CN207116729U - A kind of reducing cable core joint - Google Patents

Abstract

The utility model discloses a cable core joint with different diameters, which comprises: a conductor, a conductor shielding layer, two body insulation layers, a reinforced insulation layer and an insulation shielding layer, and the conductor shielding layer is wrapped with a cross-linkable EVA semi-conductive tape On the surface of the conductor, the conductor shielding layer is overlapped with the conductor shielding; the two body insulating layers are symmetrically installed on the conductor shielding layer, and the two body insulating layers are made into reaction force cones; The insulating shielding layer is installed on the surface of the body insulating layer; the reinforced insulating layer is installed in the space surrounded by the insulating shielding layer, the conductor shielding layer and the body insulating layer. Through the above method, the utility model provides a different-diameter cable core joint, which improves the operation stability and service life of the product, can realize the connection of the cable core with high strength and low resistance, improves the performance of the product, and has a compact structure, It occupies a small space and is suitable for various environments where the cables are located.

Description

A cable core connector with different diameters

technical field

The utility model belongs to the field of cross-linked polyethylene insulated cable intermediate joints, in particular to a cable core joint with different diameters.

Background technique

With the continuous development and expansion of the city scale, the demand for electric energy is increasing rapidly. As an important component for connecting power cables, the number of cable intermediate joints is naturally increasing year by year. The common cable intermediate joints mainly include: wrapping type, heat shrinkable type, cold shrinkable type and prefabricated type, etc.

Due to the extension of cable lines, transformation of distribution network and voltage upgrade, etc., it is often encountered that cables of different cross-sections are connected to each other, resulting in the demand for intermediate joints with different diameters. For example, due to the need to bypass some new buildings, cables need to be added to the laid cable circuit, and there may be differences in the type of new and old cables, the outer diameter of the insulation, etc.; Phenomena such as different insulation outer diameters at both ends of the connection may occur.

At present, due to different conductor cross-sections or different cable voltage levels, the main insulation outer diameter is different, mainly through the use of crimped different-diameter conductor transition connection tubes, and then using cold-shrinkable accessories or combined prefabricated accessories to complete the intermediate joint connection. Such a treatment method often has problems such as increased contact resistance at the conductor connection, poor mechanical properties at the joint, and poor system sealing.

Utility model content

The technical problem mainly solved by the utility model is to provide a cable core joint with different diameters, which can improve the operation stability and service life of the product.

In order to solve the above technical problems, a technical solution adopted by the utility model is: a cable core joint with different diameters, which is characterized in that it includes: a conductor, a conductor shielding layer, two body insulation layers, a reinforced insulation layer and an insulation shielding layer, The conductor shielding layer is wrapped on the surface of the conductor with a cross-linkable EVA semi-conductive tape, and the conductor shielding layer overlaps with the original conductor shielding;

The two body insulating layers are symmetrically installed on the conductor shielding layer, a distance is set between the body insulating layers, and the two body insulating layers are made into reaction force cones, that is, at the opposite sides The end is cut into a "pencil head" shape;

The insulating shielding layer is installed on the surface of the body insulating layer;

The reinforced insulation layer is installed in the space enclosed by the insulation shielding layer, the conductor shielding layer and the body insulation layer;

The insulating shielding layer is wrapped on the surface of the reinforced insulating layer with a cross-linkable EVA semi-conductive tape, and the insulating shielding layer overlaps with the reinforced insulating layer and the body insulating layer.

In a preferred embodiment of the present invention, the conductors are brazed with single-wire dislocation silver.

In a preferred embodiment of the present invention, the thickness of the reinforced insulation layer is greater than the thickness of the body insulation layer.

In a preferred embodiment of the present invention, the conductors include the same conductor structure and different conductor structures.

In a preferred embodiment of the present invention, the length of the conductor monofilament of the outermost layer of the conductor with larger specifications in different conductor structures should exceed the second outer layer by about 5-10 cm, and the length of the outermost conductor monofilament of the other said conductor should be about 5-10 cm. The wire is brazed with lap joint silver, and the lap joints are smoothed by polishing and grinding.

