Shielding type fireproof power cable

Abstract

The utility model discloses a shielding type fireproof power cable which comprises a metal wire core, an insulating layer is sleeved outside the metal wire core, the insulating layer is provided with a shielding layer far away from the metal wire core, the shielding layer is provided with a first isolation layer far away from the insulating layer, the first isolation layer is provided with a first filling layer far away from the shielding layer, and the first filling layer is provided with a second filling layer far away from the shielding layer. The first filler layer is provided with a second isolation layer far away from the first isolation layer, the second isolation layer is provided with a second filler layer far away from the first filler layer, the second filler layer is provided with a third isolation layer far away from the second isolation layer, and the third isolation layer is provided with a protective sleeve far away from the second filler layer. The protective sleeve is provided with an armor layer away from the third isolation layer. Through the above structure, the metal wire cores, the insulating layer, the shielding layer, the first isolation layer, the first filler layer, the second isolation layer, the second filler layer, the third isolation layer, the protective sleeve and the armor layer are arranged, so that the fire resistance of the power cable can be greatly enhanced, and the harm caused by circuit fire can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a shielded fire-resistant power cable. Background Art

[0002] Cables are made of one or more mutually insulated conductors and an outer insulating protective layer. They are wires that transmit electricity or information from one place to another. Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. They are all composed of single or multiple strands of wires and insulation layers, used to connect circuits, electrical appliances, etc. With the development of the ultra-high voltage power cable market, long-distance power transmission, the construction of large substations, and laying in tunnels all require ultra-high voltage power cables. The market demand for high-voltage power cables continues to increase, and there are more and more application scenarios. Power plants, substations, and industrial and mining enterprises all use power cables in large quantities. Once the cable catches fire and explodes, it will cause serious fires and power outages. In addition, when the cable burns, it produces a lot of smoke and toxic gases, which not only pollutes the environment, but also endangers human life. For this reason, attention should be paid to the fire prevention of power cables. The fire resistance of cables during use is an important performance. The cable is not affected by the external environment to the greatest extent. External fire sources cannot damage the cable core, ensuring the normal use of the cable core.

[0003] The insulation layer of power cables is composed of various combustible materials such as paper, oil, hemp, rubber, plastic, asphalt, etc., so the fire resistance of power cables is poor. However, people have higher and higher requirements on the fire resistance of power cables, so the current power cables cannot meet the use requirements. Utility Model Content

[0004] The utility model provides a shielded fire-resistant power cable, which can greatly enhance the fire resistance of the power cable and reduce the harm caused by circuit fire.

[0005] To achieve the above-mentioned purpose, a shielded fire-resistant power cable is provided, comprising a metal wire core, an insulating layer is sheathed on the outside of the metal wire core, a shielding layer is arranged on the insulating layer away from the metal wire core, a first isolation layer is arranged on the shielding layer away from the insulating layer, a first filler layer is arranged on the first isolation layer away from the shielding layer, a second isolation layer is arranged on the first isolation layer away from the first isolation layer, a second isolation layer is arranged on the second isolation layer away from the first isolation layer, a third isolation layer is arranged on the second isolation layer away from the second isolation layer, a protective cover is arranged on the third isolation layer away from the second packing layer, and an armor layer is arranged on the protective cover away from the third isolation layer. The shielding layer is provided to facilitate shielding the electromagnetic radiation generated when the metal wire core is energized, so as to avoid the influence of electromagnetic radiation on electrical appliances. The insulating layer is provided to facilitate isolation of the metal wire core. The first isolation layer, the second isolation layer and the third isolation layer are provided to facilitate the placement of the first filling layer and the second filling layer. The first filling layer is provided to facilitate isolation of fire and heat dissipation. The second filling layer is provided to facilitate absorption of heat and production of non-combustible substances to dilute the combustible gas during decomposition to achieve the purpose of flame retardancy. The protective cover and the armor layer are provided to facilitate protection of the outside of the cable to avoid scratches and the like.

[0006] According to the shielded fire-resistant power cable, the insulating layer is made of polyethylene, and the inside of the insulating layer is in close contact with the outer surface of the metal core.

[0007] According to the shielded fire-resistant power cable, the shielding layer is made of nickel-plated graphite filled with silicone rubber, and the shielding layer is sleeved on the outside of the insulating layer.

[0008] According to the shielded fire-resistant power cable, the first insulating layer is made of glass fiber mesh cloth, the first insulating layer is provided with an insulating paint layer on the side close to the insulating layer, and the first insulating layer is sleeved on the outside of the shielding layer. The insulating paint layer is provided to facilitate the cable to still have the ability to shield the internal electromagnetic field after the shielding layer is damaged.

[0009] According to the shielded fire-resistant power cable, the first filler layer is made of wollastonite powder, and the first filler layer is sandwiched between the first isolation layer and the second isolation layer. The wollastonite powder can be used to isolate, conduct heat, and cool down the external high temperature, thereby preventing the internal cables from igniting.

[0010] According to the shielded fire-resistant power cable, the second filler layer is made of zinc borate, and the second filler layer is sandwiched between the second isolation layer and the third isolation layer. The zinc borate is provided to facilitate the use of the large amount of heat absorbed by the zinc borate during decomposition and the non-combustible substances produced to dilute the combustible gas to achieve the purpose of flame retardancy.

[0011] According to the shielded fire-resistant power cable, the second isolation layer and the third isolation layer are made of glass fiber mesh cloth, the protective sleeve is made of halogen-free polyolefin, and the protective sleeve is sleeved on the outside of the third isolation layer.

[0012] According to the shielded fire-resistant power cable, the armor layer is sleeved on the outside of the protective sheath, and the metal core is composed of a plurality of metal wires.

[0013] The beneficial effects of the utility model are as follows: by arranging a metal wire core, an insulating layer, a shielding layer, a first isolation layer, a first filler layer, a second isolation layer, a second filler layer, a third isolation layer, a protective cover and an armor layer, the fire resistance of the power cable can be greatly enhanced and the harm caused by circuit fire can be reduced.

[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 a schematic diagram of the overall structure of a shielded fire-resistant power cable of the utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of a shielded fire-resistant power cable of the utility model;

[0018] Figure 3 This is an enlarged view of the local structure at A of a shielded fire-resistant power cable of the utility model;

[0019] Figure 4 This is a partial cross-sectional structural diagram of the first isolation layer of a shielded fire-resistant power cable of the utility model.

[0020] Legend:

[0021] 1. Metal wire core; 2. Insulation layer; 3. Shielding layer; 4. First isolation layer; 401. Insulation paint layer; 5. First stuffing layer; 6. Second isolation layer; 7. Second stuffing layer; 8. Third isolation layer; 9. Protective cover; 10. Armor layer. 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 shielded fire-resistant power cable, which includes a metal core 1, an insulating layer 2 is sheathed on the outside of the metal core 1, a shielding layer 3 is arranged on the insulating layer 2 away from the metal core 1, a first isolation layer 4 is arranged on the shielding layer 3 away from the insulating layer 2, a first packing layer 5 is arranged on the first isolation layer 4 away from the shielding layer 3, a second isolation layer 6 is arranged on the first packing layer 5 away from the first isolation layer 4, a second packing layer 7 is arranged on the second isolation layer 6 away from the first packing layer 5, a third isolation layer 8 is arranged on the second packing layer 7 away from the second isolation layer 6, a protective cover 9 is arranged on the third isolation layer 8 away from the second packing layer 7, and an armor layer 10 is arranged on the protective cover 9 away from the third isolation layer 8. The armor layer 10 can be made by winding metal sheets, and the armor layer 10 is sheathed on the outside of the protective cover 9. The metal core 1 is composed of multiple metal wires, and the armor layer 10 prevents the cable sheath from being scratched by sharp objects.

[0024] The first insulating layer 4 is made of glass fiber mesh cloth, and the first insulating layer 4 is provided with an insulating paint layer 401 on one side close to the insulating layer 2. The first insulating layer 4 is sleeved on the outside of the shielding layer 3. The second insulating layer 6 and the third insulating layer 8 are made of glass fiber mesh cloth, and the protective cover 9 is made of halogen-free polyolefin. The protective cover 9 is sleeved on the outside of the third insulating layer 8. The glass fiber mesh cloth is based on medium-alkali or alkali-free glass fiber woven fabric and is treated with an alkali-resistant coating. It has the characteristics of alkali resistance, acid resistance, water resistance, cement erosion resistance and other chemical corrosion resistance, mildew resistance, insect resistance, fire resistance, heat preservation, sound insulation, insulation, etc., which can make the cable have higher strength.

[0025] The material of the first filler layer 5 is wollastonite powder, and the first filler layer 5 is stuck between the first isolation layer 4 and the second isolation layer 6 . The material of the second filler layer 7 is zinc borate, and the second filler layer 7 is stuck between the second isolation layer 6 and the third isolation layer 8 .

[0026] The insulating layer 2 is made of polyethylene, and the inside of the insulating layer 2 is in close contact with the outer surface of the metal wire core 1. The shielding layer 3 is made of graphite nickel-plated silicone rubber. The shielding layer 3 is sleeved on the outside of the insulating layer 2. The graphite nickel-plated silicone rubber can absorb the electromagnetic waves generated by the energized cables to prevent electrical appliances from being interfered with by electromagnetic interference.

[0027] Working principle: The outermost armor layer 10 of the cable can protect the protective sheath 9 of the cable to prevent it from being scratched by sharp objects. When there is a fire outside, the protective sheath 9 will not produce toxic gas when ignited at high temperature, thereby reducing the danger of fire. At this time, the zinc borate in the second filling layer 7 will absorb a large amount of heat, thereby cooling the outside. At the same time, its decomposition process will produce non-combustible substances to dilute the combustible gas and achieve the purpose of flame retardancy. At the same time, the wollastonite powder in the first filling layer will block the external high temperature to protect the inside of the cable.

[0028] 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, and 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 shielded fire-resistant power cable, characterized in that: The invention comprises a metal wire core (1), wherein an insulating layer (2) is sheathed on the outer side of the metal wire core (1), wherein a shielding layer (3) is arranged on the insulating layer (2) away from the metal wire core (1), wherein a first insulating layer (4) is arranged on the shielding layer (3) away from the insulating layer (2), wherein a first packing layer (5) is arranged on the first insulating layer (4) away from the shielding layer (3), wherein a second insulating layer (6) is arranged on the first packing layer (5) away from the first insulating layer (4), wherein a second packing layer (7) is arranged on the second insulating layer (6) away from the first packing layer (5), wherein a third insulating layer (8) is arranged on the second packing layer (7) away from the second insulating layer (6), wherein a protective sleeve (9) is arranged on the third insulating layer (8) away from the second packing layer (7), and wherein an armoring layer (10) is arranged on the protective sleeve (9) away from the third insulating layer (8).

2. A shielded fire-resistant power cable according to claim 1, characterized in that: The insulating layer (2) is made of polyethylene, and the interior of the insulating layer (2) is in close contact with the outer surface of the metal wire core (1).

3. A shielded fire-resistant power cable according to claim 1, characterized in that: The shielding layer (3) is made of graphite nickel-plated and filled with silicone rubber, and the shielding layer (3) is sleeved on the outside of the insulating layer (2).

4. A shielded fire-resistant power cable according to claim 1, characterized in that: The first isolation layer (4) is made of glass fiber mesh cloth, an insulating paint layer (401) is provided on one side of the first isolation layer (4) close to the insulating layer (2), and the first isolation layer (4) is sleeved on the outside of the shielding layer (3).

5. A shielded fire-resistant power cable according to claim 1, characterized in that: The material of the first filler layer (5) is wollastonite powder, and the first filler layer (5) is stuck between the first isolation layer (4) and the second isolation layer (6).

6. A shielded fire-resistant power cable according to claim 1, characterized in that: The material of the second filler layer (7) is zinc borate, and the second filler layer (7) is sandwiched between the second isolation layer (6) and the third isolation layer (8).

7. A shielded fire-resistant power cable according to claim 1, characterized in that: The second isolation layer (6) and the third isolation layer (8) are made of glass fiber mesh cloth, the protective sleeve (9) is made of halogen-free polyolefin, and the protective sleeve (9) is sleeved on the outside of the third isolation layer (8).

8. A shielded fire-resistant power cable according to claim 1, characterized in that: The armor layer (10) is sleeved on the outside of the protective sleeve (9), and the metal wire core (1) is composed of a plurality of metal wires.

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