Intermediate joint of high-voltage cable

Abstract

The utility model relates to the technical field of cables, in particular to a high-voltage cable intermediate joint, which comprises a connecting pipe, a semi-conduction band, an insulating pipe, a shielding layer and an outer sheath which are sequentially arranged from inside to outside, a first mounting plate is arranged at an opening at one end of the connecting pipe, and a first gap is reserved between the first mounting plate and the inner hole wall of the connecting pipe; the first mounting plate is provided with a first contact pin, and the first contact pin is located in the connecting pipe; a second mounting plate is arranged at the opening position of the end, away from the first mounting plate, of the connecting pipe, a second notch is reserved between the second mounting plate and the inner hole wall of the connecting pipe, a second inserting needle is arranged on the second mounting plate, and the second inserting needle is located in the connecting pipe; the first pin faces the second gap, and the second pin faces the first gap. According to the utility model, the problem of poor contact of the high-voltage cable due to the fact that the connecting pipe is not pressed tightly can be solved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to a high-voltage cable intermediate joint. Background Art

[0002] High-voltage cables are a type of power cable, referring to power cables used for transmitting electricity between 1 kV and 1000 kV, and are widely used in power transmission and distribution. The structure of power cables can generally be divided into three main parts, namely conductors, insulation shielding layers, and protective layers.

[0003] The main function of a high-voltage cable intermediate joint is to connect the ends of two high-voltage cables, ensure the smooth transmission of electricity, and at the same time ensure the stability and safety of power transmission. The design and manufacture of high-voltage cable intermediate joints take into account the huge pressure of high-voltage power transmission and the resistance to the influence of the external environment to ensure the stability and safety of power transmission. The high-quality materials and advanced technologies of this type of joint endow it with good insulation performance and voltage resistance, which can effectively prevent flashovers and faults in power lines. There are many types of high-voltage cable intermediate joints, among which the heat-shrinkable cable intermediate joint is more commonly used. This intermediate joint includes a connecting pipe, a semiconductive tape, an insulating pipe, a shielding layer, and an outer sheath. The connecting pipe is usually made of copper pipe and is used to connect the cores at the ends of two high-voltage cables. Usually, a hydraulic crimper is required to compress the connecting pipe. The semiconductive tape is used to wrap around the surface of the connecting pipe, and the main function of the semiconductive tape is to uniform the electric field and achieve a smooth transition. The insulating pipe is sleeved outside the semiconductive tape, and the insulating pipe is used to improve the insulation performance of the high-voltage cable. An insulating pipe is externally sleeved with a shielding layer, and the shielding layer mainly plays roles such as electromagnetic shielding, grounding protection, improving electromagnetic compatibility, preventing external interference, and improving the electric field distribution. A protective sleeve is also provided outside the high-voltage cable, and the protective sleeve is mainly used to provide external protection for the high-voltage cable.

[0004] During the process of manufacturing the above intermediate joint, one of the relatively easy problems is that when crimping the connecting pipe, due to the self-shape structure of the core and the connecting pipe, the connecting pipe is likely to be incompletely compressed, resulting in poor contact between the cores, unstable electrical parameters, and even a risk of causing a fire. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a high-voltage cable intermediate joint to improve the problem that the cores of high-voltage cables are prone to poor contact due to the incompletely compressed connecting pipe.

[0006] The utility model is realized through the following technical solutions:

[0007] A medium joint of a high-voltage cable, comprising a connecting pipe, a semiconductive tape, an insulating pipe, a shielding layer and an outer sheath which are arranged in sequence from inside to outside. At an opening end of the connecting pipe, a first mounting plate is provided. There is a first gap between the first mounting plate and the inner hole wall of the connecting pipe. A first pin is provided on the first mounting plate, and the first pin is located inside the connecting pipe. At an opening end of the connecting pipe away from the first mounting plate, a second mounting plate is provided. There is a second gap between the second mounting plate and the inner hole wall of the connecting pipe. A second pin is provided on the second mounting plate, and the second pin is located inside the connecting pipe. And the first pin faces the second gap, and the second pin faces the first gap.

[0008] Further, at both ends of the outer sheath, a plurality of through fixing holes are circumferentially provided. A fixing cylinder is fixedly arranged in each fixing hole. Internal threads are provided inside the fixing cylinder. A tightening bolt is threadedly connected inside the fixing cylinder. One end of the tightening bolt located inside the outer sheath after passing through the fixing cylinder is used to abut against the outer wall of the high-voltage cable.

[0009] Further, a soft sleeve is sleeved on one end of the tightening bolt located inside the outer sheath.

