

The angle of the vertical plane of the circular bead surface (137) and tube body axis is α 8, and 8≤20 ° of 10 °≤α.

12. the nipple of antifatigue casing according to claim 1, which is characterized in that the female end (20) includes:

Stress release portion (21), middle part of stress release portion (21) setting in the female end (20)；

Internal thread part (22), internal thread part (22) setting is in the stress release portion (21) far from the female end (20) end Side；

Sealing station shoulder (23), sealing station shoulder (23) setting is in the internal thread part (22) far from the stress release portion (21) side；

Outer seal portion (24), outer seal portion (24) setting lean on the inside of close end, the external seal in the female end (20) Portion (24) is in side of the stress release portion (21) far from the internal thread part (22).

13. the nipple of antifatigue casing according to claim 12, which is characterized in that the stress release portion (21) Include:

External groove (211), outside of external groove (211) setting in the female end (20)；

Inner groovy (212), inside of inner groovy (212) setting in the female end (20)；

Wherein, the external groove (211) is staggered with the inner groovy (212), and the inner groovy (212) is in described outer recessed Side of the slot (211) close to the end of the female end (20).

14. the nipple of antifatigue casing according to claim 13, which is characterized in that the external groove (211) is certainly Side to the side far from the female end (20) end close to the female end (20) end is respectively arranged with third inclined-plane (2111), the 4th cylindrical surface (2112), the 4th inclined-plane (2113), the first arc surface (2114) and the 5th inclined-plane (2115)；

Wherein, institute is adapted to after the third inclined-plane (2111), the 4th cylindrical surface (2112) and the cooperation of the 4th inclined-plane (2113) It states inner groovy (212), the 4th inclined-plane (2113), first arc surface (2114) and the 5th inclined-plane (2115) cooperation The groove-like structure to recess on the inside of tube body is formed afterwards.

15. the nipple of antifatigue casing according to claim 14, which is characterized in that on the external groove (211) At least partly transition arc is provided between two neighboring face.

16. the nipple of antifatigue casing according to claim 15, which is characterized in that the 4th cylindrical surface (2112) transition arc is provided between first arc surface (2114), and radius is R9,8mm≤R9≤12mm；

The radius of first arc surface (2114) is R10,30mm≤R10≤50mm；

Transition arc is provided between 5th inclined-plane (2115) and the female end (20) outer surface, and radius is R11,10mm ≤R11≤30mm。

17. the nipple of antifatigue casing according to claim 14, which is characterized in that the third inclined-plane (2111) Angle with tube body axis is β 1, and 1≤6 ° of 2 °≤β；

The angle of 4th inclined-plane (2113) and tube body axis is β 2, and 2≤20 ° of 8 °≤β；

The angle of 5th inclined-plane (2115) and tube body axis is β 3, and 3≤15 ° of 5 °≤β.

18. the nipple of antifatigue casing according to claim 13, which is characterized in that the inner groovy (212) is certainly Side to the side far from the female end (20) end close to the female end (20) end is respectively arranged with the 6th inclined-plane (2121), the second arc surface (2122) and the 7th inclined-plane (2123)；

Wherein, the 6th inclined-plane (2121), second arc surface (2122) and the 7th inclined-plane (2123) cooperatively form Groove structure on the female end (20) inner wall.

19. the nipple of antifatigue casing according to claim 18, which is characterized in that second arc surface (2122) radius is R12,20mm≤R12≤40mm；

The angle of 6th inclined-plane (2121) and tube body axis is β 4, and 4≤12 ° of 6 °≤β；

The angle of 7th inclined-plane (2123) and tube body axis is β 5, and 5≤30 ° of 15 °≤β.

20. the nipple of antifatigue casing according to claim 12, which is characterized in that the sealing station shoulder (23) Include:

Interior sealing, the interior sealing setting is in the side of the internal thread part (22) far from the stress release portion (21)；

Side of the interior sealing far from the interior sealing is arranged in shoulders, the shoulders.

21. the nipple of antifatigue casing according to claim 20, which is characterized in that the sealing station shoulder (23) The 8th inclined-plane is respectively arranged with from the side close to the female end (20) end to the side far from the female end (20) end (231), the 5th cylindrical surface (232), the 9th inclined-plane (233), the second inner sealing surface (234), the 6th cylindrical surface (235), interior guiding Inclined-plane (236) and interior circular bead surface (237)；

Wherein, the 8th inclined-plane (231), the 5th cylindrical surface (232), the 9th inclined-plane (233), close in described second Cover (234) and the 6th cylindrical surface (235) cooperatively form interior sealing, the interior guiding surface (236) and interior described Shoulder face (237) cooperatively forms shoulders.

