Non-grounding type single-conductor heating cable

Abstract

The utility model discloses a non-grounding type single-conductor heating cable. An XLPE insulating layer, a copper-plastic composite wrapping shielding layer, a polyester fiber plain weaving cloth longitudinal wrapping inner cushion layer, a gear-shaped aluminum alloy sheath, an irradiation crosslinking high-density polyethylene inner sheath layer, an AFRP reinforced weaving tensile layer and an irradiation crosslinking high-density polyethylene outer sheath layer are sequentially wrapped outside the copper-nickel alloy single-conduction heating wire. The copper-plastic composite wrapping shielding layer is of a copper-plastic composite belt spiral covering wrapping structure, a copper-plastic composite belt is formed by compounding a polyimide film bottom layer, copper foil and a polyimide film surface layer, and a plurality of gaps with the width ranging from 20 micrometers to 30 micrometers are formed in the surface of the copper foil at equal intervals in the length direction. And an included angle of not more than 120 degrees is formed between the length direction of the gap and the length direction of the copper foil. The cable is better in flexibility and bending resistance, the shielding layer does not need to be grounded, the laying and mounting process difficulty and the mounting operation cost are reduced, and the line maintenance and mounting flexibility is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a non-grounded single-conductor heating cable. Background Art

[0002] Heating cables use alloy resistance wires or carbon fiber heating elements to generate far-infrared heat, which is called carbon fiber floor heating, to achieve the effect of heating or insulation. Usually there are single-conductor and double-conductor cables. Heating cables use electricity as energy and convert electrical energy into thermal energy through the heating conductors inside the cable. They are widely used in floor heating, pipeline heating systems, etc. Ordinary heating cables use copper foil composite shielding and add ground flow lines, which affects the overall flexibility and bending resistance of the cable. Grounding treatment is required during laying, which makes line installation difficult, the installation cost is high, and maintenance and replacement are complicated. Utility Model Content

[0003] The utility model aims at the deficiencies of the prior art and aims to solve the technical problem of providing a non-grounded single-conductor heating cable with better flexibility and bending resistance, no need for grounding of the shielding layer, stable electromagnetic radiation shielding performance, reduced laying and installation process difficulty and installation operation cost, and better line maintenance and installation flexibility.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] The non-grounded single-conductor heating cable comprises a copper-nickel alloy single-conductor heating wire, wherein the copper-nickel alloy single-conductor heating wire is coated with an XLPE insulation layer, a copper-plastic composite wrapped shielding layer, a polyester fiber plain woven cloth longitudinally wrapped inner cushion layer, a gear-shaped aluminum alloy sheath, an irradiated cross-linked high-density polyethylene inner sheath layer, an AFRP reinforced braided tensile layer and an irradiated cross-linked high-density polyethylene outer sheath layer in sequence, wherein the copper-plastic composite wrapped shielding layer is a copper-plastic composite tape spirally overlapped wrapped structure, wherein the copper-plastic composite tape is composed of a polyimide film bottom layer, copper foil and polyimide The film surface is compositely formed, and a number of 20μm to 30μm wide gaps are equidistantly spaced along the length direction of the copper foil. The length direction of the gap has an angle of no more than 120 degrees with the length direction of the copper foil. The polyester fiber plain woven fabric longitudinally wrapped inner cushion layer is a three-layer polyester fiber plain woven fabric sewn longitudinally wrapped structure, and the three longitudinal gaps formed are circumferentially staggered, and the three longitudinal gaps are 120 degrees from each other. The gap distance of the longitudinal gaps does not exceed 50 microns, and the cable length is 15.8m to 163m.

[0006] Preferably, the cable length is 26.3m, 36.8m, 47.3m, 57.9m, 68.4m, 79m, 89.5m, 100m, 110.2m, 121m, 131.6m, 142m and 152.6m.

[0007] Preferably, the copper-nickel alloy single-conductor heating wire is formed by twisting copper-nickel alloy wires.

[0008] Preferably, the angle between the length direction of the slit and the length direction of the copper foil is not less than 30.

[0009] Preferably, the spacing between the gaps is 150 μm to 250 μm.

[0010] Preferably, the overlap rate of the copper-plastic composite tape is 20% to 30%.