[0010] Further, a plurality of anti-slip protrusions are provided on the surface of the soft sleeve for abutting against the outer wall of the high-voltage cable. The plurality of anti-slip protrusions are made of rubber material.

[0011] Further, fixing grooves are circumferentially provided at both ends of the outer wall of the outer sheath. A plurality of the tightening bolts are all located inside the corresponding fixing grooves.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] In the utility model, when connecting two high-voltage cables, first, the two high-voltage cables are stripped to expose the cores of the two high-voltage cables. Then, a hole can be poked in the middle of the cores of the two cables to be connected using a steel needle. Then, the first core is inserted into the connecting pipe through the first gap, and the second pin extends into the hole of the first core. Subsequently, the second core is inserted into the connecting pipe through the second gap, and the first pin extends into the hole of the second core. Then, a crimping tool is used to crimp the connecting pipe so that the connecting pipe tightly wraps the two cores. Due to the presence of the first pin and the second pin, the contact area between the two cores and the connecting pipe is increased, which can to a certain extent reduce the problem of poor contact that is likely to occur due to the connecting pipe not being tightly pressed in the high-voltage cable. Description of the Drawings

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the utility model, constitute a part of this application, and do not constitute a limitation to the embodiments of the utility model.

[0015] In the attached drawings:

[0016] Figure 1 is a cross-sectional view of the connecting pipe of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the intermediate joint of the present utility model;

[0018] Figure 3 of the present utility model Figure 2 is an enlarged view of part A.

[0019] Reference signs in the attached drawings and corresponding component names:

[0020] 1. Connecting pipe; 2. Semiconductor tape; 3. Insulating pipe; 4. Shielding layer; 5. Outer sheath; 6. First mounting plate; 7. First notch; 8. First pin; 9. Second mounting plate; 10. Second notch; 11. Second pin; 12. Fixing hole; 13. Fixing cylinder; 14. Tightening bolt; 15. Soft sleeve; 16. Anti-slip protrusion; 17. Fixing groove. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with embodiments and the attached drawings. The illustrative embodiments and descriptions thereof of the present utility model are only used to explain the present utility model and shall not be construed as a limitation to the present utility model. It should be noted that the present utility model has been in the actual R & D and use stage.

[0022] Embodiment 1

[0023] A high-voltage cable intermediate joint, referring to Figure 1 、 Figure 2 , includes a connecting pipe 1, a semiconductor tape 2, an insulating pipe 3, a shielding layer 4 and an outer sheath 5 which are arranged in sequence from inside to outside. At the opening of one end of the connecting pipe 1, there is a first mounting plate 6. There is a first notch 7 between the first mounting plate 6 and the inner hole wall of the connecting pipe 1. A first pin 8 is arranged on the first mounting plate 6, and the first pin 8 is located inside the connecting pipe 1. At the opening of the other end of the connecting pipe 1 away from the first mounting plate 6, there is a second mounting plate 9. There is a second notch 10 between the second mounting plate 9 and the inner hole wall of the connecting pipe 1. A second pin 11 is arranged on the second mounting plate 9, and the second pin 11 is located inside the connecting pipe 1. And the first pin 8 faces the second notch 10, and the second pin 11 faces the first notch 7. Among them, the connecting pipe 1, the first mounting plate 6, the first pin 8, the second mounting plate 9 and the second pin 11 are all made of the same material as the copper pipe, so that the connecting pipe 1, the first mounting plate 6, the first pin 8, the second mounting plate 9 and the second pin 11 are electrically conductive.

[0024] In this solution, when there are two high-voltage cables, first strip the two high-voltage cables to expose the cores of the two high-voltage cables. Then, a steel needle can be used to poke a hole in the middle of the two cores to be connected. Then, the first core is inserted into the inside of the connecting pipe 1 through the first notch 7, and the second pin 11 extends into the hole of the first core. Subsequently, the second core is inserted into the inside of the connecting pipe 1 from the second notch 10, and the first pin 8 extends into the hole of the second core. Then, a crimping tool is used to crimp the connecting pipe 1 so that the connecting pipe 1 tightly wraps the two cores. Due to the presence of the first pin 8 and the second pin 11, the contact area between the two cores and the connecting pipe 1 is increased, which can reduce to a certain extent the problem of poor contact that is likely to occur due to the connecting pipe 1 not being tightly pressed in the high-voltage cable.