22. the nipple of antifatigue casing according to claim 21, which is characterized in that the 8th inclined-plane (231) Transition arc is provided between the 5th cylindrical surface (232), and radius is R13,2mm≤R13≤6mm；

Transition arc is provided between 5th cylindrical surface (232) and the 9th inclined-plane (233), and radius is R14,1mm ≤R14≤4mm；

Transition arc is provided between 9th inclined-plane (233) and second inner sealing surface (234), and radius is R15, 6mm≤R15≤15mm；

Transition arc is provided between second inner sealing surface (234) and the 6th cylindrical surface (235), and radius is R16, 1mm≤R16≤4mm；

Transition arc is provided between 6th cylindrical surface (235) and the interior guiding surface (236), and radius is R17, 1mm≤R17≤4mm；

Transition arc is provided between the interior guiding surface (236) and the interior circular bead surface (237), and radius is R18, 0.5mm≤R18≤1mm。

23. the nipple of antifatigue casing according to claim 21, which is characterized in that the 8th inclined-plane (231) Angle with tube body axis is β 6, and 6≤20 ° of 10 °≤β；

The angle of 9th inclined-plane (233) and tube body axis is β 7, and 7≤50 ° of 40 °≤β；

The angle of second inner sealing surface (234) and tube body axis is β 8, and 8≤25 ° of 8 °≤β；

The angle of the interior guiding surface (236) and tube body axis is β 9, and 9≤30 ° of 10 °≤β；

The angle of the interior circular bead surface (237) and tube body axis is β 10, and 10≤20 ° of 10 °≤β.

24. the nipple of antifatigue casing according to claim 12, which is characterized in that the outer seal portion (24) is certainly Female end (20) end to the side far from the female end (20) end is respectively arranged with the 7th cylindrical surface (241) and multiple close Seal unit；

Wave structure is formed after multiple sealing unit cooperations, and there is multiple top conical surfaces (245) and multiple bottom conical surfaces (247), multiple top conical surfaces (245) are on the tenth inclined-plane (242).

25. the nipple of antifatigue casing according to claim 24, which is characterized in that the bottom conical surface (247) For arcwall face, multiple bottom conical surfaces (247) have while the section on the 11st inclined-plane (243), and the described tenth tiltedly Face (242) is parallel to the 11st inclined-plane (243).

26. the nipple of antifatigue casing according to claim 24, which is characterized in that the tenth inclined-plane (242) Angle with tube body axis is β 11, and 11≤5 ° of 1.5 °≤β.

27. the nipple of antifatigue casing according to claim 24, which is characterized in that the sealing unit is from close The side of female end (20) end to far from the female end (20) end side be respectively arranged with the 12nd inclined-plane (244), The top conical surface (245), the 13rd inclined-plane (246), the bottom conical surface (247) and the 14th inclined-plane (248)；

Wherein, the 12nd inclined-plane (244), the top conical surface (245) and the 13rd inclined-plane (246) form protrusion knot Structure, the 13rd inclined-plane (246), the bottom conical surface (247) and the 14th inclined-plane (248) are from this sunk structure.

28. the nipple of antifatigue casing according to claim 27, which is characterized in that the 12nd inclined-plane (244) transition arc is provided between the top conical surface (245), and radius is R19,0.3mm≤R19≤1mm；

Transition arc is provided between the top conical surface (245) and the 13rd inclined-plane (246), and radius is R20, 0.3mm≤R20≤1mm；

The bottom conical surface (247) is arc structure, and the radius of the bottom conical surface (247) is R21,0.5mm≤R21≤ 1.5mm。

29. the nipple of antifatigue casing according to claim 27, which is characterized in that the 12nd inclined-plane It (244) is β 12 with the angle of tube body axis, and 12≤50 ° of 40 °≤β；

The angle of 13rd inclined-plane (246) and tube body axis is β 13, and 13≤30 ° of 10 °≤β；

The angle of 14th inclined-plane (248) and tube body axis is β 14, and 14≤50 ° of 40 °≤β.

30. the nipple of antifatigue casing according to claim 24, which is characterized in that the sealing unit is provided with Four, the length of the sealing unit is L, 2mm≤L≤3.5mm.

31. the nipple of antifatigue casing according to claim 2, which is characterized in that the inner seal structure (70) Slotted hole structure (60) are provided with, between the thread engaging structure (50) to improve the inner seal structure (70) and the spiral shell Sealed pressure distribution between line engaging structure (50).

Technical field

The present invention relates to the technical fields of pipe-line equipment, in particular to a kind of nipple of antifatigue casing.

Background technique

With petering out for landing field petroleum resources, Marine oil and gas resource will be developed largely, deep-sea ore-raising pipe, drilling well The nipples such as marine riser, production tubing and casing in addition to bear land oil gas pipe screw joint various load other than, also subject to Since ocean wave and ocean current bring recycle dynamic loading, it is desirable that ocean is with nipple in addition to land joint performance Outside, also to have anti-fatigue performance and prevent seawater from entering threaded interior and cause stress corrosion.

Existing standard API casing joint and Special threading connector have that the factor of stress concentration is big, and connector does not have Anti-fatigue performance.

