A composite overhead insulated cable

Abstract

The present invention discloses a composite overhead insulated cable, which relates to the field of insulated cable devices. The composite overhead insulated cable includes an insulating and heat-conducting layer, and a plurality of groups of power transmission conductors are arranged inside the insulating and heat-conducting layer. The power transmission conductors are stranded by a plurality of copper alloy wire cores, and a protection unit is arranged outside the insulating and heat-conducting layer. By arranging a positioning component inside the cable and respectively arranging a deformation limiting component and an extrusion buffering component at the positioning component, while positioning the plurality of groups of power transmission conductors through the positioning component, the effective extension of the cable under the conditions of torsion and extrusion force can be ensured respectively through the deformation limiting component and the extrusion buffering component, so that the limiting component and the anti-extrusion component do not affect each other, and the generated torsion force and extrusion force are buffered respectively, thereby improving the overall compressive resistance of the cable, ensuring the rebound effect of the cable, improving the overall flexibility of the cable, and increasing the service life of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of insulated cables, and particularly to a composite overhead insulated cable. Background Art

[0002] A composite overhead insulated cable is a cable used for overhead power transmission lines. It is a cable in which an insulating material is wrapped around a conductor and is composed of a combination of multiple materials or multiple structures. This cable combines the advantages of different materials and can effectively improve the performance of the cable, making it suitable for various complex overhead power transmission environments.

[0003] Since the usage environment of the cable is relatively complex, during use, it is necessary to ensure the overall flexibility and strength of the cable. The internal structure of the cable is complex and usually includes multiple conductors. These conductors may have different materials, diameters, and functions. When the cable is subjected to a large external extrusion force during use, at this time, although the external protective layer can provide certain protection, it cannot control the deformation range of the internal structure of the cable, making the internal structure easily suffer irreversible damage and reducing the service strength of the cable. Secondly, the insulating layer may be extruded and deformed, resulting in a decrease in insulating performance, and the internal conductors may undergo relative displacement, affecting the use effect of the conductors. In view of the deficiencies of the prior art, we propose a composite overhead insulated cable to solve the above problems. Summary of the Invention

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A composite overhead insulated cable includes an insulating and heat-conducting layer. Inside the insulating and heat-conducting layer, multiple groups of power transmission conductors are arranged. The power transmission conductors are stranded by multiple copper alloy wire cores. Outside the insulating and heat-conducting layer, a protection unit is provided. Inside the insulating and heat-conducting layer, a positioning component is provided. Multiple groups of the power transmission conductors are distributed inside the positioning component;

[0005] At the positioning component, a deformation limiting component and an extrusion buffering component are provided. The deformation limiting component is respectively installed on the tops of multiple groups of power transmission conductors. The deformation limiting component limits the torsion angle of the cable. The extrusion buffering component is installed on the top between adjacent two groups of power transmission conductors. The extrusion buffering component buffers the extrusion force generated by the cable;

[0006] On the top of the deformation limiting component, a support plate is provided. The support plate cooperates with the extrusion buffering component to improve the overall strength of the cable;

[0007] The deformation limiting component includes an arc-shaped cylinder, an arc-shaped column, a first limiting flap, a second limiting flap, a return spring and a limiting chute. The arc-shaped column is slidably connected inside the arc-shaped cylinder. The first limiting flap and the second limiting flap are respectively fixedly sleeved on the outer peripheral walls of the arc-shaped cylinder and the arc-shaped column. Two ends of the return spring are respectively fixedly connected to the inner walls of the arc-shaped cylinder and the arc-shaped column;

[0008] The extrusion buffering component includes an extrusion plate, a metal plate, bending grooves, buffer springs and reinforcing ribs. The bottom of the extrusion plate is respectively slidably connected inside multiple sets of support plates. The metal plates are fixedly installed on the top of the extrusion plate at equal intervals. The bending grooves are equally spaced on the top of the extrusion plate. Multiple sets of the bending grooves and the metal plates are distributed at equal intervals along the length of the extrusion plate. The metal plates and the bending grooves are arranged alternately;

[0009] The limiting chutes are opened on the outer walls on both sides of the extrusion plate. The positions of the extrusion plate and the limiting chutes correspond to the positions of the arc-shaped cylinder and the arc-shaped column. The mutually remote ends of the arc-shaped cylinder and the arc-shaped column are respectively slidably connected inside the limiting chutes of adjacent two sets of extrusion plates.

[0010] Preferably, the positioning component includes a mounting shaft and a positioning bracket. The mounting shaft is installed at the central position inside the cable. The positioning bracket is fixedly sleeved on the outer peripheral wall of the mounting shaft. The positioning bracket is composed of multiple sets of support plates. Multiple sets of the support plates are annularly and equally spaced on the outer peripheral wall of the mounting shaft. The insulating and heat-conducting layer is installed between adjacent two sets of support plates.

[0011] Preferably, the positioning bracket is made of deformable material. The deformation limiting components are installed between adjacent two sets of support plates. Multiple sets of the deformation limiting components are distributed at equal intervals along the length of the support plates. The deformation limiting components support adjacent two sets of support plates.

[0012] Preferably, the top of the buffer spring is fixedly connected to the bottom of the extrusion plate. The other end of the buffer spring is fixedly connected to the inner bottom of the support plate. The bottom of the extrusion plate is fixedly connected to the reinforcing rib. The reinforcing rib is located inside the buffer spring.

[0013] Preferably, the support plate is telescopically arranged. Two ends of the support plate are respectively fixedly connected to the first limiting flap and the second limiting flap. A clamping plate is clamped on the outer peripheral wall of the power transmission conductor. A support column is fixedly installed at the bottom of the clamping plate. The bottom of the support column is fixedly installed on the surface of the mounting shaft. Multiple sets of the support columns are annularly and equally spaced on the outer peripheral wall of the mounting shaft.

[0014] Preferably, the insulating and heat-conducting layer is composed of an inner sleeve and an outer sleeve. A flame retardant layer is wrapped between the inner sleeve and the outer sleeve. The inner peripheral wall of the inner sleeve is in contact with the tops of multiple sets of metal plates. Heat-conducting materials are filled in the gaps between the inner sleeve and multiple sets of power transmission conductors.

[0015] Preferably, the protection unit includes a threaded tube and a protective sleeve. The threaded tube is wrapped around the outer peripheral wall of the insulating and heat-conducting layer, and the protective sleeve is wrapped around the outer peripheral wall of the threaded tube. Heat-conducting columns are fixedly installed inside the protective sleeve, and multiple groups of the heat-conducting columns are evenly distributed in a ring at equal intervals, and heat dissipation channels are formed between adjacent two groups of heat-conducting columns.

[0016] The present invention discloses a composite overhead insulated cable, and the beneficial effects thereof are as follows:

[0017] 1. For this composite overhead insulated cable, by arranging a positioning component inside the cable and respectively arranging a deformation limiting component and a squeezing buffer component at the positioning component, while positioning multiple groups of power transmission conductors through the positioning component, the effective extension of the cable under the conditions of torsion and extrusion force can be ensured respectively through the deformation limiting component and the squeezing buffer component, so that the limiting component and the anti-extrusion component do not affect each other, and the generated torsion force and extrusion force are buffered respectively, thereby improving the overall compressive resistance of the cable, ensuring the rebound effect of the cable, and improving the overall flexibility and service life of the cable.

[0018] 2. For this composite overhead insulated cable, by evenly distributing multiple groups of support plates on the outer peripheral wall of the installation shaft and respectively installing multiple groups of power transmission conductors between adjacent two groups of support plates, the mechanical support for multiple groups of power transmission conductors can be respectively achieved, effectively preventing mutual extrusion and displacement between the power transmission conductors, keeping the power transmission conductors in relatively stable positions in space, fixing the power transmission conductors inside their respective areas, avoiding the disorder of the conductor structure caused by torsion, and at the same time avoiding the damage of the power transmission conductors caused by mechanical external force.

[0019] 3. For this composite overhead insulated cable, by installing a deformation limiting component between adjacent two groups of support plates, when the cable generates torsion, the arc-shaped column can be driven to slide inside the arc-shaped cylinder, and the internal reset spring is deformed, buffering the generated torsion force. When the torsion angle increases, the deformation of the support plate at the positioning bracket intensifies, and the distance between adjacent two groups of support plates gradually becomes smaller, so that the two limiting flanges come into contact and start to function, preventing further excessive deformation, ensuring that the relative positions of multiple groups of power transmission conductors do not change significantly, and the acting force generated during the torsion process does not squeeze the power transmission conductors, further improving the protection strength for multiple groups of power transmission conductors and ensuring the effective extension of the cable under the condition of torsion.

[0020] 4. The composite overhead insulated cable can effectively buffer the extrusion force generated by the cable by installing an extrusion buffer component on the top of the sub-board, and a bending groove is opened at the extrusion board, which is easy for the cable to be bent and laid. When the cable is excessively extruded externally, multiple groups of reinforcing ribs can support the extrusion board, enabling the extrusion board to provide a rigid support for the generated extrusion force. Moreover, when the extrusion board is extruded and slides inside the support board, the positions of multiple groups of deformation limiting components will not change. Furthermore, the generated extrusion force can be further rigidly supported by the support board, and the external extrusion force borne by the reinforcing ribs can be dispersed through the strength of the support board, further improving the overall compressive resistance of the cable. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the overall structure of the present invention;

[0023] Figure 2 Exploded structure diagram of the present invention;

[0024] Figure 3 Schematic diagram of the installation positions of the positioning component, deformation limiting component and extrusion buffer component of the present invention;

[0025] Figure 4 Side sectional view of the present invention;

[0026] Figure 5 Schematic diagram of the installation structure of the deformation limiting component and the extrusion board of the present invention;

[0027] Figure 6 Exploded structure diagram of the deformation limiting component of the present invention;

[0028] Figure 7 Exploded structure diagram of the extrusion board and the support board of the present invention;

[0029] Figure 8 Side sectional view of one side of the protection unit of the present invention;

[0030] Figure 9 Schematic diagram of the positioning component of the present invention.

[0031] In the figure: 1. Insulating and heat-conducting layer; 101. Inner sleeve; 102. Outer sleeve; 103. Flame-retardant layer;

[0032] 2. Transmission conductor; 201. Clamping plate; 202. Support column;

[0033] 3. Protection unit; 301. Threaded tube; 302. Protection sleeve; 3021. Heat conduction column; 3022. Heat dissipation channel;

[0034] 4. Positioning component; 401. Mounting shaft; 402. Positioning bracket; 4021. Support plate;

[0035] 5. Deformation limiting component; 501. Arc-shaped cylinder; 502. Arc-shaped column; 503. First limiting flap; 504. Second limiting flap; 505. Return spring; 506. Limiting chute;

[0036] 6. Extrusion buffer component; 601. Extrusion plate; 602. Metal plate; 603. Bending groove; 604. Buffer spring; 605. Reinforcing rib;

[0037] 7. Support plate; 8. Heat-conducting material. Specific embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0040] An embodiment of the present invention discloses a composite overhead insulated cable.

[0041] According to the attached Figures 1-9 As shown, it includes an insulating and heat-conducting layer 1. Inside the insulating and heat-conducting layer 1, multiple groups of transmission conductors 2 are arranged. The transmission conductors 2 are formed by stranding multiple copper alloy wire cores. Outside the insulating and heat-conducting layer 1, a protection unit 3 is arranged. Inside the insulating and heat-conducting layer 1, a positioning component 4 is arranged. Multiple groups of transmission conductors 2 are distributed inside the positioning component 4;

[0042] Specifically, a deformation limiting component 5 and an extrusion buffer component 6 are arranged at the positioning component 4. The deformation limiting component 5 is respectively installed on the tops of multiple groups of transmission conductors 2. The deformation limiting component 5 limits the torsional angle of the cable. The extrusion buffer component 6 is installed on the top between adjacent two groups of transmission conductors 2. The extrusion buffer component 6 buffers the extrusion force generated by the cable;

[0043] Specifically, a support plate 7 is provided at the top of the deformation limiting component 5. The support plate 7 cooperates with the extrusion buffer component 6 to improve the overall strength of the cable. When the extrusion force generated by the cable is relatively strong, through the cooperation of the extrusion buffer component 6, it can ensure that the position of the deformation limiting component 5 will not change. Furthermore, the generated extrusion force can be further rigidly supported by the support plate 7. The external extrusion force borne by the extrusion buffer component 6 is dispersed through the strength of the support plate 7, improving the overall compressive resistance and the overall strength of the cable.

[0044] Specifically, the deformation limiting component 5 includes an arc-shaped cylinder 501, an arc-shaped column 502, a first limiting flap 503, a second limiting flap 504, a return spring 505, and a limiting chute 506. The arc-shaped column 502 is slidably connected inside the arc-shaped cylinder 501. The first limiting flap 503 and the second limiting flap 504 are respectively fixedly sleeved on the outer peripheral walls of the arc-shaped cylinder 501 and the arc-shaped column 502. The two ends of the return spring 505 are respectively fixedly connected to the inner walls of the arc-shaped cylinder 501 and the arc-shaped column 502, gradually driving the two limiting flaps at the top of multiple groups of power transmission conductors 2 to slide closer to each other until the two limiting flaps come into contact. It should be noted that both of the two limiting flaps are made of metal materials, and the distance between the two limiting flaps can be adjusted according to the maximum torsional force borne by the power transmission conductor 2, so that the two limiting flaps come into contact with each other and prevent further torsion. This method can control the torsion limit of the cable and ensure that the internal structure of the cable will not be damaged due to excessive torsion.

[0045] Specifically, the extrusion buffer component 6 includes an extrusion plate 601, a metal plate 602, a bending groove 603, a buffer spring 604, and a reinforcing rib 605. By arranging the bending groove 603 and the deformation limiting component 5 in a staggered manner, when the cable is bent through the bending groove 603, the installed deformation limiting component 5 will not affect the bending of the cable, making the bending of the cable and the torsion limiting work of the cable independent of each other. The bottom of the extrusion plate 601 is slidably connected inside multiple groups of support plates 4021 respectively. The metal plates 602 are fixedly installed equidistantly on the top of the extrusion plate 601. The bending grooves 603 are equally spaced on the top of the extrusion plate 601. Multiple groups of bending grooves 603 and metal plates 602 are distributed equidistantly along the length of the extrusion plate 601. The metal plates 602 and the bending grooves 603 are arranged in a staggered manner. When the extrusion force generated by the cable does not exceed the bearing limit of the extrusion plate 601, the reinforcing rib 605 at the bottom of the extrusion plate 601 does not contact the support plate 4021. When it exceeds the bearing limit of the extrusion plate 601, the bottom of the reinforcing rib 605 contacts the support plate 4021, and the generated extrusion force is rigidly supported by the reinforcing rib 605 to prevent the internal power transmission conductor 2 from being directly extruded and deformed.

[0046] Specifically, the limiting sliding grooves 506 are formed on the outer walls on both sides of the extrusion plate 601. The positions of the extrusion plate 601 and the limiting sliding grooves 506 correspond to the positions of the arc-shaped cylinder 501 and the arc-shaped column 502. The mutually remote ends of the arc-shaped cylinder 501 and the arc-shaped column 502 are respectively slidably connected inside the limiting sliding grooves 506 of the adjacent two groups of extrusion plates 601. Before the cable is subjected to an external extrusion force, the positions of the arc-shaped cylinder 501 and the arc-shaped column 502 are located at the bottom of the limiting sliding grooves 506. At the same time, the reinforcing ribs 605 at the bottom of the extrusion plate 601 do not contact the bottom of the support plate 4021. For details, please refer to the attached Figure 3 and the attached Figure 7 . When the external extrusion force exceeds the bearing limit of the extrusion plate 601, the bottom of the reinforcing rib 605 contacts the support plate 4021. The arc-shaped cylinder 501 and the arc-shaped column 502 are located at the uppermost part of the limiting sliding grooves 506, so that the adjacent two groups of extrusion plates 601 slide between the arc-shaped cylinder 501 and the arc-shaped column 502, keeping the positions of the arc-shaped cylinder 501 and the arc-shaped column 502 unchanged. Furthermore, the support plate 7 at the top of the arc-shaped cylinder 501 and the arc-shaped column 502 can disperse the external extrusion force borne by the extrusion plate 601, improving the overall compressive resistance effect of the cable.

[0047] Specifically, the positioning assembly 4 includes a mounting shaft 401 and a positioning bracket 402. The mounting shaft 401 is installed at the central position inside the cable. The positioning bracket 402 is fixedly sleeved on the outer peripheral wall of the mounting shaft 401. The positioning bracket 402 is composed of multiple groups of support plates 4021. The multiple groups of support plates 4021 are annularly and equidistantly distributed on the outer peripheral wall of the mounting shaft 401. The insulating and heat-conducting layer 1 is installed between the adjacent two groups of support plates 4021.

[0048] Specifically, the positioning bracket 402 is made of a deformable material. The deformation limiting assembly 5 is installed between the adjacent two groups of support plates 4021. The multiple groups of deformation limiting assemblies 5 are equidistantly distributed along the length of the support plates 4021. The deformation limiting assembly 5 supports the adjacent two groups of support plates 4021. The positioning bracket 402 is set as a deformable material, such as elastic rubber or shape memory alloy. When the cable twists, the positioning bracket 402 can buffer the stress generated by the twist through its own deformation. It can be twisted and stretched like a spring, absorbing the twisting force and reducing the stress directly transmitted to the conductor. This stress buffering mechanism helps to protect the conductor and maintain its relative position to a certain extent.

[0049] Specifically, the top of the buffer spring 604 is fixedly connected to the bottom of the extrusion plate 601, and the other end of the buffer spring 604 is fixedly connected to the inner bottom of the support plate 4021. The bottom of the extrusion plate 601 is fixedly connected to the reinforcing rib 605, and the reinforcing rib 605 is located inside the buffer spring 604. When the cable is subjected to external extrusion force and torsional force, the extrusion plate 601 and the buffer spring 604 can effectively buffer the generated extrusion force. At the same time, the torsional force generated can be buffered by the return spring 505 inside the arc-shaped cylinder 501 and the arc-shaped column 502, respectively driving the buffer spring 604 and the return spring 505 to deform. When the external force disappears, through the action of the torsional force and the extrusion force respectively, the buffer spring 604 and the return spring 505 can ensure the cable's resilience effect through their own deformation, improving the overall flexibility of the cable.

[0050] Specifically, the support plate 7 is telescopically arranged, and both ends of the support plate 7 are fixedly connected to the first limit stop 503 and the second limit stop 504 respectively. A clamping plate 201 is clamped on the outer peripheral wall of the power transmission conductor 2, and the clamping plate 201 and the support column 202 clamp and support the power transmission conductor 2. The bottom of the clamping plate 201 is fixedly installed with a support column 202, and the bottom of the support column 202 is fixedly installed on the surface of the mounting shaft 401. Multiple groups of support columns 202 are annularly and equidistantly distributed on the outer peripheral wall of the mounting shaft 401. During the use of the cable, a bending operation needs to be performed. During the bending process, through the cooperation between the equidistantly arranged bending grooves 603 and the threaded pipe 301, it is convenient to perform the bending operation on the cable, making it easier for the cable to bend and being able to control the bending radius. By setting the bending grooves 603 at specific positions, damage to the internal wires of the cable during the bending process is avoided, allowing the cable to smoothly fit the corner or the shape of the equipment for bending, improving the use effect of the cable.

[0051] Specifically, the insulating and heat-conducting layer 1 is composed of an inner sleeve 101 and an outer sleeve 102. A flame-retardant layer 103 is wrapped between the inner sleeve 101 and the outer sleeve 102. The inner peripheral walls of the inner sleeve 101 are all in contact with the tops of multiple groups of metal plates 602. Heat-conducting materials 8 are filled in the gaps between the inner sleeve 101 and the multiple groups of power transmission conductors 2. The heat-conducting materials 8 are magnesium oxide powder, which is an excellent heat-conducting and insulating material. Filled between the multiple groups of power transmission conductors 2 and the outer layer of the cable, the magnesium oxide powder can quickly conduct the heat generated by the conductors, prevent heat from accumulating inside the cable, ensure that the heat is evenly dissipated, protect the insulating material of the cable from being damaged by high temperature, extend the service life of the cable, and the inner sleeve 101 can use a soft and highly resilient insulating material, such as silicone rubber, which can play a buffering role when the cable is twisted, reducing the stress on the outer insulating and heat-conducting layer 1. The outer sleeve 102 can adopt an insulating material with slightly higher hardness, strong abrasion resistance and puncture resistance, such as cross-linked polyethylene. Such a combination can effectively protect the internal structure of the outer sleeve 102, prevent gaps from appearing at the interface, and thus improve the insulation performance of the insulating and heat-conducting layer 1. At the same time, by setting the flame-retardant layer 103 between the inner sleeve 101 and the outer sleeve 102, the flame-retardant layer 103 can delay or prevent the flame from spreading longitudinally along the cable, that is, along the length direction of the cable, and transversely, that is, between different conductors and insulating layers inside the cable, through physical and chemical means, and can protect the power transmission conductors 2 inside the cable.

[0052] Specifically, the protection unit 3 includes a threaded tube 301 and a protective sleeve 302. The threaded tube 301 is wrapped around the outer peripheral wall of the insulating and heat-conducting layer 1, and the protective sleeve 302 is wrapped around the outer peripheral wall of the threaded tube 301. Heat-conducting columns 3021 are fixedly installed inside the protective sleeve 302. Multiple groups of heat-conducting columns 3021 are evenly distributed in a ring, and heat dissipation channels 3022 are formed between adjacent two groups of heat-conducting columns 3021. The heat-conducting columns 3021 are heat-conducting silica gel, which is a high heat-conducting and insulating material. It not only has good heat conduction performance but also can play a certain insulating role. After the conductors inside the cable generate heat, the heat will first be transferred to the surrounding insulating and heat-conducting layer 1 through the heat-conducting materials 8, and the heat-conducting columns 3021 can evenly distribute the heat in the heat dissipation channels 3022. It can fill the tiny gaps in the heat dissipation channels 3022 to ensure that heat does not accumulate locally, and thus comprehensively improve the heat dissipation effect during the use of the cable, ensure the normal use of multiple groups of power transmission conductors 2 inside the cable, and extend the service life of the cable.

[0053] In summary, during use, by installing multiple groups of power transmission conductors 2 inside the positioning bracket 402, the power transmission conductors 2 are fixed inside it. First, it can play a role in mechanical support, effectively preventing the mutual extrusion and displacement between the power transmission conductors 2, keeping the power transmission conductors 2 in a relatively stable position in space, thereby avoiding damage to the power transmission conductors 2 caused by mechanical external forces. When the cable body is subjected to an external torsional force, the generated force is first distributed to the positioning bracket 402, and the stress generated during the torsion process is buffered through the deformation of the positioning bracket 402 itself;

[0054] Furthermore, when the cable twists, the shear stress generated due to the torsional force acts on the support plate 4021 of the positioning bracket 402. This shear stress causes the support plate 4021 of the positioning bracket 402 to deform, and the angle between two adjacent support plates 4021 changes. Under the action of the torsional force, they will produce relative displacement, which can drive the arc-shaped column 502 between two adjacent support plates 4021 to slide inside the arc-shaped cylinder 501. When the torsion angle increases, the deformation of the support plate 4021 at the positioning bracket 402 intensifies, and the distance between two adjacent support plates 4021 gradually becomes smaller. The deformation limiting component 5 starts to function to prevent further excessive deformation, ensuring that the relative positions of multiple groups of power transmission conductors 2 do not change significantly, and the force generated during the torsion process does not cause extrusion to the power transmission conductors 2, further improving the protection strength for multiple groups of power transmission conductors 2 and ensuring the effective extension of the cable under torsion;

[0055] At the same time, when the cable is externally squeezed, causing deformation to the cable and extrusion to multiple groups of power transmission conductors 2 inside, the generated extrusion force can act on the extrusion buffer component 6. Through the extrusion buffer component 6, the extrusion force can be buffered. First, the generated force acts on the tops of multiple metal plates 602, causing the metal plates 602 to drive the extrusion plate 601 to slide inside the support plate 4021. At the same time, the buffer spring 604 inside can be deformed to effectively buffer the generated pressure. When the generated extrusion force is relatively strong, the reinforcing rib 605 at the bottom of the extrusion plate 601 contacts the inner bottom of the support plate 4021, thereby being able to control the extrusion limit and prevent the situation that excessive extrusion is likely to damage multiple groups of power transmission conductors 2. While ensuring the effective extension of the cable under extrusion, it can improve the overall compressive resistance of the cable;

[0056] It should be noted that when the cable is excessively squeezed externally, multiple groups of reinforcing ribs 605 can support the extrusion plate 601, enabling the extrusion plate 601 to rigidly support the generated extrusion force. Moreover, when the extrusion plate 601 is squeezed and slides inside the support plate 4021, the positions of the multiple groups of deformation limiting components 5 will not change. Furthermore, the generated extrusion force can be rigidly supported by the support plate 7, and the external extrusion force borne by the reinforcing ribs 605 can be dispersed through the strength of the support plate 7, further improving the overall compressive resistance of the cable.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A composite overhead insulated cable, comprising an insulating heat-conducting layer (1), wherein a plurality of groups of power transmission conductors (2) are arranged inside the insulating heat-conducting layer (1), wherein the power transmission conductors (2) are formed by twisting a plurality of copper alloy wire cores, and characterized in that: A protection unit (3) is arranged outside the insulating heat-conducting layer (1), a positioning component (4) is arranged inside the insulating heat-conducting layer (1), and a plurality of groups of power transmission conductors (2) are distributed inside the positioning component (4); The positioning assembly (4) is provided with a deformation limiting assembly (5) and an extrusion buffer assembly (6); the deformation limiting assembly (5) is respectively installed on the top of a plurality of groups of power transmission conductors (2); the deformation limiting assembly (5) limits the torsion angle of the cable; the extrusion buffer assembly (6) is installed on the top between two adjacent groups of power transmission conductors (2); the extrusion buffer assembly (6) buffers the extrusion force generated by the cable; A support plate (7) is provided on the top of the deformation limiting component (5), and the support plate (7) cooperates with the extrusion buffer component (6) to improve the overall strength of the cable; The deformation limiting assembly (5) comprises an arc-shaped cylinder (501), an arc-shaped column (502), a first limiting blocking piece (503), a second limiting blocking piece (504), a return spring (505) and a limiting sliding groove (506); the arc-shaped column (502) is slidably connected inside the arc-shaped cylinder (501); the first limiting blocking piece (503) and the second limiting blocking piece (504) are respectively fixedly sleeved on the outer peripheral walls of the arc-shaped cylinder (501) and the arc-shaped column (502); and the two ends of the return spring (505) are respectively fixedly connected to the inner walls of the arc-shaped cylinder (501) and the arc-shaped column (502); The extrusion buffer assembly (6) comprises an extrusion plate (601), a metal plate (602), a bending groove (603), a buffer spring (604) and a reinforcing rib (605); the bottom of the extrusion plate (601) is slidably connected to the inside of a plurality of groups of support plates (4021); the metal plate (602) is fixedly installed at an equal distance on the top of the extrusion plate (601); the bending grooves (603) are evenly arranged on the top of the extrusion plate (601); a plurality of groups of the bending grooves (603) and the metal plate (602) are evenly distributed along the length of the extrusion plate (601); and the metal plate (602) and the bending grooves (603) are arranged in a staggered manner; The limiting slide grooves (506) are provided on the outer walls of both sides of the extrusion plate (601); the positions of the extrusion plate (601) and the limiting slide grooves (506) correspond to the positions of the arc tube (501) and the arc column (502); the ends of the arc tube (501) and the arc column (502) that are away from each other are respectively slidably connected inside the limiting slide grooves (506) at two adjacent groups of extrusion plates (601).

2. A composite overhead insulated cable according to claim 1, characterized in that: The positioning assembly (4) comprises a mounting shaft (401) and a positioning bracket (402); the mounting shaft (401) is mounted at a central position inside the cable; the positioning bracket (402) is fixedly sleeved on an outer peripheral wall of the mounting shaft (401); the positioning bracket (402) is composed of a plurality of groups of support plates (4021); the plurality of groups of support plates (4021) are distributed in an annular shape and at equal intervals on the outer peripheral wall of the mounting shaft (401); and the insulating heat-conducting layer (1) is mounted between two adjacent groups of support plates (4021).

3. A composite overhead insulated cable according to claim 2, characterized in that: The positioning bracket (402) is made of a deformable material, the deformation limiting assembly (5) is installed between two adjacent groups of support plates (4021), and multiple groups of the deformation limiting assemblies (5) are equidistantly distributed along the length of the support plates (4021), and the deformation limiting assemblies (5) support the two adjacent groups of support plates (4021).

4. A composite overhead insulated cable according to claim 1, characterized in that: The top of the buffer spring (604) is fixedly connected to the bottom of the extrusion plate (601), the other end of the buffer spring (604) is fixedly connected to the inner bottom of the support plate (4021), the bottom of the extrusion plate (601) is fixedly connected to the reinforcing rib (605), and the reinforcing rib (605) is located inside the buffer spring (604).

5. A composite overhead insulated cable according to claim 1, characterized in that: The support plate (7) is retractable, and the two ends of the support plate (7) are respectively fixedly connected to the first limit baffle (503) and the second limit baffle (504), the outer peripheral wall of the power transmission conductor (2) is clamped with a clamping plate (201), the bottom of the clamping plate (201) is fixedly mounted with a support column (202), the bottom of the support column (202) is fixedly mounted on the surface of the installation shaft (401), and a plurality of groups of the support columns (202) are distributed in an annular manner and at equal distances on the outer peripheral wall of the installation shaft (401).

6. A composite overhead insulated cable according to claim 1, characterized in that: The insulating heat-conducting layer (1) is composed of an inner sleeve (101) and an outer sleeve (102); a flame-retardant layer (103) is wrapped between the inner sleeve (101) and the outer sleeve (102); the inner peripheral wall of the inner sleeve (101) is in contact with the top of the plurality of metal plates (602); and the gaps between the inner sleeve (101) and the plurality of power transmission conductors (2) are filled with heat-conducting material (8).

7. A composite overhead insulated cable according to claim 1, characterized in that: The protection unit (3) comprises a threaded tube (301) and a protection sleeve (302); the threaded tube (301) is wrapped around the outer peripheral wall of the insulating heat-conducting layer (1); the protection sleeve (302) is wrapped around the outer peripheral wall of the threaded tube (301); a heat-conducting column (3021) is fixedly installed inside the protection sleeve (302); a plurality of groups of the heat-conducting columns (3021) are distributed in an annular manner and at equal intervals, and a heat dissipation channel (3022) is formed between two adjacent groups of heat-conducting columns (3021).

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