CN215733429U

CN215733429U - Non-fusion connection fireproof cable joint

Info

Publication number: CN215733429U
Application number: CN202120786198.6U
Authority: CN
Inventors: 林培斌; 刘效洲; 马沁柠
Original assignee: Guangdong Anheng Power Technology Co ltd
Current assignee: Guangdong Herui Power Service Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2022-02-01
Anticipated expiration: 2031-04-16

Abstract

The utility model discloses a non-melting connection fireproof cable joint which comprises a copper sleeve, an insulating layer, a waterproof layer and an outer sheath, wherein a first cable core and a second cable core to be connected are installed in the copper sleeve, the copper sleeve and the first cable core and the second cable core are in interference fit, the insulating layer wraps the copper sleeve, the first cable core and the second cable core, and the waterproof layer and the outer sheath are sequentially arranged on the outer layer of the insulating layer. The joint of this design has advantages such as good fire behavior, mechanical protection, to the buffer protection of insulating layer and cable core, radial seal dampproofing and waterproofing, short-circuit current switches on during the trouble, vertical water-blocking under the unexpected condition.

Description

Non-fusion connection fireproof cable joint

Technical Field

The utility model relates to the technical field of power grid construction, in particular to a non-fusion connection fireproof cable joint.

Background

With the development of power grids and the improvement of urban networks, the occupied proportion of cables in power grid lines is increasing day by day, the corresponding fault rate of the cables is also increasing continuously, the cables must be reconnected to recover power supply under the condition of breakage, and at present, a prefabricated cable intermediate joint is mostly combined and sleeved on a cable main body on site to recover the connection of the two cables. However, most wire cores of the connector are mechanically connected in a compression joint or bolt twisting mode, the contact resistance of the connection part is large, heating is easily caused, cable overload is easily caused after long-time high-voltage use, and even a large accident is caused by heating and explosion of a cable middle connector. Meanwhile, the existing cable joint is poor in waterproofness generally.

In view of the above technical problems, the chinese utility model patent publication No. 210110386U discloses a waterproof and fireproof cable, which includes a conductor, a conductor shielding layer, an insulating layer, a shielding layer, a metal shielding layer, a waterproof layer, a fireproof layer, an armor layer and a sheath, which are sequentially arranged from the inside to the outside; the waterproof layer comprises a semiconductive water-blocking belting layer, an aluminum-plastic composite belting layer and a high-density polyethylene layer; the semiconductive water-blocking belting layer is wrapped outside the metal shielding layer, the aluminum-plastic composite belting layer is longitudinally wrapped outside the semiconductive water-blocking belting layer, and the high-density polyethylene layer is extruded and molded outside the aluminum-plastic composite belting layer and is fixedly connected with the aluminum-plastic composite belting layer into a whole; the fire-proof layer comprises a halogen-free low-smoke high-flame-retardant polyolefin fire-proof layer. By providing a waterproof layer and a fireproof layer, both waterproof and fireproof properties can be achieved.

However, such a cable structure is relatively complicated and is difficult to implement in the actual cable joint construction work. In addition, the existing cable joint installation process has the problems of difficult construction and long construction period due to the need of using a special welding device, and in the society of high-speed development at present, the cable fault easily brings huge economic loss to people, so that how to quickly construct the cable and repair the cable fault becomes the problem of great importance in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a non-fusion connection fireproof cable joint structure which can be conveniently installed and has good fireproof performance.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a non-melting connects fireproof cable connects, includes copper sheathing, insulating layer, waterproof layer and oversheath, two first cable cores and the second cable core of treating the connection of installation in the copper sheathing, the copper sheathing with adopt interference fit between first cable core and the second cable core, make the inner wall of copper sheathing with the outer wall of first cable core and second cable core closely laminates, and the electric conductive property of guaranteeing to connect the department is good, the insulating layer parcel copper sheathing, first cable core and second cable core, waterproof layer and oversheath set gradually the skin of insulating layer.

Furthermore, the interference magnitude of the first cable core, the second cable core and the copper sleeve is 0-0.02 mm.

Furthermore, the copper sleeve and the first cable core and the second cable core are positioned and fixed through a plurality of rivets, so that the joint is firmer.

Furthermore, the surface of copper sheathing still is provided with temperature sensor, carries out real time monitoring to the operating temperature of copper sheathing (especially first cable core and second cable core joint department), guarantees the cable safety, but the connection alarm system, if surpass safe temperature can the police dispatch newspaper, reaches the fire prevention purpose.

Furthermore, two ends of the copper sleeve are respectively fixed with the first cable core and the second cable core through brazing, and the area of the brazing position is not less than 1cm²。

Furthermore, the copper sleeve can be replaced by a silver sleeve or an aluminum sleeve according to the requirement of the electric conductivity, so that the first cable core and the second cable core are matched. Similarly, the rivet can also be made of copper, silver, aluminum or other metals with excellent conductive performance.

Furthermore, the insulating layer is made of cross-linked polyethylene (XLPE), which is a network structure after cross-linking, and the structure has strong deformation resistance even at high temperature. The cross-linked polyethylene has excellent electrical performance, the dielectric loss is less than that of polyvinyl chloride (PVC) insulation, and the cable made of the cross-linked polyethylene is easy to lay.

Further, the waterproof layer adopts waterproof adhesive tape or waterproof plastic cloth to wind the package and forms, the thickness of waterproof layer is between 0.2 ~ 2mm, and the waterproof layer is used for improving water-proof effects, stops the short circuit and produces the explosion.

Further, the outer sheath is made of polyethylene or polyvinyl chloride.

The utility model has the beneficial effects that: the cable joint structure that non-melting of this design is connected adopts two cable joint of copper sheathing connection, insert two cable cores of treating to connect towards the copper sheathing both ends during the installation, rethread rivet location, it is fixed at the copper sheathing both ends brazing at last, high durability and convenient installation, need not to borrow special hot melt equipment, and the work efficiency is improved, in addition, still be provided with waterproof adhesive tape or waterproof plastic cloth at joint department around the waterproof layer that the package formed, set up wrinkle aluminium sheath and oversheath outside the waterproof layer, make cable joint structure have good waterproof and fireproof performance, mechanical protection, buffer protection to insulating layer and cable core, radial seal dampproofing and waterproofing, short-circuit current switches on during the trouble, advantages such as vertical blocking water under the unexpected condition.

Drawings

Fig. 1 is a sectional view of the overall structure of the present invention.

Detailed Description

The utility model will be further described with reference to the accompanying drawings. The copper sheathing in this embodiment also can adopt replacement such as silver cover or aluminium cover according to electric conductive property needs to the material of first cable core of cooperation and second cable core is suitable. Similarly, the rivet may be made of copper, silver, aluminum, or the like.

A non-fusion connection fireproof cable joint is shown in figure 1 and comprises a copper sleeve 2, an insulating layer 3, a shielding layer 4, a waterproof layer 5, a corrugated aluminum sheath 6 and an outer sheath 7, wherein two first cable cores 11 and two second cable cores 12 to be connected are installed in the copper sleeve 2, and the copper sleeve 2 is in interference fit with the first cable cores 11 and the second cable cores 12, so that the inner wall of the copper sleeve 2 is tightly attached to the outer walls of the first cable cores 11 and the second cable cores 12; insulating layer 3 parcel copper sheathing 2, first cable core 11 and second cable core 12, shielding layer 4, waterproof layer 5, wrinkle aluminium sheath 6 and oversheath 7 set gradually the skin of insulating layer 3. The insulating layer 3 is made of cross-linked polyethylene (XLPE), the cross-linked polyethylene is of a net structure after cross-linking, the structure has very strong deformation resistance even at high temperature, the cross-linked polyethylene has excellent electrical performance, the dielectric loss is smaller than that of polyvinyl chloride (PVC) insulation, and a cable made of the cross-linked polyethylene is easy to lay. The shielding layer 4 is shielded by a copper strip. The waterproof layer 5 is formed by wrapping waterproof adhesive tapes or waterproof plastic cloth, wherein the thickness of the waterproof layer is 0.2-2 mm, the waterproof layer is used for improving the waterproof effect and preventing short circuit from explosion, and the optimal thickness of the waterproof layer is 0.8-1 mm or 1.3-1.6 mm; the outer sheath 7 is made of polyethylene or polyvinyl chloride, and a corrugated aluminum sheath 6 is arranged between the waterproof layer 5 and the outer sheath 7.

