Crosslinked polyethylene insulated fireproof power cable

Abstract

The utility model discloses a cross-linked polyethylene insulated fire-resistant power cable, comprising a composite outer sheath, the composite outer sheath is composed of a protection layer, a reinforcement layer and an inner protection layer, the inner side of the composite outer sheath is provided with a composite fire-resistant layer, the composite fire-resistant layer is composed of a fire-resistant base layer, a reinforcement layer and a sealing layer, the inner side of the composite fireproof layer is provided with a composite insulation shielding layer, the composite insulation shielding layer is composed of an outer semi-conductive layer, an insulation medium layer and an inner semi-conductive layer, the inner side of the composite insulation shielding layer is provided with a cable core, and the cable core is internally provided with at least six groups of wire cores. The problem that a power cable is poor in insulation and fire resistance is solved.

Description

Technical Field

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

[0002] Power cables are an indispensable and important part of the power transmission and distribution system. They carry the key task of transmitting electric energy from power stations to various types of electrical equipment. Power cables are mainly composed of conductors, insulation layers, sheaths and shielding layers. Conductors are usually made of metal materials with high conductivity, such as copper or aluminum, to ensure efficient current transmission. The insulation layer is responsible for isolating the conductor to prevent current leakage and short circuits. It is usually made of materials with good electrical properties and mechanical strength. The sheath protects the cable from damage from the external environment, such as waterproofing, corrosion resistance, and mechanical damage resistance. The shielding layer is used to reduce electromagnetic interference and ensure the stability of cable transmission signals.

[0003] For example, the Chinese authorized patent "A Power Cable" with announcement number CN209496657U includes several cable units, a wrapping tape is arranged on the outside of the several cable units, a filling tape is arranged between the wrapping tape and the several cable units, an inner sheath, an armor layer and an outer sheath are arranged in sequence on the outside of the wrapping tape, each cable unit includes several cores, a metal outer shell layer is arranged on the outside of the several cores, XLPE insulating material is arranged between the metal outer shell layer and the several cores, and an insulating shielding layer and a metal shielding layer are arranged in sequence on the outside of the metal outer shell.

[0004] Although the above-mentioned prior art can realize the transmission of electric power, the traditional power cable materials are easily ignited when encountering short circuit, poor connection, aging of insulation or fire source. These materials have a high heat release rate and a fast flame spread when burning. In addition, when the cable is running for a long time or is affected by harsh environments such as high temperature, its insulation material may age, crack and other problems, resulting in a decrease in insulation performance. Once the insulation performance of the cable fails, it may cause electrical failure or fire accidents. Therefore, it does not meet the existing needs. In this regard, we propose a cross-linked polyethylene insulated fire-resistant power cable. Utility Model Content

[0005] The utility model aims to provide a cross-linked polyethylene insulated fire-resistant power cable to solve the problem of poor fire-resistant performance of the power cable insulation proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cross-linked polyethylene insulated fire-resistant power cable, comprising a composite outer sheath, the composite outer sheath consisting of a protective layer, a reinforcement layer and an inner sheath, a composite fire-resistant layer is arranged on the inner side of the composite outer sheath, the composite fire-resistant layer consists of a fire-resistant base layer, a reinforcement layer and a sealing layer, a composite insulating shielding layer is arranged on the inner side of the composite fire-resistant layer, the composite insulating shielding layer consists of an outer semi-conductive layer, an insulating dielectric layer and an inner semi-conductive layer, a cable core is arranged on the inner side of the composite insulating shielding layer, and at least six groups of wire cores are arranged inside the cable core.

[0007] Preferably, the reinforcement layer is wrapped around the outside of the inner protective layer, and the reinforcement layer and the inner protective layer are formed by extrusion, and the protective layer is wrapped around the outside of the reinforcement layer, and the protective layer and the reinforcement layer are formed by extrusion.

[0008] Preferably, the reinforcement layer is wrapped around the outside of the sealing layer, and the fire-resistant base layer is wrapped around the outside of the reinforcement layer.

[0009] Preferably, the insulating dielectric layer is located outside the inner semiconductive layer, and the insulating dielectric layer and the inner semiconductive layer are extruded, and the outer semiconductive layer is located outside the insulating dielectric layer, and the outer semiconductive layer and the insulating dielectric layer are extruded.

[0010] Preferably, a plurality of annularly distributed copper wires are embedded inside the composite insulating shielding layer.

[0011] Preferably, the wire core includes a conductor, and the conductor is formed by twisting a plurality of copper alloy wires, a coating layer is arranged outside the conductor, and the coating layer and the conductor are extruded, and a conductor shielding layer is arranged outside the coating layer.

[0012] Preferably, a reinforcing core is arranged between the inner sides of adjacent wire cores, and a filler is filled in the gap between the wire core and the reinforcing core.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is provided with a composite outer sheath consisting of a protective layer, a strengthening layer and an inner protective layer. By using excellent electrical performance materials as the inner protective layer, it can ensure the stability of the electrical performance of the cable in complex environments and reduce the performance degradation caused by environmental changes. The setting of the intermediate strengthening layer can significantly improve the overall mechanical strength of the cable, so that it can withstand greater tensile, compression and bending forces, and increase the service life of the cable. The outer protective layer adopts weather-resistant and anti-aging materials, which can resist the erosion of the external environment and ensure the safe and stable operation of the cable in various harsh environments.

[0015] 2. The utility model is provided with a composite fire-resistant layer composed of a fire-resistant base layer, a reinforcement layer and a sealing layer, and adopts materials with high fire-resistant performance, which can maintain stability for a long time in a fire, protect the internal structure of the cable from damage, and ensure the normal operation of the cable in a fire. The setting of the reinforcement layer improves the mechanical strength of the composite fire-resistant layer, so that it can withstand greater external forces and prevent the cable from being damaged due to external forces in a fire. The existence of the sealing layer effectively prevents the penetration of flames and high-temperature gases, maintains the integrity of the cable, and prevents the fire from damaging the internal structure of the cable.

[0016] 3. The utility model is provided with a composite insulating shielding layer composed of an outer semi-conductive layer, an insulating dielectric layer and an inner semi-conductive layer. Through the joint action of the inner semi-conductive layer and the outer semi-conductive layer, the composite insulating shielding layer can effectively eliminate charge accumulation, reduce local electric field strength, and achieve uniform distribution of the electric field inside the cable, thereby improving the electrical performance of the cable. The insulating dielectric layer adopts materials with high insulation performance, which further enhances the insulation performance of the cable and improves the voltage resistance of the cable, so that it can cope with higher voltage levels and more severe operating environments. The setting of the composite insulating shielding layer effectively prevents the electrical breakdown phenomenon that may occur in the cable during operation, reduces the risk of cable failure, and improves the safety performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the composite outer sheath structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the composite refractory layer structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the composite insulating shielding layer structure of the utility model.

[0022] In the figure: 1. composite outer sheath; 11. protective layer; 12. strengthening layer; 13. inner sheath; 2. composite fire-resistant layer; 21. fire-resistant base layer; 22. reinforcement layer; 23. sealing layer; 3. composite insulating shielding layer; 31. outer semi-conductive layer; 32. insulating dielectric layer; 33. inner semi-conductive layer; 4. cable core; 5. cable core; 51. conductor shielding layer; 52. coating layer; 53. conductor; 6. filler; 7. reinforcing core; 8. copper wire. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-5 The utility model provides an embodiment: a cross-linked polyethylene insulated fire-resistant power cable, comprising a composite outer sheath 1, the composite outer sheath 1 is composed of a protective layer 11, a reinforcement layer 12 and an inner sheath 13, a composite fire-resistant layer 2 is arranged on the inner side of the composite outer sheath 1, the composite fire-resistant layer 2 is composed of a fire-resistant base layer 21, a reinforcement layer 22 and a sealing layer 23, a composite insulating shielding layer 3 is arranged on the inner side of the composite fire-resistant layer 2, the composite insulating shielding layer 3 is composed of an outer semi-conductive layer 31, an insulating medium layer 32 and an inner semi-conductive layer 33, a cable core 4 is arranged on the inner side of the composite insulating shielding layer 3, and at least six groups of wire cores 5 are arranged inside the cable core 4.

[0025] The composite outer sheath 1 adopts excellent electrical performance materials as the inner sheath, which can ensure the stability of the electrical performance of the cable in complex environments and reduce the performance degradation caused by environmental changes. The composite fire-resistant layer 2 adopts high fire-resistant materials and can maintain stability for a long time in a fire, protect the internal structure of the cable from damage, and ensure the normal operation of the cable in a fire. The composite insulating shielding layer 3 can effectively eliminate charge accumulation, reduce local electric field strength, and achieve uniform distribution of the electric field inside the cable, thereby improving the electrical performance of the cable.

[0026] See also Figure 3 The strengthening layer 12 is wrapped around the outside of the inner protective layer 13, and the strengthening layer 12 and the inner protective layer 13 are formed by extrusion. The protective layer 11 is wrapped around the outside of the strengthening layer 12, and the protective layer 11 and the strengthening layer 12 are formed by extrusion. The protective layer 11 is polyvinyl chloride, which has good weather resistance, anti-aging, and anti-ultraviolet radiation, provides protection against the external environment, and resists chemical corrosion and mechanical damage. The strengthening layer 12 is polyester fiber, which enhances the overall mechanical strength of the cable and improves its tensile, compression and bending resistance. The inner protective layer 13 is cross-linked polyethylene, which protects the insulation layer from mechanical damage and ensures the stability of electrical performance.

[0027] See also Figure 4 The reinforcement layer 22 is wrapped around the outside of the sealing layer 23, and the fire-resistant base layer 21 is wrapped around the outside of the reinforcement layer 22. The fire-resistant base layer 21 is calcium silicate, which mainly withstands the direct impact of high temperature and flame to protect the internal structure of the cable from damage. The reinforcement layer 22 is glass fiber, which enhances the mechanical strength of the composite fire-resistant layer and prevents cable damage due to external force in a fire. The sealing layer 23 is silica gel, which prevents flames and high-temperature gases from penetrating into the cable and maintains the integrity of the cable.

[0028] See also Figure 5 The insulating dielectric layer 32 is located outside the inner semi-conductive layer 33, and the insulating dielectric layer 32 and the inner semi-conductive layer 33 are extruded, the outer semi-conductive layer 31 is located outside the insulating dielectric layer 32, and the outer semi-conductive layer 31 and the insulating dielectric layer 32 are extruded, the outer semi-conductive layer 31 is ethylene propylene rubber, which can effectively eliminate the charge accumulation on the surface of the insulating layer, reduce the local electric field strength, and prevent the occurrence of electrical breakdown, and together with the inner semi-conductive layer, form a complete shielding system to ensure the uniform distribution of the electric field inside the cable. The insulating dielectric layer 32 is cross-linked polyethylene, which further enhances the insulation performance of the cable and improves the voltage resistance of the cable. The inner semi-conductive layer 33 is a silicone rubber-based semi-conductive compound, which has good conductivity and insulation, can effectively eliminate charge accumulation and reduce electric field strength.

[0029] See also Figure 2 A plurality of annularly distributed copper wires 8 are embedded inside the composite insulating shielding layer 3 to improve the shielding performance of the composite insulating shielding layer 3 .

[0030] See also Figure 2 The core 5 includes a conductor 53, and the conductor 53 is formed by twisting a plurality of copper alloy wires. A coating layer 52 is arranged on the outside of the conductor 53, and the coating layer 52 and the conductor 53 are extruded. A conductor shielding layer 51 is arranged on the outside of the coating layer 52. The conductor shielding layer 51 is made of ethylene propylene rubber, which eliminates the charge accumulation on the surface of the conductor and uniformly distributes the electric field. The coating layer 52 is cross-linked polyethylene. Through the cross-linking modification of polyethylene molecules, the mechanical properties, environmental stress cracking resistance, chemical corrosion resistance and electrical properties of the material are significantly improved.

[0031] See also Figure 2 A reinforcing core 7 is arranged between the inner sides of adjacent wire cores 5 , and a filler 6 is filled in the gap between the wire core 5 and the reinforcing core 7 .

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A cross-linked polyethylene insulated fire-resistant power cable, comprising a composite outer sheath (1), characterized in that: The composite outer sheath (1) is composed of a protective layer (11), a strengthening layer (12) and an inner protective layer (13); a composite fire-resistant layer (2) is arranged on the inner side of the composite outer sheath (1); the composite fire-resistant layer (2) is composed of a fire-resistant base layer (21), a reinforcement layer (22) and a sealing layer (23); a composite insulating shielding layer (3) is arranged on the inner side of the composite fire-resistant layer (2); the composite insulating shielding layer (3) is composed of an outer semi-conductive layer (31), an insulating medium layer (32) and an inner semi-conductive layer (33); a cable core (4) is arranged on the inner side of the composite insulating shielding layer (3); and at least six groups of wire cores (5) are arranged inside the cable core (4).

2. A cross-linked polyethylene insulated fire-resistant power cable according to claim 1, characterized in that: The reinforcing layer (12) is wrapped around the outside of the inner protective layer (13), and the reinforcing layer (12) and the inner protective layer (13) are formed by extrusion; the protective layer (11) is wrapped around the outside of the reinforcing layer (12), and the protective layer (11) and the reinforcing layer (12) are formed by extrusion.

3. A cross-linked polyethylene insulated fire-resistant power cable according to claim 1, characterized in that: The reinforcing layer (22) is wrapped around the outside of the sealing layer (23), and the fire-resistant base layer (21) is wrapped around the outside of the reinforcing layer (22).

4. A cross-linked polyethylene insulated fire-resistant power cable according to claim 1, characterized in that: The insulating dielectric layer (32) is located outside the inner semiconductive layer (33), and the insulating dielectric layer (32) and the inner semiconductive layer (33) are extruded, and the outer semiconductive layer (31) is located outside the insulating dielectric layer (32), and the outer semiconductive layer (31) and the insulating dielectric layer (32) are extruded.

5. A cross-linked polyethylene insulated fire-resistant power cable according to claim 4, characterized in that: A plurality of annularly distributed copper wires (8) are embedded inside the composite insulating shielding layer (3).

6. A cross-linked polyethylene insulated fire-resistant power cable according to claim 1, characterized in that: The wire core (5) comprises a conductor (53), and the conductor (53) is formed by twisting a plurality of copper alloy wires. A coating layer (52) is arranged outside the conductor (53), and the coating layer (52) and the conductor (53) are extruded, and a conductor shielding layer (51) is arranged outside the coating layer (52).

7. A cross-linked polyethylene insulated fire-resistant power cable according to claim 1, characterized in that: A reinforcing core (7) is arranged between the inner sides of adjacent wire cores (5), and a filler (6) is filled in the gap between the wire core (5) and the reinforcing core (7).

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