CN106764164B - A kind of insulating joint - Google Patents
A kind of insulating joint Download PDFInfo
- Publication number
- CN106764164B CN106764164B CN201710209419.1A CN201710209419A CN106764164B CN 106764164 B CN106764164 B CN 106764164B CN 201710209419 A CN201710209419 A CN 201710209419A CN 106764164 B CN106764164 B CN 106764164B
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- China
- Prior art keywords
- pipe body
- joint pipe
- insulating
- locking nut
- screw thread
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/02—Electrically insulating joints or couplings
- F16L25/021—Electrically insulating joints or couplings for screw-threaded joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
The present invention relates to a kind of insulating joints, the first joint pipe body and the second joint pipe body including insulation two pressure pipelines of connection, the first joint pipe body other end is equipped with external screw thread and internal plug seat, insulated enclosure retaining ring is equipped in internal plug seat, second joint pipe body one end periphery wall sliding sleeve is equipped with insulating component and locking nut, insulating component is set between locking nut inner wall and the second joint pipe body periphery wall and is positioned by positioning member and fixed, locking nut one end is equipped with internal screw thread and is threadedly coupled with external screw thread, and the locking nut other end is equipped with the first inner conical surface；When the internal screw thread is connect with external screw thread, internal plug seat is inserted into first inner conical surface pushing tow insulating component and second joint pipe body one end, pass through insulated enclosure retaining ring insulated enclosure between second joint pipe body, one end face and internal plug seat sagittal plane, it insulate between second joint pipe body one end periphery wall and internal plug seat axial face and by insulating component between second joint pipe body one end periphery wall, the first joint pipe body other end and the first inner conical surface.
Description
Technical field
The present invention relates to pipe-line wrapping accessory technical field, more particularly to it is a kind of for instrument system pipeline, it is reliable
The high small-sized insulating joint of property.
Background technique
Instrument system pipeline is generally by the components structure such as all kinds of measuring instruments, transmitter, instrument valve, pipe connecting piece
At wherein measuring instrument, transmitter belong to electronic component, and needing to be powered can work；In system pipeline operational process,
There is the risk leaked electricity in various degree in all kinds of electronic components.System pipes in fields such as petroleum, chemical industry, natural gas, electric power
Lu Zhong is usually inflammable and explosive medium, if there are a large amount of electrostatic or pipeline to leak electricity in system pipeline at this time, then may be made
At perils such as on fire, explosions, cause economic loss and personnel safety accident.
Insulating joint, for also acting as the function of protection pipe-line system, main function while connecting system pipeline
Be by the measuring instrument of instrument system pipeline between pipeline, equipment be isolated with mutually insulated between pipeline, block because electric leakage causes
Electric current conduction, main line buildup of static electricity is avoided, to avoid instrument system pipeline security risk.
In actual use, insulating joint not only has the requirement being dielectrically separated from instrument system pipeline, should also have close
The requirement of envelope and intensity.Existing insulating joint, insulation function is usually realized by non-metal insulating material, thus is caused
It is sealed and Intensity Design is difficult, poor reliability；Instrumentation pipeline insulating joint currently on the market, although the structure letter having
It is single, but its sealability and structural strength are poor, and structure is designed very complicated to guarantee performance by some, but its technology difficulty
Greatly, it or even to cause maintenance difficulty big using special process such as welding or can not repair, economy is low.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide, a kind of design is reasonable, and structure is simple, technology difficulty
Small, good airproof performance has high-intensitive and high reliability insulating joint.
