Distribution cable joint insulation structure

Abstract

The utility model relates to the technical field of cable joints, and provides a distribution cable joint insulation structure, which comprises a cable main body and a copper conductor arranged in the cable main body, an insulation layer is coated outside the copper conductor, a wiring terminal is arranged at one end of the copper conductor, and sealant is filled between the insulation layer and the wiring terminal. The wiring terminal comprises a connecting sleeve arranged outside the copper conductor in a sleeving mode and a connector fixedly installed at one end of the connecting sleeve, and an insulating sleeve is arranged outside the insulating layer and the connecting sleeve in a sleeving mode. According to the utility model, through the arrangement of the fitting assembly, the cavity volume of the connecting sleeve after extrusion is reduced, and the contact area between the connecting sleeve and the copper conductor is increased, so that the resistance at the wiring terminal is reduced, the heat dissipation is reduced, and the aging condition of the insulating sleeve is relieved; therefore, the contact with the copper conductor is more convenient, and the current flowing efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the field of cable joint technology, and in particular to an insulation structure for a power distribution cable joint. Background Technology

[0002] In the process of power transmission, cable joints are important components of cables. During the manufacturing of cable joints, a portion of the insulation layer outside the copper conductor of the cable needs to be stripped before the terminal block is fitted onto it. To ensure the stability of the connection between the terminal block and the copper conductor, hydraulic equipment is often used to compress the terminal block, deforming it and locking it against the copper conductor. While this increases connection stability, the connection end between the terminal block and the copper conductor is a cylinder; under compression, it will converge inwards, creating gaps at both ends that are not in close contact with the copper conductor. When gaps exist between the terminal block and the copper conductor, it is equivalent to creating a "break" or "gap" at the connection point. This causes the current flow path to become discontinuous, increasing the difficulty of current flow and thus increasing resistance. This leads to overheating at the connection point, and over time, it accelerates the aging of the outer insulating sleeve, resulting in reduced insulation performance and even partial discharge. Therefore, we propose an insulation structure for power distribution cable joints. Utility Model Content

[0003] The purpose of this utility model is to solve the problem that the insulating sleeves in existing cable joints are prone to aging during use, and to propose an insulation structure for power distribution cable joints.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An insulation structure for a power distribution cable joint includes a cable body and a copper conductor disposed inside the cable body. The copper conductor is covered with an insulation layer. One end of the copper conductor is provided with a terminal, and the space between the insulation layer and the terminal is filled with sealant. The terminal includes a connecting sleeve sleeved outside the copper conductor and a connector fixedly installed at one end of the connecting sleeve. An insulating sleeve is sleeved outside the insulation layer and the connecting sleeve. The connecting sleeve is provided with a fitting component inside to increase the contact area between the connecting sleeve and the copper conductor.

[0006] The bonding assembly includes bonding cavities formed by extruding connecting sleeves on both sides of the copper conductor. A bonding block that compresses the internal space of the bonding cavity is fixedly installed inside the bonding cavity. One end of the bonding block is in contact with the copper conductor, and the contact end is arc-shaped.

[0007] Preferably, a heat-shrinkable sleeve is provided on the outside of the cable body and the insulation layer, and one end of the heat-shrinkable sleeve is connected to the insulation sleeve.

[0008] Preferably, the overlapping length of the heat-shrinkable sleeve and the insulating sleeve is 20-30 mm.

[0009] Preferably, the insulating sleeve is made of polyvinyl chloride.

[0010] Preferably, a plurality of heat dissipation grooves for accelerating the heat dissipation of the fitting cavity are provided at one end of the inner cavity of the connecting sleeve close to the connector.

[0011] Preferably, the cross-section of the heat dissipation groove is "human" shaped.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Through the setting of the fitting component, the present utility model reduces the cavity volume of the connecting sleeve after being squeezed, increases the contact area between the connecting sleeve and the copper conductor, thereby reducing the resistance at the terminal, reducing the generation of heat, and alleviating the aging of the insulating sleeve. In addition, the arc-shaped setting of the contact end of the fitting block makes it more convenient to contact the copper conductor, further improving the efficiency of current flow.

[0014] 2. Through the setting of the heat dissipation groove, the present utility model accelerates the heat flow rate at the terminal, slows down the aging rate of the insulating sleeve here, and ensures its insulation performance. In addition, the special setting of the cross-section of the heat dissipation groove prevents foreign impurities from entering the connecting sleeve, ensuring the normal flow of current. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is a cross-sectional view of the present utility model in the top view direction;

[0017] Figure 3 is Figure 2 an enlarged structural schematic diagram of area A in

[0018] Figure 4 is a cross-sectional view of the terminal of the present utility model in the side view direction;

[0019] Figure 5 is Figure 4 an enlarged structural schematic diagram of area B in

[0020] Figure 6 is a front view of the terminal of the present utility model.

