Fireproof cable structure

Abstract

The utility model discloses a fire-resistant cable structure which is characterized in that the fire-resistant cable structure comprises a cable structure body, a plurality of stranded core wire monomers are arranged in the cable structure body, and each core wire monomer comprises a copper conductor coaxially arranged from inside to outside. The fire-resistant oxygen-isolating structural layer wraps the peripheral radial surface of the copper conductor; the insulating structural layer wraps the peripheral radial surface of the fire-resistant oxygen-isolating structural layer; a first wrapping structure layer is arranged outside the plurality of stranded core wire monomers, and a second wrapping structure layer is wrapped on the peripheral radial surface of the first wrapping structure layer; the peripheral radial surface of the second wrapping structure layer is wrapped with an inner protection structure layer; the peripheral radial surface of the inner protection structure layer is wrapped with an outer protection structure layer; and filling bodies are arranged among the plurality of stranded core wire monomers.

Description

Technical Field

[0001] The utility model relates to the field of cable manufacturing, in particular to a fire-resistant cable structure. Background Art

[0002] With the development of society and the economy, more and more electrical equipment is being used in production and daily life. Fire-resistant cables are used everywhere, such as in high-rise buildings, subways, major industrial and mining enterprises, and large power stations, as transmission channels for power and signals. These places are closely related to fire safety and firefighting. Electrical fires account for about half of all fire accidents. Electrical fires can cause power outages to electrical equipment, and cables with substandard fire resistance can help spread the fire, causing greater loss of life and property.

[0003] Currently available fire-resistant cables, such as those in Chinese patent CN202210327656.9, use mica tape to wrap the fire-resistant layer. The mica tape easily absorbs moisture, and the fire-resistant layer has low adhesion when causing a fire. The fire-resistant performance is poor and the fire-resistant structure is weak. In the case of flames, the cable cannot maintain operation for a certain period of time, resulting in blocked lines and inability to alarm in time. In addition, fire elevators, water pumps and smoke exhaust devices cannot operate continuously in the event of an accident, causing serious injuries and losses to people.

[0004] Therefore, in view of the shortcomings of the above-mentioned technology, the purpose of the present invention is to provide a fire-resistant cable structure to overcome the defects of the fire-resistant cables in the prior art and enhance its fire resistance and structural strength. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a fire-resistant cable structure.

[0006] In order to achieve the purpose of this utility model, the technical solution adopted is:

[0007] A fire-resistant cable structure comprising:

[0008] A cable structure body, in which a plurality of twisted core wire units are arranged, wherein the core wire units include a copper conductor arranged coaxially from the inside to the outside, a fire-resistant oxygen-isolating structural layer wrapped around the radial surface of the copper conductor, and an insulating structural layer wrapped around the radial surface of the fire-resistant oxygen-isolating structural layer;

[0009] A first wrapping structure layer is provided outside the plurality of twisted core wire monomers, and a second wrapping structure layer is wrapped around the outer radial surface of the first wrapping structure layer;

[0010] An inner protective structure layer is wrapped around the outer radial surface of the second wrapping structure layer;

[0011] An outer protective structure layer is wrapped around the outer radial surface of the inner protective structure layer;

[0012] A filler is provided between the plurality of twisted core wire monomers;

[0013] The fire-resistant and oxygen-isolating structural layer is formed by wrapping ceramic silicone rubber fireproof cloth with a composite tape, the wrapping method is layer by layer, the wrapping tape thickness is 0.2-0.8mm, and the wrapping is 3-6 layers;

[0014] The insulating structure layer is made of flame-retardant ceramic polyolefin HPCC material;

[0015] The filler is glass fiber;

[0016] The first wrapping structure layer is a ceramic fireproof composite tape,

[0017] The second wrapping structure layer is a glass fiber tape,

[0018] The inner protective structure layer is a polyolefin resin mixed with a halogen-free flame retardant.

[0019] The outer protective structure layer is made of flame retardant B1 grade polyolefin resin.

[0020] In a preferred embodiment of the present invention, the copper conductor is a copper conductor with a tinned surface.

[0021] In a preferred embodiment of the present invention, the plurality of twisted core wire monomers are a first core wire monomer, a second core wire monomer, a third core wire monomer, a fourth core wire monomer and a fifth core wire monomer arranged around the center of a circle.

[0022] In a preferred embodiment of the present invention, the wrapping overlap rate of the ceramic fireproof composite tape is greater than 30%.

[0023] In a preferred embodiment of the present invention, the glass fiber tape is woven from glass fiber filaments, and the weaving density is 100%.

[0024] In a preferred embodiment of the present invention, the polyolefin resin mixed with the halogen-free flame retardant is a low-smoke halogen-free flame retardant polyolefin, and the thickness of the inner protective structure layer is 0.8-1.5 mm.

[0025] In a preferred embodiment of the present invention, the flame retardant B1 grade polyolefin resin is a flame retardant B1 grade polyolefin sheath material, and the thickness of the outer protective structure layer is 1.8-3.5 mm.

[0026] The beneficial effects of the present invention are:

[0027] The fire-resistant cable structure of the utility model can make the fire-resistant cable not break down for 180 minutes under a 950°C flame, not break down after being sprayed with water for 15 minutes, and not break down after being struck and vibrated for 15 minutes. It has high fire resistance and high cable structural strength, which ensures continuous power supply of the cable in the event of a fire, thereby increasing the rescue time for people. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are intended solely to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following descriptions to avoid unnecessary confusion regarding the concepts of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," and "top / bottom" and other terms indicating positions or locations are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner, and therefore should not be construed as limitations of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Currently available fire-resistant cables, such as those in Chinese patent CN202210327656.9, use mica tape to wrap the fire-resistant layer. The mica tape easily absorbs moisture, and the fire-resistant layer has low adhesion when causing a fire. The fire-resistant performance is poor and the fire-resistant structure is weak. In the case of flames, the cable cannot maintain operation for a certain period of time, resulting in blocked lines and inability to alarm in time. In addition, fire elevators, water pumps and smoke exhaust devices cannot operate continuously in the event of an accident, causing serious injuries and losses to people.

[0032] In order to further improve the fire resistance of the cable structure, the present invention has carried out the following Figure 1 The improved design is as follows:

[0033] like Figure 1A fire-resistant cable structure shown includes a cable structure body, in which a plurality of twisted core wire monomers 100 are arranged. In order to improve the overall conductive efficiency, the plurality of twisted core wire monomers 100 are a first core wire monomer 110, a second core wire monomer 120, a third core wire monomer 130, a fourth core wire monomer 140 and a fifth core wire monomer 150 arranged around the center of a circle.

[0034] Each core wire monomer includes a copper conductor 1 arranged coaxially from the inside to the outside, and the copper conductor 1 is a copper conductor with a tinned surface. The tinning surface is mainly to increase the conductive performance of the conductor.

[0035] The three-layer structure comprises a fire-resistant oxygen-isolating structural layer 2 wrapped on the outer radial surface of the copper conductor 1 and an insulating structural layer 3 wrapped on the outer radial surface of the fire-resistant oxygen-isolating structural layer 2 , and together constitutes a single core wire monomer 100 .

[0036] Among them, the fire-resistant and oxygen-isolating structural layer 2 mainly plays the role of fire resistance and oxygen isolation. The fire-resistant and oxygen-isolating structural layer in the utility model is a ceramic silicone rubber fireproof cloth wrapped with a composite tape. The wrapping method adopts layer-by-layer covering. The thickness of the wrapping tape is 0.2-0.8mm, and the wrapping is 3-6 layers. The specific selection can be made according to the actual size requirements.

[0037] The insulating structural layer 3 in this invention is made of flame-retardant ceramic polyolefin (HPCC). HPCC, a thermoplastic material, is a modified form of polyolefin. HPCC not only exhibits excellent flame retardancy but also high-temperature resistance and superior electrical properties, making it widely used in electronics, automotive, and aircraft applications.

[0038] In order to further increase the stability and fire resistance of the overall structure, a first wrapping structure layer 5 is arranged outside the several twisted core wire monomers 100, and a second wrapping structure layer 6 is wrapped on the outer radial surface of the first wrapping structure layer 5. In order to increase the stability and fire resistance between the several twisted core wire monomers 100, a filler 4 is arranged between the several twisted core wire monomers 1.

[0039] The filler 4 in the present invention is glass fiber, which can be filamentous glass fiber or other shapes. It mainly plays a filling role, fills tightly and roundly without leaving any gaps to prevent oxygen from entering.

[0040] The first wrapped structural layer 5 of the present invention is a ceramic fireproof composite tape, which has ceramic fire-resistant properties and can quickly harden under high temperature or flame conditions to form a hard ceramic layer for fire-resistant protection.

[0041] Ceramic fireproof composite tape is made of ceramic fire-resistant silicone rubber and high-temperature resistant glass fiber cloth by calendering. It has high fire resistance and a temperature resistance level of up to 800-1000℃, allowing the cable to continue to provide power in fire conditions close to the melting point of copper (1083℃). It does not spread outward when burning and is not easy to burn.

[0042] The second wrapped structural layer 6 in the present invention is a glass fiber tape, which is woven from glass fiber yarns with a weaving density of 100%.

[0043] An inner protective structure layer 7 with a thickness of 0.8-1.5 mm is wrapped around the outer radial surface of the second wrapping structure layer 6 , and an outer protective structure layer 8 with a thickness of 1.8-3.5 mm is wrapped around the outer radial surface of the inner protective structure layer 7 .

[0044] The inner protective structure layer 7 of the present invention is a polyolefin resin mixed with a halogen-free flame retardant, specifically a low-smoke halogen-free flame retardant polyolefin. The cable material prepared by the low-smoke halogen-free flame retardant polyolefin is based on polyolefin resin, and is added with high-quality and efficient halogen-free flame retardants and other processing aids. It is made by mixing, plasticizing and granulating. It not only has excellent mechanical and physical properties, oil resistance, electrical properties, flame retardant properties and processing technology performance, but also has the characteristics of being halogen-free and having low smoke emission. It is suitable for power cables, control cables, marine cables, optical cables, signal cables, etc.

[0045] The outer protective structure layer of the utility model is a flame retardant B1 grade polyolefin resin, and the flame retardant B1 grade polyolefin resin is a flame retardant B1 grade polyolefin sheath material, which can be a polyolefin resin material that can reach the flame retardant B1 grade as prepared by CN201911415305.8 or other formulas. It has excellent anti-cracking performance, mechanical and physical properties, processing performance, and has excellent combustion crust performance, further ensuring the stability of the cable combustion performance.

[0046] The basic principles and main features of the utility model and the advantages of the utility model are shown and described above.

[0047] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A fire-resistant cable structure, characterized in that: include: A cable structure body, in which a plurality of twisted core wire units are arranged, wherein the core wire units include a copper conductor arranged coaxially from the inside to the outside, a fire-resistant oxygen-isolating structural layer wrapped around the radial surface of the copper conductor, and an insulating structural layer wrapped around the radial surface of the fire-resistant oxygen-isolating structural layer; A first wrapping structure layer is provided outside the plurality of twisted core wire monomers, and a second wrapping structure layer is wrapped around the outer radial surface of the first wrapping structure layer; An inner protective structure layer is wrapped around the outer radial surface of the second wrapping structure layer; An outer protective structure layer is wrapped around the outer radial surface of the inner protective structure layer; A filler is provided between the plurality of twisted core wire monomers; The fire-resistant and oxygen-isolating structural layer is formed by wrapping ceramic silicone rubber fireproof cloth with a composite tape, the wrapping method is layer by layer, the wrapping tape thickness is 0.2-0.8mm, and the wrapping is 3-6 layers; The insulating structure layer is made of flame-retardant ceramic polyolefin HPCC material; The filler is glass fiber; The first wrapping structure layer is a ceramic fireproof composite tape, The second wrapping structure layer is a glass fiber tape, The inner protective structure layer is a polyolefin resin mixed with a halogen-free flame retardant. The outer protective structure layer is made of flame retardant B1 grade polyolefin resin.

2. A fire-resistant cable structure according to claim 1, characterized in that: The copper conductor is a copper conductor with a tinned surface.

3. A fire-resistant cable structure according to claim 1, characterized in that: The plurality of twisted core wire monomers are a first core wire monomer, a second core wire monomer, a third core wire monomer, a fourth core wire monomer and a fifth core wire monomer arranged around the center of a circle.

4. A fire-resistant cable structure according to claim 1, characterized in that: The wrapping overlap rate of the ceramic fireproof composite tape is greater than 30%.

5. A fire-resistant cable structure according to claim 1, characterized in that: The glass fiber tape is woven from glass fiber filaments, and the weaving density is 100%.

6. A fire-resistant cable structure according to claim 1, characterized in that: The polyolefin resin mixed with the halogen-free flame retardant is a low-smoke halogen-free flame retardant polyolefin, and the thickness of the inner protective structure layer is 0.8-1.5 mm.

7. A fire-resistant cable structure according to claim 1, characterized in that: The flame retardant B1 grade polyolefin resin is a flame retardant B1 grade polyolefin sheath material, and the thickness of the outer protective structure layer is 1.8-3.5 mm.

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