High-voltage cable shielding layer fixing device and high-voltage cable

Abstract

The utility model discloses a high-voltage cable shielding layer fixing device and a high-voltage cable. The high-voltage cable shielding layer fixing device comprises a cover body, a fixing seat and a conductive pressing ring, the cover body is provided with a first channel and is provided with a stopping side and a mounting side which are located on the two sides of the first channel, and the stopping side is used for pressing against the end part of an insulating sheath of a cable; the fixing seat is located on the mounting side and detachably connected to the cover body, and the fixing seat and the cover body define a containing cavity together and are provided with a second channel communicated with the containing cavity; the conductive pressing ring is arranged in the containing cavity, one end of the conductive pressing ring in the axial direction abuts against the installation side, and the other end of the conductive pressing ring and the fixing base are arranged in a spaced mode to form a clamping gap which is used for clamping a shielding layer of the cable. In the scheme, the conductive pressing ring and the shielding layer can be stably connected and are not easy to separate; and current-carrying concentration of the conductor is greatly avoided, the service life of the device is prolonged, the structure is simple, the cost is saved, and the operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of cable equipment technology, specifically to a high-voltage cable shielding layer fixing device and a high-voltage cable. Background Technology

[0002] High-voltage cables are a type of power cable, referring to power cables used to transmit power between 1kV and 1000kV, and are widely used in power transmission and distribution.

[0003] Publication number CN205692621U discloses a multi-layer shielded flexible high-voltage cable for new energy vehicles, which includes a conductor, a silicone rubber insulation layer, and a silicone rubber sheath layer. The conductor is extruded with a silicone rubber insulation layer, and a shielding layer is provided between the silicone rubber insulation layer and the silicone rubber sheath layer. The shielding layer includes an aluminum-plastic composite shielding strip and a metal shielding strip. At least one layer of aluminum-plastic composite shielding strip is provided on each side of the metal shielding strip. It has strong shielding and anti-interference function, good flexibility, enhances the cable's anti-electromagnetic interference performance, and reduces economic costs.

[0004] However, when connecting such high-voltage cables, the main method is to manually disassemble the cable shielding conductive layer and then crimp or weld the wire lugs to achieve the connection. This method can easily lead to over-crimping or loose crimping at the cable crimping end, causing the conductor connector to be prone to breakage under stress at the crimping and welding ends. In addition, in order to ensure the cable connection, tin soldering is required, which can easily burn the insulation layer, causing damage to the insulation layer and a decrease in insulation strength, posing a risk of insulation failure during use. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a high-voltage cable shielding layer fixing device to solve the technical problem that in the existing technology, when connecting high-voltage cables, the main method is to manually disassemble the cable shielding conductive layer and then crimp or weld the wire lugs to achieve the connection. This method is prone to over-crimping or loose crimping, which leads to the crimping and welding ends being easily broken under stress.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a high-voltage cable shielding layer fixing device, comprising:

[0008] The cover has a first channel and has a stop side and a mounting side located on both sides of the first channel, the stop side being used to press against the end of the insulating sheath of the cable;

[0009] A fixing base, located on the mounting side and detachably connected to the cover, together enclosing a receiving cavity, and having a second channel communicating with the receiving cavity; and

[0010] A voltage-conducting abutment ring is disposed in the accommodating cavity, with one end of its axial direction abutting against the mounting side and the other end spaced apart from the fixing seat to form a clamping gap, which is used to clamp the shielding layer of the cable.

[0011] In some embodiments, the end of the conductive voltage abutment ring away from the mounting side is provided with an arc-shaped convex surface to form a pressure abutment end face;

[0012] The fixing seat has an arc-shaped concave surface on the side near the pressing end face.

[0013] In some embodiments, the conductive voltage-shielding ring includes two conductive fastening half-rings, which are detachably connected and, when connected, are arranged around the outer periphery of the shielding layer.

[0014] In some embodiments, each of the conductive fastening half-rings is provided with a fastening screw hole and a fastening through hole at both ends. The conductive voltage abutment ring also includes two sets of fastening bolts, each of the fastening bolts passing through the corresponding fastening through hole and screwed into the corresponding fastening screw hole.