Chinese patent CN203925329 discloses a kind of entitled " a kind of two-stage sealing nipple ", the patented technology Design has special inner seal structure and outer seal configuration, but its bonding strength is low, and it does not have anti-fatigue performance.

Chinese patent CN107503694 discloses the utility model patent of a kind of entitled " oil, casing thread connection ", should Patented technology screw thread is improved inclined trapezium structure, and sealing structure uses the second inner sealing surface as cylinder, and inner sealing surface is ball The structure in face, the sealing structure are able to maintain stable sealing performance under sleeve stress state, but produce and process and detect and is tired Difficulty, and sealing structure is easy accidental injury.

Summary of the invention

The main purpose of the present invention is to provide a kind of nipples of antifatigue casing, to solve set in the prior art Pipe screw joint does not have the problem of anti-fatigue performance.

To achieve the goals above, the present invention provides a kind of nipple of antifatigue casing, for the connection of pipeline, Include: male end, is provided with male connection in male end；Female end, female adapter is provided in female end, and male end and female end screw thread connects It connects；Wherein, at least one strain relief is provided in female end, to increase the fatigue strength of nipple.

Further, multiple connection structures are formed after male end and female end cooperation, multiple connection structures include: external seal knot Structure, outer seal configuration are positioned close to the end position of female end；Strain relief, strain relief are arranged in external seal knot Side of the structure close to the end of male end；Strain relief is arranged far from external seal knot in thread engaging structure, thread engaging structure The side of structure；Side of the thread engaging structure far from outer seal configuration is arranged in inner seal structure, inner seal structure；Shoulder knot Structure, shoulder structure setting are in the end position of male end in side of the inner seal structure far from outer seal configuration.

Further, male end includes: the big end of tube body, and the big end of tube body is arranged far from the position of the end of male end；Outside The big end of tube body is arranged in close to the end side of male end in threaded portion, external thread part；The end of male end is arranged in nose portion, nose portion Portion, and in external thread part close to the end side of male end.

Further, the big end of tube body is respectively arranged with the external seal conical surface, the first inclined-plane, first to end from the inside of male end Cylindrical surface and the first contra bevel；Wherein, the external seal conical surface is the male end part of outer seal configuration, the first inclined-plane, the first cylindrical surface The male end part of strain relief is cooperatively formed with the first contra bevel.

Further, the big end of tube body is provided with transition arc between partially two neighboring face.

Further, it is provided with transition arc between the external seal conical surface and the first inclined-plane, and radius is R1,8mm≤R1≤ 12mm；Transition arc is provided between first inclined-plane and the first cylindrical surface, and radius is R2,8mm≤R2≤12mm；First cylinder Transition arc is provided between face and the first contra bevel, and radius is R3,10mm≤R3≤12mm.

Further, the angle of the external seal conical surface and tube body axis is α 1, and 1≤5 ° of 1.5 °≤α；First inclined-plane and tube body The angle of axis is α 2, and 2≤20 ° of 10 °≤α；The angle of first contra bevel tube body axis is α 3, and 3≤20 ° of 10 °≤α.

Further, nose portion is respectively arranged with the second contra bevel, the second cylindrical surface, second tiltedly to end from the inside of male end Face, the first inner sealing surface, third cylindrical surface, outer guiding surface and circular bead surface；Wherein, the second contra bevel, the second cylindrical surface and Two inclined-planes cooperatively form groove-like structure, and the first inner sealing surface and third cylindrical surface cooperatively form the male end part of inner seal structure, Outer guiding surface and circular bead surface cooperatively form the male end part of shoulder structure.

Further, transition arc at least partly is provided between two neighboring face in nose portion.

Further, it is provided with transition arc between the second cylindrical surface and the second inclined-plane, and radius is R4,2mm≤R4≤ 6mm；Transition arc is provided between second inclined-plane and the first inner sealing surface, and radius is R5,1mm≤R5≤3mm；It is close in first Transition arc is provided between cover and third cylindrical surface, and radius is R6,1mm≤R6≤3mm；Third cylindrical surface and outer guiding Transition arc is provided between inclined-plane, and radius is R7,1mm≤R7≤3mm；It was provided between outer guiding surface and circular bead surface Circular arc is crossed, and radius is R8,0.6mm≤R8≤2mm.

Further, the angle of the second contra bevel and tube body axis is α 4, and 4≤30 ° of 20 °≤α；Second inclined-plane and tube body The angle of axis is α 5, and 5≤30 ° of 15 °≤α；The angle of first inner sealing surface and tube body axis is α 6, and 6≤25 ° of 8 °≤α； The angle of outer guiding surface and tube body axis is α 7, and 7≤30 ° of 10 °≤α；The angle of the vertical plane of circular bead surface and tube body axis For α 8, and 8≤20 ° of 10 °≤α.

