Variable frequency cable with high flame retardant property

Abstract

The utility model relates to the field of wires and cables, in particular to a high-flame-retardant variable frequency cable, which comprises a plurality of conductors and a plurality of insulating layers, the insulating layers are arranged on the outer sides of the conductors, a copper wire braided split-phase shielding layer is arranged on the outer side of each insulating layer, and a silicon rubber filling layer is arranged on the outer side of each copper wire braided split-phase shielding layer. A flame-retardant belting layer is arranged outside the silicone rubber filling layer, a corrugated copper sheath is arranged outside the flame-retardant belting layer, and an outer sheath layer is arranged outside the corrugated copper sheath. Through the insulating layer, the silicone rubber filling layer, the flame-retardant belting layer, the corrugated copper sheath and the outer sheath layer, the flame-retardant, moisture-proof and anti-interference performances of the cable are effectively improved, and the structure is suitable for the application of the variable frequency cable in a complex scene.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric wire and cable, especially to a high flame-retardant variable frequency cable. BACKGROUND

[0002] Variable frequency cable is mainly used for the cable directly connected with variable frequency power supply and variable frequency motor, and is used for transmitting electric energy in power transmission and distribution line with rated voltage 1000 volts and below, especially suitable for radio communication, papermaking, metallurgy, metal processing, mine, railway and food processing industries. For special fields such as railway and radio communication, variable frequency cable is required to have high anti-interference performance and high flame-retardant performance, and ordinary variable frequency cable cannot meet the requirement. Therefore, a high flame-retardant variable frequency cable is proposed to solve the above problems. SUMMARY

[0003] The utility model discloses a kind of high flame-retardant variable frequency cables, by using low-smoke halogen-free flame-retardant polyolefin insulation layer, copper wire braiding phase shielding layer, silicone rubber filling layer, flame-retardant tape layer, corrugated copper sheath, low-smoke halogen-free flame-retardant polyolefin sheath structure. Improve cable flame-retardant performance, shielding performance.

[0004] To achieve the above object, the utility model provides a kind of high flame-retardant variable frequency cables, including multiple conductors, further including multiple insulation layers, multiple the insulation layer is arranged on the outer side of multiple the conductor, copper wire braiding phase shielding layer is arranged on the outer side of the insulation layer, silicone rubber filling layer is arranged on the outer side of the copper wire braiding phase shielding layer, flame-retardant tape layer is arranged on the outer side of the silicone rubber filling layer, corrugated copper sheath is arranged on the outer side of the flame-retardant tape layer, outer sheath layer is arranged on the outer side of the corrugated copper sheath.

[0005] Among them, the conductor is layered stranded by multiple annealed metal wires.

[0006] Among them, the insulation layer is extruded and wrapped by low-smoke halogen-free flame-retardant polyolefin insulation material outside the conductor.

[0007] Among them, the copper wire braiding phase shielding layer is woven by copper wire, and weaving density ρ satisfies 80%mm≤ρ.

[0008] Among them, the silicone rubber filling layer is extruded and wrapped by silicone rubber material.

[0009] Among them, the flame-retardant tape layer is composed of glass fiber tape and inorganic mineral fire-resistant tape from inside to outside.

[0010] Among them, the thickness h2 of the silicone rubber filling layer satisfies 1mm≤h2≤2mm, and is evenly filled between the insulation layer and the flame-retardant tape layer.

[0011] The number of layers T1 of the glass fiber tape satisfies 1 layer <= T1, and the number of layers T2 of the inorganic mineral fire-resistant tape satisfies 2 layers <= T2.

[0012] The corrugated copper sheath is a corrugated copper sheath adopting inert gas protection welding, and the thickness h3 of the corrugated copper sheath satisfies 0.2mm <= h3.

[0013] The outer sheath layer is extruded by low-smoke halogen-free flame-retardant polyolefin material, and the thickness h3 satisfies 1.4mm <= h3.

[0014] Compared with the prior art, the high-flame-retardant variable-frequency cable has the following advantages:

[0015] The high-flame-retardant variable-frequency cable comprises, from inside to outside, a conductor, an insulation layer, a copper wire braiding phase-separating shielding layer, a silicone rubber filling layer, a flame-retardant tape layer, a corrugated copper sheath and an outer sheath layer.

[0016] The insulation layer is made of insulation-grade low-smoke halogen-free flame-retardant polyolefin material, which ensures the electrical performance of the insulation and improves the intrinsic flame-retardant performance of the insulation material; the copper wire braiding phase-separating shielding layer is arranged outside the insulation layer to improve the anti-interference performance of the cable; the silicone rubber filling layer and the flame-retardant tape layer are arranged outside the copper wire braiding phase-separating shielding layer, the silicone rubber filling layer is extruded by silicone rubber, and the flame-retardant tape layer is wound by a glass fiber tape and an inorganic mineral fire-resistant tape from inside to outside; the structure adopts intrinsic flame-retardant materials, improves the flame-retardant grade of the cable core and improves the overall flame-retardant grade of the cable to a high level, thereby solving the problem that the cable core is not flame-retardant or even flammable after the sheath of the flame-retardant variable-frequency cable fails in the market; secondly, the good mechanical performance of the silicone rubber improves the overall flexibility of the cable, which is beneficial to the actual laying of the cable; the corrugated copper sheath is arranged outside the flame-retardant tape, which can effectively prevent the flame from spreading to the cable core and improve the flame-retardant and fire-resistant performance of the cable, and the structure enhances the moisture-proof and anti-interference performance of the cable and the overall operation capability of the cable under complex use conditions; the low-smoke halogen-free flame-retardant polyolefin outer sheath is arranged outside the corrugated copper sheath to improve the flame-retardant performance of the cable and protect the corrugated copper sheath and the cable core. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced.

[0018] Figure 1 is a sectional view of the high-flame-retardant variable-frequency cable of the utility model.

[0019] Figure 2 is a structural schematic view of the glass fiber tape and the inorganic mineral fire-resistant tape.

[0020] In the figure: 1 - conductor, 2 - insulation layer, 3 - copper wire braided phase separation shielding layer, 4 - silicone rubber filling layer, 5 - flame-retardant wrapping layer, 6 - corrugated copper sheath, 7 - outer sheath layer, 8 - glass fiber wrapping, 9 - inorganic mineral fire-resistant wrapping. DETAILED DESCRIPTION

[0021] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, the embodiments described below are exemplary, and are intended to explain the utility model, and cannot be understood as the limitation of the utility model.

[0022] Please refer to Figure 1 And Figure 2 Wherein Figure 1 It is the cross section view of high flame-retardant performance frequency conversion cable, Figure 2 It is the structural schematic view of glass fiber wrapping and inorganic mineral fire-resistant wrapping.

[0023] The utility model provides a kind of high flame-retardant performance frequency conversion cable, including conductor 1, insulation layer 2, copper wire braided phase separation shielding layer 3, silicone rubber filling layer 4, flame-retardant wrapping layer 5, corrugated copper sheath 6, outer sheath layer 7, effectively improve cable flame-retardant, moisture-proof, anti-interference etc. performance by the aforementioned structure, the structure is applicable to the application of frequency conversion cable under complex scene.

[0024] The utility model embodiment provides a kind of high flame-retardant frequency conversion cable, the high flame-retardant frequency conversion cable includes conductor 1, insulation layer 2, copper wire braided phase separation shielding layer 3, silicone rubber filling layer 4, flame-retardant wrapping layer 5, corrugated copper sheath 6 and outer sheath layer 7 in order from inside to outside.

[0025] Wherein, the conductor 1 is layered stranded by multiple annealed metal wires.

[0026] As preferably, the insulation layer 2 is extruded and wrapped by low-smoke halogen-free flame-retardant polyolefin insulation material outside the conductor 1.

[0027] Further, the copper wire braided phase separation shielding layer 3 is woven by copper wire, and weaving density ρ satisfies 80%mm≤ρ.

[0028] As preferably, the thickness h1 of the silicone rubber filling layer 4 satisfies 1mm≤h1≤2mm, and should be uniformly filled with cable core outer layer and its insulation stranded gap, can enhance the flame-retardant fire resistance of cable core, and strengthen the flexibility of cable core.

[0029] As preferably, the flame-retardant wrapping layer 5 is wrapped around the glass fiber wrapping 8 and the inorganic mineral fire-resistant wrapping 9 from inside to outside, wherein the glass fiber wrapping 8 plays a role of covering the silicone rubber and tightening the cable core, and meanwhile, the silicone rubber is not easy to deform in the vulcanization process of the silicone rubber; the inorganic mineral fire-resistant wrapping 9 is a intrinsic flame-retardant fire-resistant material, so that the flame is not easy to spread to the cable core, and the flame-retardant fire-resistant performance of the cable core is enhanced; the layer number T1 of the glass fiber wrapping 8 satisfies 1 layer≤T1, and the layer number T2 of the inorganic mineral fire-resistant wrapping 9 satisfies 2 layers≤T2.

[0030] As preferably, the corrugated copper sheath 6 is a corrugated copper sheath adopting inert gas protection welding, and the thickness h3 of the corrugated copper sheath 6 satisfies 0.2mm≤h3, so that the flame is effectively isolated from spreading to the cable core, and the flame-retardant fire-resistant performance of the cable is improved; and the structure enhances the moisture-proof and anti-interference performance of the cable, and enhances the overall operation capability of the cable under complex use conditions.

[0031] Further, the outer sheath layer 7 adopts low-smoke halogen-free flame-retardant polyolefin sheath material, which is suitable for the current low-smoke halogen-free flame-retardant performance requirements in many occasions.

[0032] Compared with the prior art, the variable frequency cable provided by the utility model, the insulation layer 2 adopts low-smoke halogen-free flame-retardant polyolefin insulation layer, which increases the intrinsic flame-retardant performance of the insulation under the premise of ensuring the electrical performance of the cable; the silicone rubber filling layer 4 is added to the cable core, so that the intrinsic flame-retardant performance of the cable core is improved, and meanwhile, the flexibility of the cable is improved due to the good mechanical performance of the silicone rubber material, so that the cable is more suitable for complex laying environments; the flame-retardant wrapping layer 5, wherein the glass fiber wrapping 8, makes the silicone rubber extrusion and vulcanization process performance better, and secondly, the cable core is better tightened and fixed, so as to ensure the excellent structure of the cable; the inorganic mineral fire-resistant wrapping 9 is an intrinsic fire-resistant flame-retardant material, which plays a role of isolating the flame from spreading to the cable core and enhancing the flame-retardant fire-resistant performance of the cable; the corrugated copper sheath 6 can effectively isolate the flame from spreading to the cable core, and improve the flame-retardant fire-resistant performance of the cable; and the structure enhances the moisture-proof and anti-interference performance of the cable, and enhances the overall operation capability of the cable under complex use conditions; the outer sheath layer 7 adopts low-smoke halogen-free flame-retardant polyolefin sheath material, which is suitable for the current low-smoke halogen-free flame-retardant performance requirements in many occasions.

[0033] The above disclosure is only one or more preferred embodiments of the present application, and cannot limit the scope of the present application. Those skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A high flame-retardant performance variable frequency cable, comprising a plurality of conductors, characterized in that, a plurality of insulation layers are arranged outside the plurality of conductors, a copper wire braided phase separation shielding layer is arranged outside the insulation layer, a silicone rubber filling layer is arranged outside the copper wire braided phase separation shielding layer, a flame-retardant wrapping layer is arranged outside the silicone rubber filling layer, a corrugated copper sheath is arranged outside the flame-retardant wrapping layer, and an outer sheath layer is arranged outside the corrugated copper sheath.

2. The high flame-retardant performance variable frequency cable according to claim 1, characterized in that, the insulation layer is extruded by low-smoke halogen-free flame-retardant polyolefin insulation material.

3. The high flame-retardant performance variable frequency cable according to claim 1, characterized in that, the silicone rubber filling layer is extruded by silicone rubber material.

4. The high flame-retardant performance variable frequency cable according to claim 1, characterized in that, the flame-retardant wrapping layer is composed of glass fiber wrapping and inorganic mineral fireproof wrapping from inside to outside.

5. The high flame-retardant performance variable frequency cable according to claim 3, characterized in that, the thickness h2 of the silicone rubber filling layer satisfies 1mm≤h2≤2mm, and is uniformly filled between the insulation layer and the flame-retardant wrapping layer.

6. The high flame-retardant performance variable frequency cable according to claim 4, characterized in that, the number of layers T1 of the glass fiber wrapping satisfies 1 layer≤T1, and the number of layers T2 of the inorganic mineral fireproof wrapping satisfies 2 layers≤T2.

7. The high flame-retardant performance variable frequency cable according to claim 1, characterized in that, the thickness h3 of the corrugated copper sheath satisfies 0.2mm≤h3.

8. The high flame-retardant performance variable frequency cable according to claim 1, characterized in that, the outer sheath layer is extruded by low-smoke halogen-free flame-retardant polyolefin material, and the thickness h3 satisfies 1.4mm≤h3.

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