CN110993154A - Ultrahigh-pressure submarine cable soft joint and manufacturing method thereof - Google Patents
Ultrahigh-pressure submarine cable soft joint and manufacturing method thereof Download PDFInfo
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- CN110993154A CN110993154A CN201911370669.9A CN201911370669A CN110993154A CN 110993154 A CN110993154 A CN 110993154A CN 201911370669 A CN201911370669 A CN 201911370669A CN 110993154 A CN110993154 A CN 110993154A
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- 239000004020 conductor Substances 0.000 claims abstract description 114
- 239000002184 metal Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 41
- 238000003466 welding Methods 0.000 claims abstract description 37
- 238000011084 recovery Methods 0.000 claims description 89
- 238000009413 insulation Methods 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 39
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 10
- 238000004073 vulcanization Methods 0.000 claims description 10
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- 239000011810 insulating material Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 5
- 230000005684 electric field Effects 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/009—Cables with built-in connecting points or with predetermined areas for making deviations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/14—Submarine cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/021—Features relating to screening tape per se
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
- H01R4/021—Soldered or welded connections between two or more cables or wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/70—Insulation of connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
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Abstract
The utility model provides an extra-high voltage submarine cable soft joint, soft joint restore the layer including conductor welding section, conductor shielding, insulating layer, the layer is restored to insulating shielding, metal sheath and oversheath restore the layer, and the conductor welding section sets up in the conductor tip department of two sections submarine cables, connects two sections submarine cable conductors, constitutes soft joint conductor part, the outside of conductor part is in proper order around being provided with conductor shielding and restores layer, insulating layer, metal sheath and the layer is restored to the oversheath to correspond respectively and constitute an organic whole structure with conductor shielding layer, insulating layer, metal sheath and the oversheath of two sections submarine cables are connected. The soft joint provided by the invention has the structural size close to that of a submarine cable body, has the same electrical performance, mechanical performance, bending performance and service life as the submarine cable body, and meanwhile, the manufacturing method of the soft joint is suitable for manufacturing submarine cable soft joints of molded lines, compressed circles and split conductors.
Description
Technical Field
The invention relates to the technical field of submarine cable manufacturing, in particular to an ultrahigh-pressure submarine cable flexible joint and a manufacturing method thereof.
Background
The submarine cable is mainly used for transmitting high-power electric energy underwater, has the same effect as an underground power cable, is harsher in application environment, and has higher transportation and laying difficulty than other cable products, so the submarine cable needs to be manufactured and produced continuously in large length. In the process of manufacturing the submarine cable, in order to make the submarine cable become a continuous line, the sections of the submarine cable must be connected into a whole, and the connection point of each section of the submarine cable is called a soft submarine cable connector, which is also called a factory connector. The submarine cable soft joint has the structural size close to that of the submarine cable body, and has the same electrical performance, mechanical performance, bending performance and service life as the submarine cable body.
The prior patent with publication number CN102593764A discloses a method for manufacturing a long submarine cable soft joint, which adopts an argon arc welding mode to weld staggered layers of conductors, adopts a half-sleeve structure for a conductor shielding layer, and adopts a semi-conductive self-adhesive tape to wrap the insulating shielding layer in a half-lap-cover mode. However, the method is not suitable for manufacturing the split conductor submarine cable soft joint, the materials of the conductor shielding layer and the insulation shielding repair layer of the soft joint are not consistent with the body, the electrical parameters such as dielectric constant and the like are different, and the performances of the conductor shielding layer and the insulation shielding layer of the soft joint are not reliable without the body materials.