[0015] In some embodiments, one of the cover and the fixing base is provided with a connecting screw hole, and the other is provided with a connecting through hole;

[0016] The high-voltage cable shielding layer fixing device also includes a connecting bolt, which passes through the connecting through hole and is screwed into the connecting screw hole.

[0017] In some embodiments, a connecting cylinder protrudes from one end of the fixing seat away from the cover body, and the connecting cylinder is provided with external threads, wherein the second channel extends through the connecting cylinder from the fixing seat;

[0018] The high-voltage cable shielding layer fixing device also includes a copper busbar fastening seat, which has a third channel. The inner wall of the third channel has an internal thread and is screwed onto the connecting cylinder.

[0019] In some embodiments, the third channel includes a first threaded section and a first wiring section connected together in a direction away from the connecting cylinder, wherein the inner diameter of the first threaded section is larger than the inner diameter of the first wiring section.

[0020] In some embodiments, the copper busbar fastening seat has an assembly cylinder protruding from one end away from the connecting cylinder, the assembly cylinder has external threads, and the third channel extends from the copper busbar fastening seat through the assembly cylinder;

[0021] The high-voltage cable shielding layer fixing device also includes an assembly fastening seat, which has a fourth channel. The inner wall of the fourth channel has an internal thread and is screwed onto the assembly cylinder.

[0022] In some embodiments, the fourth channel includes a second threaded segment and a second wiring segment connected together in a direction away from the assembly cylinder, the second wiring segment being progressively wider in a direction away from the second threaded segment; and / or

[0023] The cover, the fixing seat, the copper busbar fastening seat, and the assembly fastening seat are all electrically conductive.

[0024] Secondly, this utility model also provides a high-voltage cable, which includes the high-voltage cable shielding layer fixing device as described in any of the above claims.

[0025] Compared with existing technologies, the high-voltage cable shielding fixing device provided by this utility model, when in use, first removes the insulating sheath at the connection end of the high-voltage cable, then fits the cover of the fixing device onto the outer periphery of the cable's shielding layer, simultaneously pressing the blocking side of the cover against the end of the insulating sheath of the cable's main body section to secure the cover to the end of the cable's insulating sheath, preventing the end cover from moving towards the cable's main body. Next, the conductive voltage abutment ring is pressed tightly against the mounting side of the cover, and then the portion of the cable shielding layer located away from the cover from the conductive voltage abutment ring is bent radially outwards. Finally, the fixing seat is fitted onto the cable and connected to the cover. At this point, the shielding layer at the cable connection end is clamped within the clamping gap between the conductive voltage abutment ring and the fixing seat, ensuring a stable connection between the conductive voltage abutment ring and the shielding layer, preventing it from easily detaching. Furthermore, because the inner wall of the conductive voltage abutment ring and the side near the fixing seat are in contact with the shielding layer, the contact area is larger, resulting in a larger conductive current-carrying surface when transmitting external leakage current through the conductive voltage abutment ring. This greatly avoids conductor current concentration, extends the device's service life, and offers a simple structure, cost savings, and convenient operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the high-voltage cable shielding layer fixing device provided in this embodiment of the present invention being installed on a high-voltage cable;

[0027] Figure 2 yes Figure 1 Cross-sectional view of the medium and high voltage cable shielding layer fixing device and the high voltage cable;

[0028] Figure 3 yes Figure 2 Cross-sectional view of the medium and high voltage cable shielding layer fixing device;

[0029] Figure 4 yes Figure 3 Cross-sectional view of the middle cover and fixing base;

[0030] Figure 5 yes Figure 3 A schematic diagram of the conductive fastening half-ring;

[0031] Figure 6 yes Figure 1Schematic diagram of the central fixed base;

[0032] Figure 7 yes Figure 1 Schematic diagram of the copper busbar fastener;

