Stranded carbon fiber composite core wire middle lap type joint tube

Abstract

This invention discloses a stranded carbon fiber composite core conductor with an intermediate overlapping splice, relating to the field of conductor splice technology. It includes a flexible inner cylinder, an inner steel pipe, and an outer aluminum pipe. The flexible inner cylinder is interlocked with the outer wall of the carbon core through a spiral groove on its inner wall. The flexible inner cylinder is fixed inside the inner steel pipe by first and second limiting rings on both sides. The inner steel pipe is connected to the flexible inner cylinder through the interlocking of slots and blocks. An outer aluminum pipe is disposed on the outside of the inner steel pipe, and the outer aluminum pipe is pressed against the outside of the first and second conductors. This invention, by incorporating the flexible inner cylinder, inner steel pipe, and outer aluminum pipe, achieves flexible and uniform fixation of the carbon core, improves the structural integrity of the carbon core at the splice, enhances the tensile strength of the carbon core, and extends the fatigue life of the splice under long-term alternating loads.

Description

Technical Field

[0001] This invention relates to the field of conductor splicing technology, specifically to a splicing tube with an intermediate overlap of stranded carbon fiber composite core conductors. Background Technology

[0002] Stranded carbon fiber composite conductors have been gradually applied in high-voltage and ultra-high-voltage transmission lines due to their excellent properties such as light weight, high strength, low sag and high temperature resistance. Compared with traditional steel-cored aluminum stranded conductors, carbon fiber composite conductors have significant advantages in mechanical strength and electrical performance, and are especially suitable for power transmission projects in complex environments such as long spans and heavy icing. Currently, most splicing tubes adopt axial pressing. There is a lack of effective interlocking structure between the carbon core and the inner wall of the splicing tube. It is easy for axial slippage to occur due to vibration or tension fluctuation during long-term operation, which affects the reliability of the splice. Moreover, there is a lack of flexible buffer structure during the pressing process. The carbon fiber core material is prone to microcracks or fractures due to excessive local pressure, which reduces the overall mechanical strength.

[0003] Patent CN116505471B discloses a splicing tube for carbon fiber composite core conductors and its preparation method. The above patent reduces the possibility of splicing tube breakage.

[0004] The aforementioned patent addresses this issue by first attaching a connecting tube to the outside of the carbon fiber composite core conductor and then pressing the sleeve onto the connecting tube. This approach distributes some of the mechanical and electrical loads of the conductor, increasing the overall system safety factor. Finally, the protective sleeve assembly is installed on the outer wall of the protective shell, distributing most of the mechanical loads. In the event of a breakage caused by extreme weather conditions such as strong winds, the protective sleeve assembly can replace the connecting tube to continue bearing the tension from the conductor, preventing the conductor from falling and causing a larger accident. However, there is still room for improvement in the protection of the carbon fiber core material during the pressing process.

[0005] Therefore, this application proposes a stranded carbon fiber composite core conductor with an interlocking joint that can protect the carbon fiber core material and prevent misalignment. Summary of the Invention

[0006] The purpose of this invention is to provide a stranded carbon fiber composite core conductor with an interlocking splice type splice tube, in order to solve the technical problems mentioned in the background art, namely, the lack of an effective interlocking structure between the carbon core and the inner wall of the splice tube, which makes it easy for axial slippage to occur due to vibration or tension fluctuations during long-term operation, and the lack of a flexible buffer structure during the pressing process, which makes the carbon fiber core material prone to microcracks or fractures due to excessive local pressure, thus reducing the overall mechanical strength.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a stranded carbon fiber composite core conductor with intermediate overlapping joint, comprising a flexible inner cylinder, an inner steel pipe, and an outer aluminum pipe. The flexible inner cylinder is interlocked with the outer wall of the carbon core through a spiral groove on its inner wall. The carbon core is formed by winding a first stranded wire, a second stranded wire, and a third stranded wire. The flexible inner cylinder is fixed inside the inner steel pipe by a first limiting ring and a second limiting ring on both sides. The first limiting ring is connected to the first conductor through a first rubber pad, and the second limiting ring is connected to the second conductor through a second rubber pad. The inner steel pipe is connected to the flexible inner cylinder through the interlocking of a slot and a locking block. An outer aluminum pipe is provided on the outside of the inner steel pipe, and the outer aluminum pipe is pressed against the outside of the first conductor and the second conductor.

