A power generating cable

Abstract

The application discloses a power generation cable and particularly relates to the technical field of electric wires and cables, which comprises a conductor, an insulation layer, a filling layer, a shielding layer, an inner sheath and an outer sheath, a heat preservation layer and a heat insulation layer are sequentially arranged between the outer sheath and the inner sheath, forming a heat preservation cavity, a heat dissipation cavity and a temperature insulation cavity from inside to outside; the heat dissipation cavity is in communication with the heat preservation cavity and the temperature insulation cavity through spiral grooves. The heat preservation cavity, the heat dissipation cavity and the temperature insulation cavity are arranged, on one hand, the cooling mode can be adjusted according to the temperature inside and outside the cable, the cooling effect is improved, the temperature inside the cable is prevented from being too high, the transmission efficiency of the cable is improved, the overall service life of the cable is improved, on the other hand, the communication area of the heat dissipation groove and the flow-through groove can be adjusted according to the temperature inside the cable, too much external extremely cold air can be avoided, the heat preservation effect is better, the heat dissipation effect and the heat preservation effect can be adaptively adjusted according to the temperature inside the cable, and the temperature of the cable is prevented from being too high or too low.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and more specifically, to a power generation cable. Background Technology

[0002] Wind power cables are cables specifically designed for wind power generation systems. They are primarily used to connect various components of a wind turbine generator, such as the tower, generator, and control system, and to transmit the electrical energy generated by the wind turbine to the power grid. Wind power cables not only transmit electrical energy but also handle the transmission of control signals and data, ensuring the normal operation and remote monitoring of the wind power generation system.

[0003] Wind power cables must not only meet the performance requirements of ordinary cables, but also possess the basic characteristics of flexibility and frequent torsion (to adapt to the automatic yaw of wind turbines), ultra-high vertical tensile strength (to adapt to the vertical suspension laying of wind turbines), resistance to acid and alkali corrosion, salt spray corrosion, and seawater corrosion (to adapt to the power connection of offshore wind turbines). Due to the abundance of wind resources in northern my country, and the large number of wind turbines installed in northern my country, the climate in the north is colder, and the temperature difference between day and night is large. Therefore, wind power cables also need to have extremely high cold resistance.

[0004] Chinese patent application number CN202410662160.6 discloses a cold-resistant and high-temperature-resistant special structure new energy wind power cable, relating to the field of cable technology. The wind power cable includes an inner core, an outer sheath, and an insulation layer between the inner core and the outer sheath. The insulation layer includes an inner spiral layer, an isolation layer, and an outer spiral layer from the inside out. The inner spiral layer includes an inner spiral support, and the outer spiral layer includes an outer spiral support. The spiral structure of the inner and outer spiral supports inside the new energy wind power cable can improve the cable's bending and torsional resistance, and at the same time, it can form an inner spiral air channel and an outer spiral air channel. The inner and outer spiral air channels can be combined to form an air channel that wraps the cable almost completely. In high-temperature environments, the air channels allow air to pass through, isolating high temperatures and carrying away heat. In low-temperature environments, they isolate low temperatures, which is beneficial to the insulation of the cable, forming the cable's cold-resistant and high-temperature-resistant characteristics. The invention also proposes a production equipment for forming an insulation layer on the cable.

[0005] Although the wind power cable of the above invention can insulate against high temperatures and carry away heat, and insulate against low temperatures in low-temperature environments, which is beneficial for the insulation of the cable, the cable can only cool down through the air passage when the internal temperature is too high. The cooling effect is singular, which will cause the internal temperature of the cable to gradually rise. When the cable is too hot, the resistivity will increase, resulting in a decrease in the cable transmission efficiency and affecting the overall life of the cable. At the same time, in extremely cold environments, the extremely cold air will carry away the internal temperature of the cable through the air passage, making the internal temperature of the cable too low, which will increase the resistance of the cable conductor and reduce the power transmission efficiency. Low temperature will also cause the insulation material to become brittle or even crack, thereby reducing the insulation performance and potentially causing leakage or short circuit risks.

[0006] This invention provides a power generation cable, which aims to solve the problems of the single cooling effect of existing wind power generation cables, which leads to a gradual increase in the internal temperature of the cable, affecting the overall life of the cable, and the cable's conductor resistance increasing, reducing insulation performance, and causing leakage or short circuit risks when the air passes through the air passage in extremely cold environments. Summary of the Invention

[0007] The purpose of this invention is to provide a power generation cable to solve the problems mentioned in the background art, such as the single cooling effect of wind power generation cables, which leads to a gradual increase in the internal temperature of the cable, affecting the overall life of the cable, and the problem that in extremely cold environments, the air passing through the air passage carries the internal temperature of the cable, which increases the resistance of the cable conductor, reduces the insulation performance, and causes the risk of leakage or short circuit.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a power generation cable, comprising a conductor, an insulation layer, a filling layer, a shielding layer, an inner sheath, and an outer sheath.

[0009] A heat insulation layer and a heat insulation layer are sequentially provided between the outer sheath and the inner sheath, forming a heat insulation cavity, a heat dissipation cavity, and a heat insulation cavity from the inside out; the heat dissipation cavity is connected to the heat insulation cavity and the heat insulation cavity respectively through spiral channels;

[0010] It also includes a flow regulation component, which includes a sealing groove, an adjusting element, and a sealing ring. The adjusting element drives the sealing ring to move based on the expansion and contraction of the thermal expansion material, thereby controlling the heat exchange between the heat dissipation cavity and the outside world.

[0011] Preferably, the insulation layer is provided with a first spiral groove, the heat insulation layer is provided with a second spiral groove, the first spiral groove and the second spiral groove are staggered, the heat dissipation cavity is connected to the insulation cavity through the first spiral groove, and is connected to the heat insulation cavity through the second spiral groove.

[0012] Preferably, the heat dissipation cavity is provided with a spiral elastic element, the width of which is greater than the width of the first spiral groove and the second spiral groove. In the initial state, the elastic element covers the second spiral groove to block the communication between the heat insulation cavity and the heat dissipation cavity.

[0013] Preferably, both ends of the elastic element are connected to sliding plates, and the two sliding plates are respectively slidably disposed in the two sealing grooves at both ends of the outer sheath. Each of the two sealing grooves is provided with a thermal expansion material. The thermal expansion material expands when heated, pushing the corresponding sliding plate to move, thereby driving the elastic element to release the blockage of the second spiral groove.

[0014] Preferably, the insulation layer and the heat insulation layer are respectively provided with a first heat conduction groove and a second heat conduction groove. The first heat conduction groove and the second heat conduction groove are configured to transfer the heat of the insulation cavity and the heat insulation cavity to the corresponding sealing groove, so as to trigger the expansion of the thermal expansion material and drive the adjusting member and the sealing ring to adjust the opening of the heat dissipation channel.

[0015] Preferably, the sealing ring is fixedly connected to the adjusting member, and the sealing ring is slidably disposed in the adjusting grooves at both ends of the outer sheath. The two ends of the outer sheath are respectively provided with heat dissipation grooves communicating with the heat dissipation cavity and flow grooves communicating with the outside on both sides corresponding to the adjusting grooves.

[0016] Preferably, the moving direction of the adjusting member is parallel to the moving direction of the sliding plate. When the thermal expansion material expands, it pushes the adjusting member to compress the gas in the sealing groove, so that the sealing ring moves away from the heat dissipation groove to increase the opening of the heat dissipation channel.

[0017] Preferably, a limiting block is provided in the sealing groove to limit the displacement of the sliding plate and ensure that the initial position of the elastic element covers the second spiral groove.

[0018] Preferably, both the thermal insulation layer and the heat insulation layer are provided with support strips, which penetrate the first spiral groove and the second spiral groove to enhance the structural strength.

[0019] Preferably, the outer sheath has a multi-segment structure, and adjacent segments of the outer sheath are interconnected through corresponding flow grooves.

[0020] The technical effects and advantages of this invention are as follows:

[0021] 1. This invention, through the design of structures such as heat preservation chamber, heat dissipation chamber, and heat insulation chamber, can, on the one hand, adjust the cooling mode according to the internal and external temperatures of the cable, improve the cooling effect, prevent the internal temperature of the cable from becoming too high, improve the cable transmission efficiency and the overall life of the cable. On the other hand, it can adjust the communication area between the heat dissipation groove and the flow groove according to the internal temperature of the cable, which can prevent excessive entry of extremely cold external air and better heat preservation. Thus, it can adaptively adjust the heat dissipation and heat preservation effects according to the internal temperature of the cable, and avoid the cable temperature from becoming too high or too low. Attached Figure Description

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

[0023] Figure 2 This is a cross-sectional view of the overall internal structure of the present invention.

[0024] Figure 3 This is a cross-sectional view of the internal structure of the outer sheath of the present invention.

[0025] Figure 4 For the present invention Figure 3 Enlarged view of the structure of part A.

[0026] Figure 5 For the present invention Figure 4 Enlarged view of the structure of part B.

[0027] Figure 6 This is a cross-sectional view of the unblocking state of the sealing ring of the present invention.

[0028] Figure 7 This is a cross-sectional view of the internal structure of the sealing groove portion of the present invention.

[0029] Figure 8 This is a partial structural cross-sectional view of the thermal insulation layer and heat insulation layer of the present invention.

[0030] Figure 9 This is a schematic diagram of the elastic element structure of the present invention.

[0031] Figure 10 This is a schematic diagram of the adjusting component structure of the present invention.

[0032] The attached figures are labeled as follows: 1. Conductor; 11. Insulating layer; 12. Filling layer; 13. Shielding layer; 14. Inner sheath; 15. Outer sheath; 2. Thermal insulation layer; 21. First spiral groove; 3. Heat insulation layer; 31. Second spiral groove; 4. Elastic element; 5. Sealing groove; 51. Sliding plate; 52. First heat conduction groove; 53. Second heat conduction groove; 54. Limiting block; 55. Flow groove; 56. Adjusting groove; 57. Heat dissipation groove; 58. Adjusting element; 59. Sealing ring; 6. Thermal insulation cavity; 7. Heat dissipation cavity; 8. Thermal insulation cavity. Detailed Implementation

[0033] 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.

[0034] In existing wind power cables, cooling can only be achieved through air ducts when the internal temperature is too high. This single cooling method leads to a gradual increase in the internal temperature of the cable. When the cable becomes too hot, the resistivity increases, resulting in a decrease in cable transmission efficiency and affecting the overall lifespan of the cable. At the same time, in extremely cold environments, the frigid air passing through the air ducts carries away the internal temperature of the cable, causing the internal temperature to drop too low. This increases the resistance of the cable conductor, reduces the power transmission efficiency, and the low temperature can also cause the insulation material to become brittle or even crack, thereby reducing insulation performance and potentially causing leakage or short circuit risks.

[0035] refer to Figures 1 to 10 An embodiment of the present invention provides a power generation cable comprising a plurality of conductors 1, each conductor 1 being wrapped with an insulation layer 11, the plurality of insulation layers 11 being wrapped with a filler layer 12, the filler layer 12 being wrapped with a shielding layer 13, the shielding layer 13 being wrapped with an inner sheath 14, the inner sheath 14 being wrapped with an outer sheath 15, the outer sheath 15 being composed of multiple segments.

[0036] refer to Figures 2 to 6 Each section of the outer sheath 15 and the inner sheath 14 is provided with a heat insulation layer 2 and a heat insulation layer 3 from the inside to the outside. The outer sheath 15 and the shielding layer 13 are separated from the inside to the outside by the heat insulation layer 2 and the heat insulation layer 3 into a heat insulation cavity 6, a heat dissipation cavity 7 and a heat insulation cavity 8.

[0037] refer to Figure 3 Figure 6 and Figure 8 The insulation layer 2 and the heat insulation layer 3 are respectively provided with a first spiral groove 21 and a second spiral groove 31 arranged in an alternating manner. The heat insulation cavity 6 is connected to the heat dissipation cavity 7 through the first spiral groove 21, and the heat insulation cavity 8 is connected to the heat dissipation cavity 7 through the second spiral groove 31. A spirally arranged elastic element 4 is slidably connected in the heat dissipation cavity 7. The width of the elastic element 4 is greater than the groove width of the first spiral groove 21 and the second spiral groove 31. Both the insulation layer 2 and the heat insulation layer 3 are provided with multiple support strips that penetrate the first spiral groove 21 and the second spiral groove 31 to improve the strength of the insulation layer 2 and the heat insulation layer 3.

[0038] refer to Figure 3 , Figure 4 , Figure 8 and Figure 9Each outer sheath 15 has a sealing groove 5 at both ends. The elastic element 4 has a sliding plate 51 that is slidably connected to the two sealing grooves 5 at both ends. The heat insulation cavity 6 and the heat insulation cavity 8 are respectively provided with a first heat conduction groove 52 and a second heat conduction groove 53 corresponding to the positions of the two sealing grooves 5. A limit block 54 is provided in the sealing groove 5 corresponding to the position of the first heat conduction groove 52. The two sliding plates 51 at both ends of the elastic element 4 are limited in the two sealing grooves 5, which can provide the cable with bending and torsion resistance.

[0039] refer to Figures 1 to 10 Each outer sheath 15 has multiple flow grooves 55 at both ends that communicate with the outside. Each outer sheath 15 also has adjustment grooves 56 at both ends that correspond to and communicate with the multiple flow grooves 55. Each heat dissipation cavity 7 has heat dissipation grooves 57 at both ends that communicate with the corresponding flow grooves 55. The number of heat dissipation grooves 57 and flow grooves 55 are the same and their positions are corresponding. Each adjustment groove 56 is connected to a corresponding sealing groove 5. An adjustment element 58 is slidably connected inside the sealing groove 5. Each adjustment element 58 has a sealing ring 59 fixedly connected to both sides that is slidably connected inside the corresponding heat dissipation groove 57. Thermal expansion material, such as expanded graphite, is provided inside the sealing groove 5 between each adjustment element 58 and the corresponding sliding plate 51. Gas is filled inside the sealing groove 5 on the side of each adjustment element 58 away from the corresponding sliding plate 51. Adjacent outer sheaths 15 are interconnected through corresponding flow grooves 55.

[0040] For specific usage, please refer to... Figures 3 to 5 In the initial state, the thermal expansion material in the two sealing grooves 5 is in an unexpanded state. At this time, the elastic element 4 corresponds to the position of the second spiral groove 31 and blocks the second spiral groove 31. The heat insulation cavity 6 is connected to the heat dissipation cavity 7 through the first spiral groove 21. The two sealing rings 59 can block the corresponding multiple heat dissipation grooves 57. When the external temperature of the cable is higher than the internal temperature of the cable, the heat insulation layer 3 can isolate the external high temperature in the heat insulation cavity 8 to prevent the high temperature from directly entering the inside of the cable, so that the cable has high temperature resistance characteristics.

[0041] The external temperature entering the insulation cavity 8 will enter the second heat conduction groove 53 and be transferred to the corresponding sealing groove 5 through the second heat conduction groove 53. At this time, the thermal expansion material in the sealing groove 5 will expand when heated. Since the sealing groove 5 corresponding to the position of the first heat conduction groove 52 is provided with a limiting block 54, the thermal expansion material in the sealing groove 5 corresponding to the second heat conduction groove 53 cannot directly overcome the elastic force of the elastic member 4 after expansion. The sliding plate 51 corresponding to the position of the first heat conduction groove 52 will be limited by the limiting block 54 and cannot move. Therefore, the elastic member 4 will be in the initial position and cannot move.

[0042] At the same time, the thermal expansion material in the second heat conduction groove 53 expands when heated, which will push the corresponding adjustment member 58 to move away from the elastic member 4 and compress the air on the other side of the adjustment member 58. During the movement of the adjustment member 58 away from the elastic member 4, it will drive the corresponding sealing ring 59 to release the sealing of multiple corresponding heat dissipation grooves 57, so that multiple heat dissipation grooves 57 can communicate with multiple corresponding flow grooves 55. At this time, one end of the heat dissipation cavity 7 can communicate with the outside air and can perform preliminary cooling.

[0043] The heat generated during the operation of multiple conductors 1 enters the insulation cavity 6 and can enter the heat dissipation cavity 7 through the first spiral groove 21 for cooling. At the same time, the heat entering the insulation cavity 6 enters the first heat conduction groove 52 and is transferred to the corresponding sealing groove 5 through the first heat conduction groove 52. This causes the thermal expansion material in the first heat conduction groove 52 and the corresponding sealing groove 5 to expand, thereby pushing the corresponding adjusting member 58 to move away from the elastic member 4 and compressing the air on the other side of the adjusting member 58. During the movement of the adjusting member 58 away from the elastic member 4, it will drive the corresponding sealing ring 59 to release the blockage of the multiple corresponding heat dissipation grooves 57, so that the multiple heat dissipation grooves 57 can communicate with the multiple corresponding flow grooves 55. At this time, both ends of the heat dissipation cavity 7 can be connected to the external air, allowing air to circulate in the heat dissipation cavity 7, further improving the cooling effect and accelerating the heat dissipation of conductor 1.

[0044] When the internal temperature of the cable is higher than the external temperature of the cable, refer to Figure 6 The expansion degree of the thermal expansion material corresponding to the position of the first heat conduction groove 52 is greater than that of the thermal expansion material corresponding to the position of the second heat conduction groove 53. At this time, the thermal expansion material corresponding to the position of the first heat conduction groove 52 will push the sliding plate 51 and the elastic element 4 to move towards the direction of the second heat conduction groove 53. During the movement, the elastic element 4 will gradually release the blockage of the second spiral groove 31, so that the heat insulation cavity 6, the heat dissipation cavity 7 and the heat insulation cavity 8 can be interconnected. At this time, the heat in the heat insulation cavity 6 can be transferred to the heat insulation cavity 8, so that the higher temperature inside the cable can mix with the lower temperature inside the heat insulation cavity 8, further improving the cooling effect and achieving rapid cooling.

[0045] When the internal temperature of the cable returns to normal or is lower than the external temperature of the cable, the elastic element 4 returns to its initial position and re-seals the second spiral groove 31 to prevent heat from the outside that is higher than the operating temperature of the conductor 1 from entering the inside of the cable.

[0046] When the cable is at an extremely cold temperature, the temperature inside the insulation cavity 8 and the second heat conduction groove 53 is insufficient to cause the thermal expansion material in the corresponding sealing groove 5 to expand. The sliding plate 51 will drive the sealing ring 59 to seal the multiple heat dissipation grooves 57 under the action of the air on the other side, so that one end of the heat dissipation cavity 7 cannot be connected to the outside air, preventing the extremely cold temperature from directly entering the cable.

[0047] At this time, the temperature of conductor 1 during operation will enter the insulation cavity 6 and the heat dissipation cavity 7 through the first spiral groove 21. When the internal temperature of the insulation cavity 6 and the heat dissipation cavity 7 is too high, the temperature in the insulation cavity 6 will be transferred to the corresponding sealing groove 5 through the first heat conduction groove 52, causing the corresponding thermal expansion material to expand. This pushes the corresponding adjusting component 58 to drive the sealing ring 59 to release the sealing of multiple corresponding heat dissipation grooves 57, allowing one end of the heat dissipation cavity 7 to communicate with the outside air for cooling. When the temperature in the insulation cavity 6 returns to the normal operating temperature, the thermal expansion material in the sealing groove 5 corresponding to the first heat conduction groove 52 will recover and stop expanding. The compressed air on the corresponding side of the adjusting component 58 will push the adjusting component 58 back to drive the sealing ring 59 back to the initial position, resealing the multiple corresponding heat dissipation grooves 57, so that both ends of the heat dissipation cavity 7 cannot communicate with the outside air, preventing cold air from entering the cable and better insulating the inside of the cable, avoiding direct temperature loss.

[0048] It should be noted that the reference Figure 5 The thermal expansion material expands according to the temperature. On the one hand, when the temperature is high, it can push the adjusting component 58 to move the sealing ring 59 further away from the heat dissipation groove 57, increasing the connection area between the heat dissipation groove 57 and the flow groove 55, thus cooling down faster. On the other hand, when the temperature is low, it can push the adjusting component 58 to move the sealing ring 59 closer to the heat dissipation groove 57, reducing the connection area between the heat dissipation groove 57 and the flow groove 55, thus preventing excessive entry of extremely cold air and providing better heat preservation. Therefore, it can adaptively adjust the heat dissipation and heat preservation effects according to the internal temperature of the cable, preventing the cable temperature from being too high or too low.

[0049] In summary, the design of the insulation cavity 6, heat dissipation cavity 7, and heat insulation cavity 8 allows for the adjustment of the cooling mode based on the internal and external temperatures of the cable, improving the cooling effect, preventing excessive internal temperature, and enhancing cable transmission efficiency and overall lifespan. Furthermore, it enables the adjustment of the communication area between the heat dissipation groove 57 and the flow groove 55 based on the internal cable temperature, preventing excessive entry of extremely cold external air and improving insulation. This allows for adaptive adjustment of heat dissipation and insulation effects according to the internal cable temperature, preventing excessively high or low cable temperatures.

[0050] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power generation cable, comprising a conductor, an insulation layer, a filling layer, a shielding layer, an inner sheath, and an outer sheath, characterized in that: A heat insulation layer and a heat insulation layer are sequentially provided between the outer sheath and the inner sheath, forming a heat insulation cavity, a heat dissipation cavity, and a heat insulation cavity from the inside out; the heat dissipation cavity is connected to the heat insulation cavity and the heat insulation cavity respectively through spiral channels; It also includes a flow regulation component, which includes a sealing groove, a regulating element and a sealing ring. The regulating element drives the sealing ring to move based on the expansion and contraction of the thermal expansion material, thereby realizing the heat exchange control between the heat dissipation cavity and the outside world. The thermal insulation layer is provided with a first spiral groove, and the heat insulation layer is provided with a second spiral groove. The first spiral groove and the second spiral groove are staggered. The heat dissipation cavity is connected to the thermal insulation cavity through the first spiral groove and to the heat insulation cavity through the second spiral groove. The heat dissipation cavity is provided with a spiral elastic element. The width of the elastic element is greater than the width of the first spiral groove and the second spiral groove. In the initial state, it covers the second spiral groove to block the communication between the heat insulation cavity and the heat dissipation cavity. Both ends of the elastic element are connected to sliding plates. The two sliding plates are respectively slidably disposed in the two sealing grooves at both ends of the outer sheath. The two sealing grooves are provided with thermal expansion material. The thermal expansion material expands when heated, pushing the corresponding sliding plate to move, thereby driving the elastic element to release the blockage of the second spiral groove. The insulation layer and the heat insulation layer are respectively provided with a first heat conduction groove and a second heat conduction groove. The first heat conduction groove and the second heat conduction groove are configured to transfer the heat of the insulation cavity and the heat insulation cavity to the corresponding sealing groove, so as to trigger the expansion of the thermal expansion material and drive the adjusting component and the sealing ring to adjust the opening of the heat dissipation channel. The sealing ring is fixedly connected to the adjusting member. The sealing ring is slidably disposed in the adjusting grooves at both ends of the outer sheath. The two ends of the outer sheath are respectively provided with heat dissipation grooves that connect to the heat dissipation cavity and flow grooves that connect to the outside on both sides corresponding to the adjusting grooves. The moving direction of the adjusting component is parallel to the moving direction of the sliding plate. When the thermal expansion material expands, it pushes the adjusting component to compress the gas in the sealing groove, so that the sealing ring moves away from the heat dissipation groove to increase the opening of the heat dissipation channel.

2. The power generation cable according to claim 1, characterized in that: The sealing groove is provided with a limiting block to limit the displacement of the sliding plate and ensure that the initial position of the elastic element covers the second spiral groove.

3. The power generation cable according to claim 2, characterized in that: Both the thermal insulation layer and the heat insulation layer are provided with support strips, which penetrate the first spiral groove and the second spiral groove to enhance the structural strength.

4. The power generation cable according to claim 3, characterized in that: The outer sheath has a multi-segment structure, and adjacent segments of the outer sheath are interconnected through corresponding flow grooves.

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