CN203702015U - Gas sealconnecting structure for oil well pipe - Google Patents
Gas sealconnecting structure for oil well pipe Download PDFInfo
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- CN203702015U CN203702015U CN201320540237.XU CN201320540237U CN203702015U CN 203702015 U CN203702015 U CN 203702015U CN 201320540237 U CN201320540237 U CN 201320540237U CN 203702015 U CN203702015 U CN 203702015U
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- oil well
- sealing area
- well pipe
- primary sealing
- air
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Abstract
Agas sealconnecting structure for an oil well pipe comprises a thread structure and a sealing surface structure which are matched between a pipe body and a coupling, wherein a thread of the pipe body is an external thread and a buttress thread; a thread of the coupling is an internal thread and a buttress thread; a sealing surface of the pipe body comprises an outer main sealing surface, a first outer auxiliary sealing surface and a second outer auxiliary sealing surface on one end side of one end of the pipe body; a sealing surface of thecoupling comprises an inner main sealing surface corresponding to the outer main sealing surface of the pipe body and an inner auxiliary sealing surface corresponding to the first outer auxiliary sealing surface of the pipe body; the angle of a bearing surface of the pipe body is in a range of -1 degree to -10 degrees; the angle of a bearing surface of the coupling is in a range of-1 degree 2 minutes to -12 degrees 30 minutes; the angle of a guiding surface of the pipe body is in a range of 5 degrees to 15 degrees; the angle of a guiding surface of the coupling is in a range of5 degrees 2 minutes to 17 degrees 30 minutes; after the threads of the pipe body and the coupling are screwed together, the threads of the negative-angle bearing surfaces, the first outer auxiliary sealing surface and the inner main sealing surface form a wedge-shaped structure together. According to the structure, the thread connection is completely equal to the pipe body in strength, level IV test and evaluation of ISO13697 are passed, andthecompressionefficiency reaches 100%.
Description
Technical field
The utility model relates to oil well pipe technology, particularly a kind of air-tight seal connecting structure for oil well pipe.
Background technology
Along with the development of petroleum industry, exploitation difficulty is more and more higher, and API screw thread can not meet the performance requirements such as oil well pipe gas tightness that oil field double thread connects, bonding strength, anti-corrosion capability.With regard to Tarim Basin three surpasses gas well, because the effects such as larger stretching, compression, interior pressure are born in operation with oil well pipe, the oil well pipe application risk of general special type of attachment is also very large.Therefore, the special thread type of attachment that needs exploitation to adapt, to adapt to mining requirement.
Existing oil well pipe thread type of attachment, screw thread bearing surface is take positive-angle as main, and the bearing surface angle of male and female head is in full accord.Male and female screw thread does not adapt to the gap design of the operating modes such as stretching, compression.There is no sealing surface, or sealing surface structure is two-part.
Summary of the invention
The purpose of this utility model is to design a kind of air-tight seal connecting structure for oil well pipe, can guarantee to be threaded and 100% reach strong with body etc., while being included in various loads such as bearing stretching, compression, interior pressure, external pressure, reaching in combined load under the condition of 100% body design strength, can not lose efficacy in joint junction; China is first by the IV level test assessment of ISO13697, and compression efficiency reaches 100%.
For achieving the above object, the technical solution of the utility model is:
For an air-tight seal connecting structure for oil well pipe, it is characterized in that, comprise the helicitic texture and the sealing surface structure that between body and box cupling, coordinate; Described body screw thread is external screw thread, buttress thread; Described box cupling screw thread is internal thread, buttress thread; The second outer auxiliary seal face that the sealing surface of described body comprises the distolateral outer primary sealing area in body end, is connected, is positioned at the first outer auxiliary seal face of end face, is connected with outer primary sealing area opposite side with outer primary sealing area one side; The sealing surface of described box cupling comprises the interior primary sealing area of the external primary sealing area of respective tube, the interior auxiliary seal face of the outer auxiliary seal face of corresponding body first; Described body bearing surface angle is between-1 °～-10 °, and box cupling bearing surface angle is between-1 ° of 2'～-12 ° 30'; Described body guide surface angle is between 5 °～15 °, and box cupling guide surface angle is between 5 ° of 2'～17 ° 30'; After body and box cupling screw thread are twisted and connect, screw thread, the first outer auxiliary seal face and the interior primary sealing area of negative angle bearing surface form wedge structure jointly.