The beneficial effects of the utility model are: the utility model is a different-diameter cable core joint, which improves the operation stability and service life of the product, can realize the high-strength and low-resistance connection of the cable core, and improves the performance of the product. Moreover, it has a compact structure and a small footprint, and is suitable for various environments where the cable is located.

Description of drawings

Fig. 1 is a structural schematic diagram of the same conductor structure of a different-diameter cable core joint.

Fig. 2 is a schematic diagram of different conductor structures of a cable core joint with different diameters.

The marks of the components in the drawings are as follows: 1. Conductor; 2. Conductor shielding layer; 3. Body insulation layer; 4. Reinforced insulation layer; 5. Insulation shielding layer; 6. Welding point; 7. Lap joint.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and characteristics of the utility model can be more easily understood by those skilled in the art, so that the protection scope of the utility model can be defined more clearly .

Please refer to Fig. 1 and Fig. 2, the utility model embodiment comprises:

Example 1

In the same conductor structure, a cable core joint with different diameters is characterized by comprising: a conductor 1, a conductor shielding layer 2, two body insulating layers 3, a reinforced insulating layer 4 and an insulating shielding layer 5.

After the conductor 1 is centered, it is unfolded layer by layer, and single-wire dislocation silver brazing is used. The single-wires of each layer are not welded to death, which can effectively ensure the flexible connection of the conductor 1. The conductivity of silver is better than that of copper. , so the resistance of the weld 6 is small, which solves the problem of the thermal field of the intermediate joint.

The conductor shielding layer 2 is wrapped on the surface of the conductor 1 with a cross-linkable EVA semi-conductive tape, the conductor shielding layer 2 is overlapped with the conductor 1 shielding, and then the material is tightly bonded by mold pressing and heating. combined on the surface of the conductor 1.

The two body insulating layers 3 are symmetrically installed on the conductor shielding layer 2, and a distance is provided between the body insulating layers 3, and the two body insulating layers 3 are made into reaction force cones, that is, between the two body insulating layers 3 The opposite ends of the insulating layer 3 are cut into a "pencil head" shape, so as to make the electric field evenly distributed and reduce the axial field intensity.

The insulation shielding layer 5 is installed on the surface of the body insulation layer 3 .

The reinforced insulating layer 4 is installed in the space surrounded by the insulating shielding layer 5, the conductor shielding layer 2 and the body insulating layer 3, and the reinforced insulating layer 4 is heated to After melting at 120°C, keep the temperature in the molten state and inject the mold into the body insulation layer 3 to integrate, and then go through 200°C vulcanization and cross-linking for 8 hours, degassing, and cooling. 3 is consistent with the surface structure of the conductor shielding layer 2, the reinforced insulating layer 4 is combined with the bulk insulating layer 3 at the molecular level, there is no assembly interface, and the system is well sealed.

The thickness of the reinforced insulation layer 4 is greater than that of the body insulation layer 3 , ensuring sufficient safety margin.

The insulating shielding layer 5 is wrapped on the surface of the reinforced insulating layer 4 with a cross-linkable EVA semi-conductive tape, and the insulating shielding layer 5 is shielded and overlapped with the reinforced insulating layer 4 and the body insulating layer 3, and then The materials are tightly adhered to the surface of the reinforced insulating layer 4 and the body insulating layer 3 through mold pressing and heating, and the overall structure is compact and consistent with the surface structure of the reinforced insulating layer 4 and the body insulating layer 3 , The electrical and mechanical properties are excellent, which effectively improves the service life of the intermediate joint and the safety and stability of operation.

Example 2

Among the different conductor structures, the length of the outermost conductor monofilament of the conductor 1 with a larger specification should exceed the second outer layer by 5-10 cm, and the outermost conductor monofilament of the other conductor 1 should be brazed with overlapping silver, and Smoothing treatments such as polishing and grinding are performed on the overlapping joint 7 .

A cable core joint with different diameters is characterized by comprising: a conductor 1, a conductor shielding layer 2, two body insulating layers 3, a reinforced insulating layer 4 and an insulating shielding layer 5.

After the conductor 1 is centered, it is unfolded layer by layer, and single-wire dislocation silver brazing is used. The single-wires of each layer are not welded to death, which can effectively ensure the flexible connection of the conductor 1. The conductivity of silver is better than that of copper. , so the resistance of the weld 6 is small, which solves the problem of the thermal field of the intermediate joint.

