High-voltage cable joint structure with multi-layer insulation protection
Through multi-layer insulation protection and heat dissipation design, the problems of uneven interlayer bonding and insufficient heat dissipation in high-voltage cable joints are solved, improving connection stability and safety, extending service life, adapting to complex working conditions, and broadening application scenarios.
Patent Information
- Application Number
- CN202511548226.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-02-17
AI Technical Summary
Existing high-voltage cable joints suffer from uneven interlayer bonding, which easily forms hidden air gaps, significantly weakening the stability of the connection and increasing safety hazards. At the same time, the temperature at the joint continues to rise, and the inability to dissipate heat effectively leads to material aging.
It adopts a multi-layer insulation protection structure, including an inner sheath tube, an insulating shield tube, a protective outer shell, and an outer sheath tube. It is fixed by adjustable steel strips and copper wire protective mesh. Combined with a heat dissipation unit and a lead screw adjustment structure driven by a servo motor, it ensures that the layers fit together and enhances heat dissipation capacity. External interference is buffered by sealing gaskets and springs.
It effectively eliminates hidden air gaps between layers, improves connection stability and safety, extends service life, reduces power grid operation risks, adapts to complex working conditions, and broadens application scenarios.
Smart Images
Figure CN121546499A_ABST
Abstract
Description
Technical Field
[0002] This invention belongs to the field of cable joints, and specifically relates to a high-voltage cable joint structure with multi-layer insulation protection. Background Technology
[0003] High-voltage power cable conduit joints are used for connecting power cables themselves. High-voltage power cable conduit joints include ordinary joints, insulated joints, and plug joints. Different power cables require different joints. As a key connection component of the power transmission system, high-voltage cable joints are widely used in urban underground power transmission, cross-river underwater power transmission, and offshore platform power supply scenarios. Their insulation performance directly determines the safety and reliability of the power grid operation.
[0004] Existing high-voltage power cable joints still suffer from the following defects: uneven interlayer bonding, which easily leads to the formation of hidden air gaps inside, significantly weakening the stability of the connection and drastically increasing safety hazards. Simultaneously, the temperature at the joint continuously rises, and the inability to effectively dissipate heat accelerates material aging. Therefore, proposing a high-voltage cable joint with multi-layer insulation protection is highly necessary. Summary of the Invention
[0005] In order to solve the problems of uneven interlayer bonding in existing cable joints, which easily form hidden air gaps inside, significantly weakening the stability of the connection and increasing safety hazards, and the continuous rise in temperature at the joint, which cannot effectively dissipate heat and accelerates material aging, this invention provides a high-voltage cable joint structure with multi-layer insulation protection. A high-voltage cable joint structure with multi-layer insulation protection is provided. The high-voltage cable joint includes a first joint and a second joint. A mounting base is installed on the connection end of the first joint and the connection end of the second joint, respectively. An insulation component for insulating the first joint or the second joint is installed on each mounting base. The two insulation components are connected by a fixing component. The insulation assembly includes multiple inner sheaths for protecting the cable. Each inner sheath is fitted onto a cable in the first or second connector. An insulating shield is fitted onto the outside of the multiple inner sheaths. A protective outer shell is fitted onto the outside of the insulating shield. An outer sleeve is fitted onto the outside of the protective outer shell. Furthermore, an adjustable steel strap is fitted on the outer side of the outer tube, which secures the outer tube to the protective shell. Furthermore, a copper wire protective mesh is fixed to the end of the adjustable steel belt away from the mounting base; Furthermore, a clamp is fitted on the outer side of the inner sheath, which is located on the side of the insulating shield tube away from the mounting base, and the inner sheath is fixed to the corresponding cable by the clamp. Furthermore, multiple through-holes for positioning pins are machined circumferentially on the outer ring wall of the protective shell, and a positioning pin is inserted into each positioning pin hole. The end of each positioning pin is in close contact with the outer wall of the corresponding inner sheath tube. Furthermore, the fixing component includes two heat dissipation units, each heat dissipation unit is fitted onto an insulating component, and each heat dissipation unit is fixed to an adjacent mounting base. The distance between the two heat dissipation units is adjusted by multiple connecting units. Furthermore, the heat dissipation unit includes a heat dissipation jacket, which is fitted onto the insulating component. One end of the heat dissipation jacket is fixedly connected to the mounting base by bolts, and a connecting ring is fitted onto the other end of the heat dissipation jacket. Multiple positioning holes are machined equidistantly along the circumferential direction on the end face of the connecting ring. Each connecting unit is arranged in two oppositely positioned positioning holes, and the distance between the two connecting rings is adjusted by the multiple connecting units. Multiple anti-slip grooves are sequentially machined on the outer wall of the heat dissipation jacket along the extension direction of the cable axis. Multiple heat dissipation hole groups are also sequentially machined on the outer wall of the heat dissipation jacket along the extension direction of the cable axis, with each heat dissipation hole group located between two adjacent anti-slip grooves. Each heat dissipation hole group includes multiple heat dissipation holes, and the multiple heat dissipation holes in each group are machined equidistantly on the heat dissipation jacket circumferentially. Furthermore, the connecting unit includes a lead screw, which is inserted into two oppositely arranged positioning holes, and both ends of the lead screw extend to the back side of two connecting rings respectively. A servo motor is provided on the back side of one connecting ring. The housing of the servo motor is fixedly connected to the connecting ring, and the rotating end of the servo motor is connected to one end of the lead screw. Multiple nuts are fixedly connected to the back side of the other connecting ring, and each nut is fitted onto a lead screw and threadedly connected to the lead screw. Furthermore, multiple springs are provided equidistantly along the circumference between the two connecting rings, and the two ends of each spring are fixedly connected to an adjacent connecting ring. Furthermore, a sealing gasket is provided between the two connecting rings. One end of the sealing gasket is fixedly connected to the end of one of the two connecting rings, and the sealing gasket is located inside the multiple springs. The beneficial effects of this application compared to the prior art are: 1. This application provides a high-voltage cable joint structure with multi-layer insulation protection, effectively solving the problems of uneven interlayer bonding and hidden air gaps in existing high-voltage cable joints, significantly improving connection stability and operational safety. Existing high-voltage cable joints, due to insufficient interlayer bonding, are prone to forming hidden air gaps, leading to weakened connection stability and a sharp increase in safety hazards. This solution, through the precise adaptation design of multi-layer insulation components, allows the inner sheath to be independently fitted to each cable, with clamps ensuring tight fixation between the inner sheath and the cable. Simultaneously, the positioning pins on the outer ring wall of the protective outer shell can circumferentially press against the outer wall of the inner sheath, and the adjustable steel strip on the outer side of the outer sheath further secures the protective outer shell. This ensures that the inner sheath, insulating shield, protective outer shell, and outer sheath form a layered, tightly bonded structure from the inside out, completely eliminating hidden air gaps between layers, significantly improving the structural stability of the joint connection, fundamentally reducing safety risks caused by air gaps, and ensuring the reliability of power grid operation.
[0006] 2. This application provides a high-voltage cable joint structure with multi-layer insulation protection, which enhances the heat dissipation capacity of the joint, effectively slows down material aging, and extends the service life of the joint. Addressing the shortcomings of existing joints where temperature continuously rises and heat dissipation failure accelerates material aging, this solution incorporates a dedicated heat dissipation unit: a heat dissipation jacket is fitted onto the outside of the insulation component, with multiple sets of heat dissipation holes machined along the cable axis on its outer wall. Each set of heat dissipation holes is located between adjacent anti-slip grooves, expanding the heat exchange area through the heat dissipation holes and guiding air convection through the anti-slip grooves to improve heat dissipation efficiency. Simultaneously, one end of the heat dissipation jacket is bolted to the mounting base, allowing for rapid heat conduction from inside the joint to the mounting base and outward diffusion, achieving effective control of high temperatures. This heat dissipation structure significantly reduces the operating temperature of the joint, preventing insulation material aging due to overheating, extending the overall service life of the high-voltage cable joint, and reducing power grid maintenance costs.
