Temperature-resistant radio frequency coaxial cable
By setting a heat insulation layer in the radio frequency coaxial cable and using fire-resistant fiberglass cloth tape or mica tape to block heat conduction, the heat resistance problem of the insulation layer in high-temperature environments is solved, ensuring the stable operation of the cable in high-temperature environments.
Patent Information
- Application Number
- CN202422907668.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing radio frequency coaxial cables have poor heat resistance of insulation layer in high-temperature environments, and are prone to point melting due to heat conduction, resulting in abnormal standing waves and faults.
A first heat insulation layer is provided between the inner conductor and the insulation layer of the radio frequency coaxial cable, a second heat insulation layer is provided between the insulation layer and the shielding layer, and a third heat insulation layer is provided between the shielding layer and the sheath layer. Fireproof fiberglass cloth or mica tape is used as the heat insulation material to block heat conduction.
It effectively protects the insulation layer, preventing deformation or melting caused by heat conduction, thus improving product reliability and safety and reducing standing wave anomalies and malfunctions.
Smart Images
Figure CN223552681U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wire and cable technology, and in particular to a temperature-resistant radio frequency coaxial cable. Background Technology
[0002] With the rapid development of communication technology, conventional radio frequency coaxial cables can no longer meet the needs of some special environments, such as high-temperature environments. The outer sheath material of radio frequency coaxial cables is generally low-smoke halogen-free flame-retardant polyolefin material, which can play a role in flame retardancy, fire resistance and heat insulation. However, the inner conductor and shielding layer are made of metal materials with good thermal conductivity such as copper, aluminum, and aluminum alloys, while the insulation layer is made of polyethylene material or foamed polyethylene polypropylene and other polyolefin materials, which do not have high temperature resistance and have poor high temperature resistance.
[0003] When the outer sheath is exposed to fire and heat for an extended period, the inner conductor and shielding layer may melt at points due to heat conduction, causing uneven dielectric distribution within the insulation layer. This can lead to quality issues such as abnormal standing waves and fault points in the product. Simply increasing the flame retardancy rating of the outer sheath is not an effective way to prevent external heat from being conducted into the internal metal conductor and shielding layer. Utility Model Content
[0004] The technical problem to be solved by this utility model is: in order to solve the technical problem that the insulation layer has poor high temperature resistance and may melt in a point-like manner when heated in the prior art, this utility model provides a high temperature resistant radio frequency coaxial cable. By improving the product structure of the radio frequency coaxial cable, heat transfer is prevented, the insulation layer is prevented from being heated and damaged, and the product quality is guaranteed to be safer and more reliable.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a temperature-resistant radio frequency coaxial cable, which includes: an inner conductor, an insulation layer, a shielding layer and a sheath layer arranged sequentially from the inside to the outside, wherein the inner conductor, the insulation layer, the shielding layer and the sheath layer are coaxially arranged;
[0006] A first heat insulation layer is provided between the inner conductor and the insulating layer;
[0007] A second heat insulation layer is provided between the insulating layer and the shielding layer.
[0008] The specific technical effect is as follows: by setting a first heat insulation layer inside the insulation layer and a second heat insulation layer outside the insulation layer, the heat conduction from the metal material of the inner conductor and shielding layer to the insulation layer is blocked, the impact of heat conduction on the insulation layer is reduced, the heat-sensitive insulation layer is effectively protected, and the polyolefin material of the insulation layer is prevented from causing abnormal standing waves or malfunctions due to heat deformation or point melting.
[0009] Furthermore, a third heat insulation layer is provided between the shielding layer and the sheath layer.
[0010] The specific technical effect is that by setting a third heat insulation layer between the shielding layer and the sheath layer, the heat conduction from the sheath layer to the shielding layer is blocked, thereby slowing down the rate at which the shielding layer conducts heat to the insulation layer.
[0011] Furthermore, the third heat insulation layer is a fire-resistant glass fiber cloth wrapped heat insulation layer or a mica tape heat insulation layer.
[0012] The specific technical effects are: the fire-resistant fiberglass cloth wrapped with the heat insulation layer has excellent fireproof and fire-resistant properties, and the mica tape heat insulation layer has electrical insulation and high temperature resistance properties.
[0013] Furthermore, the inner conductor, the first heat insulation layer, the insulating layer, the second heat insulation layer, the shielding layer, the third heat insulation layer, and the sheath layer are coaxially arranged.
[0014] Furthermore, both the first and second insulation layers are made of fire-resistant fiberglass cloth wrapped with insulation or mica tape insulation.
[0015] The specific technical effects are: the fire-resistant fiberglass cloth wrapped with the heat insulation layer has excellent fireproof and fire-resistant properties, and the mica tape heat insulation layer has electrical insulation and high temperature resistance properties.
[0016] Furthermore, the thickness of the first heat insulation layer, the second heat insulation layer, and the third heat insulation layer all range from 0.5 mm to 3.0 mm.
[0017] The specific technical effect is that the thicker the insulation layer, the better the insulation performance.
[0018] Furthermore, the sheath layer is a high flame-retardant, low-smoke, halogen-free flame-retardant sheath layer with an oxygen index greater than 35%.
[0019] The specific technical effect is that the oxygen index is an important indicator for measuring the combustion performance of materials. Generally speaking, the higher the oxygen index, the more difficult the material is to burn, and the better its flame retardant performance.
[0020] Furthermore, the outer periphery of the shielding layer is provided with multiple annular grooves, which are arranged in an axially spaced array, and the outer wall of the shielding layer is wavy.
