CN211579556U

CN211579556U - Fusion type cold-shrinkage terminal

Info

Publication number: CN211579556U
Application number: CN201922393542.0U
Authority: CN
Inventors: 佘晓峰; 胡克勍; 刘文斌
Original assignee: Hangzhou Silicon Power Technology Co ltd
Current assignee: Hangzhou Silicon Power Technology Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-09-25
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses a fusion type cold contraction terminal, which relates to the field of cable accessories and adopts the technical scheme that the fusion type cold contraction terminal comprises an outer sheath, a steel armor and an inner sheath which are arranged in sequence; the inner sheath is inside to have first line core structure, second line core structure and the third line core structure that the components of a whole that can function independently set up, still includes the shrinkage terminal, the main insulating layer make by cross-linked polyethylene material, the shrinkage terminal is made by silicon rubber materials, is equipped with self-control gluing layer between main insulating layer and silicon rubber layer for main insulating layer and shrinkage terminal form integrative fusion formula interface. The adhesive layer fuses the crosslinked polyethylene material and the silicon rubber material into an integral structure in a chemical mode, so that the existence and the generation possibility of air gaps are fundamentally eliminated, the voltage resistance is improved, and air discharge is avoided; due to the existence of the adhesive layer, the tool marks and pits generated on the main insulation during construction can be repaired, the generation of tiny air gaps and tips is avoided, and the breakdown accidents caused by the penetration of water vapor from the wire core and the outside along the compression interface can be prevented.

Description

Fusion type cold-shrinkage terminal

Technical Field

The utility model relates to a cable accessories field, in particular to fusion shrinkage terminal.

Background

The cable accessory is used as an important link when the cable is butted, and partial discharge can be generated due to any insulation defect, so that the insulation is degraded and even broken down.

A lot of cable accessories puncture accidents can occur every year, more than 95% of installers cannot meet the standard in quality during installation, for example, the sharp corner of a crimping pipe is not polished: in the installation of the connector, the surface of the crimping part of the conductor core of the cable is not processed smoothly, and metal burrs, tips and edges and corners exist. When the cable is operated, the irregular parts generate point discharge due to electric field concentration. In the manufacturing process, the cable conductor core crimping position is not polished, and the edge angle of the crimping surface is reserved.

Such as main insulation longitudinal scratches: when stripping the outer semiconductive layer, a potential air gap is often left on the primary insulation surface due to the knife being too deep, and since the knife mark left on the insulation has a microscopically large gap, a void discharge occurs in the insulation, and electrical dendrites form which can cause insulation breakdown.

A layer of silicone grease is coated between the existing main insulation and cold-shrink joint to fill the air gap. For example, Wake's silicone grease is good in electrical insulation, high in dielectric strength, high in permittivity, small in dielectric constant, and not curable. After a long time, the silicone grease can be absorbed and converted into residual white carbon black powder, the butted interface between the main insulation and the cold-shrink joint is essentially an air compression interface which is mutually butted, an air gap is reserved after the silicone grease is absorbed, and water vapor permeates from the wire core and the outside along the compression interface, so that the main insulation is broken down.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fusion shrinkage terminal, it has the perfect complex of interface of product and cable accessories, has changed original interface characteristic, not only increases substantially the resistant thunder and lightning impact strength at interface, has difficult air gap, pointed end of producing simultaneously, avoids partial discharge and prevents that vapor from permeating to the advantage that compresses tightly the interface from both ends and sinle silk department.

A fusion type cold shrinkage terminal comprises an outer sheath, a steel armor and an inner sheath which are sequentially arranged;

the inner sheath is internally provided with a wire core structure, and the wire core structure comprises a first wire core structure, a second wire core structure and a third wire core structure which are arranged in a split manner;

the wire core structures comprise a copper shielding layer, a semi-conducting layer, a main insulating layer and a wire core which are sequentially arranged from outside to inside, and conductive connecting terminals are respectively arranged on exposed parts of the wire core;

the cold-shrink terminal is shrunk and coated on the outer side of the wire core structure, and a sealing structure is arranged at the shaft end of the cold-shrink terminal;

the main insulation layer make by the crosslinked polyethylene material, the shrinkage terminal is made by the silicon rubber material, is equipped with self-control adhesive layer between main insulation layer and shrinkage terminal, the adhesive layer is compound on the inner wall at main insulation layer and shrinkage terminal for main insulation layer and shrinkage terminal form integrative fusion interface.