[0007] 3. The high-voltage cable joint structure with multi-layer insulation protection provided in this application can effectively improve the connection adaptability and anti-interference ability, and further ensure the operational stability of the joint. The connection unit in the fixing component of this solution adopts a structure of lead screw and servo motor cooperation. The lead screw can be driven to rotate by the servo motor to adjust the distance between the two heat dissipation units, adapt to the joint connection requirements under different installation scenarios, and ensure that the joint is always in a tight connection state. At the same time, the spring and the inner sealing gasket ring set along the circumference between the two connecting rings can effectively buffer the interference forces such as external vibration and impact, and prevent the joint from loosening due to external forces, further enhancing the stability of the joint connection. This solves the problem that the stability of existing joints is easily affected by the environment under complex working conditions (such as underground power transmission and underwater power transmission), and broadens the applicable scenarios of high-voltage cable joints. Attached Figure Description
[0008] Figure 1A three-dimensional structural schematic diagram of a high-voltage cable joint with multi-layer insulation protection provided by the present invention; Figure 2 A cross-sectional structural schematic diagram of the multi-layer insulation protection high-voltage cable joint provided by the present invention. Figure 3 A partial structural schematic diagram of the high-voltage cable joint with multi-layer insulation protection provided by the present invention; Figure 4 A partial structural diagram of the insulation component of the multi-layer insulation protection high-voltage cable joint provided by the present invention; Figure 5 This is a partially enlarged structural diagram of the high-voltage cable joint with multi-layer insulation protection provided by the present invention.
[0009] In the diagram: 1 First connector; 2 Second connector; 3 Mounting base; 4 Insulation component; 401 Inner sheath; 402 Insulation shielding tube; 403 Protective outer shell; 404 Outer outer shell; 405 Adjustable steel strip; 406 Copper wire protective mesh; 4061 Clamp; 4062 Positioning pin; 5 Fixing component; 501 Heat dissipation outer shell; 502 Connecting ring; 503 Spring; 504 Sealing gasket ring; 505 Positioning hole; 5071 Heat dissipation hole; 5072 Anti-slip groove; 5073 Servo motor; 5074 Lead screw. Detailed Implementation
[0010] Specific implementation method one: Combining Figures 1 to 4 This embodiment describes a high-voltage cable joint structure with multi-layer insulation protection. The high-voltage cable joint includes a first joint 1 and a second joint 2. A mounting base 3 is installed on the connection end of the first joint 1 and the connection end of the second joint 2 respectively. An insulation component 4 for insulating the first joint 1 or the second joint 2 is installed on each mounting base 3. The two insulation components 4 are connected by a fixing component 5. The insulation component 4 includes multiple inner sheaths 401 for protecting the cables. Each inner sheath 401 is fitted onto one cable in the first connector 1 or the second connector 2. An insulating shield 402 is fitted on the outside of the multiple inner sheaths 401. A protective outer shell 403 is fitted on the outside of the insulating shield 402. An outer outer shell 404 is fitted on the outside of the protective outer shell 403. An adjustable steel strap 405 is fitted on the outside of the outer sleeve 404, which is used to fix the outer sleeve 404 to the protective shell 403. A copper wire protective mesh 406 is fixed to the end of the adjustable steel belt 405 away from the mounting base 3.
[0011] In this embodiment, the insulation component 4 has a multi-layer design. The inner sheath 401 can effectively provide primary protection for each cable in the cable. The insulating shielding tube 402 is tightly fitted with the inner sheath 401 to form an effective electric field shielding layer. Then, the protective shell 403 is assembled along the outside of the insulating shielding tube 402 to further improve the protective performance. To improve the ease of assembly, external threads can be machined on the outer wall of the insulating shielding tube 402 and internal threads can be machined on the inner wall of the protective shell 403. Through the thread engagement of the external and internal threads, the protective shell 403 and the insulating shielding tube 402 can achieve stable assembly. Then, the outer sleeve 404 is fitted onto the surface of the protective shell 403 to provide additional physical protection for the joint. Finally, an adjustable steel strip 405 is used to wrap around and fix the outer sleeve 404. The tightness can be flexibly adjusted according to the actual working conditions to ensure no risk of shaking. The protective effect is further enhanced by the copper wire protective mesh 406.
