CN214227155U

CN214227155U - Cable welding joint

Info

Publication number: CN214227155U
Application number: CN202120504957.5U
Authority: CN
Inventors: 陈标; 高钦
Original assignee: Ennis Fujian Technology Co ltd
Current assignee: Ennis Fujian Technology Co ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-09-17
Anticipated expiration: 2031-03-10

Abstract

The utility model relates to a cable fusion joint, which relates to the technical field of cable connection, and comprises a copper core fusion joint formed by left and right connection of a first copper core and a second copper core; the periphery of the circumference of the copper core welding head is sequentially provided with an inner shielding recovery layer, a main insulation recovery layer, an outer shielding recovery layer, a steel armor recovery layer and a cable outer sheath recovery layer from inside to outside, the inner shielding recovery layer, the main insulation recovery layer, the outer shielding recovery layer, the steel armor recovery layer and the cable outer sheath recovery layer are all recovered according to the original cable structure and are made of the same material as the original cable, the formed structure is consistent with the original cable structure, the design principle is consistent with the design principle of the original cable, and the electric field distribution of the copper core welding head after being connected through melting is consistent. The copper core welding head in this scheme adopts exothermic welding technique, and circumference diameter size is as good as original copper core, low resistance, high strength, and the welding point is difficult ageing, can stand fault current and strike and long-term heavy current operation.

Description

Cable welding joint

Technical Field

The utility model relates to a cable connection technical field especially relates to a cable welded joint.

Background

Because the production technology of cable electric power, factors influences such as place, transportation, cable length receives the restriction, and electric power needs to use a large amount of joints in transmission process, because cable service environment relates to city underground electric wire netting, crosses river, crosses sea and various complicated factors. Therefore, in order to guarantee the electricity consumption of resident life and enterprises and public institutions, the reliability of the middle connection of the cable is very important.

However, the cable sleeve crimping physical connection method used at present has the defects of reduced conductor performance, easy aging of materials, partial discharge breakdown of an insulating layer caused by long-time operation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving and having the shortcoming among the prior art, and a cable welded joint that proposes, its performance is equivalent with former cable, and resistance is low, and intensity is high, and the welding point is difficult for ageing, can stand fault current and strike and long-term heavy current operation.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a cable fusion joint comprises a copper core fusion joint, wherein the copper core fusion joint is formed by fusion connection of a first copper core and a second copper core in a left-right mode, the outer surface of the copper core fusion joint is sequentially wrapped with an inner shielding recovery layer, a main insulation recovery layer, an outer shielding recovery layer, a steel armor recovery layer and an outer sheath recovery layer, the left end and the right end of the inner shielding recovery layer are connected with the inner shielding layer, the left end and the right end of the main insulation recovery layer are connected with the main insulation layer, the left end and the right end of the outer shielding recovery layer are connected with the outer shielding layer, the left end and the right end of the steel armor recovery layer are connected with the steel armor layer, and the left end and the right end of the outer sheath recovery layer are connected with the outer sheath layer; copper core heat sealing head uses graphite mold to make, graphite mold includes the mould body and sets up the notched lid, the lid with the mould body passes through hinged joint, mould body upper portion is equipped with the reaction chamber, mould body lower part is equipped with the welding chamber, the reaction chamber with the welding chamber passes through the guiding gutter intercommunication, the reaction chamber bottom is equipped with the isolation gasket, the isolation gasket is equipped with through-hole one, the welding chamber is equipped with the through-hole two of controlling both ends intercommunication, the through-hole two-purpose is used for holding first copper core and second copper core joint end.

Preferably, the first copper core and the second copper core are connected by melting and welding through heat release.

Preferably, the circumferential diameter of the copper core welding joint is equal to the circumferential diameter of the first copper core or the second copper core.

Preferably, the main insulation recovery layer is made of XLPE material and is the same as the main insulation layer, the inner shielding recovery layer is made of the same material as the inner shielding layer, and the outer shielding recovery layer is made of the same material as the outer shielding layer.

Preferably, the left side and the right side of the groove are communicated.

Preferably, the aperture of the first through hole is the same as the inner diameter of the guide groove.

Preferably, the reaction chamber is of an inverted round table structure with a large upper end opening and a small lower end opening.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the copper core welded joint in this scheme adopts exothermic welding technique, and circumference diameter size and former copper core are as an organic whole, low resistance, high strength, and the welding point is difficult ageing, can stand fault current and strike and long-term heavy current operation, and tensile strength is strong.

2. Copper core weld joint fused connection in this scheme, the cable flexible of restoration department, need not worry that the cable drags and causes the influence.

3. The main insulation recovery layer in the scheme is recovered by using an XLPE material, so that the main insulation recovery layer and the main insulation layer are combined in a melting mode without an air gap interface, the integral structure consistent with the original cable is formed structurally, obvious joint characteristics are avoided, the insulation strength is consistent with that of the original cable, and the cable has stable operation durability.

4. According to the scheme, the inner shielding recovery layer and the outer shielding recovery layer are recovered and manufactured according to the structure, the specification and the same material of the inner shielding layer and the outer shielding layer of the original cable, so that the cable electric field shielding layer which is continuously and equivalently matched with the original cable at the repaired position is realized, and the electric field distribution and the electric field intensity are in the best natural state.

