High-temperature-resistant flame-retardant radio frequency cable

Abstract

The utility model relates to a high-temperature-resistant flame-retardant radio frequency cable, which comprises an electric conductor and multiple stages of insulating layers coaxially coated outside the electric conductor, one insulating layer is arranged at the outermost layer, at least one stage of shielding layer is arranged among the multiple stages of insulating layers at intervals, and a flame-retardant layer is arranged at least close to the inner side of the outermost insulating layer. By arranging the multi-stage insulating layers with the high-temperature-resistant characteristic and the flame-retardant layers with the flame-retardant characteristic, it is guaranteed that the cable has anti-interference, high-strength, corrosion-resistant, high-temperature-resistant and flame-retardant performance, the cable can be used for a long time in a special environment, and by arranging the first shielding layer and the second shielding layer between the multi-stage insulating layers, the service life of the cable is prolonged. A broadband shielding system can be jointly formed, wide interference frequency spectrums from low frequency to high frequency are effectively covered, and the anti-interference capability of the radio frequency cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of communication cables, and particularly relates to a radio frequency cable for high temperature resistance and flame retardance. Background Art

[0002] A radio frequency cable is a cable for transmitting high-frequency signals and plays an important role in network transmission and communication. When facing extreme temperature conditions, electromagnetic interference (EMI) and fire safety requirements, a radio frequency cable often exposes a series of limitations, such as a decline in insulation performance, deterioration of signal transmission quality, and an increase in fire risk. In addition, the existing radio frequency cables still need to be further enhanced in terms of anti-interference ability and flame retardant safety in a complex electromagnetic environment. Especially in a high-frequency communication system, it is difficult to effectively cover and shield a wide range of interference spectra. Content of the Utility Model

[0003] I. Technical Problems to be Solved

[0004] The purpose of the utility model is to provide a radio frequency cable for high temperature resistance and flame retardance, which has high temperature resistance, good flame retardant characteristics, can cover a wide range of interference spectra, and has anti-interference ability.

[0005] II. Technical Solutions

[0006] The utility model is realized through the following technical solutions:

[0007] The utility model provides a radio frequency cable for high temperature resistance and flame retardance, which includes an electrical conductor, and a multi-stage insulating layer coaxially coated outside the electrical conductor, and one of the insulating layers is arranged on the outermost layer. At least one stage of shielding layer is arranged at intervals between the multi-stage insulating layers, and a flame retardant layer is arranged at least on the inner side close to the outermost insulating layer.

[0008] Furthermore, the insulating layer sequentially includes a first insulating layer, a second insulating layer and a third insulating layer from inside to outside. The first insulating layer is tightly coated outside the electrical conductor, and the third insulating layer is arranged on the outermost layer. A first shielding layer and a second shielding layer are respectively arranged on the inner wall and the outer wall close to the second insulating layer. The first shielding layer and the second shielding layer are used to resist electromagnetic interference of different frequency interference spectra.

[0009] Furthermore, the flame retardant layer is arranged between the second shielding layer and the third insulating layer, and the flame retardant layer is woven or wound with a non-halogen fiberglass tape with a thickness of 0.2 mm.

[0010] Furthermore, the material of the first shielding layer is copper, and the material of the second shielding layer is iron.

[0011] Furthermore, the first shielding layer is formed by twisting braided copper wires or curling perforated thin copper sheets; the second shielding layer is formed by twisting braided iron wires or curling thin iron sheets.

[0012] Furthermore, the insulating layer is formed by extrusion of perfluoroethylene propylene or cross-linked polyethylene, and the multi-stage insulating layers are made of the same or different materials.

[0013] Furthermore, it includes a conductor and a first insulating layer coated on the outside of the conductor. The conductor and the first insulating layer together form an insulating core. A first shielding layer is commonly coated on the outside of multiple insulating cores, and a second insulating layer, a second shielding layer, a flame retardant layer, and a third insulating layer are coaxially coated on the outside of the first shielding layer in sequence from inside to outside.

[0014] Furthermore, the materials of the first shielding layer and the second shielding layer are copper and iron respectively, which are used to resist electromagnetic interference of different frequency interference spectrums.