To achieve the above object, the invention adopts the following technical scheme:
A kind of insulating joint, is applied to insulation two pressure pipelines of connection, and the insulating joint includes the first joint pipe body
With the second joint pipe body, first joint pipe body one end and the second joint pipe body other end are separately connected two pressure pipelines,
The first joint pipe body other end is equipped with external screw thread and internal plug seat, is equipped with insulated enclosure retaining ring, the second joint pipe body one in internal plug seat
Sliding sleeve on periphery wall is held to be equipped with insulating component and locking nut, insulating component is set to locking nut inner wall and the second joint pipe body
Between periphery wall, and by a positioning member positioning and fixing, locking nut one end is equipped with internal screw thread and is threadedly coupled with external screw thread, locks
The tight nut other end is equipped with the first inner conical surface compatible with insulating component；When the internal screw thread is threadedly coupled with external screw thread, the
Internal plug seat, one end face of the second joint pipe body and interpolation aperture are inserted into one inner conical surface pushing tow insulating component and second joint pipe body one end
It insulate and seals by insulated enclosure retaining ring between face, lead between second joint pipe body one end periphery wall and internal plug seat axial face
Cross the insulation of insulating component one end, and the sealing of the sealing ring by being equipped with, second joint pipe body one end periphery wall, the first joint pipe body
It is insulated between other end and the first inner conical surface of locking nut by insulating component.
The insulating component includes dead ring and insulation sleeve, and the dead ring is L shape, and dead ring one end is for being inserted into interpolation
Hole, one sagittal plane of the dead ring other end are taper, insulation sleeve for being against the first joint pipe body other end, the insulation sleeve
One end is equipped with axially-extending portion for being resisted against the dead ring other end, the insulation sleeve other end；The internal screw thread and external screw thread spiral shell
When line connects, locking nut drives insulation sleeve sliding, and insulation sleeve one end is resisted against the dead ring other end, and pushing tow dead ring one end
It is inserted into internal plug seat, axially-extending portion stretches out the insulation locking nut other end with the locking nut other end and the second junction block of insulating
The insulation of body one end periphery wall.The design of the dead ring while making it have insulation, buffer action, also has transmitting coupling mechanism force
With the effect of positioning, and make itself and insulation sleeve one end fits, plays the impurity such as the extraneous metallic particles of prevention, dust and enter insulation connecing
Cause structural damage in head or forms conductive path；The design of insulation sleeve extension allows to avoid locking nut another
Cause conductive path because impurity is accumulated between one end and the second joint pipe body periphery wall.
The internal plug seat inlet of first joint pipe body is equipped with 60 ° of chamfering structures, described dead ring one end and dead ring
The outer wall junction of the other end is equipped with transition face compatible with the chamfering structure.The design enables dead ring to connect with first
Head tube body other end and internal plug seat entrance are contacted in half package status, so that during locking nut is constantly tightened, absolutely
Edge ring one end can be gradually pressed between second joint pipe body one end periphery wall and internal plug seat axial face, play insulating effect,
And generate good axially and radially positioning action.
The positioning member includes support conical ring and elastic spring, and the elastic spring is embedded in second joint pipe body one end
In the circlip groove that periphery wall is equipped with, the support conical ring is slidably located on second joint pipe body one end periphery wall, for embedding
It sets supports insulative and covers one end inner wall, support conical ring one end is equipped with interior locating slot；When the internal screw thread is threadedly coupled with external screw thread, lock
Tight nut drives insulation sleeve and support conical ring sliding, and interior positioning fluted shaft is located at outside elastic spring to surface cover, interior locating slot sagittal plane
It is against on elastic spring.
Second joint pipe body one end periphery wall is equipped with mating surface compatible with dead ring one end inner wall.
Second joint pipe body one end periphery wall is equipped with the seal groove for installing sealing ring.
Described dead ring one end inner wall is equipped with third inner conical surface；The third inner conical surface and shaft centre line of the dead ring at
30 ° of angles.When the design is so that locking nut assembly is locked in the first joint pipe body, good positioning and fastening can be generated
Effect.
First inner conical surface cone angle degree of the locking nut is 40 °；The first outer cone face cone that the cone of support is equipped with
The the second male cone (strobilus masculinus) cone angle degree and the second inner conical surface degree that angle number, insulation sleeve one end are equipped with the first of locking nut in
Conical surface cone angle degree is identical.The design can ensure that active force when locking uniformly is directed toward axis center, to improve insulation
The stability of joint structure.
The contact surface of described insulation sleeve one end and the dead ring other end is inclined-plane.
The insulating component is formed by high-strength insulating material.The design makes it while meeting insulating requirements, also has
There is higher reliability, and the design of its structure is made to become simple.
The sealing ring is O-shaped rubber seal.
The invention adopts the above technical scheme, the design of insulated enclosure retaining ring, can to one end face of the second joint pipe body with
It is insulated and is sealed between internal plug seat sagittal plane；The design of sealing ring, can to second joint pipe body one end periphery wall with it is interior
It is sealed between jack axial face；The design of internal plug seat is used not only for accommodating insulated enclosure retaining ring and plants connection the
Two joint pipe body one end, and can with sealing ring cooperate for second joint pipe body one end carry out radial positioning and sealing with
And axial limiting is carried out to insulated enclosure retaining ring and dead ring；The design of insulating component, can be to second joint pipe body one end outside
Between peripheral wall and internal plug seat axial face and second joint pipe body one end periphery wall, the first joint pipe body other end and locking
It insulate between first inner conical surface of nut；The design of locking nut, can in locking nut gradually rundown process,
It cooperates between each components of insulating joint, act synergistically, give full play to respective structural advantage, so that insulating joint is gradually tight
It gathers, so that it is guaranteed that there is excellent insulation performance, structural strength, leakproofness and reliability with higher, and it is with higher
Economy and maintainability.Rationally, structure is simple, and without welding, technology difficulty is small, economy for insulating joint design of the invention
Good, good airproof performance has enough radial strengths and axial strength, can satisfy the pressure testing intensity of 168MPa after tested without damaging
Bad, high reliablity, long service life is applicable to the inflammable and explosive pipelines such as gas transmission and distribution pipeline, oil product conveyance conduit
Insulation connection.
Detailed description of the invention
Now in conjunction with attached drawing, the present invention is further elaborated:
Fig. 1 is the structural schematic diagram of insulating joint of the present invention；
Fig. 2 is the structural schematic diagram of the first joint pipe body of the invention；
Fig. 3 is the structural schematic diagram of the second joint pipe body of the invention；
Fig. 4 is the structural schematic diagram of locking nut of the present invention；
Fig. 5 is the structural schematic diagram of dead ring of the present invention；
Fig. 6 is the structural schematic diagram of insulation sleeve of the present invention；
Fig. 7 is the structural schematic diagram of present invention support conical ring.
Specific embodiment
As shown in one of Fig. 1-7, insulating joint of the invention is applied to insulation two pressure pipelines 71,72 of connection, described
Insulating joint includes the first joint pipe body 1 and the second joint pipe body 2, described first joint pipe body, 1 one end and the second joint pipe body 2
The other end is separately connected two pressure pipelines 71,72, and 1 other end of the first joint pipe body is equipped with external screw thread 11 and internal plug seat 12, interior
Insulated enclosure retaining ring 3 is equipped in jack 12, sliding sleeve is equipped with insulating component 4 and locking on 2 one end periphery wall of the second joint pipe body
Nut 5, insulating component 4 is set between 2 periphery wall of 5 inner wall of locking nut and the second joint pipe body, and is positioned by a positioning member 6
And it is fixed, 5 one end of locking nut is equipped with internal screw thread 51 and is threadedly coupled with external screw thread 11, and 5 other end of locking nut is equipped with and insulation
Compatible first inner conical surface 52 of component 4；When the internal screw thread 51 is threadedly coupled with external screw thread 11,52 pushing tow of the first inner conical surface is exhausted
Internal plug seat 12 is inserted into edge component 4 and 2 one end of the second joint pipe body, 2 one end face of the second joint pipe body and 12 sagittal plane of internal plug seat it
Between by insulated enclosure retaining ring 3 insulate and seal, pass through between 2 one end periphery wall of the second joint pipe body and 12 axial face of internal plug seat
The insulation of 4 one end of insulating component, and the sealing ring 6 by being equipped with seals, 2 one end periphery wall of the second joint pipe body, the first junction block
It is insulated between 1 other end of body and the first inner conical surface 52 of locking nut 5 by insulating component 4.
The insulating component 4 includes dead ring 41 and insulation sleeve 42, and the dead ring 41 is L shape, and 41 one end of dead ring is used
In insertion internal plug seat 12,41 other end of dead ring, one sagittal plane 411 is described for being against 1 other end of the first joint pipe body
Insulation sleeve 42 is taper, and 42 one end of insulation sleeve is equipped with axial for being resisted against 41 other end of dead ring, 42 other end of insulation sleeve
Extension 421；When the internal screw thread 51 is threadedly coupled with external screw thread 11, locking nut 5 drives insulation sleeve 42 to slide, insulation sleeve 42
One end is resisted against 41 other end of dead ring, and internal plug seat 12 is inserted into 41 one end of pushing tow dead ring, and axially-extending portion 421 stretches out insulation
5 other end of locking nut is with 5 other end of locking nut and the insulation of 2 one end periphery wall of the second joint pipe body of insulating.The dead ring
41 design while making it have insulation, buffer action, also has the function of transmitting coupling mechanism force and positioning, and make its with it is exhausted
Edge covers 42 one end fits, play the impurity such as the extraneous metallic particles of prevention, dust enter in insulating joint and cause structural damage or
Person forms conductive path；The design of 42 extension of insulation sleeve allows to avoid 5 other end of locking nut and the second joint pipe body
Cause conductive path because impurity is accumulated between 2 periphery walls.
12 inlet of internal plug seat of first joint pipe body 1 be equipped with 60 ° of chamfering structures 13, described 41 one end of dead ring with
The outer wall junction of 41 other end of dead ring is equipped with transition face 412 compatible with the chamfering structure 13.The design is so that insulation
Ring 41 can be contacted with 1 other end of the first joint pipe body and 12 entrance of internal plug seat in half package status, so that in locking nut 5
During constantly tightening, 41 one end of dead ring can gradually be pressed in 2 one end periphery wall of the second joint pipe body and internal plug seat
Between 12 axial faces, insulating effect is played, and generate good axially and radially positioning action.
The positioning member 6 includes support conical ring 61 and elastic spring 62, and the elastic spring 62 is embedded in the second connector
In the circlip groove 21 that 2 one end periphery wall of tube body is equipped with, the support conical ring 61 is slidably located in outside 2 one end of the second joint pipe body
On peripheral wall, 42 one end inner walls are covered for setting supports insulative, support 61 one end of conical ring is equipped with interior locating slot 611；The internal screw thread
51 with external screw thread 11 when being threadedly coupled, and locking nut 5 drives insulation sleeve 42 and support conical ring 61 to slide, and interior locating slot 611 is axial
Surface cover is located at outside elastic spring 62, and interior 611 sagittal plane of locating slot is against on elastic spring 62.
Second joint pipe body, 2 one end periphery wall is equipped with mating surface 22 compatible with 41 one end inner wall of dead ring.
Second joint pipe body, 2 one end periphery wall is equipped with the seal groove 23 for installing sealing ring 6.
41 one end inner wall of dead ring is equipped with third inner conical surface 413；The third inner conical surface 413 and axis of the dead ring 41
Center line is at 30 ° of angles.When the design is so that the assembly of locking nut 5 is locked in the first joint pipe body 1, it can generate good
Positioning and fastening effect.
The 52 cone angle degree of the first inner conical surface of the locking nut 5 is 40 °；The first outer cone that the support conical ring 61 is equipped with
The 423 cone angle degree of 422 cone angle degree of the second male cone (strobilus masculinus) and the second inner conical surface that 611 cone angle degree of face, 42 one end of insulation sleeve are equipped with
It is identical as 52 cone angle degree of the first inner conical surface of locking nut 5.The design can ensure that active force when locking is uniform
It is directed toward axis center, to improve the stability of insulating joint structure.
The contact surface of described 42 one end of insulation sleeve and 41 other end of dead ring is inclined-plane.
The insulating component 4 is formed by high-strength insulating material.The design makes it while meeting insulating requirements, also has
There is higher reliability, and the design of its structure is made to become simple.
The sealing ring 6 is O-shaped rubber seal.
The invention adopts the above technical scheme, the design of insulated enclosure retaining ring 3, can be to 2 one end face of the second joint pipe body
It is insulated and is sealed between 12 sagittal plane of internal plug seat；The design of sealing ring 6, can be to 2 one end periphery of the second joint pipe body
It is sealed between 12 axial face of wall and internal plug seat；The design of internal plug seat 12 is used not only for accommodating 3 He of insulated enclosure retaining ring
Connection 2 one end of the second joint pipe body is planted, and can be cooperated with sealing ring 6 for carrying out diameter to 2 one end of the second joint pipe body
To positioning with sealing and to insulated enclosure retaining ring 3 and the progress axial limiting of dead ring 41；The design of insulating component 4, can be right
Between second joint pipe body, 2 one end periphery wall and 12 axial face of internal plug seat and 2 one end periphery wall of the second joint pipe body, first
It insulate between 1 other end of joint pipe body and the first inner conical surface 52 of locking nut 5；The design of locking nut 5, can
Enough in locking nut 5 gradually rundown process, cooperates, acts synergistically between each components of insulating joint, giving full play to respectively
Self-structure advantage, so that insulating joint is gradually compact, so that it is guaranteed that having excellent insulation performance, structure with higher is strong
Degree, leakproofness and reliability, and economy with higher and maintainability.Rationally, structure is simple for insulating joint design of the invention
Single, without welding, technology difficulty is small, good economy performance, good airproof performance, has enough radial strengths and axial strength, after tested
The pressure testing intensity of 168MPa be can satisfy without damaging, high reliablity, long service life is applicable to such as gas transmission and distribution pipe
The insulation of the inflammable and explosive pipelines such as line, oil product conveyance conduit connects.
Above description should not have any restriction to protection scope of the present invention.
Claims (9)
1. a kind of insulating joint is applied to insulation two pressure pipelines of connection, it is characterised in that: the insulating joint includes first
Joint pipe body and the second joint pipe body, first joint pipe body one end and the second joint pipe body other end are separately connected two pressures
Hydraulic piping, the first joint pipe body other end are equipped with external screw thread and internal plug seat, are equipped with insulated enclosure retaining ring, the second connector in internal plug seat
Sliding sleeve is equipped with insulating component and locking nut on the periphery wall of tube body one end, and insulating component is set to locking nut inner wall and connects with second
Between the external peripheral wall of head tube, and by a positioning member positioning and fixing, locking nut one end is equipped with internal screw thread and external screw thread screw thread
Connection, the locking nut other end are equipped with the first inner conical surface compatible with insulating component；The internal screw thread and external screw thread screw thread connect
When connecing, internal plug seat is inserted into the first inner conical surface pushing tow insulating component and second joint pipe body one end, one end face of the second joint pipe body with
It insulate and seals by insulated enclosure retaining ring between internal plug seat sagittal plane, second joint pipe body one end periphery wall and internal plug seat are axial
It is insulated between face by insulating component one end, and the sealing of the sealing ring by being equipped with, second joint pipe body one end periphery wall, first
It is insulated between joint pipe body other end and the first inner conical surface of locking nut by insulating component；The insulating component includes exhausted
Edge ring and insulation sleeve, the dead ring are L shape, and dead ring one end is used for being inserted into internal plug seat, one sagittal plane of the dead ring other end
In being against on the first joint pipe body other end, the insulation sleeve is taper, and insulation sleeve one end is another for being resisted against dead ring
On end, the insulation sleeve other end is equipped with axially-extending portion；When the internal screw thread is threadedly coupled with external screw thread, locking nut drives insulation
Set sliding, insulation sleeve one end is resisted against the dead ring other end, and internal plug seat is inserted into pushing tow dead ring one end, and axially-extending portion is stretched out
The insulation locking nut other end is with the locking nut other end and the insulation of second joint pipe body one end periphery wall of insulating.
2. a kind of insulating joint according to claim 1, it is characterised in that: the internal plug seat entrance of first joint pipe body
Place is equipped with 60 ° of chamfering structures, and described dead ring one end and the outer wall junction of the dead ring other end are equipped with and the chamfering structure phase
The transition face of adaptation.
