CN2763469Y - Thread gluing resisting air-tighting casing joint - Google Patents
Thread gluing resisting air-tighting casing joint Download PDFInfo
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- CN2763469Y CN2763469Y CN 200520038929 CN200520038929U CN2763469Y CN 2763469 Y CN2763469 Y CN 2763469Y CN 200520038929 CN200520038929 CN 200520038929 CN 200520038929 U CN200520038929 U CN 200520038929U CN 2763469 Y CN2763469 Y CN 2763469Y
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Abstract
The utility model relates to a thread gluing resisting air-tighting casing joint of the technical field of a machine project. The utility model comprises a connection hoop and a pipe body, wherein the connection hoop comprises an inner thread, a sealing structure of an inner conical surface and an inner torque table shoulder; the pipe body comprises an outer thread, a sealing structure of an outer conical surface and outer torque table shoulder. The outer thread and the inner thread, the sealing structure of an outer conical surface and the sealing structure of an inner conical surface, and the outer torque table shoulder and the inner torque table shoulder are all matched in an interference mode. The thread distance of the outer thread is a standard thread distance of which the length is 5.08 mm. The height of the outer thread is in a range of 1.375-1.475 mm. The utility model has the advantages of high connection strength, favorable sealing performance and thread gluing resisting performance. The utility model can extend the service life of a casing. The utility model is suitable for middle pressure natural gas wells and high pressure natural gas wells.
Description
Technical field
The utility model relates to a kind of union of mechanical engineering technical field, specifically, is a kind of hermetic seal casing joint of sticking-resistant.
Background technology
At present the widely used API casing thread connection in oil field belongs to standard component, it possess skills maturation, detect easily, advantage such as cost is lower, still, this joint is aspect sealing performance, especially there is serious defective in the gas sealing ability aspect.There is bigger gap because tighten between the internal and external screw thread of back structure design aspect, API joint, forms leakage path, make that the gas sealing ability of this joint is very low.
Find by prior art documents, the Chinese patent publication number is CN 2549162Y, open day is on May 7th, 2003, the utility model name is called: the petroleum casing pipe air-tight seal screw joint, this patent readme is: a kind of petroleum casing pipe air-tight seal screw joint, the box thread that comprises box cupling, the male thread of cannula tip, box thread and male thread cooperatively interact, it is characterized in that described box cupling two-end structure is for being symmetrical arranged, the box thread of each end is to be made of buttress thread, there is interior sealing cone in its place ahead, and the end of sealing cone is processed with the internal torque shoulder in box cupling, and the screw thread of each end is connected with sealing cone by escape; There is the external seal conical surface in male thread the place ahead of described cannula tip, torque shoulder outside its end is processed with, and the interior sealing cone of box cupling and internal torque shoulder contact with the external seal conical surface and the outer torque shoulder of petroleum casing pipe end.Simultaneously, the outer torque shoulder of box cupling internal torque shoulder and sleeve pipe is wedge shape.The tapering of the sealing cone and the sleeve pipe external seal conical surface is 1: 10 in the box cupling.
Its weak point is: above-mentioned joint is not being taken measures aspect the optimization screw thread stress distribution, it is very inhomogeneous that joint is tightened the stress distribution of rear thread, there is relatively serious stress concentration phenomenon, make joint that thread gluing in use take place easily, influenced the functional performance of joint, comprise sealing performance, also be unfavorable for prolonging simultaneously the application life of sleeve pipe.
Summary of the invention
The purpose of this utility model is to overcome deficiency of the prior art, and a kind of hermetic seal casing joint of sticking-resistant is provided, and makes it have excellent sealing performance and sticking-resistant performance, prolongs the application life of sleeve pipe.
The utility model is to realize by following technical scheme, and the utility model comprises box cupling and body.Wherein, box cupling comprises internal thread, inner conical surface hermetically-sealed construction and internal torque shoulder, and body comprises external screw thread, male cone (strobilus masculinus) hermetically-sealed construction and outer torque shoulder.External screw thread and internal thread, male cone (strobilus masculinus) hermetically-sealed construction and inner conical surface hermetically-sealed construction, outer torque shoulder and internal torque shoulder are interference fit.Wherein, male cone (strobilus masculinus) hermetically-sealed construction and inner conical surface hermetically-sealed construction are primary seal, and outer torque shoulder and internal torque shoulder are auxiliary seal, and screw thread interference simultaneously also plays certain sealing function, thereby has realized multi-sealed.
Behind the button, have the stress concentration phenomenon at the two ends of thread engagement in the casing joint, concentrate in order to overcome stress, increase the fit clearance of two ends thread engagement, reduce the peak stress of screw fit, the utility model has been taked following measure:
Describedly externally threadedly be shaped as trapezoidally partially, its pitch is standard pitch 5.08mm, and its height is in 1.375～1.475mm scope.
The shape of described internal thread is also for trapezoidal partially, it highly is calibrated altitude 1.575mm, one section internal thread near coupling face, its length is 2～4 pitch, its pitch is in 5.10～5.20mm scope, and near one section internal thread of internal torque shoulder, its length is 2～4 pitch, its pitch is in 4.97～5.06mm scope, and the pitch of middle one section internal thread equals 5.08mm.
