Single-pair twisted anti-electromagnetic interference type thermocouple cable

Abstract

The utility model discloses a single-pair twisted anti-electromagnetic interference type thermocouple cable, which comprises a cable core formed by twisting a positive wire and a negative wire, and an alkali-free glass fiber braid layer, a tinned copper wire winding total shielding layer, a superconductive carbon fiber coating layer and a PFA polymer sheath are sequentially coated outside the cable core, the positive wire comprises a copper conductor, a first PFA polymer insulating layer and a first semi-conductive nylon wrapping sub-shielding layer, the negative wire comprises a copper nickel conductor, a second PFA polymer insulating layer and a second semi-conductive nylon wrapping sub-shielding layer, and the outer diameter of the PFA polymer sheath is 2.6-3.8 mm. The thermocouple cable gives consideration to the mechanical strength and flexibility of the shielding layers, increases the branch shielding layers, optimizes the structure of the total shielding layer, improves the anti-electromagnetic interference performance through the combination of the branch shielding layers and the total shielding layer, and is stable in shielding performance and durable in application.

Description

Technical Field

[0001] This application belongs to the technical field of cables, and in particular, relates to a single-pair twisted electromagnetic interference-resistant thermocouple cable. Background Art

[0002] Thermocouple compensating leads and compensating cables are mainly applied to various temperature measuring devices and are suitable for temperature control systems in factories and mines such as energy, metallurgy, petroleum, and chemical industries, as well as scientific research departments. Compensating leads can reduce measurement errors and improve the physical and mechanical properties of thermocouple temperature measuring circuits. Thermocouple cables with a smaller outer diameter need to consider both mechanical strength and flexibility to facilitate fixed laying and installation, and need to have anti-interference performance in complex electromagnetic environments. Ordinary single-pair twisted thermocouple cables mostly adopt a round copper wire braided shielding structure, but the gaps formed between round copper wires are relatively large, resulting in a large attenuation of transmitted signals and weak anti-interference performance, and the noise shielding effect is not very ideal. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide a single-pair twisted electromagnetic interference-resistant thermocouple cable, which takes into account the mechanical strength and flexibility of the shielding layer, adds a sub-shielding layer and optimizes the structure of the total shielding layer. The combination of the sub-shielding layer and the total shielding layer is beneficial to improving the anti-electromagnetic interference performance, with stable shielding performance and durable application.

[0004] The above technical problem is solved by the following technical solutions in this application.

[0005] A single-pair twisted electromagnetic interference-resistant thermocouple cable includes a core formed by twisting a positive wire and a negative wire. An alkali-free glass fiber braided layer, a tinned copper wire wound total shielding layer, a superconducting carbon fiber coating layer, and a PFA polymer sheath are sequentially coated outside the core. The positive wire includes a copper conductor, a first PFA polymer insulating layer, and a first semi-conductive nylon wrapped sub-shielding layer. The negative wire includes a copper-nickel conductor, a second PFA polymer insulating layer, and a second semi-conductive nylon wrapped sub-shielding layer. The tinned copper wire wound total shielding layer is composed of an inner layer fan-shaped tinned copper wire winding layer and an outer layer fan-shaped tinned copper wire winding layer. A plurality of inner layer fan-shaped tinned copper wires are spirally wound side by side outside the alkali-free glass fiber braided layer to form the inner layer fan-shaped tinned copper wire winding layer. A plurality of outer layer fan-shaped tinned copper wires are spirally wound side by side outside the inner layer fan-shaped tinned copper wire winding layer to form the outer layer fan-shaped tinned copper wire winding layer. The inner circumferential butt joints in contact between adjacent inner layer fan-shaped tinned copper wires and the outer circumferential butt joints in contact between adjacent outer layer fan-shaped tinned copper wires are arranged in a circumferential staggered manner. The outer diameter of the PFA polymer sheath is 2.6 mm to 3.8 mm.

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

[0007] Preferably, the thicknesses of both the first PFA polymer insulating layer and the second PFA polymer insulating layer are 0.3 mm, 0.4 mm or 0.5 mm.

[0008] Preferably, both the first semi-conductive nylon wrapped partial shielding layer and the second semi-conductive nylon wrapped partial shielding layer are multi-layer overlapping wrapped structures of semi-conductive nylon tapes with an overlapping rate of 20% to 30%.

[0009] Preferably, the thicknesses of both the first semi-conductive nylon wrapped partial shielding layer and the second semi-conductive nylon wrapped partial shielding layer are 0.05 mm to 0.1 mm.

[0010] Preferably, the thickness of the PFA polymer sheath is 0.8 mm to 1 mm.

[0011] Preferably, the thickness of the inner layer sector-shaped tinned copper wire winding layer is less than that of the outer layer sector-shaped tinned copper wire winding layer.

[0012] Preferably, the cross-sectional area of the inner layer sector-shaped tinned copper wire is less than that of the outer layer sector-shaped tinned copper wire.

[0013] Preferably, the shielding coverage rate of the tinned copper wire wound total shielding layer is not less than 95%.

[0014] Advantages of the present application:

[0015] 1. A semi-conductive nylon is wrapped outside the insulating layers of the positive and negative wires to form a partial shielding layer, enabling the positive and negative wires to have high-temperature resistance and electromagnetic interference resistance capabilities, which helps reduce the signal attenuation amount. At the same time, the cable forms a shielding structure combining partial shielding and total shielding, with better external electromagnetic interference resistance, ensuring stable and reliable shielding performance and durable application.

[0016] 2. By optimizing the total shielding layer structure, the original round tinned copper wire is improved to a sector-shaped tinned copper wire co-directional double-layer winding shielding structure, which has better flexibility and improves the mechanical strength of the total shielding layer. The double-layer sector-shaped tinned copper wire winding helps slow down stress concentration, reduce the torque force during bending, improve flexibility and anti-bending performance. The inner circumferential butt joints between adjacent inner layer sector-shaped tinned copper wires and the outer circumferential butt joints between adjacent outer layer sector-shaped tinned copper wires are arranged in a circumferential staggered manner, avoiding the problem of weak electromagnetic interference resistance caused by the large gaps formed between round copper wires, helping to reduce the signal attenuation amount, enhance the electromagnetic interference resistance performance, improve the stability of the shielding performance, and have better durable application performance.

[0017] 3. Adding an alkali-free glass fiber braided layer helps prevent the cable core from loosening, taking into account improving the mechanical strength and flexibility of the cable, helps slow down the torque force and stress concentration of the semi-conductive nylon wrapped partial shielding layer, inhibits the loosening of the semi-conductive nylon tape wrapping and the exposure of gaps in the overlapping part, and helps improve the stability of the shielding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present application.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS:

[0020] 1 - Positive electrode wire, 2 - Negative electrode wire, 3 - Alkali-free glass fiber braided layer, 4 - Tinned copper wire wound total shielding layer, 5 - Superconducting carbon fiber coating layer, 6 - PFA polymer sheath, 7 - Copper conductor, 8 - First PFA polymer insulation layer, 9 - First semi-conductive nylon wrapped partial shielding layer, 10 - Copper-nickel conductor, 11 - Second PFA polymer insulation layer, 12 - Second semi-conductive nylon wrapped partial shielding layer. SPECIFIC EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0022] See Figure 1 , the single-pair twisted electromagnetic interference-resistant thermocouple cable of the embodiment of the present application includes a cable core formed by twisting a positive electrode wire 1 and a negative electrode wire 2. The positive electrode wire 1 includes a copper conductor 7, a first PFA polymer insulation layer 8 and a first semi-conductive nylon wrapped partial shielding layer 9. The negative electrode wire 2 includes a copper-nickel conductor 10, a second PFA polymer insulation layer 11 and a second semi-conductive nylon wrapped partial shielding layer 12. In one embodiment, both the copper conductor 7 and the copper-nickel conductor 10 are single-wire conductors with a diameter of 0.51 mm or 0.81 mm. The thicknesses of both the first PFA polymer insulation layer 8 and the second PFA polymer insulation layer 11 are 0.3 mm, 0.4 mm or 0.5 mm. In one embodiment, both the first semi-conductive nylon wrapped partial shielding layer 9 and the second semi-conductive nylon wrapped partial shielding layer 12 are multi-layer overlapping wrapped structures of semi-conductive nylon tapes with an overlapping rate of 20% to 30%. The thicknesses of both the first semi-conductive nylon wrapped partial shielding layer 9 and the second semi-conductive nylon wrapped partial shielding layer 12 are 0.05 mm to 0.1 mm.

[0023] Outside the cable core, there are successively coated with an alkali-free glass fiber braided layer 3, a tinned copper wire wound total shielding layer 4, a superconducting carbon fiber coating layer 5, and a PFA polymer sheath 6. The tinned copper wire wound total shielding layer 4 is composed of an inner layer sector tinned copper wire winding layer and an outer layer sector tinned copper wire winding layer. A number of inner layer sector tinned copper wires are spirally wound side by side outside the alkali-free glass fiber braided layer 3 to form the inner layer sector tinned copper wire winding layer. A number of outer layer sector tinned copper wires are spirally wound side by side outside the inner layer sector tinned copper wire winding layer to form the outer layer sector tinned copper wire winding layer. The inner circumferential butt joint surfaces in contact between adjacent inner layer sector tinned copper wires and the outer circumferential butt joint surfaces in contact between adjacent outer layer sector tinned copper wires are arranged in a circumferential staggered manner. Further, the thickness of the inner layer sector tinned copper wire winding layer is less than the thickness of the outer layer sector tinned copper wire winding layer, and the cross-sectional area of the inner layer sector tinned copper wire is less than the cross-sectional area of the outer layer sector tinned copper wire. The shielding coverage rate of the tinned copper wire wound total shielding layer 4 is not less than 95%. The thickness of the PFA polymer sheath 6 is 0.8 mm to 1 mm. The outer diameter of the PFA polymer sheath 6 is 2.6 mm to 3.8 mm.

[0024] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

Claims

1. Single-pair twisted electromagnetic interference-resistant thermocouple cable, characterized in that: It includes a cable core formed by stranding a positive electrode wire (1) and a negative electrode wire (2). An alkali-free glass fiber braided layer (3), a tinned copper wire wound total shielding layer (4), a superconducting carbon fiber coating layer (5), and a PFA polymer sheath (6) are sequentially coated outside the cable core. The positive electrode wire (1) includes a copper conductor (7), a first PFA polymer insulating layer (8), and a first semi-conductive nylon wrapped partial shielding layer (9). The negative electrode wire (2) includes a copper-nickel conductor (10), a second PFA polymer insulating layer (11), and a second semi-conductive nylon wrapped partial shielding layer (12). The tinned copper wire wound total shielding layer (4) is composed of an inner layer sector-shaped tinned copper wire winding layer and an outer layer sector-shaped tinned copper wire winding layer. A plurality of inner layer sector-shaped tinned copper wires are spirally wound side by side outside the alkali-free glass fiber braided layer (3) to form the inner layer sector-shaped tinned copper wire winding layer. A plurality of outer layer sector-shaped tinned copper wires are spirally wound side by side outside the inner layer sector-shaped tinned copper wire winding layer to form the outer layer sector-shaped tinned copper wire winding layer. The inner circumferential butt joint surfaces in contact between adjacent inner layer sector-shaped tinned copper wires and the outer circumferential butt joint surfaces in contact between adjacent outer layer sector-shaped tinned copper wires are arranged in a circumferential staggered manner. The outer diameter of the PFA polymer sheath (6) is 2.6 mm to 3.8 mm.

2. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, wherein: Both the copper conductor (7) and the copper-nickel conductor (10) are single-wire conductors and have a diameter of 0.51 mm or 0.81 mm.

3. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The thicknesses of both the first PFA polymer insulating layer (8) and the second PFA polymer insulating layer (11) are 0.3 mm, 0.4 mm, or 0.5 mm.

4. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: Both the first semi-conductive nylon wrapped partial shielding layer (9) and the second semi-conductive nylon wrapped partial shielding layer (12) are semi-conductive nylon tape multi-layer overlapping wrapped structures with an overlapping rate of 20% to 30%.

5. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The thicknesses of both the first semi-conductive nylon wrapped partial shielding layer (9) and the second semi-conductive nylon wrapped partial shielding layer (12) are 0.05 mm to 0.1 mm.

6. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The thickness of the PFA polymer sheath (6) is 0.8 mm to 1 mm.

7. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The thickness of the inner layer sector-shaped tinned copper wire winding layer is less than the thickness of the outer layer sector-shaped tinned copper wire winding layer.

8. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The cross-sectional area of the inner layer sector-shaped tinned copper wire is less than the cross-sectional area of the outer layer sector-shaped tinned copper wire.

9. The single-pair twisted electromagnetic interference-resistant thermocouple cable according to claim 1, characterized in that: The shielding coverage rate of the tinned copper wire wound total shielding layer (4) is not less than 95%.

Images