[0021] In the figure: 1. Cable main body; 2. Copper conductor; 3. Insulation layer; 4. Terminal; 41. Connector; 42. Connecting sleeve; 5. Insulating sleeve; 6. Fitting component; 61. Fitting cavity; 62. Fitting block; 7. Heat dissipation groove; 8. Heat-shrinkable sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] During electrical power transmission, the insulating sleeve 5 outside the cable joint is often affected by factors such as temperature and electric field, gradually leading to insulation aging, reduced insulation performance, and even partial discharge. Incomplete statistical analysis shows that the main cause of cable failures is problems with the cable joint. Furthermore, during the manufacturing process of the cable joint, the terminal 4 is not always perfectly flush with the copper conductor 2, leaving gaps. These air gaps affect current flow, increasing resistance at the terminal 4 and causing higher temperatures, thus accelerating the aging of the insulating sleeve 5. To solve these problems, we propose the following solutions.

[0024] Example 1

[0025] The insulating sleeve 5 in existing cable joints is prone to aging during use, refer to Figures 1-6 This embodiment proposes an insulation structure for a power distribution cable joint, which reduces the resistance at the terminal 4, decreases heat generation, and alleviates the aging of the insulating sleeve 5. It mainly consists of a cable body 1 and a copper conductor 2 disposed inside the cable body 1, with an insulation layer 3 covering the copper conductor 2. A terminal 4 is located at one end of the copper conductor 2, and sealant is filled between the insulation layer 3 and the terminal 4. The terminal 4 includes a connecting sleeve 42 sleeved outside the copper conductor 2 and a connector 41 fixedly installed at one end of the connecting sleeve 42. An insulating sleeve 5 is sleeved outside the insulation layer 3 and the connecting sleeve 42. The connecting sleeve 42 has a bonding assembly inside to increase the contact area between the connecting sleeve 42 and the copper conductor 2. Component 6: When manufacturing the cable connector, the copper conductor 2 needs to be peeled off from the cable body 1 first. Then, a portion of the insulation layer 3 on the copper conductor 2 is peeled off using a tool. Next, the connecting sleeve 42 is fitted onto it. Finally, the connecting sleeve 42 is squeezed with a tool to make it fit tightly against the copper conductor 2, reducing the probability of the terminal 4 falling off the copper conductor 2. At the same time, sealant is filled between the connecting sleeve 42 and the insulation layer 3 to prevent external impurities from contacting the copper conductor 2, providing a certain sealing and insulation effect. Then, the bonding component 6 makes the connecting sleeve 42 fit tightly against the copper conductor 2, reducing the resistance at the terminal 4, reducing heat dissipation, and alleviating the aging of the insulation sleeve 5.

[0026] During the manufacturing process of cable joints, to ensure the stability of the connection between the terminal 4 and the copper conductor 2, hydraulic equipment is often used to squeeze the terminal 4, deforming it and locking it against the outside of the copper conductor 2. While this increases connection stability, it also increases the gap between the terminal 4 and the copper conductor 2, making it more difficult for current to flow, increasing the resistance at the terminal 4, and causing a large amount of heat to be generated there, accelerating the aging of the insulating sleeve 5 and damaging its insulation performance. Therefore, this embodiment increases the contact area between the connecting sleeve 42 and the copper conductor 2 by setting the fitting component 6, reducing the resistance at this point and alleviating the aging of the insulating sleeve 5. The specific implementation method is as follows:

[0027] The bonding assembly 6 includes bonding cavities 61 formed by extruding the connecting sleeve 42 on both sides of the copper conductor 2. A bonding block 62, which compresses the internal space of the bonding cavity 61, is fixedly installed inside the bonding cavity 61. One end of the bonding block 62 contacts the copper conductor 2, and the contact end has an arc shape. When the connecting sleeve 42 is extruded onto the copper conductor 2, the connecting sleeve 42, being made of metal, is not easily compressed inwards after being compressed; instead, it extends outwards, flattening its edges and preventing contact with the copper conductor 2. In this embodiment, the bonding block 62 is provided in the bonding cavity 61, causing it to move towards the center and contact the copper conductor 2 after being compressed. This increases the contact area between the terminal 4 and the copper conductor 2, improves the effective current flow area, reduces the resistance of the terminal 4, slows heat generation, and improves the service life of the insulating sleeve 5. Furthermore, the arc shape of the contact end of the bonding block 62 makes it easier to contact the copper conductor 2, further improving the efficiency of current flow.

