Electromagnetic shielding flexible fabric, shielding seat and electronic equipment

Abstract

The invention discloses an electromagnetic shielding flexible fabric, a shielding seat and electronic equipment, and belongs to the technical field of electromagnetic shielding, the flexible fabric comprises a flexible shielding layer and a metal fiber layer attached to the flexible shielding layer; the metal fiber layer is made by adopting a twisted-pair fiber weaving or spinning process, the twisted-pair fiber comprises textile fiber and alloy fiber which are wound with each other, and the surface of the twisted-pair fiber is coated with a carbon nanotube layer; the flexible shielding layer comprises a flexible substrate, and the surface of the substrate is coated with an electromagnetic shielding layer; the twisted-pair fiber has relatively high conductivity, so that the number of absorbed and reflected parts of electromagnetic radiation is increased, and the problem of electromagnetic radiation secondary pollution of the metal fiber fabric is effectively reduced; and in addition, the flexible shielding layer and the metal fiber layer are made by adopting a weaving method, so that the flexible shielding cable has good shielding capability and good air permeability at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic shielding, and in particular to an electromagnetic shielding flexible fabric, a shielding seat and an electronic device. Background Art

[0002] With the rapid development of electric vehicles, their radiation issues have gradually attracted the attention of the public and the industry. The electromagnetic radiation generated by electric vehicles mainly comes from its battery system, motor controller, high-voltage cables and other components. Although the design and manufacture of these components follow strict electromagnetic compatibility (EMC) standards to ensure that they do not cause harm to the environment and human health during normal operation, with the increase in the number of electric vehicles and the advancement of technology, the monitoring and management of electromagnetic radiation has become increasingly important.

[0003] In addition, electric vehicle seats are becoming increasingly versatile, integrating multiple comfort functions such as heating, ventilation, and massage, and are even equipped with high-tech configurations such as touch screen control panels and wireless charging. The addition of these functions not only improves the riding experience, but also puts higher requirements on the electromagnetic environment inside the car. In order to ensure the safety and comfort of passengers, electric vehicle manufacturers need to take effective electromagnetic shielding measures during the seat design and manufacturing process to prevent electromagnetic interference from affecting the normal operation of electronic equipment inside the seat, while also protecting passengers from unnecessary electromagnetic radiation.

[0004] Therefore, with the continuous advancement of electric vehicle technology and the continuous expansion of the market, electromagnetic radiation issues and the need for electromagnetic shielding of seats will become important issues that cannot be ignored in the development of electric vehicles. The metal sheet shielding materials used in traditional electric vehicle seat shielding solutions have poor comfort, which will reduce the comfort of drivers and passengers during driving or riding to a certain extent, and traditional electromagnetic shielding solutions are not compatible with some new functional attributes of seats (such as massage, heating, ventilation, etc.). Summary of the invention

[0005] In response to the problems existing in the prior art, the present invention provides a flexible fabric, shielded seat and electronic equipment for electromagnetic shielding, which has a flexible structure and good air permeability, and solves the problem that the metal sheet shielding materials used in traditional shielding schemes have poor air permeability and comfort and are difficult to process.

[0006] The present invention is achieved through the following technical solutions: A flexible electromagnetic shielding fabric comprises a flexible shielding layer and a metal fiber layer attached to the flexible shielding layer; The metal fiber layer is made by a twisted fiber weaving or spinning process, wherein the twisted fiber comprises mutually entangled textile fibers and alloy fibers, and the surface of the twisted fiber is coated with a carbon nanotube layer; The flexible shielding layer comprises a flexible substrate, and the surface of the substrate is coated with an electromagnetic shielding layer.

[0007] Preferably, the flexible substrate is a fiber textile or a metal fiber layer.

[0008] Preferably, an electromagnetic shielding layer is sprayed on the surface of the textile fiber.

[0009] Preferably, the electromagnetic shielding layer is made of nanoparticles of soft magnetic material, including one of pure iron, low carbon steel, silicon steel sheet, iron-nickel alloy, iron-aluminum alloy, soft ferrite, and magnetic medium.