[0033] Figure 8 yes Figure 1 A schematic diagram of the fastening seat in the middle assembly.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Cover; 1a. First channel; 11. Stopping side; 12. Mounting side; 2. Fixing base; 2a. Receiving cavity; 2b. Second channel; 21. Connecting cylinder; 3. Conductive voltage abutment ring; 3a. Clamping gap; 31. Pressing end face; 32. Conductive fastening half ring; 32a. Fastening screw hole; 32b. Fastening through hole; 4. Copper busbar fastening base; 4a. Third channel; 4b. First threaded section; 4c. First wiring section; 41. Assembly cylinder; 5. Assembly fastening base; 5a. Fourth channel; 5b. Second threaded section; 5c. Second wiring section; 6. High voltage cable; 61. Main body; 62. Main insulation layer; 63. Shielding layer; 64. Insulating sheath. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] To address the technical problem in existing high-voltage cable connections where the cable shielding conductive layer is manually disassembled before crimping or welding the lugs, leading to over-crimping or loose crimping and subsequent breakage at the crimped or welded ends, this invention provides a high-voltage cable shielding layer fixing device. This device ensures a stable connection between the conductive lug and the shielding layer, preventing detachment and significantly reducing current concentration in the conductor. It also extends the device's lifespan, is simple in structure, cost-effective, and easy to operate.

[0038] It should be noted that the high-voltage cable shielding layer fixing device described in this utility model is used for, but not limited to, high-voltage cables. For ease of explanation, this utility model only uses the application of the high-voltage cable shielding layer fixing device to high-voltage cables as an example. The principle of the high-voltage cable shielding layer fixing device applied to other types of equipment is essentially the same as that applied to high-voltage cables, and will not be elaborated here.

[0039] Please see Figures 1 to 4 , Figures 1 to 4This is a schematic diagram of the structure of a high-voltage cable shielding layer fixing device in one embodiment of the present invention. The high-voltage cable shielding layer fixing device includes a cover 1, a fixing seat 2, and a voltage-conducting abutment ring 3. The cover 1 has a first channel 1a and has a stop side 11 and a mounting side 12 located on both sides of the first channel 1a. The stop side 11 is used to press against the end of the insulating sheath 64 of the cable. The fixing seat 2 is located on the mounting side 12 and is detachably connected to the cover 1. Together, they surround a receiving cavity 2a and have a second channel 2b communicating with the receiving cavity 2a. The voltage-conducting abutment ring 3 is located in the receiving cavity 2a, and one end of its axial direction abuts against the mounting side 12, while the other end is spaced apart from the fixing seat 2 to form a clamping gap 3a. The clamping gap 3a is used to clamp the shielding layer 63 of the cable.

[0040] In use, the high-voltage cable shielding layer fixing device provided by this utility model first removes the insulating sheath 64 at the connection end of the high-voltage cable 6. Then, the cover 1 of the fixing device is inserted into the outer periphery of the cable shielding layer 63, while the blocking side 11 of the cover 1 presses against the end of the insulating sheath 64 of the cable body section to secure the cover 1 to the end of the cable insulating sheath 64, preventing the end cover from moving towards the cable body. Next, the conductive voltage abutment ring 3 is pressed tightly against the mounting side 12 of the cover 1. Then, the portion of the cable shielding layer 63 located away from the cover 1 from the conductive voltage abutment ring 3 is bent radially outward. Finally, the fixing seat 2 is inserted onto the cable and connected to the cover 1. At this time, the shielding layer 63 at the cable connection end is clamped in the clamping gap 3a between the voltage-conducting ring 3 and the fixing seat 2. The voltage-conducting ring 3 and the shielding layer 63 can be stably connected and are not easy to separate. Since the inner wall of the voltage-conducting ring 3 and the side near the fixing seat 2 are in contact with the shielding layer 63, the contact area is larger. Therefore, when the external leakage current is transmitted through the voltage-conducting ring 3, the conductive current-carrying surface is larger, which greatly avoids the concentration of conductor current, extends the service life of the device, and has a simple structure, saves costs, and is easy to operate.

[0041] In one embodiment, please refer to Figures 3 to 6 The end of the conductive voltage abutment ring 3 away from the mounting side 12 is provided with an arc-shaped convex surface to form a pressure abutment end face 31; the side of the fixing seat 2 near the pressure abutment end face 31 is provided with an arc-shaped concave surface.

[0042] In this embodiment, the end face of the conductive voltage abutment ring 3 that contacts the cable shielding layer 63 is provided with an arc-shaped convex surface, so that the shielding layer 63 can slowly deform outward in the radial direction, avoiding the shielding layer 63 from breaking due to excessive bending during long-term use, and extending the service life of the cable.

[0043] In one embodiment, please refer to Figure 5 The conductive voltage-resistant ring 3 includes two conductive fastening half-rings 32, which are detachably connected and used to surround the outer periphery of the shielding layer 63 when connected.

[0044] In this embodiment, the conductive voltage abutment ring 3 is set in the form of two conductive fastening half-rings 32 to facilitate flexible replacement and save costs.

[0045] In one embodiment, each conductive fastening half-ring 32 is provided with a fastening screw hole 32a and a fastening through hole 32b at both ends. The conductive voltage abutment ring 3 also includes two sets of fastening bolts, each fastening bolt passing through the corresponding fastening through hole 32b and screwed into the corresponding fastening screw hole 32a.

[0046] In this embodiment, when assembling the two conductive fastening half-rings 32, the fastening bolts are inserted through the fastening through hole 32b of one conductive fastening half-ring 32 and screwed into the fastening screw hole 32a of the other conductive fastening half-ring 32, thereby realizing the detachable connection of the two conductive fastening half-rings 32, which is simple and reliable.

[0047] In one embodiment, one of the cover 1 and the fixing base 2 is provided with a connecting screw hole, and the other is provided with a connecting through hole; the high-voltage cable shielding layer fixing device also includes a connecting bolt, which passes through the connecting through hole and is screwed into the connecting screw hole.

[0048] Similarly, in this embodiment, the cover 1 and the fixing base 2 are detachably connected by the cooperation of connecting bolts, connecting screw holes, and connecting through holes. It should be noted that in one embodiment, there are multiple connecting screw holes and connecting through holes, which are spaced apart circumferentially along their respective carriers.

[0049] In one embodiment, please refer to Figure 3 and Figure 7 The fixed seat 2 has a connecting cylinder 21 protruding from one end away from the cover 1. The connecting cylinder 21 has an external thread. The second channel 2b passes through the connecting cylinder 21 from the fixed seat 2. The high-voltage cable shielding layer fixing device also includes a copper busbar fastening seat 4. The copper busbar fastening seat 4 has a third channel 4a. The inner wall of the third channel 4a has an internal thread and is screwed onto the connecting cylinder 21.

[0050] In this embodiment, after the fixing seat 2 is installed, the copper busbar fastening seat 4 is then fitted onto the cable and screwed onto the connecting cylinder 21, so that the copper busbar fastening seat 4 can be fixed to the copper plate during subsequent cable installation. It should be noted that, in one embodiment, the copper busbar fastening seat 4 adopts a large-pitch hexagonal fixing method, which can use greater torque to fix and improve vibration resistance.

[0051] In one embodiment, the third channel 4a includes a first threaded section 4b and a first wiring section 4c connected in a direction away from the connecting cylinder 21, wherein the inner diameter of the first threaded section 4b is larger than the inner diameter of the first wiring section 4c.

[0052] In this embodiment, the third channel 4a is configured as the first threaded section 4b and the first wiring section 4c, so as to achieve a stable connection between the copper busbar fastener 4 and the connecting cylinder 21, while also ensuring a tight fit between the copper busbar fastener 4 and the cable.

[0053] In one embodiment, please refer to Figure 3 and Figure 8 The copper busbar fastening seat 4 has an assembly cylinder 41 protruding from one end away from the connecting cylinder 21. The assembly cylinder 41 has an external thread, and the third channel 4a passes through the assembly cylinder 41 from the copper busbar fastening seat 4. The high-voltage cable shielding layer fixing device also includes an assembly fastening seat 5, which has a fourth channel 5a. The inner wall of the fourth channel 5a has an internal thread and is screwed onto the assembly cylinder 41.

