Waterproof cold-contraction intermediate joint for 10kv cable

Abstract

The utility model relates to the technical field of joint devices, in particular to a waterproof cold-shrink intermediate joint for a 10kv cable. According to the technical scheme, the cable comprises cable bodies and further comprises a middle connector connected between the cable bodies in a sleeved mode, an insulating layer is arranged outside the middle connector, an outer shielding layer is fixedly connected to the outer surface of the insulating layer, each cable body comprises a cable core, the cable core is sleeved with a stress pipe, and a conductive pipe is arranged on the outer surface of the stress pipe. According to the utility model, the electric field concentration at the cut-off position of the outer shielding layer of the cable is dispersed, the electric field intensity can be reduced, the situation of local temperature rise is reduced, the insulating property and reliability of the cable are improved, and the stress tube has high elasticity and high dielectric constant, so that the cable can be better attached to the cable; the sealing performance and the waterproof performance of the intermediate joint are improved, and the sealing performance and the waterproof performance of the intermediate joint can be further improved through the sealing assembly.

Description

Technical Field

[0001] This utility model relates to the field of joint device technology, and in particular to a 10kV cable waterproof cold shrink intermediate joint. Background Technology

[0002] With the continuous development of urban power grids, the application of 10kV cables is becoming increasingly widespread. During cable laying, the intermediate joint is a crucial step, directly affecting the cable's operational safety and reliability. Existing cables are all covered with an outer shielding layer. When using traditional cold-shrink intermediate joints, this outer shielding layer is cut off, causing electric field lines to bend and concentrate at the cut point. This concentration of electric field leads to localized temperature increases, potentially accelerating the aging and damage of the insulation material and reducing the reliability of the intermediate joint. Therefore, we propose a waterproof cold-shrink intermediate joint for 10kV cables. Summary of the Invention

[0003] The purpose of this invention is to address the problem in the prior art where electric field concentration occurs at the cut point of the outer shielding layer, leading to local temperature rise, which may accelerate the aging and damage of the insulation material and reduce the reliability of the intermediate joint. This invention proposes a waterproof cold-shrink intermediate joint for 10kV cables.

[0004] The technical solution of this utility model is: a waterproof cold-shrink joint for 10kV cables, comprising a cable body, and further comprising:

[0005] An intermediate joint is sleeved between the cable bodies, and an insulating layer is provided on the outside of the intermediate joint. An outer shielding layer is fixedly connected to the outer surface of the insulating layer.

[0006] The cable body includes a cable core, a stress tube is sleeved on the cable core, the stress tube is sleeved with the intermediate joint, and a conductive tube is provided on the outer surface of the stress tube;

[0007] A connecting pipe is crimped to the outside of the intermediate joint, and sealing components are provided between the connecting pipe and the cable body on both sides.

[0008] Optionally, the cable body has an outer cable insulation layer, and an outer cable shielding layer is provided outside the cable insulation layer. The insulation layer has a thickness of 7-8mm, and the outer shielding layer is integrally injection molded.

[0009] Optionally, the sealing assembly includes a waterproof sleeve fitted between the two ends of the connecting pipe and the cable body.

[0010] Optionally, each end of the waterproof sleeve away from the intermediate joint is provided with an installation groove, and a rubber sealing ring is fixedly connected in the installation groove.

[0011] Optionally, a metal clamp is fitted between the connecting pipe and the cable body, and the gap between the metal clamp and the cable body is filled with sealant.

[0012] Optionally, waterproof tape is wrapped between the waterproof sleeve and the cable body.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] 1. This utility model disperses the electric field concentration at the cut point of the cable's outer shield layer by using a stress tube, which can effectively reduce the electric field strength and reduce local temperature rise, thereby improving the insulation performance and reliability of the cable. Furthermore, since the stress tube has high elasticity and high dielectric constant, it can better fit with the cable, improving the sealing and waterproof performance of the intermediate joint.

[0015] 2. This utility model can further improve the sealing and waterproof performance of intermediate joints by using a sealing component located between the connecting pipe and the cable.

[0016] This invention achieves electric field concentration at the cut point of the outer shielding layer of the cable, which can reduce the electric field strength and reduce local temperature rise, thereby improving the insulation performance and reliability of the cable. Furthermore, due to the high elasticity and high dielectric constant of the stress tube, it can better fit with the cable, improving the sealing and waterproof performance of the intermediate joint. Through the sealing component, the sealing and waterproof performance of the intermediate joint can be further improved. Attached Figure Description

[0017] Figure 1 A schematic diagram of the internal structure of this utility model is provided;

[0018] Figure 2 A schematic diagram of the overall structure of this utility model is provided;

[0019] Figure 3 A schematic diagram of the internal structure of Embodiment 2 of this utility model is provided.

[0020] Reference numerals in the attached diagram: 1. Cable body; 2. Intermediate joint; 3. Insulation layer; 4. Outer shielding layer; 5. Cable core; 6. Stress tube; 7. Conductive tube; 8. Connecting tube; 9. Waterproof sleeve; 10. Mounting groove; 11. Rubber sealing ring; 12. Metal clamp; 13. Waterproof tape; 14. Cable insulation layer; 15. Cable outer shielding layer. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1

[0028] like Figures 1 to 2As shown, the present invention proposes a 10kV cable waterproof cold shrink intermediate joint, including a cable body 1, a cable insulation layer 14 on the outside of the cable body 1, an outer shielding layer 15 on the outside of the cable insulation layer 14, and an intermediate joint 2 sleeved between the cable bodies 1. The intermediate joint 2 is provided with an insulation layer 3 on the outside, and an outer shielding layer 4 is fixedly connected to the outer surface of the insulation layer 3. The insulation layer 3 is preferably 7.5mm thick and can withstand 54kV / 5min power frequency voltage, with better insulation performance and voltage resistance. The outer shielding layer 4 is integrally molded by injection molding. The outer shielding layer 4 is integrally molded by injection molding process, with uniform resistance, which improves the shielding performance and conductivity of the intermediate joint.

