High-reliability halogen-free low-smoke flame-retardant fireproof cable

Abstract

The utility model discloses a high-reliability halogen-free low-smoke flame-retardant fire-resistant cable, which comprises a fixed framework, the outer surface of the fixed framework is fixedly connected with a first fireproof heat-insulating layer, the outer surface of the first fireproof heat-insulating layer is fixedly connected with a metal braid layer, the outer surface of the metal braid layer is fixedly connected with a waterproof protective layer, and the outer surface of the waterproof protective layer is fixedly connected with a second fireproof heat-insulating layer. The outer surface of the waterproof protection layer is fixedly connected with a waterproof layer, the outer surface of the waterproof layer is fixedly connected with a second fireproof heat insulation layer and a tensile structure, the tensile structure comprises a third fireproof heat insulation layer, a steel cable and an insulation layer, and the outer surface of the steel cable is fixedly connected with the insulation layer. The tensile structure is arranged in the cable, so that the tensile property can be improved, cable breakage caused by damage to the internal tensile structure after the cable is on fire can be prevented, the situation that the cable is damaged by severe weather and other severe conditions is reduced, and the maintenance cost of the cable is reduced; and the safety of electric power workers in high-altitude operation is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission equipment, in particular to a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable. Background Art

[0002] Cable is made of one or more mutually insulated conductors and an outer insulating protective layer, which transmits electricity or information from one place to another. With the continuous advancement of urbanization, power cables have been widely used in society, and their engineering usage has continued to increase.

[0003] However, the tensile strength of existing halogen-free, low-smoke, flame-retardant and fire-resistant cables is mostly provided only by the various protective layers of the cables and the cable core itself, which will lead to insufficient tensile strength of the cables. When strong winds or other conditions apply tension to the cables, the cables are prone to damage and breakage, affecting the power-on effect and increasing maintenance costs. Insufficient tensile strength may also pose a safety hazard to power workers performing maintenance work on high-altitude cables. After searching, it was found that the technical solution provided by the utility model with application number CN202220833104.0 also has the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable. By arranging a tensile structure inside the cable, the tensile resistance can be improved while preventing the internal tensile structure from being damaged after the cable catches fire, causing the cable to break. This reduces the external damage to the cable caused by bad weather and other bad conditions, reduces the maintenance cost of the cable, and also improves the safety of power workers working at high altitudes.

[0005] The utility model also provides the above-mentioned high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, comprising: a fixed skeleton, the outer surface of the fixed skeleton is fixedly connected to a first fireproof and heat-insulating layer, the outer surface of the first fireproof and heat-insulating layer is fixedly connected to a metal braided layer, the outer surface of the metal braided layer is fixedly connected to a waterproof protective layer, the outer surface of the waterproof protective layer is fixedly connected to a waterproof layer, and the outer surface of the waterproof layer is fixedly connected to a second fireproof and heat-insulating layer.

[0006] The tensile structure comprises a third fireproof and heat-insulating layer, a steel cable and an insulating layer. The outer surface of the steel cable is fixedly connected to the insulating layer, and the outer surface of the insulating layer is fixedly connected to the third fireproof and heat-insulating layer. By arranging the tensile structure inside the cable, the tensile resistance can be improved while preventing the internal tensile structure from being damaged after the cable catches fire, thereby reducing the external damage to the cable caused by bad weather and other bad conditions, reducing the maintenance cost of the cable, and also improving the safety of power workers working at high altitudes.

[0007] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the outer surface of the third fireproof and heat-insulating layer is fixedly connected to the fixed skeleton, and the inner surface of the fixed skeleton is fixedly connected with a rubber protective layer, which restricts the position of the cable core and prevents friction between the cable core and the fixed skeleton to protect the cable core and improve heat dissipation efficiency.

[0008] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, a spiral through hole is provided inside the fixed skeleton, and the outer surface of the rubber protective layer is fixedly connected to the spiral through hole, thereby increasing the contact area between the cable core and the fixed skeleton and improving the heat dissipation efficiency.

[0009] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the inner surface of the rubber protective layer is fixedly connected to a cable core, and the rubber protective layer is made of elastic rubber, which is convenient for protecting the cable core from wear and tear, thereby preventing the cable core from being worn and affecting the conductive effect.

[0010] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the number of the spiral through holes is eight and they are arranged in a circular array.

[0011] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the outer surface of the second fireproof and heat-insulating layer is fixedly connected with an outer skin, and the material of the outer skin is polyolefin, which can be flame-retardant and reduce the smoke generated during combustion.

[0012] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the materials of the first fireproof and heat-insulating layer, the second fireproof and heat-insulating layer and the third fireproof and heat-insulating layer are all asbestos, and the material of the fixed skeleton is a new type of graphene assembled thermal conductive material.

[0013] According to the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable, the insulating layer is made of polyethylene, and the waterproof layer and the waterproof protective layer are a double-layer co-extruded structure.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is the overall structure diagram of a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable of the utility model;

[0017] Figure 2 This is a cross-sectional view of a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable of the utility model;

[0018] Figure 3 This is the internal structure diagram of a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable of the utility model;

[0019] Figure 4 This is a fixed skeleton structure diagram of a high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable of the utility model.

[0020] Legend:

[0021] 1. Fixed skeleton; 2. First fireproof and heat-insulating layer; 3. Metal braided layer; 4. Waterproof protective layer; 5. Waterproof layer; 6. Second fireproof and heat-insulating layer; 7. Third fireproof and heat-insulating layer; 8. Steel cable; 9. Insulating layer; 10. Rubber protective layer; 11. Spiral through hole; 12. Cable core; 13. Outer skin. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-4 The utility model embodiment is a high reliability halogen-free low smoke flame retardant fire resistant cable, which includes: Figure 1 As shown, the high-reliability halogen-free, low-smoke, flame-retardant and fire-resistant cable of this embodiment comprises: a fixed skeleton 1, the material of the fixed skeleton 1 is a new type of graphene assembled thermal conductive material, the inner surface of the fixed skeleton 1 is fixedly connected with a rubber protective layer 10, the inner surface of the rubber protective layer 10 is fixedly connected with a cable core 12, the material of the rubber protective layer 10 is elastic rubber, a spiral through hole 11 is arranged inside the fixed skeleton 1, the number of the spiral through holes 11 is eight and they are arranged in a circular array, the outer surface of the rubber protective layer 10 is fixedly connected with the spiral through holes 11, the outer surface of the fixed skeleton 1 is fixedly connected with a first fireproof and heat-insulating layer 2, the outer surface of the first fireproof and heat-insulating layer 2 is fixedly connected with a metal braided layer 3, the outer surface of the metal braided layer 3 is fixedly connected with a waterproof protective layer 4, the outer surface of the waterproof protective layer 4 is fixedly connected with a waterproof layer 5, the waterproof layer 5 and the waterproof protective layer 4 are a double-layer co-extruded structure, the outer surface of the waterproof layer 5 is fixedly connected with a second fireproof and heat-insulating layer 6, the outer surface of the second fireproof and heat-insulating layer 6 is fixedly connected with an outer skin 13, the material of the outer skin 13 is polyolefin.

[0024] The tensile structure includes a third fireproof and heat-insulating layer 7, a steel cable 8 and an insulating layer 9. The insulating layer 9 is made of polyethylene. The first fireproof and heat-insulating layer 2, the second fireproof and heat-insulating layer 6 and the third fireproof and heat-insulating layer 7 are all made of asbestos. The outer surface of the third fireproof and heat-insulating layer 7 is fixedly connected to the fixed frame 1, the outer surface of the steel cable 8 is fixedly connected to the insulating layer 9, and the outer surface of the insulating layer 9 is fixedly connected to the third fireproof and heat-insulating layer 7.

[0025] Working principle: When a fire occurs outside, the outer skin 13 has a certain flame retardancy. When the outer skin 13 starts to burn, the material of the outer skin 13 prevents it from burning violently and producing a lot of smoke. At this time, the second fireproof and heat-insulating layer 6 will effectively prevent the fire from spreading to the internal cable core 12, and the internal waterproof layer 5 can effectively prevent external liquid from entering the interior and causing a short circuit. The waterproof protective layer 4 can prevent the metal braided layer 3 from wearing the waterproof layer 5 and protect the integrity of the waterproof layer 5. The internal steel cable 8 can enhance the overall tensile resistance of the cable and improve the strength of the cable. The second fireproof and heat-insulating layer 6 can prevent the spread of fire when the cable core 12 overheats and spontaneously combusts. The insulating layer 9 can prevent a short circuit from forming between the cable core 12 and the steel cable 8, and the third fireproof and heat-insulating layer 7 can prevent the cable core 12 from destroying the insulating layer 9 when it spontaneously combusts. The fixed skeleton 1 can not only fix the position of the cable core 12, but also dissipate heat from the cable core 12, thereby reducing the temperature of the cable core 12 and reducing the possibility of spontaneous combustion.

[0026] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A high reliability halogen-free low smoke flame retardant fire resistant cable, characterized in that: include: A fixed skeleton (1), wherein the outer surface of the fixed skeleton (1) is fixedly connected to a first fireproof and heat-insulating layer (2), the outer surface of the first fireproof and heat-insulating layer (2) is fixedly connected to a metal braided layer (3), the outer surface of the metal braided layer (3) is fixedly connected to a waterproof protective layer (4), the outer surface of the waterproof protective layer (4) is fixedly connected to a waterproof layer (5), and the outer surface of the waterproof layer (5) is fixedly connected to a second fireproof and heat-insulating layer (6); The tensile structure comprises a third fireproof and heat-insulating layer (7), a steel cable (8) and an insulating layer (9), wherein the outer surface of the steel cable (8) is fixedly connected to the insulating layer (9), and the outer surface of the insulating layer (9) is fixedly connected to the third fireproof and heat-insulating layer (7).

2. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 1, characterized in that: The outer surface of the third fireproof and heat-insulating layer (7) is fixedly connected to the fixed frame (1), and the inner surface of the fixed frame (1) is fixedly connected to a rubber protective layer (10).

3. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 2, characterized in that: A spiral through hole (11) is provided inside the fixed frame (1), and the outer surface of the rubber protective layer (10) is fixedly connected to the spiral through hole (11).

4. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 2, characterized in that: The inner surface of the rubber protective layer (10) is fixedly connected with a cable core (12), and the material of the rubber protective layer (10) is elastic rubber.

5. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 3, characterized in that: The number of the spiral through holes (11) is eight and they are arranged in a circular array.

6. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 1, characterized in that: The outer surface of the second fireproof and heat-insulating layer (6) is fixedly connected to an outer skin (13), and the material of the outer skin (13) is polyolefin.

7. A high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 1, characterized in that: The materials of the first fireproof heat-insulating layer (2), the second fireproof heat-insulating layer (6) and the third fireproof heat-insulating layer (7) are all asbestos, and the material of the fixed frame (1) is a new type of graphene assembled thermal conductive material.

8. The high reliability halogen-free, low smoke, flame retardant and fire resistant cable according to claim 1, characterized in that: The insulating layer (9) is made of polyethylene, and the waterproof layer (5) and the waterproof protective layer (4) are a double-layer co-extruded structure.

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