[0028] A heat-shrinkable sleeve 8 is fitted over the cable body 1 and the insulation layer 3, and one end of the heat-shrinkable sleeve 8 is connected to the insulation sleeve 5. The heat-shrinkable sleeve 8 restricts the movement of each copper conductor 2, reduces problems caused by loose wiring, and ensures the stability and reliability of the cable connection.

[0029] The overlap length between the heat shrinkable sleeve 8 and the insulating sleeve 5 is 20mm. The overlap between the heat shrinkable sleeve 8 and the insulating sleeve 5 forms good electrical isolation. The 20mm overlap length not only facilitates operation by staff, but also achieves the required isolation effect, while saving materials.

[0030] The insulating sleeve 5 is made of polyvinyl chloride (PVC). PVC has good electrical insulation properties and chemical corrosion resistance. The insulating sleeve 5 made of PVC can achieve a good electrical isolation effect.

[0031] Example 2

[0032] On the basis of the first embodiment, the technical solution proposed in the first embodiment is used to solve the shortcoming that the insulating sleeve 5 in the existing cable joint is prone to aging during use. However, although the setting of the fitting component 6 can maximize the contact area between the copper conductor 2 and the connecting sleeve 42, the copper conductor 2 and the connecting sleeve 42 cannot be completely fitted, so there will be a part of the assembly gap. These gaps will cause the resistance at the terminal 4 to be higher than other positions, and the generated heat will also be higher than other positions.

[0033] Referring to Figures 1-6 , a plurality of heat dissipation grooves 7 for accelerating the heat dissipation of the fitting cavity 61 are provided at one end of the inner cavity of the connecting sleeve 42 close to the connector 41. In order to reduce the heat at the terminal 4 and slow down the aging rate of the insulating sleeve 5 here, in this embodiment, the heat dissipation grooves 7 provided in the inner cavity of the connecting sleeve 42 can accelerate the heat dissipation rate here and ensure the insulation performance of the insulating sleeve 5.

[0034] The cross-section of the heat dissipation groove 7 is "human" shaped. As Figure 5 shown, the cross-section of the heat dissipation groove 7 is a "human" shape rotated 90 degrees. This special setting increases the difficulty of external dust entering the inside of the connecting sleeve 42. Even if dust enters the heat dissipation groove 7 from the upper part, it will fall into the lower outlet of the heat dissipation groove 7 under the action of gravity and wait to be blown out by the heat flow. Because dust has the property of absorbing moisture and a large amount of it accumulates on the copper conductor 2, it will affect the flow of current. The special setting of the heat dissipation groove 7 in this embodiment ensures the normal flow of current.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An insulation structure for a power distribution cable joint, comprising a cable body (1) and a copper conductor (2) disposed inside the cable body (1), wherein the copper conductor (2) is covered with an insulation layer (3), one end of the copper conductor (2) is provided with a terminal (4), and a sealant is filled between the insulation layer (3) and the terminal (4), characterized in that: The terminal (4) includes a connection sleeve (42) sleeved outside the copper conductor (2) and a connection head (41) fixedly installed at one end of the connection sleeve (42). An insulating sleeve (5) is sleeved outside the insulating layer (3) and the connection sleeve (42). A fitting component (6) for increasing the fitting area between the connection sleeve (42) and the copper conductor (2) is provided inside the connection sleeve (42). The fitting component (6) includes fitting cavities (61) formed on both sides of the copper conductor (2) by extruding the connection sleeve (42). A fitting block (62) for compressing the internal space of the fitting cavity (61) is fixedly installed inside the fitting cavity (61). One end of the fitting block (62) contacts the copper conductor (2), and the contact end is arc-shaped.

2. The insulation structure of a power distribution cable joint according to claim 1, characterized in that: A heat shrinkable support sleeve (8) is sleeved outside the cable body (1) and the insulating layer (3), and one end of the heat shrinkable support sleeve (8) is lapped with the insulating sleeve (5).

3. The insulation structure of a power distribution cable joint according to claim 2, characterized in that: The lapping length of the heat shrinkable support sleeve (8) and the insulating sleeve (5) is 20 - 30 mm.

4. The insulation structure of a power distribution cable joint according to claim 1, characterized in that: The insulating sleeve (5) is made of polyvinyl chloride.

5. The insulation structure of a power distribution cable joint according to claim 1, characterized in that: A plurality of heat dissipation grooves (7) for accelerating the heat dissipation of the fitting cavity (61) are formed at one end of the inner cavity of the connection sleeve (42) near the connection head (41).

6. The insulation structure of a power distribution cable joint according to claim 5, characterized in that: The cross-section of the heat dissipation groove (7) is "human" shaped.

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