[0010] Preferably, the surface of the alloy fiber is coated with an anti-oxidation layer.

[0011] Preferably, the material of the anti-oxidation layer includes at least one of acrylic resin or polyimide.

[0012] Preferably, the alloy fibers include nickel-iron alloy fibers, copper alloy fibers, aluminum alloy fibers, silver alloy fibers, nickel alloy fibers, titanium alloy fibers, iron alloy fibers, stainless steel fibers, cobalt alloy fibers, niobium alloy fibers and copper-nickel alloy fibers.

[0013] Preferably, the diameter of the alloy fiber is 50um~200um.

[0014] A shielded seat comprises a seat and the electromagnetic shielding flexible fabric covering the seat.

[0015] An electronic device comprises the electromagnetic shielding flexible fabric.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present application provides an electromagnetic shielding flexible fabric, comprising a flexible shielding layer and a metal fiber layer attached to the flexible shielding layer, wherein textile fibers and alloy fibers are twisted to form double-strand fibers, and the metal fiber layer is woven with the double-strand fibers, and the electrical conductivity of the flexible fabric is improved by the alloy fibers, thereby enhancing the electromagnetic shielding capability of the flexible fabric; at the same time, an electromagnetic shielding layer is coated on the surface of the flexible substrate, and the electromagnetic shielding layer is made of soft magnetic material; the metal fiber layer utilizes the high electrical conductivity of the metal fiber and the metal plating layer to create a large impedance difference between the electromagnetic shielding layer and other propagation media, so that a more serious impedance mismatch occurs at the electromagnetic shielding layer in the propagation path of the electromagnetic wave, so that the electromagnetic wave is reflected at this boundary, so as to achieve the effect of electromagnetic shielding and realize good shielding capability for high-frequency electromagnetic fields and low-frequency electric fields; an electromagnetic shielding layer is coated on the surface of the flexible material layer, and the propagation of the low-frequency magnetic field is constrained by the excellent magnetic properties of the soft magnetic material, so as to achieve excellent electromagnetic shielding capability for electromagnetic fields of the entire frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the metal fiber layer of the electromagnetic shielding flexible fabric of the present invention; Figure 2 A schematic diagram of the twisted fiber structure of the electromagnetic shielding flexible fabric of the present invention; Figure 3 It is a schematic structural diagram of the magnetic material layer of the electromagnetic shielding flexible fabric of the present invention; Figure 4 This is a schematic diagram of the double-layer structure of the electromagnetic shielding flexible fabric of the present invention.

[0019] In the figure: 1-metal fiber layer, 2-twisted fiber, 3-woven fiber, 4-alloy fiber, 5-flexible substrate, 6-electromagnetic shielding layer, 7-flexible shielding layer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] Among the existing electromagnetic shielding solutions, metal fiber fabrics or textile fibers with metal coatings are usually the main solutions, which use the high conductivity of metal fibers and metal coatings to create a large impedance difference between the electromagnetic shielding layer and other propagation media, resulting in a more serious impedance mismatch at the electromagnetic shielding layer in the propagation path of the electromagnetic wave, causing the electromagnetic wave to be reflected at this boundary to achieve the electromagnetic shielding effect. However, the common stainless steel fiber among metal fibers has a low conductivity, so the shielding effect is relatively weak, and it is easy to cause secondary pollution of electromagnetic radiation.

[0024] In view of the above problems, the present application provides an electromagnetic shielding flexible fabric, comprising a flexible shielding layer 7, and a metal fiber layer 1 attached to the flexible shielding layer; The metal fiber layer 1 is made by weaving or spinning a pair of twisted fibers 2, wherein the twisted fibers include textile fibers 3 and alloy fibers 4 that are intertwined with each other, and the surface of the twisted fibers is coated with a carbon nanotube layer; The surface of the flexible substrate 5 is coated with an electromagnetic shielding layer 6 .

