Low-voltage power cable with flame retardant property and long service life

Abstract

The utility model relates to the technical field of low-voltage power cables, in particular to a low-voltage power cable with flame retardant property and long service life, which comprises an outer sleeve layer and a protective device, a plurality of inner sleeve layers are arranged inside the outer sleeve layer, core bodies are arranged in the inner sleeve layers, and the protective device is arranged on the surface of the outer sleeve layer. The protection device comprises a supporting piece, a first adhesive, a second adhesive and a flame-retardant protection layer, the supporting piece is arranged between the inner sleeve layer and the outer sleeve layer, the first adhesive is arranged between the supporting piece and the outer sleeve layer, and the first adhesive and the flame-retardant protection layer are sequentially arranged on the surface of the outer sleeve layer from inside to outside. The flame-retardant protection layer can form efficient multi-layer flame-retardant protection, the survival ability of the cable in a fire disaster is improved, the burning possibility is reduced, the service life is prolonged, meanwhile, the harm to the environment and personnel is reduced, and the supporting piece can improve the overall compression resistance and tensile strength, and the overall service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to low -voltage power cable technical field especially relates to a low -voltage power cable with flame -retardant performance long life. BACKGROUND

[0002] Low -voltage power cable is by the core, insulating layer and the protection layer three parts constitute, the core is used for conducting current, generally by the copper wire or the aluminum wire of multiple strands is twisted, low -voltage cable has single core, double core, three core, four core etc., double core cable is used for single -phase line, three core and four core cable is used for three -phase three -wire system line and three -phase four -wire system line respectively, single core cable can be applied to single -phase system line or three -phase system line as needed.

[0003] Prior art such as the utility model with publication number CN201122455Y, the utility model provides a low -voltage power cable, the cross section structure of this cable includes the main line core conductor of the outer packing insulating layer, the zero line core conductor of the outer packing insulating layer from outside to inside, the main line core conductor cross section shape is tile shape, the zero line core conductor shape is circular, and the tile shape line core forming the main line core conductor is arranged around the circular zero line core conductor, the sheath includes the metal band or metal wire armoring layer in the armored cable, the inner liner and the outer sheath, the effect of the utility model is that the low -voltage power cable using this structure not only can increase the roundness of cable surface, reduce the use amount of cable filling material, but also can obviously reduce the outer diameter of cable, thereby reducing the amount of other materials, effectively control the cost of cable, the cable of this structure can be widely used in electric power, metallurgy, rail transit, petroleum chemical industry, construction engineering etc., solve the current low -voltage power cable only stays on 3+2 and 4+1 structure cable, for 3+1 and 2+1 structure cable, the current practice still follows the traditional problem of the combination of fan shape and circular shape.

[0004] In daily work, it is found that the existing low -voltage power cable has obvious performance defects in the use process, and the performance of the low -voltage power cable is poor in the aspect of resisting combustion, when encountering fire and other emergencies, it is difficult to effectively prevent the spread of fire, and the cable is easily burned out, which may cause a series of serious safety accidents, and the compression resistance and tensile resistance of the low -voltage power cable are also poor, resulting in low overall life. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the shortcomings of poor anti -flame -retardant performance, compression resistance and tensile resistance in the prior art and provides a low -voltage power cable with flame -retardant performance long life.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of low-voltage power cable with high service life of flame-retardant performance, including sheath layer and protection device, the inside of the sheath layer is provided with multiple inner sheath layer, core is provided in the inner sheath layer, the protection device is set on the surface of sheath layer, the protection device includes support, first adhesive, second adhesive, flame-retardant protective layer, the support is located and is set between inner sheath layer and sheath layer, the first adhesive is located and is set between support and sheath layer, the first adhesive and flame-retardant protective layer are sequentially set on the surface of sheath layer from inside to outside, the flame-retardant protective layer includes oxygen barrier layer, inner flame-retardant layer, intumescent flame-retardant layer, outer flame-retardant layer, the oxygen barrier layer, inner flame-retardant layer, intumescent flame-retardant layer, outer flame-retardant layer are sequentially set from outside to inside, the surface of outer flame-retardant layer is fixedly connected with multiple convex stripes, the support includes support ring and support frame, the support frame is fixed in the inside of support ring, and the support frame is arranged in cross shape.

[0007] Preferably, the outer flame-retardant layer is made of polyolefin material, and the thickness of the outer flame-retardant layer is 2-3 mm. Through the above components, the outer flame-retardant layer made of polyolefin material has less smoke and low toxicity when burning, and meets the environmental protection and safety requirements. The outer flame-retardant layer has good flexibility and mechanical strength, and can withstand a certain degree of external force impact and friction.

[0008] Preferably, the intumescent flame-retardant layer includes a fireproof coating layer and a glass fiber fabric layer. The fireproof coating layer is made of a carbonization agent, a foaming agent and a dehydration carbonization catalyst raw material. The glass fiber fabric layer is made of glass fiber. Through the above components, when the intumescent flame-retardant layer is flame-retardant, the fireproof coating layer contains a carbonization agent, a foaming agent and a dehydration carbonization catalyst. When encountering high temperature, the coating will rapidly expand to form a thick porous carbon foam layer. The glass fiber fabric layer plays a role in strengthening and supporting, so that the structure after expansion is more stable and not easy to be damaged.

[0009] Preferably, the thickness of the fireproof coating layer is 2-3 mm, and the thickness of the glass fiber fabric layer is 1-2 mm.

[0010] Preferably, the inner flame-retardant layer is made of ceramicized silicone rubber material, and the thickness of the inner flame-retardant layer is 1.5-2.5 mm. Through the above components, the inner flame-retardant layer made of ceramicized silicone rubber material can resist a certain flame and heat.

[0011] Preferably, the oxygen barrier layer is made of a metalized film, and the thickness of the oxygen barrier layer is 0.1-0.4 mm. Through the above components, the oxygen barrier layer made of a metalized film has very low oxygen permeability, which can effectively prevent oxygen from penetrating into the cable. When the cable catches fire, limiting the supply of oxygen can greatly reduce the speed and intensity of combustion.

[0012] Preferably, the first adhesive and the second adhesive are silicone adhesives, which have excellent high-temperature resistance and can maintain good bonding performance at high temperatures.

[0013] Preferably, the support is made of glass fiber reinforced plastic.

[0014] Compared with the prior art, the utility model has the advantages and positive effects that:

[0015] 1、The utility model discloses a protection device is set up, and the polyolefin material of outer flame -retardant layer has the characteristics of low smoke low toxicity, flexibility and mechanical strength, can prevent the cable skin from being damaged by contacting external objects in daily life, prolongs the service life, and when the fire, as the first line of defense slows down the spread of fire, and its convex strip can reduce the abrasion, the fire -retardant coating layer and glass fiber fabric layer of intumescent flame -retardant layer can insulate heat flame and enhance the support structure under high temperature, and the ceramicized silicone rubber material of inner flame -retardant layer forms a hard shell to resist heat flame, and the metallized film of oxygen -resistant layer prevents oxygen penetration, and mutually cooperate, form high -efficient multilayer flame -retardant protection, improve the survival ability of cable in the fire, reduce the possibility of burning, prolong the service life, reduce the harm to the environment and personnel simultaneously.

[0016] 2、The utility model discloses a support is set up, and the support includes support ring and support frame and is made of glass fiber reinforced plastic, has higher mechanical strength, can bear greater external force, whether in the stretching, bending of cable laying process, or in the extrusion, impact of use process, can effectively protect the cable internal structure, improve the overall strength and life. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A three-dimensional structure schematic diagram of low-voltage power cable with high flame-retardant performance and long service life is provided for the utility model;

[0018] Figure 2 A front view structure schematic diagram of low-voltage power cable with high flame-retardant performance and long service life is provided for the utility model;

[0019] Figure 3 A flame-retardant layer structure schematic diagram of low-voltage power cable with high flame-retardant performance and long service life is provided for the utility model;

[0020] Figure 4 A flame-retardant layer partial structure schematic diagram of low-voltage power cable with high flame-retardant performance and long service life is provided for the utility model;

[0021] Figure 5The utility model provides a kind of support structure schematic diagram of low-voltage power cable with high service life of flame-retardant performance.

[0022] Legend:

[0023] 1, outer jacket layer; 2, inner jacket layer; 3, core; 4, protective device; 41, flame-retardant protective layer; 411, outer flame-retardant layer; 412, intumescent flame-retardant layer; 4121, fire retardant coating layer; 4122, glass fiber fabric layer; 413, inner flame-retardant layer; 414, oxygen barrier layer; 42, convex strip; 43, support; 431, support ring; 432, support frame; 44, first adhesive; 45, second adhesive. DETAILED DESCRIPTION

[0024] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a kind of low-voltage power cable with high service life of flame-retardant performance, including outer jacket layer 1 and protective device 4, the inside of outer jacket layer 1 is provided with multiple inner jacket layers 2, and core 3 is provided in inner jacket layer 2, and protective device 4 is set on the surface of outer jacket layer 1.