[0011] Preferably, the thickness of the polyimide film bottom layer and the polyimide film surface layer are both 30 μm to 150 μm, and the thickness of the copper foil is 20 μm to 80 μm.

[0012] Preferably, the cross-sectional profile of the gear-shaped aluminum alloy sheath is gear-shaped.

[0013] Preferably, the AFRP reinforced braided tensile layer is a braided structure in which inner and outer double layers of aramid strands are spirally wound in opposite directions.

[0014] Preferably, the outer surface of the radiation cross-linked high-density polyethylene inner sheath layer and the inner surface of the radiation cross-linked high-density polyethylene outer sheath layer are both provided with a polyurethane adhesive layer.

[0015] Beneficial effects of the utility model:

[0016] 1. Optimize the original shielding layer structure, remove the ground streamline, add a polyester fiber plain woven fabric inner cushion layer with a longitudinal wrap structure, make the cable core structure more rounded and balanced, increase the mechanical strength, improve flexibility and bending resistance, prevent the shielding layer from direct contact and friction with the gear-shaped aluminum alloy sheath, reduce the lateral pressure on the shielding layer, inhibit the cracking of the copper foil, ensure stable electromagnetic radiation shielding performance, and better durability.

[0017] 2. By removing the ground streamlines, gaps with a width of 20μm to 30μm and equidistantly spaced along the length direction are formed on the surface of the copper foil. The angle between the length direction of the gap and the length direction of the copper foil is 30 to 120 degrees. The optimized spacing between the gaps is 150μm to 250μm. After the copper-plastic composite tape is wrapped, no grounding treatment is required, which can effectively prevent the copper foil surface from being charged and ensure stable shielding performance, which is conducive to reducing the difficulty of the laying and installation process and the cost of installation and maintenance operations, and the line maintenance and installation flexibility is better.

[0018] 3. The gear-shaped aluminum alloy sheath has a gear-shaped cross-sectional structure. Compared with the original circular cross-sectional structure, the surface area is more than doubled, and the heating efficiency is doubled, so that the heat energy of the cable can be quickly dissipated into the air after heating, which is beneficial to reduce energy consumption. It has a longer life and better durability than ordinary heating cables.

[0019] 4. The three layers of polyester fiber plain woven fabric are sewn into a longitudinal wrapping structure and the three longitudinal gaps are arranged circumferentially in an interlaced manner, so that the longitudinal wrapping tension of the inner cushion layer is tight and does not change easily, and will not wrinkle, which is beneficial to improving the bending resistance of the shielding layer and inhibiting the cracking of the copper foil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model.

[0021] In the figure: 1- copper-nickel alloy single-conductor heating wire, 2- XLPE insulation layer, 3- copper-plastic composite wrapped shielding layer, 4- polyester fiber plain woven fabric longitudinally wrapped inner cushion layer, 5- gear-shaped aluminum alloy sheath, 6- irradiation cross-linked high-density polyethylene inner sheath layer, 7- AFRP reinforced braided tensile layer, 8- irradiation cross-linked high-density polyethylene outer sheath layer. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figure 1 As shown, the non-grounded single-conductor heating cable of the embodiment of the utility model comprises a copper-nickel alloy single-conductor heating wire 1. Furthermore, the copper-nickel alloy single-conductor heating wire 1 is formed by twisting copper-nickel alloy wires. The copper-nickel alloy single-conductor heating wire 1 is coated with an XLPE insulation layer 2, a copper-plastic composite wrapped shielding layer 3, a polyester fiber plain woven fabric longitudinally wrapped inner cushion layer 4, a gear-shaped aluminum alloy sheath 5, an irradiation cross-linked high-density polyethylene inner sheath layer 6, an AFRP reinforced braided tensile layer 7 and an irradiation cross-linked high-density polyethylene outer sheath layer 8 in sequence. Furthermore, the outer surface of the irradiation cross-linked high-density polyethylene inner sheath layer 6 and the inner surface of the irradiation cross-linked high-density polyethylene outer sheath layer 8 are both provided with a polyurethane adhesive layer.

[0024] The copper-plastic composite wrapped shielding layer 3 is a copper-plastic composite tape spirally overlapped wrapped structure, and the copper-plastic composite tape overlap rate is 20% to 30%. The copper-plastic composite tape is formed by a polyimide film bottom layer, a copper foil and a polyimide film surface layer. Specifically, the thickness of the polyimide film bottom layer and the polyimide film surface layer are both 30μm to 150μm, and the thickness of the copper foil is 20μm to 80μm. The surface of the copper foil is equidistantly spaced along the length direction with a plurality of 20μm to 30μm wide gaps, and the length direction of the gaps has an angle of no more than 120 degrees with the length direction of the copper foil. Furthermore, the length direction of the gaps has an angle of no less than 30 with the length direction of the copper foil. The spacing between the gaps is 150μm to 250μm. The polyester fiber plain woven fabric longitudinally wrapped inner cushion layer 4 is a three-layer polyester fiber plain woven fabric sewn longitudinally wrapped structure and the three longitudinal gaps formed are arranged circumferentially in an interlaced manner. The three longitudinal gaps are 120 degrees from each other in the circumference, and the gap distance of the longitudinal gaps does not exceed 50 microns. The cross-sectional profile of the gear-shaped aluminum alloy sheath 5 is gear-shaped. In one embodiment, the AFRP reinforced braided tensile layer 7 is a double-layer aramid strand braided structure with reverse spiral winding of the inner and outer layers. The cable length is 15.8m to 163m, for example, the cable length is 26.3m, 36.8m, 47.3m, 57.9m, 68.4m, 79m, 89.5m, 100m, 110.2m, 121m, 131.6m, 142m and 152.6m.

[0025] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. Non-grounded single-conductor heating cable, characterized by: The invention comprises a copper-nickel alloy single-conductor heating wire (1), wherein the copper-nickel alloy single-conductor heating wire (1) is coated with an XLPE insulation layer (2), a copper-plastic composite wrapped shielding layer (3), a polyester fiber plain woven fabric longitudinally wrapped inner cushion layer (4), a gear-shaped aluminum alloy sheath (5), an irradiated cross-linked high-density polyethylene inner sheath layer (6), an AFRP reinforced braided tensile layer (7) and an irradiated cross-linked high-density polyethylene outer sheath layer (8) in sequence, wherein the copper-plastic composite wrapped shielding layer (3) is a copper-plastic composite tape spirally overlapped wrapped structure, wherein the copper-plastic composite tape is composed of a polyimide film bottom layer. , copper foil and a polyimide film surface layer are compositely formed, the copper foil surface is provided with a plurality of slits with a width of 20 μm to 30 μm at equal intervals along the length direction, the length direction of the slits and the length direction of the copper foil have an angle of no more than 120 degrees, the polyester fiber plain woven fabric longitudinally wrapped inner cushion layer (4) is a three-layer polyester fiber plain woven fabric longitudinally wrapped structure and the three longitudinal slits formed are arranged in a circumferentially staggered manner, the three longitudinal slits are 120 degrees to each other in the circumferential direction, the gap distance of the longitudinal slits does not exceed 50 microns, and the cable length is 15.8m to 163m.

2. The non-grounded single-conductor heating cable according to claim 1 is characterized in that: The cable lengths are 26.3m, 36.8m, 47.3m, 57.9m, 68.4m, 79m, 89.5m, 100m, 110.2m, 121m, 131.6m, 142m and 152.6m.

3. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The copper-nickel alloy single-conductor heating wire (1) is formed by twisting copper-nickel alloy wires.

4. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The angle between the length direction of the slit and the length direction of the copper foil is not less than 30.

5. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The spacing between the gaps is 150 μm to 250 μm.

6. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The overlap rate of copper-plastic composite tape is 20% to 30%.

7. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The thickness of the polyimide film bottom layer and the polyimide film surface layer are both 30 μm to 150 μm, and the thickness of the copper foil is 20 μm to 80 μm.

8. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The cross-sectional profile of the gear-shaped aluminum alloy sheath (5) is gear-shaped.

9. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The AFRP reinforced braided tensile layer (7) is a braided structure in which inner and outer double layers of aramid strands are mutually reversely spirally wound.

10. The non-grounded single-conductor heating cable according to claim 1, characterized in that: The outer surface of the radiation cross-linked high-density polyethylene inner sheath layer (6) and the inner surface of the radiation cross-linked high-density polyethylene outer sheath layer (8) are both provided with a polyurethane adhesive layer.

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