Further, female end includes: stress release portion, and the middle part of female end is arranged in stress release portion；Internal thread part, interior spiral shell Side of the stress release portion far from female end end is arranged in line portion；Sealing station shoulder, the setting of sealing station shoulder are remote in internal thread part Side from stress release portion；The inside that female end leans on close end is arranged in outer seal portion, outer seal portion, and outer seal portion is in stress Side of the release portion far from internal thread part.

Further, stress release portion includes: external groove, and the outside of female end is arranged in external groove；Inner groovy, inner groovy are set It sets in the inside of female end；Wherein, external groove is staggered with inner groovy, and inner groovy is in external groove close to the one of the end of female end Side.

Further, external groove is respectively arranged with third from the side close to female end end to the side far from female end end Inclined-plane, the 4th cylindrical surface, the 4th inclined-plane, the first arc surface and the 5th inclined-plane；Wherein, third inclined-plane, the 4th cylindrical surface and the 4th It is adapted to inner groovy after inclined-plane cooperation, is formed after the 4th inclined-plane, the first arc surface and the cooperation of the 5th inclined-plane to recess on the inside of tube body Groove-like structure.

Further, transition arc at least partly is provided between two neighboring face in external groove.

Further, transition arc is provided between the 4th cylindrical surface and the first arc surface, and radius is R9,8mm≤R9 ≤12mm；The radius of first arc surface is R10,30mm≤R10≤50mm；It was provided between 5th inclined-plane and female end outer surface Circular arc is crossed, and radius is R11,10mm≤R11≤30mm.

Further, the angle of third inclined-plane and tube body axis is β 1, and 1≤6 ° of 2 °≤β；4th inclined-plane and tube body axis Angle be β 2, and 2≤20 ° of 8 °≤β；The angle of 5th inclined-plane and tube body axis is β 3, and 3≤15 ° of 5 °≤β.

Further, inner groovy is respectively arranged with the 6th from the side close to female end end to the side far from female end end Inclined-plane, the second arc surface and the 7th inclined-plane；Wherein, the 6th inclined-plane, the second arc surface and the 7th inclined-plane are cooperatively formed in female end Groove structure on inner wall.

Further, the radius of the second arc surface is R12,20mm≤R12≤40mm；The folder on the 6th inclined-plane and tube body axis Angle is β 4, and 4≤12 ° of 6 °≤β；The angle of 7th inclined-plane and tube body axis is β 5, and 5≤30 ° of 15 °≤β.

Further, sealing station shoulder includes: interior sealing, and interior sealing is arranged in internal thread part far from stress release portion Side；Side of the interior sealing far from interior sealing is arranged in shoulders, shoulders.

Further, sealing station shoulder is respectively arranged with from the side close to female end end to the side far from female end end 8th inclined-plane, the 5th cylindrical surface, the 9th inclined-plane, the second inner sealing surface, the 6th cylindrical surface, interior guiding surface and interior circular bead surface；Its In, the 8th inclined-plane, the 5th cylindrical surface, the 9th inclined-plane, the second inner sealing surface and the 6th cylindrical surface cooperatively form interior sealing, inside lead Shoulders is cooperatively formed to inclined-plane and interior circular bead surface.

Further, transition arc is provided between the 8th inclined-plane and the 5th cylindrical surface, and radius is R13,2mm≤R13 ≤6mm；Transition arc is provided between 5th cylindrical surface and the 9th inclined-plane, and radius is R14,1mm≤R14≤4mm；9th tiltedly Transition arc is provided between face and the second inner sealing surface, and radius is R15,6mm≤R15≤15mm；Second inner sealing surface with Transition arc is provided between 6th cylindrical surface, and radius is R16,1mm≤R16≤4mm；6th cylindrical surface and interior guiding surface Between be provided with transition arc, and radius is R17,1mm≤R17≤4mm；It was provided between interior guiding surface and interior circular bead surface Circular arc is crossed, and radius is R18,0.5mm≤R18≤1mm.

Further, the angle of the 8th inclined-plane and tube body axis is β 6, and 6≤20 ° of 10 °≤β；9th inclined-plane and tube body axis The angle of line is β 7, and 7≤50 ° of 40 °≤β；The angle of second inner sealing surface and tube body axis is β 8, and 8≤25 ° of 8 °≤β；It is interior The angle of guiding surface and tube body axis is β 9, and 9≤30 ° of 10 °≤β；The angle of interior circular bead surface and tube body axis is β 10, and 10°≤β10≤20°。

Further, outer seal portion from female end end to far from female end end side be respectively arranged with the 7th cylindrical surface and Multiple sealing units；Wave structure is formed after multiple sealing unit cooperations, and there is multiple top conical surfaces and multiple bottom conical surfaces, Multiple top conical surfaces are on the tenth inclined-plane.

Further, the bottom conical surface is arcwall face, and multiple bottom conical surfaces have while the section on the 11st inclined-plane, Tenth inclined-plane is parallel to the 11st inclined-plane.