[0025] The electromagnetic shielding flexible fabric is obtained by twisting textile fibers 3 and alloy fibers 4 to form double-strand fibers. The alloy fibers are used to improve the conductivity of the flexible fabric and strengthen the electromagnetic shielding ability of the flexible fabric. The higher conductivity of the alloy fibers increases the amount of electromagnetic radiation absorbed and reflected, effectively reducing the problem of secondary pollution of electromagnetic radiation by the metal fiber fabric. Secondly, as the alloy fibers are gradually oxidized over time, their electromagnetic shielding ability is reduced. Therefore, an anti-oxidation layer is coated on the surface of the alloy fibers to increase the service life of the alloy fibers. In addition, a carbon nanotube layer is coated on the surface of the twisted fibers to enhance the metal fiber fabric's ability to absorb electromagnetic radiation and reduce secondary pollution of electromagnetic radiation caused by reflection of the metal fibers.

[0026] The textile fibers referred to in this application refer to fiber materials used for textile processing, which can be natural or synthetic. In the flexible fabric for electromagnetic shielding, the textile fibers mainly play the role of being intertwined with the alloy fibers to form a twisted structure, while maintaining the flexibility and wearability of the fabric.

[0027] In some embodiments, the textile fiber includes, but is not limited to, one of nylon, polyester, acrylic, spandex, vinylon, cotton fiber and viscose fiber, or a mixed textile fiber of at least two of the above textile fibers.

[0028] In some embodiments, an electromagnetic shielding layer 6 is sprayed on the surface of the textile fiber to increase the magnetic permeability of the textile fiber and enhance the fabric's ability to constrain the magnetic field, so that the low-frequency magnetic field portion of the electromagnetic radiation can be effectively constrained in this layer of fabric 7, achieving a more ideal shielding effect.

[0029] The electromagnetic shielding layer 6 is made of soft magnetic material, including one of pure iron, low carbon steel, silicon steel sheet, iron-nickel alloy, iron-aluminum alloy, soft ferrite, and magnetic medium.

[0030] In some embodiments, alloy fiber refers to a fibrous material composed of two or more metal elements, which has higher conductivity and mechanical strength than a single metal. Alloy fiber is a key component for providing electromagnetic shielding effect.

[0031] Alloy fibers include, but are not limited to, nickel-iron alloy fibers, copper alloy fibers, aluminum alloy fibers, silver alloy fibers, nickel alloy fibers, titanium alloy fibers, iron alloy fibers, stainless steel fibers, cobalt alloy fibers, niobium alloy fibers, and copper-nickel alloy fibers. Preferably, copper-nickel alloy fibers, wherein the diameter of the copper-nickel alloy fibers is 50 um to 200 um.

[0032] Alloy fiber may gradually oxidize over time during use, resulting in reduced electromagnetic shielding capability. Therefore, referring to optical fibers of similar size, adding a coating layer on the surface of the alloy fiber, which is composed of acrylic resin or polyimide and has a thickness of about 50um~250um, can effectively increase the service life of the alloy fiber.

[0033] In some embodiments, a carbon nanotube layer is formed on the surface of the twisted fiber by an impregnation method, and the mixing weight ratio of the carbon nanotubes is between 5% and 20%.

[0034] In order to solve the problem of secondary pollution of electromagnetic radiation of metal fiber fabrics, a carbon nanotube layer is coated on the surface of the twisted fiber to enhance the metal fiber fabric's ability to absorb electromagnetic radiation and reduce the secondary pollution of electromagnetic radiation caused by reflection of metal fibers.

[0035] In some embodiments, the flexible shielding layer 7 is made of fiber textile or metal, and is formed by dipping or spraying on the surface of the textile to form an electromagnetic shielding layer, and the electromagnetic shielding layer is an electromagnetic shielding absorption material.

[0036] Metal fibers have good shielding effects on electric fields and high-frequency magnetic fields, and can effectively achieve the shielding effect. However, for low-frequency magnetic fields, impedance mismatch cannot well complete the emission of low-frequency magnetic fields, resulting in insufficient electromagnetic shielding effects. Therefore, it is necessary to strengthen the shielding effect of low-frequency magnetic fields to ensure a better electromagnetic shielding effect. For this purpose, in order to ensure the air permeability and comfort of the fabric itself, ordinary fabric fibers are selected as the flexible substrate 5, and an electromagnetic shielding layer 6 is sprayed on the ordinary fabric to make a flexible shielding layer 7, thereby increasing the magnetic permeability of the fabric and enhancing the fabric's ability to constrain the magnetic field, so that the low-frequency magnetic field part in the electromagnetic radiation can be effectively constrained in this layer of fabric, achieving a more ideal shielding effect.

[0037] The electromagnetic shielding flexible fabric of the present application has good flexibility, can be bent and folded at will, can fit the curve of the human body well, etc., and is suitable for making wearable devices, electromagnetic shielding tooling, etc.; it has good air permeability. Compared with some metal sheet shielding materials, most flexible fabric electromagnetic shielding materials have certain air permeability and are more comfortable to wear or use; it has good processability and is easy to cut, sew and other processing operations. Compared with the existing electromagnetic shielding flexible fabrics on the market, not only does it use copper-nickel alloy fibers and carbon nanotubes in the use of metal fiber fabrics to improve the reflection and absorption capabilities of electric field radiation, thereby increasing the shielding capabilities of high-frequency electromagnetic waves and low-frequency electric field radiation, but it also introduces a flexible shielding layer and uses magnetic core material nanoparticles to enhance the magnetic conductivity of the fabric, thereby enhancing the shielding capabilities of low-frequency magnetic fields.

[0038] Example 1 A flexible electromagnetic shielding fabric, comprising a flexible shielding layer 7, and a metal fiber layer attached to a magnetic material layer; The metal fiber layer 1 is woven by using double-strand fibers in a warp and weft weaving manner. The double-strand fibers are twisted copper-nickel alloy fibers and textile fibers to obtain twisted double-strand fibers. A carbon nanotube layer is then formed on the surface of the twisted double-strand fibers by an impregnation method. The metal fiber layer 1 is then woven using the double-strand fibers with the carbon nanotube layer.

[0039] The flexible shielding layer 7 is based on textile fabric, and the electromagnetic shielding layer 6 is coated on the flexible substrate 5 by dipping or spraying. The material of the electromagnetic shielding layer 6 is ferrite nanoparticles.

[0040] The electromagnetic shielding flexible fabric selects twisted pair fibers obtained by twisting copper-nickel alloy fibers and ordinary textile fibers as the main textile material of the metal fiber layer, and coats carbon nanotubes on its surface to improve the metal fiber layer's ability to reflect and absorb electromagnetic radiation, and greatly reduce the secondary pollution of electromagnetic radiation by the metal shielding layer; secondly, ordinary textile cloth is selected as the substrate, and ferrite nanoparticles are evenly sprayed onto the ordinary textile cloth to improve its shielding ability against low-frequency magnetic fields, thereby improving the fabric's shielding ability against electromagnetic radiation.

[0041] Example 2 A flexible electromagnetic shielding fabric comprises a flexible shielding layer 7 and a metal fiber layer 1 attached to the flexible shielding layer; The twisted double fibers obtained by twisting copper-nickel alloy fibers and common textile fibers are used as the main textile material of the metal fiber layer, and the surface of the twisted double fibers is coated with carbon nanotubes.

[0042] With the metal fiber layer as a substrate, ferrite nanoparticles are uniformly sprayed onto the metal fiber layer to form a flexible shielding layer 7 .

[0043] Example 3 A flexible electromagnetic shielding fabric, comprising a flexible shielding layer 7, and a metal fiber layer attached to a magnetic material layer; The double-twisted fibers obtained by twisting nickel-iron alloy fibers and common textile fibers are used as the main textile material of the metal fiber layer, and the surface of the double-twisted fibers is impregnated with carbon nanotubes.

[0044] Using ordinary textile cloth as a substrate, ferrite nanoparticles are uniformly sprayed onto the ordinary textile cloth to form a flexible shielding layer 7 .

[0045] Example 4 A shielded seat comprises a seat and the electromagnetic shielding flexible fabric wrapped on the seat.

[0046] The shielded seat is a vehicle seat, and the vehicle seat is a new energy vehicle seat, a gasoline vehicle seat or an aviation seat.

[0047] The electromagnetic shielding flexible fabric of the present application is used in the vehicle cabin to shield the electromagnetic radiation of the internal electrodes of the vehicle seat and ensure the health of the driver and passengers. Therefore, while ensuring a good electromagnetic shielding effect, the air permeability and comfort of the fabric itself as a seat cover must also be ensured. Therefore, by using a blend of copper-nickel fiber, carbon nanotubes, and ordinary textile fibers, the air permeability and comfort of the fabric itself are ensured while ensuring a good shielding effect of electric fields and high-frequency magnetic fields.

[0048] Example 5 An electronic component comprises an electronic component body and the electromagnetic shielding flexible fabric coated on the electronic component body.

[0049] The electromagnetic shielding flexible fabric of the present application is applied to the electromagnetic shielding device of electronic components, and is used to shield the electromagnetic radiation of the surrounding components or the components themselves to the environment when the electronic components are working, so as to ensure that the components are not disturbed by electromagnetic radiation during normal operation, and ensure the electrical performance of the components. At the same time, due to the extremely strong deformability of the flexible fabric itself, it can be attached to the surface of the device housing of various shapes or be injection molded inside the device housing, and has good processability. While ensuring the shielding effect, the feasibility of the production process is improved.

[0050] Example 6 An electronic device comprises an electronic device body and the electromagnetic shielding flexible fabric wrapped thereon.

[0051] The electromagnetic shielding flexible fabric of the present application is applied to the electromagnetic shielding device of electronic equipment, and is used to shield the electromagnetic radiation of the surrounding environment of the electronic equipment when it is working, so as to ensure that the equipment is not interfered by the electromagnetic radiation when it is working normally, and to ensure the performance of the equipment. At the same time, because of the fabric characteristics of the flexible fabric itself, it can be well stored and carried with the instrument, which reduces the difficulty of carrying the equipment during transportation or when it is working under extremely harsh conditions.

[0052] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A flexible electromagnetic shielding fabric, characterized in that: It includes a flexible shielding layer, and a metal fiber layer attached to the flexible shielding layer; The metal fiber layer is made by a twisted fiber weaving or spinning process, wherein the twisted fiber comprises mutually entangled textile fibers and alloy fibers, and the surface of the twisted fiber is coated with a carbon nanotube layer; The flexible shielding layer comprises a flexible substrate, and the surface of the substrate is coated with an electromagnetic shielding layer.

2. The electromagnetic shielding flexible fabric according to claim 1, characterized in that: The flexible substrate is a fiber textile or a metal fiber layer.

3. The electromagnetic shielding flexible fabric according to claim 1 or 2, characterized in that: An electromagnetic shielding layer is sprayed on the surface of the textile fiber.

4. The electromagnetic shielding flexible fabric according to claim 3, characterized in that: The electromagnetic shielding layer is made of nanometer particles of soft magnetic material, including one of pure iron, low carbon steel, silicon steel sheet, iron-nickel alloy, iron-aluminum alloy, soft magnetic ferrite and magnetic medium.

5. The electromagnetic shielding flexible fabric according to claim 1, characterized in that: The surface of the alloy fiber is coated with an anti-oxidation layer.

6. The electromagnetic shielding flexible fabric according to claim 5, characterized in that: The material of the anti-oxidation layer includes at least one of acrylic resin and polyimide.

7. The electromagnetic shielding flexible fabric according to claim 1, characterized in that: The alloy fibers include nickel-iron alloy fibers, copper alloy fibers, aluminum alloy fibers, silver alloy fibers, nickel alloy fibers, titanium alloy fibers, iron alloy fibers, stainless steel fibers, cobalt alloy fibers, niobium alloy fibers and copper-nickel alloy fibers.

8. The electromagnetic shielding flexible fabric according to claim 1, characterized in that: The diameter of the alloy fiber is 50um~200um.

9. A shielded seat, characterized in that: A flexible electromagnetic shielding fabric comprising any one of claims 1-8.

10. An electronic device, characterized in that: A flexible electromagnetic shielding fabric comprising any one of claims 1-8.

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