[0008] Preferably, the inner wall of the flexible inner cylinder is provided with a spiral groove, the inner wall of the spiral groove is interlocked with the outer wall of the carbon core, and the carbon core includes a first stranded wire, a second stranded wire and a third stranded wire, which are spirally wound counterclockwise to form the carbon core.

[0009] Preferably, a first limiting ring is provided at the front end of the outer wall of the flexible inner cylinder, and a second limiting ring is provided at the rear end of the outer wall of the flexible inner cylinder. The side of the outer wall of the first limiting ring is in contact with the first rubber pad, and the side of the outer wall of the second limiting ring is in contact with the second rubber pad.

[0010] Preferably, the first rubber pad is fitted on the outside of the carbon core, the outer side of the first rubber pad is in contact with the first wire, and the first rubber pad is disposed between the first limiting ring and the first wire.

[0011] Preferably, a second rubber pad is also fitted on the outside of the carbon core, the outer side of the second rubber pad is in contact with the second wire, and the second rubber pad is disposed between the second limiting ring and the second wire.

[0012] Preferably, an inner steel pipe is provided between the second limiting ring and the first limiting ring, with the front end of the outer wall of the inner steel pipe fitting against the first limiting ring and the rear end of the outer wall of the inner steel pipe fitting against the second limiting ring.

[0013] Preferably, the inner wall of the inner steel pipe is provided with a groove, which extends from the front end of the inner wall to the rear end of the inner wall. The inner wall of the groove and the outer wall of the block are interlocked, and the block is provided on the outer wall of the flexible inner cylinder.

[0014] Preferably, the inner steel pipe is sleeved on the outside of the flexible inner cylinder, and the inner steel pipe is pressed onto the outer wall of the flexible inner cylinder by a press, thus pressing the flexible inner cylinder onto the outer wall of the carbon core.

[0015] Preferably, an external aluminum tube is provided on the outer side of the inner steel pipe, and the inner side of the external aluminum tube is in contact with the outer side of the first conductor and the second conductor.

