CN2410411Y - Knuckle thread tooth type joint for oil well pipe - Google Patents
Knuckle thread tooth type joint for oil well pipe Download PDFInfo
- Publication number
- CN2410411Y CN2410411Y CN 99257576 CN99257576U CN2410411Y CN 2410411 Y CN2410411 Y CN 2410411Y CN 99257576 CN99257576 CN 99257576 CN 99257576 U CN99257576 U CN 99257576U CN 2410411 Y CN2410411 Y CN 2410411Y
- Authority
- CN
- China
- Prior art keywords
- tooth
- thread
- oil well
- profile
- flank
- 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 - Lifetime
Links
Abstract
The utility model discloses a round thread tooth-shaped joint for an oil well pipe, which is a tapered threaded joint. The utility model is composed of an external thread element and an internal thread element. A tooth top (3) and a tooth bottom (5) of a thread tooth shape are circular arcs, and an included angle between two contiguous lines which are contacted with the circular arcs of the tooth top (3) and the tooth bottom (5) is 60 DEG. The tooth shape is symmetric to a tooth middle line. A side tooth (4) of the tooth shape of at least one of the external thread element and the internal thread element is a convex smooth curve side tooth which is smoothly connected with the circular arcs of the tooth top (3) and the tooth bottom (5). The threaded joint has the advantages of easy machining and manufacture. The stress distribution state of the thread loading side tooth can be efficiently improved, the thread gluing can be solved, and the sealing property and the repeated use rate of the utility model are raised.
Description
The utility model relates to a kind of oil well pipe round thread profile of tooth joint, is a kind of tapered thread joint.
In the prior art, oil well pipe round thread profile of tooth joint is made up of external thread piece and inner thread piece two parts, and threaded portion is taper.Its thread tooth feature is, is circular-arc at the bottom of tooth top, the tooth, and flank is and the tangent straight line of circular arc at the bottom of tooth top, the tooth, and the angle between adjacent flank is 60 °, and profile of tooth is symmetrical in the tooth center line.This oil well pipe round thread profile of tooth joint is easy to processing and manufacturing.But because its profile of tooth load-side straight line flank stress distribution is inhomogeneous, concentrate producing stress near the straight line two ends at the bottom of tooth top and the tooth, therefore, ubiquity thread gluing situation in actual use, have a strong impact on its sealing, cause oil well pipe and pipe box cupling not to reuse.At present, adopt varying pitch, taper mutation, double thread surface to carry out measures such as immersion coating processing more, solve the thread gluing problem of oil well pipe round thread profile of tooth joint, complex process, processing difficulties.
The purpose of this utility model provides a kind of processing and manufacturing that is easy to, and can effectively improve the oil well pipe round thread profile of tooth joint of screw thread load-side flank stress distribution, to solve the thread gluing problem of this nipple, improves its sealing and repeat usage.
The purpose of this utility model realizes by following technical solution.
A kind of oil well pipe round thread profile of tooth joint, be the tapered thread joint, form by external thread piece and inner thread piece, the tooth top of thread tooth, be circular-arc at the bottom of the tooth, with tooth top, angle at the bottom of the tooth between the tangent adjacent straight line of circular arc is 60 °, profile of tooth is symmetrical in the tooth center line, the flank of at least one its profile of tooth is the smooth curve flank with the projection of circular arc smooth connection at the bottom of tooth top and the tooth in external thread piece and the inner thread piece, the flank of another its profile of tooth of part can be and the smooth curve flank of the projection of circular arc smooth connection at the bottom of tooth top and the tooth, also can be and tooth top, the tangent straight line flank of circular arc at the bottom of the tooth.
The curve flank is and all tangent circular curve of circular arc at the bottom of tooth top and the tooth that its curvature is 1/0.01～1/100.
The advantage that the utility model is compared with prior art had is: because the flank of thread tooth has adopted protruding smooth curve, show through finite element analysis, its load-side stress distribution is even, has eliminated existing oil well pipe round thread profile of tooth joint profile of tooth load-side flank stress concentration phenomenon.Solve the thread gluing problem that always perplexs the producer and user in the prior art, improved the sealing and the repeat usage of joint.Simultaneously, this thread tooth is easy to processing and manufacturing, only needs in existing process equipment, is equipped with one and can realizes molding cutter.