Further, the tooth depth of the screw thread of described body, box cupling is 1～3mm, pitch 3～6mm, thread taper 2%～12%;
Described body screw thread and box cupling screw thread have the gap of 0.1～0.5mm in short transverse, have 0.05～0.35mm gap on width.Be the tooth depth that the tooth depth of described body screw thread is less than box cupling screw thread, between 0.1～0.5mm.The facewidth of described body screw thread is than box cupling thread width, and gap is 0.05～0.35mm.
In addition, the circular arc cooperation that body screw thread described in the utility model contacts with box cupling thread tooth all leaves gap, and gap length is 0.001～1mm.
The outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
The outer primary sealing area of described body and axis angle are between 20 °-45 °, and the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
Having, be arc transition, and two arc radius is identical, are 0.2～1.0mm between first, second outer auxiliary seal face of body described in the utility model and outer primary sealing area again.
The utility model connects by the body with external screw thread and sealing surface and forms with the box cupling of internal thread and sealing surface.Wherein, body screw thread is partially trapezoidal, sealing surface three-stage structure; Box cupling screw thread is buttress thread, and sealing surface is two-stage structure.After body, box cupling screw thread are twisted and connect, the screw thread of negative angle bearing surface, the first outer auxiliary seal face, interior primary sealing area be common forms highly stable wedge structure, and firmly primary sealing area effect increases the reliability of sealing.
The utility model body, box cupling screw thread are: screw thread tooth depth scope 1-3mm, pitch scope 3～6mm, thread taper scope 2%～12%; The tooth depth of body screw thread is less than box cupling tooth depth, leaves the radial clearance of 0.1～0.5mm, in order to store more thread compound, reduces to twist connecing rear thread fat and assemble the harmful stress bringing.
The facewidth of body screw thread, than box cupling thread width, except storing thread compound, considers that screw thread needs guide surface sooner, more to bear compressive load while bearing compression, alleviates the impact for sealing surface, and end play is between 0.05～0.35mm.
The circular arc cooperation of profile of tooth contact all leaves gap, between 0.001～1mm, promotes the flexibility of screw thread under the load ons such as bending.
Bearing surface angle is between-1 °～-10 °, box cupling screw thread bearing surface negative angle is more smaller than body screw thread bearing surface negative angle simultaneously, scope is between-1 ° of 2'～-12 ° 30', this angular deviation can be in the time stretching the laminating completely of self-assembling formation face and face, form reliable contact, guarantee hot strength.
Guide surface angle is between 5 °～15 °, and simultaneously box cupling screw thread guide surface angle is more bigger than body screw thread, and scope, between 5 ° of 2'～17 ° 30', guarantees the laminating completely of self-assembling formation face and face in the time of compression (while comprising bending), guarantees that contact reliably.
Three sections of sealing surfaces of the utility model body are all the conical surfaces, and outer primary sealing area plays main sealing function, and the first outer auxiliary seal face plays auxiliary seal, and control torque effect; In overall structure, play wedge shape stabilization with negative angle screw thread.
First, second outer auxiliary seal face has arc transition with outer primary sealing area respectively, and two arc radius are identical, makes primary sealing area on microcosmic, keep balance, can make stress be evenly distributed.
And the second outer auxiliary seal face that is tapering can promote the sealing effectiveness of the outer primary sealing area under bending.
The utility model is compared with 02209453.9 disclosed joint with Chinese patent 200820144761.4:
The screw thread that the utility model structural bearing face is negative angle and one combination of auxiliary seal face have formed wedge shape rock-steady structure on integrated connection, have solidified the effect of primary sealing area.And above-mentioned two patent bearing surfaces are positive-angle, cannot form the utility model effect structure.