[0025] Embodiment 2

[0026] On the basis of Embodiment 1, in this embodiment, referring to Figure 2 , Figure 3 , the outer sheath 5 is made of an insulating rubber sleeve. A plurality of through fixing holes 12 are provided along the circumferential direction at both ends of the outer sheath 5. A fixing cylinder 13 is fixedly arranged in each fixing hole 12. An internal thread is provided inside the fixing cylinder 13. A tightening bolt 14 is threadedly connected inside the fixing cylinder 13. One end of the tightening bolt 14 located inside the outer sheath 5 after passing through the fixing cylinder 13 is used to tightly abut against the outer wall of the high-voltage cable. After successively making the connecting pipe 1, the semiconductive tape 2, the insulating pipe 3, the shielding layer 4, and the outer sheath 5 at the joint part of the cable, a wrench is used to tighten the plurality of tightening bolts 14 at both ends of the outer sheath 5 so that all the tightening bolts 14 tightly abut against the corresponding cable outer wall, which is beneficial to improving the tensile performance of the middle joint part of the two high-voltage cables.

[0027] Embodiment 3

[0028] On the basis of Embodiment 2, in this embodiment, referring to Figure 2 , Figure 3 , a soft sleeve 15 is sleeved on one end of the tightening bolt 14 located inside the outer sheath 5. The soft sleeve 15 can be made of a soft rubber material to prevent damage to the outer rubber layer of the high-voltage cable when the tightening bolt 14 is tightened.

[0029] Embodiment 4

[0030] On the basis of Embodiment 3, in this embodiment, referring to Figure 2 , Figure 3, a plurality of anti-slip protrusions 16 are provided on the surface of the soft sleeve 15 for abutting against the outer wall of the high-voltage cable, and the plurality of anti-slip protrusions 16 are made of rubber material. The plurality of anti-slip protrusions 16 can improve the anti-slip performance between the soft sleeve 15 and the outer wall of the corresponding high-voltage cable. When a pulling force occurs between two high-voltage cables, the outer sheath 5 can tighten the outer walls of the two high-voltage cables, thereby reducing the tension borne by the internal structure of the intermediate joint.

[0031] Embodiment 5

[0032] On the basis of Embodiment 4, in this embodiment, referring to Figure 2 , Figure 3 , fixing grooves 17 are circumferentially formed at both ends of the outer wall of the outer sheath 5, and the plurality of fastening bolts 14 are all located inside the corresponding fixing grooves 17. Placing all the fastening bolts 14 inside the fixing grooves 17 can reduce the friction or other interference caused by surrounding obstacles to the fastening bolts 14 during the movement of the high-voltage cable.

[0033] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A medium joint of a high-voltage cable, comprising a connecting pipe (1), a semiconductive tape (2), an insulating pipe (3), a shielding layer (4) and an outer sheath (5) which are arranged in sequence from inside to outside, and is characterized in that: One end of the connecting pipe (1) is provided with a first mounting plate (6). A first notch (7) is left between the first mounting plate (6) and the inner hole wall of the connecting pipe (1). A first pin (8) is arranged on the first mounting plate (6), and the first pin (8) is located inside the connecting pipe (1). One end of the connecting pipe (1) far from the first mounting plate (6) is provided with a second mounting plate (9). A second notch (10) is left between the second mounting plate (9) and the inner hole wall of the connecting pipe (1). A second pin (11) is arranged on the second mounting plate (9), and the second pin (11) is located inside the connecting pipe (1). And the first pin (8) faces the second notch (10), and the second pin (11) faces the first notch (7).

2. The intermediate joint of a high-voltage cable according to claim 1, characterized in that: A plurality of through fixing holes (12) are circumferentially formed at both ends of the outer sheath (5). A fixing cylinder (13) is fixedly arranged in each fixing hole (12). An internal thread is arranged inside the fixing cylinder (13). A tightening bolt (14) is threadedly connected inside the fixing cylinder (13). One end of the tightening bolt (14) located inside the outer sheath (5) after passing through the fixing cylinder (13) is used to tightly abut against the outer wall of the high-voltage cable.

3. The intermediate joint of a high-voltage cable according to claim 2, characterized in that: A soft sleeve (15) is sleeved on one end of the tightening bolt (14) located inside the outer sheath (5).

4. The intermediate joint of a high-voltage cable according to claim 3, characterized in that: A plurality of anti-slip protrusions (16) are arranged on the surface of the soft sleeve (15) for abutting against the outer wall of the high-voltage cable. The plurality of anti-slip protrusions (16) are made of rubber material.

5. The intermediate joint of a high-voltage cable according to claim 4, characterized in that: Fixing grooves (17) are circumferentially formed at both ends of the outer wall of the outer sheath (5). The plurality of tightening bolts (14) are all located inside the corresponding fixing grooves (17).

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