Multi-layer structure of broadband anti-electromagnetic radiation automobile foot mat

Abstract

The utility model provides a multi-layer structure of a broadband anti-electromagnetic radiation automobile foot mat, which comprises a flannelette layer, a first low-frequency electromagnetic radiation protection layer, a high-frequency electromagnetic radiation protection layer, a second low-frequency electromagnetic radiation protection layer and a fleece stab cloth layer which are sequentially stacked, and the layers are adhered through polyurethane pressure-sensitive adhesive or acrylic acid pressure-sensitive adhesive. The high-frequency electromagnetic radiation protection layer and the low-frequency electromagnetic radiation protection layer have a synergistic effect, so that electromagnetic radiation from low frequency to high frequency can be effectively protected, the electromagnetic radiation protection range in an automobile is widened, and the electromagnetic safety of the environment in the automobile is remarkably improved. Compared with the traditional anti-radiation technology, the material has the advantages of wide coverage frequency band, convenience in installation, lasting protection and the like, and is suitable for any vehicle type such as an extended-range electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, a traditional oil vehicle and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile interior electromagnetic radiation protection, especially to a wideband anti-electromagnetic radiation automobile foot mat multilayer structure. BACKGROUND

[0002] Electromagnetic radiation is called the "invisible killer" of the 21st century, and it is urgent to explore effective methods to protect the interior electromagnetic radiation of electric vehicles. Existing host factories solve electromagnetic compatibility and electromagnetic radiation problems by complex electrical architecture design and high-cost high-density magnetic ring deployment. Directly coating a light electromagnetic shielding material on the surface of the emission source can directly solve the problem of electromagnetic compatibility and electromagnetic radiation. Existing research shows that using materials with high electrical conductivity and high magnetic permeability in the cabin of an electric vehicle can effectively shield the electromagnetic waves emitted outward by the high-voltage system and the direct bus of the electric vehicle, thereby protecting the human body. Existing research on electromagnetic shielding coatings is mostly concentrated in the 100 MHz-18 GHz medium-high frequency range, and the development and application of medium-low frequency electromagnetic shielding coatings are relatively limited.

[0003] The electromagnetic wave frequency in the cabin of an electric vehicle is in the 9KHz-30MHz frequency range, which belongs to a medium-low frequency electromagnetic field. When an electric vehicle is in emergency acceleration or emergency braking, a stronger electromagnetic field will be excited in space due to the sudden change of current in the power system. In addition, when an electric vehicle is connected to a charging pile for charging, the electromagnetic radiation around and inside the cabin will also be significantly increased, and the electromagnetic field exposure value of the human body in the car or in the cabin will significantly exceed the exposure limit value specified by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). ICNIRP has requirements for the exposure limit of radio frequency (100KHz-300GHz) electromagnetic field, considering that the human body exposed to an electromagnetic environment above 0.1 μT will have biological effects on the human body, and with the passage of time, cumulative effects will occur. The electromagnetic environment control limit GB 8702-2014 of the People's Republic of China National Standard clearly requires public electromagnetic exposure limits in the 1 Hz-300GHz frequency range, and in the 9KHz-30MHz frequency range, the public magnetic field exposure limit is not more than 1 μT, and the public electric field exposure limit is not more than 100V / m.

[0004] In the prior art, medium and high frequency electromagnetic radiation protection materials are relatively common. The China Shipbuilding Research and Design Center discloses a super-wideband electromagnetic shielding coating material, which has excellent low-frequency electromagnetic shielding and high-frequency electromagnetic shielding effects. However, the material is relatively thick, and lacks performance characterization data in the 10Hz to 100KHz frequency band. Most shielding materials have many shortcomings in practical application, such as: the installation of shielding equipment is complex, the vehicle needs to be modified; the coverage is limited and cannot cope with low and high frequency radiation at the same time; or the material is heavy, increasing the load of the vehicle, and is not suitable for long-term use. In addition, most traditional electromagnetic shielding schemes are difficult to balance the convenience of use and the rational use of vehicle interior space. In view of the above problems, a composite material with an independent structure is developed, which realizes wideband electromagnetic shielding performance through modular design, and has the characteristics of lightness, durability and convenient installation, which is the key demand to solve the problem of electromagnetic radiation in the vehicle. Practical new type content