[0015] III. Beneficial Effects

[0016] The utility model has the following beneficial effects compared with the prior art:

[0017] 1. By setting multi-stage insulating layers with high temperature resistance characteristics and a flame retardant layer with flame retardant characteristics, the cable is ensured to have the properties of anti-interference, high strength, corrosion resistance, high temperature resistance and flame retardance, and can meet the long-term use in special environments.

[0018] 2. By setting a first shielding layer and a second shielding layer between multi-stage insulating layers, a wide-band shielding system can be jointly formed, effectively covering a wide range of interference spectrums from low frequency to high frequency, and improving the anti-interference ability of the RF cable. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 is Figure 1 the middle cross-sectional view of

[0021] Figure 3 is the middle cross-sectional view of another embodiment of the utility model;

[0022] 1. Conductor; 2. Insulating layer; 201. First insulating layer; 202. Second insulating layer; 203. Third insulating layer; 3. Shielding layer; 301. First shielding layer; 302. Second shielding layer; 4. Flame retardant layer. Specific Embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] A radio frequency cable for high temperature resistance and flame retardancy, please refer to Figure 1-2 , which includes a conductor 1, and a multi-stage insulating layer is coaxially coated outside the conductor 1. The conductor 1 is a copper conductor drawn and annealed from oxygen-free copper, or a good conductor material such as silver;

[0025] The insulating layer is extruded with perfluoroethylene propylene (FEP) or cross-linked polyethylene (XLPE). The multi-stage insulating layer can use the same or different high temperature resistant materials, preferably perfluoroethylene propylene. This material has high electrical properties, is suitable for use at high frequencies, is corrosion-resistant, can maintain stable performance in various chemical substances and high temperature environments, is wear-resistant and impact-resistant, and can withstand various mechanical stresses, thus effectively protecting the cable. One insulating layer 2 is arranged on the outermost layer. This insulating layer 2 as an outer sheath can effectively block high temperature, improve wear resistance and withstand various mechanical stresses.

[0026] As an implementation mode of the present utility model, the insulating layer 2 sequentially includes a first insulating layer 201, a second insulating layer 202 and a third insulating layer 203 from the inside to the outside. The first insulating layer 201 is tightly coated outside the conductor 1, and the third insulating layer 203 is arranged on the outermost layer. At least one stage of shielding layer is arranged at intervals between the multi-stage insulating layers, and a flame retardant layer 4 is arranged at least on the inner side close to the outermost insulating layer (the third insulating layer 203). The shielding layer 3 is used to shield electromagnetic interference, ensure the attenuation and crosstalk of signal transmission, improve signal quality, and ensure the accuracy and reliability of data transmission.

[0027] A first shielding layer 301 and a second shielding layer 302 are respectively arranged on the inner wall and the outer wall close to the second insulating layer 202. The first shielding layer 301 and the second shielding layer 302 are used to resist electromagnetic interference of different frequency interference spectra. Specifically, the material of the first shielding layer 301 is copper, and the material of the second shielding layer 302 is iron. Preferably, the first shielding layer 301 is a copper mesh shielding layer formed by braiding and stranding copper wires with a diameter of 0.18 - 0.2 mm or a copper sheet shielding layer formed by curling a perforated thin copper sheet; the second shielding layer 302 is an iron mesh shielding layer formed by braiding and stranding iron wires with a diameter of 0.2 mm or an iron sheet shielding layer formed by curling a thin iron sheet. Among them, the braided iron mesh is braided with 0.2 mm galvanized iron wire, and the braided copper mesh is braided with tough copper wire.

[0028] Among them, the copper first shielding layer 301 is close to the inner layer, which can provide good electromagnetic shielding for the internal signals of the cable in the low-frequency to medium-frequency range, reduce the interference of external electromagnetic fields on the signals inside the cable, and at the same time limit the radiation of the internal signals of the cable to the outside; while the iron second shielding layer 302 is located in the outer layer, which can more effectively guide and disperse magnetic field interference in the high-frequency range; thus, by setting different shielding layers, a broadband shielding system can be jointly formed to effectively cover a wide range of interference spectra from low frequency to high frequency.

