Copper core cross-linked polyethylene insulating sheath with flame-retardant effect

Abstract

The utility model discloses a copper core cross-linked polyethylene insulating sheath with a flame retardant effect, comprising a sheath body, the sheath body is composed of an inner sheath, a middle sheath and an outer sheath which are sequentially distributed from inside to outside, the inner sheath, the middle sheath and the outer sheath are coaxial, the outer part of the inner sheath is provided with a compression resistant layer used for supporting the inner sheath, and the outer part of the outer sheath is provided with a flame retardant layer. A protection layer for shielding and insulating heat of the copper core is arranged in the inner sheath, a reinforcing layer is arranged in the middle sheath, a flame-retardant layer is arranged in the outer sheath, the flame-retardant layer comprises a flame-retardant sleeve arranged in the middle of the outer sheath, and a flame-retardant wrapping tape is wound on the outer surface of the flame-retardant sleeve. By arranging the first fireproof coating, the second fireproof coating and the flame-retardant layer, the amount of combustible gas can be reduced when the sleeve body is under the condition of high temperature or open fire, the possibility of combustion of the sleeve body is reduced, and the overall safety is improved; by arranging the compression-resistant layer, the protective layer and the reinforcing layer, the overall compressive strength of the sleeve body can be improved, and the sleeve body is prevented from being damaged in a severe environment.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to a copper core cross-linked polyethylene insulating sheath with flame-retardant properties. Background Technology

[0002] Copper-core cross-linked polyethylene (XLPE) insulation sheath refers to a power cable structure that uses copper as the conductor, cross-linked polyethylene as the insulation layer, and a specific material (such as polyethylene, polyvinyl chloride, or polyolefin) as the sheath. The XLPE insulation layer has high insulation resistance and dielectric properties, ensuring that the cable maintains good electrical performance during long-term operation.

[0003] While existing cross-linked polyethylene (XLPE) insulation sheaths possess high heat resistance and aging resistance, their molecular chains may still break under high temperature or open flame conditions, generating flammable gases. These gases will ignite rapidly upon contact with an open flame or high-temperature heat source, causing the fire to spread. Therefore, the flame-retardant properties of XLPE insulation sheaths are relatively limited. To address this, a copper-core XLPE insulation sheath with flame-retardant properties is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a copper core cross-linked polyethylene insulating sheath with flame-retardant properties to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A copper core cross-linked polyethylene insulating sheath with flame-retardant effect includes a sheath body, which is composed of an inner sheath, a middle sheath, and an outer sheath distributed sequentially from the inside to the outside, and the inner sheath, middle sheath, and outer sheath are coaxial. The outer side of the inner sheath is provided with a pressure-resistant layer for supporting the inner sheath, and the inner side of the inner sheath is provided with a protective layer for shielding and heat insulation of the copper core. The inner side of the middle sheath is provided with a reinforcing layer, and the inner side of the outer sheath is provided with a flame-retardant layer. The flame-retardant layer includes a flame-retardant sleeve disposed in the middle of the outer sheath, and the outer surface of the flame-retardant sleeve is wrapped with flame-retardant tape.

[0006] Preferably, the pressure-resistant layer includes a metal mesh wound around the outer surface of the inner sheath, and a mica wrapping tape disposed on the outer surface of the metal mesh for wrapping and fixing the metal mesh, wherein the metal mesh is made of aluminum.

[0007] Preferably, the protective layer includes a heat insulation sleeve disposed in the middle of the inner sheath, and a shielding tape wrapped around the outer surface of the heat insulation sleeve. The heat insulation sleeve is made of silicone material, and the shielding tape is a semi-conductive nylon tape.

[0008] Preferably, the reinforcing layer includes a metal shaped flexible tube disposed in the middle of the inner sheath, a filling cavity is provided between the metal shaped flexible tube and the inner sheath, and the filling cavity is filled with filling cotton, the filling cotton being glass wool, and an insulating tape for wrapping and merging the filling cotton is wrapped around the outer surface of the filling cotton, the insulating tape being fiberglass tape, and the outer surface of the inner sheath is coated with a first fire-retardant coating, the first fire-retardant coating being an epoxy intumescent fire-retardant coating.

[0009] Preferably, the flame-retardant sleeve is made of silicone material, the flame-retardant strap is silicone rubber coated cloth, and the outer surface of the outer sheath is coated with a second fire-retardant coating, which is a wood structure fire-retardant coating.

[0010] Compared with the prior art, the beneficial effects of this utility model are: a copper core cross-linked polyethylene insulating sheath with flame-retardant properties,

[0011] 1. By setting a first fireproof coating, a second fireproof coating, and a flame-retardant layer, this utility model can reduce the amount of flammable gas in the casing under high temperature or open flame conditions, reduce the possibility of combustion, and improve overall safety.

[0012] Second: By setting up a compressive strength layer, a protective layer and a reinforcing layer, this utility model can improve the overall compressive strength of the sleeve, prevent it from being damaged in harsh environments, and further improve its flame retardant performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 100, sheath; 200, inner sheath; 201, shielding tape; 202, heat insulation sheath; 203, metal mesh; 204, mica tape; 300, middle sheath; 301, insulating tape; 302, filling cotton; 303, metal shaping hose; 400, outer sheath; 401, flame retardant sheath; 402, flame retardant tape. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a copper core cross-linked polyethylene insulating sheath with flame retardant effect, including a sheath body 100, wherein the sheath body 100 is composed of an inner sheath 200, a middle sheath 300 and an outer sheath 400 distributed sequentially from the inside to the outside, and the inner sheath 200, the middle sheath 300 and the outer sheath 400 are coaxial, and the inner sheath 200, the middle sheath 300 and the outer sheath 400 are all made of cross-linked polyethylene material.

[0020] Specifically, the inner sheath 200 has an external pressure-resistant layer for supporting it, and an internal protective layer for shielding and insulating the copper core. The pressure-resistant layer includes a metal mesh 203 wrapped around the outer surface of the inner sheath 200, which improves the overall pressure resistance of the inner sheath 200, and a mica wrapping tape 204 on the outer surface of the metal mesh 203 for wrapping and fixing it. The metal mesh 203 is made of aluminum. The protective layer includes a heat-insulating sleeve 202 in the middle of the inner sheath 200, and a shielding tape 201 wrapped around the outer surface of the heat-insulating sleeve 202. The heat-insulating sleeve 202 is made of silicone, and the shielding tape 201 is a semi-conductive nylon tape with good insulation performance and mechanical strength.

[0021] Specifically, the inner sheath 300 has a reinforcing layer, which includes a metal shaped flexible tube 303 located in the middle of the inner sheath 300. This layer retains the bending performance of the power cable and further improves the overall compressive strength. A filling cavity is provided between the metal shaped flexible tube 303 and the inner sheath 300, and the cavity is filled with filler cotton 302, which is glass wool. The outer surface of the filler cotton 302 is wrapped with insulating tape 301, which is fiberglass tape, to wrap and merge the filler cotton 302. The outer surface of the inner sheath 300 is coated with a first fire-retardant coating, which is an epoxy intumescent fire-retardant coating. When heated, it expands and foams to form a carbonized foam insulation layer or a carbonaceous foam heat insulation layer, which delays the transfer of heat to the substrate and prevents the object from igniting or reduces its combustion intensity.

[0022] Specifically, the outer sheath 400 has a flame-retardant layer inside, which includes a flame-retardant sleeve 401 in the middle of the outer sheath 400. The flame-retardant sleeve 401 is made of silicone material, and a flame-retardant wrapping tape 402 is wrapped around the outer surface of the flame-retardant sleeve 401. The flame-retardant wrapping tape 402 is a silicone rubber coated cloth. The outer surface of the outer sheath 400 is coated with a second fire-retardant coating. The second fire-retardant coating is a wood structure fire-retardant coating, which decomposes into non-combustible inert gas when heated, diluting the combustible gas decomposed by the protected object when heated, making it less likely to burn or slowing down the burning speed.

[0023] Based on the above, by setting a first fireproof coating, a second fireproof coating, and a flame-retardant layer, this utility model can reduce the amount of flammable gas in the sleeve 100 under high temperature or open flame conditions, reduce its possibility of combustion, and improve overall safety; by setting a compressive strength layer, a protective layer, and a reinforcing layer, this utility model can improve the overall compressive strength of the sleeve 100, prevent it from being damaged in harsh environments, and further improve its flame-retardant performance.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

Claims

1. A copper core cross-linked polyethylene insulating sheath with flame-retardant properties, comprising a sheath body (100), characterized in that: The sleeve (100) is composed of an inner sheath (200), a middle sheath (300) and an outer sheath (400) arranged sequentially from the inside to the outside. The inner sheath (200), the middle sheath (300) and the outer sheath (400) are coaxial. The outer side of the inner sheath (200) is provided with a pressure-resistant layer for supporting the inner sheath (200). The inner side of the inner sheath (200) is provided with a protective layer for shielding and heat insulation of the copper core. The inner side of the middle sheath (300) is provided with a reinforcing layer. The inner side of the outer sheath (400) is provided with a flame-retardant layer. The flame-retardant layer includes a flame-retardant sleeve (401) disposed in the middle of the outer sheath (400). The outer surface of the flame-retardant sleeve (401) is wrapped with flame-retardant wrapping tape (402).

2. The copper core cross-linked polyethylene insulating sheath with flame-retardant effect according to claim 1, characterized in that: The pressure-resistant layer includes a metal mesh (203) wrapped around the outer surface of the inner sheath (200) and a mica wrapping tape (204) disposed on the outer surface of the metal mesh (203) for wrapping and fixing the metal mesh (203), the metal mesh (203) being made of aluminum.

3. The copper core cross-linked polyethylene insulating sheath with flame-retardant effect according to claim 1, characterized in that: The protective layer includes a heat insulation sleeve (202) disposed in the middle of the inner sheath (200) and a shielding tape (201) wrapped around the outer surface of the heat insulation sleeve (202). The heat insulation sleeve (202) is made of silicone material and the shielding tape (201) is a semi-conductive nylon tape.

4. A copper core cross-linked polyethylene insulating sheath with flame-retardant effect according to claim 1, characterized in that: The reinforcing layer includes a metal shaped hose (303) disposed in the middle of the middle sheath (300), a filling cavity is provided between the metal shaped hose (303) and the middle sheath (300), and the filling cavity is filled with filling cotton (302), the filling cotton (302) is glass wool, and the outer surface of the filling cotton (302) is wrapped with insulating tape (301) for wrapping and merging the filling cotton (302), the insulating tape (301) is glass fiber tape, and the outer surface of the middle sheath (300) is coated with a first fireproof coating, the first fireproof coating is an epoxy intumescent fireproof coating.

5. A copper core cross-linked polyethylene insulating sheath with flame-retardant effect according to claim 1, characterized in that: The flame-retardant sleeve (401) is made of silicone material, the flame-retardant wrapping tape (402) is silicone rubber coated cloth, and the outer surface of the outer sheath (400) is coated with a second fire-retardant coating, which is a wood structure fire-retardant coating.

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