CN202578548U - Special knuckle threaded pipe joint - Google Patents
Special knuckle threaded pipe joint Download PDFInfo
- Publication number
- CN202578548U CN202578548U CN 201220119296 CN201220119296U CN202578548U CN 202578548 U CN202578548 U CN 202578548U CN 201220119296 CN201220119296 CN 201220119296 CN 201220119296 U CN201220119296 U CN 201220119296U CN 202578548 U CN202578548 U CN 202578548U
- Authority
- CN
- China
- Prior art keywords
- face
- tooth
- chamfering
- circular arc
- screw thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model relates to a special knuckle threaded pipe joint, which includes a coupling and a pipe body that are connected through threads, wherein the form of the thread is a special knuckle thread with an arc addendum and an arc root, and the guiding flank angle thereof is different from the bearing flank angle thereof; a middle cylindrical surface is arranged at the middle part of the inner wall of the coupling, metal sealing structures are arranged between the two end surfaces of the middle cylindrical surface and the end part of the pipe body respectively, and the metal sealing structure includes an inner sealing surface and an outer sealing surface; the inner sealing surface includes an inner conical chamfer surface, an inner conical surface and a transitional surface between the end surface of the middle cylindrical surface and the inner thread end part of the coupling, and the end surface of the middle cylindrical surface is inclined outward to form an inner end surface chamfer; and the outer sealing surface includes an outer conical surface and the outer conical chamfer surface on the outer wall of the end part of the pipe body, and the end surface of the end part of the pipe body is inclined inward to form an outer end surface chamfer. By adopting the asymmetric special knuckle threads and the metal sealing structure, the special knuckle threaded pipe joint has the advantages of high strength, excellent sealing performance, and high anti-torque and anti-bending performance.
Description
Technical field
The utility model relates to the oil well pipe thread joint that is applied to petroleum industry, specifically a kind of special round thread union.
Background technology
Tubing and casing in the oil well pipe industry mainly is to couple together through nipple, forms oil casing, and length reaches thousands of rice, the requirement of strength, the sealing performance that connect of nipple wherein, the having relatively high expectations of each side such as tensile load and torque resistant performance.
At present, the structure that existing tubing and casing round thread connects all is API (American Petroleum Institute (API)) standard round screw thread basically, technological comparative maturity, but result of use is not ideal enough.The sealing surface poor performance of this standard round nipple a little less than the counter-bending ability, often causes revealing at screw connection point, quality accident such as fracture, slippage.
Summary of the invention
The utility model provides a kind of special round thread union to the problems referred to above, and this joint bonding strength is high, good seal performance, and counter-bending ability is strong, and it is good to go into to detain performance.
Technical scheme according to the utility model: a kind of special round thread union; Comprise box cupling and body through being threaded; The tooth form of said screw thread is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth; Its spigot surface tooth side angle is 40 ° ~ 50 °, and its bearing surface tooth side angle is 1 ° ~ 5 °, and its tapering is 1:8 ~ 1:20; The axial middle part of said box cupling inwall is provided with the middle cylinder of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of both ends of the surface and the said body of cylinder in the middle of said, said shape metallic leak-proof structure comprises and is arranged on the inner sealing surface on the said box cupling and is arranged on the external seal face on the said body; Said inner sealing surface comprises female cone fillet surface, internal conical surface and the transition conical surface that is arranged between said middle cylinder end face and the said box cupling internal threaded end, and the end face of said middle cylinder is formed slopely the inner face chamfering to the outside; Said external seal face comprises outer conical surface and the outer cone fillet surface that is arranged on the outer wall of said body end, and the end face of said body end slopes inwardly and forms the outer face chamfering.
The value of said inner face chamfering is 10 ° ~ 35 °, and said outer face chamfering is littler 0 ~ 2 ° than the value of said inner face chamfering; The female cone chamfering of said female cone fillet surface is 10 ° ~ 30 °, and the outer cone chamfering of said outer cone fillet surface is littler 0 ~ 2 ° than said female cone chamfering.
The tapering of said internal conical surface is identical with the tapering of said screw thread, and the tapering of the said transition conical surface is provided with the inner face circular arc greater than the tapering of said screw thread between the end face of said middle cylinder and the said female cone fillet surface; The tapering of said outer conical surface is identical with the tapering of said screw thread, and the surface of said outer conical surface is lower than element of cone at the bottom of the tooth of said screw thread, is provided with the outer face circular arc between said outer face chamfering and the said outer cone fillet surface.