Further, the angle of the tenth inclined-plane and tube body axis is β 11, and 11≤5 ° of 1.5 °≤β.

Further, sealing unit is respectively arranged with the from the side close to female end end to the side far from female end end 12 inclined-planes, the top conical surface, the 13rd inclined-plane, the bottom conical surface and the 14th inclined-plane；Wherein, the 12nd inclined-plane, the top conical surface and 13rd inclined-plane forms bulge-structure, and the 13rd inclined-plane, the bottom conical surface and the 14th inclined-plane are from this sunk structure.

Further, it is provided with transition arc between the 12nd inclined-plane and the top conical surface, and radius is R19,0.3mm≤ R19≤1mm；Transition arc is provided between the top conical surface and the 13rd inclined-plane, and radius is R20,0.3mm≤R20≤1mm； The bottom conical surface is arc structure, and the radius of the bottom conical surface is R21,0.5mm≤R21≤1.5mm.

Further, the angle of the 12nd inclined-plane and tube body axis is β 12, and 12≤50 ° of 40 °≤β；13rd inclined-plane with The angle of tube body axis is β 13, and 13≤30 ° of 10 °≤β；The angle of 14th inclined-plane and tube body axis is β 14, and 40 °≤β 14≤50°。

Further, there are four sealing unit settings, the length of sealing unit is L, 2mm≤L≤3.5mm.

Further, slotted hole structure is provided between inner seal structure and thread engaging structure, to improve inner seal structure Sealed pressure distribution between thread engaging structure.

It applies the technical scheme of the present invention, the setting of strain relief can make casing thread connection have certain resist Fatigue strength, and then make casing thread connection that there is anti-fatigue performance.Casing thread connection can be made to guarantee that connection is strong in this way There is corresponding anti-fatigue performance while spending, improve the service performance and service life of casing thread connection.Skill of the invention Art scheme efficiently solves the problems, such as that casing thread connection in the prior art does not have anti-fatigue performance.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:

Fig. 1 shows the structural schematic diagram of the embodiment of the nipple of antifatigue casing according to the present invention；

Fig. 2 shows the structural schematic diagrams of male end in the present invention；

Fig. 3 shows the enlarged drawing of the big end of tube body at A in Fig. 2；

Fig. 4 shows the enlarged drawing of nose portion at B in Fig. 2；

Fig. 5 shows the structural schematic diagram of female end in the present invention；

Fig. 6 shows the enlarged drawing of sealing station shoulder at C in Fig. 5；

Fig. 7 shows the enlarged drawing of outer seal portion at D in Fig. 5；

Fig. 8 shows the enlarged drawing of sealing unit at E in Fig. 7.

Wherein, the above drawings include the following reference numerals:

10, male end；11, the big end of tube body；111, the external seal conical surface；112, the first inclined-plane；113, the first cylindrical surface；114, First contra bevel；12, external thread part；13, nose portion；131, the second contra bevel；132, the second cylindrical surface；133, the second inclined-plane； 134, the first inner sealing surface；135, third cylindrical surface；136, outer guiding surface；137, circular bead surface；20, female end；21, stress release Portion；211, external groove；2111, third inclined-plane；2112, the 4th cylindrical surface；2113, the 4th inclined-plane；2114, the first arc surface； 2115, the 5th inclined-plane；212, inner groovy；2121, the 6th inclined-plane；2122, the second arc surface；2123, the 7th inclined-plane；22, interior spiral shell Line portion；23, sealing station shoulder；231, the 8th inclined-plane；232, the 5th cylindrical surface；233, the 9th inclined-plane；234, the second inner sealing surface； 235, the 6th cylindrical surface；236, interior guiding surface；237, interior circular bead surface；24, outer seal portion；241, the 7th cylindrical surface；242, Ten inclined-planes；243, the 11st inclined-plane；244, the 12nd inclined-plane；245, the top conical surface；246, the 13rd inclined-plane；247, bottom is bored Face；248, the 14th inclined-plane；30, outer seal configuration；40, strain relief；50, thread engaging structure；60, slotted hole structure； 70, inner seal structure；80, shoulder structure.

Specific embodiment

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 to 8, the nipple of the antifatigue casing of one of the present embodiment, for the connection of pipeline, packet Include male end 10 and female end 20.Male connection is provided in male end 10.Female adapter, male end 10 and mother are provided in female end 20 End 20 is threadedly coupled.Wherein, at least one strain relief 40 is provided in female end 20, it is strong with the fatigue for increasing nipple Degree.

Using the technical solution of the present embodiment, it is certain that the setting of strain relief 40 can be such that casing thread connection has Fatigue resistance, and then make casing thread connection have anti-fatigue performance.Casing thread connection can be made to guarantee to connect in this way There is corresponding anti-fatigue performance while connecing intensity, improve the service performance and service life of casing thread connection.This implementation The technical solution of example efficiently solves the problems, such as that casing thread connection in the prior art does not have anti-fatigue performance.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, male end 10 and female end 20 form multiple companies after cooperating Binding structure, multiple connection structures include outer seal configuration 30, strain relief 40, thread engaging structure 50, inner seal structure 70 and shoulder structure 80.Outer seal configuration 30 is positioned close to the end position of female end 20.Strain relief 40 is arranged outside Side of the sealing structure 30 close to the end of male end 10.Strain relief 40 is arranged far from external seal knot in thread engaging structure 50 The side of structure 30.Side of the thread engaging structure 50 far from outer seal configuration 30 is arranged in inner seal structure 70.Shoulder structure 80 Side of the inner seal structure 70 far from outer seal configuration 30 is set, and is in the end position of male end 10.Above structure is being protected It can make casing thread connection that there is more excellent leakproofness and bonding strength while demonstrate,proving casing thread connection anti-fatigue performance. Male end 10 and female end 20 can be process for tube body, can also be process by box cupling.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, male end 10 includes the big end 11 of tube body, external thread part 12 and nose portion 13.The big end 11 of tube body is arranged far from the position of the end of male end 10.The setting of external thread part 12 is big in tube body End 11 is close to the end side of male end 10.The end of male end 10 is arranged in nose portion 13, and in external thread part 12 close to public The end side at end 10.The setting of the big end 11 of above structure middle tube body is used to cooperate strain relief 40, can also be used as A part of strain relief 40, the setting of nose portion 13 are used to improve the stability of tube body connection.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the big end 11 of tube body is from the inside of male end 10 to end It is respectively arranged with the external seal conical surface 111, the first inclined-plane 112, the first cylindrical surface 113 and the first contra bevel 114.Wherein, external seal The conical surface 111 is the male end part of outer seal configuration 30, the first inclined-plane 112, the first cylindrical surface 113 and the cooperation of the first contra bevel 114 Form the male end part of strain relief 40.Transition at least partly is provided between two neighboring face on the big end 11 of tube body Circular arc.Above structure stress concentration can occur while the performance of proof stress release structure 40 to avoid the part.

