CN203640625U - Hook-type screwed joint - Google Patents
Hook-type screwed joint Download PDFInfo
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- CN203640625U CN203640625U CN201320850797.5U CN201320850797U CN203640625U CN 203640625 U CN203640625 U CN 203640625U CN 201320850797 U CN201320850797 U CN 201320850797U CN 203640625 U CN203640625 U CN 203640625U
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Abstract
The utility model provides a hook-type screwed joint, comprising an internal screwed member and external screwed members. Internal screw threads are processed on the internal screwed member while external screw threads are processed on the external screwed members. The internal screw threads and the external screw threads are engaged mutually for connection. The front end parts of the external screwed members are provided with torque shoulders which are propped against each other. After the joint is tightened, the torque shoulders are propped against each other tightly, thereby having a torsion resistant effect and enhancing the compression resistant capability of the joint at the same time. Screw teeth of the external screw threads incline towards the direction backing against the front end parts of the external screwed members and screw teeth of the internal screw threads incline towards the direction opposite to that of the external screw threads correspondingly,. Therefore, the screw threads are made to be hook-shaped and to be negative in bearing surface angle and positive in guiding surface angel, thereby having a certain sealing effect while being identical in processing difficulty level in comparison with API buttress screw threads. For different specifications, different screw pitches, tooth depths, and conical degrees can be arranged to enable the joint to be buckled easily even if the specification is relatively large.
Description
Technical field
The utility model relates to oil casing threaded link technique field, especially a kind of oil bushing threaded connector.
Background technology
Tubing and casing is the necessary oil country tubular good of recover petroleum and natural gas, and hundreds of root tubing and casing is threaded connection, and forms the tubing string that reaches thousands of meters, bears the task of recover petroleum and natural gas.Connecting thread mainly contains two kinds of forms at present, and one is API screw thread, and one is special thread.API screw thread is according to the thread forms of API standard production and use.This nipple is according to API standard manufacture, and technology maturation is processed easy to detectly, and cost is lower, is therefore applied widely.
After API screw thread is tightened, between the inner pipe end of box cupling and pipe end, having distance is the gap of M, sees accompanying drawing 1.Generally, M=25.4mm.The existence in this gap is to be determined by the structure of API screw thread.Due to the existence of machining tolerance, the position of tightening of different joints changes, in order to prevent that two external thread pieces that are screwed into box cupling two ends from contacting (after contact, tightening of one end can cause the loosening of the other end, thereby further affect the switching performance of joint), it is necessary that the buffer area that a distance is M is set.Due to the existence in this gap, while causing oil or natural gas to flow, produce turbulent flow in pipe, cause erosion corrosion.
Special threading connector has improved thread forms, has increased metal/metal hermetically-sealed construction, and its object is generally to improve sealing performance and the torsional property of joint.Such as, China Patent Publication No. is CN2575286Y, and in open day on September 24th, 2003, utility model name is called " oil bushing threaded connector ", and this patent discloses a kind of oil bushing threaded connector with good seal performance.This nipple is formed by connecting by screw thread 1 by external thread piece P and inner thread piece B.Be characterized in that external thread piece front end is provided with one column sealed, the correspondence position of inner thread piece is provided with a protruding sphere primary sealing area, and the two interference fit, seals.Meanwhile, external thread piece front end face is changed into-9 or-15 ° of angles, form interference fit with-9 or-15 ° of shoulders of inner thread piece.Like this, not only the bonding strength of joint, sealing performance are improved, and have also eliminated the gap existing between the inner pipe end of box cupling and pipe end simultaneously.But the processing request of special thread is high, be the patent of each producer, expensive, be not suitable for real estate oil field.Meanwhile, special thread cannot exchange completely with API screw thread, and inconvenient oil field is used.
Summary of the invention
For the deficiencies in the prior art, the utility model provides a kind of hook-type nipple, has eliminated between the inner pipe end of box cupling and pipe end and has had the gap of distance for M.This screw thread processing cost is far below special thread, suitable with API buttress thread.The technical solution adopted in the utility model is:
A kind of hook-type nipple, comprises inner thread piece and external thread piece, is processed with internal thread on inner thread piece, is processed with external screw thread on external thread piece, and internal thread and external screw thread intermesh, and plays connection function; The leading section of external thread piece is provided with the torque shoulder on mutual top, and joint is tightened rear torque shoulder and held out against mutually.
