Anti-corrosion non-grounding multi-pair shielding thermocouple cable

Abstract

The utility model discloses an anti-corrosion non-grounding multi-pair sub-shielding thermocouple cable which comprises a plurality of thermocouple compensation wires which jointly form a cable core, the thermocouple compensation wires comprise positive wires and negative wires which form a wire core body, and a copper-plastic composite wrapping sub-shielding layer is wrapped outside the wire core body. A polyvinyl chloride inner cushion layer, a copper-plastic composite wrapping total shielding layer and a polyvinyl chloride outer sheath layer are sequentially wrapped outside the cable core, the branch shielding layer and the total shielding layer are both of a copper-plastic composite belt spiral covering wrapping structure, a copper-plastic composite belt is formed by compounding a PTFE film surface layer, a copper foil and a PTFE film bottom layer, the outer surface of the copper foil is electroplated to form a copper-zinc alloy electroplated layer, and the outer surface of the copper foil is coated with a copper-zinc alloy electroplated layer. A plurality of gaps are obliquely formed in the surface of the copper foil at equal intervals in the length direction, and the outer diameter of the polyvinyl chloride outer sheath layer is 11-35 mm. The thermocouple cable effectively inhibits the crosstalk phenomenon between the compensation wires, the shielding layer does not need to be grounded, the corrosion resistance is better, and the laying and installation adaptability in a complex environment is better.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to an anti-corrosion non-grounded multi-pair shielded thermocouple cable. Background Art

[0002] Thermocouple compensation cables are suitable for thermocouple circuits, such as those used in petrochemical plants, public facilities and industrial plants. Compensation wires can reduce measurement errors and improve the physical and mechanical properties of thermocouple temperature measurement circuits. Thermocouple compensation cables with multiple pairs of positive and negative conductors need to take into account mechanical strength, flexibility, shielding characteristics, corrosion resistance and other properties to facilitate laying and installation. Due to the complex electromagnetic environment at the application site, it is very unfavorable for ordinary thermocouple compensation cables to shield external interference, and the crosstalk between compensation wires seriously affects the measurement error of the compensation wires. Ordinary thermocouple compensation cables should be shielded with copper foil and grounded with tinned copper grounding wires. However, the complexity of the on-site laying environment is not conducive to grounding operations, which brings difficulties to laying and installation. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a corrosion-resistant non-grounded multi-pair shielded thermocouple cable, which can effectively suppress the crosstalk between the compensation wires, has better resistance to external electromagnetic interference, does not require grounding treatment for the shielding layer and has better corrosion resistance, and has better adaptability to laying and installation in complex field environments.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The anti-corrosion non-grounded multi-pair shielded thermocouple cable comprises a plurality of thermocouple compensation wires which together constitute a cable core. The thermocouple compensation wires comprise a positive wire and a negative wire which constitute a wire core body. The outside of the wire core body is coated with a copper-plastic composite wrapped shielding layer. The outside of the cable core is coated with a polyvinyl chloride inner cushion layer, a copper-plastic composite wrapped shielding layer and a polyvinyl chloride outer sheath layer in sequence. The copper-plastic composite wrapped shielding layer and the copper-plastic composite wrapped shielding layer are both copper-plastic composite tape spirally overlapped wrapped structures. The copper-plastic composite tape is formed by a PTFE film surface layer, a copper foil and a PTFE film bottom layer. The outer surface of the copper foil is electroplated to form a copper-zinc alloy electroplating layer. The surface of the copper foil is provided with a plurality of slits equidistantly spaced and obliquely arranged along the length direction. The outer diameter of the polyvinyl chloride outer sheath layer is 11 mm to 35 mm.

[0006] Preferably, the positive electrode wire comprises a copper conductor and a first XLPE insulation layer, the thickness of the first XLPE insulation layer is 0.4 mm or 0.5 mm, and the negative electrode wire comprises a copper-nickel conductor and a second XLPE insulation layer, the thickness of the second XLPE insulation layer is 0.4 mm or 0.5 mm.

[0007] Preferably, the thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20 μm to 150 μm, the thickness of the copper foil is 10 μm to 80 μm, and the thickness of the copper-zinc alloy electroplating layer is 1 μm to 3 μm.

[0008] Preferably, the gap width is 3 μm to 50 μm.

[0009] Preferably, the spacing between the gaps is 30 μm to 450 μm.

[0010] Preferably, the angle between the length direction of the slit and the length direction of the copper foil is 30 degrees to 150 degrees.

[0011] Preferably, the number of the thermocouple compensation wires is 4 to 24.

[0012] Preferably, the overlap rate of the copper-plastic composite tape is 25% to 40%.

[0013] Preferably, the thickness of the polyvinyl chloride inner cushion layer is 0.45 mm to 0.8 mm.

[0014] Preferably, the thickness of the polyvinyl chloride outer sheath layer is 1 mm to 1.6 mm.

[0015] Beneficial effects of this application:

[0016] 1. Wrap multiple thermocouple compensation wires with a polyvinyl chloride inner cushion layer to prevent the cable core from loosening. The copper-plastic composite wrapped total shielding layer is located between the polyvinyl chloride inner cushion layer and the polyvinyl chloride outer sheath layer, which alleviates the stress concentration of the total shielding layer, helps to improve the flexibility and bending resistance of the cable, and is beneficial to improve the adaptability of laying and installation in complex field environments.

[0017] 2. The thermocouple compensation wires are shielded from each other by copper-plastic composite wrapped shielding layers. The copper-plastic composite tape uses PTFE film with a small friction coefficient, which suppresses the contact friction between the thermocouple compensation wires, reduces core and wire breakage, and effectively suppresses the crosstalk between the compensation wires. The structure of the sub- and overall shielding layers is optimized, and a copper-zinc alloy electroplating layer is formed on the outer surface of the original copper foil, which helps to improve corrosion resistance, inhibit oxidation of the copper foil, eliminate discoloration and other degradation caused by oxidation, and has better resistance to external electromagnetic interference, ensuring stable and reliable shielding performance and durable application.

[0018] 3. Improve the shielding structure of copper foil shielding layer plus grounding wire, remove the grounding wire, and adopt copper-plastic composite wrapped shielding layer structure for both sub-shielding layer and overall shielding layer. By forming gaps with equal spacing along the length direction and a width of 3μm to 50μm 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 optimized to be 30 degrees to 150 degrees, the spacing distance between the gaps is 30μm to 450μm, and the overlap rate of the copper-plastic composite tape is 25% to 40%, which has good anti-interference performance. Both sub-shielding layer and overall shielding layer do not need to be grounded, which simplifies the laying and installation process, reduces the installation process cost, and has better flexibility and adaptability for on-site laying and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-thermocouple compensation wire, 2-positive electrode wire, 3-negative electrode wire, 4-copper-plastic composite wrapping sub-shielding layer, 5-polyvinyl chloride inner cushion layer, 6-copper-plastic composite wrapping overall shielding layer, 7-polyvinyl chloride outer sheath layer, 8-copper conductor, 9-first XLPE insulation layer, 10-copper-nickel conductor, 11-second XLPE insulation layer. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1 The anti-corrosion non-grounded multi-pair shielded thermocouple cable of the embodiment of the present application includes 4 to 24 thermocouple compensation wires 1 that together constitute a cable core, and 12 in the illustrated embodiment. The thermocouple compensation wire 1 includes a positive wire 2 and a negative wire 3 to form a wire core, and the outside of the wire core is coated with a copper-plastic composite wrapped shielding layer 4. In one embodiment, the positive wire 2 includes a copper conductor 8 and a first XLPE insulation layer 9, and the thickness of the first XLPE insulation layer 9 is 0.4 mm or 0.5 mm, and the negative wire 3 includes a copper-nickel conductor 10 and a second XLPE insulation layer 11, and the thickness of the second XLPE insulation layer 11 is 0.4 mm or 0.5 mm.

[0024] The cable core is coated with a polyvinyl chloride inner cushion layer 5, a copper-plastic composite wrapping total shielding layer 6 and a polyvinyl chloride outer sheath layer 7 in sequence, and the outer diameter of the polyvinyl chloride outer sheath layer 7 is 11 mm to 35 mm. The thickness of the polyvinyl chloride inner cushion layer 5 is 0.45 mm to 0.8 mm, and the thickness of the polyvinyl chloride outer sheath layer 7 is 1 mm to 1.6 mm.

[0025] The copper-plastic composite wrapped shielding layer 4 and the copper-plastic composite wrapped total shielding layer 6 are both copper-plastic composite tape spirally overlapped wrapped structures, and further, the copper-plastic composite tape overlap rate is 25% to 40%. The copper-plastic composite tape is formed by a PTFE film surface layer, a copper foil and a PTFE film bottom layer, and the outer surface of the copper foil is electroplated to form a copper-zinc alloy electroplating layer. Specifically, the thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20μm to 150μm, the thickness of the copper foil is 10μm to 80μm, and the copper-zinc alloy electroplating layer is 1μm to 3μm. The surface of the copper foil is equidistantly spaced and obliquely arranged along the length direction, the width of the gap is 3μm to 50μm, and the spacing between the gaps is 30μm to 450μm. The angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Anti-corrosion non-grounded multi-pair shielded thermocouple cable, characterized by: The invention comprises a plurality of thermocouple compensation wires (1) which together form a cable core. The thermocouple compensation wires (1) comprise a positive electrode wire (2) and a negative electrode wire (3) which form a wire core body. The wire core body is coated with a copper-plastic composite wrapped shielding layer (4) on the outside. The cable core is coated with a polyvinyl chloride inner cushion layer (5), a copper-plastic composite wrapped shielding layer (6) and a polyvinyl chloride outer sheath layer (7) on the outside in sequence. The copper-plastic composite wrapped shielding layer (4) and the copper-plastic composite wrapped shielding layer (6) are both copper-plastic composite tape spirally overlapped wrapped structures. The copper-plastic composite tape is formed by a composite of a PTFE film surface layer, a copper foil and a PTFE film bottom layer. The outer surface of the copper foil is electroplated to form a copper-zinc alloy electroplating layer. The surface of the copper foil is provided with a plurality of slits which are equidistantly spaced and obliquely arranged along the length direction. The outer diameter of the polyvinyl chloride outer sheath layer (7) is 11 mm to 35 mm.

2. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The positive electrode wire (2) comprises a copper conductor (8) and a first XLPE insulation layer (9), the thickness of the first XLPE insulation layer (9) is 0.4 mm or 0.5 mm, and the negative electrode wire (3) comprises a copper-nickel conductor (10) and a second XLPE insulation layer (11), the thickness of the second XLPE insulation layer (11) is 0.4 mm or 0.5 mm.

3. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20 μm to 150 μm, the thickness of the copper foil is 10 μm to 80 μm, and the thickness of the copper-zinc alloy electroplating layer is 1 μm to 3 μm.

4. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The width of the gap is 3 μm to 50 μm.

5. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The spacing between the gaps is 30 μm to 450 μm.

6. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The angle between the length direction of the slit and the length direction of the copper foil is 30 degrees to 150 degrees.

7. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The number of the thermocouple compensation wires (1) is 4 to 24.

8. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1 is characterized in that: The overlap rate of the copper-plastic composite tape is 25% to 40%.

9. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1, characterized in that: The thickness of the polyvinyl chloride inner cushion layer (5) is 0.45 mm to 0.8 mm.

10. The anti-corrosion non-grounded multi-pair shielded thermocouple cable according to claim 1, characterized in that: The thickness of the polyvinyl chloride outer sheath layer (7) is 1 mm to 1.6 mm.

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