CN202832263U - Main sealing structure with double spherical faces on coupling face - Google Patents
Main sealing structure with double spherical faces on coupling face Download PDFInfo
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- CN202832263U CN202832263U CN 201220378585 CN201220378585U CN202832263U CN 202832263 U CN202832263 U CN 202832263U CN 201220378585 CN201220378585 CN 201220378585 CN 201220378585 U CN201220378585 U CN 201220378585U CN 202832263 U CN202832263 U CN 202832263U
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- box cupling
- spherical
- internal thread
- sealing
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Abstract
The utility model discloses a main sealing structure with double spherical faces on a coupling face and belongs to the field of special threaded joints in the petroleum industry. The main sealing structure with double spherical faces on the coupling face comprises an internal thread coupling sealing piece and an external thread sleeve sealing piece, wherein at least two spherical sealing surfaces are arranged between the contact surfaces of the internal thread coupling sealing piece and the external thread sleeve sealing piece. According to the utility model, the at least two spherical sealing surfaces are designed on the internal thread coupling sealing piece to seal the main sealing structure of a special threaded joint, the sealing surfaces can bear greater contact pressure; the area of the contact surfaces after bearing pressure is far larger than that of one spherical sealing surface, the contact pressure of a sealing part is reduced correspondingly, the probability of local yielding of the spherical faces during use can be lowered, and the seal reliability of the threaded joint can be improved.
Description
Technical field
The utility model relates to the petroleum industry Special threading connector, particularly the bispherical main seal structure of a kind of box cupling band.
Background technology
Petroleum industry is threaded connection the formation tubing string with tubing, because nipple is weak link, so the sealing reliability of nipple is the key that determines that can whole tubing string be on active service safely within projected life.In recent years, along with increasing of a large amount of harsh well exploitations such as deep-well, ultradeep well, directional well, horizontal well, traditional API(American Petroleum Institute, American Petroleum Institute (API)) round thread and buttress thread can not meet the demands, have the studied and exploitation of the Special threading connector of superperformance and are used in a large number.It is several that the primary sealing area form of present Special threading connector mainly contains the conical surface/conical surface, the conical surface/sphere, cylinder/sphere etc.
In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art: the conical surface/conical surface seal form contact area is large but contact is little, and the tapering of two sealing surfaces can make contact area greatly reduce when not mating, thereby affects its sealing effectiveness; The seal form of the conical surface/sphere and cylinder/sphere adopts a sphere to seal, but because existence and the sphere-contact area of fitting allowance are little, it is very large that sealing place contact can reach, and easily causes the sphere local yielding in the use, reduced the sealing reliability of nipple.
The utility model content
In order to solve the problem of prior art, the utility model embodiment provides a kind of box cupling band bispherical main seal structure.Described technical scheme is as follows:
The bispherical main seal structure of described box cupling band comprises internal thread box cupling seal and external thread sleeve seal; Have at least two spherical seal surfaces between the contact surface of described internal thread box cupling seal and external thread sleeve seal.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is:
At at least two spherical seal surfaces of internal thread box cupling seal design, carry out the sealing of Special threading connector main seal structure, sealing surface can bear larger contact, contact area after the pressure-bearing is compared a spherical seal surface and is also greatly improved, sealing place contact is corresponding to be reduced, cause the possibility of sphere local yielding to reduce in the use, the sealing reliability of nipple is improved.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic partial cross-sectional view of the bispherical main seal structure of box cupling band that provides of the utility model embodiment;
Fig. 2 is the schematic cross-section of internal thread box cupling seal among the utility model embodiment;
Fig. 3 is the schematic cross-section of external thread sleeve seal among the utility model embodiment.
Among the figure, 1: internal thread box cupling seal; 2: the external thread sleeve seal; 11: the first circular bead surfaces; 12: the first fillets; 13: the first spherical seal surfaces; 14: the second spherical seal surfaces; 15: escape; 21: the second circular bead surfaces; 22: the second fillets; 23: the conical surface.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail.
Fig. 1 shows the schematic partial cross-sectional view of the bispherical main seal structure of the present embodiment box cupling band, and Fig. 2 is the schematic cross-section of internal thread box cupling seal among Fig. 1, and Fig. 3 is the schematic cross-section of external thread sleeve seal among Fig. 1.Referring to figs. 1 through Fig. 3, the bispherical main seal structure of this box cupling band comprises internal thread box cupling seal 1 and external thread sleeve seal 2; Have at least two spherical seal surfaces between the contact surface of described internal thread box cupling seal 1 and external thread sleeve seal 2, the structure design of at least two spherical seal surfaces, can make that contacted sealing surface bears larger contact between internal thread box cupling seal 1 and the external thread sleeve seal 2, contact area after the pressure-bearing also than adopting a spherical seal surface greatly to improve, has improved the sealability of nipple sealing surface like this.
Wherein, the circular bead surface of described external thread sleeve seal 2, namely the second circular bead surface 21 is conflicted on the circular bead surface of described internal thread box cupling seal 1, namely on the first circular bead surface 11, realizes the close contact between described internal thread box cupling seal 1 and the described external thread sleeve seal 2.At least two described spherical seal surfaces are positioned on the internal face that links to each other with the first circular bead surface 11 of described internal thread box cupling seal 1, preferably spherical seal surface is set to two, the first spherical seal surface 13 as shown in Figure 2 and the second spherical seal surface 14, why two spherical seal surfaces are set, be when guaranteeing box cupling and sleeve pipe connection reliability, simplify the overall structure of hermetically-sealed construction.
