CN201818929U - Threaded connector of pipe for oil and gas industry - Google Patents
Threaded connector of pipe for oil and gas industry Download PDFInfo
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- CN201818929U CN201818929U CN2010202506547U CN201020250654U CN201818929U CN 201818929 U CN201818929 U CN 201818929U CN 2010202506547 U CN2010202506547 U CN 2010202506547U CN 201020250654 U CN201020250654 U CN 201020250654U CN 201818929 U CN201818929 U CN 201818929U
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- 238000007789 sealing Methods 0.000 claims abstract description 47
- 230000007704 transition Effects 0.000 claims description 32
- 239000003209 petroleum derivative Substances 0.000 claims description 17
- 239000011324 bead Substances 0.000 claims description 6
- 230000001815 facial effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a threaded connector of a pipe for oil and gas industries, which aims to provide the threaded connector which achieves high connection performance and high sealing stability and low processing difficulty. External threads of a pipe body and internal threads of a coupling are buttress threads, the ratio of the tooth height and the thread pitch is 0.25-0.35, the bearing face angle is minus 15 degrees to 3 degrees, the guide face angle is 10-50 degrees, and a clearance is formed between tooth tops and tooth bottoms after thread engagement; and a sealing part between the pipe body and the coupling on a threaded side face is in sequence provided with a first cylindrical transitional area, a cylindrical sealed area, a second cylindrical transitional area, a conical sealed area and a conical transitional area, and the end of the conical transitional area is provided with a torque shoulder. The connector adopts the improved API (American Petroleum Institute) buttress threads, and thus the strength of threaded connection is improved. The cylindrical and conical combined sealing structure is adopted, two sealing surfaces are effectively separated through the cylindrical transitional areas, and thus the sealing reliability is ensured. Moreover, the processing difficulty is reduced, the production efficiency and the yield are improved, and the cost is decreased.
Description
Technical field
The utility model relates to a kind of thread connector of petroleum gas industrial tube.
Background technique
Thread connector of petroleum gas industrial tube generally is made of the structure of screw thread, sealing and torque shoulder three parts.For many years, people are always by constantly improving screw thread, sealing and the torque shoulder of joint, to reach the gentle Seal Design requirement of intensity.
Aspect screw thread design, adopt the API buttress thread fully, for the high steel-grade bushing of major-diameter thick-wall, the screw thread slip phenomenon can appear, and therefore select suitable flank angle and tooth depth and pitch ratio very important.
Aspect Seal Design, box cupling type screw thread has single sealing and seals two kinds more, and the Seal Design of domestic announcement mainly adopts single sealing configuration, and multi-sealing structure increases gradually in recent years, and the U.S. adopts multi-sealing structure more.In order to guarantee excellent sealing performance, the employing list seals must increase sealed increscence amount, increase seal length or both increase simultaneously, and this just requires high machining accuracy, and the thread gluing phenomenon easily takes place.Adopt multi-sealing structure can reduce the drawback of single sealing, two sealing surfaces are not isolated but have multi-sealing structure now, its effect is identical with single sealing, the reliability deficiency of sealing.Though adopt many sealings of two torque shoulder to separate sealing surface, difficulty of processing is big, yield rate is low.
The model utility content
The utility model is in order to overcome deficiency of the prior art, a kind of switching performance height to be provided, and difficulty of processing is little, the thread connector of petroleum gas industrial tube of sealing good stability.
The utility model is achieved through the following technical solutions:
A kind of thread connector of petroleum gas industrial tube, having the box cupling that externally threaded body and end have internal thread by the end is formed by connecting, it is characterized in that, the outside thread of described body and the internal thread of box cupling are the buttress thread that cooperatively interacts, tooth depth is 0.25～0.35 with the ratio of pitch, the supporting plane angle is-15～3 °, and the guide surface angle is 10～50 °, has the gap between at the bottom of tooth top and the tooth after the thread engagement; Hermetic unit between whorl side facial canal body and box cupling is disposed with the first cylinder transition zone, cylindricality seal area, the second cylinder transition zone, cone seal district, conical surface transition district, and the tapering of described cone seal district two conical surfaces is identical; The end in described conical surface transition district is a torque shoulder.