The threaded portion of the utility model structure, except bearing surface negative angle, locates all gapped requirements for tooth top, flank, circular arc etc., and according to the difference of effect, the requirement of tooth top and backlash is not identical yet.Different with above-mentioned two patents.
The screw thread of the utility model structure, has deviation for the angle of body and box cupling bearing surface, also has deviation for the angle of body and box cupling guide surface, forms and connects preferably effect.Different with above-mentioned two patents.
The body sealing surface of the utility model structure is syllogic, has increased counter-bending effect, and above-mentioned two patents are two-parts, and the utility model structure is different with above-mentioned two patents.
The primary sealing area of the utility model structure is consistent with other two sections of auxiliary seal face designed arc-shaped appearances, forms the balance sysmte that is similar to spring, different with above-mentioned two patents.
Compared with the joint of the utility model and Chinese patent 201110205192.6: this patent is a kind of screw thread, and the utility model structure is a kind of screw thread of wedge shape effect and type of attachment of sealing surface combination of forming on the whole.
The tooth top of the screw thread of the utility model structure, flank, arc transition all leave gap, and according to the difference of effect, the requirement of tooth top and backlash is not identical yet, has further promoted incompressible, resistant to bending ability.This patent tooth top leaves radial clearance, and all the other all contact.
The body screw thread of the utility model structure and the bearing surface angle of box cupling screw thread have deviation, are drawing high lifting connection effect under state.Different with this patent.
The body screw thread of the utility model structure and the guide surface angle of box cupling screw thread have deviation, promote and connect effect under compressive state.Different with this patent.
The utility model is domestic first by the A system in the test of ISO13679 IV level and the test of B system.
The utility model has the advantage of:
1. the bearing surface negative angle differentiation of body and box cupling screw thread design, while guaranteeing to stretch, bearing surface is stressed evenly, promotes screw thread stretch-proof safety factor.
2. the guide surface differential seat angle alienation of body and box cupling screw thread designs, and guarantees the good contact of guide surface when screw thread bears compression (while comprising bending), promotes incompressible, the resistant to bending safety factor of screw thread.
3. two of body auxiliary seal faces have arc transition with primary sealing area respectively, and two arc radius are consistent, and identical circular arc makes primary sealing area stress balance on microcosmic, can make stress be evenly distributed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the schematic diagram of the utility model embodiment middle tube body and box cupling screw thread bearing surface and sealing surface formation wedge structure.
Fig. 3 is the structural representation of the utility model embodiment middle tube body end.
Fig. 4 is the bearing surface of the utility model embodiment middle tube body and box cupling screw thread, the structural representation that guide surface coordinates.
The specific embodiment
Referring to Fig. 1～Fig. 4, the air-tight seal connecting structure for oil well pipe of the present utility model, it comprises the helicitic texture and the sealing surface structure that between body 1 and box cupling 2, coordinate; Described body 1 screw thread is external screw thread, buttress thread; Described box cupling 2 screw threads are internal thread, buttress thread; The second outer auxiliary seal face 13 that the sealing surface of described body 1 comprises the distolateral outer primary sealing area 11 in body end, is connected, is positioned at the first outer auxiliary seal face 12 of end face, is connected with outer primary sealing area 11 opposite sides with outer primary sealing area 11 1 sides; The sealing surface of described box cupling 2 comprises the interior primary sealing area 21 of the external primary sealing area 11 of respective tube, the interior auxiliary seal face 22 of the outer auxiliary seal face 12 of corresponding body first; Described body screw thread 1 bearing surface 15 angles are between-1 °～-10 °, and box cupling 2 screw thread bearing surface 23 angles are between-1 ° of 2'～-12 ° 30'; Described body screw thread 1 guide surface 14 angles are between 5 °～15 °, and box cupling 2 screw thread guide surface 24 angles are between 5 ° of 2'～17 ° 30'; After body 1 screw thread and box cupling 2 screw threads are twisted and connect, the screw thread of negative angle bearing surface 15,23, the first outer auxiliary seal face 12 form wedge structure A jointly with corresponding interior auxiliary seal face 22.