5. This scheme graphite jig simple structure, it is convenient to remove, and the welding does not receive the environmental impact, need not external power source and can weld, releases higher temperature during the welding, can the melting large cross-section conductor.

Drawings

Fig. 1 is a schematic structural view of a welded cable according to the present invention;

FIG. 2 is a schematic structural view of a cable to be welded according to the present invention;

fig. 3 is a schematic view of the sectional structure of the graphite mold of the present invention.

In the figure: 1. a copper core weld joint; 2. a first copper core; 3. a second copper core; 4. an inner shield layer; 5. a main insulating layer; 6. an outer shield layer; 7. a steel armor layer; 8. an outer jacket layer; 9. an inner shield recovery layer; 10. a primary insulation recovery layer; 11. an outer shield recovery layer; 12. a steel armor recovery layer; 13. an outer jacket recovery layer; 14. a graphite mold; 15. a mold body; 16. a cover; 17. a groove; 18. a hinge; 19. a reaction chamber; 20. a welding cavity; 21. a diversion trench; 22. an isolation gasket; 23. a first through hole; 24. and a second through hole.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

A cable fusion joint as shown in fig. 1-2, comprising a copper core fusion joint 1, wherein the copper core fusion joint is formed by fusion connecting a first copper core 2 and a second copper core 3 left and right;

the outer surface of the copper core welding head is sequentially wrapped with an inner shielding recovery layer 9, a main insulation recovery layer 10, an outer shielding recovery layer 11, a steel armour recovery layer 12 and an outer sheath recovery layer 13, the left end and the right end of the inner shielding recovery layer 9 are connected with an inner shielding layer 4, the left end and the right end of the main insulation recovery layer 10 are connected with a main insulation layer 5, the left end and the right end of the outer shielding recovery layer 11 are connected with an outer shielding layer 6, the left end and the right end of the steel armour recovery layer 12 are connected with a steel armour layer 7, and the left end and the right end of the outer sheath recovery layer 13 are connected with an outer sheath layer 8. The copper core of the cable is formed by twisting a plurality of strands of conducting wires, an air gap is easily formed between the copper core and the main insulating layer, the surface of the conductor is not smooth, and electric field concentration can be caused. And adding an inner shielding layer made of a semi-conductive material on the surface of the copper core, wherein the inner shielding layer is equipotential with the shielded copper core and is in good contact with the main insulating layer, so that partial discharge is avoided between the copper core and the main insulating layer. And a layer of outer shielding layer made of a semiconductive material is added on the surface of the main insulating layer, is in good contact with the shielded main insulating layer and is equipotential with the steel armor layer, so that partial discharge is avoided between the main insulating layer and the steel armor layer.

The first copper core 2 and the second copper core 3 are connected in a melting mode through exothermic welding. The exothermic welding can realize molecular welding, the copper core is not damaged, the integral effectiveness of the copper core interface is not changed, and the copper core can bear repeated heavy current impact during failure and is not fused.

The circumferential diameter of the copper core welding head 1 is equal to the circumferential diameter of the first copper core 2 or the second copper core 3. After the first copper core 2 and the second copper core 3 are connected in a left-right melting mode, the copper core welding head 1 is equal to the circumferential diameter of the first copper core 2 or the second copper core 3 in size through polishing.

The main insulation recovery layer 10 is made of XLPE material and is the same as the main insulation layer, the inner shielding recovery layer 9 is made of the same material as the inner shielding layer 4, and the outer shielding recovery layer 11 is made of the same material as the outer shielding layer 6. The main insulation recovery layer is recovered by using an XLPE material, so that the main insulation recovery layer and the main insulation layer are combined in a melting mode without an air gap interface, the integral structure consistent with the original cable is formed structurally, the joint characteristic is not obvious, the insulation strength is consistent with that of the original cable, and the durability of stable operation is realized.

Firstly, after the first copper core 2 and the second copper core 3 are connected by adopting exothermic welding, polishing the copper core welding head 1 into a shape consistent with the diameter of the first copper core 2 or the second copper core 3; then the inner shielding recovery layer is attached to the periphery of the exposed copper core; then, smearing the material of the main insulation recovery layer on the periphery of the inner shielding recovery layer, and pressing the material of the main insulation recovery layer on the copper core by using a tool; then the outer shielding recovery layer is attached to the periphery of the main insulation recovery layer; recovering a steel armor recovery layer around the outer shielding recovery layer, wherein one end of the steel armor recovery layer is connected with one end of the steel armor layer in a sleeved mode, and the other end of the steel armor recovery layer is fixed by riveting after being connected with the other end of the steel armor layer in a sleeved mode; and finally, sleeving the outer sheath recovery layer around the steel armor recovery layer, wherein the circumference of the recovered cable is basically equal to that of the original cable.

The inner shielding recovery layer, the main insulation recovery layer, the outer shielding recovery layer, the steel armor recovery layer and the outer sheath recovery layer are all recovered according to a cable structure and are made of the same material as an original cable, the formed structure is consistent with the original cable structure, the design principle is the same as that of the original cable, and the electric field distribution of the copper core welding head after connection through melting is consistent.

As shown in fig. 3, the graphite mold is used for fusion welding between the copper core fusion splices of the cable. The copper core welding joint is made by using a graphite mold 14, and the graphite mold has the advantages of small porosity, compact structure, high surface smoothness, strong oxidation resistance and the like, and has long average service life. The graphite mold 14 comprises a mold body 15 and a cover 16 provided with a groove 17, the cover 16 is connected with the mold body 15 through a hinge 18, the cover can be flexibly turned and closed, and the use is convenient. The upper part of the die body 15 is provided with a reaction cavity 19, the reaction cavity 19 is used for containing welding powder and ignition powder, and high-temperature reaction is generated after ignition to form high-temperature welding solution. The lower part of the die body 15 is provided with a welding cavity 20, and the welding cavity 20 is used for welding a copper core joint. The reaction cavity 19 is communicated with the welding cavity 20 through a diversion trench 21, an isolation gasket 22 is arranged at the bottom of the reaction cavity 19, a first through hole 23 is formed in the isolation gasket 22, and the welding solution flows into the diversion trench 21 through the first through hole in the isolation gasket 22 and enters the welding cavity 20 along the diversion trench 21. The welding cavity 20 is provided with a second through hole 24 with the left end and the right end communicated with each other, and the second through hole 24 is used for accommodating the joint end of the first copper core and the joint end of the second copper core.

Furthermore, the left side and the right side of the groove 17 are communicated, and the groove 17 is communicated with the outside to provide sufficient oxygen for high-temperature reaction generated by the reaction cavity.

Furthermore, the aperture of the first through hole is the same as the inner diameter of the guide groove, so that the welding solution can conveniently flow into the welding cavity along the guide groove.

Furthermore, the reaction cavity is of an inverted round platform structure with a large upper end opening and a small lower end opening, and the structure with the large upper end and the small lower end facilitates full reaction of the welding flux and flowing into the welding cavity under the action of gravity.

The working process of the graphite mold comprises the following steps:

after the graphite mold is ensured to be dry, the joint ends of the first copper core and the second copper core to be welded are placed into the welding cavity through the second through hole, the isolation gasket is placed at the bottom of the reaction cavity, welding powder is placed into the reaction cavity, the ignition powder is scattered on the surface of the welding powder and on the lip edges of the side edges of the grooves of the graphite mold, the cover is closed, the ignition powder is ignited by a flint igniter, and the reacted welding powder flows into the welding cavity through the diversion grooves to weld the cable copper core to form the copper core welding head.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a cable welded joint, includes copper core welded joint (1), its characterized in that: the copper core welding head is formed by fusion connection of a first copper core (2) and a second copper core (3) in a left-right mode, the outer surface of the copper core welding head is sequentially wrapped with an inner shielding recovery layer (9), a main insulation recovery layer (10), an outer shielding recovery layer (11), a steel armor recovery layer (12) and an outer sheath recovery layer (13), the left end and the right end of the inner shielding recovery layer (9) are connected with an inner shielding layer (4), the left end and the right end of the main insulation recovery layer are connected with a main insulation layer (5), the left end and the right end of the outer shielding recovery layer are connected with an outer shielding layer (6), the left end and the right end of the steel armor recovery layer are connected with a steel armor layer (7), and the left end and the right end of the outer sheath recovery layer are connected with an outer sheath layer (8);

copper core fusion splice uses graphite jig (14) to make, graphite jig (14) include mould body (15) and lid (16) that are provided with recess (17), lid (16) with mould body (15) are connected through hinge (18), mould body upper portion is equipped with reaction chamber (19), mould body (15) lower part is equipped with welding chamber (20), reaction chamber (19) with welding chamber (20) communicate through guiding gutter (21), the reaction chamber bottom is equipped with isolating pad (22), isolating pad (22) are equipped with through-hole one (23), the welding chamber is equipped with two (24) of through-hole of controlling both ends intercommunication, two through-holes are used for holding first copper core and second copper core tip.

2. A cable fusion splice according to claim 1, in which: the first copper core (2) and the second copper core (3) are connected in a melting mode through exothermic welding.

3. A cable fusion splice according to claim 1, in which: the circumferential diameter of the copper core welding head (1) is equal to the circumferential diameter of the first copper core (2) or the second copper core (3).

4. A cable fusion splice according to claim 1, in which: the main insulation recovery layer (10) is made of XLPE material and is the same as the main insulation layer (5), the inner shielding recovery layer (9) is made of the same material as the inner shielding layer (4), and the outer shielding recovery layer (11) is made of the same material as the outer shielding layer (6).

5. A cable fusion splice according to claim 1, in which: the left side and the right side of the groove (17) are communicated.

6. A cable fusion splice according to claim 1, in which: the aperture of the first through hole (23) is the same as the inner diameter of the diversion trench (21).

7. A cable fusion splice according to claim 1, in which: the reaction cavity (19) is of an inverted round table structure with a large upper end opening and a small lower end opening.