Wherein, transition arc is provided between the external seal conical surface 111 and the first inclined-plane 112, and radius is R1,8mm≤R1 ≤12mm.Transition arc is provided between first inclined-plane 112 and the first cylindrical surface 113, and radius is R2,8mm≤R2≤12mm. Transition arc is provided between first cylindrical surface 113 and the first contra bevel 114, and radius is R3,10mm≤R3≤12mm.It is above-mentioned Structure, which can further decrease, there is stress concentration in male end 10.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the external seal conical surface 111 and the angle of tube body axis are α 1, and 1≤5 ° of 1.5 °≤α.The angle of first inclined-plane 112 and tube body axis is α 2, and 2≤20 ° of 10 °≤α.First contra bevel The angle of 114 tube body axis is α 3, and 3≤20 ° of 10 °≤α.Above structure can make the big end 11 of tube body form annular groove, Preferably to cooperate strain relief 40.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, nose portion 13 is distinguished from 10 inside to end of male end Be provided with the second contra bevel 131, the second cylindrical surface 132, the second inclined-plane 133, the first inner sealing surface 134, third cylindrical surface 135, Outer guiding surface 136 and circular bead surface 137.Wherein, the second contra bevel 131, the second cylindrical surface 132 and the second inclined-plane 133 cooperate shape At groove-like structure, the first inner sealing surface 134 and third cylindrical surface 135 cooperatively form the male end part of inner seal structure 70, lead outside The male end part of shoulder structure 80 is cooperatively formed to inclined-plane 136 and circular bead surface 137.Public affairs of the above structure as inner seal structure 70 The male end part of end part and shoulder structure 80 can improve the casing thread connection after connecting while guaranteeing leakproofness, With higher stability.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, at least partly two neighboring face in nose portion 13 Between be provided with transition arc.Transition arc is provided between second cylindrical surface 132 and the second inclined-plane 133, and radius is R4, 2mm≤R4≤6mm.It is provided with transition arc between second inclined-plane 133 and the first inner sealing surface 134, and radius is R5,1mm≤ R5≤3mm.It is provided with transition arc between first inner sealing surface 134 and third cylindrical surface 135, and radius is R6,1mm≤R6≤ 3mm.Transition arc is provided between third cylindrical surface 135 and outer guiding surface 136, and radius is R7,1mm≤R7≤3mm.Outside Transition arc is provided between guiding surface 136 and circular bead surface 137, and radius is R8,0.6mm≤R8≤2mm.Above structure can Occurs stress concentration in male end 10 to further decrease.And keep the cooperation between male end 10 and female end 20 even closer.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the angle of the second contra bevel 131 and tube body axis is α 4, and 4≤30 ° of 20 °≤α.The angle of second inclined-plane 133 and tube body axis is α 5, and 5≤30 ° of 15 °≤α.First inner sealing surface 134 and the angle of tube body axis are α 6, and 6≤25 ° of 8 °≤α.The angle of outer guiding surface 136 and tube body axis is α 7, and 10 ° ≤α7≤30°.The angle of the vertical plane of circular bead surface 137 and tube body axis is α 8, and 8≤20 ° of 10 °≤α.Above structure is further Casing thread connection after improving connection has higher stability while guaranteeing leakproofness.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, female end 20 includes stress release portion 21, internal thread part 22, sealing station shoulder 23 and outer seal portion 24.The middle part of female end 20 is arranged in stress release portion 21.The setting of internal thread part 22 is being answered 21 side far from 20 end of female end of power release portion.Internal thread part 22 is arranged in far from stress release portion 21 in sealing station shoulder 23 Side.The inside that female end 20 leans on close end is arranged in outer seal portion 24, and outer seal portion 24 is in stress release portion 21 far from interior spiral shell The side in line portion 22.Above structure can make female end 20 corresponding with the structure of male end 10, in order to form outer seal configuration 30, answer Power discharges structure 40, thread engaging structure 50, inner seal structure 70 and shoulder structure 80.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, stress release portion 21 includes external groove 211 and indent Slot 212.The outside of female end 20 is arranged in external groove 211.The inside of female end 20 is arranged in inner groovy 212.Wherein, external groove 211 It is staggered with inner groovy 212, inner groovy 212 is in external groove 211 close to the side of the end of female end 20.Above structure can be with Preferably discharge stress.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, side of the external groove 211 from close 20 end of female end Third inclined-plane 2111, the 4th cylindrical surface 2112, the 4th inclined-plane 2113, first are respectively arranged with to the side far from 20 end of female end Arc surface 2114 and the 5th inclined-plane 2115.Wherein, after third inclined-plane 2111, the 4th cylindrical surface 2112 and the cooperation of the 4th inclined-plane 2113 It is adapted to inner groovy 212, is formed after the 4th inclined-plane 2113, the first arc surface 2114 and the cooperation of the 5th inclined-plane 2115 recessed to tube body inside Sunken groove-like structure.Above structure can be released the stress for being applied to 20 outside of female end, corresponding corresponding part male end The stress of 10 structure can also release.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, at least partly two neighboring face in external groove 211 Between be provided with transition arc.Transition arc is provided between 4th cylindrical surface 2112 and the first arc surface 2114, and radius is R9,8mm≤R9≤12mm.The radius of first arc surface 2114 is R10,30mm≤R10≤50mm.5th inclined-plane 2115 and female end Transition arc is provided between 20 outer surfaces, and radius is R11,10mm≤R11≤30mm.Above structure can be further improved Stress release effect.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the angle of third inclined-plane 2111 and tube body axis is β 1, and 1≤6 ° of 2 °≤β.The angle of 4th inclined-plane 2113 and tube body axis is β 2, and 2≤20 ° of 8 °≤β.5th inclined-plane 2115 with The angle of tube body axis is β 3, and 3≤15 ° of 5 °≤β.Above structure can preferably be cooperated with external groove 211.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, side of the inner groovy 212 from close 20 end of female end The 6th inclined-plane 2121, the second arc surface 2122 and the 7th inclined-plane 2123 are respectively arranged with to the side far from 20 end of female end.Its In, the 6th inclined-plane 2121, the second arc surface 2122 and the 7th inclined-plane 2123 cooperatively form the groove knot on 20 inner wall of female end Structure.Above structure can be released the stress for being applied to 20 inside of female end.