Further, the tooth depth of described body 1 screw thread, box cupling 2 screw threads is 1～3mm, pitch 3～6mm, thread taper 2%～12%; The tooth depth of body screw thread is less than the tooth depth of box cupling screw thread.
Referring to Fig. 4, described body 1 screw thread and box cupling 2 screw threads in height have the gap B of 0.1～0.5mm, have the clearance C of 0.05～0.35mm on width.
The circular arc cooperation that body 1 screw thread described in the utility model contacts with the profile of tooth of box cupling 2 screw threads all leaves clearance D, and clearance D size is 0.001～1mm.
The outer primary sealing area 11 of described body 1 and first, second outer auxiliary seal face 12,13 are the conical surface.
The outer primary sealing area 11 of described body 1 and axis angle are between 20 °-45 °, and the first outer auxiliary seal face 12 and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face 13 and axis is between 2 °-15 °.
Referring to Fig. 3, between body 1 first, second outer auxiliary seal face 12,13 described in the utility model and outer primary sealing area 11, be arc transition, and two circular arc r1, r2 radius are identical.Described arc radius is 0.2～1.0mm.
The utility model designs by said structure, guarantee to be threaded and 100% reached strong with body etc., while being included in various loads such as bearing stretching, compression, interior pressure, external pressure, reaching under the condition of 100% body design strength in combined load, can not lose efficacy in joint junction.
Claims (29)
1. for an air-tight seal connecting structure for oil well pipe, it is characterized in that, comprise the helicitic texture and the sealing surface structure that between body and box cupling, coordinate;
Described body screw thread is external screw thread, buttress thread; Described box cupling screw thread is internal thread, buttress thread;
The second outer auxiliary seal face that the sealing surface of described body comprises the distolateral outer primary sealing area in body end, is connected, is positioned at the first outer auxiliary seal face of end face, is connected with outer primary sealing area opposite side with outer primary sealing area one side;
The sealing surface of described box cupling comprises the interior primary sealing area of the external primary sealing area of respective tube, the interior auxiliary seal face of the outer auxiliary seal face of corresponding body first;
Described body bearing surface angle is between-1 °～-10 °, and box cupling bearing surface angle is between-1 ° of 2'～-12 ° 30';
Described body guide surface angle is between 5 °～15 °, and box cupling guide surface angle is between 5 ° of 2'～17 ° 30'; After body and box cupling screw thread are twisted and connect, screw thread, the first outer auxiliary seal face and the interior primary sealing area of negative angle bearing surface form wedge structure jointly.
2. the air-tight seal connecting structure for oil well pipe as claimed in claim 1, is characterized in that, the tooth depth of described body, the screw thread of box cupling is 1～3mm, pitch 3～6mm, thread taper 2%～12%; The tooth depth of body screw thread is less than the tooth depth of box cupling screw thread.
3. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that, described body screw thread and box cupling screw thread have the gap of 0.1～0.5mm in short transverse, have 0.05～0.35mm gap on width.
4. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that, the circular arc cooperation that described body screw thread contacts with the profile of tooth of box cupling screw thread all leaves gap, and gap length is 0.001～1mm.
5. the air-tight seal connecting structure for oil well pipe as claimed in claim 3, is characterized in that, the circular arc cooperation that described body screw thread contacts with the profile of tooth of box cupling screw thread all leaves gap, and gap length is 0.001～1mm.
6. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that, the outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
7. the air-tight seal connecting structure for oil well pipe as claimed in claim 3, is characterized in that, the outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
8. the air-tight seal connecting structure for oil well pipe as claimed in claim 4, is characterized in that, the outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
9. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
10. the air-tight seal connecting structure for oil well pipe as claimed in claim 3, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
11. air-tight seal connecting structures for oil well pipe as claimed in claim 4, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
12. air-tight seal connecting structures for oil well pipe as claimed in claim 5, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
13. air-tight seal connecting structures for oil well pipe as claimed in claim 6, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
14. air-tight seal connecting structures for oil well pipe as claimed in claim 7, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
15. air-tight seal connecting structures for oil well pipe as claimed in claim 8, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
16. air-tight seal connecting structures for oil well pipe as claimed in claim 1 or 2, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
17. air-tight seal connecting structures for oil well pipe as claimed in claim 3, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
18. air-tight seal connecting structures for oil well pipe as claimed in claim 4, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
19. air-tight seal connecting structures for oil well pipe as claimed in claim 5, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
20. air-tight seal connecting structures for oil well pipe as claimed in claim 6, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
21. air-tight seal connecting structures for oil well pipe as claimed in claim 7, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
22. air-tight seal connecting structures for oil well pipe as claimed in claim 8, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
23. air-tight seal connecting structures for oil well pipe as claimed in claim 9, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
24. air-tight seal connecting structures for oil well pipe as claimed in claim 10, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
25. air-tight seal connecting structures for oil well pipe as claimed in claim 11, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
26. air-tight seal connecting structures for oil well pipe as claimed in claim 12, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
27. air-tight seal connecting structures for oil well pipe as claimed in claim 13, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
28. air-tight seal connecting structures for oil well pipe as claimed in claim 14, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
29. air-tight seal connecting structures for oil well pipe as claimed in claim 15, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540237.XU CN203702015U (en) | 2013-08-30 | 2013-08-30 | Gas sealconnecting structure for oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540237.XU CN203702015U (en) | 2013-08-30 | 2013-08-30 | Gas sealconnecting structure for oil well pipe |
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| Publication Number | Publication Date |
|---|---|
| CN203702015U true CN203702015U (en) | 2014-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201320540237.XU Expired - Lifetime CN203702015U (en) | 2013-08-30 | 2013-08-30 | Gas sealconnecting structure for oil well pipe |
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| CN (1) | CN203702015U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN109505531A (en) * | 2018-12-26 | 2019-03-22 | 中国石油天然气集团有限公司 | A kind of threaded collar joint |
| CN109715322A (en) * | 2016-09-29 | 2019-05-03 | 京瓷株式会社 | The manufacturing method of cutting element and the machined object using the cutting element |
| CN110359858A (en) * | 2018-03-26 | 2019-10-22 | 中国石油天然气集团有限公司 | The design and manufacturing method, encapsulating method of the sealing structure of oil-well pipe joint |
| CN114320996A (en) * | 2021-11-25 | 2022-04-12 | 洛阳双瑞特种装备有限公司 | Energy-saving type special-shaped opening ring and centrifugal pump gap sealing structure |
-
2013
- 2013-08-30 CN CN201320540237.XU patent/CN203702015U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN103422819B (en) * | 2013-08-30 | 2016-12-07 | 宝山钢铁股份有限公司 | A kind of air-tight seal connecting structure for oil well pipe |
| CN109715322A (en) * | 2016-09-29 | 2019-05-03 | 京瓷株式会社 | The manufacturing method of cutting element and the machined object using the cutting element |
| CN109715322B (en) * | 2016-09-29 | 2020-10-02 | 京瓷株式会社 | Cutting tool and method for manufacturing cut product using same |
| CN110359858A (en) * | 2018-03-26 | 2019-10-22 | 中国石油天然气集团有限公司 | The design and manufacturing method, encapsulating method of the sealing structure of oil-well pipe joint |
| CN110359858B (en) * | 2018-03-26 | 2020-09-04 | 中国石油天然气集团有限公司 | Design and manufacturing method of sealing structure of oil well pipe joint and sealing method |
| CN109505531A (en) * | 2018-12-26 | 2019-03-22 | 中国石油天然气集团有限公司 | A kind of threaded collar joint |
| CN109505531B (en) * | 2018-12-26 | 2020-09-04 | 中国石油天然气集团有限公司 | Threaded coupling |
| CN114320996A (en) * | 2021-11-25 | 2022-04-12 | 洛阳双瑞特种装备有限公司 | Energy-saving type special-shaped opening ring and centrifugal pump gap sealing structure |
| CN114320996B (en) * | 2021-11-25 | 2024-05-24 | 中船双瑞(洛阳)特种装备股份有限公司 | Energy-saving special-shaped mouth ring and centrifugal pump gap sealing structure |
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| C14 | Grant of patent or utility model | ||
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