Disclosure of Invention
In view of the above, the present invention provides an extra-high voltage submarine cable flexible joint and a manufacturing method thereof, and aims to solve the problem of performance difference between the existing flexible joint and a submarine cable body.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a soft joint of superhigh pressure submarine cable for connect two sections submarine cables, just the inside center of submarine cable has the conductor, the outside of conductor has set gradually conductor shield layer, insulating layer, insulation shield layer, metal sheath and oversheath, soft joint resumes layer, insulation shield layer, metal sheath and oversheath layer including conductor welding section, conductor shield resume layer, insulation shield, the layer is resumed to the metal sheath and the layer is resumed to the oversheath, conductor welding section welding sets up two sections the conductor tip department of submarine cable connects two sections the conductor of submarine cable constitutes the conductor part, the outside of conductor part is in proper order around being provided with conductor shield resumes layer, insulation resume layer, insulation shield resumes layer, metal sheath resume layer and the layer is resumed to correspond respectively with two sections the submarine cable the conductor shield layer, the insulating layer, The insulating shielding layer, the metal sheath and the outer sheath are connected to form an integral structure.
Preferably, the conductor shield recovery layer, the insulation shield recovery layer, the metal sheath recovery layer, and the outer sheath recovery layer are made of the same material as the conductor shield layer, the insulation shield layer, the metal sheath, and the outer sheath of the submarine cable.
Preferably, the flexible joint further includes a reaction cone, and the reaction cone is formed by tapering the end portions of the insulating layers of the two sea cables.
Preferably, the length of the reaction force cone is equal to or greater than three times the thickness of the insulating layer.
Preferably, the insulation displacement layer is formed with a stress cone at a location of the reaction force cone.
Preferably, a layer of semiconductive water-blocking tape is further wrapped between the metal sheath restoring layer and the insulation shielding restoring layer.
Meanwhile, the invention also provides a manufacturing method of the ultrahigh pressure submarine cable soft joint, which comprises the following steps:
s1, preprocessing: before the joint is manufactured, fixing the joint positions of the two sections of cables, and heating, dehumidifying and stripping and cutting the cables after straightening;
s2, conductor welding: welding the conductors of the two sections of submarine cables in one step by adopting a welding mode of heating welding to form a conductor welding section, forming a conductor part with the conductors of the two sections of submarine cables, and polishing the surface of the conductor part to be smooth after welding the structure;
s3, preparing a reaction force cone: the end parts of the insulating layers of the two sections of submarine cables are relatively cut into cones according to a standard that the length of the cone is not less than three times of the thickness of the insulating layer to form a reaction force cone, and the surface of the reaction force cone is polished to be smooth;
s4, recovering the conductor shielding layer: cutting a conductor shielding material with a proper size, tightly wrapping the conductor shielding material on the outer side surface of the conductor part, placing the cable wrapped with the conductor shielding material in a heating mould, heating to 130-140 ℃, keeping for 0.5-1 h, then removing the heating mould, and polishing the surface of the conductor shielding recovery layer to be smooth;
s5, insulating layer recovery: placing the cable with the recovered conductor shielding layer in an extrusion molding die, heating to 115-130 ℃ for 1-2 hours, starting the extrusion molding machine, stopping extrusion molding when the insulating materials overflow from the two ends of the extrusion molding die, cooling, and removing the extrusion molding die; putting the insulated and extruded cable into a vulcanization mold, sealing and filling nitrogen into the vulcanization mold until the internal pressure is 1.2Mpa, continuously heating the vulcanization mold to 190-200 ℃ and keeping for 1-2 hours, cooling and depressurizing, removing the vulcanization mold, taking out the cable, and polishing the surface of the insulation recovery layer formed on the cable smoothly;
s6, recovering the insulation shielding layer: cutting an insulation shielding material with a proper size, tightly wrapping the insulation shielding material on the outer side surface of the insulation recovery layer, then placing the cable wrapped with the insulation shielding material in a heating mould, heating to 130-140 ℃, keeping for 0.5-1 h, then removing the heating mould, and polishing the surface of the insulation shielding layer recovery layer to be smooth;
s7, joint inspection: irradiating the joint area by using an X-ray machine, observing an X-ray film in the joint area, and checking whether impurities, micropores and eccentricity meet the requirement or not;
s8, recovering the metal sheath: wrapping a layer of semiconductive water-blocking tape outside the insulation shielding recovery layer, then nesting a tubular lead sheath recovery material, and welding the side seam of the lead sheath recovery material and the connecting end of the lead sheath of the cable body to form a metal sheath recovery layer;
s9, restoring the outer sheath: cutting an outer sheath material with a proper size, tightly wrapping the outer side surface of the metal sheath recovery layer, wrapping the outer sheath material with a high-temperature-resistant belt, heating the high-temperature-resistant belt by using a drying gun to bond the outer sheath material with the outer sheath of the cable body, removing the high-temperature-resistant belt, and polishing the surface of the outer sheath recovery layer smoothly.