[0012] Specific Implementation Method Two: Combining Figures 1 to 2 and Figure 5 This embodiment differs from specific embodiment one in that the fixing component 5 includes two heat dissipation units, each heat dissipation unit is fitted onto an insulating component 4, and each heat dissipation unit is fixed to an adjacent mounting base 3. The distance between the two heat dissipation units is adjusted by multiple connecting units. The heat dissipation unit includes a heat dissipation jacket 501, which is fitted onto the insulating component 4. One end of the heat dissipation jacket 501 is fixedly connected to the mounting base 3 by bolts. A connecting ring 502 is fitted onto the other end of the heat dissipation jacket 501. Multiple positioning holes 505 are machined equidistantly along the circumferential direction on the end face of the connecting ring 502. Each connecting unit is arranged in two oppositely arranged positioning holes 505. The distance between the two connecting rings 502 can be adjusted by multiple connecting units. Multiple anti-slip grooves 5072 are sequentially machined on the outer wall of the heat dissipation jacket 501 along the extension direction of the cable axis. Multiple heat dissipation hole groups are also sequentially machined on the outer wall of the heat dissipation jacket 501 along the extension direction of the cable axis. Each heat dissipation hole group is located between two adjacent anti-slip grooves 5072. Each heat dissipation hole group includes multiple heat dissipation holes 5071. The multiple heat dissipation holes 5071 in each heat dissipation hole group are machined equidistantly on the heat dissipation jacket 501 in the circumferential direction. The connecting unit includes a lead screw 5074, which is inserted into two opposing positioning holes 505. Both ends of the lead screw 5074 extend to the back sides of two connecting rings 502. A servo motor 5073 is mounted on the back side of one connecting ring 502. The housing of the servo motor 5073 is fixedly connected to the connecting ring 502, and the rotating end of the servo motor 5073 is connected to one end of the lead screw 5074. Multiple nuts are fixedly connected to the back side of the other connecting ring 502. Each nut is fitted onto a corresponding lead screw 5074 and threadedly connected to it. Other components and connection methods are the same as in Specific Embodiment 1.
[0013] In this embodiment, heat dissipation holes 5071 and anti-slip grooves 5072 are added to the outside of the heat dissipation jacket 501. The heat generated by the cable connector during operation can be dissipated to the surrounding environment through the heat dissipation holes 5071, reducing the internal temperature of the connector and improving the heat dissipation efficiency of the cable connector. This avoids problems such as insulation aging and performance degradation caused by overheating, and extends the service life of the connector. The anti-slip grooves 5072 increase the friction of the shell surface, making it easier for operators to hold during installation and disassembly and preventing slippage. The servo motor 5073 in the connecting unit is a power element used to drive the lead screw 5074 to rotate axially. With the rotation of the lead screw 5074, the nut that is threaded with it is driven to slide along the axial direction of the lead screw. That is, under the sliding action of the nut, the two connecting rings 502 are driven to move towards the center or separate to both sides, thereby realizing the adjustment of the distance between the two connecting rings 502.
[0014] Specific implementation method three: Combining Figure 1 , Figure 2 and Figure 5 This embodiment differs from Specific Embodiment Two in that multiple springs 503 are equidistantly arranged circumferentially between the two connecting rings 502, and both ends of each spring 503 are fixedly connected to an adjacent connecting ring 502. Other components and connection methods are the same as in Specific Embodiment Two.
[0015] Specific Implementation Method 4: In this implementation method, the spring 503 absorbs installation stress and operating vibration through elastic deformation, which not only ensures the reliable fit of the two heat dissipation jackets 501, but also provides a dynamically stable operating environment for the high-voltage cable joint, significantly improving the reliability of the equipment under complex working conditions.
[0016] Specific implementation method five: Combining Figure 1 , Figure 2 and Figure 5This embodiment differs from Specific Embodiment Three in that a sealing gasket 504 is also provided between the two connecting rings 502. One end of the sealing gasket 504 is fixedly connected to the end of one of the two connecting rings 502, and the sealing gasket 504 is disposed inside the plurality of springs 503. Other components and connection methods are the same as in Specific Embodiment Three.
[0017] In this embodiment, when the two heat dissipation jackets 501 are fully fitted, the sealing gasket 504 undergoes elastic deformation under the squeezing action of the positioning ring 502, so that the sealing gasket 504 always covers the connection between the two heat dissipation jackets 501, effectively preventing external pollutants such as dust and moisture from entering the interior of the joint.
