Flame-retardant power cable with unit structure

Abstract

The invention belongs to the technical field of electric power, and discloses a flame-retardant power cable with a unit structure, which is provided with a cable core, a filling component and an outer sheath, and the cable core and the filling component are wrapped by the outer sheath; the cable core is composed of N unit structures, each unit structure comprises a unit shell and a first insulated wire, the cross section of each unit shell is prismatic, a similar parting line dividing the internal space into a first space and a second space which are congruent is arranged in each unit shell, and the first internal angle of each unit shell is 360 / N degrees; the unit shells are spliced to form a cable core of a regular N-pointed star, the filling components are spliced to form a regular N-polygon or a circle, and the outer edge of the outer sheath is a regular N-polygon or a circle. The first insulated wire is placed in the first space and the second space; the outer sheath is made of flame-retardant plastic, N is larger than or equal to 3, and N is a positive integer. The invention has the beneficial technical effects of better heat dissipation, lower cost, smaller size, less material consumption and higher space utilization rate, and a single unit structure can transmit one-phase or multi-phase power.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a flame-retardant power cable with a unit structure. Background Art

[0002] In the prior art, cables are usually made of multiple transmission lines with circular cross-sections twisted together or arranged in parallel, and then covered with a protective layer to form a cable body. The disadvantages of this method are: the efficiency of cable space utilization needs to be improved, and power supply cannot be provided in groups; moreover, they cannot support or align with each other, and an external protective layer is required.

[0003] Prior art CN118016352A discloses a star-shaped structure cable, which comprises an optical communication component, a power transmission line, an outer sheath and a frame component, wherein the optical communication component is composed of a light transmission component and a loose tube, the light transmission component is located in a cavity inside the loose tube, the power transmission line is composed of an electric conductor and an insulating layer, the insulating layer covers the electric conductor, and the frame component is assembled from n hook components; the characteristic is that the hook component is composed of a first wall body, a second wall body and a T-shaped component, the hook component is composed of one end of the first wall body, the second wall body and the T-shaped component connected together, the first wall body and the second wall body can rotate inward along a fixed position at one end, and the T-shaped component is located at the first wall body. The angle between the first wall and the second wall is 180 degrees - 720 / n degrees. The T-shaped component is composed of a vertical body and a horizontal body that are perpendicular to each other. The other end of the vertical body is connected to the center of the upper surface of the horizontal body. The two ends of the horizontal body are respectively in close contact with the inner walls of the first wall and the second wall. The length of the second wall / the length of the first wall is equal to 1 + 2sin (90 / n). In the clockwise direction, the other end of the first wall of the previous curved hook component abuts against the outer wall of the second wall of the current curved hook component, and the other end of the second wall of the current curved hook component abuts against the inner wall of the second wall of the previous curved hook component. The previous curved hook component and the current curved hook component form a closed inner cavity, all the curved hook components form a regular n-pointed star, a part of the second wall of all the curved hook components forms a regular n-gonal central cavity, and among adjacent curved hook components, the external space surrounded by the current curved hook component and the previous curved hook component is the outer cavity; the optical communication component is located in the central cavity, the transmission line is located in the inner cavity, the outer sheath is covered outside the frame component, the outer edge of the outer sheath is a regular n-gon, n≥5, n is a positive integer; there is a triangular prism-shaped transmission component in the outer cavity, the transmission component is composed of an insulating shell and a conductive component located inside the insulating shell, the insulating shell is in contact with the wall forming the outer cavity, and the other side of the insulating shell is a plane and in contact with the inner wall of the outer sheath.

[0004] Although the above structures can restrain each other, the central space after the combination is not reasonably utilized, and the convenience of assembling and removing the conductors still needs to be improved. Summary of the invention

[0005] To solve the above problems, the purpose of the present invention is to disclose a flame-retardant power cable with a unit structure, which is achieved by adopting the following technical solutions.

[0006] A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; the characteristics are as follows: the cable core is composed of N unit structures, the unit structure comprises a unit shell, a first insulating wire, the cross section of the unit shell is prismatic, the interior of the unit shell has a quasi-dividing line passing through the center point, the quasi-dividing line divides the internal space of the unit shell into a first space and a second space that are congruent, and the first internal angle of the unit shell is 360 / N degrees; the shape of the outer edge of the first insulating wire matches the shape of the first space; the first inner angle of each ... Both sides of an inner angle are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are assembled to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, and the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filled outer edges of all the filling components are assembled to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the first insulating wire is placed in the first space and the second space, N≥3, and N is a positive integer.