Compared with the prior art, the ultrahigh pressure submarine cable soft joint and the manufacturing method thereof provided by the invention have the following advantages:
1) the conductor is welded by adopting exothermic welding, and the metal is impacted at high speed by using shock waves generated when explosive explodes and is combined in a very short metallurgical process. Compared with layered argon arc welding, the heating welding is one-step forming of the conductor, the joint interface bonding strength is high, and the welding method is suitable for welding of large-section conductors such as split conductors and the like and is wide in application range.
2) The conductor shielding recovery layer, the insulation shielding recovery layer, the metal sheath recovery layer and the outer sheath recovery layer are made of the same material as the conductor shielding layer, the insulation shielding layer, the metal sheath and the outer sheath corresponding to the submarine cable body. The submarine cable body is used for repairing corresponding materials of all layers, and electrical parameters such as dielectric constant and the like and physical parameters such as elastic modulus and the like of all layers of the soft joint are consistent with the materials of the cable body, so that the soft joint has the same electrical performance, mechanical performance, bending performance and service life as the submarine cable body.
3) The length of the reaction force cone is set to be not less than three times of the insulation thickness of the body, so that the electric field distribution is reasonable, and the electric field intensity of a joint surface of the insulation layer and the insulation recovery layer meets the requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an internal structure of a stripped ultrahigh-pressure submarine cable flexible joint provided by the invention.
Reference numerals and component parts description referred to in the drawings:
1. a conductor welding section; 2. a conductor shield layer; 3. a conductor shield recovery layer; 4. a reaction force cone; 5. a stress cone; 6. an insulation recovery layer; 7. insulating shielding reserved layer; 8. an insulation shield recovery layer; 9. a metal sheath recovery layer; 10. an outer jacket recovery layer; 11. a conductor.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flexible joint for extra-high pressure submarine cables is used for connecting the end parts of two sections of submarine cables. The inner center of the existing submarine cable is provided with a conductor 11, and a conductor shielding layer 2, an insulating layer, an insulating shielding layer, a metal sheath and an outer sheath are sequentially arranged outside the conductor 11.
The soft joint provided by the invention comprises a conductor welding section 1, a conductor shielding recovery layer 3, an insulation recovery layer 6, an insulation shielding recovery layer 8, a metal sheath recovery layer 9 and an outer sheath recovery layer 10. In order to enable the soft joint to have the same electrical performance, mechanical performance, bending performance and service life as the submarine cable body, the conductor shielding recovery layer 3, the insulation recovery layer 6, the insulation shielding recovery layer 8, the metal sheath recovery layer 9 and the outer sheath recovery layer 10 of the soft joint are made of the same materials as the conductor shielding layer 2, the insulation layer, the insulation shielding layer, the metal sheath and the outer sheath of the submarine cable.
The conductor welding section 1 is welded at the end parts of the conductors 11 of the two submarine cables and is connected with the conductors 11 of the two submarine cables to form a conductor part. The outer side of the conductor part is sequentially provided with a conductor shielding recovery layer 3, an insulation recovery layer 6, an insulation shielding recovery layer 8, a metal sheath recovery layer 9 and an outer sheath recovery layer 10 in a surrounding manner, and the conductor shielding recovery layer, the insulation shielding layer, the metal sheath and the outer sheath of the two-section submarine cable are respectively and correspondingly connected to form an integral structure. A layer of semiconductive water-blocking tape is further wrapped between the metal sheath recovery layer 9 and the insulation shielding recovery layer 8, so that the insulation shielding recovery layer 8 is prevented from being damaged due to a high-temperature environment in the forming process of the metal sheath recovery layer 9.
