Flame-retardant cable

Abstract

A flame-retardant cable relates to the technical field of cables and comprises a cable core, three groups of annularly distributed wire cores are arranged inside the cable core, each wire core is composed of a conductor, a conductor shielding layer and an inner insulating layer, a reinforced insulating layer is arranged outside the cable core, the reinforced insulating layer is composed of a basic insulating layer and a nano-composite reinforced layer, and the basic insulating layer and the nano-composite reinforced layer are arranged on the outer side of the cable core. A high-temperature shielding layer is arranged outside the reinforced insulating layer, the high-temperature shielding layer is composed of a high-temperature semi-conductive layer, a high-temperature metal shielding net and a high-temperature protective layer, a flame-retardant sheath is arranged outside the high-temperature shielding layer, and the flame-retardant sheath is composed of an inner-layer flame-retardant base material, a flame-retardant reinforcing layer and an outer protective layer. According to the scheme, the problem that the electrical performance is reduced due to the fact that the cable is easily damaged due to overheating in a high-temperature or fire environment is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technology fields, concretely is a kind of flame-retardant cable. BACKGROUND

[0002] Cable is a kind of wire that is combined by multiple conductive core wires (usually made of copper or aluminum) and wrapped in insulating material. These core wires are electrically isolated from each other and the external environment by an insulating layer to ensure that electric current only flows within the core wires, avoiding short circuits and electric shock risks. Cable usually also contains one or more protective sheaths to provide additional mechanical protection and moisture, fireproofing and other properties. They are widely used in various power transmission, communication, control systems and household appliances, and are one of the indispensable infrastructures in modern society.

[0003] For example, the Chinese authorized patent "Flame-retardant cable" with publication number CN211957211U includes a conductor core, the surface of which is uniformly coated with a fire-resistant paint layer, and the outer surface of the fire-resistant paint layer is wrapped with a fireproof composite cloth woven from flame-retardant fibers. The conductor core is uniformly coated with a fire-resistant paint layer, which is solidified from fire-resistant paint, and has good fire resistance, thereby improving the fire resistance of the conductor core. The fireproof composite cloth is woven from flame-retardant fibers, which have good fire resistance, further enhancing the fire resistance of the conductor core, thereby making the flame-retardant cable made of the conductor core have good flame retardance.

[0004] Although the existing technology has certain flame retardance, it still has deficiencies in electrical stability, heat resistance, and mechanical strength. In particular, in high-temperature or fire environments, traditional cable is prone to damage due to overheating, leading to a decline in electrical performance and even causing fire to spread, posing a serious threat to personnel and property safety. At the same time, traditional cable often releases a large amount of toxic smoke when burning, polluting the environment and not meeting modern environmental protection requirements, thus not meeting the existing needs. Therefore, we propose a flame-retardant cable. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a flame-retardant cable to solve the problem of cable damage due to overheating in high-temperature or fire environments, leading to a decline in electrical performance.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a kind of flame-retardant cable, including cable core, the inside of the cable core is equipped with three groups of annular distribution wire core, the wire core is composed of conductor, conductor shield layer and inner insulation layer, the outside of the cable core is provided with reinforced insulation layer, the reinforced insulation layer is composed of base insulation layer, nano composite reinforcing layer, the outside of the reinforced insulation layer is provided with high temperature shield layer, the high temperature shield layer is composed of high temperature semiconductive layer, high temperature metal shielding net and high temperature protective layer, the outside of the high temperature shield layer is provided with flame-retardant sheath, the flame-retardant sheath is composed of inner layer flame-retardant base material, flame-retardant reinforcing layer and outer protective layer.

[0007] Preferably, the conductor is twisted by a plurality of oxygen-free copper filaments.

[0008] Preferably, the conductor shield layer is coated on the outside of the conductor, and the inner insulation layer is extrusion-formed on the outside of the conductor shield layer.

[0009] Preferably, the base insulation layer is extrusion-formed on the outside of the cable core, and the nano composite reinforcing layer is fixed on the outside of the base insulation layer by an adhesive.

[0010] Preferably, the high temperature semiconductive layer is extrusion-formed on the outside of the reinforced insulation layer, the high temperature metal shielding net is spirally wound on the outside of the high temperature semiconductive layer, and the high temperature protective layer is fixed on the outside of the high temperature metal shielding net by an adhesive.

[0011] Preferably, the inner layer flame-retardant base material is adhesively fixed on the outside of the high temperature shield layer, the flame-retardant reinforcing layer is fixed on the outside of the inner layer flame-retardant base material by an adhesive, and the outer protective layer is extrusion-formed on the outside of the flame-retardant reinforcing layer.

[0012] Preferably, the voids of the wire core are provided with flame-retardant fillings, and the flame-retardant fillings are flame-retardant glass fibers.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. The high temperature semiconductive layer and the high temperature metal shielding net are used in combination, effectively suppressing the accumulation of electric charges between the cable insulation layer and the shielding layer, reducing the partial discharge and electrical aging caused by the accumulation of electric charges, improving the electrical stability and service life of the cable, the high temperature metal shielding net can effectively shield external electromagnetic interference, protect the signal transmission inside the cable from external influences, improve the anti-interference ability and signal transmission quality of the cable, and the addition of the high temperature metal shielding net and the high temperature protective layer enhances the mechanical strength of the cable, making it more resistant to external environmental impact and extrusion, and improving the durability and reliability of the cable.