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the radius of the second arc surface 2122 is R12,20mm ≤R12≤40mm.The angle of 6th inclined-plane 2121 and tube body axis is β 4, and 4≤12 ° of 6 °≤β.7th inclined-plane 2123 and tube body The angle of axis is β 5, and 5≤30 ° of 15 °≤β.Above structure can preferably be cooperated with inner groovy 212.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, sealing station shoulder 23 includes interior sealing and shoulder Portion.Side of the internal thread part 22 far from stress release portion 21 is arranged in interior sealing.Shoulders setting is in interior sealing far from interior The side of sealing.The casing thread connection after connection can be improved while guaranteeing leakproofness with higher in above structure Stability.The structure is corresponding with the nose portion 13 of male end 10.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, sealing station shoulder 23 is from close to 20 end of female end Side to the side far from 20 end of female end is respectively arranged with the 8th inclined-plane 231, the 5th cylindrical surface 232, the 9th inclined-plane 233, the Two inner sealing surfaces 234, the 6th cylindrical surface 235, interior guiding surface 236 and interior circular bead surface 237.Wherein, the 8th inclined-plane the 231, the 5th Cylindrical surface 232, the 9th inclined-plane 233, the second inner sealing surface 234 and the 6th cylindrical surface 235 cooperatively form interior sealing, and interior guiding is oblique Face 236 and interior circular bead surface 237 cooperatively form shoulders.The casing thread connection that above structure further increases after connection is guaranteeing There is higher stability while leakproofness.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, between the 8th inclined-plane 231 and the 5th cylindrical surface 232 It is provided with transition arc, and radius is R13,2mm≤R13≤6mm.It is provided between 5th cylindrical surface 232 and the 9th inclined-plane 233 Transition arc, and radius is R14,1mm≤R14≤4mm.Transition is provided between 9th inclined-plane 233 and the second inner sealing surface 234 Circular arc, and radius is R15,6mm≤R15≤15mm.Transition is provided between second inner sealing surface 234 and the 6th cylindrical surface 235 Circular arc, and radius is R16,1mm≤R16≤4mm.Transition circle is provided between 6th cylindrical surface 235 and interior guiding surface 236 Arc, and radius is R17,1mm≤R17≤4mm.It is provided with transition arc between interior guiding surface 236 and interior circular bead surface 237, and Radius is R18,0.5mm≤R18≤1mm.Can be to avoid there is stress concentration in female end 20 in above structure.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the angle on the 8th inclined-plane 231 and tube body axis is β 6, and 6≤20 ° of 10 °≤β.The angle of 9th inclined-plane 233 and tube body axis is β 7, and 7≤50 ° of 40 °≤β.Second inner sealing surface 234 and the angle of tube body axis are β 8, and 8≤25 ° of 8 °≤β.The angle of interior guiding surface 236 and tube body axis is β 9, and 10 ° ≤β9≤30°.The angle of interior circular bead surface 237 and tube body axis is β 10, and 10≤20 ° of 10 °≤β.Above structure can make female end 20 and male end 10 cooperation it is more reliable and more stable.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, outer seal portion 24 is from 20 end of female end to far from female The side of 20 ends is held to be respectively arranged with the 7th cylindrical surface 241 and multiple sealing units.Wave is formed after multiple sealing unit cooperations Unrestrained structure, and there is multiple top conical surfaces 245 and multiple bottom conical surfaces 247, multiple top conical surfaces 245 are in the tenth inclined-plane On 242.Above structure can be further improved the leakproofness of nipple, while can protect to strain relief 40 Shield.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the bottom conical surface 247 is arcwall face, multiple bottom cones Face 247 has while the section on the 11st inclined-plane 243, and the tenth inclined-plane 242 is parallel to the 11st inclined-plane 243.Above-mentioned knot Structure can be further improved the sealing intensity of outer seal portion 24.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the angle on the tenth inclined-plane 242 and tube body axis is β 11, and 11≤5 ° of 1.5 °≤β.Above-mentioned angle can be such that the tenth inclined-plane 242 and the 11st inclined-plane 243 preferably matches with male end 10 It closes, and forms multilayer external seal.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, side of the sealing unit from close 20 end of female end The 12nd inclined-plane 244, the top conical surface 245, the 13rd inclined-plane 246, bottom are respectively arranged with to the side far from 20 end of female end The conical surface 247 and the 14th inclined-plane 248.Wherein, the 12nd inclined-plane 244, the top conical surface 245 and the 13rd inclined-plane 246 form protrusion Structure, the 13rd inclined-plane 246, the bottom conical surface 247 and the 14th inclined-plane 248 are from this sunk structure.Above structure can make to seal Unit has better sealing.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, between the 12nd inclined-plane 244 and the top conical surface 245 It is provided with transition arc, and radius is R19,0.3mm≤R19≤1mm.It is arranged between the top conical surface 245 and the 13rd inclined-plane 246 There is transition arc, and radius is R20,0.3mm≤R20≤1mm.The bottom conical surface 247 is arc structure, the half of the bottom conical surface 247 Diameter is R21,0.5mm≤R21≤1.5mm.Above structure can be further improved the sealing performance of outer seal portion 24, avoid outer close There is stress concentration in envelope portion 24.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, the angle on the 12nd inclined-plane 244 and tube body axis is β 12, and 12≤50 ° of 40 °≤β.The angle of 13rd inclined-plane 246 and tube body axis is β 13, and 13≤30 ° of 10 °≤β.14th The angle of inclined-plane 248 and tube body axis is β 14, and 14≤50 ° of 40 °≤β.The sealing of one step of above structure raising outer seal portion 24 Intensity.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, there are four sealing unit settings, the length of sealing unit Degree is L, 2mm≤L≤3.5mm.Above structure can make outer seal portion 24 have four-layer seal, while improving sealing performance Preferably protect strain relief 40.

As shown in Figures 1 to 8, in the technical scheme of this embodiment, inner seal structure 70 and thread engaging structure 50 it Between be provided with slotted hole structure 60, with improve the sealed pressure between inner seal structure 70 and thread engaging structure 50 distribution.It is above-mentioned Structure can improve the distribution of the sealed pressure between inner seal structure 70 and thread engaging structure 50, improve casing thread connection Overall performance.