Meanwhile, in order to achieve the purposes of reasonable electric field distribution and uniform electric field, the end parts of the insulating layers of the two sections of submarine cables are oppositely cut into cones to form the reaction force cone 4, and meanwhile, the length of the reaction force cone 4 is set to be more than or equal to three times of the thickness of the insulating layer, so that the electric field intensity of the joint surface of the insulating layer and the insulating recovery layer 6 meets the requirement. The insulation recovery layer 6 is formed with a stress cone 5 at the location of the reaction force cone 4.
The invention also provides a manufacturing method of the extra-high voltage submarine cable soft joint, which is suitable for manufacturing submarine cable soft joints of molded lines, compressed circles and split conductors. The method comprises the following specific steps:
s1, preprocessing:
before the joint is manufactured, the joint positions of the two sections of cables are fixed, and heating, dehumidifying and peeling-cutting treatment are carried out after the two sections of cables are straightened.
S2, conductor welding:
the conductors 11 of the two submarine cables are welded at one time by adopting a welding mode of heating welding to form a conductor welding section 1, the conductor welding section and the conductors 11 of the two submarine cables form a conductor part, and the surface of the conductor part is polished smoothly after the structure is welded, so that the surface of the conductor part is ensured to have no defects of burrs, air holes, pits and the like.
S3, preparing a reaction force cone:
the end parts of the insulating layers of the two sections of submarine cables are relatively cut into cones according to the standard that the length of the cone is not less than three times of the thickness of the insulating layer to form the reaction force cone 4, the purpose of uniform electric field is achieved, then the surface of the reaction force cone 4 is polished to be smooth and round, the interface between the conductor shielding layer 2 stripped from the cable and the insulating layer is clear, and no impurity is left.
S4, recovering the conductor shielding layer:
the method comprises the steps of cutting conductor shielding materials with proper sizes, tightly wrapping the conductor shielding materials on the outer side face of a conductor part, placing a cable wrapped with the conductor shielding materials in a heating mould, heating to 130-140 ℃ for 0.5-1 h, preferably heating to 140 ℃ generally, and keeping the temperature for 0.5h, removing the heating mould, taking out the cable, and connecting a conductor shielding recovery layer 3 and a conductor shielding layer 2 on a cable body into a whole. And then, the surface of the conductor shielding recovery layer 3 is trimmed by taking the defects of smooth and flat surface, no scratch, no air bubble, no pit and the like of the conductor shielding recovery layer 3 as requirements.
S5, insulating layer recovery:
and (3) placing the cable with the recovered conductor shielding layer in an extrusion molding die and fixing, and then heating to 115-130 ℃ for 1-2 h, preferably heating to 130 ℃ generally and keeping the temperature for 1 h. And starting the plastic extruding machine, stopping plastic extruding when the phenomenon that the insulating materials overflow from the two ends of the plastic extruding mould occurs, and cooling and then removing the plastic extruding mould. And then putting the insulated and extruded cable into a vulcanization mold, sealing and filling nitrogen until the internal pressure is 1.2Mpa, heating the vulcanization mold to 190-200 ℃ and keeping the temperature for 1-2 h, and then preferably heating to 200 ℃ and keeping the temperature for 2 h. And after the temperature and the voltage are reduced, the vulcanizing mold is dismantled to take out the cable, and the insulation recovery layer 6 is connected with the insulation layer on the cable body into a whole. The surfaces of the insulation recovery layer 6 and the stress cone 5 formed on the cable are then polished to a smooth surface without pitting.
S6, recovering the insulation shielding layer:
cutting an insulation shielding material with a proper size, tightly wrapping the insulation shielding material on the outer side surface of the insulation recovery layer 6, then placing the cable wrapped with the insulation shielding material in a heating mould, heating to 130-140 ℃ and keeping for 0.5-1 h, then preferably heating to 140 ℃ and keeping the temperature for 0.5h, then removing the heating mould, and finishing the surface of the insulation shielding layer 8 by taking the defects of smooth and flat surface, no scratch, no bubble, no pit and the like of the insulation shielding layer 8 as requirements.
