Weather-resistant insulated low-voltage power cable

Abstract

The application discloses a weather-resistant insulated low-voltage power cable applied to the field of power cables, when the temperature difference in the use environment is large, the wire main body and the filling layer will appear large deformation, when the wire main body and the filling layer expand due to the temperature being too high, the movable shell one and the movable shell two of the self-adaptive cover body will separate from each other, when the temperature decreases and the volume of the wire main body and the filling layer returns to normal, under the action of the plurality of constraint rings, the elastic shell and the movable shell one will recombine, so that the movable shell one and the movable shell two always adhere to the surface of the wire main body and the filling layer, and the design of the linkage cable can make the deformation of the movable shell one and the movable shell two more uniform when the wire main body and the filling layer locally excessively deform under the action of the constraint ring of local deformation in the process that the movable shell one and the movable shell two deform, and the phenomenon that the movable shell one and the movable shell two locally excessively deform and are damaged is not prone to occurring.

Description

Technical Field

[0001] This invention relates to the field of power cables, and in particular to a weather-resistant insulated low-voltage power cable. Background Technology

[0002] Power cables are cables used to transmit and distribute high-power electrical energy. They consist of a conductor, insulation layer, shielding layer, and protective layer, and are mainly laid in urban underground power grids, power plant lead-out lines, and other similar applications. They are classified by voltage level into low-voltage, medium-voltage, high-voltage, and ultra-high-voltage cables, and the insulation materials include polypropylene, cross-linked polyethylene, and other types.

[0003] The utility model patent with announcement number CN208189286U discloses a power cable with large temperature difference resistance. The design of the sheath cross-section is circular, and the sheath material is F46 resin, which has the advantage of large temperature difference resistance. It can be used continuously in the temperature range of -85℃ to +200℃.

[0004] The utility model patent with announcement number CN213459134U discloses a cable resistant to temperature differences. It features a temperature difference-resistant mechanism wrapped around the cable core to protect it from damage caused by temperature differences in the external environment. The first and second conduits provide support, and the buffer component can cushion the pressure on the cable caused by the contraction of objects when they cool, preventing damage to the cable's internal structure. The heat insulation layer wrapped around the cable core prevents the temperature of the external environment from being transferred to the cable core, thus avoiding damage.

[0005] In regions with large temperature differences, power cables are prone to frequent thermal expansion and contraction due to temperature variations. The protective layer of the power cable is easily damaged during these frequent expansions and contractions, and the protective layer cannot effectively protect the internal structure, significantly reducing the service life of the power cable. Summary of the Invention

[0006] The core of this invention lies in solving the problem of damage to the protective layer of power cables during frequent expansion and contraction in existing technologies through the cooperation of movable shell one and movable shell two, thereby extending the service life of power cables.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A weather-resistant insulated low-voltage power cable includes an elastic shell and multiple wire bodies. The elastic shell is sleeved on the outside of the multiple wire bodies, and a filling layer is filled between the elastic shell and the multiple wire bodies. The outside of the elastic shell is covered with an adaptive cover, which includes a movable shell one and a movable shell two that match each other. A cable jacket is sleeved on the outside of the adaptive cover, and multiple elastic fibers are fixedly connected to the inner wall of the cable jacket. The multiple elastic fibers are interlaced to form a spatial three-dimensional structure.

[0009] The movable shell 1 includes a fan-shaped outer shell 1, with mating fins 1 fixedly connected to both side walls of the fan-shaped outer shell 1. Multiple parallel constraint grooves 1 are formed inside the fan-shaped outer shell 1, extending to the inner wall of the mating fins 1. The movable shell 2 includes a fan-shaped outer shell 2 matching the size of the fan-shaped outer shell 1. Two mating fins 2 are fixedly connected to both side walls of the fan-shaped outer shell 2, with two mating fins 1 covering the outer sides of two mating fins 2. Multiple parallel constraint grooves 2 are formed inside the fan-shaped outer shell 2, extending to the outer wall of the fins 2. Multiple positions of the constraint grooves 1 and 2 are mutually matched, forming complete annular grooves. Multiple annular grooves are each inserted with... Within each of the constraint rings, a pair of linkage cables are embedded in the sector-shaped outer shell 1 and sector-shaped outer shell 2. Both linkage cables are spiral-shaped and intertwined. The two linkage cables are located on the upper and lower sides of multiple constraint rings, respectively, and the intersection points of the two linkage cables are located between two adjacent constraint rings. Both movable shell 1 and movable shell 2 are always in contact with the surface of the wire body and the filling layer, and always provide protection for the wire body and the filling layer. The design of a pair of linkage cables can drive the nearby constraint rings to deform under the action of the locally deformed constraint rings during the deformation of movable shell 1 and movable shell 2. When there is excessive local deformation of the wire body and the filling layer, the deformation of movable shell 1 and movable shell 2 will also be more uniform.

[0010] Furthermore, movable shell one and movable shell two are made of elastic material, while the linkage cable is made of non-elastic material. The linkage cable made of non-elastic material has a better pulling effect on the adjacent constraint ring when movable shell one and movable shell two are deformed.

[0011] Furthermore, the surfaces of mating fin one and mating fin two that are close to each other are both frosted, which increases the sealing effect at the moving parts of movable shell one and movable shell two.

[0012] Furthermore, a constraint net is fitted on the outer side of the adaptive cover. The constraint net is woven from elastic thin ropes and has an overall tendency to contract inward. By using the constraint net in conjunction with the linkage cable, the deformation of movable shell one and movable shell two as a whole becomes more gradual.

[0013] Meanwhile, multiple filling units are filled between the active shell and the cable jacket. Each filling unit includes a spherical core, which is filled with multiple water-absorbing units. The water-absorbing units are made of a material that hardens and expands in volume after absorbing water vapor from the air. Multiple capillary cracks are opened on the spherical core. By filling the filling units, the cable jacket can be temporarily repaired when it is damaged. This is suitable for use environments with low daily maintenance frequency and increases the power cable's tolerance to temperature differences.

[0014] Furthermore, the outer side of the core is covered with an elastic shell, and multiple through-holes are opened on the elastic shell. Multiple filling fibers are filled between the elastic shell and the core. The multiple filling fibers overlap to form a three-dimensional spatial structure. The elastic shell and filling fibers form a protective layer, making it less likely for the water absorption unit to absorb water prematurely and fail.

[0015] Furthermore, a connecting cable is fixedly connected to the outer wall of the elastic spherical shell. The end of the connecting cable away from the elastic spherical shell is fixedly connected to the outer wall of movable shell one or movable shell two, so that the filling unit is not easy to fall off directly from the cable sheath, and the filling unit can better perform the repair work.

[0016] Furthermore, multiple elastic support columns are fixedly connected between the elastic spherical shell and the core. These multiple elastic support columns are interwoven to maintain the overall structural shape of the filling unit, making it difficult for the elastic spherical shell and the core to directly adhere due to external forces, and thus less likely to affect the curing and expansion of the filling unit exposed from the cable sheath.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] When the temperature difference in the operating environment is large, the main body of the wire and the filling layer will undergo significant deformation. When the main body of the wire and the filling layer expand due to excessive temperature, the two movable shells of the adaptive enclosure will separate from each other. When the temperature drops and the volume of the main body of the wire and the filling layer returns to normal, the elastic outer shell and the first movable shell will re-merge under the action of multiple constraint rings. During the expansion and contraction of the main body of the wire and the filling layer, the first and second movable shells always adhere to the surface of the main body of the wire and the filling layer, always providing protection for the main body of the wire and the filling layer. The linkage design can drive the nearby constraint rings to deform under the action of the constraint rings of the locally deformed first and second movable shells during the deformation of the first and second movable shells. When there is excessive local deformation of the main body of the wire and the filling layer, the deformation of the first and second movable shells will be more uniform, and the phenomenon of damage caused by excessive local deformation of the first and second movable shells is less likely to occur.

[0019] Meanwhile, by filling the filling unit, the cable sheath can be temporarily repaired when it is damaged, preventing outside air and other debris from entering the working environment of the wire body and filling layer through the gap, thus further increasing the service life of the wire body and filling layer. It is suitable for use environments with low daily maintenance frequency and increases the power cable's tolerance to temperature differences. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the weather-resistant insulated low-voltage power cable structure in the first embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional schematic diagram of a weather-resistant insulated low-voltage power cable according to the first embodiment of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at point A;

[0023] Figure 4 This is a schematic diagram of the adaptive cover structure in the first embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional schematic diagram of a weather-resistant insulated low-voltage power cable according to the second embodiment of the present invention;

[0025] Figure 6 for Figure 5 Schematic diagram of the structure at point B;

[0026] Figure 7 This is a schematic diagram illustrating the structural changes when a gap appears in the cable sheath in the second embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the filling unit in the second embodiment of the present invention;

[0028] Figure 9 This is a cross-sectional view of the filling unit in the second embodiment of the present invention;

[0029] Figure 10 for Figure 9 A schematic diagram of the structure at point C.

[0030] Explanation of the labels in the diagram:

[0031] 1. Wire body, 2. Filling layer, 3. Elastic shell, 4. Movable shell I, 401. Fan-shaped shell I, 402. Matching fin I, 403. Constraint groove I, 5. Movable shell II, 501. Fan-shaped shell II, 502. Matching fin II, 503. Constraint groove II, 6. Constraint net, 7. Cable jacket, 8. Elastic fiber, 9. Constraint ring, 10. Linkage cable, 11. Filling unit, 1101. Elastic spherical shell, 1102. Spherical core, 1103. Water absorption unit, 1104. Capillary crack, 1105. Filling fiber, 1106. Elastic support column, 1107. Vent hole, 1108. Connecting cable, 12. Notch. Detailed Implementation

[0032] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0033] First implementation method:

[0034] Please see Figures 1-4 A weather-resistant insulated low-voltage power cable includes an elastic shell 3 and multiple wire bodies 1. The elastic shell 3 is sleeved on the outside of the multiple wire bodies 1. A filling layer 2 is filled between the elastic shell 3 and the multiple wire bodies 1. The filling layer 2 has the function of the insulation layer and shielding layer in the prior art. An adaptive cover is wrapped around the outside of the elastic shell 3. The adaptive cover includes a movable shell 4 and a movable shell 5 that match each other. A cable jacket 7 is sleeved on the outside of the adaptive cover. Multiple elastic fibers 8 are fixedly connected to the inner wall of the cable jacket 7. The multiple elastic fibers 8 are interlaced to form a spatial three-dimensional structure.

[0035] Movable shell 4 includes a fan-shaped outer shell 401, with mating fins 402 fixedly connected to both side walls of the fan-shaped outer shell 401. Multiple parallel constraint grooves 403 are formed inside the fan-shaped outer shell 401, extending to the inner wall of the mating fins 402. Movable shell 5 includes a fan-shaped outer shell 501 matching the size of the fan-shaped outer shell 401. Two mating fins 502 are fixedly connected to both side walls of the fan-shaped outer shell 501, with two mating fins 402 covering the outer sides of two mating fins 502. Multiple parallel constraint grooves 503 are provided inside, and all constraint grooves 503 extend to the outer wall of fin 502. Multiple positions match each other, and constraint grooves 403 and 503 cooperate to form a complete annular groove. Constraint rings 9 are inserted into the multiple annular grooves. A pair of linkage cables 10 are embedded in the fan-shaped outer shell 401 and the fan-shaped outer shell 501 respectively. The two linkage cables 10 are spiral and intertwined. The two linkage cables 10 are located on the upper and lower sides of the multiple constraint rings 9 respectively, and the intersection point of the two linkage cables 10 is located between two adjacent constraint rings 9.

[0036] In this application, the core components of the power cable are concentrated in the wire body 1 and the filling layer 2. This design is suitable for long-term projects of more than 3 years and non-high-temperature environments below 40 degrees Celsius. When there is a large temperature difference in the operating environment, the wire body 1 and the filling layer 2 will experience thermal expansion and contraction, resulting in significant deformation. When the wire body 1 and the filling layer 2 expand due to excessive temperature, the movable shell 4 and movable shell 5 of the adaptive enclosure will separate from each other. When the temperature decreases and the volume of the wire body 1 and the filling layer 2 returns to normal, under the action of multiple constraint rings 9, the elastic outer shell 3 and the movable shell 4 will re-merge. During the expansion and contraction of the main body 1 and the filling layer 2, the movable shell 1 4 and the movable shell 2 5 always adhere to the surface of the main body 1 and the filling layer 2, thus always protecting the main body 1 and the filling layer 2. The design of a pair of linkage cables 10 inside the movable shell 1 4 and the movable shell 2 5 can drive the nearby constraint ring 9 to deform under the action of the constraint ring 9 of 3 during the deformation of the movable shell 1 4 and the movable shell 2 5. When the main body 1 and the filling layer 2 deform excessively in some areas, the deformation of the movable shell 1 4 and the movable shell 2 5 will be more uniform, and it is less likely that the movable shell 1 4 and the movable shell 2 5 will be damaged due to excessive local deformation.

[0037] The design of the cable jacket 7 and the elastic fiber 8 provides a transition space for the shape changes of movable shell 1 4 and movable shell 2 5, making it less likely for external dust and other impurities to directly affect the connection between movable shell 1 4 and movable shell 2 5.

[0038] Movable shell 1 4 and movable shell 2 5 are made of elastic material, while linkage cable 10 is made of non-elastic material. Movable shell 1 4 and movable shell 2 5 made of elastic material are easier to fit the wire body 1 and filling layer 2, while linkage cable 10 made of non-elastic material has a better pulling effect on the adjacent constraint ring 9 when movable shell 1 4 and movable shell 2 5 deform.

[0039] The mating fins 402 and 502 are both frosted surfaces, which makes the mating fins 402 and 502 form a structure consistent with the labyrinth groove. Even if a small amount of dust or other debris passes through the cable jacket 7 and elastic fiber 8 and enters the self-adaptive cover, it will not easily affect the working environment of the wire body 1 and the filling layer 2.

[0040] The outer side of the adaptive cover is fitted with a constraint net 6, which is made of elastic thin rope and has an overall tendency to shrink inward. By using the constraint net 6 in conjunction with the linkage cable 10, the deformation of the movable shell 1 4 and the movable shell 2 5 as a whole is more gradual and less prone to excessive local deformation.

[0041] Second implementation method:

[0042] Please see Figures 5-10Multiple filling units 11 are filled between the active shell 2 5 and the cable jacket 7. Each filling unit 11 includes a spherical core 1102. The spherical core 1102 is filled with multiple water-absorbing units 1103. The water-absorbing units 1103 are materials that harden after absorbing water vapor in the air and expand in volume. Preferably, they are cured polyurethane prepolymers that can harden in a few minutes when exposed to water. Multiple capillary cracks 1104 are formed on the spherical core 1102.

[0043] Please see Figure 6 When a gap 12 appears on the surface of the cable sheath 7 due to wear, the deformation of the corresponding movable shell 4 and movable shell 5 will squeeze out some of the elastic fibers 8 from the gap 12, forming a barrier at the opening of the gap 12. This will prevent some air from the external environment from entering the cable sheath 7, making the working environment of the movable shell 4 and movable shell 5 less susceptible to external influences. However, a small amount of air will still enter the cable sheath 7. But due to the presence of the elastic fibers 8 inside the cable sheath 7, the impact on the movable shell 4 and movable shell 5 is relatively small. As the movable shell 4 and movable shell 2 continue to deform under the action of temperature difference, there is a probability that the filling unit 11 will be squeezed out from the gap 12. At this time, the filling unit 11 will be in direct contact with the outside. Water vapor in the outside air will act on the water absorption unit 1103, causing the water absorption unit 1103 to harden and expand. Even if the movable shell 4 and movable shell 2 recover later, the filling unit 11 cannot return to the cable sheath 7 under the pull of external force. Instead, it will block the gap 12 and complete the repair of the gap 12.

[0044] The outer side of the core 1102 is covered by an elastic spherical shell 1101. The elastic spherical shell 1101 has multiple through-holes 1107. Multiple filling fibers 1105 are filled between the elastic spherical shell 1101 and the core 1102. The multiple filling fibers 1105 overlap to form a three-dimensional spatial structure. The elastic spherical shell 1101 and the filling fibers 1105 form a protective layer. When the filling unit 11 is located inside the cable jacket 7, even if a small amount of air enters the cable jacket 7, it will not easily affect the water absorption unit 1103. Only when the filling unit 11 moves to the outside of the cable jacket 7 and comes into contact with a large amount of air will the water absorption unit 1103 harden and expand under the action of water vapor. The density of the filling fiber 1105 is much smaller than the density of the elastic fiber 8.

[0045] A connecting cable 1108 is fixedly connected to the outer wall of the elastic spherical shell 1101. The end of the connecting cable 1108 away from the elastic spherical shell 1101 is fixedly connected to the outer wall of the movable shell 4 or the movable shell 5, so that the filling unit 11 is not easy to fall off the cable jacket 7 directly, and the filling unit 11 can better play the role of repair work.

[0046] Multiple elastic support columns 1106 are fixedly connected between the elastic spherical shell 1101 and the spherical core 1102. The multiple elastic support columns 1106 are interwoven with each other. The elastic support columns 1106 maintain the overall structural shape of the filling unit 11, so that the elastic spherical shell 1101 and the spherical core 1102 are not easily attached directly by external force, and the curing expansion of the filling unit 11 exposed from the cable jacket 7 is not easily affected.

[0047] Compared to the first embodiment, in this embodiment, the filling unit 11 temporarily repairs the cable jacket 7 when it is damaged, preventing external air and other debris from entering the working environment of the wire body 1 and the filling layer 2 through the gap 12, thereby further increasing the service life of the wire body 1 and the filling layer 2. This is suitable for use environments with low daily maintenance frequency and increases the power cable's tolerance to temperature differences.

[0048] In particular, this application only discloses a partial structure of the weather-resistant insulated low-voltage power cable. Those skilled in the art can design the structure of movable shell 4 or movable shell 5 into a multi-segment structure based on the content disclosed in this application to facilitate production and transportation.

[0049] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A weather-resistant insulated low-voltage power cable, comprising an elastic outer shell (3) and a plurality of wire bodies (1), wherein the elastic outer shell (3) is sleeved on the outside of the plurality of wire bodies (1), and a filler layer (2) is filled between the elastic outer shell (3) and the plurality of wire bodies (1), characterized in that: The outer side of the elastic shell (3) is covered with an adaptive cover, which includes a matching movable shell one (4) and a movable shell two (5). The outer side of the adaptive cover is fitted with a cable jacket (7), and the inner wall of the cable jacket (7) is fixedly connected with multiple elastic fibers (8). The multiple elastic fibers (8) are interlocked to form a spatial three-dimensional structure. The movable shell one (4) includes a fan-shaped outer shell one (401), and mating fins one (402) are fixedly connected to both sides of the fan-shaped outer shell one (401). Multiple parallel constraint grooves one (403) are provided inside the fan-shaped outer shell one (401), and the multiple constraint grooves one (403) extend to the inner wall of the mating fins one (402). The movable shell two (5) includes a fan-shaped outer shell two (501) that matches the size of the fan-shaped outer shell one (401). Two mating fins two (502) are fixedly connected to both sides of the fan-shaped outer shell two (501), and two mating fins one (402) cover the outer sides of two mating fins two (502). The fan-shaped outer shell two (501)... 01) Multiple parallel constraint grooves (503) are provided inside. The multiple constraint grooves (503) extend to the outer wall of the fin (502). Multiple positions match each other. The constraint grooves (403) and constraint grooves (503) cooperate to form a complete annular groove. Constraint rings (9) are inserted in the multiple annular grooves. A pair of linkage cables (10) are embedded in the fan-shaped outer shell (401) and the fan-shaped outer shell (501). The two linkage cables (10) are spiral and intertwined. The two linkage cables (10) are located on the upper and lower sides of the multiple constraint rings (9), and the intersection point of the two linkage cables (10) is located between two adjacent constraint rings (9).

2. The weather-resistant insulated low-voltage power cable according to claim 1, characterized in that: The first movable shell (4) and the second movable shell (5) are made of elastic material, while the linkage cable (10) is made of non-elastic material.

3. The weather-resistant insulated low-voltage power cable according to claim 1, characterized in that: Both mating fin one (402) and mating fin two (502) have a frosted surface on their sides that are close to each other.

4. The weather-resistant insulated low-voltage power cable according to claim 1, characterized in that: The outer side of the adaptive cover is fitted with a constraint net (6), which is woven from elastic thin ropes and has an overall tendency to shrink inward.

5. A weather-resistant insulated low-voltage power cable according to claim 1, characterized in that: The space between the movable shell 2 (5) and the cable jacket (7) is filled with multiple filling units (11), each of the multiple filling units (11) including a sphere core (1102), and the sphere core (1102) is filled with multiple water-absorbing units (1103).

6. A weather-resistant insulated low-voltage power cable according to claim 5, characterized in that: The outer side of the core (1102) is covered by an elastic spherical shell (1101), and the elastic spherical shell (1101) has multiple through-holes (1107). Multiple filling fibers (1105) are filled between the elastic spherical shell (1101) and the core (1102), and the multiple filling fibers (1105) overlap each other to form a three-dimensional spatial structure.

7. A weather-resistant insulated low-voltage power cable according to claim 5, characterized in that: A connecting cable (1108) is fixedly connected to the outer wall of the elastic spherical shell (1101), and one end of the connecting cable (1108) away from the elastic spherical shell (1101) is fixedly connected to either the outer wall of the first movable shell (4) or the second movable shell (5).

8. A weather-resistant insulated low-voltage power cable according to claim 5, characterized in that: A plurality of elastic support columns (1106) are fixedly connected between the elastic spherical shell (1101) and the spherical core (1102), and the plurality of elastic support columns (1106) are interwoven with each other.

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