The radius of said inner face circular arc is 0.2 ~ 1mm, the big 0 ~ 0.5mm of radius of the said inner face circular arc of radius ratio of said outer face circular arc.
The outer conical surface length of said external seal face is 5 ~ 20mm, and the length of said inner sealing surface is than the long half pitch of length of said outer conical surface; The length of said outer cone fillet surface is 2 ~ 6mm, the equal in length of the length of said female cone fillet surface and said outer cone fillet surface.
The thickness of said inner sealing surface is 3 ~ 10mm, and the thickness of said external seal face equates with the thickness of said inner sealing surface.
The inwall of said body end is provided with inner cylinder face, and said inner cylinder face links to each other with the endoporus of said body through the transition conical surface.
The length of said inner cylinder face is 0 ~ 20mm, and the length of said transition plane is 0 ~ 15mm.
The pitch of said screw thread is 6.5 tooth/inches ~ 4 tooth/inches, and its tooth form tooth depth is 1.5 ~ 2. 5mm.
The radius of circular arc and tooth top circular arc is 0.20 ~ 1.0mm at the bottom of the tooth of said screw thread.
The technique effect of the utility model is: the utility model adopts asymmetrical special round thread, and the spigot surface tooth side angle of tooth form is bigger than standard round screw thread, screw thread to go into to detain performance good, when machine is tight, be difficult for thread alternating; The bearing surface tooth side angle of tooth form forms barb, has improved the bonding strength of screw thread, has increased the tooth form sealing performance, has improved the counter-bending ability of joint simultaneously, and its anti-leakage performance is increased greatly; Between box cupling and body, increased a shape metallic leak-proof structure, made it after interference fit, can effectively improve torque resistant performance and sealing performance.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of the utility model after decomposing.
Fig. 3 is the form of thread figure in the utility model.
Fig. 4 is the enlarged drawing of the inner sealing surface in the utility model.
Fig. 5 is the enlarged drawing of the external seal face in the utility model.
The specific embodiment
Be further described below in conjunction with the specific embodiment of accompanying drawing the utility model.
Among Fig. 1 ~ Fig. 5, comprise circular arc 8 at the bottom of box cupling 1, body 2, body 3, screw thread 4, tooth form tooth depth 5, spigot surface tooth side angle 6, bearing surface tooth side angle 7, the tooth, tooth top circular arc 9, tapering 10, pitch 11, tooth form angle 12, outer conical surface 13, inner sealing surface length 14, external seal face thickness 15, inner sealing surface thickness 16, outer face circular arc 17, inner face circular arc 18, outer face chamfering 19, inner face chamfering 20, inner cylinder face 21, the transition conical surface 22, internal conical surface 23, the transition conical surface 24, inner sealing surface 25, external seal face 26, middle line 27, interior stepped hole cylinder 28, middle cylinder 29, female cone fillet surface 30, outer cone fillet surface 31, female cone chamfering 32, outer cone chamfering 33 etc.
Like Fig. 1, shown in Figure 2, the utility model is a kind of special round thread union, comprises the box cupling 1 and the body 2,3 that connect through screw thread 4.Box cupling 1 and body 2 are be that benchmark closely cooperates with virtual middle line 27, reach body 2 and body 3 through box cupling 1 carry out somely being connected to form oil, casing string satisfies oil gas field production instructions for use.
The tooth form of the screw thread 4 in the utility model is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth, is changed into the asymmetric tooth form of deflection bearing surface by the tooth form of symmetry.As shown in Figure 3, the spigot surface tooth side angle 6 of screw thread 4 is 40 ° ~ 50 °, and its bearing surface tooth side angle 7 is 1 ° ~ 5 °, and the scope at tooth form angle 12 is the poor of spigot surface tooth side angle 6 and bearing surface tooth side angle 7.
The tapering 10 of screw thread 4 is 1:8 ~ 1:20; Pitch 11 is 6.5 tooth/inches ~ 4 tooth/inches (25.4 mm); Tooth form tooth depth 5 is 1.5 ~ 2.5mm.
The radius of circular arc 8 and tooth top circular arc 9 is 0.20 ~ 1.0mm at the bottom of the tooth of screw thread 4.