The hermetic unit of outside thread side is followed successively by the first exterior cylindrical transitional surface on the described body, the exterior cylindrical sealing surface, the second exterior cylindrical transitional surface, the external conical shape sealing surface, the external conical shape transitional surface, described external conical shape transitional surface is connected with outer torque shoulder face, the hermetic unit of internal thread side is followed successively by the first interior cylindrical face on the described box cupling, the second interior cylindrical face, the inner conical face, described inner conical face is connected with the internal torque circular bead surface, leave the gap between described first exterior cylindrical transitional surface and the described first interior cylindrical face and form the described first cylinder transition zone, form described cylindricality seal area by interference fit between described exterior cylindrical sealing surface and the described second interior cylindrical face, leave the gap between described second exterior cylindrical transitional surface and the described second interior cylindrical face and form described second transition zone, form described cone seal district by interference fit between described external conical shape sealing surface and the described inner conical face, leave the gap between described external conical shape transitional surface and the described inner conical face and form described conical surface transition district, described external conical shape sealing surface is identical with the taper angle of described inner conical face, and the angle of described outer torque shoulder face and internal torque circular bead surface and body axis normal face is respectively-30～0 °.
Described cylindricality seal area is high interference, little seal length structure, and described cone seal district is low interference, big seal length structure.
The radial interference amount of described cylindricality seal area is 0.3～1.5mm, and the seal length of cylindricality seal area is greater than half of pitch; The radial interference amount in described cone seal district is 0.1～0.5mm, and the seal length in cone seal district is 2～10mm.
Tapering is 1: 20～1: 10 on the helical thread portion diametric(al).
The taper angle of described external conical shape transitional surface is 30～60 °.
All surface of discontinuity all adopt arc transition, and knuckle radius is 0.3～1mm.
Gap length after the thread engagement between at the bottom of tooth top and the tooth is 0.05～0.2mm.
The taper angle of described external conical shape sealing surface and described inner conical face is 10～20 °.
The utlity model has following technique effect:
1, pipe screw joint of the present utility model has improved the intensity that is threaded by adopting improved API buttress thread, can avoid occurring the screw thread slip phenomenon.
2, pipe screw joint of the present utility model adopts the compound sealing structure of the cylinder and the conical surface, and by the cylinder transition zone two sealing surfaces is effectively isolated, and has guaranteed the reliability of sealing.
3, all surface of discontinuity of pipe screw joint of the present utility model adopt arc transition, have reduced stress and have concentrated, and avoid causing that the brittle material fracture makes object produce fatigue crack, have improved join strength.
4, pipe screw joint of the present utility model adopts the compound sealing structure of the cylinder and the conical surface, and is not high to the required precision of processing, reduced difficulty of processing, is convenient to extensive enforcement, helps enhancing productivity, and reduces production costs, and improves yield rate.
5, pipe screw joint of the present utility model is when internal thread and outside thread engagement, and except that there was interference in hermetic unit, all there was certain clearance in other parts, can reduce screw thread thread gluing trend.
Description of drawings
Fig. 1 is the overall schematic of the utility model thread connector of petroleum gas industrial tube;
Fig. 2 is the local enlarged diagram in the utility model sealing position;
Fig. 3 is the female thread structure schematic representation of collar segments;
Fig. 4 is the external thread structure schematic representation of body portion;
Fig. 5 is the screw thread form structural representation;
Fig. 6 is the thread engagement schematic representation.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
The schematic representation of the utility model thread connector of petroleum gas industrial tube such as Fig. 1-shown in Figure 6 have the body 2 of outside thread 15 and box cupling 1 that the end has internal thread 10 is formed by connecting by the end.Outside thread 15 on the described body 2 and the buttress thread of the internal thread on the box cupling 1 10 for cooperatively interacting, tooth depth is 0.25～0.35 with the ratio of pitch, supporting plane angle t2 is-15～3 °, and guide surface angle t1 is 10～50 °, to guarantee different specification size and the different grade of steels performance that is threaded.Have gap I3 between at the bottom of outside thread and internal thread engagement back tooth top and the tooth, the size of gap I3 is 0.05～0.2mm.Tapering is 1: 20～1: 10 on the helical thread portion diametric(al).Hermetic unit between whorl side facial canal body and box cupling is disposed with the first cylinder transition zone 4, cylindricality seal area 5, the second cylinder transition zone 6, cone seal district 7, conical surface transition district 8, and the tapering of described cone seal district two conical surfaces is identical.The end in described conical surface transition district 8 is a torque shoulder 9.The first cylinder transition zone 4 realizes the transition of body outside thread 15 and box cupling internal thread 10 and cylindricality seal area 5, the damage of avoiding meshing the double thread face.The second cylinder transition zone 6 realizes effective isolation in cylinder seal area 5 and cone seal district 7.Conical surface transition district 8 realizes the smooth transition of body and box cupling, guarantees the joint sealing quality.The location that torque shoulder 9 is used to be threaded and absorb too high torque wrench moment.All excessive faces all can absorb unnecessary thread compound, reduce the influence of thread compound to metallic seal.