[0054] In this embodiment, after the copper busbar fastening seat 4 is installed, the mounting fastening seat 5 is then fitted onto the cable and threadedly connected to the mounting sleeve 41, so that the mounting fastening seat 5 can be fixed to the fixing plate during subsequent cable installation. Similarly, in this solution, the mounting fastening seat 5 also adopts a large-pitch hexagonal fixing, which can use greater torque to fix and improve vibration resistance. In this way, the cable can be supported and fixed, avoiding the situation where heavy cables are placed directly on the surface of objects without support and fixation, and the insulation layer is worn down and damaged by long-term use, resulting in the loss of insulation function.

[0055] In one embodiment, the fourth channel 5a includes a second threaded section 5b and a second wiring section 5c connected in a direction away from the assembly cylinder 41, and the second wiring section 5c is gradually widened in a direction away from the second threaded section 5b.

[0056] In this embodiment, the second threaded segment 5b is threadedly connected to the assembly cylinder 41 to ensure a stable connection between the assembly fastener 5 and the assembly cylinder 41. Simultaneously, the second cable routing segment 5c is gradually extended away from the second threaded segment 5b to allow the portion of the cable extending from the second cable routing segment 5c to bend arbitrarily in the radial direction, ensuring the flexibility of the portion of the cable extending from the second cable routing segment 5c.

[0057] In one embodiment, the cover 1, the fixing seat 2, the copper busbar fastening seat 4, and the assembly fastening seat 5 are all conductive.

[0058] In this embodiment, the cover 1, the conductive voltage abutment ring 3, the fixing seat 2, the copper busbar fastening seat 4, and the assembly fastening seat 5 all have electrical conductivity, so that grounding protection can be achieved through each component when leakage occurs due to damage to the main insulation layer 62 of the cable. Specifically, copper is used to process and manufacture each part to improve the current carrying capacity of the device itself. It should be noted that the first channel 1a, the second channel 2b, the third channel 4a, and the fourth channel 5a are all for cable passage and are connected in sequence.

[0059] Furthermore, this utility model also provides a high-voltage cable 6, which includes the high-voltage cable shielding layer fixing device as described in any of the above embodiments. It should be noted that the detailed structure of the high-voltage cable shielding layer fixing device of the high-voltage cable 6 can be referred to the embodiments of the high-voltage cable shielding layer fixing device described above, and will not be repeated here. Since the high-voltage cable shielding layer fixing device described above is used in the high-voltage cable 6 of this utility model, the embodiments of the high-voltage cable 6 of this utility model include all the technical solutions of all embodiments of the high-voltage cable shielding layer fixing device described above, and the achieved technical effects are also completely the same, and will not be repeated here.

[0060] It should be noted that, in one embodiment, the high-voltage cable 6 comprises, from the inside out, a main body 61, a main insulation layer 62, a shielding layer 63, and an insulating sheath 64.

[0061] To better understand this utility model, the following is combined with... Figures 1 to 8 The technical solution of this utility model is described in detail below:

[0062] In this procedure, first remove the insulating sheath 64 from the end of the high-voltage cable 6. Then, fit the cover 1 onto the cable's shielding layer 63 and tighten it onto the end face of the cable's insulating sheath 64. Next, use two conductive fastening half-rings 32 to tightly adhere to the cover 1. The threaded holes and through holes of the two conductive fastening half-rings 32 are installed crosswise and secured with two cross-groove round-head M4×10 three-piece screws. Then, evenly spread the shielding layer 63 of the high-voltage cable 6 on the arc surfaces of the two conductive fastening half-rings 32. Then, secure the fixing seat 2 to the cover 1 with four cross-groove round-head M4×15 three-piece screws. Finally, screw in the copper busbar fastening seat 4 and the assembly fastening seat 5 in sequence. During the subsequent cable installation, fix the corresponding copper busbar and fixing plate in their respective positions using the copper busbar fastening seat 4 and the assembly fastening seat 5 in sequence.