The conductor shielding layer 2 is wrapped on the surface of the conductor 1 with a cross-linkable EVA semi-conductive tape, the conductor shielding layer 2 is overlapped with the conductor 1 shielding, and then the material is tightly bonded by mold pressing and heating. combined on the surface of the conductor 1.

The two body insulating layers 3 are symmetrically installed on the conductor shielding layer 2, and a distance is provided between the body insulating layers 3, and the two body insulating layers 3 are made into reaction force cones, that is, between the two body insulating layers 3 The opposite ends of the insulating layer 3 are cut into a "pencil head" shape, so as to make the electric field evenly distributed and reduce the axial field intensity.

The insulation shielding layer 5 is installed on the surface of the body insulation layer 3 .

The reinforced insulating layer 4 is installed in the space surrounded by the insulating shielding layer 5, the conductor shielding layer 2 and the body insulating layer 3, and the reinforced insulating layer 4 is heated to After melting at 120°C, keep the temperature in the molten state and inject the molding mold into one body with the body insulating layer 3, and then remove the mold after vulcanization, cross-linking, degassing, and cooling at 2000°C to realize the integration with the body insulating layer 3 Consistent with the surface structure of the conductor shielding layer 2, the reinforced insulating layer 4 and the body insulating layer 3 are combined at a molecular level, there is no assembly interface, and the system is well sealed.

The thickness of the reinforced insulation layer 4 is greater than that of the body insulation layer 3 , ensuring sufficient safety margin.

The insulating shielding layer 5 is wrapped on the surface of the reinforced insulating layer 4 with a cross-linkable EVA semi-conductive tape, and the insulating shielding layer 5 is shielded and overlapped with the reinforced insulating layer 4 and the body insulating layer 3, and then The materials are tightly adhered to the surface of the reinforced insulating layer 4 and the body insulating layer 3 through mold pressing and heating, and the overall structure is compact and consistent with the surface structure of the reinforced insulating layer 4 and the body insulating layer 3 , The electrical and mechanical properties are excellent, which effectively improves the service life of the intermediate joint and the safety and stability of operation.

Compared with the prior art, the utility model is a different-diameter cable core joint, which improves the operation stability and service life of the product, can realize the high-strength and low-resistance connection of the cable core, and improves the performance of the product. With compact structure and small footprint, it is suitable for various environments where cables are located.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (5)

1. A kind of 1. reducing cable core joint, it is characterised in that including：Conductor, conductor shield, two body insulating barriers, reinforcement Insulating barrier and insulation screen, the conductor shield is wrapped in the conductive surface using cross-linking EVA semi-conductive tapes, described Conductor shield overlaps with the former conductor shielding；

   The two body insulating barriers are symmetrically installed on the conductor shield, and spacing is provided between the body insulating barrier, The two body insulating barriers are fabricated to reagency cone, i.e., cut into " pencil stub " shape in the relative end of the two body insulating barriers Shape；

   The insulation screen is arranged on the body surface of insulating layer；

   The reinforced insulation layer is arranged on the sky that the insulation screen, the conductor shield and the body insulating barrier surround In；

   The insulation screen is wrapped in the reinforced insulation layer surface, the insulation shielding using cross-linking EVA semi-conductive tapes Layer overlaps with the reinforced insulation layer and body insulating barrier shielding.
2. A kind of 2. reducing cable core joint according to claim 1, it is characterised in that：The conductor is misplaced using monofilament Silver brazing connects.
3. A kind of 3. reducing cable core joint according to claim 1, it is characterised in that：The thickness of the reinforced insulation layer More than the thickness of the body insulating barrier.
4. A kind of 4. reducing cable core joint according to claim 1, it is characterised in that：The conductor includes same conductor Structure and different conductor structure.
5. A kind of 5. reducing cable core joint according to claim 4, it is characterised in that：In different conductor structure specification compared with The big conductor outermost layer conductor filament length should exceed time 5 ~ 10cm of outer layer, with another conductor outermost layer conductor monofilament Polished and grinding process using overlap joint silver brazing, and in lap-joint.