Concentrate for fear of stress, all surface of discontinuity all adopt arc transition, and knuckle radius R1, R2, R3 are 0.3～1mm.
The design of transition zone and seal area realizes by the following structure of body and box cupling: the hermetic unit of outside thread 15 sides is followed successively by the first exterior cylindrical transitional surface 16, exterior cylindrical sealing surface 17, the second exterior cylindrical transitional surface 18, external conical shape sealing surface 19, external conical shape transitional surface 20 on the described body 2, and described external conical shape transitional surface 20 is connected with outer torque shoulder face 21.The hermetic unit of internal thread 10 sides is followed successively by the first interior cylindrical face 11, the second interior cylindrical face 12, inner conical face 13 on the described box cupling 1, and described inner conical face 13 is connected with internal torque circular bead surface 14.Leave the gap between described first exterior cylindrical transitional surface 16 and the described first interior cylindrical face 11 and form the described first cylinder transition zone 4.Form described cylindricality seal area 5 by interference fit between described exterior cylindrical sealing surface 17 and the described second interior cylindrical face 12, realize the seal action of metal to metal.Leave the gap between described second exterior cylindrical transitional surface 18 and the described second interior cylindrical face 12 and form described second transition zone 6.Form described cone seal district 7 by interference fit between described external conical shape sealing surface 19 and the described inner conical face 13, realize the seal action of metal to metal.Leave the gap between described external conical shape transitional surface 20 and the described inner conical face 13 and form described conical surface transition district 8, described external conical shape sealing surface 19 is identical with the taper angle of described inner conical face 13, the taper angle of described external conical shape sealing surface and described inner conical face is 10～20 °, i.e. ps3=bs3=10～20 °.Described outer torque shoulder face 21 is ps1 with the angle of body axis normal face, and internal torque circular bead surface 14 is bs1 with the angle of body axis normal face, bs1=ps1=-30～0 °.
Wherein, described cylindricality seal area is high interference, little seal length structure, reduces with the sealability of avoiding causing because of thrust load.The radial interference amount I2 of described cylindricality seal area is generally 0.3～1.5mm, and the seal length b2 of cylindricality seal area is greater than half of pitch.Described cone seal district is low interference, big seal length structure, and conical surface seal can reduce the bonding trend of sealing surface.The radial interference amount I1 in described cone seal district is generally 0.1～0.5mm, and the seal length b1 in cone seal district is 2～10mm.
The taper angle ps2 of described external conical shape transitional surface 20 is 30～60 °.
Below be elaborated as embodiment with 88.9 * 6.45mm oil pipe and 177.8 * 9.19mm sleeve pipe respectively.
Embodiment 1:88.9 * 6.45mm oil pipe
Pitch is 4.2mm, the outside thread tooth depth is 1mm, internal thread tooth depth 1.1mm, the internal thread tooth depth is 0.26 with the ratio of pitch, differ 0.1mm between internal thread and the outside thread, when the engagement of internal thread and outside thread,, make to have gap I3=0.1mm with the outside thread tooth top at the bottom of the internal thread tooth because tooth depth there are differences.T2=-10 ° at supporting plane angle, t1=30 ° at guide surface angle, chamfering R1=0.3mm, R2=0.6mm, ps1=bs1=-10 °, ps2=30 °, ps3=bs3=10 °, b1=3mm, b2=2.5mm, R3=0.5mm, I1=0.2mm, I2=0.3mm.Tapering is 1/16 on the helical thread portion diametric(al).
Embodiment 2:177.8 * 9.19mm sleeve pipe
Pitch is 5.08mm, the outside thread tooth depth is 1.47mm, internal thread tooth depth 1.57mm, and internal thread tooth depth and pitch ratio are 0.31, differ 0.1mm between internal thread and the outside thread, when the engagement of internal thread and outside thread,, make to have gap I3=0.1mm with the outside thread tooth top at the bottom of the internal thread tooth because tooth depth there are differences, t2=3 ° at supporting plane angle, t1=10 ° at guide surface angle, chamfering R1=0.5mm, R2=0.8mm, ps1=bs1=0 °, ps2=45 °, ps3=bs3=14 °, b1=5mm, b2=3mm, R3=0.5mm, I1=0.4mm, I2=0.6mm.Tapering is 1/16 on the helical thread portion diametric(al).
