Power cable cold shrinkage intermediate joint

Abstract

The utility model relates to the technical field of cold-contraction cable joints, in particular to a power cable cold-contraction intermediate joint, which comprises a joint pipe, a shielding net is mounted in the pipe wall of the joint pipe, an insulating layer is mounted in the middle of the inner wall of the joint pipe, and a plurality of high-temperature-resistant sleeves which are uniformly arrayed are mounted on the inner wall of the insulating layer. Shielding contact sleeves are installed on the inner sides of the two ends of the inner wall of the connector pipe, sealing sleeves are installed on the outer sides of the two ends of the inner wall of the connector pipe, and the outer surface of the connector pipe is coated with a shielding coating. The cable joint has the advantages that the shielding net is filled in the joint pipe, and the shielding contact sleeves are arranged on the inner sides of the two ends in the joint pipe and are connected with the shielding net, so that after two cables extend into the joint pipe, the shielding contact sleeves are in contact with the cables to form a loop and play a role in shielding electric signals; the insulating layer is installed in the middle of the interior of the joint pipe, and the insulating layer can block electrical conduction of the cable, so that the cold contraction joint is not conductive.

Description

A cold shrink joint for power cables Technical Field

[0001] This utility model relates to the field of cold shrink cable joint technology, and in particular to a cold shrink intermediate joint for power cables. Background Technology

[0002] With the rapid development of the national industrial economy, the demand for power supply is increasing, leading to more frequent and widespread medium- and high-voltage power transmission. The cross-regional transmission and widespread application of medium- and high-voltage power place increasingly stringent requirements on the stability of power cable facilities. Since cable lengths are limited during production, splicing between cables is inevitable; therefore, ensuring the reliability and stability of these splices is of paramount importance.

[0003] Currently, there are two main types of straight-through joints for medium-voltage cables: heat-shrinkable and cold-shrinkable. Heat-shrinkable joints require the use of open flames, posing significant safety hazards and high risks, especially in situations where open flames are inconvenient, such as chemical plants and oil refineries, where they can easily lead to serious disasters, causing significant casualties and property damage. Existing cold-shrinkable joints also generally suffer from insufficient sealing, leading to moisture infiltration and circuit failures. Furthermore, the outer shielding and insulation layers are generally produced using a spray coating process, which does not provide ideal optimization of the electric field. Based on these issues, this application proposes a cold-shrinkable joint for power cables that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cold shrink intermediate joint for power cables.

[0005] The purpose of this utility model is achieved through the following technical solution: a cold shrink intermediate joint for power cables, comprising a joint tube, wherein a shielding mesh is installed inside the tube wall, an insulating layer is installed in the middle of the inner wall of the joint tube, a plurality of uniformly arrayed high-temperature resistant sleeves are installed on the inner wall of the insulating layer, shielding contact sleeves are installed on the inner side of both ends of the inner wall of the joint tube, sealing sleeves are installed on the outer side of both ends of the inner wall of the joint tube, and a shielding coating is applied to the outer surface of the joint tube.

[0006] Optionally, both ends of the shielding mesh are connected to two shielding contact sleeves respectively.

[0007] Optionally, the inner diameter of each of the high-temperature resistant sleeves is smaller than the inner diameter of the insulating layer.

[0008] Optionally, the inner walls of both sealing sleeves are equipped with a plurality of uniformly arrayed baffles, all of which are inclined and the inclination direction faces the inside of the connector tube.

[0009] This utility model has the following advantages:

[0010] This cold-shrink joint for power cables uses a joint tube as the main body. The inside of the joint tube is filled with a shielding mesh, and shielding contact sleeves are installed on the inner sides of both ends of the joint tube, connected to the shielding mesh. When two cables are inserted into the joint tube, the shielding contact sleeves contact the cables to form a circuit, thus shielding the electrical signal. An insulating layer is installed in the center of the joint tube, which blocks electrical conduction, preventing the entire cold-shrink joint from becoming conductive. Multiple evenly arrayed high-temperature resistant sleeves are installed on the inner wall of the insulating layer, fitting snugly against the cables. When the two cables are connected and energized, a large amount of heat is generated; the high-temperature resistant sleeves block this heat, preventing heat transfer and potential spontaneous combustion.

[0011] Meanwhile, sealing sleeves are installed on the outer sides of both ends of the connector tube. Multiple baffles are installed on the inner walls of the two sealing sleeves. They are arranged at an angle with the angle facing inward. When in use, the baffles contact the cable and can seal the gap between the cable and the connector tube to prevent water vapor, air and other substances from entering and affecting the conductivity.