S7, joint inspection:
and irradiating the joint area by using an X-ray machine, observing an X-ray film in the joint area, and checking whether impurities, micropores and eccentricity meet the requirements or not.
S8, recovering the metal sheath:
and a layer of semiconductive water-blocking tape is wrapped outside the insulation shielding recovery layer 8, so that the insulation shielding recovery layer 8 after being repaired is prevented from being damaged due to high temperature when a lead sleeve recovery material is welded. Nesting a tubular lead sheath recovery material to the outer side of a copper strip on the cable, welding the edge seam of the lead sheath recovery material to form a metal sheath recovery layer 9, and welding the lead sheath recovery material and the connecting end of the lead sheath of the cable body to connect the metal sheath recovery layer 9 and the metal sheath on the submarine cable body into a whole.
S9, restoring the outer sheath:
the method comprises the steps of cutting an outer sheath material with a proper size, tightly wrapping the outer side face of a metal sheath recovery layer 9, wrapping and winding a high-temperature resistant belt outside the outer sheath material because the outer sheath material is damaged due to direct contact with high temperature, uniformly heating the high-temperature resistant belt by using a baking gun to melt the outer sheath material to form an outer sheath recovery layer 10, bonding the outer sheath recovery layer with an outer sheath of a cable body to form an integral structure, and generally heating the integral structure to 200 ℃ for 10 min. And then, removing the high-temperature resistant belt, and finishing the surface of the outer sheath restoring layer 10 to ensure that the surface of the outer sheath restoring layer 10 is smooth and flat without pits.
The invention aims to solve the problem that the existing soft joint and a submarine cable body have performance difference at present, the provided soft joint manufacturing method is suitable for manufacturing the submarine cable soft joint of molded lines, compressed round shapes and split conductors, the structural size of the obtained soft joint is close to that of the submarine cable body, and the soft joint has the same electrical performance, mechanical performance, bending performance and service life as the submarine cable body.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides an ultrahigh pressure submarine cable soft joint for connect two sections submarine cables, just the inside center of submarine cable has the conductor, the outside of conductor has set gradually conductor shield, insulating layer, insulation shield, metal sheath and oversheath, its characterized in that: the flexible joint comprises a conductor welding section, a conductor shielding recovery layer, an insulation shielding recovery layer, a metal sheath recovery layer and an outer sheath recovery layer, wherein the conductor welding section is welded at the conductor end parts of the two submarine cables and is connected with the two conductors of the submarine cables to form a conductor part, and the outer side of the conductor part is sequentially provided with the conductor shielding recovery layer, the insulation shielding recovery layer, the metal sheath recovery layer and the outer sheath recovery layer in a surrounding manner and respectively corresponds to the conductor shielding layer, the insulation shielding layer, the metal sheath and the outer sheath of the submarine cables to form an integral structure.
2. An extra high pressure submarine cable soft joint according to claim 1, wherein: the conductor shielding recovery layer, the insulation shielding recovery layer, the metal sheath recovery layer and the outer sheath recovery layer are made of the same material as the conductor shielding layer, the insulation shielding layer, the metal sheath and the outer sheath of the submarine cable.
3. An extra high pressure submarine cable soft joint according to claim 1, wherein: the flexible joint further comprises a reaction force cone, and the end parts of the insulating layers of the two sections of submarine cables are oppositely tapered to form the reaction force cone.
4. An extra high pressure submarine cable soft joint according to claim 3, wherein: the length of the reaction force cone is more than or equal to three times of the thickness of the insulating layer.
5. An extra high pressure submarine cable soft joint according to claim 3, wherein: the insulation recovery layer is formed with a stress cone at a location of the reaction force cone.
6. An extra high pressure submarine cable soft joint according to claim 1, wherein: and a layer of semi-conductive water-blocking tape is wrapped between the metal sheath restoring layer and the insulation shielding restoring layer.