[0025] Specifically, protective device 4 includes support 43, first adhesive 44, second adhesive 45, flame-retardant protective layer 41, support 43 is located between inner jacket layer 2 and outer jacket layer 1 and is set, first adhesive 44 is located between support 43 and outer jacket layer 1 and is set, first adhesive 44 and flame-retardant protective layer 41 are sequentially set on the surface of outer jacket layer 1 from inside to outside, flame-retardant protective layer 41 includes oxygen barrier layer 414, inner flame-retardant layer 413, intumescent flame-retardant layer 412, outer flame-retardant layer 411, oxygen barrier layer 414, inner flame-retardant layer 413, intumescent flame-retardant layer 412, outer flame-retardant layer 411 are sequentially set from outside to inside, and the surface of outer flame-retardant layer 411 is fixedly connected with multiple convex strips 42, support 43 includes support ring 431 and support frame 432, support frame 432 is fixed in the inside of support ring 431, and support frame 432 is cross-shaped and is set.

[0026] Specifically, outer flame-retardant layer 411 is made of polyolefin material, and the thickness of outer flame-retardant layer 411 is 2-3mm, the outer flame-retardant layer 411 made of polyolefin material has less smoke and low toxicity when burning, meets environmental protection and safety requirements, has good flexibility and mechanical strength, and can withstand a certain degree of external force impact and friction.

[0027] Specifically, intumescent flame-retardant layer 412 includes fire retardant coating layer 4121 and glass fiber fabric layer 4122, fire retardant coating layer 4121 is made of carbonization agent, foaming agent and dehydration carbonization catalyst raw material, and glass fiber fabric layer 4122 is made of glass fiber.

[0028] In the embodiment, the intumescent fire-retardant layer 412 contains carbonization agent, foaming agent, and dehydration carbonization catalyst and other components when the fire-retardant layer 412 is in the process of fire-retardant. When the temperature is high, the coating will expand rapidly to form a thick porous carbon foam layer. The glass fiber fabric layer 4122 plays a role of reinforcement and support, so that the structure after expansion is more stable and not easy to be damaged.

[0029] Specifically, the thickness of the fire-retardant coating layer 4121 is 2-3mm, and the thickness of the glass fiber fabric layer 4122 is 1-2mm.

[0030] Specifically, the inner fire-retardant layer 413 is made of ceramicized silicone rubber material, and the thickness of the inner fire-retardant layer 413 is 1.5-2.5mm.

[0031] In the embodiment, the inner fire-retardant layer 413 made of ceramicized silicone rubber material can resist certain flame and heat.

[0032] Specifically, the oxygen barrier layer 414 is made of metalized film, and the thickness of the oxygen barrier layer 414 is 0.1-0.4mm. The oxygen barrier layer 414 made of metalized film has very low oxygen transmission rate, which can effectively prevent oxygen from penetrating into the cable. When the cable catches fire, limiting the supply of oxygen can greatly reduce the speed and intensity of burning.

[0033] Specifically, the first adhesive 44 and the second adhesive 45 are organic silicon adhesives.

[0034] In the embodiment, the organic silicon adhesive has excellent high-temperature resistance and can maintain good bonding performance at high temperatures.

[0035] Specifically, the support 43 is made of glass fiber reinforced plastic.

[0036] Working principle: the outer flame-retardant layer 411 is made of polyolefin material with a thickness of 2-3 mm. Its low smoke and low toxicity characteristics can reduce the harm to the environment and personnel in the event of a fire. At the same time, its good flexibility and mechanical strength enable it to resist a certain degree of external impact and friction, protecting the internal cable structure. In daily use, it can prevent the cable sheath from being damaged due to contact with external objects, prolonging the service life of the cable. In emergency situations such as fires, it can also serve as the first line of defense against fire, slowing down the spread of fire. The multiple ridges 42 on the outer flame-retardant layer 411 can reduce the contact surface between the outer flame-retardant layer 411 and objects, reducing wear and tear. The intumescent flame-retardant layer 412 is composed of a 2-3 mm thick fire retardant coating layer 4121 and a 1-2 mm thick glass fiber fabric layer 4122. When exposed to high temperatures, the carbonizing agent, foaming agent, and dehydration carbonization catalyst in the fire retardant coating layer 4121 work together to rapidly expand and form a porous carbon foam layer, effectively insulating heat and flame. The glass fiber fabric layer 4122 strengthens and supports the expanded structure, making it more stable and preventing it from being damaged. The inner flame-retardant layer 413 is made of 1.5-2.5 mm thick ceramicized silicone rubber material. In a high-temperature flame environment, this material can form a ceramic-like hard shell, effectively resisting the transfer of flame and heat to the interior of the cable. It works in conjunction with the intumescent flame-retardant layer 412 and the outer flame-retardant layer 411 to further enhance the cable's flame-retardant ability, forming multiple layers of flame-retardant protection and improving the cable's survival ability in a fire, thereby ensuring the long-term use of the cable. The oxygen barrier layer 414 is made of a 0.1-0.4 mm thick metalized film. Its extremely low oxygen transmission rate can effectively prevent oxygen from penetrating into the interior of the cable during a fire, limiting oxygen supply to significantly reduce the burning speed and intensity. In combination with other layers, the cable's flame-retardant performance in a fire is greatly improved, reducing the likelihood of the cable being destroyed and prolonging its service life.

[0037] In daily use, the support ring 431 in the support piece 43 can withstand a large external force in cooperation with the support frame 432. Whether it is stretching and bending during cable laying or being squeezed and impacted during use, the support frame 432 is fixed in the support ring 431 in a cross shape. This design enables the support piece 43 to provide stable support in all directions, evenly distributing external forces and thus better protecting the cable.

Claims

1. A low voltage power cable with high lifetime and fire retardant properties comprising a jacket layer (1) and a protection means (4), characterized in that: The inner part of the outer layer (1) is provided with a plurality of inner layers (2), the inner layer (2) is provided with a core (3), the protective device (4) is arranged on the surface of the outer layer (1), the protective device (4) comprises a support (43), a first adhesive (44), a second adhesive (45), a flame-retardant protective layer (41), the support (43) is arranged between the inner layer (2) and the outer layer (1), the first adhesive (44) is arranged between the support (43) and the outer layer (1), the first adhesive (44) and the flame-retardant protective layer (41) are sequentially arranged on the surface of the outer layer (1) from inside to outside, the flame-retardant protective layer (41) comprises an oxygen barrier layer (414), an inner flame-retardant layer (413), an intumescent flame-retardant layer (412), and an outer flame-retardant layer (411), the oxygen barrier layer (414), the inner flame-retardant layer (413), the intumescent flame-retardant layer (412), and the outer flame-retardant layer (411) are sequentially arranged from outside to inside, a plurality of convex stripes (42) are fixedly connected to the surface of the outer flame-retardant layer (411), the support (43) comprises a support ring (431) and a support frame (432), the support frame (432) is fixed in the inner part of the support ring (431), and the support frame (432) is arranged in a cross shape.

2. A low voltage power cable with high lifetime and fire retardant properties according to claim 1, characterized in that: The outer flame-retardant layer (411) is made of polyolefin material, and the thickness of the outer flame-retardant layer (411) is 2-3 mm.

3. A low voltage power cable with high life time and fire retardant properties according to claim 1, characterized in that: The intumescent flame-retardant layer (412) comprises a fireproof coating layer (4121) and a glass fiber fabric layer (4122), and the glass fiber fabric layer (4122) is made of glass fiber.

4. A low voltage power cable with high lifetime and fire retardant properties according to claim 3, characterized in that: The thickness of the fireproof coating layer (4121) is 2-3 mm, and the thickness of the glass fiber fabric layer (4122) is 1-2 mm.

5. A low voltage power cable with high life time and fire retardant properties according to claim 1, characterized in that: The inner flame-retardant layer (413) is made of ceramicized silicone rubber material, and the thickness of the inner flame-retardant layer (413) is 1.5-2.5 mm.

6. A low voltage power cable with high life time and fire retardant properties according to claim 1, characterized in that: The oxygen barrier layer (414) is made of a metalized film, and the thickness of the oxygen barrier layer (414) is 0.1-0.4 mm.

7. A low voltage power cable with high life time and fire retardant properties according to claim 1, characterized in that: The first adhesive (44) and the second adhesive (45) are organic silicon adhesives.

8. A low voltage power cable with high life time and fire retardant properties according to claim 1, characterized in that: The support (43) is made of glass fiber reinforced plastic.

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