During the utility model work, box cupling and body are twisted and are connected together, at this moment, the external screw thread of processing on the internal thread of processing on the box cupling, inner conical surface hermetically-sealed construction, internal torque shoulder and the body, the external seal conical surface, outer torque shoulder closely cooperate, respectively in diametric(al) and axially formation interference, produce certain contact pressure, thereby play good hermetic seal effect.Simultaneously, owing to internal thread, external screw thread all are trapezoidal partially, this efficient height that is threaded is as long as the ridge number that guarantees engagement just can make the bonding strength of joint and body suitable greater than certain numerical value.For common casing joint, after joint was tightened, several pitch threads at engagement two ends can produce very big stress and concentrate, and this just makes the screw thread at this position that bonding takes place easily and damages, influence the application life of joint, even influenced the performance of joint bonding strength and sealing performance.Keeping externally threaded pitch is standard pitch (5.08mm), and with several pitch thread appropriate change pitch at internal thread two ends, can obviously reduce stress and concentrate.
The beneficial effects of the utility model are: (1) external screw thread pitch is standard pitch, internal thread adopts the method for segmentation varying pitch, internal and external threads is cooperated after, can significantly reduce the peak stress at joint two ends, reduce stress and concentrate, thereby avoid in the joint use thread gluing taking place.(2) the internal and external screw thread tooth depth is slightly variant, can reduce and go up the thread compound pressure that produces in the button process, helps improving the sealing performance of joint.
Description of drawings
Fig. 1 is the utility model structural representation
The specific embodiment
As shown in Figure 1, the utility model comprises: box cupling 1, body 5.Wherein, box cupling 1 comprises internal thread 2, inner conical surface hermetically-sealed construction 3, internal torque shoulder 4, and body 5 comprises external screw thread 6, male cone (strobilus masculinus) hermetically-sealed construction 7, outer torque shoulder 8.External screw thread 6 is interference fit with inner conical surface hermetically-sealed construction 3, outer torque shoulder 8 with internal torque shoulder 4 with internal thread 2, male cone (strobilus masculinus) hermetically-sealed construction 7.
Being shaped as of described external screw thread 6 is trapezoidal partially, and its pitch is standard pitch 5.08mm, and its height is in 1.375～1.475mm scope.
Being shaped as of described internal thread 2 is trapezoidal partially, it highly is calibrated altitude 1.575mm, one section internal thread 2 near coupling face, its length is 2～4 pitch, its pitch is in 5.10～5.20mm scope, and near one section internal thread 2 of internal torque shoulder 4, its length is 2～4 pitch, its pitch is in 4.97～5.06mm scope, and the pitch of middle one section internal thread 2 equals 5.08mm.
Claims (2)
1, a kind of hermetic seal casing joint of sticking-resistant, comprise: box cupling (1), body (5), wherein box cupling (1) comprises internal thread (2), inner conical surface hermetically-sealed construction (3), internal torque shoulder (4), body (5) comprises external screw thread (6), male cone (strobilus masculinus) hermetically-sealed construction (7), outer torque shoulder (8), external screw thread (6) and internal thread (2), male cone (strobilus masculinus) hermetically-sealed construction (7) and inner conical surface hermetically-sealed construction (3), outer torque shoulder (8) is an interference fit with internal torque shoulder (4), it is characterized in that, the pitch of described external screw thread (6) is standard pitch 5.08mm, and its height is in 1.375～1.475mm scope.
2, the hermetic seal casing joint of sticking-resistant according to claim 1, it is characterized in that, the height of described internal thread (2) is calibrated altitude 1.575mm, near one section internal thread (2) of coupling face, its length is 2～4 pitch, and its pitch is in 5.10～5.20mm scope, one section internal thread (2) near internal torque shoulder (4), its length is 2～4 pitch, and its pitch is in 4.97～5.06mm scope, and the pitch of middle one section internal thread (2) equals 5.08mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520038929 CN2763469Y (en) | 2005-01-13 | 2005-01-13 | Thread gluing resisting air-tighting casing joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520038929 CN2763469Y (en) | 2005-01-13 | 2005-01-13 | Thread gluing resisting air-tighting casing joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2763469Y true CN2763469Y (en) | 2006-03-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520038929 Expired - Fee Related CN2763469Y (en) | 2005-01-13 | 2005-01-13 | Thread gluing resisting air-tighting casing joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2763469Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696621B (en) * | 2009-11-04 | 2012-05-16 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN102678064A (en) * | 2011-11-09 | 2012-09-19 | 中国石油天然气集团公司 | Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing |
| CN101680275B (en) * | 2007-04-05 | 2014-05-28 | Tracto技术有限责任两合公司 | Rod coupling comprising a pin |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
-
2005
- 2005-01-13 CN CN 200520038929 patent/CN2763469Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101680275B (en) * | 2007-04-05 | 2014-05-28 | Tracto技术有限责任两合公司 | Rod coupling comprising a pin |
| CN101696621B (en) * | 2009-11-04 | 2012-05-16 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN102678064A (en) * | 2011-11-09 | 2012-09-19 | 中国石油天然气集团公司 | Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing |
| CN102678064B (en) * | 2011-11-09 | 2015-09-09 | 中国石油天然气集团公司 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
| WO2015089897A1 (en) * | 2013-12-18 | 2015-06-25 | 宝山钢铁股份有限公司 | Airtight casing joint |
| EA031841B1 (en) * | 2013-12-18 | 2019-02-28 | Баошань Айрон Энд Стил Ко., Лтд. | Airtight casing joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |