CN215772513U

CN215772513U - Interior waterproof type shrinkage intermediate head

Info

Publication number: CN215772513U
Application number: CN202122232622.5U
Authority: CN
Inventors: 曾恕金; 侯琦; 吕玉春; 吴春玲; 陈朝晖
Original assignee: Guangdong Gca Cable Accessory Co ltd
Current assignee: Guangdong Gca Cable Accessory Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-02-08
Anticipated expiration: 2031-09-15

Abstract

The utility model provides an internal waterproof cold-shrink intermediate joint which is used for connecting cables at two ends; the cold-contraction middle joint comprises a cold-contraction middle joint main insulator, a crimping type connecting pipe, a conductive flexible silica gel belt and an insulating flexible silica gel belt; two ends of the compression joint type connecting pipe are provided with two non-communicated cavities, and the compression joint type connecting pipe is connected with the wire cores of the cables at the two ends through the two cavities respectively; the conductive flexible silica gel belt is coated on the wire core of the cable, the compression joint type connecting pipe and the inner semi-conducting layer of the cable; the insulating flexible silica gel belt is coated on the conductive flexible silica gel belt and the insulating reaction force cone of the cable; and the cold-contraction intermediate joint main insulator is sleeved on the insulating flexible silica gel belt, the insulating layer of the cable and the outer semi-conducting layer of the cable. This shrinkage intermediate head can prevent effectively that moisture or steam from permeating between intermediate head and the cable insulation layer from the cable core to greatly reduced intermediate head's fault rate promotes power cable system's operational reliability.

Description

Interior waterproof type shrinkage intermediate head

Technical Field

The utility model relates to the technical field of power cable accessories, in particular to an internal waterproof cold-shrink intermediate joint.

Background

With the acceleration of the urbanization process, the middle and low voltage power cable connectors are applied more and more, and the cold-shrinkage type intermediate connector is widely used due to the advantages of convenience in installation, no need of fire operation, the same breath as the cable and the like. The cable and the intermediate joint used in the power system are soaked in water for a large part of time during operation, and the short-circuit fault of the cable system caused by water inlet breakdown of the intermediate joint becomes a main cause of the fault of the cable system.

At the present stage, the water inflow of the intermediate joint mainly has two aspects: firstly, the water gradually enters the interior of the intermediate joint from the fracture of the cable outer sheath, which is commonly called as 'external water inlet'; and secondly, the cable core gradually penetrates from the port of the inner semi-conducting layer of the cable to the interface between the intermediate joint and the insulation of the cable body, which is commonly called as 'internal water inlet'. At present, the external waterproof sealing design of the intermediate joint is mature, and the possibility of water entering the cable from the outside is lower and lower. For the internal water inlet of the intermediate joint, no effective waterproof sealing design is researched at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide the inner waterproof type cold-shrink intermediate joint which can effectively prevent moisture or steam from permeating between the intermediate joint and a cable insulating layer from a cable core, thereby greatly reducing the failure rate of the intermediate joint and improving the operation reliability of a power cable system.

In order to achieve the purpose, the utility model is realized by the following technical scheme: an inner waterproof type cold-contraction middle joint is used for connecting cables at two ends; the method is characterized in that: the cold-shrinkage intermediate joint comprises a cold-shrinkage intermediate joint main insulator, a compression joint type connecting pipe, a conductive flexible silica gel belt and an insulating flexible silica gel belt; two ends of the compression joint type connecting pipe are provided with two non-communicated cavities, and the compression joint type connecting pipe is connected with the wire cores of the cables at the two ends through the two cavities respectively; the conductive flexible silica gel belt is coated on the wire core of the cable, the compression joint type connecting pipe and the inner semi-conducting layer of the cable; the insulating flexible silica gel belt is coated on the conductive flexible silica gel belt and the insulating reaction force cone of the cable; and the cold-contraction intermediate joint main insulator is sleeved on the insulating flexible silica gel belt, the insulating layer of the cable and the outer semi-conducting layer of the cable.

In the scheme, the internal waterproof structure of the internal waterproof cold-shrinkage intermediate joint is reasonable in design, and the crimping type connecting pipe prevents accumulated water or water vapor from being directly transmitted from the wire core of the cable at one end to the wire core of the cable at the other end. The conductive flexible silica gel belt and the insulating flexible silica gel belt have excellent cohesiveness and can be firmly bonded on an insulating reaction force cone of the cable (namely the surface of an insulating layer of the cable), so that a closed space is formed inside the insulating flexible silica gel belt, and even if accumulated water or steam exists in a cable core of the cable, the accumulated water or steam cannot enter an interface between a main insulator of the cold-shrinkage intermediate joint and the insulating layer of the cable through an inner semi-conductive layer port of the cable, and the internal waterproof function of the intermediate joint is realized. Meanwhile, the insulating flexible silica gel belt is softer, the surface layer of the insulating flexible silica gel belt can be firmly bonded with the main insulator of the cold-shrink intermediate joint to form a gapless interface, and the cold-shrink intermediate joint is ensured to safely and stably run.

And the cold-contraction intermediate joint main insulator is prepared and molded by adopting liquid silicone rubber.

The surface of the cold-contraction intermediate joint main insulator is coated with an outer shielding layer.

And a stress cone is arranged between the cold-shrinkage intermediate joint main insulator and the outer semi-conducting layer of the cable.

The cold-contraction middle joint main insulator, the outer shielding layer and the stress cone are of an integrated prefabricated structure.

The crimping type connecting pipe is an oil blocking type crimping type connecting pipe.

The conductive flexible silica gel belt is prepared from carbon black, metal powder and a flexible silica gel material.

The cable comprises a wire core and an inner semi-conducting layer coated on the wire core; the surface of the inner semi-conducting layer is sequentially coated with an insulating layer and an outer semi-conducting layer.