[0016] Preferably, the external aluminum tube is sleeved on the outside of the internal steel tube, and the external aluminum tube is pressed into the outer wall of the first and second conductors by a press.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by incorporating an external aluminum tube, an internal steel tube, a flexible inner cylinder, a locking block, and a locking groove, achieves a transformation of the compression load from rigid impact to flexible and uniform transmission. This solves the problem that rigid compression can easily cause microcracks or fractures in the carbon fiber core due to excessive local pressure. The external aluminum tube provides external electrical connection and overall protection, while the internal steel tube serves as an intermediate load-bearing layer. The flexible inner cylinder directly contacts the carbon core. The interlocking structure of the locking block and locking groove creates circumferential positioning between the internal steel tube and the flexible inner cylinder, preventing relative rotation. During the compression process, the flexible inner cylinder can elastically deform, evenly distributing the radial pressure transmitted by the internal steel tube to the surface of the carbon core. This avoids pressure concentration at a local point in the carbon fiber bundle, preventing the generation of microcracks, improving the structural integrity of the carbon core at the joint, increasing the tensile strength of the carbon core, reducing the risk of joint failure caused by carbon fiber fracture, and extending the fatigue life of the splice tube under long-term alternating loads. 2. This invention, by incorporating an inner steel pipe, a flexible inner cylinder, and a spiral groove, achieves a spiral full-contact interlocking and locking mechanism between the carbon core and the flexible inner cylinder. This solves the problem of axial slippage of the carbon core due to the lack of an effective interlocking structure between the flexible inner cylinder and the carbon core. The lead and direction of the spiral groove interlock with the spiral pattern on the outer wall of the carbon core. After pressing, the spiral groove on the inner wall of the flexible inner cylinder is embedded in each spiral pattern on the outer wall of the carbon core, forming a multi-turn spiral contact surface. This converts axial tension into radial pressure and friction, solving the problem of insufficient anti-slip capability when the splice tube is fixed solely by friction. This improves the tensile strength of the splice tube. Furthermore, when the conductor is subjected to dynamic loads such as wind vibration and icing, the spiral interlocking structure can adaptively adjust the contact pressure to prevent axial movement of the carbon core and ensure a stable mechanical connection at the splice point over a long period of time. 3. This invention, by incorporating an inner steel pipe, a flexible inner cylinder, a first limiting ring, and a second limiting ring, achieves bidirectional axial positioning of the flexible inner cylinder within the inner steel pipe. This solves the problem of potential axial displacement of the flexible inner cylinder during pressing or operation. The first and second limiting rings are fixed to the front and rear ends of the outer wall of the flexible inner cylinder, respectively, and are tightly fitted to the two ends of the inner steel pipe. The limiting rings are fixed to the ends of the inner steel pipe through an interference fit, restricting the degree of freedom of movement of the flexible inner cylinder from both axial sides. Simultaneously, the groove on the inner wall of the inner steel pipe engages with the block on the outer wall of the flexible inner cylinder, further restricting circumferential rotation. This solves the problem of the flexible inner cylinder being easily squeezed out or shifting position under pressing force, leading to uneven stress on the carbon core. It ensures that the flexible inner cylinder remains in a fixed position during pressing, allowing the spiral groove to be precisely aligned with the carbon core. Even if the conductor is subjected to repeated bending or temperature changes during operation, the flexible inner cylinder will not move axially, thus maintaining the long-term geometric stability of the connection structure. 4. This invention, by incorporating a flexible inner cylinder, an inner steel pipe, a first rubber pad, and a second rubber pad, achieves elastic buffering and radial sealing between the limiting ring and the conductor end. This solves the problem of rigid limiting rings directly contacting the conductor, failing to buffer impact loads, and easily damaging the conductor. The first rubber pad is positioned between the first limiting ring and the first conductor, and the second rubber pad is positioned between the second limiting ring and the second conductor. After compression, the rubber pads are in a compressed state, absorbing the axial tension of the conductor and the impact energy under impact loads, preventing hard contact from causing the aluminum stranded wire to loosen or the carbon core end to be damaged. Simultaneously, the first and second rubber pads form a radial sealing ring, preventing moisture from seeping into the carbon core area along the conductor's axial direction, improving the impact resistance and sealing protection level of the splice tube. Furthermore, the rebound force of the rubber pads provides continuous pre-tightening force, resisting the loosening tendency during long-term operation and compensating for dimensional changes caused by the thermal expansion and contraction of the conductor, allowing the splice tube to adapt to varying working environments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the inner steel pipe and the outer aluminum pipe sleeved on the outside of the carbon core according to the present invention; Figure 3 This is a schematic diagram of the structure of the internal steel pipe being pulled out from the carbon core according to the present invention; Figure 4 This is a schematic diagram of the carbon core and flexible inner cylinder interlocking structure of the present invention; Figure 5 This is a schematic diagram of the spiral groove structure of the present invention; Figure 6 This is a schematic diagram of the flexible inner cylinder being pulled out from the inner steel pipe according to the present invention. Figure 7 This is a schematic diagram of the flexible inner cylinder structure of the present invention; Figure 8 This is a schematic cross-sectional view of the flexible inner cylinder of the present invention.

