An aluminum alloy core power cable

Abstract

This invention relates to the field of power cable technology, specifically disclosing an aluminum alloy core power cable, comprising a cable core and an inner sheath, a wrapping layer, a shielding layer, and an outer sheath sequentially wrapped around the cable core. The cable core includes a central skeleton arranged along the central longitudinal axis and multiple conductors, and further includes: a cooling layer, a support, a cooling plug, and an elastic element. The cooling layer has an inlet pipe at one end and an outlet pipe at the other end, connecting the wrapping layer, shielding layer, and outer sheath. A water valve is fixed at the outlet pipe opening. The cooling layer is connected to a liquid outlet pipe, which in turn connects the wrapping layer, shielding layer, and outer sheath. The outlet pipe has a funnel-shaped outlet, and a cooling plug that mates with the outlet is provided at the outlet. The invention also includes an elastic element that, in its initial state, allows the cooling plug to fit tightly against the outlet pipe. One end of the elastic element is fixedly connected to the end of the cooling plug, and the other end is fixed to the support, which is fixed to the wall of the connecting pipe. Compared with traditional solutions, this solution achieves continuous cooling of the cable.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to an aluminum alloy core power cable. Background Technology

[0002] Cables are typically rope-like structures made of several or groups of conductors (at least two conductors per group) twisted together. Each group of conductors is insulated from the others and is often twisted around a central conductor, with the entire structure covered by a highly insulating outer layer. Cables are characterized by internal conductivity and external insulation. Types of cables include power cables, control cables, compensating cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and so on. They are all composed of single or multiple strands of conductors and an insulation layer, used to connect circuits and electrical appliances. While high-temperature cables on the market have good heat resistance, most have poor heat dissipation, making them prone to prolonged exposure to high temperatures, which can affect their conductivity. Therefore, a type of cable capable of withstanding high-temperature environments for extended periods is needed.

[0003] As disclosed in Chinese Patent Publication No. CN113823446A, this invention relates to the field of charging cables, specifically a water-cooled cable, comprising a liquid-cooled inlet pipe and two liquid-cooled main conductors. Each liquid-cooled main conductor, from the inside out, includes a liquid-cooled outlet pipe, an insulating layer, a conductor layer, and a main conductor insulation layer, which are sequentially and coaxially arranged, layer by layer. The insulating layer between the liquid-cooled outlet pipe and the conductor layer effectively prevents condensation caused by large temperature changes in the liquid-cooled pipe, which could lead to oxidation or short circuits in the conductor layer, and improves the overall heat dissipation performance, reliability, and stability of the cable.

[0004] This patented technology improves cable heat dissipation by using a liquid-cooled inlet pipe, enhancing its ability to withstand high temperatures. The insulating layer between the liquid-cooled outlet pipe and the conductor layer effectively prevents condensation caused by large temperature fluctuations in the liquid-cooled pipe, which could lead to oxidation or short circuits in the conductor layer. However, this solution has some problems in practical applications: the high temperature of the conductor core causes the liquid inside the liquid-cooled pipe to evaporate into gas, and the expansion of the gas inside the pipe can put pressure on the pipe wall. After liquid loss, the liquid-cooled pipe can no longer continuously cool the cable. Therefore, we need a device that continuously removes heat from the cable for uninterrupted cooling. Summary of the Invention

[0005] This invention provides an aluminum alloy core power cable. To solve the problem of the inability to continuously dissipate heat from the cable and achieve uninterrupted cooling, this application provides the following technical solution:

[0006] An aluminum alloy core power cable includes a cable core and an inner sheath, a wrapping layer, a shielding layer, and an outer sheath sequentially wrapped around the cable core. The cable core includes a central skeleton arranged along the central longitudinal axis and multiple conductors. It also includes a cooling layer, a support, a cooling plug, and an elastic element. The cooling layer is fixed between the inner sheath and the wrapping layer, and the cooling layer contains a sealed cavity. One end of the cooling layer has a water inlet pipe, and the other end has a water outlet pipe. Both the water inlet and outlet pipes sequentially pass through the wrapping layer, the shielding layer, and the outer sheath and connect to the cavity. A water valve is fixed at the outlet of the water outlet pipe. Several liquid outlet pipes are connected to the cooling layer, sequentially passing through the wrapping layer, the shielding layer, and the outer sheath and connecting to the cavity within the cooling layer. The outlet of the liquid outlet pipe is funnel-shaped, and a cooling plug is fixed at the outlet. The cable also includes an elastic element that allows the cooling plug to tightly fit the outlet of the liquid outlet pipe in the initial state. One end of the elastic element is fixedly connected to the end of the cooling plug, and the other end of the elastic element is fixed to the support. The support is fixed to the wall of the connecting pipe.

[0007] It also includes a controller and a temperature sensor. The temperature sensor is fixed on the outside of the wire and is connected in series with the controller and the water valve in the same circuit. The temperature sensor is used to transmit a signal to the controller when a high temperature is detected. The controller is used to close the water valve in the outlet pipe when it receives the high temperature signal.

[0008] The basic principles and beneficial effects of the scheme are as follows:

[0009] Because the cooling layer is fixed between the inner sheath and the wrapping layer, and the cooling layer is a closed cavity, with a water inlet pipe at one end and a water outlet pipe at the other end, when water is added to the water inlet pipe, the water will continuously flow through the cavity of the cooling layer, absorbing the heat of the aluminum alloy wire core inside the inner sheath, reducing the temperature of the cable, and achieving a good cooling effect. Because a water valve is fixed at the outlet pipe, and a liquid outlet pipe is connected to the cooling layer, the liquid outlet pipe connects the wrapping layer, the shielding layer, and the outer sheath. The outlet of the liquid outlet pipe is funnel-shaped, and a cooling plug is fixed at the outlet. It also includes an elastic element that, in its initial state, allows the cooling plug to fit tightly against the outlet of the liquid outlet pipe. One end of the elastic element is fixedly connected to the end of the cooling plug, and the other end is fixed to a bracket, which is fixed to the wall of the connecting pipe. Therefore, after the water valve on the outlet pipe is closed, a large amount of water continuously entering the cooling layer flows from the outlet pipe. The increasing water pressure pushes the cooling plug at the outlet pipe opening outwards. After the cooling plug opens, the water in the cooling layer splashes onto the outside of the cable. The water evaporates and absorbs heat, which then carries away the heat from the cable again, resulting in a better cooling effect. After the water valve is opened, the water pressure in the cavity gradually returns to normal. The elastic element, which initially allows the cooling plug to fit tightly against the outlet of the liquid outlet pipe, will spring back, causing the cooling plug to block the outlet again.

[0010] Because the temperature sensor fixed to the outside of the wire is connected in series with the controller and the water valve switch in the same circuit, the temperature sensor transmits a signal to the controller when a high temperature is detected. The controller then closes the water valve in the outlet pipe upon receiving the high temperature signal. Since the temperature sensor uses a metal resistance temperature detector (RTD), the resistance increases in the positive direction. As the temperature rises, the resistance increases, thus transmitting a signal to the controller. Therefore, upon receiving the high temperature signal, the controller sends a command to the water valve, which then closes.

[0011] This solution achieves continuous heat removal from the cable and uninterrupted cooling through the design of the cooling layer.

[0012] Furthermore, it also includes elastic anti-torsion components arranged along the central longitudinal axis. Each anti-torsion component has a hollow receiving cavity filled with a liquid containing pigment. The anti-torsion component is fixed on both sides of the inner wall surface of the inner sheath and the outer surface of the central skeleton, respectively. Multiple buffer portions communicating with the receiving cavity are provided on the outer edge of the anti-torsion component. Each buffer portion has a cavity and is in close contact with the outer side of the wire. The outer diameter ends of the wire abut against the central skeleton and the inner sheath, respectively. The anti-torsion component is attached to the surface of the inner sheath side. The anti-torsion component is connected to a connecting pipe. The connecting pipe sequentially connects the inner sheath, the wrapping layer, the shielding layer, and the outer sheath. The outlet of the connecting pipe is funnel-shaped. It also includes a plug and a spring that allows the plug to fit tightly against the outlet of the connecting pipe in the initial state. One end of the spring is fixed to the end of the plug, and the other end of the spring is fixed to a stabilizing frame. The stabilizing frame is fixed to the wall of the connecting pipe.

[0013] Beneficial effects: The elasticity of the anti-torsion component allows it to deform under the torsional force of the conductor, squeezing the internal liquid into the cavity of the buffer section. The cavity expands as a large amount of liquid flows in, providing cushioning and rebound force for the tortuous conductor, thus improving the cable's anti-torsion ability. The liquid in the cavity also provides heat dissipation for the conductor. In the event of a cable fire, if the anti-torsion component is burned and breaks, the liquid in the cavity will flow out, which will have a fire-extinguishing effect. When the anti-torsion component is subjected to excessive torsional force from the conductor, the deformation caused by the internal compression will cause the liquid in the cavity of the anti-torsion component to exert great pressure on the plug at the opening of the connecting pipe. This will cause the elastic element fixed to the plug to stretch continuously until the colored liquid in the pipe bursts out of the connecting pipe and sprays onto the outside of the cable, thereby achieving the purpose of warning the user.

[0014] Furthermore, it also includes a water filling channel fixed between the cooling layer and the anti-torsion component, and the water filling channel is equipped with a valve.

[0015] Beneficial effect: It allows the fluid inside the anti-torsion component to be filled according to the user's actual needs.

[0016] Furthermore, the wrapping layer is made of polyvinyl fluoride.

[0017] Beneficial effects: Polyvinyl fluoride has good heat resistance, wear resistance, and chemical resistance, and its impact strength and electrical insulation properties are also very good.

[0018] Furthermore, the outer sheath is made of polyurethane material.

[0019] Beneficial effect: Increases the corrosion resistance of cables.

[0020] Furthermore, the conductor includes an aluminum alloy core and an outer insulation layer and a waterproof layer.

[0021] Beneficial effects: The aluminum alloy wire core is lighter, more corrosion-resistant, and cheaper. The insulation and waterproof layers prevent the extreme situation of leakage from the anti-torsion components from corroding the wire. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure when the anti-torsion component is attached to the waterproof layer of the conductor and the central skeleton in this invention;

[0024] Figure 3 This is a cross-sectional view of one side of the wall of the liquid outlet pipe in this invention. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] The markings in the accompanying drawings include: central frame 1, positioning ball 2, buffer part 3, waterproof layer 4, insulation layer 5, water inlet pipe 6, liquid outlet pipe 7, cooling plug 8, elastic element 9, bracket 10, inner sheath 11, cooling layer 12, wrapping layer 13, shielding layer 14, outer sheath 15, water valve 16, water outlet pipe 17, plug 18, spring 19, stabilizing frame 20, connecting pipe 21, aluminum alloy wire core 22.

[0027] Implementation, for example Figure 1 , Figure 2 and Figure 3 As shown:

[0028] This embodiment is an aluminum alloy core power cable, including a cable core and an inner sheath 11, a wrapping layer 13, a shielding layer 14, and an outer sheath 15 sequentially wrapped around the cable core. The cable core includes a central skeleton 1 arranged along the central longitudinal axis and multiple conductors, and also includes a cooling layer 12, a support 10, and an elastic element 9. The cooling layer 12 is fixed between the inner sheath 11 and the wrapping layer 13. The cooling layer 12 has a cavity, with a water inlet pipe 6 at the upper end and a water outlet pipe 17 at the lower end. When water is added to the water inlet pipe 6, water will continuously flow through the cavity in the cooling layer, absorbing the heat of the aluminum alloy core 22 inside the inner sheath 11, reducing the temperature of the cable, and achieving a good cooling effect. A water valve 16 is fixed at the outlet pipe 17. A liquid outlet pipe 7 is connected to the cooling layer 12. The liquid outlet pipe 7 connects the wrapping layer 13, the shielding layer 14, and the outer sheath 15. The outlet of the liquid outlet pipe 7 is funnel-shaped and a cooling plug 8 that cooperates with the outlet is provided at the outlet. It also includes an elastic element 9 that allows the cooling plug 8 to fit tightly against the outlet of the liquid outlet pipe 7 in the initial state. One end of the elastic element 9 is welded to the end of the cooling plug 8, and the other end of the elastic element 9 is welded to the bracket 10. The bracket 10 is threaded to the wall of the connecting pipe 21. After the water valve 16 in the outlet pipe 17 is closed, a large amount of water continuously entering the cooling layer 12 will flow from the outlet pipe 7. The continuously increasing water pressure will push the cooling plug 8 at the outlet of the liquid outlet pipe 7 to move outward. After the cooling plug 8 is opened, the water in the cooling layer 12 splashes to the outside of the cable. After the water evaporates, it absorbs heat and will take away the heat of the cable again, achieving a better secondary cooling effect. After the water valve 16 is opened, the elastic element 9 fixed to the end of the cooling plug 8 rebounds, causing the cooling plug 8 to block the liquid outlet again, thus realizing the intelligent opening and closing of the liquid outlet pipe 7. The water flowing out of the water outlet pipe 17 can be collected for reuse and pumped back into the water inlet pipe 6, saving energy and reducing costs.

[0029] A temperature sensor fixed to the outside of the conductor is connected in series with the controller and water valve 16 in the same circuit. The temperature sensor is a PT100, a platinum resistance temperature sensor with extremely small deviation, stable electrical performance, vibration resistance, and high reliability. It also has advantages such as high accuracy and sensitivity, good stability, long product life, and easy installation. The temperature sensor transmits a signal to the controller when a high temperature is detected. The controller uses an STM32F103C8T6 microcontroller to close the water valve 16 of the outlet pipe 17. The temperature sensor is a metal resistance temperature device. The resistance of a metal resistance temperature device increases in the positive direction. As the temperature rises, the resistance increases, thereby transmitting a signal to the controller. The controller controls the closure of the water valve 16, realizing the secondary cooling function of the invention.

[0030] It also includes a positioning ball 2 and an anti-torsion component arranged along the central longitudinal axis.

[0031] The outer diameter ends of the conductor abut against the central frame 1 and the inner sheath 11 respectively, and the conductor is well positioned radially.

[0032] The anti-torsion component is a hollow elastic member, divided into multiple independent receiving cavities along the central longitudinal axis. The receiving cavities are filled with liquid. The two sides of the anti-torsion component are fixed to the inner wall surface of the inner sheath 11 and the outer surface of the central skeleton 1, respectively. Multiple buffer parts 3 communicating with the receiving cavities are provided on the outer edge of the anti-torsion component. The buffer parts 3 have cavities inside and are in close contact with the conductor. The elasticity of the anti-torsion component itself allows it to deform when subjected to the torsional force of the conductor, squeezing the internal liquid into the receiving cavity of the buffer part 3. The receiving cavity will also expand after a large amount of liquid flows in, providing buffer and rebound force for the tortuous conductor. This undoubtedly improves the cable's anti-torsion ability. The liquid in the receiving cavity can provide heat dissipation for the conductor. In the event of a cable fire, the anti-torsion component is burned and broken by the fire, and the liquid in the receiving cavity flows out, which also has a fire extinguishing effect.

[0033] The conductor includes an aluminum alloy core 22 and an outer insulation layer 5 and a waterproof layer 4. The aluminum alloy core 22 is lighter, more corrosion-resistant, and cheaper than the copper core. The outer waterproof layer 4 can cope with the extreme situation of liquid leakage in the cavity when the anti-torsion component is damaged.

[0034] The anti-torsion component is attached to the surface of the inner sheath 11 and connects to the connecting pipe 21. When the connecting pipe 21 is opened, it connects the inner sheath 11, the wrapping layer 13, the shielding layer 14, and the outer sheath 15. The outlet of the connecting pipe 21 is funnel-shaped and has a plug 18 that mates with the outlet. It also includes a spring 19 that allows the plug 18 to fit tightly against the outlet of the connecting pipe 21 in the initial state. One end of the spring 19 is fixed to the end of the plug 18, and the other end of the spring 19 is fixed to the stabilizer 20. The stabilizer is threadedly connected to the wall of the connecting pipe 21. When the plug 18 is working normally, it completely blocks the flow. When the anti-torsion component is subjected to excessive torsional force from the conductor, the deformation caused by the internal compression of the anti-torsion component causes the liquid inside the anti-torsion component to exert huge pressure on the plug 18 at the opening of the connecting pipe 21, causing the plug 18 at the opening of the connecting pipe 21 to be pushed outward. The spring 19 then undergoes elastic deformation, and the pigmented liquid inside the anti-torsion component rushes out from the opening of the connecting pipe 21 through the outer inner sheath 11, wrapping layer 13, shielding layer 14 and outer sheath 15, spraying onto the outside of the cable, thereby achieving the purpose of warning the user and prompting the user to carry out timely maintenance.

[0035] The anti-torsion component contains a positioning ball 2 made of elastic material. The two ends of the positioning ball 2 abut against the central skeleton 1 and the inner sheath 11. The liquid filling the cavity inside the anti-torsion component and the positioning ball 2 made of elastic material provide good buffering for the conductor when the cable is subjected to torsional force, reducing the torsional force of the conductor. At the same time, the liquid inside the anti-torsion component also provides good heat dissipation for the cable. The cooperation between the positioning ball 2 and the central skeleton 1 inside the anti-torsion component provides good radial support for the cable core, so that the cable has a certain compressive strength.

[0036] The water filling channel fixed between the cooling layer 12 and the anti-torsion component can be manually controlled to open and close, which allows the liquid inside the anti-torsion component to be filled according to the user's actual needs.

[0037] The inner sheath 11 is designed to prevent the insulation layer 5 from being affected by moisture, mechanical damage, light and chemical corrosive media, while also allowing short-circuit current to flow through it.

[0038] The wrapping layer 13 serves to protect the insulation or inner sheath 11, acting as a buffer and padding. During cable use, different materials provide different functions such as heat insulation, corrosion prevention, and anti-aging for the cable insulation or inner sheath 11. It keeps the wire cylindrical to prevent it from loosening, prevents signal interference, and provides insulation between the conductor and the shielding layer 14. The polyvinylidene fluoride wrapping layer 13 has good heat resistance, wear resistance, and chemical resistance, as well as excellent impact strength and electrical insulation properties.

[0039] The shielding layer 14 eliminates the increase in surface electric field intensity caused by the roughness of the conductor surface and the inner sheath 11 surface.

[0040] The outer sheath 15 is made of polyurethane material, which improves the strength of the cable and provides corrosion protection.

[0041] Compared with traditional solutions, this solution not only provides anti-torsion protection for the cable, enables heat dissipation treatment of the cable, and alerts users to perform timely maintenance when the cable encounters destructive torsional forces, but also provides long-term cooling treatment for the cable, significantly improving the cooling effect of the cable.

[0042] The above are merely embodiments of the present invention. The invention is not limited to the fields covered by these embodiments. Commonly known structures and characteristics in the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are able to access all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An aluminum alloy core power cable, comprising a cable core and an inner sheath, a wrapping layer, a shielding layer, and an outer sheath sequentially wrapped around the cable core, wherein the cable core includes a central skeleton arranged along a central longitudinal axis and multiple conductors, characterized in that, Also includes: The cooling layer comprises a cooling layer, a support, a cooling plug, and an elastic element. The cooling layer is fixed between the inner sheath and the wrapping layer, and the cooling layer contains a sealed cavity. One end of the cooling layer has a water inlet pipe, and the other end has a water outlet pipe. Both the water inlet pipe and the water outlet pipe pass through the wrapping layer, the shielding layer, and the outer sheath in sequence and connect to the cavity. A water valve is fixed at the outlet of the water outlet pipe. Several liquid outlet pipes are connected to the cooling layer. The liquid outlet pipes pass through the wrapping layer, the shielding layer, and the outer sheath in sequence and connect to the cavity inside the cooling layer. The outlet of the liquid outlet pipe is funnel-shaped, and a cooling plug is fixed at the outlet. The cooling layer also includes an elastic element that allows the cooling plug to fit tightly against the outlet of the liquid outlet pipe in the initial state. One end of the elastic element is fixedly connected to the end of the cooling plug, and the other end of the elastic element is fixed to the support. The support is fixed to the wall of the connecting pipe. It also includes a controller and a temperature sensor. The temperature sensor is fixed on the outside of the wire and is connected in series with the controller and the water valve in the same circuit. The temperature sensor is used to transmit a signal to the controller when a high temperature is detected. The controller is used to close the water valve in the outlet pipe when it receives the high temperature signal.

2. The aluminum alloy core power cable according to claim 1, characterized in that: It also includes elastic anti-torsion components arranged along the central longitudinal axis. Each anti-torsion component has a hollow receiving cavity filled with a liquid containing pigment. The anti-torsion component is fixed on both sides of the inner wall surface of the inner sheath and the outer surface of the central skeleton, respectively. Multiple buffer parts communicating with the receiving cavity are provided on the outer edge of the anti-torsion component. Each buffer part has a cavity and is in close contact with the outer side of the wire. The outer diameter ends of the wire abut against the central skeleton and the inner sheath, respectively. The anti-torsion component is attached to the surface of the inner sheath side. The anti-torsion component is connected to a connecting pipe. The connecting pipe sequentially connects the inner sheath, the wrapping layer, the shielding layer, and the outer sheath. The outlet of the connecting pipe is funnel-shaped. It also includes a plug and a spring that allows the plug to fit tightly against the outlet of the connecting pipe in the initial state. One end of the spring is fixed to the end of the plug, and the other end of the spring is fixed to a stabilizing frame. The stabilizing frame is fixed to the wall of the connecting pipe.

3. The aluminum alloy core power cable according to claim 2, characterized in that: It also includes a water filling channel fixed between the cooling layer and the anti-torsion component, and the water filling channel is equipped with a valve.

4. The aluminum alloy core power cable according to claim 1, characterized in that: The outer sheath is made of polyurethane material.

5. The aluminum alloy core power cable according to claim 1, characterized in that: The conductor includes an aluminum alloy core and an outer insulation layer and a waterproof layer.

6. The aluminum alloy core power cable according to claim 1, characterized in that: The wrapping layer is made of polyvinyl fluoride.

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