[0063] The beneficial effects of this utility model include: 1. Using copper body to process and manufacture each part improves the current carrying capacity of the device itself; 2. The assembled locking assembly uses standardized fasteners to ensure the consistency and reliability of the integrated installation; 3. The cable shielding layer 63 adopts annular crimping, which has a larger contact area and a larger conductive current carrying surface, greatly avoiding the current concentration point of the conductor and extending the service life of the device; 4. The two types of fixed bases adopt large-pitch hexagonal fixing, which can use greater torque to fix and improve the vibration resistance.

[0064] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A high-voltage cable shielding layer fixing device, characterized in that, include: The cover has a first channel and has a stop side and a mounting side located on both sides of the first channel, the stop side being used to press against the end of the insulating sheath of the cable; A fixing base, located on the mounting side and detachably connected to the cover, together enclosing a receiving cavity, and having a second channel communicating with the receiving cavity; and A voltage-conducting abutment ring is disposed in the accommodating cavity, with one end of its axial direction abutting against the mounting side and the other end spaced apart from the fixing seat to form a clamping gap, which is used to clamp the shielding layer of the cable.

2. The high-voltage cable shielding layer fixing device according to claim 1, characterized in that, The end of the conductive voltage abutment ring away from the mounting side is provided with an arc-shaped convex surface to form a pressure abutment end face; The fixing seat has an arc-shaped concave surface on the side near the pressing end face.

3. The high-voltage cable shielding layer fixing device according to claim 1, characterized in that, The conductive voltage-resistant ring includes two conductive fastening half-rings, which are detachably connected and used to surround the outer periphery of the shielding layer when connected.

4. The high-voltage cable shielding layer fixing device according to claim 3, characterized in that, Each of the conductive fastening half-rings has a fastening screw hole and a fastening through hole at both ends. The conductive voltage abutment ring also includes two sets of fastening bolts. Each of the fastening bolts passes through the corresponding fastening through hole and is screwed into the corresponding fastening screw hole.

5. The high-voltage cable shielding layer fixing device according to claim 1, characterized in that, One of the cover and the fixing base is provided with a connecting screw hole, and the other is provided with a connecting through hole; The high-voltage cable shielding layer fixing device also includes a connecting bolt, which passes through the connecting through hole and is screwed into the connecting screw hole.

6. The high-voltage cable shielding layer fixing device according to claim 1, characterized in that, The fixed seat has a connecting cylinder protruding from one end away from the cover. The connecting cylinder has an external thread, and the second channel passes through the connecting cylinder from the fixed seat. The high-voltage cable shielding layer fixing device also includes a copper busbar fastening seat, which has a third channel. The inner wall of the third channel has an internal thread and is screwed onto the connecting cylinder.

7. The high-voltage cable shielding layer fixing device according to claim 6, characterized in that, The third channel includes a first threaded section and a first wiring section connected together in the direction away from the connecting cylinder, wherein the inner diameter of the first threaded section is larger than the inner diameter of the first wiring section.

8. The high-voltage cable shielding layer fixing device according to claim 6, characterized in that, The copper busbar fastening seat has an assembly cylinder protruding from one end away from the connecting cylinder. The assembly cylinder has an external thread, and the third channel extends from the copper busbar fastening seat through the assembly cylinder. The high-voltage cable shielding layer fixing device also includes an assembly fastening seat, which has a fourth channel. The inner wall of the fourth channel has an internal thread and is screwed onto the assembly cylinder.

9. The high-voltage cable shielding layer fixing device according to claim 8, characterized in that, The fourth channel includes a second threaded section and a second wiring section connected together in a direction away from the assembly cylinder, the second wiring section being progressively wider in a direction away from the second threaded section; and / or The cover, the fixing seat, the copper busbar fastening seat, and the assembly fastening seat are all electrically conductive.

10. A high-voltage cable, characterized in that, Includes the high-voltage cable shielding layer fixing device as described in any one of claims 1-9.

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