7. A method for manufacturing a soft joint of an extra-high pressure submarine cable according to any one of claims 1 to 6, wherein: the method comprises the following steps:
s1, preprocessing: before the joint is manufactured, fixing the joint positions of the two sections of cables, and heating, dehumidifying and stripping and cutting the cables after straightening;
s2, conductor welding: welding the conductors of the two sections of submarine cables in one step by adopting a welding mode of heating welding to form a conductor welding section, forming a conductor part with the conductors of the two sections of submarine cables, and polishing the surface of the conductor part to be smooth after welding the structure;
s3, preparing a reaction force cone: the end parts of the insulating layers of the two sections of submarine cables are relatively cut into cones according to a standard that the length of the cone is not less than three times of the thickness of the insulating layer to form a reaction force cone, and the surface of the reaction force cone is polished to be smooth;
s4, recovering the conductor shielding layer: cutting a conductor shielding material with a proper size, tightly wrapping the conductor shielding material on the outer side surface of the conductor part, placing the cable wrapped with the conductor shielding material in a heating mould, heating to 130-140 ℃, keeping for 0.5-1 h, then removing the heating mould, and polishing the surface of the conductor shielding recovery layer to be smooth;
s5, insulating layer recovery: placing the cable with the recovered conductor shielding layer in an extrusion molding die, heating to 115-130 ℃ for 1-2 hours, starting the extrusion molding machine, stopping extrusion molding when the insulating materials overflow from the two ends of the extrusion molding die, cooling, and removing the extrusion molding die; putting the insulated and extruded cable into a vulcanization mold, sealing and filling nitrogen into the vulcanization mold until the internal pressure is 1.2Mpa, continuously heating the vulcanization mold to 190-200 ℃ and keeping for 1-2 hours, cooling and depressurizing, removing the vulcanization mold, taking out the cable, and polishing the surface of the insulation recovery layer formed on the cable smoothly;
s6, recovering the insulation shielding layer: cutting an insulation shielding material with a proper size, tightly wrapping the insulation shielding material on the outer side surface of the insulation recovery layer, then placing the cable wrapped with the insulation shielding material in a heating mould, heating to 130-140 ℃, keeping for 0.5-1 h, then removing the heating mould, and polishing the surface of the insulation shielding layer recovery layer to be smooth;
s7, joint inspection: irradiating the joint area by using an X-ray machine, observing an X-ray film in the joint area, and checking whether impurities, micropores and eccentricity meet the requirement or not;
s8, recovering the metal sheath: wrapping a layer of semiconductive water-blocking tape outside the insulation shielding recovery layer, then nesting a tubular lead sheath recovery material, and welding the side seam of the lead sheath recovery material and the connecting end of the lead sheath of the cable body to form a metal sheath recovery layer;
s9, restoring the outer sheath: cutting an outer sheath material with a proper size, tightly wrapping the outer side surface of the metal sheath recovery layer, wrapping the outer sheath material with a high-temperature-resistant belt, heating the high-temperature-resistant belt by using a drying gun to bond the outer sheath material with the outer sheath of the cable body, removing the high-temperature-resistant belt, and polishing the surface of the outer sheath recovery layer smoothly.
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| CN117584393A (en) * | 2024-01-19 | 2024-02-23 | 哈尔滨哈普电气技术有限责任公司 | Factory joint heating system adopting insulating molding die and application method thereof |
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Effective date of registration: 20200821 Address after: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant after: ZHONGTAN TECHNOLOGY SUBMARINE CABLE Co.,Ltd. Address before: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant before: ZHONGTAN TECHNOLOGY SUBMARINE CABLE Co.,Ltd. Applicant before: JIANGSU ZHONGTIAN TECHNOLOGY Co.,Ltd. |
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Address after: 226000 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant after: Zhongtian Technology submarine cable Co.,Ltd. Address before: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant before: ZHONGTAN TECHNOLOGY SUBMARINE CABLE Co.,Ltd. |
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