Active cable used in low-frequency magnetic field interference environment

Abstract

The invention relates to the technical field of active cables, and discloses an active cable used in a low-frequency magnetic field interference environment. The active cable is provided with a plurality of battery cells, each battery cell comprises a pair of parallel wire assemblies, an outer shielding layer is arranged on the outer side of each wire assembly, and a wire pair shielding layer and a sheath layer are sequentially arranged on the outer side of each outer shielding layer in a sleeving mode; the wire assembly comprises an inner conductor and an inner shielding layer which are coaxially arranged, and the inner shielding layer wraps the outer side of the inner conductor; the inner surface of the outer shielding layer and the outer surface of the inner shielding layer form a cavity, and the cavity is filled with an insulating layer. And the inner shielding layer is made of a perovskite-PET (Polyethylene Terephthalate) material. According to the invention, the inner shielding layer is made of the perovskite-PET material, so that the low-frequency magnetic shielding performance of the cable can be improved, and meanwhile, the fireproof capability of the cable is also improved.

Description

Technical Field

[0001] The present invention relates to the field of communications, especially the field of active cables, and specifically to an active cable for use in an environment with low-frequency magnetic field interference. Background Art

[0002] An active cable refers to a cable that integrates active components, such as amplifiers, filters, etc. inside the cable to achieve some special functions. Compared with ordinary passive cables, active cables can provide the ability to amplify signals, filter, etc., enhancing the electrical signal transmission performance. Active cables are widely used in signal transmission in fields such as telecommunications, radio and television, military, aerospace, etc.

[0003] With the development and application in the field of communications, the communication industry has put forward higher requirements for the anti-external interference ability of active cables, and there is a market for active cables that can work normally under electromagnetic interference or extreme temperature environments. In terms of electromagnetic shielding, magnetic field waves are the most difficult to shield, especially low-frequency magnetic fields below 1 kHz, which are even more difficult to shield. Therefore, there is an urgent need for an active cable for use in an environment with low-frequency magnetic field interference. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art and provide an active cable for use in an environment with low-frequency magnetic field interference. In this active cable, the inner shielding layer is made of perovskite-PET material, which can improve the low-frequency magnetic shielding performance of the cable and also enhance the fire resistance ability of the cable.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] An active cable for use in an environment with low-frequency magnetic field interference has multiple electric cores. Each electric core includes a pair of wire assemblies arranged in parallel. An outer shielding layer is provided outside the wire assemblies, and a pair shielding layer and a sheath layer are sequentially sleeved outside the outer shielding layer;

[0007] The wire assembly includes a coaxial inner conductor and an inner shielding layer, and the inner shielding layer wraps outside the inner conductor;

[0008] A cavity is formed between the inner surface of the outer shielding layer and the outer surface of the inner shielding layer, and an insulating layer is filled in the cavity;

[0009] The inner shielding layer is made of perovskite-PET material.

[0010] Since the ceramics made of perovskite have many pores and slightly poor mechanical ability, it is easy to cause breakage and leakage, which in turn leads to the exposure of the inner conductor to low-frequency magnetic fields and the failure of electromagnetic shielding. The structure of the dense and tough protective layer perovskite-PET (polyethylene terephthalate) can avoid this problem, and PET itself has the best electromagnetic shielding ability among plastics.

[0011] Further, this active cable for a low-frequency magnetic field interference environment further includes a drainage wire made of tinned copper wire. The drainage wire is inserted into the outer shielding layer and is located in the center of a pair of wire assemblies.

[0012] Further, the inner conductor is a copper wire with a diameter ranging from 0.506 mm to 0.510 mm.

[0013] Further, the insulating layer is made of polyvinyl chloride material, and the thickness of the insulating layer is 0.30 mm to 0.35 mm.

[0014] Further, the outer shielding layer is made of copper material, and the thickness of the outer shielding layer is 0.10 mm to 0.30 mm.

[0015] Further, the pair shielding layer is made of tinned copper mesh. The outer diameter of the mesh wire of the tinned copper mesh ranges from 0.10 mm to 0.20 mm, and the braiding density of the tinned copper mesh should not be less than 85%. The tinned copper mesh can prevent external electromagnetic wave interference.