Introduce embodiment of the present utility model below in conjunction with accompanying drawing.
Fig. 1 is the structure chart of the utility model oil well pipe round thread profile of tooth joint
Fig. 2 is the zoomed-in view of thread tooth among Fig. 1.
The utility model oil well pipe round thread profile of tooth joint as shown in Figure 1, is the tapered thread joint, is made up of external thread piece 1 and inner thread piece 2, and external thread piece 1 is an end of a pipe, and inner thread piece 2 is ends of a pipe box cupling.Thread tooth as shown in Figure 2, the radius of curvature of tooth top 3 circular arcs is that the radius of curvature of 5 circular arcs is 0.5mm at the bottom of 0.356mm, the tooth.And the angle at the bottom of tooth top 3, the tooth between the tangent adjacent straight line of 5 circular arcs is 60 °, and profile of tooth is symmetrical in the tooth center line.The flank 4 of external thread piece 1 and inner thread piece 2 thread tooths all is and the tangent circular curve of 5 circular arcs at the bottom of its tooth top 3 and the tooth, and the radius of curvature of this circular curve is 45mm, and the effective height of thread tooth is 1.81mm.
In actual the use, when it is in running order when being subjected to axial tension, its screw thread load-side flank 4 stress distribution are even, thereby the thread gluing phenomenon seldom occurs, have good sealing effectiveness, and reusable.
Inner thread piece 2 in the utility model oil well pipe round thread profile of tooth joint also can be an end of another pipe.
Claims (2)
1. oil well pipe round thread profile of tooth joint, be the tapered thread joint, form by external thread piece and inner thread piece, the tooth top of thread tooth, be circular-arc at the bottom of the tooth, with tooth top, angle at the bottom of the tooth between the tangent adjacent straight line of circular arc is 60 °, profile of tooth is symmetrical in the tooth center line, it is characterized in that: the flank (4) of at least one its profile of tooth is the smooth curve flank with the projection of (5) circular arc smooth connection at the bottom of tooth top (3) and the tooth in external thread piece (1) and the inner thread piece (2), the flank of another its profile of tooth of part (4) can be and the smooth curve flank of the projection of (5) circular arc smooth connection at the bottom of tooth top (3) and the tooth, also can be and tooth top (3), the tangent straight line flank of (5) circular arc at the bottom of the tooth.
2. oil well pipe round thread profile of tooth joint according to claim 1 is characterized in that: described curve flank (4) is and the tangent circular curve of (5) circular arc at the bottom of tooth top (3) and the tooth that its curvature is 1/0.01～1/100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99257576 CN2410411Y (en) | 1999-12-29 | 1999-12-29 | Knuckle thread tooth type joint for oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99257576 CN2410411Y (en) | 1999-12-29 | 1999-12-29 | Knuckle thread tooth type joint for oil well pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2410411Y true CN2410411Y (en) | 2000-12-13 |
Family
ID=34040422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99257576 Expired - Lifetime CN2410411Y (en) | 1999-12-29 | 1999-12-29 | Knuckle thread tooth type joint for oil well pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2410411Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649935B (en) * | 2009-09-11 | 2012-05-30 | 广州立丰管道科技有限公司 | Circular arc thread dental pattern |
| US20170037944A1 (en) * | 2014-04-07 | 2017-02-09 | Igus Gmbh | Lead screw drive with asymmetrical internal and external thread and corresponding spindle nut |
-
1999
- 1999-12-29 CN CN 99257576 patent/CN2410411Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649935B (en) * | 2009-09-11 | 2012-05-30 | 广州立丰管道科技有限公司 | Circular arc thread dental pattern |
| US20170037944A1 (en) * | 2014-04-07 | 2017-02-09 | Igus Gmbh | Lead screw drive with asymmetrical internal and external thread and corresponding spindle nut |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
|
| CP03 | Change of name, title or address |
Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: Baoshan Iron & Steel Co., Ltd. Address before: 200122 circuit 370, Shanghai, Pudong New Area Patentee before: Baoshan Iron and Steel Group Co., Shanghai |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |