A high-performance aluminum-clad steel core composite heat-resistant stranded cable

Abstract

The application relates to a high-performance aluminum-clad steel-core composite heat-resistant stranded cable, and belongs to the technical field of aluminum-clad steel-core composite heat-resistant stranded cables.The aluminum-clad steel-core composite heat-resistant stranded cable comprises a wire main body, the wire main body comprises a hollow supporting core pipe and a reinforcing stranded wire layer sleeved on the surface of the hollow supporting core pipe, two layers of conductive aluminum wire layers are wound on the surface of the reinforcing stranded wire layer, check valve bodies are equidistantly arranged in the hollow supporting core pipe, the check valve bodies are made of carbon fiber reinforced polymers, the hollow supporting core pipe is filled with helium, a supporting spiral pipe is fixedly installed on the surface of the wire main body, and compensation assemblies are arranged at the two ends of the wire main body.The application distributes the force generated by sag on the main body, reduces the structural quality while increasing the overall tensile strength, effectively reduces the fatigue micro-crack problem caused by the sag problem to the whole device, ensures the uniform distribution of the current on the outer layer of the device, and avoids the increase of line loss.

Description

Technical Field

[0001] This invention relates to the field of aluminum-clad Invar core composite heat-resistant stranded cable technology, specifically a high-performance aluminum-clad Invar core composite heat-resistant stranded cable. Background Technology

[0002] Aluminum-clad Invar core heat-resistant aluminum alloy stranded cable is a high-performance conductor mainly used in high-voltage overhead transmission lines. It achieves stable operation at high temperatures and significantly improves power transmission capacity by using a special "Invar" material in the core load-bearing part of the conductor and combining it with an outer heat-resistant aluminum alloy.

[0003] During the installation of aluminum-clad Invar steel core heat-resistant aluminum alloy stranded cables, sag will occur due to the overall span. However, sag will be subjected to dynamic loads such as wind vibration and galloping. Over time, fatigue microcracks are likely to occur on the surface of the outer strands of the cable, especially at the crimping points of the suspension points. Cracks in the outer layer of the cable will disrupt the uniform distribution of current on the cable, leading to increased line loss.

[0004] To avoid the above problems, we propose a high-performance aluminum-clad Invar core composite heat-resistant stranded cable. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-performance aluminum-clad Invar core composite heat-resistant stranded cable, which solves the problem that traditional devices are prone to fatigue microcracks under dynamic loads such as wind vibration and galloping during use, ensuring uniform current distribution on the outer layer of the device and avoiding increased line loss.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-performance aluminum-clad Invar core composite heat-resistant stranded cable, comprising a conductor body, wherein the conductor body comprises a hollow support core tube and a reinforcing stranded wire layer sleeved on the surface of the hollow support core tube, and the surface of the reinforcing stranded wire layer is wound with two layers of conductive aluminum wire. The hollow support core tube is equipped with check valve bodies at equal intervals inside, and the check valve bodies are made of carbon fiber reinforced polymer. The hollow support core tube is filled with helium gas. The surface of the conductor body is fixedly installed with a support spiral tube, and the two ends of the conductor body are provided with compensation components.

[0007] Furthermore, the hollow support core tube is made of modified polytetrafluoroethylene (PTFE), and glass fiber is added inside the modified PTFE material. The modified PTFE material and glass fiber are mixed by physical blending and the final shape is achieved by extrusion molding.

[0008] Furthermore, both conductive aluminum wire layers are made by stranding several galvanized aluminum wires concentrically.

[0009] Furthermore, the reinforced stranded wire layer is made of several Invar core wires stranded concentrically.

[0010] Furthermore, the supporting spiral tube is made of carbon fiber reinforced polymer, and the spiral angle of the supporting spiral tube is 30°-45°. The surface of the supporting spiral tube is fixed to the surface of the conductor body with modified epoxy resin.

[0011] Furthermore, the compensation component includes double-groove rollers rotatably mounted on the upper sides of the front and rear sides of the inner wall of the conversion shell, and embedded grooves are provided on both the front and rear sides of the inner wall of the conversion shell. An adjustment component is provided on the upper side of the inner wall of the embedded groove, and a moving block is slidably mounted on the lower side of the inner wall of the embedded groove. A single-groove roller is rotatably mounted on the opposite sides of the two moving blocks.

[0012] Furthermore, the adjustment assembly includes a first trapezoidal block slidably mounted on the upper side of the inner wall of the embedded groove, and a second trapezoidal block slidably mounted on the top surface of the first trapezoidal block. A push plate is fixedly mounted on one side of the surface of the second trapezoidal block. Push hole plates are fixedly mounted on opposite sides of the two corresponding push plates. An adjusting threaded rod is threadedly connected to the inner wall of the push hole plate. Cable outlets are opened on both the left and right sides of the inner wall of the conversion shell. Reinforcing hole plates are fixedly mounted on both the front and rear sides of the conversion shell. Long shaft screws are provided on the inner walls of the two front and rear reinforcing hole plates. Several damping springs are fixedly mounted on the bottom surface of the second trapezoidal block.

[0013] Furthermore, the embedded groove is an independent opening, and the top of the embedded groove is an embedded independent slot hole. The two grooves of the double-groove roller and the single groove of the single-groove roller are both semi-circular grooves, and the diameter of the semi-circular groove is the same as the diameter of the wire body. The inner wall of the single-groove roller is located directly below the two inner walls of the double-groove roller.

[0014] Furthermore, the surfaces of the first trapezoidal block and the second trapezoidal block are tightly fitted to the upper side of the inner wall of the corresponding embedded groove, while the surface of the push plate extends through to the surface of the conversion shell, one end of the adjusting threaded rod is rotatably connected to the surface of the conversion shell, and the extension and retraction ends of the plurality of damping springs are fixedly connected to the top surface of the moving block.

[0015] Furthermore, the two outlets are staggered vertically, and the outlets are located on one side of the inner wall of the double-groove roller.

[0016] Compared with the prior art, the present invention provides a high-performance aluminum-clad Invar core composite heat-resistant stranded cable, which has the following advantages: 1. This device distributes the force generated by sag on its main body, and while increasing the overall tensile strength, it reduces the structural mass, thereby effectively reducing the fatigue microcrack problem caused by sag on the overall device, ensuring the uniform distribution of the outer current of the device, and avoiding increased line loss.

[0017] 2. In this device, the modified polytetrafluoroethylene material and glass fiber are mixed by physical blending. The physical mixing is thorough and uniform, which facilitates the subsequent extrusion molding. The extrusion molding of the hollow support core tube involves pushing the mixed material out of the annular gap between the mandrel and the mold sleeve to form a tube, thus ensuring the normal use effect of the core tube structure.

[0018] 3. This device utilizes the rotation of the adjusting threaded rod to drive the second trapezoidal block and the first trapezoidal block on the push plate to generate a squeezing displacement, thereby adjusting the initial thrust of the damping spring and ensuring the stress relief quality of the entire device. Attached Figure Description

[0019] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a perspective view of the main body of the conductor of the present invention; Figure 3 This is a vertical sectional perspective view of the main body of the conductor of the present invention; Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 This is a side view of the main body of the conductor of the present invention; Figure 6 This is a perspective view of the compensation component of the present invention. Figure 7 This is a three-dimensional cross-sectional view of the embedded groove of the present invention; Figure 8 for Figure 7 Enlarged structural diagram of section B in the middle; Figure 9 This is a top view of the cross-section of the conversion shell of the present invention; Figure 10 This is a perspective view of the combination of the compensation component and the adjustment component of the present invention; Figure 11 This is a vertical sectional perspective view of the conversion shell of the present invention.

[0020] In the diagram: 1. Main conductor; 2. Hollow support core tube; 3. Reinforced stranded wire layer; 4. Conductive aluminum wire layer; 5. Check valve body; 6. Supporting spiral tube; 7. Compensation component; 701. Conversion shell; 702. Double-groove roller; 703. Embedded groove; 704. Moving block; 705. Single-groove roller; 8. Adjustment component; 801. First trapezoidal block; 802. Second trapezoidal block; 803. Push plate; 804. Pushing hole plate; 805. Adjusting threaded rod; 806. Outlet; 807. Reinforced hole plate; 808. Long shaft screw; 809. Damping spring. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1 to 11 This embodiment describes a high-performance aluminum-clad Invar core composite heat-resistant stranded cable, comprising a conductor body 1. The conductor body 1 includes a hollow support core tube 2 and a reinforcing stranded layer 3 sleeved on the surface of the hollow support core tube 2. The reinforcing stranded layer 3 is made of several Invar core wires stranded concentrically. The hollow support core tube 2 is made of modified polytetrafluoroethylene (PTFE), with glass fiber incorporated inside. The modified PTFE and glass fiber are physically blended and then formed using a compression molding method to achieve the desired effect. In the final molding process, the modified polytetrafluoroethylene material and glass fiber are mixed by physical blending. The physical mixing is thorough and uniform, which facilitates the subsequent extrusion molding. The extrusion molding of the hollow support core tube 2 involves pushing the mixed material out from the annular gap between the mandrel and the mold sleeve to form a tube shape, ensuring the normal use effect of the core tube structure. The surface of the reinforcing stranded wire layer 3 is wrapped with two layers of conductive aluminum wire 4. Both layers of conductive aluminum wire 4 are made of several galvanized aluminum wires twisted together in a concentric manner. The glass fiber content of this application is recommended to be 15%-25%, which can significantly improve mechanical strength without affecting the extrusion molding process. Check valve bodies 5 are equidistantly arranged inside the hollow support core tube 2, and the check valve bodies 5 are made of carbon fiber reinforced polymer. The hollow support core tube 2 is filled with helium. A support spiral tube 6 is fixedly installed on the surface of the conductor body 1. The support spiral tube 6 is made of carbon fiber reinforced polymer, and the spiral angle of the support spiral tube 6 is 30°-45°. The surface of the support spiral tube 6 is fixed to the surface of the conductor body 1 with modified epoxy resin. Compensation components 7 are provided at both ends of the conductor body 1. Comparing the axial and radial components of the supporting spiral tube 6 at helix angles of 30°, 37.5°, and 45°, the following table is obtained: helix angle Axial component force (counteracting sag) Radial component force (gripping the cable) 30° The extremely strong (optimal) axial force component accounts for approximately 86.6%. The weaker radial component accounts for approximately 50%. 37.5° A very strong axial force accounts for approximately 78.5%. The moderate radial component accounts for approximately 62.3%. 45° The strong axial component accounts for approximately 70.7%. The strong radial component accounts for approximately 70.7%. As can be seen from the table above, the helix angle of the supporting spiral tube 6 is in the range of 30°-45°. 37.5° is the optimal angle to solve the sag problem and take into account the long-term reliability of the system. It ensures that the supporting spiral tube 6 can efficiently share the downward stress and form a solid whole with the conductor body 1.

[0023] The check valve body 5 of this application can adopt a "duckbill type check valve" or an "umbrella-shaped diaphragm valve" to ensure that when the conductor body 1 is partially damaged, gas leakage is limited to the section between two adjacent check valve bodies 5, maintaining the overall buoyancy and support performance of the conductor body 1. By turning the adjusting threaded rod 805, the initial position of the second trapezoidal block 802 can be set, thereby providing a precise pre-compression amount for the damping spring 809. The supporting spiral tube 6 of this application uniformizes the concentrated sag force along the length of the cable; while the compensation component 7 is a "active absorption and buffering" dynamic variable. The combination of the two constitutes a comprehensive stress management from "static" to "dynamic".

[0024] The compensation component 7 includes double-groove rollers 702 rotatably mounted on the upper sides of the front and rear sides of the inner wall of the conversion housing 701. The front and rear sides of the inner wall of the conversion housing 701 are provided with embedded grooves 703. An adjustment component 8 is provided on the upper side of the inner wall of the embedded groove 703. The adjustment component 8 includes a first trapezoidal block 801 slidably mounted on the upper side of the inner wall of the embedded groove 703, and a second trapezoidal block 802 slidably mounted on the top surface of the first trapezoidal block 801. A push plate 803 is fixedly mounted on one side of the surface of the second trapezoidal block 802. A push hole plate 804 is fixedly mounted on the opposite sides of the two corresponding push plates 803. An adjustment threaded rod 805 is threadedly connected to the inner wall of the push hole plate 804. The adjustment threaded rod 805 is used to adjust the rod. The rotation of rod 805 can cause the second trapezoidal block 802 and the first trapezoidal block 801 on the push plate 803 to produce a squeezing displacement, thereby adjusting the initial thrust of the damping spring 809, thus ensuring the stress relief quality of the overall device. The inner wall of the conversion shell 701 has cable outlets 806 on both the left and right sides, and the front and rear sides of the conversion shell 701 are fixedly installed with reinforcing hole plates 807. The inner walls of the two front and rear reinforcing hole plates 807 are jointly provided with long shaft screws 808. Several damping springs 809 are fixedly installed on the bottom surface of the second trapezoidal block 802. The lower side of the inner wall of the embedded groove 703 is slidably installed with a moving block 704, and the two opposite sides of the moving blocks 704 are rotatably installed with single groove rollers 705. The embedded groove 703 has an independent opening, and the top of the embedded groove 703 is an embedded independent slot hole. The two grooves of the double groove roller 702 and the single groove of the single groove roller 705 are all semi-circular grooves, and the diameter of the semi-circular groove is the same as the diameter of the wire body 1. The inner wall of the single groove roller 705 is located directly below the two inner walls of the double groove roller 702. The surfaces of the first trapezoidal block 801 and the second trapezoidal block 802 are tightly fitted to the upper side of the inner wall of the corresponding embedded groove 703. The surface of the push plate 803 extends through to the surface of the conversion shell 701. One end of the adjusting threaded rod 805 is rotatably connected to the surface of the conversion shell 701. The extension and retraction ends of several damping springs 809 are fixedly connected to the top surface of the moving block 704. The two outlets 806 are staggered vertically, and the outlets 806 are located on one side of the inner wall of the double groove roller 702.

[0025] The working principle of the above embodiments is as follows: When the device is in use, the low-density gas filled in the hollow support core tube 2 can offset the weight of the hollow support core tube 2 and the check valve body 5. Furthermore, the toughness of the hollow support core tube 2 during installation can generate an upward reaction force in the middle of the conductor body 1. Because the deformation of the hollow support core tube 2 without the weight of the conductor body 1 is different from the deformation with the weight of the conductor body 1, the toughness support of the hollow support core tube 2 can increase the toughness support effect of the conductor body 1, thereby reducing the sag problem of the conductor body 1. This ensures that the tensile strength in the middle of the conductor body 1 is low during use, thus avoiding the problem of fatigue microcracks easily generated at the suspension point crimping of the conductor body 1. It also prevents cracks from forming on the outer layer of the conductor body 1, which would disrupt the uniform distribution of current on it, and ensures the normal function of the conductor body 1. Furthermore, when the conductor body 1 is cut during use, it will be blocked by the check valve body 5, which will not affect the internal air content of the hollow support core tube 2. At the cut end, silicone is used to seal it to ensure that the internal gas will not be lost. If it is necessary to add gas, the inflation tube can be pulled out when the required air pressure is reached. The self-filling property of silicone can be used to seal the inflation hole and ensure that the gas does not leak. In addition, the setting of the central hollow support core tube 2 will increase the conductive area of ​​the conductive aluminum wire layer 4. Because the area of ​​winding is increased, it is increased from one core to one tube. Although the increased cross-section is not too large, the cumulative length will increase the conductive area of ​​the conductive aluminum wire layer 4, thereby reducing the conductive resistance and reducing the loss of conductivity. During use, the support spiral tube 6 can evenly transmit the downward stress generated in the middle of the conductor body 1. The spiral fixing effect of the support spiral tube 6 ensures a rigid connection with the surface of the conductor body 1. Thus, the sag force caused by the weight of the conductor body 1 is distributed to each segment of the conductor body 1 by the support spiral tube 6, thereby sharing the stress in the middle of the conductor body 1. Furthermore, in conjunction with the compensation component 7, it can actively counteract the tension caused by the sag, making the axial force on the conductor body 1 more stable. Because the conductor body 1 is surrounded by the double-groove roller 702 and the single-groove roller 705, when tension is generated in the conductor body 1, the damping spring 809 absorbs and counteracts the additional tension caused by sag and thermal expansion and contraction through elastic deformation, preventing the tension from concentrating on the conductor body 1 or the suspension point, thus increasing the cable's performance.

[0026] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable, comprising a conductor body (1), characterized in that: The conductor body (1) includes a hollow support core tube (2) and a reinforcing stranded wire layer (3) sleeved on the surface of the hollow support core tube (2), and two layers of conductive aluminum wire (4) are wound on the surface of the reinforcing stranded wire layer (3). The hollow support core tube (2) is provided with check valve bodies (5) at equal intervals inside, and the check valve bodies (5) are made of carbon fiber reinforced polymer. The hollow support core tube (2) is filled with helium. The surface of the conductor body (1) is fixedly installed with a support spiral tube (6). The two ends of the conductor body (1) are provided with compensation components (7). The compensation components (7) include double groove rollers (702) rotatably installed on the upper sides of the inner wall of the conversion shell (701). The inner walls of the conversion shell (701) are provided with embedded grooves (703) on both the front and rear sides. The upper side of the inner wall of the embedded groove (703) is provided with an adjustment component (8). The lower side of the inner wall of the embedded groove (703) is slidably installed with a moving block (704). The two moving blocks (704) are rotatably installed with single groove rollers (705) on their opposite sides.

2. The high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: The hollow support core tube (2) is made of modified polytetrafluoroethylene, and glass fiber is added inside the modified polytetrafluoroethylene material. The modified polytetrafluoroethylene material and glass fiber are mixed by physical blending and the final molding is achieved by extrusion molding.

3. The high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: Both conductive aluminum wire layers (4) are made by twisting several galvanized aluminum wires together in a concentric manner.

4. The high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: The reinforced stranded wire layer (3) is made of several Invar core wires stranded together in a concentric stranding manner.

5. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: The supporting spiral tube (6) is made of carbon fiber reinforced polymer, and the spiral angle of the supporting spiral tube (6) is 30°-45°. The surface of the supporting spiral tube (6) is fixed to the surface of the conductor body (1) with modified epoxy resin.

6. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: The adjustment assembly (8) includes a first trapezoidal block (801) slidably mounted on the upper side of the inner wall of the embedded groove (703), and a second trapezoidal block (802) slidably mounted on the top surface of the first trapezoidal block (801). A push plate (803) is fixedly mounted on one side of the surface of the second trapezoidal block (802). A push hole plate (804) is fixedly mounted on the opposite sides of the two corresponding push plates (803). An adjustment threaded rod (805) is threadedly connected to the inner wall of the push hole plate (804). Cable outlets (806) are opened on both the left and right sides of the inner wall of the conversion shell (701). Reinforcing hole plates (807) are fixedly mounted on both the front and rear sides of the conversion shell (701). A long shaft screw (808) is provided on the inner wall of the two front and rear reinforcing hole plates (807). Several damping springs (809) are fixedly mounted on the bottom surface of the second trapezoidal block (802).

7. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 1, characterized in that: The embedded groove (703) is an independent opening, and the top of the embedded groove (703) is an embedded independent slot hole. The two slots of the double-groove roller (702) and the single-groove roller (705) are all semi-circular grooves, and the diameter of the semi-circular groove is the same as the diameter of the wire body (1). The inner wall of the single-groove roller (705) is located directly below the two inner walls of the double-groove roller (702).

8. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 6, characterized in that: The surfaces of the first trapezoidal block (801) and the second trapezoidal block (802) are tightly fitted to the upper side of the inner wall of the corresponding inner groove (703), while the surface of the push plate (803) extends through to the surface of the conversion shell (701), one end of the adjusting threaded rod (805) is rotatably connected to the surface of the conversion shell (701), and the extension ends of the damping springs (809) are fixedly connected to the top surface of the moving block (704).

9. A high-performance aluminum-clad Invar core composite heat-resistant stranded cable according to claim 6, characterized in that: The two outlets (806) are staggered vertically, and the outlets (806) are located on one side of the inner wall of the double-groove roller (702).

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