Pipe screw joint of the present utility model is applicable to petroleum gas industrial oil pipe, sleeve pipe, can be used for high pressure oil wells and high-pressure gas well.Because the utility model reliable performance, difficulty of processing are little, can be used for all to the higher oil of sealing requirements, gas well, especially high pressure oil, gas well are more effective for high grade of steel and big wall thickness sleeve pipe in addition, have a extensive future.
Claims (9)
1. thread connector of petroleum gas industrial tube, having the box cupling that externally threaded body and end have internal thread by the end is formed by connecting, it is characterized in that, the outside thread of described body and the internal thread of box cupling are the buttress thread that cooperatively interacts, tooth depth is 0.25～0.35 with the ratio of pitch, the supporting plane angle is-15～3 °, and the guide surface angle is 10～50 °, has the gap between at the bottom of tooth top and the tooth after the thread engagement; Hermetic unit between whorl side facial canal body and box cupling is disposed with the first cylinder transition zone, cylindricality seal area, the second cylinder transition zone, cone seal district, conical surface transition district, and the tapering of described cone seal district two conical surfaces is identical; The end in described conical surface transition district is a torque shoulder.
2. thread connector of petroleum gas industrial tube according to claim 1, it is characterized in that, the hermetic unit of outside thread side is followed successively by the first exterior cylindrical transitional surface on the described body, the exterior cylindrical sealing surface, the second exterior cylindrical transitional surface, the external conical shape sealing surface, the external conical shape transitional surface, described external conical shape transitional surface is connected with outer torque shoulder face, the hermetic unit of internal thread side is followed successively by the first interior cylindrical face on the described box cupling, the second interior cylindrical face, the inner conical face, described inner conical face is connected with the internal torque circular bead surface, leave the gap between described first exterior cylindrical transitional surface and the described first interior cylindrical face and form the described first cylinder transition zone, form described cylindricality seal area by interference fit between described exterior cylindrical sealing surface and the described second interior cylindrical face, leave the gap between described second exterior cylindrical transitional surface and the described second interior cylindrical face and form described second transition zone, form described cone seal district by interference fit between described external conical shape sealing surface and the described inner conical face, leave the gap between described external conical shape transitional surface and the described inner conical face and form described conical surface transition district, described external conical shape sealing surface is identical with the taper angle of described inner conical face, and the angle of described outer torque shoulder face and internal torque circular bead surface and body axis normal face is respectively-30～0 °.
3. thread connector of petroleum gas industrial tube according to claim 1 and 2 is characterized in that, described cylindricality seal area is high interference, little seal length structure, and described cone seal district is low interference, big seal length structure.
4. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that, the radial interference amount of described cylindricality seal area is 0.3～1.5mm, and the seal length of cylindricality seal area is greater than half of pitch; The radial interference amount in described cone seal district is 0.1～0.5mm, and the seal length in cone seal district is 2～10mm.
5. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that, tapering is 1: 20～1: 10 on the helical thread portion diametric(al).
6. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that, the taper angle of described external conical shape transitional surface is 30～60 °.
7. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that all surface of discontinuity all adopt arc transition, and knuckle radius is 0.3～1mm.
8. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that, the gap length after the thread engagement between at the bottom of tooth top and the tooth is 0.05～0.2mm.
9. thread connector of petroleum gas industrial tube according to claim 3 is characterized in that, the taper angle of described external conical shape sealing surface and described inner conical face is 10～20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202506547U CN201818929U (en) | 2010-07-07 | 2010-07-07 | Threaded connector of pipe for oil and gas industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202506547U CN201818929U (en) | 2010-07-07 | 2010-07-07 | Threaded connector of pipe for oil and gas industry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201818929U true CN201818929U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202506547U Expired - Fee Related CN201818929U (en) | 2010-07-07 | 2010-07-07 | Threaded connector of pipe for oil and gas industry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201818929U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881139A (en) * | 2010-07-07 | 2010-11-10 | 天津天钢石油专用管制造有限公司 | Thread connector of petroleum gas industrial tube |
-
2010
- 2010-07-07 CN CN2010202506547U patent/CN201818929U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881139A (en) * | 2010-07-07 | 2010-11-10 | 天津天钢石油专用管制造有限公司 | Thread connector of petroleum gas industrial tube |
| CN101881139B (en) * | 2010-07-07 | 2015-07-08 | 天津天钢石油专用管制造有限公司 | Thread connector of petroleum gas industrial tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20110707 |