[0015] 2、The utility model discloses a combination of fire -retardant inner base material, fire -retardant reinforcing layer and outer protective layer, which significantly improves the fire -retardant performance of the cable, effectively prevents the spread of fire in a fire, and wins valuable time for personnel evacuation and fire rescue. The use of low -smoke halogen -free fire -retardant material makes the cable release little toxic smoke during combustion, reduces the harm to personnel and environment, improves the environmental protection performance of the cable, and improves the wear resistance and weather resistance of the cable through the use of the outer protective layer, so that the cable can resist external environmental erosion and mechanical damage and prolong the service life of the cable.

[0016] 3、The introduction of nanoparticles in the utility model improves the breakdown voltage and dielectric constant of the insulation layer, enhances the electrical insulation performance of the cable, reduces the risk of current leakage and partial discharge, has higher thermal stability and flame retardancy, can maintain the stability of electrical performance in high temperature or fire environment, reduces the risk of cable damage due to overheating, and the filling and dispersion of nanoparticles enhance the mechanical strength of the insulation layer, so that the cable can resist external force impact and extrusion and improve the durability and reliability of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the utility model;

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

[0019] Figure 3 It is a schematic view of the reinforced insulation layer structure of the utility model;

[0020] Figure 4 It is a schematic view of the high temperature shielding layer structure of the utility model;

[0021] Figure 5 It is a schematic view of the fire -retardant sheath structure of the utility model.

[0022] In the drawing: 1, cable core; 2, wire core; 21, conductor; 22, conductor shielding layer; 23, inner insulation layer; 3, reinforced insulation layer; 31, basic insulation layer; 32, nano composite reinforcing layer; 4, high temperature shielding layer; 41, high temperature semi -conductive layer; 42, high temperature metal shielding net; 43, high temperature protective layer; 5, fire -retardant sheath; 51, inner layer fire -retardant base material; 52, fire -retardant reinforcing layer; 53, outer protective layer; 6, fire -retardant filling. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0024] Please refer to Figures 1-5The utility model provides an embodiment: a kind of flame-retardant cable, including cable core 1, the inside of cable core 1 is equipped with three groups of annular distribution's wire core 2, wire core 2 is composed of conductor 21, conductor shield layer 22 and inner insulation layer 23, conductor 21 is twisted by multiple strands of oxygen-free copper fine wire, conductor shield layer 22 is covered in the outside of conductor 21, inner insulation layer 23 is extruded and formed in the outside of conductor shield layer 22, conductor 21 adopts high-purity oxygen-free copper, with excellent electric conductivity and good mechanical properties, to improve the electric efficiency and reduce energy loss, adopt multilayer twisted wire structure, not only improve the flexibility of cable, also can effectively reduce resistance and inductance;Conductor shield layer 22 semiconductive polyolefin, can effectively inhibit electric field concentration, reduce partial discharge, improve the electrical stability of cable;Inner insulation layer 23 is ethylene propylene rubber, not only has excellent insulating property, also has higher heat resistance and mechanical strength, the interstice of wire core 2 is equipped with flame-retardant filling 6, and flame-retardant filling 6 is flame-retardant glass fiber, can keep the stability of cable structure, also can effectively block the horizontal spread of fire force;

[0025] High-purity copper conductor and multilayer twisted wire structure ensure the efficient transmission of current, reduce energy loss, improve the transmission efficiency of cable, the use of conductor shield layer effectively inhibits electric field concentration, reduces partial discharge phenomenon, improves the electrical stability and service life of cable, and the insulating material improves the heat resistance and flame retardance of the cable, so that it can maintain the stability of electrical properties in high temperature or fire environment.

[0026] Please refer to Figure 1 、 Figure 2 And Figure 3 , the outside of cable core 1 is provided with reinforced insulation layer 3, and the reinforced insulation layer 3 is composed of base insulation layer 31 and nano composite reinforcing layer 32, the base insulation layer 31 is extruded and formed on the outside of the cable core 1, and the nano composite reinforcing layer 32 is fixed on the outside of the base insulation layer 31 by an adhesive, the base insulation layer 31 is made of crosslinked polyethylene and tightly wrapped around the outer layer of the cable core 1 to form preliminary electrical isolation and mechanical protection, and the nano composite reinforcing layer 32 is formed by introducing nano silicon dioxide for composite modification on the basis of crosslinked polyethylene to form a nano composite insulating material, and the overall performance of the insulating layer is improved by filling and dispersing nano particles.

[0027] Please refer to Figure 1 、 Figure 2 And Figure 4The outer part of the reinforced insulation layer 3 is provided with a high-temperature shielding layer 4, which is composed of a high-temperature semi-conductive layer 41, a high-temperature metal shielding net 42 and a high-temperature protective layer 43. The high-temperature semi-conductive layer 41 is extrusion-molded on the outer part of the reinforced insulation layer 3. The high-temperature metal shielding net 42 is spirally wound on the outer part of the high-temperature semi-conductive layer 41. The high-temperature protective layer 43 is fixed on the outer part of the high-temperature metal shielding net 42 by an adhesive. The high-temperature semi-conductive layer 41 is made of ethylene-propylene rubber, forming a uniform semi-conductive barrier for inhibiting the accumulation of electric charges between the insulation layer and the shielding layer. The high-temperature metal shielding net 42 is made of a high-temperature and corrosion-resistant tin-plated copper net, which is spirally wound on the outer part of the high-temperature semi-conductive layer, forming a continuous metal shielding layer for further inhibiting electromagnetic interference and electric charge accumulation. The high-temperature protective layer 43 is made of glass fiber reinforced polymer, which is tightly wrapped on the outer part of the high-temperature metal shielding net, forming a protective barrier for preventing direct damage of the internal structure of the cable by the external high-temperature environment.

[0028] Please refer to Figure 1 , Figure 2 and Figure 5 The outer part of the high-temperature shielding layer 4 is provided with a flame-retardant sheath 5, which is composed of an inner flame-retardant base material 51, a flame-retardant reinforcing layer 52 and an outer protective layer 53. The inner flame-retardant base material 51 is adhesively fixed on the outer part of the high-temperature shielding layer 4. The flame-retardant reinforcing layer 52 is fixed on the outer part of the inner flame-retardant base material 51 by an adhesive. The outer protective layer 53 is extrusion-molded on the outer part of the flame-retardant reinforcing layer 52. The inner flame-retardant base material 51 is made of low-smoke and halogen-free flame-retardant polyolefin, which releases very little toxic smoke during combustion and has good flame-retardant performance. The flame-retardant reinforcing layer 52 is made of a flame-retardant reinforcing composite material by adding, for example, aluminum hydroxide and nano-aluminum oxide in the flame-retardant base material, which is uniformly dispersed in the flame-retardant base material to improve the flame-retardant performance of the material by physical and chemical effects. The outer protective layer 53 is made of polyurethane material, which not only has excellent wear resistance but also can improve the flame-retardant performance of the cable to a certain extent, forming a wear-resistant and weather-resistant protective layer to prevent external mechanical damage and erosion of the internal structure of the cable by harsh environments.

[0029] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to which the reference signs belong.

Claims

1. A flame-retardant electrical cable comprising a cable core (1), characterised in that: The inside of the cable core (1) is provided with three groups of annularly distributed wire cores (2), the wire core (2) is composed of a conductor (21), a conductor shielding layer (22) and an inner insulation layer (23), the outside of the cable core (1) is provided with a reinforced insulation layer (3), the reinforced insulation layer (3) is composed of a basic insulation layer (31) and a nano composite reinforcing layer (32), the outside of the reinforced insulation layer (3) is provided with a high temperature shielding layer (4), the high temperature shielding layer (4) is composed of a high temperature semi-conductive layer (41), a high temperature metal shielding net (42) and a high temperature protective layer (43), the outside of the high temperature shielding layer (4) is provided with a flame-retardant sheath (5), the flame-retardant sheath (5) is composed of an inner layer flame-retardant base material (51), a flame-retardant reinforcing layer (52) and an outer protective layer (53).

2. A fire resistant electrical cable according to claim 1, characterised in that: The conductor (21) is twisted by a plurality of oxygen-free copper filaments.

3. A fire resistant electrical cable according to claim 2, wherein: The conductor shielding layer (22) is coated on the outside of the conductor (21), and the inner insulation layer (23) is extrusion formed on the outside of the conductor shielding layer (22).

4. A fire resistant electrical cable according to claim 1, wherein: The basic insulation layer (31) is extrusion formed on the outside of the cable core (1), and the nano composite reinforcing layer (32) is fixed on the outside of the basic insulation layer (31) by an adhesive.

5. A fire resistant electrical cable according to claim 1, wherein: The high temperature semi-conductive layer (41) is extrusion formed on the outside of the reinforced insulation layer (3), the high temperature metal shielding net (42) is spirally wound on the outside of the high temperature semi-conductive layer (41), and the high temperature protective layer (43) is fixed on the outside of the high temperature metal shielding net (42) by an adhesive.

6. A fire resistant electrical cable according to claim 1, wherein: The inner layer flame-retardant base material (51) is adhesively fixed on the outside of the high temperature shielding layer (4), the flame-retardant reinforcing layer (52) is fixed on the outside of the inner layer flame-retardant base material (51) by an adhesive, and the outer protective layer (53) is extrusion formed on the outside of the flame-retardant reinforcing layer (52).

7. A fire resistant electrical cable according to claim 1, wherein: The voids of the wire core (2) are provided with flame-retardant fillings (6), and the flame-retardant fillings (6) are flame-retardant glass fibers.

Images