Referring to Fig. 1 and Fig. 2, be provided with the middle cylinder 29 of ring-type at the axial middle part of box cupling 1 inwall again, be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of middle cylinder 29 and body 2,3.Shape metallic leak-proof structure comprises the inner sealing surface 25 that is arranged on the box cupling 1 and is arranged on the external seal face 26 on the body 2,3.
As shown in Figure 4, inner sealing surface 25 comprises female cone fillet surface 30, internal conical surface 23 and the transition conical surface 24 that is arranged between middle cylinder 29 end faces and box cupling 1 internal threaded end.The tapering of internal conical surface 23 is identical with the tapering of screw thread 4, and the tapering of the transition conical surface 24 is greater than the tapering of screw thread 4, seamlessly transits simultaneously externally to reach it that sealing surface 26 plays guide effect.The female cone chamfering 32 of female cone fillet surface 30 is that the end face of cylinder 29 is formed slopely inner face chamfering 20 to the outside in the middle of 10 ° ~ 30 °, and the value of inner face chamfering 20 is 10 ° ~ 35 °.Be provided with inner face circular arc 18 between the end face of middle cylinder 29 and the female cone fillet surface 30, the radius of inner face circular arc 18 is 0.2 ~ 1mm.The length 14 of inner sealing surface 25 is than the long half pitch 11 of length of outer conical surface 13, and the length of female cone fillet surface 30 is 2 ~ 6mm, and internal conical surface 23 length are 5 ~ 15mm, and the length of the transition conical surface 24 is 2 ~ 10mm, and the thickness 16 of inner sealing surface 25 is 3 ~ 10mm.
As shown in Figure 5, external seal face 26 comprises outer conical surface 13 and the outer cone fillet surface 31 that is arranged on body 2, the 3 end outer walls.The tapering of outer conical surface 13 is identical with the tapering of screw thread 4, and the surface of outer conical surface 13 is lower than element of cone at the bottom of the tooth of screw thread 4, so just can not cause its surface touching internal thread tooth top, and its size Control is at 0.5 ~ 1.5mm.The outer cone chamfering 33 of outer cone fillet surface 31 is littler 0 ~ 2 ° than female cone chamfering 32.The end face of body 2,3 ends slopes inwardly and forms outer face chamfering 19; Outer face chamfering 19 is littler 0 ~ 2 ° than the value of inner face chamfering 20, can satisfy repeatedly machine like this and twist and to connect its contact surface of back and still form interference fit and play sealing function and play high torque resistant effect simultaneously.Be provided with outer face circular arc 17 between outer face chamfering 19 and the outer conical surface 13, the big 0 ~ 2mm of radius of the radius ratio inner face circular arc 18 of outer face circular arc 17 can satisfy repeatedly machine like this and twist and to connect its contact surface of back and still form interference fit and play sealing function.Outer conical surface 13 length of external seal face 26 are 5 ~ 20mm, and the thickness 15 of external seal face 26 equates with the thickness 16 of inner sealing surface 25.The inwall of body end is provided with inner cylinder face 21, and inner cylinder face 21 links to each other with the endoporus of body through the transition conical surface 22.The length of inner cylinder face 21 is 0 ~ 20mm, and the length of transition plane 22 is 0 ~ 15mm.The length of inner cylinder face 21 and transition plane 22 can be stipulated according to body 2,3 wall thickness amounts, makes it after closely cooperating, can keep same cylinder to seamlessly transit with interior stepped hole cylinder 28 and gets final product.
The utility model when operation, earlier the external screw thread of body 2 is put into earlier and carried out machine behind internal thread 3 ~ 7 buttons of box cupling 1 and twist and connect.Because spigot surface tooth side angle 6 gradients are bigger, be lowered to button in action of gravity when putting button and be very easy to, can not cause internal thread tooth top and external screw thread tooth top top button, cause the tight phenomenon of thread alternating machine.Box cupling 1 has inner sealing surface 25; Twist when machine and to have bigger torque resistant effect after taking over that being full of screws and cooperating; The tight position of machine and torque can be made separate stipulations according to the tight identical or technical papers of deduction on the API standard round screw thread, but must satisfy closely cooperating of inner sealing surface 25 and external seal face 26 and internal and external threads 4.Same fastening method; Is that benchmark closely cooperate with body 3 with virtual middle line 27 with box cupling 1; Reach body 2 and body 3 through box cupling 1 carry out somely being connected to form oil, casing string satisfies oil gas field production instructions for use, when going into the well in the oil field its connector machine stressed joint is one by one formed thousands of meters oil casing.