3. a kind of insulating joint according to claim 1, it is characterised in that: the positioning member includes support conical ring and steel
Silk retaining ring, the elastic spring is in the circlip groove that second joint pipe body one end periphery wall is equipped with, the support conical ring
It is slidably located on second joint pipe body one end periphery wall, covers one end inner wall for setting supports insulative, support conical ring one end is set
There is interior locating slot；When the internal screw thread is threadedly coupled with external screw thread, locking nut drives insulation sleeve and support conical ring sliding, default
Position fluted shaft is located at outside elastic spring to surface cover, and interior locating slot sagittal plane is against on elastic spring.
4. a kind of insulating joint according to claim 3, it is characterised in that: on the periphery wall of second joint pipe body one end
Equipped with mating surface compatible with dead ring one end inner wall.
5. a kind of insulating joint according to claim 4, it is characterised in that: described dead ring one end inner wall is equipped in third
The conical surface.
6. a kind of insulating joint according to claim 5, it is characterised in that: in the third inner conical surface and axis of the dead ring
Heart line is at 30 ° of angles.
7. a kind of insulating joint according to claim 3, it is characterised in that: the first inner conical surface cone angle of the locking nut
Degree is 40 °.
8. a kind of insulating joint according to claim 7, it is characterised in that: the first male cone (strobilus masculinus) that the cone of support is equipped with
The the second male cone (strobilus masculinus) cone angle degree and the second inner conical surface cone angle degree that cone angle degree, insulation sleeve one end are equipped with locking nut
First inner conical surface cone angle degree is identical.
9. a kind of insulating joint according to claim 1, it is characterised in that: the insulating component is by high-strength insulating material
Molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710209419.1A CN106764164B (en) | 2017-03-31 | 2017-03-31 | A kind of insulating joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710209419.1A CN106764164B (en) | 2017-03-31 | 2017-03-31 | A kind of insulating joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106764164A CN106764164A (en) | 2017-05-31 |
| CN106764164B true CN106764164B (en) | 2019-01-01 |
Family
ID=58965728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710209419.1A Active CN106764164B (en) | 2017-03-31 | 2017-03-31 | A kind of insulating joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106764164B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723922A (en) * | 2017-10-27 | 2019-05-07 | 北京精密机电控制设备研究所 | A kind of fluid connecting device of both ends insulation |
| CN110208648B (en) * | 2019-05-28 | 2024-04-09 | 国家电网有限公司 | Insulation device for preventing ground fault on electric power site |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB527999A (en) * | 1939-04-25 | 1940-10-21 | Patex Sa | Improvements in and relating to pipe couplings |
| JPS60192190A (en) * | 1984-03-14 | 1985-09-30 | 株式会社日立製作所 | Insulating joint pipe |
| JP3093676B2 (en) * | 1997-05-09 | 2000-10-03 | 大平洋特殊鋳造株式会社 | Telescopic and flexible insulated pipe fittings |
| JP3051839B1 (en) * | 1999-04-16 | 2000-06-12 | 大平洋特殊鋳造株式会社 | Telescopic and flexible insulated pipe fittings |
| CN2591374Y (en) * | 2002-12-14 | 2003-12-10 | 邹德润 | Corrosion resistant insulation pipe joint |
| CN2634240Y (en) * | 2003-06-04 | 2004-08-18 | 沈阳鑫联石化设备有限公司 | Insulation joint |
| CN2812318Y (en) * | 2005-05-17 | 2006-08-30 | 成都市川油科技发展有限公司 | Insulated connector for pipe line of cathodic-protection anticorrosive high-pressure gas storage well |
| CN206626304U (en) * | 2017-03-31 | 2017-11-10 | 福建上润精密仪器有限公司 | A kind of insulating joint |
-
2017
- 2017-03-31 CN CN201710209419.1A patent/CN106764164B/en active Active
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| CN106764164A (en) | 2017-05-31 |
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