[0016] Further, the sheath layer is made of perfluoroethylene propylene copolymer (FEP), and the thickness of the sheath layer is 0.33 mm to 0.68 mm. The sheath layer can improve the high-temperature resistance of the cable.

[0017] Further, the preparation method of the perovskite-PET material includes the following:

[0018] Step S1: Prepare a solution of SrCO 3 solution, a solution of Fe 2 (NO 3 ) 3 ·4H 2 O, and a solution of MoO 3 ·H 2 O;

[0019] Step S2: Mix the SrCO 3 solution, the Fe 2 (NO 3 ) 3 ·4H 2 O solution, and the MoO 3 ·H 2 O solution prepared in Step S1 in a mass ratio of 4:1:2, and dissolve them in an oxalic acid solution with a pH value of 2 and a dissolution temperature of 80 °C to obtain a mixed acid solution;

[0020] Step S3: Add ethylene glycol at 90 - 100 °C to the mixed acid solution prepared in Step S2, and completely remove the water when a transparent gel is formed;

[0021] Step S4: Place the dehydrated transparent gel from Step S3 in an environment at 150 °C and dry it for 1 h to obtain a fluffy and porous resin.

[0022] Step S5: Heat the resin obtained in Step S4 at 500 °C for 30 min, and then perform a reduction heat treatment in a reducing atmosphere to reduce Mo 6+ to Mo 5+ and / or Fe 3+ to Fe 2+ , and the holding time for the reduction treatment is 2 - 4 h; to obtain a perovskite colloid.

[0023] Step S6: Mix and stir the perovskite colloid and molten PET in a mass ratio of 1:5 until evenly mixed to obtain a perovskite-PET material.

[0024] The above preparation method is a chemical method that can be prepared on a large scale. Large-scale preparation does not require such high purity and does not require high-precision equipment. Therefore, this preparation method can reduce the purification steps and detection links to save time costs and production costs.

[0025] Furthermore, in Step S1, the concentration of the SrCO 3 solution is 0.01 mol / L, the concentration of the Fe 2 (NO 3 ) 3 ·4H 2 O solution is 0.01 mol / L, and the concentration of the MoO 3 ·H 2 O solution is 0.01 mol / L.

[0026] Furthermore, in Step S5, the reducing atmosphere is a mixed gas of H 2 and Ar, and the volume percentage of H 2 is 5%.

[0027] The beneficial effects of the present invention are as follows: The present invention is reasonably designed and has the following advantages:

[0028] (1). The inner shielding layer is made of a perovskite-PET material, and the perovskite-PET material can enhance the ability of the active cable to resist low-frequency magnetic field interference during transmission and also has fire resistance;

[0029] (2). The pair shielding layer uses a tinned copper mesh to prevent external electromagnetic wave interference;

[0030] (3). With the rise of current artificial intelligence and the continuous expansion of scenario applications, the present invention can meet the layout efficiency and functional requirements of corresponding devices and has good economic benefits and social value. Description of the Drawings

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 is a schematic structural diagram of the longitudinal section of the present invention;

[0033] Figure 2 is a schematic structural diagram of the cross-section of the present invention.

[0034] In the figure: 1. Inner conductor, 2. Inner shielding layer, 3. Insulating layer, 4. Outer shielding layer, 5. Drain wire, 6. Pair shielding layer, 7. Sheath layer. Specific embodiments

[0035] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Embodiment 1

[0039] As Figure 1 and Figure 2An active cable for a low-frequency magnetic field interference environment as shown has multiple battery cores, and each battery core includes a pair of wire assemblies arranged in parallel. An outer shielding layer 4 is provided outside the wire assemblies, and a pair of wire shielding layers 6 and a sheath layer 7 are sequentially sleeved outside the outer shielding layer 4. The wire assembly includes a coaxially arranged inner conductor 1 and an inner shielding layer 2, and the inner shielding layer 2 is wrapped outside the inner conductor 1. The inner surface of the outer shielding layer 4 and the outer surface of the inner shielding layer 2 form a cavity, and the cavity is filled with an insulating layer 3. The inner shielding layer 2 is made of a perovskite-PET material.

[0040] In the perovskite-PET material, PET serves as the basic framework of this composite structure. On the one hand, it can improve the mechanical strength inside the cable, and on the other hand, it can form a dense thin film layer. The perovskite has good flame retardancy, which can improve the overall fire prevention ability and can also resist the interference of low-frequency magnetic fields.

[0041] This active cable for a low-frequency magnetic field interference environment further includes a drainage wire 5. The drainage wire 5 is made of tinned copper wire. The drainage wire 5 is inserted into the outer shielding layer 4 and is located in the center of a pair of wire assemblies.

[0042] The drainage wire 5 is made of tinned copper wire. The tinned copper wire can prevent the generation of verdigris. In addition, its material is soft and it has good electrical conductivity. The tinned copper wire has a long service life under weak current conditions.

[0043] The manufacturing process of the tinned copper wire is as follows: Select a copper wire with a diameter of 0.3 mm to 0.5 mm, and the surface is smooth and round. Then perform annealing, and the temperature is set at about 500 °C. The annealed copper wire is cleaned in an environment with a pH value of about 1.2 to ensure the adhesion of the tin layer and the copper wire. The copper wire is put into a tin furnace for calcination. After tin plating, it is cooled, and guide shaft oil is added to prevent the generation of tin ash. Finally, the tinned copper wire is drawn into a drainage wire 5 with a diameter of 0.3 mm to 0.5 mm.

[0044] The inner conductor 1 is a copper wire with a diameter of 0.510 mm.

[0045] The processing of the insulating layer 3 is specifically as follows: Polyvinyl chloride (PVC) is a non-crystalline material, and it is in a viscous flow state during insulation processing. At this time, the temperature of PVC is only 160 to 180 °C, and the perovskite-PET structure can resist temperatures much higher than this due to the flame retardancy of the perovskite material. Therefore, there is no need to worry that the perovskite-PET material will be damaged during the production process. For the PVC insulating layer 3, the thickness attached to the outside of the inner shielding layer 2 is 0.35 mm.

[0046] The outer shielding layer 4 is made of copper material and is wrapped outside the insulating layer 3 by plastic electroplating method. The thickness of the outer shielding layer 4 is 0.30 mm 。

[0047] The pair of wire shielding layer 6 is made of tinned copper mesh. The outer diameter of the wire of the tinned copper mesh is 0.20 mm, and the braiding density of the tinned copper mesh should not be less than 85%. The tinned copper mesh can prevent external electromagnetic wave interference.

[0048] The sheath layer 7 is made of perfluoroethylene propylene copolymer. The thickness of the sheath layer 7 is 0.68 mm. The sheath layer 7 is extruded outside the pair of wire shielding layer 6 to improve the high temperature resistance of the cable.

[0049] The above-mentioned perovskite-PET material includes the following preparation method:

[0050] Step S1, prepare SrCO 3 solution, Fe 2 (NO 3 ) 3 ·4H 2 O solution and MoO 3 ·H 2 O solution;

[0051] Step S2, mix the SrCO 3 solution, Fe 2 (NO 3 ) 3 ·4H 2 O solution and MoO 3 ·H 2 O solution prepared in step S1 according to a mass ratio of 4:1:2, and dissolve them in an oxalic acid solution. The pH value of the oxalic acid solution is 2, and the dissolution temperature is 80 °C to obtain a mixed acid solution;

[0052] Step S3, add ethylene glycol at 90-100 °C to the mixed acid solution prepared in step S2, and when a transparent gel is formed, completely remove the water;

[0053] Step S4, place the transparent gel after water removal in step S3 in an environment of 150 °C and dry it for 1 h to obtain a fluffy and porous resin;

[0054] Step S5, heat the resin prepared in step S4 at 500 °C for 30 min, and then perform reduction heat treatment in a reducing atmosphere (5% H 2 / Ar) to reduce Mo 6+ to Mo 5+ and / or reduce Fe 3+ to Fe 2+ , and the heat preservation time of the reduction treatment is 2-4 h; obtain a perovskite colloid, and the chemical formula of the perovskite is Sr 2 FeMoO 6 ;

[0055] Step S6: Mix and stir perovskite colloid and molten PET in a mass ratio of 1:5 until evenly mixed to obtain a perovskite-PET material.

[0056] In step S1, the concentration of SrCO 3 solution is 0.01 mol / L, and the concentration of Fe 2 (NO 3 ) 3 ·4H 2 O solution is 0.01 mol / L, and the concentration of MoO 3 ·H 2 O solution is 0.01 mol / L; in step S5, the reducing atmosphere is a mixed gas of H 2 and Ar, and the volume percentage of H 2 is 5%.

[0057] In summary, the design of the present invention is reasonable and has the following advantages:

[0058] (1) The inner shielding layer 2 is made of perovskite-PET material, which can enhance the ability of the active cable to resist low-frequency magnetic field interference during transmission and has fireproof ability at the same time;

[0059] (2) The pair shielding layer uses tinned copper mesh to prevent external electromagnetic wave interference;

[0060] (3) With the rise of current artificial intelligence and the continuous expansion of scenario applications, the present invention can meet the layout efficiency and functional requirements of corresponding devices, and has good economic benefits and social value.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active cable for use in a low-frequency magnetic field interference environment, characterized in that: A plurality of battery cores are provided, each of which comprises a pair of parallel wire assemblies, an outer shielding layer (4) is provided on the outer side of the wire assembly, and a wire pair shielding layer (6) and a sheath layer (7) are sequentially sheathed on the outer side of the outer shielding layer (4); The wire assembly comprises an inner conductor (1) and an inner shielding layer (2) which are coaxially arranged, and the inner shielding layer (2) is wrapped around the outer side of the inner conductor (1); The inner surface of the outer shielding layer (4) and the outer surface of the inner shielding layer (2) form a cavity, and the cavity is filled with an insulating layer (3); The inner shielding layer (2) is made of perovskite-PET material.

2. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: It also includes a drain wire (5), which is made of tinned copper wire. The drain wire (5) is inserted into the outer shielding layer (4) and is located in the center of a pair of wire assemblies.

3. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The inner conductor (1) is a copper wire with a diameter of 0.506 mm to 0.510 mm.

4. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The insulating layer (3) is made of polyvinyl chloride material, and the thickness of the insulating layer (3) is 0.30 mm to 0.35 mm.

5. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The outer shielding layer (4) is made of copper material, and the thickness of the outer shielding layer (4) is 0.10 mm to 0.30 mm.

6. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The wire pair shielding layer (6) is made of tinned copper mesh, the outer diameter of the mesh wire of the tinned copper mesh is in the range of 0.10 mm to 0.20 mm, and the weaving density of the tinned copper mesh should not be less than 85%.

7. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The sheath layer (7) is made of polyperfluoroethylene propylene copolymer, and the thickness of the sheath layer (7) is 0.33 mm to 0.68 mm.

8. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: The perovskite-PET material includes the following preparation method: Step S1, preparing SrCO3 solution, Fe2(NO3)3·4H2O solution and MoO3·H2O solution; Step S2, mixing the SrCO3 solution, Fe2(NO3)3·4H2O solution and MoO3·H2O solution obtained in step S1 in a mass ratio of 4:1:2, and dissolving them in an oxalic acid solution, wherein the pH value of the oxalic acid solution is 2 and the dissolution temperature is 80° C., to obtain a mixed acid solution; Step S3, adding ethylene glycol at 90-100° C. to the mixed acid solution obtained in step S2, and when a transparent gel is formed, completely removing water; Step S4, drying the transparent gel after dehydration in step S3 at 150° C. for 1 hour to obtain a fluffy porous resin; Step S5, heating the resin obtained in step S4 at 500°C for 30 minutes, and then performing a reduction heat treatment in a reducing atmosphere to remove Mo 6+ Restore to Mo 5+ and / or Fe 3+ Reduction to Fe 2+ , the heat preservation time of reduction treatment is 2 to 4 hours; the perovskite colloid is obtained; Step S6, mixing and stirring the perovskite colloid and the molten PET in a mass ratio of 1:5 until they are evenly mixed to obtain a perovskite-PET material.

9. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: In step S1, the concentration of the SrCO3 solution is 0.01 mol / L, the concentration of the Fe2(NO3)3·4H2O solution is 0.01 mol / L, and the concentration of the MoO3·H2O solution is 0.01 mol / L.

10. The active cable for use in a low-frequency magnetic field interference environment according to claim 1, characterized in that: In step S5, the reducing atmosphere is a mixed gas of H2 and Ar, wherein the percentage of H2 is 5%.

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