[0018] Specific implementation method six: Combining Figures 1 to 4 This embodiment differs from Specific Embodiment Four in that a clamp 4061 is fitted onto the outer side of the inner sheath 401. The clamp 4061 is located on the side of the insulating shielding tube 402 away from the mounting base 3, and the inner sheath 401 is fixed to the corresponding cable by the clamp 4061. Other components and connection methods are the same as in Specific Embodiment Four.
[0019] In this embodiment, the tightening action of the clamp 4061 further secures the inner sheath 401 and the first connector 1 or the second connector 2 inside, preventing them from loosening or shifting during operation. This increases the reliability of the cable connector's fixation, reduces problems such as poor contact and overheating caused by loose connectors, and improves the stability and safety of the connector.
[0020] Specific implementation method seven: Combining Figures 1 to 4 This embodiment differs from Specific Embodiment Five in that multiple through-holes are machined circumferentially on the outer ring wall of the protective shell 403. A positioning pin 4062 is inserted into each positioning pin hole, and the end of each positioning pin 4062 is in close contact with the outer wall of a corresponding inner sheath tube 401. Other components and connection methods are the same as in Specific Embodiment Five.
[0021] In this embodiment, the positioning pin 4062 is inserted into the positioning hole on the protective shell 403 and fixed so that the positioning pin 4062 presses against the inner protective sleeve 401 to prevent relative movement during operation.
[0022] The present invention has been disclosed above with preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
[0023] Working principle The working process of the high-voltage cable joint structure with multi-layer insulation protection provided in this application is as follows: The first connector 1 is precisely inserted into the inner sheath tube 401 to ensure accurate positioning and a secure connection. Then, the insulating shielding tube 402 is fitted onto the outer side of the inner sheath tube 401, ensuring a tight fit and forming an effective electric field shielding layer. Next, the protective outer shell 403 is tightened along the matching thread on the outer side of the insulating shielding tube 402 to further enhance the protective performance. Then, the outer sleeve 404 is fitted onto the surface of the protective outer shell 403 to provide additional physical protection for the connector. Finally, an adjustable steel band 405 is used to wrap around and fix the outer sleeve 404, adjusting the tightness flexibly according to the actual working conditions to ensure no risk of shaking. The protective effect is further enhanced by the copper wire protective mesh 406. Two heat sink housings 501 are fixed to their respective mounting bases 3. A pre-machined insertion guide structure is provided at the connecting end of the two heat sink housings 501. The two heat sink housings 501 are then joined together along the insertion guide structure. During this process, the positioning ring 502 moves synchronously with the heat sink housings 501, and the sealing gasket 504 gradually compresses as the distance between the two positioning rings 502 decreases. When the two heat sink housings 501 are fully fitted, the sealing gasket 504 undergoes elastic deformation under the compression of the two positioning rings 502, ensuring that the sealing gasket 504 always covers the connection point of the two heat sink housings 501. This effectively prevents dust from entering. When external pollutants such as water vapor enter the joint, the spring 503 absorbs the installation stress and operating vibration through elastic deformation, ensuring the reliable fit of the two heat dissipation sleeves 501 and providing a dynamically stable operating environment for the high-voltage cable joint, significantly improving the reliability of the equipment under complex working conditions. The servo motor 5073 drives the lead screw 5074 to rotate synchronously. With the rotation of the lead screw 5074, the nut that is threaded with it slides along the axis of the lead screw. Under the sliding action of the nut, the two connecting rings 502 are driven to move towards the center or separate to both sides, thereby adjusting the distance between the two connecting rings 502.
Claims
1. A high-voltage cable joint structure with multi-layer insulation protection, the high-voltage cable joint including a first joint (1) and a second joint (2), wherein a mounting base (3) is respectively installed on the connecting end of the first joint (1) and the connecting end of the second joint (2), characterized in that: Each mounting base (3) is equipped with an insulating assembly (4) for insulating the first connector (1) or the second connector (2), and the two insulating assemblies (4) are connected by a fixing assembly (5); The insulation component (4) includes multiple inner sheaths (401) for protecting the cable. Each inner sheath (401) is fitted onto a cable in the first connector (1) or the second connector (2). The outer side of the multiple inner sheaths (401) is fitted with an insulating shield (402). The outer side of the insulating shield (402) is fitted with a protective shell (403). The outer side of the protective shell (403) is fitted with an outer sleeve (404).