Further, be set to greater than another spherical seal surface near the first spherical seal surface 13 spherical crown height of the first circular bead surface 11 of described internal thread box cupling seal 1, i.e. the spherical crown height of the second spherical seal surface 14, both differences are between 0 ~ 0.025mm.This structure setting can be so that the first spherical seal surface 13 contacts be large, and the second spherical seal surface 14 contact less, even bear that excessive load causes the surrender of the first spherical seal surface 13 and during the loss of seal ability at joint like this, the second spherical seal surface 14 still remains on regime of elastic deformation, thereby guarantee that joint can not leak, greatly strengthen the sealing reliability of nipple.And, the difference of two spherical seal surface spherical crown height can not be too large, avoid the first spherical seal surface 13 to contact with external thread sleeve seal 2 when realizing sealing, have the gap between the second spherical seal surface 14 and the external thread sleeve seal 2, do not have sealing function.
In the present embodiment, the second circular bead surface 21 of described external thread sleeve seal 2 parallels with the first circular bead surface 11 of described internal thread box cupling seal 1, can realize that the sealing of two circular bead surfaces is fitted; To be designated as reference plane perpendicular to the plane of the central axis of described internal thread box cupling seal 1 or external thread sleeve seal 2, described the first circular bead surface 11 or the second circular bead surface 21 become 0 ~ 20 ° of angle setting with described reference plane, so that the mutual slippage of Shi Buhui that is tightly connected between described internal thread box cupling seal 1 and the external thread sleeve seal 2.
In the present embodiment, when the difference of the first spherical seal surface 13 spherical crown height and the second spherical seal surface 14 spherical crown height is 0, be set to cylinder with the outside wall surface of described the first spherical seal surface 13 and the second spherical seal surface 14 contacted described external thread sleeve seals 2; When above-mentioned difference is not 0, described outside wall surface is set to the conical surface shown in Figure 3 23, because only have this moment the conical surface 23 to contact with the summit of the first spherical seal surface 13 and the second spherical seal surface 14 simultaneously, improve sealing, if be set to the words of cylinder, cylinder then can only contact with the first spherical seal surface 13, and can not contact with the second spherical seal surface 14, has reduced its sealing.And, in order to improve the sealing performance between described internal thread box cupling seal 1 and the external thread sleeve seal 2, be connected by the first fillet 12 between the first circular bead surface 11 of described internal thread box cupling seal 1 and the inner wall surface thereof, be connected by the second fillet 22 between the second circular bead surface 21 of described external thread sleeve seal 2 and its outside wall surface; Also show the escape 15 on described internal thread box cupling seal 1 internal face among Fig. 2, escape 15 is to need to offer for described internal thread box cupling seal 1 processing.
Above-mentioned the first spherical seal surface 13 and the second spherical seal surface 14 all design on described internal thread box cupling seal 1 internal face, can avoid the ball face sealing face to be subject to outside damage, prolong parts application life.
Above-mentioned the utility model embodiment sequence number does not represent the quality of embodiment just to description.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. the bispherical main seal structure of box cupling band comprises internal thread box cupling seal (1) and external thread sleeve seal (2); It is characterized in that having at least two spherical seal surfaces between the contact surface of described internal thread box cupling seal (1) and external thread sleeve seal (2).
2. the bispherical main seal structure of box cupling band according to claim 1 is characterized in that, the circular bead surface of described external thread sleeve seal (2) is conflicted on the circular bead surface of described internal thread box cupling seal (1).
3. the bispherical main seal structure of box cupling band according to claim 2 is characterized in that, at least two described spherical seal surfaces are positioned on the internal face that links to each other with the circular bead surface of described internal thread box cupling seal (1).
4. the bispherical main seal structure of box cupling band according to claim 3 is characterized in that, described spherical seal surface has two.
5. the bispherical main seal structure of box cupling band according to claim 4 is characterized in that, the spherical seal surface spherical crown height of the circular bead surface of close described internal thread box cupling seal (1) is greater than another spherical seal surface spherical crown height.
6. the bispherical main seal structure of box cupling band according to claim 5 is characterized in that, two described spherical seal surface spherical crown height differ 0 ~ 0.025mm.
7. the bispherical main seal structure of box cupling band according to claim 2 is characterized in that, the circular bead surface of described external thread sleeve seal (2) parallels with the circular bead surface of described internal thread box cupling seal (1).
8. the bispherical main seal structure of box cupling band according to claim 7, it is characterized in that, plane perpendicular to the central axis of described internal thread box cupling seal (1) or external thread sleeve seal (2) is designated as reference plane, and described circular bead surface becomes 0 ~ 20 ° of angle with described reference plane.
9. the bispherical main seal structure of box cupling band according to claim 3 is characterized in that, with the outside wall surface of the contacted described external thread sleeve seal of described spherical seal surface (2) be the conical surface or cylinder.
10. the bispherical main seal structure of box cupling band according to claim 9, it is characterized in that, be connected by fillet respectively between the circular bead surface of described internal thread box cupling seal (1) and the inner wall surface thereof and between the circular bead surface of described external thread sleeve seal (2) and its outside wall surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220378585 CN202832263U (en) | 2012-07-31 | 2012-07-31 | Main sealing structure with double spherical faces on coupling face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220378585 CN202832263U (en) | 2012-07-31 | 2012-07-31 | Main sealing structure with double spherical faces on coupling face |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202832263U true CN202832263U (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220378585 Expired - Fee Related CN202832263U (en) | 2012-07-31 | 2012-07-31 | Main sealing structure with double spherical faces on coupling face |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202832263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373057A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Gas seal threaded connector casing pipe for low-pressure gas field horizontal well |
-
2012
- 2012-07-31 CN CN 201220378585 patent/CN202832263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373057A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Gas seal threaded connector casing pipe for low-pressure gas field horizontal well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20210731 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |