Flame-retardant, fireproof, waterproof and environment-friendly low-voltage power cable with high mechanical strength

Abstract

The utility model discloses a high-mechanical-strength flame-retardant fireproof waterproof environment-friendly low-voltage power cable, which comprises a cable core, and the periphery of the cable core is sequentially coated with an inner wrapping mineral insulating layer, a concentric conductor, an outer wrapping mineral insulating layer, a corrugated stainless steel sheath layer, a heat insulation protection layer and an outer coating layer from inside to outside. The cable core comprises three main fireproof insulating wire cores, three ground fireproof insulating wire cores and a filler, the three main fireproof insulating wire cores and the three ground fireproof insulating wire cores are uniformly distributed in a crossed manner, the adjacent insulating wire cores are in contact with each other, insulating surfaces far away from the center are tangent to the same large circle, and the filler is located in the center of the cable core. Each insulating wire core comprises a conductor, and the periphery of the conductor is sequentially coated with a protective insulating layer and a split-phase mineral insulating layer from inside to outside. The cable of the utility model has the advantages of high mechanical strength, flame resistance, fire resistance, water resistance, electromagnetic compatibility, anti-interference performance and reliable guarantee, thereby having a long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a flame-retardant, fire-proof, waterproof and environment-friendly low-voltage power cable with high mechanical strength. Background Art

[0002] The typical mineral insulated metal sheathed fireproof cable currently used in three-phase five-wire power distribution systems is mainly made of copper or aluminum, which has the following shortcomings:

[0003] Corrugated copper sheath and corrugated aluminum sheath materials are easily oxidized and blackened when exposed to moisture and gradually corroded and damaged.

[0004] The corrugated copper sheath and corrugated aluminum sheath structures are prone to local deformation and damage under the action of external forces.

[0005] The corrugated copper sheath and corrugated aluminum sheath structures have a periodic change in cross-sectional area from small to large. Their main function is to enhance the mechanical strength of the cable, but they cannot serve as a conductive functional element of the cable, thereby increasing the cost of cable materials and wasting resources.

[0006] The cable has poor moisture and water resistance. When the metal sheath is partially damaged, its sealing performance deteriorates. When external moisture enters the insulation, its insulation performance deteriorates, affecting the reliable operation and service life of the cable. Summary of the Invention

[0007] In order to solve the above problems, the utility model provides a low-voltage power cable with high mechanical strength, flame retardancy, fireproofing, waterproofness and environmental protection.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0009] A high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, comprising a cable core, the outer periphery of which is sequentially coated with an inner overall mineral insulation layer, a concentric conductor, an outer overall mineral insulation layer, a corrugated stainless steel sheath layer, a thermal insulation protective layer and an outer layer from the inside to the outside. The cable core comprises three main fireproof insulation cores, three ground fireproof insulation cores and fillings. The three main fireproof insulation cores and the three ground fireproof insulation cores are evenly distributed crosswise. Adjacent insulation cores are in contact with each other and the insulation surfaces away from the center are tangent to the same large circle. The filling is located in the center of the cable core and is respectively in contact with the three main fireproof insulation cores. The insulation core comprises a conductor, and the outer periphery of the conductor is sequentially coated with a protective insulation layer and a phase-separated mineral insulation layer from the inside to the outside.

[0010] In the above-mentioned high mechanical strength flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the conductor is the first type of solid copper conductor or the second type of twisted copper conductor.

[0011] In the above-mentioned high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the protective insulation layer is formed by overlapping and wrapping polyester tapes.

[0012] In the above-mentioned high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the phase-separated mineral insulation layer is formed by overlapping and wrapping mica tapes on the protective insulation layer.

[0013] In the above-mentioned high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the filler is a mineral rope.

[0014] In the above-mentioned high mechanical strength flame retardant fireproof waterproof environmentally friendly low-voltage power cable, the inner all-inclusive mineral insulation layer is composed of mica tapes wrapped around the cable core in an overlapping manner.

[0015] In the above-mentioned high mechanical strength flame retardant fireproof waterproof environmentally friendly low-voltage power cable, the concentric conductor is formed by longitudinally wrapping a non-magnetic metal tape inside and welding the mineral insulation layer outside.

[0016] In the above-mentioned high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the outer overall mineral insulation layer is composed of mica tapes wrapped around the outside of the concentric conductor.

[0017] In the above-mentioned high mechanical strength flame retardant fireproof waterproof environmentally friendly low-voltage power cable, the corrugated stainless steel sheath layer is formed by longitudinally wrapping a stainless steel strip around the outer mineral insulation layer and welding and corrugating the outer layer.

[0018] In the above-mentioned high mechanical strength flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the thermal insulation protective layer is composed of a halogen-free low-smoke flame retardant glass fiber tape overlapped and wrapped around the corrugated stainless steel sheath layer.

[0019] In the above-mentioned high mechanical strength flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable, the outer layer is an extruded halogen-free low-smoke polyolefin flame retardant outer sheath.

[0020] The beneficial effects of the utility model are:

[0021] The utility model has high mechanical strength, flame retardancy, fire resistance and waterproofness, as well as electromagnetic compatibility, anti-interference and reliable security, and thus has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0025] See also Figure 1 The utility model provides a high mechanical strength flame retardant fireproof waterproof environmentally friendly low-voltage power cable, which is mainly used in high-rise buildings, public places and special places with fire protection requirements, and includes a cable core 300.

[0026] The outer periphery of the cable core 300 is sequentially covered with an inner mineral insulation layer 400, a concentric conductor 500, an outer mineral insulation layer 600, a corrugated stainless steel sheath layer 700, a thermal insulation layer 800 and an outer coating layer 900 from the inside to the outside.

[0027] The cable core 300 includes three main fireproof insulation cores 100, three ground fireproof insulation cores 100 and fillers 200. The three main fireproof insulation cores 100 and the three ground fireproof insulation cores 100 are evenly distributed across each other. This structure is a symmetrical structure, which makes the cable electric field uniform.

[0028] Adjacent insulated cores 100 are in contact with each other and the insulating surfaces away from the center are tangent to the same large circle. The filler 200 is located in the center of the cable core 300 and is in contact with the three main fire-proof insulated cores 100 respectively. In this way, the side gaps of the insulating cores 100 of the cable core 300 are not filled and are relatively round.

[0029] Filled with 200% mineral rope.

[0030] The insulated wire core 100 includes a conductor 110 , and the outer periphery of the conductor 110 is sequentially covered with a protective insulation layer 120 and a phase-separated mineral insulation layer 130 from the inside to the outside.

[0031] The conductor 110 is a first type solid copper conductor or a second type stranded copper conductor.

[0032] The protective insulating layer 120 is formed by overlapping and wrapping polyester tapes. The polyester tape is a thin film with a relatively thin thickness. Even when the cable burns, the heat released by the polyester tape is very small. The polyester tape can effectively protect the conductor 110 from being oxidized.

[0033] Furthermore, the polyester tape has good insulation performance and can enhance the insulation performance of the insulated wire core 100 .

[0034] The phase-separated mineral insulation layer 130 is formed by overlapping and wrapping mica tape on the protective insulation layer 120 .

[0035] The inner mineral insulation layer 400 is formed by overlapping and wrapping the cable core 300 with mica tape.

[0036] The concentric conductor 500 is formed by longitudinally wrapping a non-magnetic metal strip inside and welding the mineral insulation layer 400 outside. The non-magnetic metal strip is specifically one of a copper strip, an aluminum strip, or an aluminum alloy strip. The concentric conductor 500 has good electrical conductivity and can be used as a grounding protection wire of the cable. The structure of the concentric conductor 500 is specifically determined according to the electrical conductivity of the grounding protection wire of the cable.

[0037] The outer mineral insulation layer 600 is made of mica tape wrapped around the concentric conductor 500 in an overlapping manner.

[0038] The corrugated stainless steel sheath layer 700 is formed by longitudinally wrapping a stainless steel strip around the mineral insulation layer 600 and welding and corrugating the outer surface. The corrugated stainless steel sheath layer 700 has high mechanical strength and will not deform or be damaged under external forces, and can effectively protect the various structures therein from being damaged.

[0039] Furthermore, the corrugated stainless steel sheath layer 700 has good corrosion resistance and will not be corroded or damaged when moisture and water enter.

[0040] In addition, the corrugated stainless steel sheath layer 700 has good heat absorption and heat conduction properties, which can effectively prevent the local temperature of the cable from being too high when it burns.

[0041] The thermal insulation protective layer 800 is composed of a halogen-free, low-smoke, flame-retardant glass fiber tape that is overlapped and wrapped around the corrugated stainless steel sheath layer 700. The halogen-free, low-smoke, flame-retardant glass fiber tape has good flame retardant and thermal insulation properties, which reduces the impact of the heat of the corrugated stainless steel sheath layer 700 on the outer sheath during combustion, such as reducing the burning dripping of the outer sheath, reducing the temperature rise of the combustion environment, slowing down the time it takes for the combustion to reach the cable core, and reducing the internal temperature of the cable core.

[0042] The outer layer 900 is an extruded halogen-free low-smoke polyolefin flame retardant outer sheath.

[0043] In some embodiments of this example, the concentric conductor 500 and the corrugated stainless steel sheath layer 700 are metal sheaths with good sealing properties. This sealed double-layer metal sheath has good waterproof performance. The material of the concentric conductor 500 is a non-magnetic metal belt, and the material of the corrugated stainless steel sheath layer 700 is a stainless steel belt. This sealed double-layer metal sheath has good shielding performance, which makes the cable have good electromagnetic compatibility and anti-interference performance.

[0044] In addition, in the high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable given in this example, the phase-separated fireproof insulation layer 130, the inner overall mineral insulation layer 400, and the outer overall mineral insulation layer 600 are all made of mica tape mineral insulation materials. The mica tape has good insulation properties at room temperature, during combustion, and after combustion, which makes the cable have better fire resistance.

[0045] Furthermore, in the high mechanical strength flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable given in this example, the phase-separated fireproof insulation layer 130, the filling 200, the inner overall mineral insulation layer 400, the concentric conductor 500, the outer overall mineral insulation layer 600, the corrugated stainless steel sheath layer 700, the thermal insulation protective layer 800 and the outer layer 900 are all flame retardant materials, and the non-metallic structure is all halogen-free and low-smoke material, which makes the cable have better flame retardant and environmental protection properties.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable with high mechanical strength, characterized by: The cable core comprises a cable core, the outer periphery of which is covered with an inner overall mineral insulation layer, a concentric conductor, an outer overall mineral insulation layer, a corrugated stainless steel sheath layer, a thermal insulation protective layer and an outer coating layer in sequence from the inside to the outside. The cable core comprises three main fireproof insulation cores, three ground fireproof insulation cores and fillings. The three main fireproof insulation cores and the three ground fireproof insulation cores are evenly distributed crosswise. Adjacent insulation cores are in contact with each other and the insulation surfaces away from the center are tangent to the same large circle. The filling is located in the center of the cable core and is in contact with the three main fireproof insulation cores respectively. The insulation core comprises a conductor, and the outer periphery of the conductor is covered with a protective insulation layer and a phase-separated mineral insulation layer in sequence from the inside to the outside.

2. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The conductor is a first type solid copper conductor or a second type stranded copper conductor.

3. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The protective insulating layer is formed by overlapping and wrapping polyester tapes.

4. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The phase-separated mineral insulation layer is formed by overlapping and wrapping mica tapes on a protective insulation layer.

5. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The filling is mineral rope.

6. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The inner all-inclusive mineral insulation layer is made of mica tape wrapped around the cable core in an overlapping manner.

7. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The concentric conductor is formed by longitudinally wrapping a non-magnetic metal strip inside and welding the mineral insulation layer outside.

8. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The outer mineral insulation layer is made of mica tape wrapped around the concentric conductor in an overlapping manner.

9. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The corrugated stainless steel sheath layer is formed by longitudinally wrapping a stainless steel strip around a mineral insulation layer and welding and corrugating the mineral insulation layer.

10. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The heat-insulating protective layer is composed of a halogen-free low-smoke flame-retardant glass fiber tape overlapped and wrapped around the outside of the corrugated stainless steel sheath layer.

11. The high mechanical strength, flame retardant, fireproof, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The outer layer is an extruded halogen-free low-smoke polyolefin flame-retardant outer sheath.

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