[0019] In the diagram: 1. Flexible inner cylinder; 2. Locking block; 3. First limiting ring; 4. Second limiting ring; 5. Spiral groove; 6. Inner steel pipe; 7. Locking groove; 8. Outer aluminum pipe; 9. First rubber pad; 10. Second rubber pad; 11. First conductor; 12. Second conductor; 13. First stranded wire; 14. Second stranded wire; 15. Third stranded wire. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for 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. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 An embodiment of the present invention provides: a stranded carbon fiber composite core conductor with an intermediate overlapping joint tube, wherein an inner steel pipe 6 is provided between the second limiting ring 4 and the first limiting ring 3, and a groove 7 is provided on the inner wall side of the inner steel pipe 6. The groove 7 extends from the front end of the inner wall of the inner steel pipe 6 to the rear end of the inner wall. The inner wall of the groove 7 is interlocked with the outer wall of the locking block 2. The locking block 2 is provided on the outer wall side of the flexible inner cylinder 1. Furthermore, the operator first places the inner steel pipe 6 on the outside of the flexible inner cylinder 1, and makes the groove 7 on the inner wall of the inner steel pipe 6 engage with the locking block 2 on the outer wall of the flexible inner cylinder 1. The groove 7 extends from the front end to the rear end of the inner wall of the inner steel pipe 6, and cooperates with the locking block 2 of the flexible inner cylinder 1 to ensure that there is no relative rotation or axial sliding between the inner steel pipe 6 and the flexible inner cylinder 1, which can enhance the stability of the connection. Then, the operator moves the inner steel pipe 6 axially until the two ends of the inner steel pipe 6 are completely overlapped with the two ends of the flexible inner cylinder 1. At this time, the inner steel pipe 6 completely covers the outer wall of the flexible inner cylinder 1. Then, the first limiting ring 3 and the second limiting ring 4 are fixed to the two ends of the inner steel pipe 6 respectively. The fixing method adopts an interference fit, so that the first limiting ring 3 and the second limiting ring 4 are tightly attached to the end face of the inner steel pipe 6, and are locked together by the protruding structure on the inner side of the ring and the groove on the outer side of the inner steel pipe 6 to prevent the flexible inner cylinder 1 from moving axially when subjected to force. Then, the operator unwinds the front end of the first conductor 11 and spirals the first stranded wire 13, the second stranded wire 14, and the third stranded wire 15 inside the first conductor 11 in a counterclockwise direction to form a tight carbon core structure. The counterclockwise spiral direction is consistent with the twisting direction of the first conductor 11 itself, which can maintain the original tension distribution of the carbon fiber bundle and avoid fiber loosening or stress concentration caused by reverse winding. Then, the operator unwinds the front end of the second conductor 12 and spirals the first stranded wire 13, the second stranded wire 14, and the third stranded wire 15 inside the second conductor 12 in a counterclockwise direction to form a carbon core, ensuring that the carbon cores of the first conductor 11 and the second conductor 12 have the same structural characteristics and mechanical properties. Then, the operator places the first rubber pad 9 on the outside of the carbon core of the first conductor 11, and then places the second rubber pad 10 on the outside of the carbon core of the second conductor 12. Next, the assembled flexible inner cylinder 1, inner steel pipe 6 and end limiting rings are placed on the carbon core of the first conductor 11, so that the carbon core passes through the internal channel of the flexible inner cylinder 1. The first rubber pad 9 is located between the first limiting ring 3 and the end face of the first conductor 11, and the second rubber pad 10 is located between the second limiting ring 4 and the end face of the second conductor 12. The first rubber pad 9 and the second rubber pad 10 play a buffering and sealing role. Finally, the operator places the outer aluminum pipe 8 on the outside of the first conductor 11 to prepare for the subsequent crimping connection.

[0024] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5The present invention provides an embodiment of a stranded carbon fiber composite core conductor with an intermediate overlapping joint tube. The inner wall of the flexible inner cylinder 1 is provided with a spiral groove 5. The inner wall of the spiral groove 5 is interlocked with the outer wall of the carbon core. The carbon core includes a first stranded wire 13, a second stranded wire 14 and a third stranded wire 15. The first stranded wire 13, the second stranded wire 14 and the third stranded wire 15 are spirally wound counterclockwise to form the carbon core. Furthermore, after the carbon core preforming of the first conductor 11 and the second conductor 12 is completed, the operator first connects the carbon core ends in the first conductor 11 and the carbon core ends in the second conductor 12 in a spiral manner, aligning the end faces of the two carbon cores, so that the fiber bundles of their respective first stranded wire 13, second stranded wire 14 and third stranded wire 15 intertwine with each other, and then screws the carbon cores together in a clockwise direction until the two carbon cores are tightly connected into a continuous carbon core structure. Clockwise screwing can form a fiber crossing angle opposite to the original stranding direction. The reverse crossing structure will generate a self-locking effect when subjected to axial tension, which increases the friction between the fiber bundles and prevents the carbon core connection from slipping or loosening under tension. At the same time, clockwise screwing can also make the fibers at the ends of the two carbon cores evenly distributed, avoid local stress concentration, and improve the fatigue resistance of the joint. After completing the spiral connection of the carbon core, the operator moves the inner steel pipe 6 from the outside of the carbon core of the first conductor 11, so that the inner steel pipe 6 slowly slides along the axis to the interface between the first conductor 11 and the second conductor 12. During the movement, the inner steel pipe 6 needs to be rotated in a counterclockwise direction, and the rotation direction is consistent with the spiral pattern of the outer wall of the carbon core. The inner wall of the flexible inner cylinder 1 is provided with a spiral groove 5. The lead and rotation direction of the spiral groove 5 match the spiral pattern formed by the counterclockwise winding of the outer wall of the carbon core. When the inner steel pipe 6 rotates counterclockwise, the spiral groove 5 of the inner wall of the flexible inner cylinder 1 can be screwed into the spiral pattern of the outer wall of the carbon core, forming a tight surface contact, reducing the frictional resistance between the flexible inner cylinder 1 and the carbon core, avoiding the carbon fiber from being scratched or broken, and at the same time ensuring that the spiral groove 5 and each spiral pattern of the outer wall of the carbon core are precisely aligned to achieve uniform radial contact. As the inner steel pipe 6 continues to rotate counterclockwise and move axially, the degree of fit between the spiral groove 5 and the outer wall of the carbon core increases until the inner steel pipe 6 moves completely to the outside of the carbon core at the interface between the first conductor 11 and the second conductor 12, and completely wraps the spiral connection point at the interface. At this time, a multi-turn spiral contact surface is formed between the spiral groove 5 of the flexible inner cylinder 1 and the outer wall of the carbon core, which converts the axial tensile force on the carbon core into radial pressure and friction on the spiral contact surface. When the conductor is subjected to vibration or bending load, the guiding effect of the spiral groove 5 can keep the flexible inner cylinder 1 and the carbon core in a relatively stable positional relationship, preventing the joint pipe from axially shifting during long-term operation.