[0005] The utility model aims at providing a kind of wideband anti-electromagnetic radiation's automobile foot mat multilayer structure, by multilayer structure design, anti-radiation function material is integrated to automobile foot mat bottom, to give foot mat excellent electromagnetic shielding performance, effectively reduce the radiation amount released when vehicle bottom component operates, improve the safety of electromagnetic environment in vehicle.The multilayer structure is composed of five functional materials, with stability and wideband electromagnetic shielding performance.The upper layer is composed of a surface layer of flannel, and the surface flannel layer design can be firmly combined with the burr layer at the bottom of the automobile foot mat, so that the upper layer of the multilayer structure is stably connected to the bottom of the foot mat.The bottom layer is a burr burr layer, and the dense burr structure at the bottom can be tightly combined with the flannel on the surface of the original foot mat of the automobile, forming a good anti-skid effect.The upper and lower layers work together to enable the multilayer structure to be stably embedded in the bottom layer of the foot mat, avoiding sliding or falling off.The second layer and the fourth layer are low-frequency electromagnetic protection coating, composed of soft magnetic material filler and polyurethane resin matrix, which provides effective shielding for low-frequency magnetic field radiation in the vehicle.The low coercive force and high magnetic permeability characteristics of the soft magnetic material enable the multilayer structure to exhibit excellent magnetic shielding performance in the low-frequency band, further strengthening the protection effect of low-frequency magnetic field.The middle layer is a high-frequency protection layer, which covers the electromagnetic shielding range of 30MHz to 18GHz, covering the medium and high frequency electromagnetic wave band, significantly reducing the multi-band electromagnetic radiation received by the human body in the vehicle.Combining the high-frequency protection layer and the low-frequency protection coating forms a wideband electromagnetic shielding system, providing all-round electromagnetic protection for the vehicle.The third layer of high-frequency electromagnetic shielding protection layer is made of fiber cloth by electrochemical deposition.The overall design of the obtained multilayer structure integrates stability, durability and high-efficiency shielding performance, and is suitable for various types of automobile foot mat.

[0006] Compared with the electromagnetic radiation prevention foot pad on the market, the multi-layer structure of the foot pad is an independent structure, the multi-layer structure is light in texture, does not occupy the space of the feet of the automobile, has excellent stability, and does not directly contact the feet of the human body, almost does not wear and has a long service life.

[0007] Specifically, the utility model provides the following technical scheme to realize the above-mentioned purpose:

[0008] A multi-layer structure of a wideband electromagnetic radiation prevention automobile foot pad, comprising a velvet layer, a first low-frequency electromagnetic radiation prevention layer, a high-frequency electromagnetic radiation prevention layer, a second low-frequency electromagnetic radiation prevention layer and a plush burr cloth layer which are sequentially stacked, and the layers are bonded by polyurethane pressure-sensitive adhesive or acrylic pressure-sensitive adhesive.

[0009] Further, the high-frequency electromagnetic radiation prevention layer is made of any one of polyester fabric, aramid fabric, spandex fabric, bamboo fiber fabric, modal fiber fabric and copper ammonia fiber fabric and is processed by electrodeposition alloy.

[0010] Further, the alloy is any one of nickel-iron alloy, nickel-iron-cobalt alloy, nickel-cobalt alloy and iron-cobalt alloy.

[0011] Further, the velvet layer is made of any one of polyester, polypropylene and nylon.

[0012] Further, the plush burr cloth layer is made of any one of nylon, polyester, polypropylene and PVC.

[0013] Further, the first low-frequency electromagnetic radiation prevention layer and the second low-frequency electromagnetic radiation prevention layer are both composed of soft magnetic filler and resin matrix; the soft magnetic filler is any one of ferrite, high-purity iron powder, iron-silicon-aluminum alloy powder, iron-nickel alloy powder, iron-cobalt alloy powder, nanocrystalline soft magnetic material, soft magnetic silicon steel powder and rare earth soft magnetic material; and the resin matrix is any one of polyurethane resin and acrylic resin.

[0014] The utility model has the following beneficial effects:

[0015] (1) Excellent electromagnetic shielding performance: through the combination of soft magnetic filler and electrodeposition alloy material, the multi-layer structure realizes wideband electromagnetic shielding, effectively covers low-frequency to medium-high frequency (9kHz to 18GHz) electromagnetic radiation, and significantly reduces the influence of automobile bottom radiation on human health.

[0016] (2) Light and stability: the material is designed to be light and thin, the overall multi-layer structure is light in texture, does not occupy the space of the feet of the car, and provides stable anti-skid fixing effect through the synergistic effect of the upper and lower layers to avoid sliding.

[0017] (3) Long service life: the multi-layer structure is not in direct contact with the feet of the human body, has wear resistance and long-term use characteristics, reduces wear and tear, and prolongs the service life of the product.

[0018] (4) High convenience: the foot pad adopts an independent structure, the car owner can install and disassemble it by himself without the help of professional tools, is suitable for various types of car foot pads, and improves the practicality and operation convenience.

[0019] (5) Safety and environmental protection: the multi-layer structure improves the electromagnetic environment in the car through the high-efficiency electromagnetic shielding function, improves the safety and health in the car, and the material is environmentally friendly and harmless, which meets the high standard requirements of modern automobile products. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a front view schematic diagram of the multi-layer structure of the wideband electromagnetic radiation prevention automobile foot pad of the utility model;

[0021] Figure 2 is a sectional view schematic diagram of the multi-layer structure of the wideband electromagnetic radiation prevention automobile foot pad of the utility model;

[0022] Figure 3 is the electromagnetic radiation measurement data of the multi-layer structure of the wideband electromagnetic radiation prevention automobile foot pad of the utility model. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made. These all belong to the protection scope of the utility model.

[0024] The embodiment provides a wideband electromagnetic radiation prevention automobile foot pad multi-layer structure, and the structure is shown in the accompanying drawings: Figure 1 and 2 The utility model discloses a wideband electromagnetic radiation prevention automobile foot pad multi-layer structure, which comprises a velvet layer 1, a first low-frequency electromagnetic radiation protection layer 2, a high-frequency electromagnetic radiation protection layer 3 and a second low-frequency electromagnetic radiation protection layer 4 which are connected in sequence from the surface layer to the bottom layer. Figure 3 It is the measured magnetic field intensity value of the central surface of the seat cushion of the front, rear, left and right seats of the Tesla Model 3 four-wheel drive version car under the condition of sudden acceleration. The test value unit is muT.

[0025] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application.

Claims

1. A multi-layer structure of an automobile foot mat for preventing electromagnetic radiation, characterized by comprising: a first layer of a conductive material; a second layer of a non-conductive material; and a third layer of a conductive material. The application relates to a multi-layer electromagnetic radiation protection fabric, which comprises a velvet layer, a first low-frequency electromagnetic radiation protection layer, a high-frequency electromagnetic radiation protection layer, a second low-frequency electromagnetic radiation protection layer and a plush fabric layer which are stacked in sequence.

2. The multi-layered structure of claim 1, wherein, The high-frequency electromagnetic radiation protection layer is made of any one of polyester fabric, aramid fabric, spandex fabric, bamboo fiber fabric, modal fiber fabric and cuprammonium rayon fabric and is treated by electrodeposition alloy.

3. The multi-layered structure of claim 2, wherein the multi-layered structure is made of a material that is capable of reflecting electromagnetic waves in the frequency range of 30 MHz to 300 GHz. The alloy is any one of nickel-iron alloy, nickel-iron-cobalt alloy, nickel-cobalt alloy and iron-cobalt alloy.

4. The multi-layered structure of claim 1, wherein the multi-layered structure is made of a material that is capable of reflecting electromagnetic waves in the frequency range of 30 MHz to 300 GHz. The velvet layer is made of any one of polyester, polypropylene and nylon.

5. The multi-layered structure of claim 1, wherein the multi-layered structure is made of a material that is capable of reflecting electromagnetic waves in the frequency range of 30 MHz to 300 GHz. The plush fabric layer is made of any one of nylon, polyester, polypropylene and PVC.

6. The multi-layered structure of claim 1, wherein the multi-layered structure is made of a material that is capable of reflecting electromagnetic waves in the frequency range of 30 MHz to 300 GHz. The first low-frequency electromagnetic radiation protection layer and the low-frequency electromagnetic radiation protection layer are both composed of soft magnetic filler and resin matrix; the soft magnetic filler is any one of ferrite, high-purity iron powder, iron-silicon-aluminum alloy powder, iron-nickel alloy powder, iron-cobalt alloy powder, nanocrystalline soft magnetic material, soft magnetic silicon steel powder and rare earth soft magnetic material; and the resin matrix is any one of polyurethane resin and acrylic resin.

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