[0029] The cable body 1 includes a cable core 5, a stress tube 6 is sleeved on the cable core 5, the stress tube 6 is sleeved with the intermediate joint 2, and a conductive tube 7 is provided on the outer surface of the stress tube 6. The stress tube 6 can disperse the electric field concentration at the cut point of the cable outer shielding layer 15 while being tightly attached to the cable core 5, effectively reducing the electric field strength and reducing the local temperature rise, thereby improving the insulation performance and reliability of the cable.

[0030] In addition, the connecting tube 8 crimped to the outside of the intermediate joint 2 is used to shrink the intermediate joint 2 and improve the tightness of the connection between the intermediate joint 2 and the cable body 1.

[0031] Example 2

[0032] like Figure 3 As shown, based on embodiment 1, a sealing assembly is provided between the two sides of the connecting pipe 8 and the cable body 1. The sealing assembly includes a waterproof sleeve 9 that is sleeved between the two ends of the connecting pipe 8 and the cable body 1. An installation groove 10 is provided at the end of the waterproof sleeve 9 away from the intermediate joint 2. A rubber sealing ring 11 is fixedly connected in the installation groove 10. The waterproof sleeve 9 and the rubber sealing ring 11 are used to improve the waterproof protection effect of the connecting pipe 8.

[0033] A metal clamp 12 is fitted between the connecting pipe 8 and the cable body 1. The metal clamp 12 is used to increase the strength and sealing of the connection and improve the mechanical strength of the device. The gap between the metal clamp 12 and the cable body 1 is filled with sealant to prevent moisture penetration. A waterproof tape 13 is wrapped between the waterproof sleeve 9 and the cable body 1. The waterproof tape 13 is used to further increase the sealing performance and prevent moisture penetration. Thus, the sealing performance and waterproof performance of the intermediate joint 2 can be further improved through the sealing components.

[0034] Working principle: In the working process of this utility model, the cable body 1 is first stripped according to the installation process, and the stress tube 6 is sleeved on the cable core 5. Due to the high elasticity and high dielectric constant of the stress tube 6, it can disperse the electric field concentration at the cut point of the outer shielding layer 15 of the cable while tightly fitting with the cable core 5, effectively reducing the electric field strength and reducing the local temperature rise, thereby improving the insulation performance and reliability of the cable. Then, the intermediate joint 2 is sleeved on, and the connecting tube 8 is pressed on the outside of the intermediate joint 2 to shrink the intermediate joint 2, thereby improving the tightness of the connection between the intermediate joint 2 and the cable body 1. The thickness of the insulation layer 3 is preferably 7.5mm, which can withstand 54kV / 5min power frequency voltage and has better insulation performance and voltage withstand performance. The outer shielding layer 4 is integrally formed by injection molding process, with uniform resistance, improving the shielding performance and conductivity of the intermediate joint. This device meets the requirements of GB / T12706.4.

[0035] In the sealing components on both sides of the connecting pipe 8, the waterproof sleeve 9 and the rubber sealing ring 11 are used to improve the waterproof protection effect of the connecting pipe 8. At the same time, the metal clamp 12 sleeved between the connecting pipe 8 and the cable body 1 is used to increase the strength and sealing of the connection and improve the mechanical strength of the device. The sealant filled in the gap between the metal clamp 12 and the cable body 1 is used to prevent water penetration. Finally, the waterproof tape 13 wrapped between the waterproof sleeve 9 and the cable body 1 further increases the sealing performance and prevents water penetration. Thus, the sealing components can further improve the sealing and waterproof performance of the intermediate joint 2.

[0036] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A waterproof cold-shrink joint for 10kV cables, comprising a cable body (1), characterized in that, Also includes: An intermediate joint (2) is sleeved between the cable bodies (1), and an insulation layer (3) is provided on the outside of the intermediate joint (2). An outer shielding layer (4) is fixedly connected to the outer surface of the insulation layer (3). The cable body (1) includes a cable core (5), the cable core (5) is covered with a stress tube (6), the stress tube (6) is sleeved with the intermediate joint (2), and the outer surface of the stress tube (6) is provided with a conductive tube (7). A connecting pipe (8) is crimped to the outside of the intermediate joint (2), and a sealing assembly is provided between the two sides of the connecting pipe (8) and the cable body (1).

2. The 10kV cable waterproof cold-shrink joint according to claim 1, characterized in that, The cable body (1) has a cable insulation layer (14) on the outside, and an outer shielding layer (15) is provided outside the cable insulation layer (14). The insulation layer (3) is 7-8 mm thick, and the outer shielding layer (4) is integrally molded by injection molding.

3. A 10kV cable waterproof cold-shrink joint according to claim 1, characterized in that, The sealing assembly includes a waterproof sleeve (9) fitted between the two ends of the connecting pipe (8) and the cable body (1).

4. A 10kV cable waterproof cold-shrink joint according to claim 3, characterized in that, The waterproof sleeve (9) is provided with an installation groove (10) at the end away from the intermediate joint (2), and a rubber sealing ring (11) is fixedly connected in the installation groove (10).

5. A 10kV cable waterproof cold-shrink joint according to claim 4, characterized in that, A metal clamp (12) is fitted between the connecting pipe (8) and the cable body (1), and the gap between the metal clamp (12) and the cable body (1) is filled with sealant.

6. A 10kV cable waterproof cold-shrink joint according to claim 5, characterized in that, Waterproof tape (13) is wrapped between the waterproof sleeve (9) and the cable body (1).

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