The leading section direction that externally threaded spiral shell teeth directional deviates from external thread piece tilts, and correspondingly, the spiral shell tooth incline direction of internal thread is contrary with externally threaded spiral shell tooth incline direction, makes screw thread be barb-shaped.
Further, the leading section of externally threaded spiral shell teeth directional external thread piece reduces gradually, and correspondingly, the spiral shell tooth of internal thread is raise to centre gradually by inner thread piece two ends.
Further, internal thread and external screw thread adopt same tapering Z, pitch P, tooth depth h, spigot surface angle α, bearing surface angle β.
Particularly, in the time that tube outer diameter is different, internal thread and external screw thread adopt same spigot surface angle α, α=20 °; According to the different size of tube outer diameter, different tapering Z, pitch P, tooth depth h and bearing surface angle β are set, concrete numerical value is as follows:
When 0.3≤OD≤114.3mm, Z=1/16, P=3.18mm, h=0.82mm, β=-4.2 °;
When 114.3<OD≤177.8mm, Z=1/16, P=5.08mm, h=1.27mm, β=-7 °;
When 177.8<OD≤339.7mm, Z=1/12, P=6.35mm, h=1.81mm, β=-9 °;
When 339.7<OD≤508.0mm, Z=1/12, P=8.47mm, h=2.20mm, β=-10 °;
OD represents tube outer diameter.
Compared with prior art, the utility model has marked improvement, is in particular in: 1) by the torque shoulder on mutual top is set, eliminated the gap existing between the inner pipe end of box cupling and pipe end, improved anti-twisting property and the resistance to compression of joint; 2) the partially trapezoidal joint of processing cost and common API is suitable, far below Special threading connector.
Brief description of the drawings
Fig. 1 is the API schematic diagram that is threaded in prior art.
Fig. 2 is joint design schematic diagram of the present utility model.
Fig. 3 is the screw thread schematic diagram of joint of the present utility model.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in Figure 2:
Hook-type nipple provided by the utility model, comprises inner thread piece 1 and external thread piece 3, is processed with internal thread 2 on inner thread piece 1, is processed with external screw thread 4 on external thread piece 3, and internal thread 2 and external screw thread 4 intermesh, and plays connection function; The leading section of external thread piece 3 is provided with the torque shoulder 5 on mutual top, and joint is tightened rear torque shoulder 5 and held out against mutually, plays antitorque effect, has also strengthened the resistance to compression of joint simultaneously.The leading section direction that the spiral shell teeth directional of external screw thread 4 deviates from external thread piece 3 tilts, and correspondingly, the spiral shell tooth incline direction of internal thread 2 is contrary with the spiral shell tooth incline direction of external screw thread 4, makes screw thread be barb-shaped.
And the leading section of the spiral shell teeth directional external thread piece 3 of external screw thread 4 reduces gradually, correspondingly, the spiral shell tooth of internal thread 2 is raise to centre gradually by inner thread piece 1 two ends, facilitates the stubborn of tubing and casing and box cupling to connect.
As shown in Figure 3, internal thread 2 and external screw thread 4 adopt same tapering Z, pitch P, tooth depth h, spigot surface angle α, bearing surface angle β.According to specification (tube outer diameter, with OD represent) difference, same screw thread spigot surface angle α is set, α=20 °.But according to specification (tube outer diameter, with OD represent) difference, different tapering Z, pitch P, tooth depth h and bearing surface angle β are set, concrete numerical value is as follows:
When 0.3≤OD≤114.3mm, Z=1/16, P=3.18mm, h=0.82mm, β=-4.2 °;
When 114.3<OD≤177.8mm, Z=1/16, P=5.08mm, h=1.27mm, β=-7 °;
When 177.8<OD≤339.7mm, Z=1/12, P=6.35mm, h=1.81mm, β=-9 °;
When 339.7<OD≤508.0mm, Z=1/12, P=8.47mm, h=2.20mm, β=-10 °;
Like this, screw thread spigot surface angle α is for just, and bearing surface angle β is for negative, and this screw thread is barb-shaped.This screw thread bearing surface angle is negative value, spigot surface angle be on the occasion of, be shaped as barb-shapedly, there is certain sealing function, difficulty of processing is suitable with API buttress thread.Corresponding different specification, arranges different pitch, tooth depth and tapering, makes the joint also can be than being easier to make-up in the time that specification is larger.
