CN221225892U

CN221225892U - Cable core and cable with same

Info

Publication number: CN221225892U
Application number: CN202322722307.XU
Authority: CN
Inventors: 殷杰; 曹磊; 欧东东; 王斌; 李坤朋; 王祺; 缪小林
Original assignee: Zhongtian Radio Frequency Cable Co ltd
Current assignee: Zhongtian Radio Frequency Cable Co ltd
Priority date: 2023-10-10
Filing date: 2023-10-10
Publication date: 2024-06-25
Anticipated expiration: 2033-10-10

Abstract

The utility model provides a cable core and a cable with the same, which comprises: the core wire unit comprises a plurality of single wires, a first shielding layer and a first insulating layer, wherein the single wires are mutually stranded, the first shielding layer is sleeved on the outer sides of the single wires, and the first insulating layer is sleeved on the outer sides of the first shielding layer; a second shielding layer and a second insulating layer; the plurality of core wire units are arranged, the second shielding layer is sleeved outside the plurality of core wire units, and the second insulating layer is sleeved outside the second shielding layer; one of the first shielding layer and the second shielding layer is a first electrostatic shielding layer, and the other is a first magnetostatic shielding layer. By the technical scheme provided by the utility model, the problem of poor electromagnetic shielding performance of the cable in the prior art can be solved.

Description

Cable core and cable with same

Technical Field

The utility model relates to the technical field of cables, in particular to a cable core and a cable with the cable core.

Background

The railway axle counting cable is mainly used for checking the occupied or idle state of the track section in the station, and the axle counting cable is mainly used for traction power supply type systems with 750V direct current and 1500V direct current. The axial cable generally comprises a cable core and a protective layer coated on the outer side of the cable core. The current axle counting cable has poor electromagnetic shielding performance, namely, the axle counting cable is greatly influenced by an electric field and a magnetic field and cannot be applied to an alternating current 25KV power supply system.

Disclosure of utility model

The utility model provides a cable core and a cable with the same, which are used for solving the problem of poor electromagnetic shielding performance of the cable in the prior art.

According to one aspect of the present utility model, there is provided a cable core comprising: the core wire unit comprises a plurality of single wires, a first shielding layer and a first insulating layer, wherein the single wires are mutually stranded, the first shielding layer is sleeved on the outer sides of the single wires, and the first insulating layer is sleeved on the outer sides of the first shielding layer; a second shielding layer and a second insulating layer; the plurality of core wire units are arranged, the second shielding layer is sleeved outside the plurality of core wire units, and the second insulating layer is sleeved outside the second shielding layer; one of the first shielding layer and the second shielding layer is a first electrostatic shielding layer, and the other is a first magnetostatic shielding layer.

Further, the mechanical strength of the second shielding layer is greater than the mechanical strength of the first shielding layer.

Further, the first shielding layer is a copper strip shielding layer; the second shielding layer is galvanized steel wire.

Further, the cable core further comprises a drain wire disposed on the first electrostatic shielding layer.

Further, each core wire unit is provided with two single wires.

According to another aspect of the present utility model, there is provided a cable comprising: a plurality of the cable cores; the protection layer comprises a third shielding layer, a third insulating layer, a fourth shielding layer and a fourth insulating layer which are sleeved in sequence, and the third shielding layer is sleeved on the outer sides of the cable cores; one of the third shielding layer and the fourth shielding layer is a second electrostatic shielding layer, and the other is a second magnetostatic shielding layer.

Further, the fourth shielding layer has a mechanical strength greater than that of the third shielding layer.

Further, the third shielding layer is an aluminum sheath; the fourth shielding layer is a double steel tape armor layer.

Further, the fourth insulating layer includes: and the aerogel protection layer is wrapped on the outer side of the third shielding layer.

Further, the fourth insulating layer further includes: and the melamine grease protective layer is wrapped on the outer side of the aerogel protective layer.

Further, the melamine resin protective layer includes: the melamine grease bubble layer is wrapped on the outer side of the aerogel protective layer and is provided with flame-retardant bubbles; the melamine grease sheath surface layer is wrapped on the outer side of the melamine grease bubble layer.

Further, the protective layer further comprises a heat insulation part, the heat insulation part is sleeved outside the plurality of cable cores, and the third shielding layer is sleeved outside the heat insulation part.

Further, the cable further includes: and the plurality of cable cores are arranged on the outer side of the flame-retardant rope in a surrounding mode.

By applying the technical scheme of the utility model, the first shielding layer is sleeved outside the plurality of single wires, the second shielding layer is sleeved outside the plurality of core wire units, one of the first shielding layer and the second shielding layer is a first electrostatic shielding layer, and the other is a first magnetostatic shielding layer. When the electromagnetic wave passes through the first electrostatic shielding layer, the electric field is terminated at the surface of the shielding body, and when the electromagnetic wave passes through the first magnetostatic shielding layer, the magnetic field is limited in the shielding body. The arrangement increases the reflection times of the electromagnetic wave on the surface of the shielding body and the attenuation of the energy of the electromagnetic wave in the shielding body. Compared with the traditional technical scheme, the first electrostatic shielding layer and the first magnetostatic shielding layer are combined with each other, so that the influence of electromagnetic waves on the cable core is weakened, and the electromagnetic shielding effect is effectively improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

Fig. 1 shows a schematic structural diagram of a cable core provided by the utility model;

fig. 2 shows a schematic structural diagram of the cable provided by the utility model.

Wherein the above figures include the following reference numerals:

10. a core wire unit;

11. A single line; 111. a copper conductor; 112. a fifth insulating layer; 12. a first shielding layer; 13. a first insulating layer;

21. a second shielding layer; 22. a second insulating layer;

30. a drain wire;

41. a third shielding layer; 42. a third insulating layer;

50. A fourth shielding layer;

60. a fourth insulating layer;

61. An aerogel protective layer; 62. a melamine grease protective layer; 621. a melamine lipid bubble layer; 622. a melamine resin sheath surface layer;

70. a heat insulation part; 71. a sixth insulating layer; 72. a polyethylene heat insulation layer;

80. a flame retardant rope.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, an embodiment of the present utility model provides a cable core including a core wire unit 10, a second shielding layer 21, and a second insulation layer 22. The core wire unit 10 includes a plurality of single wires 11, a first shielding layer 12 and a first insulating layer 13, the single wires 11 are provided in plurality, the plurality of single wires 11 are intertwisted with each other, the first shielding layer 12 is sleeved outside the plurality of single wires 11, and the first insulating layer 13 is sleeved outside the first shielding layer 12. The core wire units 10 are provided in plurality, the second shielding layer 21 is sleeved outside the plurality of core wire units 10, and the second insulating layer 22 is sleeved outside the second shielding layer 21. One of the first shield layer 12 and the second shield layer 21 is a first electrostatic shield layer, and the other is a first magnetostatic shield layer.

By applying the technical scheme of the utility model, the first shielding layer 12 is sleeved outside the plurality of single wires, the second shielding layer 21 is sleeved outside the plurality of core wire units 10, one of the first shielding layer 12 and the second shielding layer 21 is a first electrostatic shielding layer, and the other is a first magnetostatic shielding layer. When the electromagnetic wave passes through the first electrostatic shielding layer, the electric field is terminated at the surface of the shielding body, and when the electromagnetic wave passes through the first magnetostatic shielding layer, the magnetic field is limited in the shielding body. The arrangement increases the reflection times of the electromagnetic wave on the surface of the shielding body and the attenuation of the energy of the electromagnetic wave in the shielding body. Compared with the traditional technical scheme, the first electrostatic shielding layer and the first magnetostatic shielding layer are combined with each other, so that the influence of electromagnetic waves on the cable core is weakened, and the electromagnetic shielding effect is effectively improved.

Further, the mechanical strength of the second shielding layer 21 is greater than that of the first shielding layer 12. By the arrangement, the second shielding layer 21 has a protective effect on the whole cable core, and the whole mechanical strength of the cable core is improved.

The specific materials of the first shielding layer 12, the first insulating layer 13, the second shielding layer 21 and the second insulating layer 22 are not limited in this embodiment.

In this embodiment, the first shielding layer 12 is a copper strip shielding layer, and the copper strip shielding layer is a first electrostatic shielding layer. Specifically, the outer sides of the plurality of single wires 11 are formed by longitudinal wrapping of copper strips.

The first insulating layer 13 is made of polyester tape, and the first insulating layer 13 is wrapped on the outer side of the copper tape shielding layer. The thickness of the first insulating layer 13 is set between 0.3mm and 0.5mm, and may be specifically set to 0.3mm, 0.4mm, or 0.5mm.

In this embodiment, the second shielding layer 21 is a galvanized steel wire, and the galvanized steel wire is a first magnetostatic shielding layer. The second shielding layer 21 is provided in the form of a galvanized steel wire so that the galvanized steel wire is sleeved outside the plurality of core wire units 10, thereby enabling crosstalk to be effectively controlled.

The galvanized steel wires were woven on the outside of the first insulating layer 13, the gauge of the galvanized steel wires being 7 x 0.02mm. The braid density of the galvanized steel wire is not less than 85%, and specifically, the braid density of the galvanized steel wire may be set to 85%, 87%, 90%, 92%, 94% or 96%.

The second insulating layer 22 is made of polyester tape, and the second insulating layer 22 is wrapped around the outer side of the galvanized steel wire. The thickness of the second insulating layer 22 is set between 0.3mm and 0.5mm, and may be specifically set to 0.3mm, 0.4mm, or 0.5mm.

Further, the cable core further includes a drain wire 30, the drain wire 30 being disposed on the first electrostatic shielding layer. In this embodiment, one drain wire 30 is provided on the outside of each copper tape shield. By the arrangement, the drain wire 30 can be ensured to effectively ground the copper strip shielding layer, current generated by electromagnetic interference is led into the ground, and the running safety of the circuit is improved.

In this embodiment, the diameter of the drain wire 30 is set between 0.3mm and 0.5mm, and may be specifically set to 0.3mm, 0.4mm or 0.5mm.

The present solution does not limit the number of single wires 11 within each core wire unit 10. In the present embodiment, each core wire unit 10 is provided with two single wires 11. That is, the single wire 11 is formed by twisting two wire groups, and this arrangement can provide the core wire unit 10 with better electromagnetic stability and interference resistance.

Specifically, the single wire 11 includes a copper conductor 111 and a fifth insulating layer 112 provided outside the copper conductor 111.

Wherein the diameter of the copper conductor 111 is set between 0.6mm and 1.8mm. Specifically, the thickness of the sheet can be set to 0.6mm, 0.8mm, 1mm or 1.8mm.

The fifth insulating layer 112 is formed on the outer side of the copper conductor 111 at one time by using a polyethylene insulating material through three-layer co-extrusion technology of an inner layer, an intermediate layer and an outer layer.

As shown in fig. 1 and 2, an embodiment of the present utility model further provides a cable including the cable core and the protective layer of the plurality of above embodiments. The protective layer comprises a third shielding layer 41, a third insulating layer 42, a fourth shielding layer 50 and a fourth insulating layer 60 which are sleeved in sequence, and the third shielding layer 41 is sleeved on the outer sides of the cable cores; one of the third shield layer 41 and the fourth shield layer 50 is a second electrostatic shield layer, and the other is a second magnetostatic shield layer. The arrangement of the second electrostatic shielding layer and the second magnetostatic shielding layer can further strengthen the interference to external strong electromagnetic waves and strengthen the electromagnetic shielding effect of the cable.

Further, the mechanical strength of the fourth shielding layer 50 is greater than that of the third shielding layer 41. By such arrangement, the mechanical strength of the cable can be improved, so that the fourth shielding layer 50 plays a role in protecting the whole cable.

The specific materials of the third shielding layer 41, the third insulating layer 42, the fourth shielding layer 50 and the fourth insulating layer 60 are not limited in this embodiment.

In this embodiment, the third shielding layer 41 is an aluminum sheath, and the thickness of the aluminum sheath is set between 0.8mm and 1.2mm, specifically may be set to 0.8mm, 0.9mm, 1mm or 1.2mm.

The third insulating layer 42 is a polyethylene sheath, and the thickness of the polyethylene sheath is set between 0.8mm and 1.2mm, specifically may be set to 0.8mm, 0.9mm, 1mm or 1.2mm.

The fourth shielding layer 50 is a double steel tape armor layer, and the thickness of the steel tape used for the double steel tape armor layer is set between 0.2mm and 0.8mm, specifically may be set to 0.2mm, 0.3mm, 0.5mm or 0.8mm. The gap rate of the steel strips used for the double steel strip armor layer is set between 30% and 45%, and can be set to 30%, 35%, 40% or 45% in particular.

Specifically, the fourth insulating layer 60 includes an aerogel protection layer 61, and the aerogel protection layer 61 is wrapped around the outside of the third shielding layer 41. The aerogel protection layer 61 has the heat-insulating and fireproof effects, and can effectively improve the heat-insulating and fireproof effects of the cable.

In this embodiment, the specific formulation of the aerogel protection layer 61 is silicate aerogel 50%, silica is used as the heat insulation layer filler to account for 30%, and polyethylene resin is used as the modifier to account for 20%. During preparation, the materials are uniformly mixed and then subjected to extrusion molding through a single screw extrusion process, and the method can effectively improve the heat insulation performance and mechanical strength of the aerogel so as to ensure the normal operation of a circuit when a fire disaster occurs. And, before the double steel tape armor is wrapped up in to aerogel, carry out microwave heating to double steel tape armor to promote the joint strength between aerogel protective layer 61 and the double steel tape armor.

In this embodiment, the thickness of the aerogel protection layer 61 is set between 3mm and 5mm. In particular, it may be set to 3mm, 4mm or 5mm.

Further, the fourth insulating layer 60 further includes a melamine resin protective layer 62, and the melamine resin protective layer 62 is wrapped on the outer side of the aerogel protective layer 61. The provision of the melamine resin protective layer 62 can further improve the mechanical strength of the cable and the sealing property of the cable.

Specifically, the melamine resin protective layer 62 includes a melamine resin bubble layer 621 and a melamine resin sheath surface layer 622, the melamine resin bubble layer 621 is wrapped on the outer side of the aerogel protective layer 61, and the melamine resin bubble layer 621 has flame retardant bubbles. The melamine resin sheath surface layer 622 is wrapped around the outside of the melamine resin bubble layer 621. By the arrangement, the flame-retardant gas stored in the melamine grease protective layer 62 can be released at the initial stage of fire disaster, so that the fire behavior is effectively controlled, the time is provided for fire rescue, and the fireproof effect of the melamine grease protective layer 62 is improved.

In this scheme, the melamine grease bubble layer 621 is disposed between the melamine grease sheath surface layer 622 and the aerogel protective layer 61, and can provide good insulation performance, and the bubble structure can prevent heat and electricity conduction, so as to protect the safe operation of the cable. The melamine grease bubble layer 621 can also realize lower density, so that the axle counting cable is light, the overall weight is reduced, and the installation and the transportation are convenient. The melamine resin bubble layer 621 has good flexibility and elasticity, and can be adapted to the axle counting cables with different shapes and curves, and provides good resistance performance.

In this scheme, the melamine grease sheath surface 622 is disposed on the outer side of the melamine grease bubble layer 621, so that protection of the melamine grease bubble layer 621 can be achieved, good sealing performance is provided, and influences of moisture, dust and other external factors on the cable are reduced or avoided.

Further, the thickness of the melamine resin protective layer 62 is set to 2mm to 3mm. The thickness of the melamine resin protective layer 62 may be set to 2mm, 2.3mm, 2.5mm, 2.7mm, or 3mm. In this embodiment, the thickness of the melamine resin protective layer 62 is set to 2.5mm.

Specifically, the ratio of the thickness of the melamine resin sheath surface 622 to the thickness of the melamine resin protective layer 62 is set to 0.2 to 0.3. When the ratio of the thickness of the melamine resin sheath surface 622 to the thickness of the melamine resin protective layer 62 is less than 0.2, the thickness of the melamine resin sheath surface 622 may be too thin, which may affect the protection effect of the melamine resin bubble layer 621; when the ratio of the thickness of the melamine resin jacket surface 622 to the thickness of the melamine resin protective layer 62 is higher than 0.3, the thickness of the melamine resin bubble layer 621 may be excessively thin, affecting the flame retardant effect of the melamine resin bubble layer 621.

Wherein, the ratio of the thickness of the melamine resin sheath surface 622 to the melamine resin protective layer 62 can be set to 0.2, 0.25 or 0.3. In this embodiment, the ratio of the thickness of the melamine resin sheath surface 622 to the melamine resin protective layer 62 is set to 0.25.

The specific form of the flame retardant gas is not limited in this scheme, and may be carbon dioxide or nitrogen.

Specifically, the melamine resin protective layer 62 is prepared by a single screw through a three-layer coextrusion process, and in the preparation process, the inner layer of the single screw melting section is inflated in a supersonic inflation mode to control the flow rate and pressure of the flame retardant gas so as to ensure the void structure of the flame retardant gas and the content of the flame retardant gas.

In this embodiment, the aperture of the flame retardant air bubbles is set to 0.08mm to 0.2mm; the porosity of the flame retardant bubbles was set to 40% to 60%.

When the pore diameter of the flame retardant bubble is less than 0.08mm, the formation of flame retardant bubbles may be inconvenient, and when the pore diameter of the flame retardant bubble is greater than 0.2mm, the breakage of the melamine lipid bubble layer 621 may occur easily due to the overlarge pore diameter of the flame retardant bubble, and the structural strength is low. Therefore, the present embodiment can ensure the formation of flame retardant bubbles by setting the pore diameters of the flame retardant bubbles in the above-mentioned range, and can also ensure the structural strength of the melamine resin bubble layer 621.

When the porosity of the flame retardant bubbles is less than 40%, too little flame retardant gas may be caused, and the flame retardant effect cannot be effectively achieved. When the porosity of the flame-retardant air bubbles is higher than 60%, the mechanical properties may be reduced, and the cable is broken when laid, so that the porosity of the flame-retardant air bubbles is set in the range.

Further, the protection layer further includes a heat insulation portion 70, the heat insulation portion 70 is sleeved outside the plurality of cable cores, and the third shielding layer 41 is sleeved outside the heat insulation portion 70. The provision of the heat insulating portion 70 can further enhance the heat insulating effect of the cable.

In the present embodiment, the heat insulating part 70 includes a sixth insulating layer 71 and a polyethylene heat insulating layer 72, the sixth insulating layer 71 is made of a polyester tape, and the thickness of the sixth insulating layer 71 is set to be between 0.03mm and 0.05mm, specifically, may be set to be 0.03mm, 0.04mm, or 0.05mm. The thickness of the polyethylene insulation layer 72 may be set to 0.8mm to 1.2mm, and specifically may be set to 0.8mm, 0.9mm, 1mm, or 1.2mm.

Further, the cable further comprises a flame retardant rope 80, and a plurality of cable cores are arranged on the outer side of the flame retardant rope 80 in a surrounding mode. The arrangement of the flame retardant rope 80 can further promote the flame retardant effect of the cable. In this embodiment, the diameter of the flame retardant cord 80 is set between 4mm and 9mm, and may be specifically set to 4mm, 5mm, 8mm or 9mm.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A cable core, the cable core comprising:

The core wire unit (10), the core wire unit (10) comprises single wires (11), a first shielding layer (12) and a first insulating layer (13), wherein the single wires (11) are provided with a plurality of single wires (11) which are twisted with each other, the first shielding layer (12) is sleeved on the outer sides of the single wires (11), and the first insulating layer (13) is sleeved on the outer sides of the first shielding layer (12);

a second shielding layer (21) and a second insulating layer (22);

wherein the plurality of core wire units (10) are arranged, the second shielding layers (21) are sleeved outside the plurality of core wire units (10), and the second insulating layers (22) are sleeved outside the second shielding layers (21); one of the first shielding layer (12) and the second shielding layer (21) is a first electrostatic shielding layer, and the other is a first magnetostatic shielding layer.

2. A cable core according to claim 1, characterized in that the mechanical strength of the second shielding layer (21) is greater than the mechanical strength of the first shielding layer (12).

3. The cable core according to claim 2, wherein,

The first shielding layer (12) is a copper strip shielding layer;

the second shielding layer (21) is a galvanized steel wire.

4. The cable core of claim 1, further comprising a drain wire (30), the drain wire (30) being disposed on the first electrostatic shield layer.

5. Cable core according to claim 1, wherein each core element (10) is provided with two of said single wires (11).

6. A cable, comprising:

A plurality of cable cores according to any one of claims 1 to 5;

the protection layer comprises a third shielding layer (41), a third insulating layer (42), a fourth shielding layer (50) and a fourth insulating layer (60) which are sleeved in sequence, and the third shielding layer (41) is sleeved on the outer sides of the cable cores;

Wherein one of the third shielding layer (41) and the fourth shielding layer (50) is a second electrostatic shielding layer, and the other is a second magnetostatic shielding layer.

7. Cable according to claim 6, characterized in that the fourth shielding layer (50) has a mechanical strength greater than that of the third shielding layer (41).

8. The cable of claim 7, wherein the cable is made of a material selected from the group consisting of,

The third shielding layer (41) is an aluminum sheath; the fourth shielding layer (50) is a double steel tape armor layer.

9. The cable according to claim 6, characterized in that the fourth insulating layer (60) comprises:

And an aerogel protection layer (61) wrapping the outer side of the third shielding layer (41).

10. The cable according to claim 9, wherein the fourth insulating layer (60) further comprises:

and the melamine grease protective layer (62) is wrapped on the outer side of the aerogel protective layer (61).

11. The cable according to claim 10, wherein the melamine grease protective layer (62) comprises:

A melamine grease bubble layer (621) wrapping the outer side of the aerogel protection layer (61), wherein the melamine grease bubble layer (621) has flame-retardant bubbles;

and a melamine resin sheath surface layer (622) which is wrapped outside the melamine resin bubble layer (621).

12. The cable according to claim 6, wherein the protective layer further comprises a heat insulation part (70), the heat insulation part (70) is sleeved outside a plurality of the cable cores, and the third shielding layer (41) is sleeved outside the heat insulation part (70).

13. The cable of claim 6, further comprising:

And the cable cores are surrounded on the outer sides of the flame-retardant ropes (80).