Furthermore, two ends of the copper sleeve 2 are respectively fixed with the first cable core 11 and the second cable core 12 by brazing, and the area of a brazed part 21 is not less than 1cm². For making the joint design more firm, copper sheathing 2 with still can fix a position and fix through a plurality of rivets 22 between first cable core 11 and the second cable core 12, wherein, rivet 22 is encircleing the copper sheathing is radial symmetric distribution, and every row of rivet 22 counts and is 3 ~ 6, and row number 4 ~ 8 rows, rivet 22's diameter is preferred 2 ~ 5 mm.

Further, the length of the copper sleeve 2 is set to be 5-10 times of the diameter of the first cable core 11 and the second cable core 12, and the thickness of the copper sleeve 2 is set to be 0.5-1 time of the diameter of the first cable core 11 and the second cable core 12.

Furthermore, the interference of the first cable core 11 and the second cable core 12 with the copper sheath 2 is 0-0.02 mm, preferably-0.005-0.013 mm, and the installation is convenient.

Further, the outer surface of the copper sleeve 2 can be provided with a temperature sensor 8, the working temperature of the copper sleeve 2 (especially the joint of the first cable core 11 and the second cable core 12) is monitored in real time, the safety of the cable is ensured, an alarm system can be connected, and if the working temperature exceeds the safety temperature, an alarm can be given, so that the fireproof purpose is achieved.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made in the claims and the description of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a fire prevention cable joint is connected to non-melting, its characterized in that, including copper sheathing, insulating layer, waterproof layer and oversheath, two first cable cores and the second cable core of treating the connection of installation in the copper sheathing, the copper sheathing with adopt interference fit between first cable core and the second cable core, the insulating layer parcel copper sheathing, first cable core and second cable core, waterproof layer and oversheath set gradually the skin of insulating layer.

2. The non-fused fire-resistant cable joint according to claim 1, wherein the copper sheath is positioned and secured to the first cable core and the second cable core by rivets.

3. The non-fused connecting fireproof cable joint according to claim 1, wherein the two ends of the copper sheath are fixed to the first cable core and the second cable core by soldering.

4. A non-fusion splicing flameproof cable connector according to any of claims 1 to 3, wherein the copper sheath is a silver or aluminium sheath.

5. A non-fusion splicing flameproof cable connector according to any of claims 1 to 3, wherein the outer surface of the copper sheath is provided with a temperature sensor.

6. The non-fusion splicing flameproof cable coupling of claim 1, wherein the insulating layer is formed of cross-linked polyethylene and the outer jacket is formed of polyethylene or polyvinyl chloride.

7. The non-fused fire-resistant cable joint according to claim 1 or 6, wherein the waterproof layer is formed by wrapping waterproof adhesive tape or waterproof plastic cloth.

8. The non-fused connecting fireproof cable joint according to claim 7, wherein the waterproof layer has a thickness of 0.2-2 mm.

9. The non-fused connecting fireproof cable joint according to claim 7, wherein the waterproof layer has a thickness of 0.8 to 1 mm.

10. The non-fused connecting fireproof cable joint according to claim 7, wherein the waterproof layer has a thickness of 1.3 to 1.6 mm.