[0025] Please see Figure 3, Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 An embodiment of the present invention provides: a stranded carbon fiber composite core conductor with an intermediate overlapping splice tube, wherein a first limiting ring 3 is provided at the front end of the outer wall of the flexible inner cylinder 1, and a second limiting ring 4 is provided at the rear end of the outer wall of the flexible inner cylinder 1. The outer side of the first limiting ring 3 is in contact with a first rubber pad 9, and the outer side of the second limiting ring 4 is in contact with a second rubber pad 10. An inner steel pipe 6 is pressed onto the outer wall of the flexible inner cylinder 1 by a press, and the inner steel pipe 6 presses the flexible inner cylinder 1 onto the outer wall of the carbon core. Furthermore, after the inner steel pipe 6 is moved to the outside of the carbon core at the interface between the first conductor 11 and the second conductor 12, the operator places the crimping mold of the hydraulic press on the outside of the inner steel pipe 6. The press first applies pressure from the middle position of the inner steel pipe 6. Applying pressure from the middle position can make the stress generated by the inner steel pipe 6 during crimping deformation symmetrically transmitted from the middle to both ends, avoiding material accumulation or pipe bending deformation caused by unidirectional crimping, thereby ensuring the straightness and concentricity of the entire joint pipe after crimping. After crimping is completed, the press maintains the pressure for several seconds to allow the material of the flexible inner cylinder 1 to fully creep and fill the tiny gap between the spiral groove 5 and the carbon core, forming the initial fitting and locking force. Then, the press moves gradually from the middle to the left, applying the same radial pressure for each pressing step (e.g., 10 mm) until it reaches the left edge of the inner steel pipe 6. This segmented pressing process ensures even deformation of the inner steel pipe 6, avoiding the risk of localized stress concentration or pipe wall rupture caused by a single full-length pressing. During the leftward pressing process, the inner wall of the inner steel pipe 6 gradually contracts inward, compressing the flexible inner cylinder 1 into elastic deformation. The spiral grooves 5 on the inner wall of the flexible inner cylinder 1 press tightly against the outer wall of the carbon core, causing the texture of the spiral grooves 5 to interlock with the spiral texture of the outer wall of the carbon core, forming a mechanical locking structure. After completing the leftward pressing, the press... The inner steel pipe 6 is returned to its middle position and pressed from the middle to the right end, with the same pressure applied at each step until it is pressed to the right edge of the inner steel pipe 6. By pressing symmetrically from the middle to both ends, the pressing quality of the inner steel pipe 6 is kept consistent throughout its entire length, and the radial shrinkage is uniform. This prevents the pipe body from becoming eccentric or the carbon core from bending due to improper pressing sequence. The engagement of the spiral groove 5 with the carbon core provides a huge pull-out resistance, preventing the carbon core from slipping out of the splice tube when subjected to conductor tension. The tight wrapping structure formed after the inner steel pipe 6 is pressed can isolate external moisture and corrosive gases from contacting the carbon core, extending the service life of the conductor.

[0026] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5An embodiment of the present invention provides: a stranded carbon fiber composite core conductor with an intermediate overlapping joint tube, wherein an outer aluminum tube 8 is provided on the outer side of the inner steel tube 6, the inner side of the outer aluminum tube 8 is in contact with the outer side of the first conductor 11 and the second conductor 12, the outer aluminum tube 8 is sleeved on the outside of the inner steel tube 6, and the outer aluminum tube 8 is pressed into the outer wall of the first conductor 11 and the second conductor 12 by a press. Furthermore, after the inner steel pipe 6 is crimped and a stable carbon core fixing structure is formed, the operator performs the crimping operation of the outer aluminum pipe 8. First, the outer aluminum pipe 8, which is pre-fitted on the outside of the first conductor 11, is moved axially so that the outer aluminum pipe 8 slides to the outside of the crimped inner steel pipe 6. At this time, the inner wall of the left end of the outer aluminum pipe 8 is in contact with the outer wall of the first conductor 11, and the inner wall of the right end of the outer aluminum pipe 8 is in contact with the outer wall of the second conductor 12, forming a nested structure of inner and outer layers. The length of the outer aluminum pipe 8 covers the entire inner steel pipe 6 and extends to the aluminum stranded wire area of ​​the conductors on both sides to ensure the electrical continuity and mechanical strength of the connection area. The operator then places the crimping die of the press onto the left side of the external aluminum tube 8 and begins crimping the left side. The starting position for crimping is set at the right end where the external aluminum tube 8 contacts the first conductor 11, i.e., the initial boundary where the outer wall of the right end of the first conductor 11 contacts the inner wall of the external aluminum tube 8. The press starts from the initial position and crimps gradually from right to left, applying a fixed radial pressure at each step until it reaches the left edge of the external aluminum tube 8. This gradually expels the air between the external aluminum tube 8 and the first conductor 11, ensuring a tight metal-to-metal contact between the inner wall of the aluminum tube and the outer wall of the conductor, effectively reducing contact resistance. After completing the left side crimping, the press moves to the right side of the external aluminum tube 8 for right side crimping. The starting position is set at the boundary where the outer wall of the left end of the second conductor 12 fits against the inner wall of the outer aluminum tube 8. The press starts from this position and gradually presses from left to right, with the pressing pressure being the same as on the left side at each step, until it is pressed to the right edge of the outer aluminum tube 8, so that the outer aluminum tube 8 is evenly pressed against the outer wall of the first conductor 11 and the second conductor 12. After the pressing is completed, the outer aluminum tube 8 and the aluminum stranded wire layers of the conductors on both sides form an integrated conductive channel. At the same time, the inner steel tube 6 is completely wrapped inside the aluminum tube, which plays a protective role against corrosion and mechanical damage. Meanwhile, the pressing process of the outer aluminum tube 8 will not generate additional stress on the internal carbon core, which improves the reliability and durability of the splice tube in long-term operation.

[0027] Please see Figure 1 , Figure 3 , Figure 6 and Figure 8An embodiment of the present invention provides: a stranded carbon fiber composite core conductor with an intermediate overlapping joint tube, wherein the flexible inner cylinder 1 is interlocked with the outer wall of the carbon core through the spiral groove 5 on the inner wall, the flexible inner cylinder 1 is fixed in the inner steel pipe 6 by the first limiting ring 3 and the second limiting ring 4 on both sides, the inner steel pipe 6 is connected to the flexible inner cylinder 1 through the interlocking of the slot 7 and the locking block 2, and an outer aluminum pipe 8 is provided on the outside of the inner steel pipe 6, the outer aluminum pipe 8 is pressed into the outside of the first conductor 11 and the second conductor 12; Furthermore, the inner steel pipe 6 fixes the carbon core through the internally compressed flexible inner cylinder 1. The spiral groove 5 set on the inner wall of the flexible inner cylinder 1 forms a full-contact fitting with the spiral structure on the outer wall of the carbon core, so that the radial pressure generated by the pressing is evenly distributed on the surface of the carbon core, avoiding the phenomenon of excessive local pressure damaging the carbon fiber monofilaments, thereby effectively maintaining the integrity of the tensile strength of the carbon core. At the same time, the flexible inner cylinder 1 is made of highly elastic and aging-resistant polymer material. When the conductor undergoes slight bending or axial displacement under wind vibration, the flexible inner cylinder 1 can undergo elastic deformation to absorb energy and return to its original shape after the vibration stops, continuously maintaining the clamping force on the carbon core, improving the fatigue life of the splice tube. The flexible inner cylinder 1 has good electrical insulation properties, which can block the electrical path between the carbon core and the inner steel pipe 6, prevent electrochemical corrosion caused by potential difference, and ensure the long-term stability of the carbon fiber composite core in a humid environment. The external aluminum tube 8 is crimped onto the outside of the first conductor 11 and the second conductor 12 for electrical connection and external protection. The inner wall of the external aluminum tube 8 forms a metal contact with the conductor through crimping, and the contact resistance is lower than the national standard limit, ensuring that the current passes through the joint without loss. The two ends of the external aluminum tube 8 are crimped and wrapped around the outside of the first conductor 11 and the second conductor 12 to form a continuous metal barrier, which can prevent rainwater and corrosive media such as industrial dust from penetrating into the inside of the connecting tube along the surface of the conductor, protecting the inner steel tube 6 and the carbon core from chemical corrosion by the external environment. The external aluminum tube 8 also plays a mechanical protection role, preventing the inner steel tube 6 from being bumped or scratched by external forces during transportation, installation or operation. The first rubber pad 9 is disposed between the first limiting ring 3 and the first conductor 11, and the second rubber pad 10 is disposed between the second limiting ring 4 and the second conductor 12. The first rubber pad 9 and the second rubber pad 10 are in a compressed state after crimping. The first rubber pad 9 and the second rubber pad 10 are elastic buffer elements. When the conductor is subjected to axial tension or impact load, they can absorb the impact energy between the limiting ring and the end of the conductor, avoiding hard contact that could cause the aluminum stranded wire of the conductor to loosen or the end of the carbon core to be damaged. At the same time, one end of the first rubber pad 9 and the second rubber pad 10 are tightly attached to the outer wall of the conductor, and the other end of the first rubber pad 9 and the second rubber pad 10 are tightly attached to the side of the limiting ring to form a radial sealing ring. When the end seal of the external aluminum tube 8 fails due to aging, the first rubber pad 9 and the second rubber pad 10 can prevent moisture from seeping into the carbon core area along the axial direction of the conductor. Under the action of the crimping force, the first rubber pad 9 and the second rubber pad 10 will generate a rebound force. The rebound force continues to act between the limiting ring and the conductor, increasing the pre-tightening force of the overall structure of the splice tube to resist the loosening tendency that may occur during long-term operation. Moreover, the elastic modulus of the first rubber pad 9 and the second rubber pad 10 is lower than that of metal materials. When the conductor expands and contracts due to temperature changes, the rubber pad can absorb the dimensional change through its own compression and rebound deformation, avoiding excessive thermal stress in the carbon core or aluminum stranded wire. This allows the splice tube with the middle overlap of the stranded carbon fiber composite core conductor to maintain a stable and reliable working state in harsh environments such as strong winds, icing, alternating high and low temperatures, and high humidity.

[0028] Working principle: During connection, the operator disassembles the aluminum stranded wire layers at the ends of the first conductor 11 and the second conductor 12, and spirally winds the first stranded wire 13, the second stranded wire 14 and the third stranded wire 15 inside the conductor in a counterclockwise direction to form a carbon core. The operator then puts the inner steel pipe 6 on the outside of the flexible inner cylinder 1, so that the groove 7 on the inner wall of the inner steel pipe 6 is engaged with the block 2 of the flexible inner cylinder 1 to prevent relative rotation and axial sliding. The first limiting ring 3 and the second limiting ring 4 are fixed at both ends of the inner steel pipe 6. Then, the outer aluminum pipe 8, the assembled inner steel pipe 6 and the first rubber pad 9 are put on the outside of the carbon core of the first conductor 11. Finally, the second rubber pad 10 is put on the outside of the carbon core of the second conductor 12. Then the operator aligns the ends of the two carbon cores, interlacing the fiber bundles and screwing them together clockwise to form a self-locking connection to prevent axial slippage. Then the spiral grooves 5 on the inner wall of the flexible inner cylinder 1 are interlocked with the spiral patterns on the outer wall of the carbon core. The flexible inner cylinder 1 is elastically deformed by a hydraulic press from the middle of the inner steel pipe 6 to both ends, and the spiral grooves 5 are pressed tightly against the outer wall of the carbon core to form a mechanical locking structure, providing resistance to pull-out. Finally, the external aluminum tube 8 is moved to the outside of the internal steel tube 6 so that the external aluminum tube 8 covers the aluminum stranded layer of the first conductor 11 and the second conductor 12. The inner wall of the external aluminum tube 8 and the outer wall of the conductor are made into tight metal contact by the press to ensure electrical continuity. The first rubber pad 9 and the second rubber pad 10 are in a compressed state after crimping, which is used for buffering energy absorption, radial sealing and thermal expansion and contraction compensation, to ensure the long-term stable operation of the splice in harsh environments.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A stranded carbon fiber composite core conductor with an intermediate overlapping joint, comprising a flexible inner cylinder (1), an inner steel pipe (6), and an outer aluminum pipe (8), characterized in that: The flexible inner cylinder (1) is fitted with the outer wall of the carbon core through the spiral groove (5) on the inner wall. The carbon core is formed by winding the first stranded wire (13), the second stranded wire (14) and the third stranded wire (15). The flexible inner cylinder (1) is fixed in the inner steel pipe (6) by the first limiting ring (3) and the second limiting ring (4) on both sides. The first limiting ring (3) is connected to the first conductor (11) through the first rubber pad (9). The second limiting ring (4) is connected to the second conductor (12) through the second rubber pad (10). The inner steel pipe (6) is connected to the flexible inner cylinder (1) through the fitting of the slot (7) and the block (2). An outer aluminum pipe (8) is provided on the outside of the inner steel pipe (6). The outer aluminum pipe (8) is pressed against the outside of the first conductor (11) and the second conductor (12).

2. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 1, characterized in that: The inner wall of the flexible inner cylinder (1) is provided with a spiral groove (5). The inner wall of the spiral groove (5) is interlocked with the outer wall of the carbon core. The carbon core includes a first stranded wire (13), a second stranded wire (14) and a third stranded wire (15). The first stranded wire (13), the second stranded wire (14) and the third stranded wire (15) are spirally wound counterclockwise to form the carbon core.

3. The stranded carbon fiber composite core conductor with intermediate overlap splice type splicing tube according to claim 2, characterized in that: The flexible inner cylinder (1) has a first limiting ring (3) at the front end of its outer wall and a second limiting ring (4) at the rear end of its outer wall. The side of the outer wall of the first limiting ring (3) is in contact with the first rubber pad (9), and the side of the outer wall of the second limiting ring (4) is in contact with the second rubber pad (10).

4. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 3, characterized in that: The first rubber pad (9) is fitted on the outside of the carbon core. The outer side of the first rubber pad (9) is in contact with the first wire (11). The first rubber pad (9) is positioned between the first limiting ring (3) and the first wire (11).

5. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 4, characterized in that: The carbon core is also covered with a second rubber pad (10). The outer side of the second rubber pad (10) is in contact with the second wire (12). The second rubber pad (10) is located between the second limiting ring (4) and the second wire (12).

6. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 5, characterized in that: An inner steel pipe (6) is provided between the second limiting ring (4) and the first limiting ring (3). The front end of the outer wall of the inner steel pipe (6) is in contact with the first limiting ring (3), and the rear end of the outer wall of the inner steel pipe (6) is in contact with the second limiting ring (4).

7. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 6, characterized in that: The inner wall of the inner steel pipe (6) is provided with a groove (7). The groove (7) extends from the front end of the inner wall of the inner steel pipe (6) to the rear end of the inner wall. The inner wall of the groove (7) and the outer wall of the block (2) are interlocked. The block (2) is provided on the outer wall of the flexible inner cylinder (1).

8. The stranded carbon fiber composite core conductor with intermediate lap joint type splicing tube according to claim 7, characterized in that: The inner steel pipe (6) is sleeved on the outside of the flexible inner cylinder (1). The inner steel pipe (6) is pressed onto the outer wall of the flexible inner cylinder (1) by a press machine. The inner steel pipe (6) presses the flexible inner cylinder (1) onto the outer wall of the carbon core.

9. A stranded carbon fiber composite core conductor with an intermediate lap joint type splicing tube according to claim 8, characterized in that: An external aluminum tube (8) is provided on the outer side of the inner steel tube (6), and the inner side of the external aluminum tube (8) is in contact with the outer side of the first conductor (11) and the second conductor (12).

10. A stranded carbon fiber composite core conductor with an intermediate lap joint type splicing tube according to claim 9, characterized in that: The external aluminum tube (8) is sleeved on the outside of the internal steel tube (6), and the external aluminum tube (8) is pressed into the outer wall of the first conductor (11) and the second conductor (12) by a press.

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