[0029] In this embodiment, the flame-retardant layer 4 is disposed between the second shielding layer 302 and the third insulating layer 203. That is, in this embodiment, from the inside to the outside, the electrical conductor 1, the first insulating layer 201, the second insulating layer 202, the second shielding layer 302, the flame-retardant layer 4, and the third insulating layer 203 are sequentially arranged. The flame-retardant layer 4 is woven or wound with a halogen-free fiberglass tape having a thickness of 0.2 mm. The halogen-free fiberglass tape does not contain halogens, produces less toxic gas when burned, has a relatively high flame-retardant grade, and can quickly prevent the spread of flames when encountering fire, effectively protecting the safety of equipment and personnel.

[0030] Embodiment 2:

[0031] The difference between this embodiment and Embodiment 1 is as follows. Please refer to Figure 3 , which includes an electrical conductor 1 and a first insulating layer 201 coated on the outside of the electrical conductor 1. The electrical conductor 1 and the first insulating layer 201 together form an insulating core. A plurality of insulating cores are jointly coated with a first shielding layer 301 on the outside, and a second insulating layer 202, a second shielding layer 302, a flame-retardant layer 4, and a third insulating layer 203 are coaxially coated on the outside of the first shielding layer 301 in sequence from the inside to the outside. The materials of the first shielding layer 301 and the second shielding layer 302 are copper and iron respectively, used to resist electromagnetic interference of different frequency interference spectra.

[0032] In this embodiment, multiple strands of insulating cores are arranged inside the second insulating layer 202, the second shielding layer 302, the flame-retardant layer 4, and the third insulating layer 203. Each strand of insulating core also adopts the structure of the first insulating layer 201 coating the electrical conductor 1, which can ensure the high strength, high-temperature resistance to flame, and electromagnetic shielding characteristics of the multiple strands of electrical conductors 1.

[0033] The above-described embodiments are only used to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A radio frequency cable for high temperature resistance and flame retardance, comprising an electrical conductor, and a multi-stage insulating layer coaxially coated outside the electrical conductor, and one of the insulating layers is arranged on the outermost layer, characterized in that, At least one level of shielding layer is provided at intervals between multiple levels of the insulating layer, and a flame retardant layer is provided at least on the inner side close to the outermost insulating layer; the insulating layer sequentially includes a first insulating layer, a second insulating layer, and a third insulating layer from the inside to the outside. The first insulating layer tightly wraps around the outside of the electrical conductor, and the third insulating layer is provided on the outermost layer; a first shielding layer and a second shielding layer are respectively provided on the inner wall and the outer wall close to the second insulating layer, and the first shielding layer and the second shielding layer are used to resist electromagnetic interference of different frequency interference spectrums.

2. The radio frequency cable for high temperature resistance and flame retardance according to claim 1, characterized in that, The flame retardant layer is provided between the second shielding layer and the third insulating layer, and the flame retardant layer is woven or wound with a halogen-free fiberglass tape with a thickness of 0.2 mm.

3. The radio frequency cable for high temperature resistance and flame retardance according to claim 1, characterized in that, The material of the first shielding layer is copper, and the material of the second shielding layer is iron.

4. A radio frequency cable for high temperature resistance and flame retardance according to claim 3, characterized in that, The first shielding layer is formed by twisting a woven copper mesh or curling a perforated thin copper sheet; the second shielding layer is formed by twisting a woven iron mesh or curling a thin iron sheet.

5. A radio frequency cable for high temperature resistance and flame retardancy according to any one of claims 1-4, characterized in that The insulating layer is extruded with perfluoroethylene propylene or cross-linked polyethylene, and multiple levels of the insulating layer are made of the same or different materials.

6. A radio frequency cable for high temperature resistance and flame retardance, comprising an electrical conductor and a first insulating layer coated on the outside of the electrical conductor, wherein the electrical conductor and the first insulating layer together form an insulating core body, characterized in that, A first shielding layer is commonly coated on the outside of multiple insulating cores, and a second insulating layer, a second shielding layer, a flame retardant layer, and a third insulating layer are coaxially coated on the outside of the first shielding layer from the inside to the outside in sequence; the materials of the first shielding layer and the second shielding layer are copper and iron respectively, and are used to resist electromagnetic interference of different frequency interference spectrums.

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