Low-leakage shielding cable

Abstract

The invention, which relates to the technical field of the cable, provides a low-leakage shielding cable comprising a wire core, a first aluminum foil layer and a first copper mesh layer. The first aluminum foil layer is wrapped outside the wire core, the first copper mesh layer is wrapped outside the first aluminum foil layer, and nickel is plated outside copper wires of the first copper mesh layer. According to the invention, electromagnetic wave leakage from the inside can be reduced, and the shielding effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a low-leakage shielded cable. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of several or several groups of wires. There are many types of cables, among which shielded cables are transmission cables that use a metal mesh braided layer to wrap the signal line. The braided layer is usually red copper, but the shielding effect of the existing shielded cables is poor, which can easily lead to information leakage or interfere with the equipment in the same space. Summary of the invention

[0003] The object of the present invention is to provide a low-leakage shielded cable to solve the problems existing in the above-mentioned prior art, reduce the leakage of electromagnetic waves from the inside, and improve the shielding effect.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a low-leakage shielded cable, comprising: a conductor core, a first aluminum foil layer and a first copper mesh layer; the first aluminum foil layer is wrapped around the conductor core, the first copper mesh layer is wrapped around the first aluminum foil layer, and the copper wires of the first copper mesh layer are nickel-plated.

[0006] Preferably, the first copper mesh layer is woven from copper wires.

[0007] Preferably, the first aluminum foil layer is a single-sided aluminum foil layer; the conductive surface of the first aluminum foil layer faces the wire core.

[0008] Preferably, it also includes a second copper mesh layer; the second copper mesh layer is wrapped outside the first copper mesh layer.

[0009] Preferably, the copper wires of the second copper mesh layer are plated with nickel.

[0010] Preferably, it further includes a second aluminum foil layer, wherein the second aluminum foil layer is wrapped around the first copper mesh layer, and the second copper mesh layer is wrapped around the second aluminum foil layer.

[0011] Preferably, the second aluminum foil layer is a single-sided aluminum foil layer; the conductive surface of the second aluminum foil layer faces the wire core.

[0012] Preferably, the outermost layer is a cable sheath made of rubber material.

[0013] Preferably, a conductive wire is provided between the second copper mesh layer and the second aluminum foil layer and / or between the first copper mesh layer and the first aluminum foil layer; the conductive wire is used to electrically connect to the connectors at both ends of the wire core.

[0014] Preferably, the first aluminum foil layer, the first copper mesh layer, the second aluminum foil layer and the two ends of the second copper mesh layer are respectively used to wrap the connectors at the two ends of the wire core.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] In the present invention, the electromagnetic wave frequency range that can be isolated by the first aluminum foil layer is 10KHz~10MHz. When the frequency is below 1Mhz, the shielding effect can reach 70~90db. The electromagnetic wave frequency range that can be isolated by the copper mesh is 100Mhz~10Ghz. Within this range, the shielding effect can reach more than 60db. The electromagnetic wave frequency range that can be isolated by the nickel material is 1KHz~100Mhz. It has extremely high shielding effectiveness for low-frequency electromagnetic waves below 100Mhz, which can reach more than 80db. Therefore, the low-leakage shielded cable provided by the present invention has good shielding effect for electromagnetic waves in the frequency band below 10Ghz and low leakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a low-leakage shielded cable provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a low-leakage shielded cable provided in an embodiment of the present invention;

[0020] In the figure: 1-first aluminum foil layer; 2-first copper mesh layer; 3-second aluminum foil layer; 4-second copper mesh layer; 5-cable sheath; 6-conductive wire; 7-core one; 8-core two; 9-core three; 10-core four. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Combine the following Figure 1 to Figure 2 , describing an embodiment of the present invention.

[0024] The present invention provides a low-leakage shielded cable, such as Figure 1-2 As shown, it includes: a conductor core, a first aluminum foil layer 1 and a first copper mesh layer 2; the first aluminum foil layer 1 is wrapped around the conductor core, the first copper mesh layer 2 is wrapped around the first aluminum foil layer 1, and the copper wires of the first copper mesh layer 2 are nickel-plated.

[0025] The low-leakage shielded cable provided by the present invention fully considers the shielding effectiveness of each material. The electromagnetic wave frequency range that can be isolated by the first aluminum foil layer 1 is 10KHz~10MHz. When the frequency is below 1Mhz, the shielding effect can reach 70~90db. If the frequency of the electromagnetic wave exceeds the isolation range of the first aluminum foil layer 1, the corresponding electromagnetic wave will penetrate the first aluminum foil layer 1 and be transmitted to other areas, thereby causing electromagnetic wave leakage. Therefore, a first copper mesh layer 2 is added on the basis of the first aluminum foil layer 1. The electromagnetic wave frequency range that can be isolated by the first copper mesh layer 2 is 100Mhz~10Ghz. Within this range, the shielding effect can reach more than 60db. The electromagnetic wave frequency range that can be isolated by nickel material is 1KHz~100Mhz, and it has extremely high shielding effectiveness for low-frequency electromagnetic waves below 100Mhz, which can reach more than 80db. The use of this material can increase the low-frequency shielding effect of the cable by many times.

[0026] Secondly, the embodiment of the present invention performs nickel plating on the copper mesh, which not only ensures the high conductivity of the copper mesh, but also ensures that the nickel layer has a certain conductivity. The nickel layer can form a dense oxide film in the air to prevent oxidation of the copper layer and improve the reliability and shielding effectiveness of the product.

[0027] In summary, the present invention uses a variety of different materials to comprehensively shield electromagnetic waves with frequencies below 10 GHz, so as to reduce the leakage of electromagnetic waves inside the cable and the interference of external electromagnetic waves, and can improve the reliability of the product.

[0028] In some embodiments, the first copper mesh layer 2 is woven from copper wires.

[0029] The copper mesh layer provided in this embodiment is a woven copper mesh. The higher the weaving density, the better the shielding effectiveness. In some examples, a weaving density of 95% can achieve a shielding effectiveness of more than 80db, which greatly achieves shielding of internal electromagnetic waves.

[0030] In some embodiments, the first aluminum foil layer 1 is a single-sided aluminum foil layer; the conductive surface of the first aluminum foil layer 1 faces the wire core. The single-sided aluminum foil layer is formed by compounding an insulating layer on one side of the aluminum foil to increase the shielding effect, and the insulating layer can be a polyester film.

[0031] In the specific embodiment of the single-sided aluminum foil layer, a polyester film is used as the substrate, and a soft aluminum foil is laminated on one side of the substrate. According to the thickness of the aluminum foil, the single-sided aluminum foil layer can be divided into two types: 20u (0.022mm) and 25u (0.025mm). 20u (0.022mm) refers to aluminum foil 7u / polyester film 12u, and 25u (0.025mm) refers to aluminum foil 10u / polyester film 12u. In some examples, a 25u design is adopted to increase the thickness of the aluminum foil and thereby improve the shielding effect.

[0032] In order to further ensure information security, in some embodiments, the present invention further includes a second copper mesh layer 4; the second copper mesh layer 4 is wrapped outside the first copper mesh layer 2. The copper wires of the second copper mesh layer 4 are plated with nickel.

[0033] In this embodiment, the second copper mesh layer 4 is used to shield the high-frequency harmonics again.

[0034] In order to further ensure information security, the embodiments of the present invention in some embodiments further include a second aluminum foil layer 3 , the second aluminum foil layer 3 is wrapped outside the first copper mesh layer 2 , and the second copper mesh layer 4 is wrapped outside the second aluminum foil layer 3 .

[0035] In this embodiment, the second aluminum foil layer 3 is used to shield the low-frequency harmonics again, so that the overall shielding suppression effect can reach 99.99%, which fully meets the use conditions of important information security scenarios.

[0036] In some embodiments, the second aluminum foil layer 3 is a single-sided aluminum foil layer; the conductive surface of the second aluminum foil layer 3 faces the wire core.

[0037] In this embodiment, the second aluminum foil layer 3 and the first aluminum foil layer 1 have the same structure.

[0038] In some embodiments, the outermost layer is a cable sheath 5 made of rubber.

[0039] The cable sheath 5 in this embodiment is made of rubber material, which has the effects of environmental protection, flame retardancy, high toughness, high temperature resistance, tensile strength, and wear resistance.

[0040] In some embodiments, when in use, the second copper mesh layer 4, the second aluminum foil layer 3, the first copper mesh layer 2 and the first aluminum foil layer 1 need to be grounded to conduct interference signals or leakage signals into the ground, and a conductive wire 6 is arranged between the second copper mesh layer 4 and the second aluminum foil layer 3 and / or between the first copper mesh layer 2 and the first aluminum foil layer 1; the conductive wire 6 is used to electrically connect to the connectors at both ends of the wire core.

[0041] In this embodiment, the conductive wire 6 is preferably a copper wire. The copper wire is used to ensure the conductive continuity of the shielding layer of the entire shielded cable. In other words, the copper wire is used to prevent the shielding layer (the second copper mesh layer 4 and the second aluminum foil layer 3, the first copper mesh layer 2 and the first aluminum foil layer 1) from being broken, causing non-conductivity between the same shielding layers, so as to ensure the shielding effect.

[0042] In some embodiments, two ends of the first aluminum foil layer 1, the first copper mesh layer 2, the second aluminum foil layer 3, and the second copper mesh layer 4 are respectively used to wrap connectors at two ends of the wire core.

[0043] This embodiment can achieve the best shielding effectiveness of the entire device while ensuring the normal use of the cable.

[0044] In some embodiments, there are multiple wire cores, all of which are made of multiple strands of high-purity oxygen-free copper conductors, each strand of oxygen-free copper conductor has a diameter of ≤0.12 mm, and at least one of the wire cores transmits communication signals.

[0045] In some embodiments, the single-sided aluminum foil layer is preferably a single-sided high-quality aluminum foil layer, which is wound at 30°, and the overlap length is 1 / 2 of the width of the aluminum foil. It can be understood that the second aluminum foil layer 3 and the first aluminum foil layer 1 in the above embodiment can both adopt the single-sided high-quality aluminum foil layer described in this embodiment.

[0046] The production process of low-leakage shielded cable is described by taking four conductor cores as an example. The four conductor cores are core 1 7, core 2 8, core 3 9, and core 4 10. Core 1 7, core 2 8, core 3 9, and core 4 10 are all woven in a twisted pair. The twisted cores 1 7, core 2 8, core 3 9, and core 4 10 are wound at 30° using the first aluminum foil layer 1, and the overlap length is 1 / 2 of the width of the aluminum foil. The first copper mesh layer 2 is arranged outside the wound first aluminum foil layer 1, and a conductive wire 6 is pre-arranged between the first aluminum foil layer 1 and the first copper mesh layer 2. The second aluminum foil layer 3 is wound at 30° outside the first copper mesh layer 2, and the overlap length is 1 / 2 of the width of the aluminum foil. The second copper mesh layer 4 is arranged outside the wound second aluminum foil layer 3, and a conductive wire 6 is arranged between the second aluminum foil layer 3 and the second copper mesh layer 4. A cable sheath 5 is arranged outside the second copper mesh layer 4.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A low-leakage shielded cable, characterized in that: include: A conductor core, a first aluminum foil layer and a first copper mesh layer; the first aluminum foil layer is wrapped around the conductor core, the first copper mesh layer is wrapped around the first aluminum foil layer, and the copper wires of the first copper mesh layer are nickel-plated.

2. The low-leakage shielded cable according to claim 1, characterized in that: The first copper mesh layer is woven from copper wires.

3. The low-leakage shielded cable according to claim 1, characterized in that: The first aluminum foil layer is a single-sided aluminum foil layer; the conductive surface of the first aluminum foil layer faces the wire core.

4. The low-leakage shielded cable according to claim 1, characterized in that: It also includes a second copper mesh layer; the second copper mesh layer is wrapped outside the first copper mesh layer.

5. The low-leakage shielded cable according to claim 4, characterized in that: The copper wires of the second copper mesh layer are plated with nickel.

6. The low-leakage shielded cable according to claim 4, characterized in that: It also includes a second aluminum foil layer, wherein the second aluminum foil layer is wrapped outside the first copper mesh layer, and the second copper mesh layer is wrapped outside the second aluminum foil layer.

7. The low-leakage shielded cable according to claim 6, characterized in that: The second aluminum foil layer is a single-sided aluminum foil layer; the conductive surface of the second aluminum foil layer faces the wire core.

8. The low-leakage shielded cable according to claim 1, characterized in that: The outermost layer is a rubber cable sheath.

9. The low-leakage shielded cable according to claim 6, characterized in that: Conductive wires are arranged between the second copper mesh layer and the second aluminum foil layer and / or between the first copper mesh layer and the first aluminum foil layer; the conductive wires are used to electrically connect to connectors at both ends of the wire core.

10. The low-leakage shielded cable according to claim 6, characterized in that: The first aluminum foil layer, the first copper mesh layer, the second aluminum foil layer and the second copper mesh layer are respectively used to wrap the connectors at the two ends of the wire core.

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