2. The high-voltage cable joint structure with multi-layer insulation protection according to claim 1, characterized in that: An adjustable steel band (405) is fitted on the outside of the outer tube (404), which fixes the outer tube (404) to the protective shell (403).
3. The high-voltage cable joint structure with multi-layer insulation protection according to claim 2, characterized in that: A copper wire protective mesh (406) is fixed to the end of the adjustable steel belt (405) away from the mounting base (3).
4. The high-voltage cable joint structure with multi-layer insulation protection according to claim 3, characterized in that: The outer side of the inner sheath (401) is fitted with a clamp (4061). The clamp (4061) is located on the side of the insulating shield tube (402) away from the mounting base (3). The inner sheath (401) is fixed to the corresponding cable by the clamp (4061).
5. A high-voltage cable joint structure with multi-layer insulation protection according to claim 4, characterized in that: The outer ring wall of the protective shell (403) has multiple through-holes in the circumferential direction. A positioning pin (4062) is inserted into each positioning pin hole. The end of each positioning pin (4062) is in close contact with the outer wall of the corresponding inner sheath tube (401).
6. A high-voltage cable joint structure with multi-layer insulation protection according to claim 5, characterized in that: The fixed component (5) includes two heat dissipation units, each heat dissipation unit is fitted onto an insulating component (4), and each heat dissipation unit is fixed to an adjacent mounting base (3). The distance between the two heat dissipation units is adjusted by multiple connecting units.
7. A high-voltage cable joint structure with multi-layer insulation protection according to claim 6, characterized in that: The heat dissipation unit includes a heat dissipation jacket (501), which is fitted onto the insulating component (4). One end of the heat dissipation jacket (501) is fixedly connected to the mounting base (3) by bolts. A connecting ring (502) is fitted onto the other end of the heat dissipation jacket (501). Multiple positioning holes (505) are machined equidistantly along the circumferential direction on the end face of the connecting ring (502). Each connecting unit is arranged in two oppositely arranged positioning holes (505). The distance between the two connecting rings (502) can be adjusted by multiple connecting units. Multiple anti-slip grooves (5072) are sequentially machined on the outer wall of the heat dissipation jacket (501) along the extension direction of the cable axis. Multiple heat dissipation hole groups are also sequentially machined on the outer wall of the heat dissipation jacket (501) along the extension direction of the cable axis. Each heat dissipation hole group is located between two adjacent anti-slip grooves (5072). Each heat dissipation hole group includes multiple heat dissipation holes (5071). The multiple heat dissipation holes (5071) in each heat dissipation hole group are machined equidistantly on the heat dissipation jacket (501) in the circumferential direction.
8. A high-voltage cable joint structure with multi-layer insulation protection according to claim 7, characterized in that: The connecting unit includes a lead screw (5074), which is inserted into two oppositely arranged positioning holes (505). Both ends of the lead screw (5074) extend to the back of two connecting rings (502). A servo motor (5073) is provided on the back of one connecting ring (502). The housing of the servo motor (5073) is fixedly connected to the connecting ring (502). The rotating end of the servo motor (5073) is connected to one end of the lead screw (5074). Multiple nuts are fixedly connected to the back of the other connecting ring (502). Each nut is fitted onto a lead screw (5074) and threadedly connected to the lead screw (5074).
9. A high-voltage cable joint structure with multi-layer insulation protection according to claim 8, characterized in that: Multiple springs (503) are provided equidistantly along the circumference between the two connecting rings (502), and the two ends of each spring (503) are fixedly connected to a neighboring connecting ring (502).
10. A high-voltage cable joint structure with multi-layer insulation protection according to claim 9, characterized in that: A sealing gasket (504) is also provided between the two connecting rings (502). One end of the sealing gasket (504) is fixedly connected to the end of one of the two connecting rings (502), and the sealing gasket (504) is located inside the multiple springs (503).