Cross-linked polyolefin insulated high-temperature-resistant fireproof cable

Abstract

The utility model discloses a cross-linked polyolefin insulated high-temperature-resistant fireproof cable, which comprises a cable core, three annularly distributed wire cores are arranged inside the cable core, the wire cores are mutually twisted, a composite cross-linked polyolefin insulating layer is wrapped outside the cable core, the composite cross-linked polyolefin insulating layer is composed of a basic insulating layer and a supporting layer, and the basic insulating layer and the supporting layer are mutually twisted. The composite cross-linked polyolefin insulating layer is wrapped by a flame-retardant layer, the flame-retardant layer is composed of an isolating layer, an expansion layer and a polymer composite layer, an armor layer is arranged outside the flame-retardant layer, the armor layer is composed of a metal wire braid layer and a metal belt wrapping layer, a composite outer sheath is arranged outside the armor layer, and the composite outer sheath is arranged outside the metal wire braid layer. The problem that the electrical performance of the cable may be reduced due to thermal aging in a high-temperature environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a cross-linked polyolefin insulated high temperature resistant and fireproof 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. They are all made up of multiple strands of thin wires and are covered with an insulating rubber skin. Cables are usually rope-like cables made of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a center. The entire outer layer is covered with a highly insulating covering. Cables have the characteristics of being powered inside and insulated outside.

[0003] For example, the Chinese authorized patent "A fire-proof cable" with announcement number CN220456129U includes: a wire core, which is provided with two twisted wire cores with good insulation effect; a filling layer, which is wrapped around the outside of the two wire cores; a sheath, which is arranged on the outside of the filling layer for protection; and a buffer component, which is arranged between the filling layer and the sheath.

[0004] However, the cables may be subjected to various external physical damages and mechanical pressures during use, which may easily lead to cable damage or performance degradation. Moreover, in high temperature environments, traditional cable insulation materials may cause electrical performance degradation due to thermal aging, or even cause insulation failure. Therefore, they do not meet existing needs. In this regard, we have proposed cross-linked polyolefin insulated high-temperature resistant and fire-resistant cables. Utility Model Content

[0005] The utility model aims to provide a cross-linked polyolefin insulated high temperature resistant fireproof cable to solve the problem that the electrical performance of the cable proposed in the above background technology may be degraded due to thermal aging in a high temperature environment.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a cross-linked polyolefin insulated high-temperature resistant fireproof cable, comprising a cable core, wherein the interior of the cable core is provided with three annularly distributed wire cores, and the wire cores are twisted together, and the exterior of the cable core is wrapped with a composite cross-linked polyolefin insulation layer, wherein the composite cross-linked polyolefin insulation layer is composed of a basic insulation layer and a supporting layer, and the exterior of the composite cross-linked polyolefin insulation layer is wrapped with a flame retardant layer, wherein the flame retardant layer is composed of an isolation layer, an expansion layer and a polymer composite layer, and the exterior of the flame retardant layer is provided with an armor layer, wherein the armor layer is composed of a metal wire braided layer and a metal tape wrapped layer, and the exterior of the armor layer is provided with a composite outer sheath.

[0007] Preferably, the wire core includes a conductor, and the conductor is formed by twisting a plurality of copper wires. The conductor is wrapped with a sheath on the outside, and the sheath and the conductor are extruded into a shape.

[0008] Preferably, a filler is provided in the gap between the wire core and the cable core.

[0009] Preferably, the basic insulation layer is located at the innermost side of the composite cross-linked polyolefin insulation layer, and the basic insulation layer is in contact with the cable core, and the support layer is braided and formed outside the basic insulation layer.

[0010] Preferably, the isolation layer is in contact with the outer side of the composite cross-linked polyolefin insulation layer, the expansion layer is coated and formed on the outside of the isolation layer, and the polymer composite layer is wrapped on the outside of the expansion layer.

[0011] Preferably, the metal wire braided layer is formed by weaving a plurality of metal wires into a mesh structure, and the metal wire braided layer is wrapped around the outside of the flame retardant layer, and the metal belt wrapping layer is wrapped around the outside of the metal wire braided layer.

[0012] Preferably, the composite outer sheath comprises an inner sheath, and the inner sheath and the armor layer are extruded and formed, the outer wall of the inner sheath is provided with a central reinforcement layer, and the outer side of the central reinforcement layer is provided with an outer sheath.

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

[0014] 1. The utility model adopts cross-linked polyolefin material as the basic insulating material. The composite cross-linked polyolefin insulation layer has extremely high insulation strength and electrical properties, which can effectively prevent the occurrence of problems such as current leakage and short circuit. In addition, the cross-linked polyolefin material itself has high heat resistance. After cross-linking treatment, its high temperature resistance is further improved, and it can maintain stable insulation performance in high temperature environment. The setting of the reinforcement layer makes the insulation layer have higher mechanical strength and wear resistance, can resist external physical damage and mechanical pressure, and extend the service life of the cable.

[0015] 2. The utility model is provided with a flame retardant layer, which can quickly take effect when the cable encounters a fire source, slow down the spread of flames, reduce the damage of the fire to the cable and the surrounding environment, and enable the cable to maintain stable operation for a long time when a fire occurs, providing valuable time for fire extinguishing and personnel evacuation. Since the flame retardant layer can effectively protect the internal structure of the cable from flame erosion, it can reduce cable damage and replacement costs caused by fire.

[0016] 3. The utility model significantly improves the mechanical strength of the cable by providing an armor layer, a combination of a metal wire braided layer and a metal tape wrapped layer, so that it can resist external physical damage and mechanical pressure, ensuring the stable operation of the cable in complex environments. The armor layer can not only enhance the mechanical strength of the cable, but also provide a certain protective effect to protect the insulation layer and conductor inside the cable from damage. It also has good conductivity, can effectively shield external electromagnetic interference, and improve the electromagnetic performance of the cable. By enhancing the mechanical strength and protection capability of the cable, the armor layer can reduce the risk of cable failure caused by external factors to a certain extent. 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 structure of the composite cross-linked polyolefin insulation layer of the utility model;

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

[0021] Figure 5 This is a schematic diagram of the armor layer structure of the utility model;

[0022] Figure 6 This is a schematic diagram of the composite outer sheath structure of the utility model.

[0023] In the figure: 1. cable core; 2. filler; 3. wire core; 31. sheath; 32. conductor; 4. composite cross-linked polyolefin insulation layer; 41. basic insulation layer; 42. support layer; 5. flame retardant layer; 51. isolation layer; 52. expansion layer; 53. polymer composite layer; 6. armor layer; 61. metal wire braided layer; 62. metal tape wrapped layer; 7. composite outer sheath; 71. inner sheath; 72. center reinforcement layer; 73. outer sheath. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-6The utility model provides an embodiment: a cross-linked polyolefin insulated high temperature resistant fireproof cable, comprising a cable core 1, wherein three annularly distributed wire cores 3 are arranged inside the cable core 1, and the wire cores 3 are twisted with each other, and the outside of the cable core 1 is wrapped with a composite cross-linked polyolefin insulation layer 4, which is composed of a basic insulation layer 41 and a supporting layer 42, and the outside of the composite cross-linked polyolefin insulation layer 4 is wrapped with a flame retardant layer 5, which is composed of an isolation layer 51, an expansion layer 52 and a polymer composite layer 53, and the outside of the flame retardant layer 5 is provided with an armor layer 6, which is composed of a metal wire braided layer 61 and a metal tape wrapped layer 62, and the outside of the armor layer 6 is provided with a composite outer sheath 7.

[0026] The composite cross-linked polyolefin insulation layer 4 adopts a multi-layer structure design to improve the insulation performance, high temperature resistance and fire resistance of the cable. The flame retardant layer 5 mainly improves the overall flame retardant performance of the cable. The armor layer 6 is intended to enhance the mechanical strength and protection capability of the cable, and at the same time forms a good synergistic effect with the cross-linked polyolefin insulation layer and the composite outer sheath. The composite outer sheath is an important component of the cross-linked polyolefin insulated high temperature resistant and fireproof cable, and is intended to provide excellent physical protection, environmental tolerance and fire resistance.

[0027] See also Figure 1 and Figure 2 The core 3 includes a conductor 32 , and the conductor 32 is formed by twisting a plurality of copper wires. The conductor 32 is wrapped with a sheath 31 outside, and the sheath 31 and the conductor 32 are extruded.

[0028] See also Figure 1 and Figure 2 A filler 2 is provided in the gap between the wire core 3 and the cable core 1.

[0029] See also Figure 3 The basic insulating layer 41 is located at the innermost side of the composite cross-linked polyolefin insulating layer 4, and the basic insulating layer 41 is in contact with the cable core 1. The supporting layer 42 is woven and formed on the outside of the basic insulating layer 41. The basic insulating layer 41 is a cross-linked polyolefin material. The cross-linking technology is used to form a three-dimensional network structure between the molecular chains to improve the heat resistance, aging resistance and electrical properties of the insulating layer. The supporting layer 42 is aramid fiber to enhance the mechanical strength and wear resistance of the insulating layer.

[0030] See also Figure 4The isolation layer 51 is in contact with the outer side of the composite cross-linked polyolefin insulation layer 4, the expansion layer 52 is coated and formed on the outside of the isolation layer 51, and the polymer composite layer 53 is wrapped on the outside of the expansion layer 52. The isolation layer 51 is a ceramic fireproof material, which can form a hard ceramic layer at high temperature and has excellent fire resistance. It can effectively protect the internal structure of the cable from flame erosion. The expansion layer 52 is an intumescent flame retardant, which will expand when heated to form a porous carbonized layer, which can isolate oxygen and heat, thereby effectively preventing the spread of flames. The polymer composite layer 53 achieves the purpose of flame retardancy by uniformly dispersing the inorganic flame retardant-magnesium hydroxide in the polymer matrix, and the endothermic decomposition and the generated water vapor and other non-combustible gases when heated dilute the combustible gas.

[0031] See also Figure 5 The metal wire braided layer 61 is woven into a mesh structure by multiple metal wires, and the metal wire braided layer 61 is wrapped around the outside of the flame retardant layer 5. The metal tape wrapped layer 62 is wrapped around the outside of the metal wire braided layer 61. The metal wire braided layer 61 is stainless steel wire, which mainly serves to enhance the mechanical strength and tensile and extrusion resistance of the cable. The metal tape wrapped layer 62 is aluminum tape, which has a light weight and good corrosion resistance. It is suitable for occasions with high requirements on weight and corrosion resistance to provide additional mechanical protection and electromagnetic shielding effect.

[0032] See also Figure 6 The composite outer sheath 7 includes an inner sheath 71, and the inner sheath 71 is extruded with the armor layer 6. The outer wall of the inner sheath 71 is provided with a central reinforcement layer 72, and the outer sheath 73 is provided outside the central reinforcement layer 72. The inner sheath 71 is a thermoplastic elastomer, which has good flexibility and adhesion, can fit the armor layer tightly, and provide certain heat-resistant protection. The central reinforcement layer 72 is polyester fiber, which has excellent mechanical properties and corrosion resistance, and can effectively enhance the overall strength of the cable. The outer sheath 73 is ceramic silicone rubber, which mainly bears the task of resisting external environmental erosion and fire prevention, has excellent heat resistance and flame retardancy, and can also resist the erosion of chemical substances, providing comprehensive protection for the cable;

[0033] The materials selected for the composite outer sheath 7 have high heat resistance, can maintain stable operation of the cable in a high temperature environment, and reduce the risk of failure caused by high temperature. By adopting materials with excellent flame retardant properties, the composite outer sheath can effectively delay the spread of flames when the cable encounters a fire source, thereby buying time for fire extinguishing and personnel evacuation. The addition of a central reinforcement layer improves the overall mechanical strength of the cable, enabling it to resist external physical damage and mechanical pressure. At the same time, it has chemical corrosion resistance and weather resistance, and can resist the erosion of the cable by chemicals in the external environment and adverse climatic conditions.

[0034] 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 polyolefin insulated high temperature resistant fireproof cable, comprising a cable core (1), characterized in that: The cable core (1) is provided with three annularly distributed wire cores (3) inside, and the wire cores (3) are twisted together. The cable core (1) is wrapped with a composite cross-linked polyolefin insulation layer (4) outside, and the composite cross-linked polyolefin insulation layer (4) is composed of a basic insulation layer (41) and a support layer (42). The composite cross-linked polyolefin insulation layer (4) is wrapped with a flame retardant layer (5) outside, and the flame retardant layer (5) is composed of an isolation layer (51), an expansion layer (52) and a polymer composite layer (53). The flame retardant layer (5) is provided with an armor layer (6) outside, and the armor layer (6) is composed of a metal wire braided layer (61) and a metal tape wrapped layer (62). The armor layer (6) is provided with a composite outer sheath (7) outside.

2. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 1, characterized in that: The wire core (3) comprises a conductor (32), and the conductor (32) is formed by twisting a plurality of copper wires. The conductor (32) is wrapped with a sheath (31) on the outside, and the sheath (31) and the conductor (32) are extruded and formed.

3. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 2, characterized in that: A filler (2) is provided in the gap between the wire core (3) and the cable core (1).

4. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 1, characterized in that: The basic insulation layer (41) is located at the innermost side of the composite cross-linked polyolefin insulation layer (4), and the basic insulation layer (41) is in contact with the cable core (1), and the support layer (42) is braided and formed outside the basic insulation layer (41).

5. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 1, characterized in that: The isolation layer (51) is bonded to the outer side of the composite cross-linked polyolefin insulation layer (4), the expansion layer (52) is coated and formed on the outside of the isolation layer (51), and the polymer composite layer (53) is wrapped on the outside of the expansion layer (52).

6. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 1, characterized in that: The metal wire braided layer (61) is formed by braiding a plurality of metal wires into a mesh structure, and the metal wire braided layer (61) is wrapped around the outside of the flame retardant layer (5), and the metal tape wrapping layer (62) is wrapped around the outside of the metal wire braided layer (61).

7. The cross-linked polyolefin insulated high temperature resistant fireproof cable according to claim 1, characterized in that: The composite outer sheath (7) comprises an inner sheath (71), and the inner sheath (71) and the armor layer (6) are extruded and formed, the outer wall of the inner sheath (71) is provided with a central reinforcement layer (72), and the outer side of the central reinforcement layer (72) is provided with an outer sheath (73).

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