The utility model adopts asymmetrical special round thread, and the spigot surface tooth side angle of tooth form is bigger than standard round screw thread, screw thread to go into to detain performance good, when machine is tight, be difficult for thread alternating; The bearing surface tooth side angle of tooth form forms barb, has improved the bonding strength of screw thread, has increased the tooth form sealing performance, has improved the counter-bending ability of joint simultaneously, and its anti-leakage performance is increased greatly; Between box cupling and body, increased a shape metallic leak-proof structure, made it after interference fit, can effectively improve torque resistant performance and sealing performance, the hermetically-sealed construction end face has increased a fillet surface, the guiding transitional function when having improved the sealing surface interference fit; Increase the overall length of box cupling, improved the counter-bending ability of joint.
The utility model processing is simple and convenient, and the scope of application is wide, and is safe and reliable; Can bear the complicated power of extraneous high strength and apply and do not reveal or damage, satisfy the instructions for use in oil field.
Claims (10)
1. special round thread union; Comprise the box cupling (1) and the body (2,3) that connect through screw thread (4); It is characterized in that: the tooth form of said screw thread (4) is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth; Its spigot surface tooth side angle (6) is 40 ° ~ 50 °, and its bearing surface tooth side angle (7) is 1 ° ~ 5 °, and its tapering (10) is 1:8 ~ 1:20; The axial middle part of said box cupling (1) inwall is provided with the middle cylinder (29) of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of cylinder (29) and said body (2,3) in the middle of said, said shape metallic leak-proof structure comprises the inner sealing surface (25) that is arranged on the said box cupling (1) and is arranged on the external seal face (26) on the said body (2,3); Said inner sealing surface (25) comprises female cone fillet surface (30), internal conical surface (23) and the transition conical surface (24) that is arranged between said middle cylinder (29) end face and said box cupling (1) internal threaded end, and the end face of said middle cylinder (29) is formed slopely inner face chamfering (20) to the outside; Said external seal face (26) comprises outer conical surface (13) and the outer cone fillet surface (31) that is arranged on said body (2,3) the end outer wall, and the end face of said body (2,3) end slopes inwardly and forms outer face chamfering (19).
2. according to the described special round thread union of claim 1, it is characterized in that: the value of said inner face chamfering (20) is 10 ° ~ 35 °, and said outer face chamfering (19) is littler 0 ~ 2 ° than the value of said inner face chamfering (20); The female cone chamfering (32) of said female cone fillet surface (30) is 10 ° ~ 30 °, and the outer cone chamfering (33) of said outer cone fillet surface (31) is littler 0 ~ 2 ° than said female cone chamfering (32).
3. according to the described special round thread union of claim 1; It is characterized in that: the tapering of said internal conical surface (23) is identical with the tapering of said screw thread (4); The tapering of the said transition conical surface (24) is provided with inner face circular arc (18) greater than the tapering of said screw thread (4) between the end face of said middle cylinder (29) and the said female cone fillet surface (30); The tapering of said outer conical surface (13) is identical with the tapering of said screw thread (4); And the surface of said outer conical surface (13) is lower than element of cone at the bottom of the tooth of said screw thread (4), is provided with outer face circular arc (17) between said outer face chamfering (19) and the said outer cone fillet surface (31).
4. according to the described special round thread union of claim 3, it is characterized in that: the radius of said inner face circular arc (18) is 0.2 ~ 1mm, the big 0 ~ 0.5mm of radius of the said inner face circular arc of the radius ratio of said outer face circular arc (17) (18).
5. according to the described special round thread union of claim 1; It is characterized in that: outer conical surface (13) length of said external seal face (26) is 5 ~ 20mm, and the length (14) of said inner sealing surface (25) is than the long half pitch (11) of length of said outer conical surface (13); The length of said outer cone fillet surface (31) is 2 ~ 6mm, the equal in length of the length of said female cone fillet surface (30) and said outer cone fillet surface (31).
6. according to the described special round thread union of claim 1, it is characterized in that: the thickness (16) of said inner sealing surface (25) is 3 ~ 10mm, and the thickness (15) of said external seal face (26) equates with the thickness (16) of said inner sealing surface (25).
7. according to the described special round thread union of claim 1; It is characterized in that: the inwall of said body (2,3) end is provided with inner cylinder face (21), and said inner cylinder face (21) links to each other through the endoporus of the transition conical surface (22) with said body (2,3).