[0007] A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; the characteristics are as follows: the cable core is composed of N unit structures, the unit structure comprises a unit shell, a first insulating wire, the cross section of the unit shell is prismatic, the interior of the unit shell has a first dividing line and a second dividing line, the first dividing line and the second dividing line divide the interior of the unit shell into a first space, a second space, and a third space that are congruent; the first internal angle of the unit shell is 360 / N degrees; the shape of the outer edge of the first insulating wire matches the shape of the first space; each unit shell The two sides of the first inner angle are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are pieced together to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, and the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filled outer edges of all the filling components are pieced together to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the first insulating wire is placed in the first space, the second space and the third space, N≥3, and N is a positive integer.

[0008] A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; the characteristics are as follows: the cable core is composed of N unit structures, the unit structure comprises a unit shell, a first insulating wire, and a second insulating wire, the cross section of the unit shell is an inclined, inverted concave shape, the first insulating wire is placed in the cavity inside the concave shape, the second insulating wire is placed in the groove of the concave shape, the shape of the first insulating wire matches the shape of the cavity inside the concave shape, the shape of the second insulating wire matches the shape of the groove of the concave shape, the first inner angle of the unit shell is 360 / N degrees; the filling component is formed by a first inclined side , a second inclined side, and a filling outer edge, the first inclined side and the second inclined side are both straight segments and have equal lengths; the two sides of the first inner angle of each unit shell are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are pieced together to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges of all the filling components are pieced together to form a regular N-gon or circle, the outer edge of the outer sheath is a regular N-gon or circle, N≥3, and N is a positive integer.

[0009] A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; the characteristics are as follows: the cable core is composed of N unit structures, the unit structure comprises a unit shell, a first insulating wire, the cross section of the unit shell is an inclined, inverted concave shape, the first insulating wire is placed in the cavity inside the concave shape, the shape of the first insulating wire matches the shape of the cavity inside the concave shape, the first inner angle of the unit shell is 360 / N degrees, one side of the first inner angle of the unit shell has a first opening communicating with the cavity inside the concave shape, the other side of the first inner angle of the unit shell has a concave groove, the first opening has a protruding second insulation outer layer, the second insulation outer layer has a second conductor, The second conductor is connected to the first conductor in the first insulating wire as a whole, the shape of the second insulation outer layer matches the shape of the concave groove, the second insulation outer layer of each unit structure is located in the groove of the adjacent unit structure, the filling component is composed of a first inclined side, a second inclined side, and a filling outer edge, the first inclined side and the second inclined side are straight line segments and have equal lengths; the two sides of the first inner angle of each unit shell are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are pieced together to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges of all the filling components are pieced together to form a regular N-gon or circle, the outer edge of the outer sheath is a regular N-gon or circle, N≥3, N is a positive integer.

[0010] In the flame-retardant power cable with a unit structure described above, the outer sheath is made of flame-retardant plastic.

[0011] The present application has the following major beneficial technical effects: better heat dissipation, lower cost, smaller size, less material consumption, a single unit structure can transmit one-phase or multi-phase power, and higher space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the cross-sectional structure of implementation example 1.

[0013] Figure 2 for Figure 1 Schematic diagram of the cable core structure.

[0014] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the unit structure used in the present invention after removing the first insulating line.

[0015] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the first insulating wire used in.

[0016] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure of the second insulating wire used in.

[0017] Figure 6 Schematic diagram of the cross-sectional structure of the filling component used in Implementation Example 1 and Implementation Example 2.

[0018] Figure 7 This is a schematic diagram of the cross-sectional structure of implementation example 3.

[0019] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the unit structure used in the present invention after removing the first insulating line.

[0020] Fig. 9 for Figure 7 Schematic diagram of the cross-sectional structure of the first insulating wire used in.

[0021] Fig.10 This is a schematic diagram of the cross-sectional structure of the unit shell used in Example 4 when it is not divided.

[0022] Fig.11 This is a schematic diagram of the cross-sectional structure of a unit shell used in implementation example 4.

[0023] Fig.12 This is a schematic diagram of the cross-sectional structure of another unit shell used in implementation example 4.

[0024] Fig.13 This is a schematic diagram of the cross-sectional structure of another unit shell used in Example 4.