Embodiment mono-
First embodiment of the design is the oil pipe for Ф 88.9 × 6.45 mm, and grade of steel is P110.The external diameter of external thread piece 3 is 88.9 mm, and the external diameter of inner thread piece 1 is 108.0mm, and the length of inner thread piece 1 is 142.9mm.Thread pitch is 8 teeth/25.4mm(3.18mm), tapering 1:16, tooth depth 0.82mm, β=-4.2 °, bearing surface angle, α=20 °, spigot surface angle.This joint anti-twisting property reaches 1.5 times of common API joint, and sealability reaches 96.3MPa.
Embodiment bis-
Second embodiment of the design is the sleeve pipe for Ф 244.5 × 11.99 mm, and grade of steel is C95.The external diameter of external thread piece 3 is 244.5 mm, and the external diameter of inner thread piece 1 is 269.9mm, and the length of inner thread piece 1 is 269.9 mm.Thread pitch is 4 teeth/25.4mm(6.35mm), tapering 1:12, tooth depth 1.81mm, β=-9 °, bearing surface angle, α=20 °, spigot surface angle.This joint anti-twisting property reaches 1.5 times of common API joint, and sealability reaches 56.2MPa.
Claims (4)
1. a hook-type nipple, comprise inner thread piece (1) and external thread piece (3), it is characterized in that: on inner thread piece (1), be processed with internal thread (2), on external thread piece (3), be processed with external screw thread (4), internal thread (2) and external screw thread (4) intermesh, and play connection function; The leading section of external thread piece (3) is provided with the torque shoulder (5) on mutual top, and joint is tightened rear torque shoulder (5) and held out against mutually;
The leading section direction that the spiral shell teeth directional of external screw thread (4) deviates from external thread piece (3) tilts, correspondingly, the spiral shell tooth incline direction of internal thread (2) is contrary with the spiral shell tooth incline direction of external screw thread (4), makes screw thread be barb-shaped.
2. hook-type nipple as claimed in claim 1, is characterized in that:
The leading section of the spiral shell teeth directional external thread piece (3) of external screw thread (4) reduces gradually, and correspondingly, the spiral shell tooth of internal thread (2) is raise to centre gradually by inner thread piece (1) two ends.
3. hook-type nipple as claimed in claim 1 or 2, is characterized in that:
Internal thread (2) and external screw thread (4) adopt same tapering Z, pitch P, tooth depth h, spigot surface angle α, bearing surface angle β.
4. hook-type nipple as claimed in claim 3, is characterized in that: in the time that tube outer diameter is different, internal thread (2) and external screw thread (4) adopt same spigot surface angle α, α=20 °; According to the different size of tube outer diameter, different tapering Z, pitch P, tooth depth h and bearing surface angle β are set, concrete numerical value is as follows:
When 0.3≤OD≤114.3mm, Z=1/16, P=3.18mm, h=0.82mm, β=-4.2 °;
When 114.3<OD≤177.8mm, Z=1/16, P=5.08mm, h=1.27mm, β=-7 °;
When 177.8<OD≤339.7mm, Z=1/12, P=6.35mm, h=1.81mm, β=-9 °;
When 339.7<OD≤508.0mm, Z=1/12, P=8.47mm, h=2.20mm, β=-10 °;
OD represents tube outer diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320850797.5U CN203640625U (en) | 2013-12-23 | 2013-12-23 | Hook-type screwed joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320850797.5U CN203640625U (en) | 2013-12-23 | 2013-12-23 | Hook-type screwed joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203640625U true CN203640625U (en) | 2014-06-11 |
Family
ID=50871880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320850797.5U Expired - Fee Related CN203640625U (en) | 2013-12-23 | 2013-12-23 | Hook-type screwed joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203640625U (en) |
-
2013
- 2013-12-23 CN CN201320850797.5U patent/CN203640625U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20140611 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20140611 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20141223 |
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| EXPY | Termination of patent right or utility model |