[0012] Meanwhile, a shielding coating is applied to the outer surface of the connector tube, which can further improve the shielding effect of the cold shrink connector, and the shielding layer is easy to apply and recoat. Attached Figure Description

[0013] Figure 1 is a cross-sectional schematic diagram of the overall structure of this utility model;

[0014] Figure 2 is a schematic diagram of the internal structure of the sealing sleeve in this utility model.

[0015] In the diagram: 1-Connector tube, 2-Shielding mesh, 3-Insulation layer, 4-High temperature resistant sleeve, 5-Shielding coating, 6-Sealing sleeve, 7-Shielding contact sleeve, 8-Stop bar. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0017] As shown in Figures 1 and 2, a cold shrink intermediate joint for power cables includes a joint tube 1, a shielding mesh 2 installed inside the tube wall of the joint tube 1, an insulating layer 3 installed in the middle of the inner wall of the joint tube 1, a plurality of uniformly arrayed high-temperature resistant sleeves 4 installed on the inner wall of the insulating layer 3, shielding contact sleeves 7 installed on the inner side of both ends of the inner wall of the joint tube 1, sealing sleeves 6 installed on the outer side of both ends of the inner wall of the joint tube 1, and a shielding coating 5 coated on the outer surface of the joint tube 1.

[0018] As an optional technical solution of this utility model, the two ends of the shielding mesh 2 are respectively connected to two shielding contact sleeves 7, which facilitates the formation of a shielding circuit in the pipe wall of the connector pipe 1 for conducting the current generated by the cable.

[0019] As an optional technical solution of this utility model, the inner diameter of the multiple high-temperature resistant sleeves 4 is smaller than the inner diameter of the insulation layer 3, so that the multiple high-temperature resistant sleeves 4 can directly contact the cable to block the heat transfer of the cable.

[0020] As an optional technical solution of this utility model, the inner walls of the two sealing sleeves 6 are each equipped with a plurality of uniformly arrayed baffles 8. The plurality of baffles 8 are inclined and the inclination direction is towards the inside of the connector tube 1. The plurality of baffles 8 contact the cable, so that the sealing sleeve 6 and the cable have good sealing performance and prevent foreign matter from entering.

[0021] In summary, the features, assembly method, usage process, and functions of each component in this utility model are as follows: The connector tube 1 serves as the main body of the cold shrink connector. A shielding mesh 2 is filled inside the connector tube 1, and shielding contact sleeves 7 are provided on the inner sides of both ends of the connector tube 1, connected to the shielding mesh 2. When two cables extend into the connector tube 1, the shielding contact sleeves 7 contact the cables to form a circuit, thus shielding the electrical signal. An insulating layer 3 is installed in the middle of the connector tube 1. The insulating layer 3 can block the electrical conduction of the cables, making the entire cold shrink connector non-conductive. Multiple uniformly arrayed high-strength insulating materials are installed on the inner wall of the insulating layer 3. The heat-resistant sleeve 4 is attached to the cable. When the two cables are connected and energized, a large amount of heat will be generated. The heat-resistant sleeve 4 can block the heat and prevent heat transfer, thus preventing spontaneous combustion. Sealing sleeves 6 are installed on the outer sides of both ends of the connector tube 1. Multiple baffles 8 are installed on the inner walls of the two sealing sleeves 6. They are arranged at an angle with the inward direction. When in use, the baffles 8 contact the cable and can seal the gap between the cable and the connector tube 1 to prevent water vapor, air, etc. from entering and affecting the conductivity. A shielding coating 5 is coated on the outer surface of the connector tube 1, which can further improve the shielding effect of the cold shrink joint. The shielding coating 5 is also easy to apply and recoat.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric power cable cold shrink intermediate joint, characterized by: The device includes a connector tube (1), a shielding mesh (2) installed inside the tube wall of the connector tube (1), an insulating layer (3) installed in the middle of the inner wall of the connector tube (1), a plurality of uniformly arrayed high-temperature resistant sleeves (4) installed on the inner wall of the insulating layer (3), shielding contact sleeves (7) installed on the inner side of both ends of the inner wall of the connector tube (1), sealing sleeves (6) installed on the outer side of both ends of the inner wall of the connector tube (1), and a shielding coating (5) coated on the outer surface of the connector tube (1).

2. The cold shrink joint for power cables according to claim 1, characterized in that: The two ends of the shielding mesh (2) are respectively connected to two shielding contact sleeves (7).

3. The cold shrink joint for power cables according to claim 1, characterized in that: The inner diameter of each of the high-temperature resistant sleeves (4) is smaller than the inner diameter of the insulating layer (3).

4. A cold-shrink intermediate joint for power cables according to claim 1, characterized in that: The inner walls of both sealing sleeves (6) are equipped with a plurality of uniformly arranged baffles (8), and the plurality of baffles (8) are inclined, with the inclination direction facing the interior of the connector tube (1).

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