[0025] Fig.14 This is a schematic diagram of the cross-sectional structure of the unit shell used in Example 5. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand and implement this patent, the marks in the drawings are now described in detail in conjunction with the drawings in the specification.

[0027] In the figure: 1-unit structure, 2-first insulating wire, 3-second insulating wire, 4-filling component, 5-outer sheath, 11-first horizontal side, 12-first hypotenuse, 13-second horizontal side, 14-second hypotenuse, 15-first diagonal line, 16-second diagonal line, 17-first type of dividing line, 18-second type of dividing line, 19-center point, 110-first cavity, 120-second cavity, 130-third cavity, 140-fourth cavity, 121-first inner hypotenuse, 141-second inner hypotenuse, 171-first dividing line Line, 172—second dividing line, 181—third type dividing line, 1400—first opening, 20—first inner cavity, 21—first insulation outer layer, 22—first conductor, 211—first horizontal insulating layer, 212—first inclined insulating layer, 213—second inclined insulating layer, 31—second insulation outer layer, 32—second conductor, 41—first inclined edge, 42—second inclined edge, 43—filling outer edge, θ—first inner angle of the unit shell, S101—first space, S102—second space, S103—third space.

[0028] Implementation Example 1: Please see Figures 1 to 6 A flame-retardant power cable with a unit structure comprises a cable core, a filling component 4, and an outer sheath 5, wherein the filling component is located in the outer gap of the cable core, and the outer sheath covers the cable core and the filling component as a whole; the characteristics are: The cable core is composed of six unit structures 1, and the unit structure 1 is composed of a unit shell, a first insulating wire 2, and a second insulating wire 3; The cross section of the unit shell is composed of a first transverse side 11, a first hypotenuse 12, a second transverse side 13, a second hypotenuse 14, a first inner hypotenuse 121, a second inner hypotenuse 141, and a third transverse side. The first transverse side is parallel to the second transverse side, the first hypotenuse is parallel to the second hypotenuse, the third transverse side is parallel to the first transverse side, the first inner hypotenuse is parallel to the second inner hypotenuse, the first inner hypotenuse is parallel to the first hypotenuse, the second inner hypotenuse is close to the second hypotenuse, the first inner hypotenuse is close to the first hypotenuse, the third transverse side is close to the first transverse side, one end of the third transverse side is connected to the other end of the second inner hypotenuse, the other end of the third transverse side is connected to the other end of the first inner hypotenuse, one end of the first inner hypotenuse is connected to the middle section of the second transverse side, and one end of the second inner hypotenuse is connected to the middle section of the second transverse side. A third cavity 130 is formed between one end of the first inner bevel and one end of the second inner bevel, a fourth cavity 140 is formed between the second bevel and the second inner bevel, a second cavity 120 is formed between the first inner bevel and the first bevel, a first cavity 110 is formed between the second transverse side and the third transverse side, one end of the first cavity 110 is communicated with one end of the third cavity 130, and the other end of the first cavity 110 is communicated with one end of the second cavity 120, and the outer edge of the cross section of the unit shell is a prismatic shape with a notch; The first insulating line 2 is composed of a first insulating outer layer 21 and a first conductor 22 located inside the first insulating outer layer. The first insulating outer layer is composed of a first horizontal insulating layer 211 located outside, a first inclined insulating layer 212, a second inclined insulating layer 213, a second horizontal insulating layer, and a third inclined insulating layer, a fourth inclined insulating layer, and a third horizontal insulating layer located inside. The first horizontal insulating layer, the second horizontal insulating layer, and the third horizontal insulating layer are parallel, and the third horizontal insulating layer is close to the first horizontal insulating layer. The first inclined insulating layer, the second inclined insulating layer, the third inclined insulating layer, and the fourth inclined insulating layer are parallel. The third inclined insulating layer is close to the first inclined insulating layer, and the fourth inclined insulating layer is close to the second horizontal insulating layer. A first inner cavity 20 is formed between the third inclined insulating layer and the fourth inclined insulating layer. A first conductor cavity is formed inside the first insulating outer layer. The first cavity 110, the second cavity 120, and the fourth cavity 140 form a combined cavity. The shape of the outer edge of the first insulating outer layer matches the shape of the combined cavity, and the first conductor is located in the first conductor cavity. The second insulating wire 3 is composed of a second insulating outer layer 31 and a second conductor 32. The second conductor 32 is located inside the second insulating outer layer 31. The shape of the outer edge of the second insulating outer layer matches the shape of the third cavity 130. The first insulating wire 2 is located in the combined cavity, the second insulating wire 3 is located in the third cavity 130, and the first inner bevel, the second inner bevel, and the third horizontal edge are located in the first inner cavity 20; The filling component 4 is composed of a first inclined edge 41, a second inclined edge 42, and a filling outer edge 43. The first inclined edge 41 and the second inclined edge 42 are both straight line segments with equal lengths. The filling outer edge 43 is a straight line segment. The outer edge shape of the filling component 4 is an isosceles triangle. Both sides of a vertex of each unit structure 1 are aligned with and tightly attached to one side of a vertex of an adjacent unit structure 1. All unit structures 1 are assembled to form a regular hexagonal cable core. There is a filling component 4 in the outer gap between two adjacent unit structures 1. The first inclined side 41 and the second inclined side 42 of the filling component 4 are respectively aligned with and tightly attached to the first horizontal side 11 or the first oblique side 12 of the adjacent unit structure 1; the filling outer edges 43 of all the filling components 4 are assembled to form a regular hexagon. The outer sheath covers the cable core and the filling components as a whole, and the outer edge of the outer sheath is a regular hexagon.

[0029] Implementation Example 2: Please see Figure 6 , and refer to Figures 1 to 5 A flame-retardant power cable with a unit structure is basically the same as embodiment 1, except that: the filling outer edge 43 is arc-shaped, preferably circular arc-shaped, so that the filling outer edges 43 of all filling components 4 are pieced together to form a circle, and the outer sheath covers the cable core and the filling components as a whole, and the outer edge of the outer sheath is circular.

[0030] Implementation Example 3: Please see Figures 7 to 9 , and refer to Figures 1 to 6 , a flame-retardant power cable with a unit structure, which is basically the same as the embodiment 1, except that: the second oblique side 14 has a first opening 1400; the second inclined insulating layer 213 has an outwardly extending end, the extending end forms a second insulating outer layer 31, the second insulating outer layer 31 has a second conductor 32, and the second conductor 32 is connected to the first conductor 31 as a whole; in each unit structure 1: the first insulating wire 2 is located in the combined cavity, and the second insulating outer layer 31 is located in the third cavity 130 of an adjacent unit structure 1.

[0031] Implementation Example 4: Please see Figures 10 to 13 , and refer to Figures 1 to 9 , a flame-retardant power cable with a unit structure, which is basically the same as the embodiment 1, except that: it only has a first insulating wire and does not have a second insulating wire; The outer edge of the cross section of the unit shell is a prismatic shape without a notch, the first diagonal line 15 and the second diagonal line 16 of the unit shell intersect at a center point 19, and the angle between the second horizontal side 13 and the second oblique side 14 of the unit shell is the first internal angle θ of the unit shell; The interior of the unit shell has a first type of dividing line 17 passing through the center point 19 and intersecting the first horizontal side 11 and the second horizontal side 13 at both ends, and the first type of dividing line 17 is a straight line segment; or, the interior of the unit shell has a second type of dividing line 18 passing through the center point 19 and intersecting the first hypotenuse 12 and the second hypotenuse 14 at both ends, and the second type of dividing line 18 is a straight line segment; or, the interior of the unit shell has a third type of dividing line 181 passing through the center point 19, and the third type of dividing line 181 is a curved line segment; the first type of dividing line 171, the second type of dividing line 18, and the third type of dividing line 181 are collectively referred to as class dividing lines, and the class dividing lines divide the internal space of the unit shell into congruent first spaces S101 and second spaces S102; The shape of the outer edge of the first insulating line matches the shape of the first space S101; The two sides of the first inner angle of each unit shell are aligned with and closely attached to one side of the first inner angle of an adjacent unit shell, and all the unit shells are assembled to form a regular hexagonal cable core, and there is a filling component 4 in the outer gap of two adjacent unit shells, and the first inclined side 41 and the second inclined side 42 of the filling component 4 are respectively aligned with and closely attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges 43 of all the filling components 4 are assembled to form a regular hexagon, and the outer sheath covers the cable core and the filling components as a whole, and the outer edge of the outer sheath is a regular hexagon; The first insulating wire is placed in the first space S101 and the second space S102.

[0032] Implementation Example 5: Please see Fig.14 , and refer to Figures 1 to 13 , a flame-retardant power cable with a unit structure, which is basically the same as a part of embodiment 4, except that: the first dividing line 171 and the second dividing line 172 are located inside the unit shell, and the first dividing line 171 and the second dividing line 172 divide the inside of the unit shell into a first space S101, a second space S102, and a third space S103; the first space S101, the second space S102, and the third space S103 are congruent.

[0033] The first insulating wire is placed in the first space S101 , the second space S102 , and the third space S103 .

[0034] In the present application, the unit structures 1 in the cable core are not limited to six, and can also be other multiples of not less than three, referred to as N. In this way, the cable core forming a regular N-pointed star and the filling outer edge 43 of the filling component 4 are pieced together to form a regular N-gon, and the outer sheath covers the cable core and the filling component as a whole, and the outer edge of the outer sheath is a regular N-gon.

[0035] In this application, the structure of implementation example 2 can be used in any other implementation example.

[0036] The flame-retardant power cable with a unit structure described in the present application is characterized in that: the material of the unit shell is plastic; and the unit shell is an integrated structure.

[0037] The flame-retardant power cable with a unit structure described in the present application is characterized in that the outer layer of the first insulation is an integrated structure.

[0038] The flame-retardant power cable with a unit structure described in the present application is characterized in that the material of the outer layer of the first insulation is plastic.

[0039] The flame-retardant power cable with a unit structure described in the present application is characterized in that the material of the outer layer of the second insulation is plastic.

[0040] The flame-retardant power cable with a unit structure described in the present application is characterized in that the outer layer of the second insulation is an integrated structure.

[0041] The shape matching described in this application refers to similarity.

[0042] In the present application, the cross-sectional shape of the second edge insulation outer layer is a parallelogram, and the shape of the groove is also a parallelogram. When the second edge insulation outer layer is in the groove, the second edge insulation outer layer does not extend out of the groove.

[0043] The filling component in the present application can be solid or foamed, and the material is preferably plastic.

[0044] In the present application, the first conductor may be woven into a corresponding shape, or may be cast or stretched into a corresponding shape; similarly, the first conductor may be woven into a corresponding shape, or may be cast or stretched into a corresponding shape.

[0045] In the present application, the straight line segment passing through the center point divides the space inside the unit shell equally. Of course, when it is a curve, it can also be divided equally as long as certain conditions are met; parallelism allows two first insulated wires to be placed in the same unit shell, so that single-phase power can be transmitted; in implementation example 5, the first and second dividing lines divide the space inside the unit shell into three spaces, so that three first insulated wires can be placed, so that three-phase power can be transmitted. Multiple unit structures realize the supply of multiple power channels and solve the problem of separate power access in the community.

[0046] In the first implementation example of the present application, the cross-sectional areas of the first and second insulating wires in each unit structure are different, while the first insulating wires are the same between the unit structures, and similarly, the second insulating wires are the same. This method is suitable for cable access to a uniformly standardized meter area to meet the needs of users with different power capacities. For example, users with smaller power capacities use the second insulating wire, and vice versa, the first insulating wire is used, thereby achieving the purpose of flexible power capacity supply. Moreover, the width of the groove can be set and produced according to demand, and preferably, the groove is parallel to the first hypotenuse.

[0047] In the present application, the second insulating outer layer in the second embodiment is cleverly arranged in the adjacent unit shell, so that when no filling parts or outer sheath are required, it can also form a whole and will not fall apart after assembly, thereby achieving the purpose of better heat dissipation, lower cost, smaller size and less material consumption.

[0048] In the present application, the first inner angle of the unit shell can be set according to requirements, as long as N unit structures can be assembled into a circle.

[0049] In addition, in the present application, a single unit structure can transmit one-phase or multi-phase power. Compared with the prior art, the space utilization rate is higher, the disassembly and assembly are more convenient, and the conductors are easy to remove during construction, so the construction speed is faster.

[0050] The present application has the following major beneficial technical effects: better heat dissipation, lower cost, smaller size, less material consumption, a single unit structure can transmit one-phase or multi-phase power, and higher space utilization.

[0051] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; characterized in that: The cable core is composed of N unit structures, and the unit structure includes a unit shell and a first insulating wire. The cross section of the unit shell is prismatic, and the interior of the unit shell has a quasi-dividing line passing through the center point, which divides the internal space of the unit shell into a first space and a second space that are congruent, and the first internal angle of the unit shell is 360 / N degrees; the shape of the outer edge of the first insulating wire matches the shape of the first space; the two sides of the first internal angle of each unit shell are respectively aligned with and tightly attached to one side of the first internal angle of an adjacent unit shell, and all the unit shells are pieced together to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, and the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first internal angle of the adjacent unit shell; the filling outer edges of all the filling components are pieced together to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the first insulating wire is placed in the first space and the second space; the outer sheath is flame-retardant plastic, N≥3, and N is a positive integer.

2. A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; characterized in that: The cable core is composed of N unit structures, and the unit structure includes a unit shell and a first insulating wire. The cross section of the unit shell is prismatic, and the interior of the unit shell has a first dividing line and a second dividing line, and the first dividing line and the second dividing line divide the interior of the unit shell into a first space, a second space, and a third space that are congruent; the first inner angle of the unit shell is 360 / N degrees; the shape of the outer edge of the first insulating wire matches the shape of the first space; the two sides of the first inner angle of each unit shell are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, and all the unit shells are assembled to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, and the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges of all the filling components are assembled to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the first insulating wire is placed in the first space, the second space, and the third space; the outer sheath is flame-retardant plastic, N≥3, and N is a positive integer.

3. A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; characterized in that: The cable core is composed of N unit structures, the unit structure includes a unit shell, a first insulating wire, and a second insulating wire. The cross section of the unit shell is an inclined, inverted concave shape. The first insulating wire is placed in the cavity inside the concave shape, and the second insulating wire is placed in the groove of the concave shape. The shape of the first insulating wire matches the shape of the cavity inside the concave shape, and the shape of the second insulating wire matches the shape of the groove of the concave shape. The first inner angle of the unit shell is 360 / N degrees; the filling component is composed of a first inclined side, a second inclined side, and a filling outer edge. The first inclined side and the second inclined side are both straight line segments and are long The two sides of the first inner angle of each unit shell are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are assembled to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, and the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges of all the filling components are assembled to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the outer sheath is flame-retardant plastic, N≥3, and N is a positive integer.

4. A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the outer sheath covers the cable core and the filling component as a whole; characterized in that: The cable core is composed of N unit structures, and the unit structure includes a unit shell and a first insulating wire. The cross section of the unit shell is an inclined, inverted concave shape. The first insulating wire is placed in the cavity inside the concave shape. The shape of the first insulating wire matches the shape of the cavity inside the concave shape. The first inner angle of the unit shell is 360 / N degrees. One side of the first inner angle of the unit shell has a first opening communicating with the cavity inside the concave shape. The other side of the first inner angle of the unit shell has a concave groove. The first opening has a protruding second insulation outer layer, and the second insulation outer layer has a second conductor. The second conductor is connected to the first conductor in the first insulating wire as a whole, the shape of the second insulation outer layer matches the shape of the concave groove, the second insulation outer layer of each unit structure is located in the groove of the adjacent unit structure, the filling component is composed of a first inclined side, a second inclined side, and a filling outer edge, the first inclined side and the second inclined side are straight line segments and have equal lengths; the two sides of the first inner angle of each unit shell are respectively aligned with and tightly attached to one side of the first inner angle of an adjacent unit shell, all the unit shells are pieced together to form a cable core of a regular N-pointed star, and there is a filling component in the outer gap of two adjacent unit shells, the first inclined side and the second inclined side of each filling component are respectively aligned with and tightly attached to one side of another first inner angle of the adjacent unit shell; the filling outer edges of all the filling components are pieced together to form a regular N-gon or circle, and the outer edge of the outer sheath is a regular N-gon or circle; the outer sheath is flame-retardant plastic, N≥3, N is a positive integer.

5. A flame-retardant power cable with a unit structure, comprising a cable core, a filling component, and an outer sheath, wherein the filling component is located in the outer gap of the cable core, and the outer sheath covers the cable core and the filling component as a whole; characterized in that: The cable core is composed of six unit structures, and the unit structure is composed of a unit shell, a first insulating wire, and a second insulating wire; the cross section of the unit shell is composed of a first transverse side, a first hypotenuse, a second transverse side, a second hypotenuse, a first inner hypotenuse, a second inner hypotenuse, and a third transverse side, the first transverse side is parallel to the second transverse side, the first hypotenuse is parallel to the second hypotenuse, the third transverse side is parallel to the first transverse side, the first inner hypotenuse is parallel to the second inner hypotenuse, the first inner hypotenuse is parallel to the first hypotenuse, the second inner hypotenuse is close to the second hypotenuse, the first inner hypotenuse is close to the first hypotenuse, the third transverse side is close to the first transverse side, one end of the third transverse side is connected to the other end of the second inner hypotenuse, the other end of the third transverse side is connected to the other end of the first inner hypotenuse, one end of the first inner hypotenuse is connected to the middle section of the second transverse side, and one end of the second inner hypotenuse is connected to the middle section of the second transverse side. A third cavity is formed between one end of the first inner bevel and one end of the second inner bevel, a fourth cavity is formed between the second bevel and the second inner bevel, a second cavity is formed between the first inner bevel and the first bevel, a first cavity is formed between the second transverse side and the third transverse side, one end of the first cavity is communicated with one end of the third cavity, the other end of the first cavity is communicated with one end of the second cavity, the outer edge of the cross section of the unit shell is a prism shape with a notch; the first insulating line is composed of a first insulation outer layer and a first conductor located inside the first insulation outer layer, the first insulation outer layer is composed of a first horizontal insulation layer located outside, a first inclined insulation layer, a second inclined insulation layer, a second horizontal insulation layer, and a third inclined insulation layer, a fourth inclined insulation layer, and a third horizontal insulation layer located inside, the first horizontal insulation layer, the second horizontal insulation layer, and the third horizontal insulation layer are parallel to each other, and the third horizontal insulation layer is parallel to the first horizontal insulation layer. The first inclined insulating layer, the second inclined insulating layer, the third inclined insulating layer and the fourth inclined insulating layer are parallel to each other, the third inclined insulating layer is close to the first inclined insulating layer, the fourth inclined insulating layer is close to the second horizontal insulating layer, a first inner cavity is formed between the third inclined insulating layer and the fourth inclined insulating layer, a first conductor cavity is formed inside the first insulation outer layer, the first cavity, the second cavity and the fourth cavity form a combined cavity, the shape of the outer edge of the first insulation outer layer matches the shape of the combined cavity, and the first conductor is located in the first conductor cavity; the second insulating wire is composed of the second insulation outer layer and the second conductor, the second conductor is located inside the second insulation outer layer, and the shape of the outer edge of the second insulation outer layer matches the shape of the third cavity; the first insulating wire is located in the combined cavity, the second insulating wire is located in the third cavity, the first inner hypotenuse, the second inner hypotenuse and the third horizontal edge are located in the first inner cavity; the filling component is composed of the first inclined edge, the second inclined edge and the filling outer edge, the first inclined edge and the second inclined edge are both straight line segments with equal lengths, the filling outer edge is a straight line segment, and the outer edge shape of the filling component is an isosceles triangle;The two sides of a vertex of each unit structure are aligned and closely attached to one side of a vertex of an adjacent unit structure. All unit structures are assembled to form a regular hexagonal cable core. There is a filling component in the outer gap of two adjacent unit structures. The first inclined side and the second inclined side of the filling component are respectively aligned and closely attached to the first horizontal side or the first oblique side of the adjacent unit structure; the filling outer edges of all filling components are assembled to form a regular hexagon or circle, and the outer edge of the outer sheath is a corresponding regular hexagon or circle; the outer sheath is flame-retardant plastic. ; 6. The flame-retardant power cable with a unit structure according to claim 5, characterized in that: The second oblique side has a first opening; the second inclined insulating layer has an outwardly extending end, the extending end forms a second insulating outer layer, the second insulating outer layer has a second conductor, and the second conductor is connected to the first conductor as a whole; in each unit structure: the first insulating wire is located in the combined cavity, and the second insulating outer layer is located in the third cavity of an adjacent unit structure.

7. The flame-retardant power cable with a unit structure according to claim 6, characterized in that: The first insulation outer layer is an integrated structure, and the material of the first insulation outer layer is plastic.

8. The flame-retardant power cable with a unit structure according to claim 7, characterized in that: The material of the outer layer of the second insulation is plastic.

9. The flame-retardant power cable with a unit structure according to claim 8, characterized in that: The outer layer of the second edge is an integrated structure.

10. A flame-retardant power cable with a unit structure according to any one of claims 1 to 5, characterized in that: The material of the unit housing is plastic; the unit housing is a one-piece structure.

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