8. according to the described special round thread union of claim 7, it is characterized in that: the length of said inner cylinder face (21) is 0 ~ 20mm, and the length of said transition plane (22) is 0 ~ 15mm.
9. according to the described special round thread union of claim 1, it is characterized in that: the pitch (11) of said screw thread (4) is 6.5 tooth/inches ~ 4 tooth/inches, and its tooth form tooth depth (5) is 1.5 ~ 2. 5mm.
10. according to claim 1 or 9 described special round thread unions, it is characterized in that: the radius of circular arc (8) and tooth top circular arc (9) is 0.20 ~ 1.0mm at the bottom of the tooth of said screw thread (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220119296 CN202578548U (en) | 2012-03-27 | 2012-03-27 | Special knuckle threaded pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220119296 CN202578548U (en) | 2012-03-27 | 2012-03-27 | Special knuckle threaded pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202578548U true CN202578548U (en) | 2012-12-05 |
Family
ID=47247969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220119296 Expired - Fee Related CN202578548U (en) | 2012-03-27 | 2012-03-27 | Special knuckle threaded pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202578548U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587844A (en) * | 2012-03-27 | 2012-07-18 | 无锡西姆莱斯石油专用管制造有限公司 | Special round thread pipe coupling |
| CN103556956A (en) * | 2013-11-01 | 2014-02-05 | 南通永大管业股份有限公司 | Self-adaptive screw thread structure for high sealing performance oil pipe |
-
2012
- 2012-03-27 CN CN 201220119296 patent/CN202578548U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587844A (en) * | 2012-03-27 | 2012-07-18 | 无锡西姆莱斯石油专用管制造有限公司 | Special round thread pipe coupling |
| CN102587844B (en) * | 2012-03-27 | 2015-04-15 | 无锡西姆莱斯石油专用管制造有限公司 | Special round thread pipe coupling |
| CN103556956A (en) * | 2013-11-01 | 2014-02-05 | 南通永大管业股份有限公司 | Self-adaptive screw thread structure for high sealing performance oil pipe |
| CN103556956B (en) * | 2013-11-01 | 2015-11-25 | 南通永大管业股份有限公司 | A kind of self adaptation helicitic texture of high leakproofness oil pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202946041U (en) | Zigzag air-sealed oil well pipe thread joint structure | |
| CN202673174U (en) | High seal special buttress thread pipe connector | |
| CN102678071A (en) | High-airtightness special buttress thread sleeve connection joint | |
| CN102678065B (en) | The special buttress thread union of high sealability | |
| CN202578555U (en) | Special buttress thread oil casing joint | |
| CN103362450B (en) | Non-coupling multi-sealing tooth-width-variable wedge type threaded oil well pipe structure | |
| CN202578548U (en) | Special knuckle threaded pipe joint | |
| CN202673178U (en) | High-sealing buttress threaded conduit connecting joint | |
| CN102852466A (en) | Special buttress thread oil sleeve connecting joint | |
| CN202578549U (en) | Special knuckle-thread high anti-torque oil sleeve tube connector | |
| CN202578552U (en) | Connecting joint with special knuckle threads for oil casing | |
| CN102606086A (en) | Connecting joint with special knuckle threads for oil casing | |
| CN102587842A (en) | Special round thread highly-torque-resistant pipe coupling | |
| CN103362455B (en) | Bending-resistant high-sealing variable-tooth-width wedge type coupling structure and oil well pipe structure | |
| CN202578545U (en) | High-resistance torque tube joint with special knuckle threads | |
| CN202673175U (en) | High seal special buttress thread sleeve pipe connector | |
| CN102587844B (en) | Special round thread pipe coupling | |
| CN102852468B (en) | High-sealing special circular thread oil sleeve connection connector | |
| CN202483470U (en) | Special-round-thread joint for oil casing pipes | |
| CN202578554U (en) | Special buttress thread oil sleeve connection joint | |
| CN103362459A (en) | Arc-shaped conical surface sealed variable tooth wide wedge-type coupling structure and oil well pipe structure | |
| CN202673177U (en) | High sealing partial trapezoidal thread casing pipe connector | |
| CN103321587B (en) | Plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and oil well pipe structure | |
| CN102587843A (en) | Special round thread highly-torque-resistant oil casing coupling | |
| CN102852469B (en) | Special buttress thread oil sleeve joint |
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: 20121205 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20121205 |
|
| 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: 20121205 Termination date: 20180327 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |