Single-pair twisted copper foil shielding non-grounding thermocouple cable

Abstract

The utility model discloses a single-pair twisted copper foil shielding non-grounding thermocouple cable, which comprises a cable core formed by twisting a positive wire and a negative wire, an alkali-free glass fiber braid layer, a copper-plastic composite wrapping shielding layer and an FEP polymer sheath are sequentially coated outside the cable core, the positive wire comprises a copper conductor and a first FEP polymer insulating layer, and the negative wire comprises a second FEP polymer insulating layer. The negative wire comprises a copper-nickel conductor and a second FEP polymer insulating layer, 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 PTFE film surface layer, a copper foil and a PTFE film bottom layer, a plurality of gaps with the width of 3-10 microns are formed in the surface of the copper foil at equal intervals in the length direction, and the outer diameter of the FEP polymer sheath is 2.7-4 mm. The thermocouple cable has good mechanical strength and flexibility, the copper foil shielding layer does not need grounding processing, the anti-interference performance is good, and the on-site laying and installation flexibility is better.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a single-pair twisted copper foil shielded non-grounded thermocouple cable. Background Art

[0002] Thermocouple compensation wires and cables are mainly used in various temperature measuring devices and are suitable for temperature control systems in energy, metallurgy, petroleum, chemical and other factories, mines and scientific research departments. Compensation wires can reduce measurement errors and improve the physical and mechanical properties of thermocouple temperature measurement circuits. Thermocouple cables with smaller outer diameters need to take into account mechanical strength and flexibility to facilitate fixed installation and installation, and need to have anti-interference performance in complex electromagnetic environments. Ordinary single-pair twisted thermocouple cables use copper foil shielding and add tinned copper grounding wires for grounding. However, some on-site laying environments are complex, which is not conducive to grounding operations, making laying and installation difficult. Utility Model Content

[0003] The present application aims to solve the technical problem of providing a single-pair twisted copper foil shielded non-grounded thermocouple cable with good mechanical strength and flexibility, and the copper foil shielding layer does not need to be grounded, has good anti-interference performance, and has better flexibility in on-site laying and installation.

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

[0005] A single-pair twisted copper foil shielded non-grounded thermocouple cable comprises a positive conductor and a negative conductor twisted together to form a cable core, the outer portion of the cable core is sequentially coated with an alkali-free glass fiber braided layer, a copper-plastic composite wrapped shielding layer and an FEP polymer sheath, the positive conductor comprises a copper conductor and a first FEP polymer insulating layer, the negative conductor comprises a copper-nickel conductor and a second FEP polymer insulating layer, the copper-plastic composite wrapped shielding layer is a copper-plastic composite tape spirally overlapped wrapped structure, the copper-plastic composite tape is formed by a PTFE film surface layer, copper foil and a PTFE film bottom layer, a plurality of gaps with a width of 3 μm to 10 μm are equidistantly spaced along the length direction on the surface of the copper foil, and the outer diameter of the FEP polymer sheath is 2.7 mm to 4 mm.

[0006] Preferably, the copper conductor and the copper-nickel conductor are both monofilament conductors with a diameter of 0.51 mm or 0.81 mm.

[0007] Preferably, the copper conductor and the copper-nickel conductor are both composed of seven strands of single-wire conductors twisted together, and the diameter of the single-wire conductor is 0.2 mm or 0.32 mm.

[0008] Preferably, the thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20 μm to 100 μm, and the thickness of the copper foil is 10 μm to 50 μm.

[0009] Preferably, the thickness of the first FEP polymer insulation layer and the second FEP polymer insulation layer are both 0.4 mm or 0.5 mm.

[0010] Preferably, the FEP polymer sheath has a thickness of 0.8 mm, 1 mm or 1.2 mm.

[0011] Preferably, the spacing between the gaps is 35 μm to 60 μm, and the angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees.

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

[0013] Preferably, the copper-plastic composite belt has a width of 14 mm to 30 mm.

[0014] Preferably, the outer diameter of the FEP polymer sheath is 2.9 mm, 3.7 mm or 3.8 mm.

[0015] Beneficial effects of this application:

[0016] 1. By adding an alkali-free glass fiber braided layer to cover the positive and negative conductors, the cable core is prevented from loosening, and the mechanical strength and flexibility of the cable are improved. This helps to reduce the torque force of the copper-plastic composite wrapped shielding layer, which is beneficial to improving the flexibility and adaptability of laying and installation in complex environments.

[0017] 2. By improving the original shielding structure of copper foil shielding layer plus grounding wire, removing the grounding wire, and adopting a copper-plastic composite wrapped shielding layer structure, by forming gaps on the copper foil surface that are equally spaced along the length direction and have a width of 3μm to 10μm, 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 between the gaps is 35μm to 60μm, and the overlap rate of the copper-plastic composite tape is 25% to 40%. It has good anti-interference performance, the shielding layer does not need to be grounded, the laying and installation process is simplified, the installation process cost is reduced, and the on-site laying and installation flexibility and adaptability are better.

[0018] 3. By improving the structure of the copper-plastic composite tape and adding PTFE film on both sides of the copper foil, the PTFE film has a small friction coefficient, which helps to improve the flexibility of the shielding layer, relieve stress concentration, prevent the copper foil from cracking and failure, and improve the durability of the cable and the flexibility of 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-positive electrode conductor, 2-negative electrode conductor, 3-alkali-free glass fiber braided layer, 4-copper-plastic composite wrapped shielding layer, 5-FEP polymer sheath, 6-copper conductor, 7-first FEP polymer insulation layer, 8-copper-nickel conductor, 9-second FEP polymer 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 single-pair twisted copper foil shielded non-grounded thermocouple cable of the embodiment of the present application comprises a positive conductor 1 and a negative conductor 2 twisted together to form a cable core. The positive conductor 1 comprises a copper conductor 6 and a first FEP polymer insulation layer 7, and the negative conductor 2 comprises a copper-nickel conductor 8 and a second FEP polymer insulation layer 9. Specifically, the copper conductor 6 and the copper-nickel conductor 8 are both single-filament conductors with a diameter of 0.51 mm or 0.81 mm, or the copper conductor 6 and the copper-nickel conductor 8 are both composed of seven single-wire conductors twisted together and the single-wire conductor has a diameter of 0.2 mm or 0.32 mm. The thickness of the first FEP polymer insulation layer 7 and the second FEP polymer insulation layer 9 are both 0.4 mm or 0.5 mm.

[0024] The cable core is coated with an alkali-free glass fiber braided layer 3, a copper-plastic composite wrapped shielding layer 4 and a FEP polymer sheath 5 in sequence. The copper-plastic composite wrapped shielding layer 4 is a copper-plastic composite tape spirally overlapped wrapped structure. Further, the copper-plastic composite tape overlap rate is 25% to 40%, and the copper-plastic composite tape width is 14mm to 30mm. The copper-plastic composite tape is formed by a PTFE film surface layer, a copper foil and a PTFE film bottom layer. Specifically, the thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20μm to 100μm, and the thickness of the copper foil is 10μm to 50μm. The copper foil surface is equidistantly spaced along the length direction with a width of 3μm to 10μm. Further, the spacing between the gaps is 35μm to 60μm, and the angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees. The outer diameter of the FEP polymer sheath 5 is 2.7 mm to 4 mm, for example, the outer diameter of the FEP polymer sheath 5 is 2.9 mm, 3.7 mm or 3.8 mm. The thickness of the FEP polymer sheath 5 is 0.8 mm, 1 mm or 1.2 mm.

[0025] 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. Single-pair twisted copper foil shielded non-grounded thermocouple cable, characterized by: The invention comprises a positive electrode conductor (1) and a negative electrode conductor (2) twisted together to form a cable core, wherein the outer portion of the cable core is coated with an alkali-free glass fiber braided layer (3), a copper-plastic composite wrapped shielding layer (4) and an FEP polymer sheath (5) in sequence, wherein the positive electrode conductor (1) comprises a copper conductor (6) and a first FEP polymer insulating layer (7), and the negative electrode conductor (2) comprises a copper-nickel conductor (8) and a second FEP polymer insulating layer (9), and the copper-plastic composite wrapped shielding layer (4) is a copper-plastic composite tape spirally overlapped wrapped structure, wherein the copper-plastic composite tape is formed by a PTFE film surface layer, a copper foil and a PTFE film bottom layer, and the surface of the copper foil is provided with a plurality of gaps with a width of 3 μm to 10 μm at equal intervals along the length direction, and the outer diameter of the FEP polymer sheath (5) is 2.7 mm to 4 mm.

2. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The copper conductor (6) and the copper-nickel conductor (8) are both single-filament conductors with a diameter of 0.51 mm or 0.81 mm.

3. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The copper conductor (6) and the copper-nickel conductor (8) are both composed of seven strands of single-wire conductors twisted together, and the diameter of the single-wire conductor is 0.2 mm or 0.32 mm.

4. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The thickness of the PTFE film surface layer and the PTFE film bottom layer are both 20 μm to 100 μm, and the thickness of the copper foil is 10 μm to 50 μm.

5. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The thickness of the first FEP polymer insulation layer (7) and the second FEP polymer insulation layer (9) are both 0.4 mm or 0.5 mm.

6. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The thickness of the FEP polymer sheath (5) is 0.8 mm, 1 mm or 1.2 mm.

7. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The spacing distance between the gaps is 35 μm to 60 μm, and the angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees.

8. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The overlap rate of the copper-plastic composite tape is 25% to 40%.

9. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The copper-plastic composite belt has a width of 14 mm to 30 mm.

10. The single-pair twisted copper foil shielded ungrounded thermocouple cable according to claim 1, characterized in that: The outer diameter of the FEP polymer sheath (5) is 2.9 mm, 3.7 mm or 3.8 mm.

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