The end of the insulating layer is cut to form an insulating reaction force cone.

Compared with the prior art, the utility model has the following advantages and beneficial effects: the internal waterproof cold-shrinkage intermediate joint can effectively prevent moisture or steam from permeating between the intermediate joint and a cable insulating layer from a cable core, thereby greatly reducing the failure rate of the intermediate joint and improving the operation reliability of a power cable system.

Drawings

FIG. 1 is an internal schematic view of an internal waterproof cold-shrink intermediate joint of the present invention;

FIG. 2 is a schematic cross-sectional view of an inner waterproof structure in the inner waterproof type cold-shrink intermediate joint of the present invention;

wherein, 1 is a stress cone, 2 is a cold-shrinkage intermediate joint main insulator, 3 is an outer shielding layer, 4 is an oil-blocking type crimping connecting pipe, 5 is a conductive flexible silica gel tape, 6 is an insulating flexible silica gel tape, 7 is an insulating reaction force cone, 8 is a wire core, 9 is an inner semi-conducting layer, 10 is an insulating layer, and 11 is an outer semi-conducting layer.

Detailed Description

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

Examples

As shown in fig. 1 and 2, the internal waterproof cold-shrink intermediate joint of the present invention is used for connecting cables at two ends, and includes a cold-shrink intermediate joint main insulator 2, an oil-blocking crimp-type connecting pipe 4, a conductive flexible silica gel tape 5 and an insulating flexible silica gel tape 6, wherein two ends of the oil-blocking crimp-type connecting pipe 4 are provided with two non-communicated cavities, the oil-blocking crimp-type connecting pipe 4 is connected with the cores 8 of the cables at two ends through the two cavities, the conductive flexible silica gel tape 5 is coated on the cores 8 of the cables, the oil-blocking crimp-type connecting pipe 4 and the inner semi-conductive layer 9 of the cables, and the insulating flexible silica gel tape 6 is coated on the conductive flexible silica gel tape 5 and the insulating reaction force cone 7 of the cables. The main insulator 2 of the cold-shrink intermediate joint is sleeved on an insulating flexible silica gel belt 6, an insulating layer 10 of a cable and an outer semi-conducting layer 11 of the cable.

Specifically, the cables at both ends respectively include a core 8 and an inner semiconductive layer 9 coated on the core 8, the surface of the inner semiconductive layer 9 is sequentially coated with an insulating layer 10 and an outer semiconductive layer 11, and the end of the insulating layer 10 is cut to form an insulation reaction force cone 7.

The cold-shrinkage intermediate joint main insulator 2 of the internal waterproof cold-shrinkage intermediate joint is prepared and molded by adopting liquid silicon rubber, the surface of the cold-shrinkage intermediate joint main insulator is coated with an outer shielding layer 3, and a stress cone 1 is arranged between the cold-shrinkage intermediate joint main insulator 2 and an outer semi-conducting layer 11 of a cable. In the use, shrinkage intermediate head main insulator 2, outer shielding layer 3 and stress awl 1 are integrative prefabricated profiled structure, can directly with this integrative prefabricated profiled structure suit to the cladding have the cable of insulating flexible silica gel area 6 on.

The conductive flexible silica gel belt 5 is prepared from carbon black, metal powder and a flexible silica gel material.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. An inner waterproof type cold-contraction middle joint is used for connecting cables at two ends; the method is characterized in that: the cold-shrinkage intermediate joint comprises a cold-shrinkage intermediate joint main insulator, a compression joint type connecting pipe, a conductive flexible silica gel belt and an insulating flexible silica gel belt; two ends of the compression joint type connecting pipe are provided with two non-communicated cavities, and the compression joint type connecting pipe is connected with the wire cores of the cables at the two ends through the two cavities respectively; the conductive flexible silica gel belt is coated on the wire core of the cable, the compression joint type connecting pipe and the inner semi-conducting layer of the cable; the insulating flexible silica gel belt is coated on the conductive flexible silica gel belt and the insulating reaction force cone of the cable; and the cold-contraction intermediate joint main insulator is sleeved on the insulating flexible silica gel belt, the insulating layer of the cable and the outer semi-conducting layer of the cable.

2. The internally waterproof cold-shrink intermediate joint according to claim 1, characterized in that: and the cold-contraction intermediate joint main insulator is prepared and molded by adopting liquid silicone rubber.

3. The internally waterproof cold-shrink intermediate joint according to claim 1, characterized in that: the surface of the cold-contraction intermediate joint main insulator is coated with an outer shielding layer.

4. The internally waterproof cold-shrink intermediate joint according to claim 3, characterized in that: and a stress cone is arranged between the cold-shrinkage intermediate joint main insulator and the outer semi-conducting layer of the cable.

5. The internally waterproof cold-shrink intermediate joint according to claim 4, characterized in that: the cold-contraction middle joint main insulator, the outer shielding layer and the stress cone are of an integrated prefabricated structure.

6. The internally waterproof cold-shrink intermediate joint according to claim 1, characterized in that: the crimping type connecting pipe is an oil blocking type crimping type connecting pipe.

7. The internally waterproof cold-shrink intermediate joint according to claim 1, characterized in that: the conductive flexible silica gel belt is prepared from carbon black, metal powder and a flexible silica gel material.

8. The internal waterproof cold-shrink intermediate joint according to any one of claims 1 to 7, wherein: the cable comprises a wire core and an inner semi-conducting layer coated on the wire core; the surface of the inner semi-conducting layer is sequentially coated with an insulating layer and an outer semi-conducting layer.

9. The internally waterproof cold-shrink intermediate joint according to claim 8, characterized in that: the end of the insulating layer is cut to form an insulating reaction force cone.