Extruded insulation fire-resistant cable

Abstract

The utility model discloses an extruded insulating fire-resistant cable, which relates to the technical field of cables and comprises an outer composite layer, an inner composite layer and a copper conductor core, the inner composite layer is arranged on the outer side of the copper conductor core, the outer composite layer is arranged on the outer side of the inner composite layer, the inner composite layer comprises a copper conductor core coating layer and a metal shielding layer, and the metal shielding layer is arranged on the outer side of the copper conductor core coating layer. The copper conductor core wrapping layer wraps the outer side of the copper conductor core, the metal shielding layer wraps the outer side of the copper conductor core wrapping layer, and the outer composite layer comprises a halogen-free polyethylene insulating layer, a fluorescent layer, a fireproof layer and a corrosion-resistant layer. The anti-biting layer is composed of a steel belt with through holes evenly formed in the surface, when the cable is bitten, due to the arrangement of the steel belt, the teeth of an animal can be prevented from being further inserted into the cable, the animal can only bite the skin of the cable, the cable can be effectively prevented from being bitten by rats, birds and other animals, and the service life of the cable is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an extruded insulated fire-resistant cable. Background Art

[0002] Extruded insulated power cable, also known as rubber-plastic cable, is a power cable with high molecular polymer as insulation. It is made of copper or aluminum wire twisted into a conductor and then extruded with insulation. At present, extruded insulated power cable has been widely used in all aspects of social production and life. Extruded insulated fire-resistant cable is a type of extruded insulated power cable. It is mainly used in high-rise buildings, subways, underground streets, large power stations and important industrial and mining enterprises and other places related to fire safety and fire fighting and lifesaving.

[0003] After searching, patent authorization announcement number CN 212032737 U discloses an extruded insulated fire-resistant cable, which includes a conductor and a shielding layer wrapped around the outside of the conductor. A flexible fireproof layer is provided on the outside of the conductor, and a flame retardant layer is wrapped around the flexible fireproof layer. The flame retardant layer is filled with dry powder particles. The above-mentioned prior art is easily bitten by rodents when used in underground places such as subways and underground streets. It is easily bitten by birds and other terrestrial animals when used in outdoor places such as high-rise buildings and large power stations. Once bitten by animals, it is very easy to expose the battery core, which may cause a short circuit and the risk of fire. Utility Model Content

[0004] The purpose of the utility model is to provide an extruded insulated fire-resistant cable to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An extruded insulated fire-resistant cable comprises an outer composite layer, an inner composite layer and a copper core conductor, wherein the outer side of the copper core conductor is provided with an inner composite layer, and the outer side of the inner composite layer is provided with an outer composite layer, the inner composite layer comprises a copper core conductor covering layer and a metal shielding layer, the copper core conductor covering layer is wrapped around the outer side of the copper core conductor, and the metal shielding layer is wrapped around the outer side of the copper core conductor covering layer, the outer composite layer comprises a halogen-free polyethylene insulation layer, a fluorescent layer, a fire-resistant layer and a corrosion-resistant layer, the fluorescent layer is wrapped around the outer side of the fire-resistant layer, the halogen-free polyethylene insulation layer is wrapped around the outer side of the fire-resistant layer, an anti-bite layer is provided inside the halogen-free polyethylene insulation layer, and the anti-bite layer is a steel belt with through holes uniformly opened on the surface.

[0007] As a further solution of the present invention: a filling layer is provided between the fire-resistant layer and the metal shielding layer, and the filling layer is a flame-retardant particle filling layer.

[0008] As a further solution of the present invention: the fire-resistant layer is formed by directly wrapping the fire-resistant mica tape.

[0009] As a further solution of the present invention: the outer side of the halogen-free polyethylene insulation layer is coated with a corrosion-resistant layer.

[0010] As a further solution of the present invention: the fluorescent layer is a fluorescent powder coating.

[0011] As a further solution of the present invention: the thickness ratio of the halogen-free polyethylene insulation layer, the fluorescent layer and the fire-resistant layer is 5:1:2.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model provides an anti-bite layer within the halogen-free polyethylene insulation layer. The anti-bite layer is composed of a steel strip with through holes evenly opened on the surface. When the cable is bitten, the steel strip can prevent the animal's teeth from further penetrating into the cable, so that the animal can only bite through the cable skin. This can effectively prevent mice, birds and other animals from gnawing on the cable, making the cable have a longer service life and a stronger ability to adapt to the environment.

[0014] 2. The utility model sets a fluorescent layer, which is a fluorescent powder coated on the surface of the fire-resistant layer. When the halogen-free polyethylene insulation layer is completely destroyed, the fluorescent layer will be exposed, which can increase the exposure of the damaged part of the cable, allowing inspection personnel to discover the damaged part early and carry out repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall cross-sectional view of an extruded insulated fire-resistant cable.

[0016] Figure 2 This is a structural diagram of an extruded insulated fire-resistant cable.

[0017] Figure 3 It is an extruded insulated fire-resistant cable Figure 1 Schematic diagram of the structure of the middle anti-bite layer.

[0018] 1. Outer composite layer; 2. Inner composite layer; 3. Copper conductor; 4. Halogen-free polyethylene insulation layer; 5. Fluorescent layer; 6. Fire-resistant layer; 7. Corrosion-resistant layer; 8. Filling layer; 9. Copper conductor covering layer; 10. Metal shielding layer; 11. Anti-bite layer; 12. Through hole. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-2 In the embodiment of the present invention, an extruded insulated fire-resistant cable comprises an outer composite layer 1, an inner composite layer 2 and a copper conductor 3. The outer side of the copper conductor 3 is provided with an inner composite layer 2, and the outer side of the inner composite layer 2 is provided with an outer composite layer 1. The inner composite layer 2 comprises a copper conductor coating layer 9 and a metal shielding layer 10. The copper conductor coating layer 9 is wrapped around the outer side of the copper conductor 3, and the metal shielding layer 10 is wrapped around the outer side of the copper conductor coating layer 9. The outer composite layer 1 comprises a halogen-free polyethylene insulation layer 4, a fluorescent layer 5, a fire-resistant layer 6 and a corrosion-resistant layer. The corrosion layer 7 is wrapped around the outside of the fire-resistant layer 6. The fluorescent layer 5 is a fluorescent powder coating. When the polyethylene insulation layer is partially damaged, the fluorescent layer will be exposed first, which makes it easier for inspection personnel to find the damaged area and deal with it. The halogen-free polyethylene insulation layer 4 is wrapped around the outside of the fire-resistant layer 6. The thickness ratio of the halogen-free polyethylene insulation layer 4, the fluorescent layer 5 and the fire-resistant layer 6 is 5:1:2. This design allows each functional layer to play a corresponding role, making the cable safer to use.

[0021] See also Figure 1 and Figure 3 A bite-proof layer 11 is provided inside the halogen-free polyethylene insulation layer 4. The bite-proof layer 11 is a steel belt with through holes 12 evenly opened on the surface. When in use, when the cable is bitten by rodents, birds or other animals, the bite-proof layer 11 provided inside the halogen-free polyethylene insulation layer 4 can prevent the animal's teeth from further inserting into the cable, so that the animal can only bite through the cable skin, preventing the animal from further biting and protecting the normal operation of the cable.

[0022] See also Figure 1 A filling layer 8 is provided between the fire-resistant layer 6 and the metal shielding layer 10. The filling layer 8 is a flame-retardant particle filling layer. The fire-resistant layer 6 is formed by directly wrapping the fire-resistant mica tape. The setting of the fire-resistant layer 6 can ensure that the cable can maintain safe operation for a certain period of time under flame combustion. The outer side of the halogen-free polyethylene insulation layer 4 is coated with a corrosion-resistant layer 7, and the corrosion-resistant layer 7 is a polyurethane anti-corrosion topcoat.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An extruded insulated fire-resistant cable comprising an outer composite layer (1), an inner composite layer (2) and a copper conductor (3), characterized in that: An inner composite layer (2) is provided on the outer side of the copper conductor core (3), an outer composite layer (1) is provided on the outer side of the inner composite layer (2), the inner composite layer (2) comprises a copper conductor core covering layer (9) and a metal shielding layer (10), the copper conductor core covering layer (9) is wrapped around the outer side of the copper conductor core (3), the metal shielding layer (10) is wrapped around the outer side of the copper conductor core covering layer (9), the outer composite layer (1) comprises a halogen-free polyethylene insulation layer (4), a fluorescent layer (5), a fire-resistant layer (6) and a corrosion-resistant layer (7), the fluorescent layer (5) is wrapped around the outer side of the fire-resistant layer (6), the halogen-free polyethylene insulation layer (4) is wrapped around the outer side of the fire-resistant layer (6), an anti-bite layer (11) is provided inside the halogen-free polyethylene insulation layer (4), and the anti-bite layer (11) is a steel strip with through holes (12) uniformly opened on the surface.

2. The extruded insulated fire-resistant cable according to claim 1, characterized in that: A filling layer (8) is provided between the fire-resistant layer (6) and the metal shielding layer (10), and the filling layer (8) is a flame-retardant particle filling layer.

3. The extruded insulated fire-resistant cable according to claim 1, characterized in that: The fire-resistant layer (6) is formed by directly wrapping the fire-resistant mica tape.

4. The extruded insulated fire-resistant cable according to claim 1, characterized in that: The outer side of the halogen-free polyethylene insulation layer (4) is coated with a corrosion-resistant layer (7).

5. The extruded insulated fire-resistant cable according to claim 1, characterized in that: The fluorescent layer (5) is a fluorescent powder coating.

6. The extruded insulated fire-resistant cable according to claim 1, characterized in that: The thickness ratio of the halogen-free polyethylene insulation layer (4), the fluorescent layer (5) and the fire-resistant layer (6) is 5:1:2.

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