By adopting the technical scheme, the silicone grease layers of the main insulation and cold-shrink terminal parts of the three wire core structures are changed into self-made adhesive layers, the original pressing type abutting is changed into the mutual connection of the main insulation layer and the cold-shrink joint through the adhesive layers, the crosslinked polyethylene material and the silicone rubber material are fused into an integral structure by the adhesive layers in a chemical mode, the existence and the generation possibility of air gaps are fundamentally eliminated, the voltage resistance is improved, and air discharge is avoided; because the existence of gluing layer has certain repair ability, can eliminate the construction defect that produces in the work progress, gluing layer has certain thickness after the solidification to utilize this thickness, repair tool mark, the pit that produces main insulation when the construction, avoid the production of small air gap and pointed end, can prevent again that aqueous vapor from sinle silk and outside along compressing tightly interface infiltration, the breakdown accident that leads to.

Further setting: the cold-shrink terminal comprises a sleeve-shaped silicon rubber body and a stress cone on the inner side of the silicon rubber body, wherein the stress cone is coated to the joint between the semi-conducting layer and the main insulating layer.

By adopting the technical scheme, after the installation is finished, enough elastic pressing force is ensured, so that good interface characteristics are ensured.

Further setting: the stress cone is coated to the joint between the semi-conducting layer and the main insulating layer, and the stress cone is positioned on the outer ring of the main insulating layer.

By adopting the technical scheme, the electric field distribution of the semi-conductive tail end is improved, and the electric field intensity at the edge of the semi-conductive tail end is reduced.

Further setting: root cover of first line core structure, second line core structure and third line core structure is equipped with three dactylotheca, and three dactylotheca extend to oversheath one side from the line core structure, and first line core structure, second line core structure and third line core are structural all to overlap and are equipped with the cold-shrinking protecting pipe that meets with three dactylotheca.

By adopting the technical scheme, the three finger sleeves finish the sealing of the outer sheath, the steel armor, the inner sheath and the wire core structure.

Further setting: a grounding wire recovery structure is arranged in the three finger sleeves and comprises a first grounding structure arranged on the steel armor and a second grounding structure arranged on the copper shielding layer of each wire core structure, and the first grounding structure and the second grounding structure are insulated and isolated from each other; the first grounding structure comprises steel armor braided wires connected to the steel armor and a steel armor constant force spring for fixing the steel armor braided wires on the steel armor; the second ground structure is including connecting the copper shield braided wire on each sinle silk structure's the copper shield layer and fixing the copper shield braided wire at the copper shield constant force spring on the steel armour.

By adopting the technical scheme, the grounding of the copper shielding layer and the grounding of the steel armor of each wire core structure are recovered.

Further setting: the sealing structure comprises a sealing rubber arranged at the crimping position of the wiring terminal and a phase belt which is sleeved on the end part and then coated with the cold-shrink terminal.

Through adopting above-mentioned technical scheme, accomplish the sealing of the binding post at the axle head department at cold-shrink terminal.

Further setting: the edge of the semi-conducting layer of any wire core structure is provided with a chamfer which enables the wire core structure and the main insulating layer to be in smooth transition.

Through adopting above-mentioned technical scheme, semi-conducting layer chamfer and main insulating layer smooth transition extend the cutting off department of insulating shield layer through the stress cone, make zero potential form loudspeaker form, have improved the electric field distribution of insulating shield layer, have reduced the possibility that corona produced, have reduced insulating destruction, have guaranteed the operating life of cable.

Drawings

FIG. 1 is a schematic view of a fused cold-shrink terminal;

FIG. 2 is a schematic cross-sectional view of a fused cold-shrink terminal;

FIG. 3 is a schematic view of a cold-shrink terminal.

In the figure, 1, an outer sheath; 2. steel armor; 3. an inner sheath; 4. a wire core structure; 41. a first core structure; 42. a second wire core structure; 43. a third core structure; 5. a cold-shrink terminal; 6. a copper shield layer; 7. a semiconducting layer; 8. a main insulating layer; 9. a wire core; 10. a wiring terminal; 11. a cold shrink sheathing tube; 12. three finger sleeves; 13. steel armor braided wire; 14. a steel armor constant force spring; 15. a first ground structure; 16. copper shielding braided wires; 17. a copper shielded constant force spring; 18. a second ground structure; 21. sealing glue; 22. a silicone rubber body; 23. a conductive tube; 24. a stress cone; 241. an annular sleeve; 242. and (4) an annular cone.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

First preferred embodiment:

a fusion cold-shrink terminal is shown in figure 1 and comprises an outer sheath 1, a steel armor 2 and an inner sheath 3 which are sequentially arranged.

As shown in fig. 1 and 2, the inner sheath 3 has the core structure 4 inside, and any core structure 4 is gradually stripped to the inner layer by the skin of tip and forms the layering and exposes the structure step by step, and first core structure 41, second core structure 42 and third core structure 43 that core structure 4 includes, any core structure 4 all including the copper shielding layer 6, semi-conducting layer 7, main insulation layer 8, sinle silk 9 that set gradually, is equipped with electrically conductive binding post 10 respectively at the exposure part of sinle silk 9.

This fusion shrinkage terminal still includes cold contraction terminal 5, and the shrinkage 5 shrink cladding at cold contraction terminal is in the outside of sinle silk structure 4, combines on sinle silk 9 at binding post 10 after, and cold contraction terminal 5 cladding is in the outside of binding post 10 and main insulation layer 8.

Before the cladding of cold-shrink terminal 5, the root cover of first line core structure 41, second line core structure 42 and third line core structure 43 is equipped with three dactylotheca 12, and three dactylotheca 12 extends to oversheath 1 one side from line core structure 4, all overlaps on first line core structure 41, second line core structure 42 and the third line core structure 43 to be equipped with the cold-shrink protective sleeve 11 that meets with three dactylotheca 12.

A ground wire recovery structure is arranged in the three-finger sleeve 12, the ground wire recovery structure comprises a first grounding structure 15 arranged on the steel armor 2 and a second grounding structure 18 arranged on the copper shielding layer 6 of each wire core structure 4, and the first grounding structure 15 and the second grounding structure 18 are insulated and isolated from each other; the first grounding structure 15 comprises steel armor braided wires 13 connected to the steel armor 2 and steel armor constant force springs 14 for fixing the steel armor braided wires 13 on the steel armor; the second grounding structure 18 comprises copper shield braided wires 16 connected to the copper shield layer 6 of each core structure 4 and copper shield constant force springs 17 fixing the copper shield braided wires 16 to the steel armor 2.

The cold-shrink terminal 5 is wrapped outside the primary insulation layer 8. The main insulation layer 8 is made by the crosslinked polyethylene material, and cold-shrink terminal 5 is made by the silicon rubber material, is equipped with self-control adhesive layer between main insulation layer 8 and cold-shrink terminal 5, and adhesive layer is compound on the inner wall of main insulation layer 8 and cold-shrink terminal 5 for main insulation layer 8 and cold-shrink terminal 5 form integrative fusion formula interface.

As shown in fig. 2 and 3, the cold-shrink terminal 5 includes a sleeve-shaped silicone rubber body 22, a stress cone 24 inside the silicone rubber body 22, the stress cone 24 being wrapped to a junction between the semiconductive layer 7 and the primary insulation layer 8, the stress cone 24 being located at an outer periphery of the primary insulation layer 8.

As shown in fig. 3, the sealing structure includes a sealant 21 disposed at the crimping portion of the terminal 10 and a phase tape (not shown) covering the end portion after being sleeved with the cold shrink terminal 5.

The border of the semi-conducting layer 7 of cable is equipped with the chamfer, and this chamfer is the fillet for

semi-conducting layer

7 and 8 smooth transition of main insulating layer, cable joint's electric field are distortion electric fields, and at the cutting off department of sinle silk and shielding layer, can produce electric stress concentration phenomenon, electric field intensity is very big, is the weak link of whole joint. Under the condition that the semi-conducting layer 7 is not chamfered, the electric field is concentrated, the phenomenon of insulation partial discharge breakdown can occur, the chamfered semi-conducting layer 7 and the main insulating layer 8 are in smooth transition, the condition of electric stress concentration is avoided, and the electric field intensity is balanced.

The adhesive layer is specifically as follows:

example 1:

the adhesive for silane crosslinked polyethylene and silicone rubber comprises A and B, wherein A comprises the following components in parts by weight:

100 parts of hydroxyl silicone oil, 10 parts of a base crosslinking agent, 10 parts of an additional crosslinking agent and 5 parts of hydrophobic fumed silica;

the basic cross-linking agent consists of 2 parts of methyltrimethoxysilane, 2 parts of methyltriethoxysilane, 2 parts of vinyltrimethoxysilane, 2 parts of vinyltriethoxysilane and 2 parts of phenyltrimethoxysilane; the additional crosslinking agent consists of 2 parts of isocyanatopropyltriethoxysilane, 2 parts of vinyltriisopropenoxysilane, 2 parts of methyltriisopropenoxysilane, 2 parts of phenyltriisopropenoxysilane and 2 parts of tetramethylguanidinopropyltrimethoxysilane;

the B comprises the following components in parts by weight:

100 parts of hydroxyl silicone oil, 5 parts of hydrophobic fumed silica and 0.2 part of catalyst;

the catalyst is organic tin chelate.

The adhesive is prepared according to the preparation method.

Example 2:

100 parts of hydroxyl silicone oil, 20 parts of a base crosslinking agent, 20 parts of an additional crosslinking agent and 10 parts of hydrophobic fumed silica;

the basic cross-linking agent consists of 4 parts of methyltrimethoxysilane, 4 parts of methyltriethoxysilane, 4 parts of vinyltrimethoxysilane, 4 parts of vinyltriethoxysilane and 4 parts of phenyltrimethoxysilane; the additional crosslinking agent consists of 4 parts of isocyanatopropyltriethoxysilane, 4 parts of vinyltriisopropenoxysilane, 4 parts of methyltriisopropenoxysilane, 4 parts of phenyltriisopropenoxysilane and 4 parts of tetramethylguanidinopropyltrimethoxysilane;

the B comprises the following components in parts by weight:

100 parts of hydroxyl silicone oil, 10 parts of hydrophobic fumed silica and 0.3 part of catalyst;

the catalyst is organic tin chelate.

The adhesive is prepared according to the preparation method.

Example 3:

100 parts of hydroxyl silicone oil, 25 parts of a base crosslinking agent, 30 parts of an additional crosslinking agent and 15 parts of hydrophobic fumed silica;

the basic cross-linking agent consists of 5 parts of methyltrimethoxysilane, 5 parts of methyltriethoxysilane, 5 parts of vinyltrimethoxysilane, 5 parts of vinyltriethoxysilane and 5 parts of phenyltrimethoxysilane; the additional crosslinking agent consists of 6 parts of isocyanatopropyltriethoxysilane, 6 parts of vinyltriisopropenoxysilane, 6 parts of methyltriisopropenoxysilane, 6 parts of phenyltriisopropenoxysilane and 6 parts of tetramethylguanidinopropyltrimethoxysilane;

the B comprises the following components in parts by weight:

100 parts of hydroxyl silicone oil, 15 parts of hydrophobic fumed silica and 0.5 part of catalyst;

the catalyst is organic tin chelate.

The adhesive is prepared according to the preparation method.

Example 4:

this embodiment is different from embodiment 2 only in that,

the base crosslinker consists of 4 parts of vinyltrimethoxysilane, 4 parts of vinyltriethoxysilane, 4 parts of phenyltrimethoxysilane, 4 parts of phenyltriethoxysilane, 4 parts of aminopropyltrimethoxysilane.

Example 5:

this embodiment is different from embodiment 2 only in that,

the base crosslinker consists of 10 parts methyltrimethoxysilane and 10 parts aminopropyltrimethoxysilane.

Example 6:

this embodiment is different from embodiment 2 only in that,

the additional crosslinking agent consists of 4 parts of gamma- (2, 3-glycidoxy) propyltrimethoxysilane, 4 parts of gamma- (2, 3-glycidoxy) propyltriethoxysilane, 4 parts of gamma-methacryloxypropyltrimethoxysilane, 4 parts of anilinomethyltrimethoxysilane and 4 parts of anilinomethyltriethoxysilane.

Example 7:

this embodiment is different from embodiment 2 only in that,

the additional crosslinker consists of 4 parts of aniline methyl triethoxysilane, 4 parts of aminoethyl aminopropyl methyl dimethoxysilane, 4 parts of diethylamino methyl triethoxysilane, 4 parts of gamma-methacryloxypropyl trimethoxysilane and 4 parts of gamma-methacryloxypropyl methyl dimethoxysilane.

Example 8:

this embodiment is different from embodiment 2 only in that,

the additional crosslinking agent is composed of 5 parts of isocyanatopropyltriethoxysilane, 5 parts of vinyltriisopropenoxysilane, 5 parts of methyltriisopropenoxysilane, and 5 parts of phenyltriisopropenoxysilane.

Example 9:

this embodiment is different from embodiment 2 only in that,

the catalyst is a guanidino catalyst.

Example 10:

this embodiment is different from embodiment 2 only in that,

the catalyst is a silane catalyst.

Comparative example 1:

this comparative example differs from example 2 only in that a does not contain a base crosslinker.

Comparative example 2:

this comparative example differs from example 2 only in that a does not contain an additional crosslinker.

Comparative example 3:

this comparative example differs from example 2 only in that a comprises 50 parts of the base crosslinker;

the base crosslinker consists of 10 parts methyltrimethoxysilane, 10 parts methyltriethoxysilane, 10 parts vinyltrimethoxysilane, 10 parts vinyltriethoxysilane, 10 parts phenyltrimethoxysilane.

Comparative example 4:

this comparative example differs from example 2 only in that a includes 50 parts of additional crosslinker;

the additional crosslinking agent was composed of 10 parts of isocyanatopropyltriethoxysilane, 10 parts of vinyltriisopropenoxysilane, 10 parts of methyltriisopropenoxysilane, 10 parts of phenyltriisopropenoxysilane, and 10 parts of tetramethylguanidinopropyltrimethoxysilane.

Comparative example 5:

this comparative example differs from example 2 only in that the catalyst in B is 10 parts.

Wherein examples 1-5 and comparative examples 1-3 both employ a first method of preparation and a first method of use; examples 6-10 and comparative examples 4-5 were both prepared using the second preparation method and the second method of use.

Comparative example 6:

kafft 704 glue was purchased from Higashi, New materials technology, Inc., Guangdong.

Comparative example 7:

kafft 703 glue was purchased from Higashi, New materials technology, Inc., Guangdong.

Comparative example 8:

3140 glue from Dow Corning.

Fifthly, performance detection:

1. detection items and test bases:

1-1: and (3) dielectric constant detection: reference is made to GB/T1409-2006 recommendation method for measuring permittivity and dielectric loss factor of an electrical insulating material under power frequency, audio frequency and high frequency (including meter wave wavelength);

1-2: and (3) detecting the insulating strength: reference is made to GB/T1408 insulating material electrical apparatus strength test method;

1-3: and (3) detecting the elongation: refer to HG/T3849 and 2008 determination of tensile strength and elongation at break of hard rubber;

1-4: and (3) detecting the shear strength: reference is made to GB/T7124-;

1-5: and (3) detecting the peeling strength: refer to GB/T2791-1995 adhesive T peel Strength test method for Flexible materials vs. Flexible materials.

As can be seen from the above tables, the adhesive prepared from silane crosslinked polyethylene and silicone rubber by the preparation method of the present application has good mechanical properties, especially glass strength, compared with those commonly used by those skilled in the art in the prior art, has outstanding performance advantages compared with products of the same type, and simultaneously ensures excellent insulating properties.

The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims

1. A fusion cold-shrink terminal comprises an outer sheath (1), a steel armor (2) and an inner sheath (3) which are arranged in sequence; the inner sheath (3) is internally provided with a wire core structure (4), and the wire core structure (4) comprises a first wire core structure (41), a second wire core structure (42) and a third wire core structure (43) which are arranged in a split mode;

the wire core structures (4) respectively comprise a copper shielding layer (6), a semi-conducting layer (7), a main insulating layer (8) and a wire core (9) which are sequentially arranged from outside to inside, and conductive connecting terminals (10) are respectively arranged at exposed parts of the wire cores (9);

the wire core structure is characterized by further comprising a cold-shrink terminal (5), wherein the cold-shrink terminal (5) is shrunk and coated on the outer side of the wire core structure (4), and a sealing structure is arranged at the shaft end of the cold-shrink terminal (5);

the method is characterized in that: main insulating layer (8) make by the cross-linked polyethylene material, cold-shrink terminal (5) are made by the silicon rubber material, are equipped with self-control gluing layer between main insulating layer (8) and cold-shrink terminal (5), gluing layer is compound on the inner wall of main insulating layer (8) and cold-shrink terminal (5) for main insulating layer (8) and cold-shrink terminal (5) form integrative fusion formula interface.

2. The fusion cold-shrink terminal of claim 1, wherein: the cold-shrink terminal (5) comprises a sleeve-shaped silicon rubber body (22), a stress cone (24) on the inner side of the silicon rubber body (22), and the stress cone (24) is coated at the joint between the semi-conducting layer (7) and the main insulating layer (8).

3. The fusion cold-shrink terminal of claim 2, wherein: the stress cone (24) is coated at the joint between the semi-conducting layer (7) and the main insulating layer (8), and the stress cone (24) is positioned at the outer ring of the main insulating layer (8).

4. The fusion cold-shrink terminal of claim 1, wherein: root cover of first line core structure (41), second line core structure (42) and third line core structure (43) is equipped with three dactylotheca (12), and three dactylotheca (12) extend to oversheath (1) one side from sinle silk structure (4), all overlaps on first line core structure (41), second line core structure (42) and third line core structure (43) to be equipped with cold shrinkage protective sleeve (11) that meet with three dactylotheca (12).

5. The fusion cold-shrink terminal of claim 4, wherein: a ground wire recovery structure is arranged in the three finger sleeves (12), the ground wire recovery structure comprises a first grounding structure (15) arranged on the steel armor (2) and a second grounding structure (18) arranged on the copper shielding layer (6) of each wire core structure (4), and the first grounding structure (15) and the second grounding structure (18) are insulated and isolated from each other; the first grounding structure (15) comprises steel armor braided wires (13) connected to the steel armor (2) and steel armor constant force springs (14) for fixing the steel armor braided wires (13) on the steel armor; the second grounding structure (18) comprises copper shielding braided wires (16) connected to the copper shielding layers (6) of the wire core structures (4) and copper shielding constant force springs (17) for fixing the copper shielding braided wires (16) on the steel armor (2).

6. The fusion cold-shrink terminal of claim 1, wherein: the sealing structure comprises a sealing glue (21) arranged at the crimping position of the wiring terminal (10) and a phase belt which is sleeved on the end part and is coated with the cold-shrink terminal (5).

7. The fusion cold-shrink terminal of claim 1, wherein: the edge of the semi-conducting layer (7) of any wire core structure (4) is provided with a chamfer which enables the wire core structure and the main insulating layer (8) to be in smooth transition.