[0021] The specific technical effect is that it increases the flexibility of cable products.
[0022] Compared with the prior art, the beneficial effects of this utility model are:
[0023] This utility model discloses a high-temperature resistant radio frequency coaxial cable. Each adjacent pair of the inner conductor, insulation layer, shielding layer, and sheath layer is insulated from heat conduction by fire-resistant and heat-resistant materials such as fire-resistant fiberglass cloth tape or mica tape. In particular, the first and second heat-insulating layers prevent heat from the metal materials of the inner conductor and shielding layer from being conducted to the polyolefin material of the insulation layer, reducing the impact of heat conduction on the insulation layer. This effectively protects the heat-sensitive insulation layer and prevents problems such as abnormal standing waves and malfunctions caused by heat deformation or point melting of the polyolefin material in the insulation layer, thus affecting the product's performance indicators. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] Figure 1 This is a schematic diagram of the radial cross-section structure of this utility model;
[0026] Figure 2 This is a schematic diagram of the axial explosion structure of this utility model.
[0027] In the diagram: 1. Inner conductor; 2. First heat insulation layer; 3. Insulation layer; 4. Second heat insulation layer; 5. Shielding layer; 6. Third heat insulation layer; 7. Sheath layer; 8. Annular groove. Detailed Implementation
[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] like Figures 1 to 2 The diagram shows the preferred embodiment of this utility model. This embodiment provides a temperature-resistant radio frequency coaxial cable, which includes: an inner conductor 1, an insulation layer 3, a shielding layer 5, and a sheath layer 7 sequentially arranged from the inside out. The inner conductor 1, insulation layer 3, shielding layer 5, and sheath layer 7 are coaxially arranged. A first heat insulation layer 2 is provided between the inner conductor 1 and the insulation layer 3. A second heat insulation layer 4 is provided between the insulation layer 3 and the shielding layer 5.
[0032] Therefore, by setting a first heat insulation layer 2 inside the insulation layer 3 and a second heat insulation layer 4 outside the insulation layer 3, the heat conduction from the metal material of the inner conductor 1 and the shielding layer 5 to the insulation layer 3 is blocked, the impact of heat conduction on the insulation layer 3 is reduced, the heat-sensitive insulation layer 3 is effectively protected, and the polyolefin material of the insulation layer 3 is prevented from deforming or melting due to heat, which could cause abnormal standing waves or malfunctions.
[0033] In this embodiment, a third heat insulation layer 6 is provided between the shielding layer 5 and the sheath layer 7.
[0034] Therefore, by wrapping the shielding layer 5 with the third heat insulation layer 6, the heat conduction from the sheath layer 7 to the shielding layer 5 is blocked, thereby slowing down the rate at which the shielding layer 5 conducts heat to the insulation layer 3.
[0035] In this embodiment, the inner conductor 1, the first heat insulation layer 2, the insulating layer 3, the second heat insulation layer 4, the shielding layer 5, the third heat insulation layer 6, and the sheath layer 7 are coaxially arranged.
[0036] In this embodiment, the first heat insulation layer 2 and the second heat insulation layer 4 are both fire-resistant glass fiber cloth wrapped with heat insulation layer or mica tape heat insulation layer, and the third heat insulation layer 6 is a fire-resistant glass fiber cloth wrapped with heat insulation layer or mica tape heat insulation layer.
[0037] Therefore, the fire-resistant fiberglass cloth wrapped with the heat insulation layer has excellent fireproof and fire-resistant properties, while the mica tape heat insulation layer has electrical insulation and high-temperature resistance properties.
[0038] Specifically, as an inorganic non-metallic material, fiberglass itself has excellent high-temperature resistance. When exposed to flames, it can effectively block the spread of fire, acting as an isolation point to buy time for protecting surrounding equipment and items. Its fire-resistant principle is that fiberglass itself is not easily combustible, and the treated fiberglass strips form a heat-insulating carbonized layer when heated, further hindering heat transfer and flame propagation. Fiberglass fireproof cloth has excellent heat insulation properties, effectively preventing the conduction and radiation of high-temperature heat sources. It also has good corrosion resistance, flexibility, and processability, and can be cut, sewn, and customized as needed to adapt to objects of different shapes and sizes.
[0039] Specifically, mica is a layered silicate mineral with a natural layered structure. This structure makes mica less prone to change at high temperatures, allowing it to be used normally in high-temperature environments. It can generally withstand temperatures of several hundred degrees Celsius, and for example, it can maintain its insulation and mechanical properties even at temperatures of 500°C or higher. It is suitable for insulation protection of motors, electrical appliances, and other equipment in high-temperature working environments, thus ensuring its good thermal insulation performance. It can also effectively block current and prevent leakage. In electrical equipment, it can ensure the safe and stable operation of electrical systems. It has high insulation resistance and strong breakdown voltage. Moreover, the SiO4 tetrahedra in the layered structure of mica can move freely along the plane of the layers. This movement gives the mica material excellent flexibility and plasticity to adapt to objects of different shapes and sizes. Therefore, it can be wrapped around the inner conductor 1 and the insulation layer 3. When exposed to open flame, there is basically no volatilization of harmful fumes. Therefore, it is not only effective but also very safe for use in cables and other applications.
[0040] In this embodiment, the thickness of the first heat insulation layer 2, the second heat insulation layer 4, and the third heat insulation layer 6 are all in the range of 0.5mm to 3.0mm.
[0041] Therefore, the thicker the insulation layer, the better the insulation performance, but the higher the price. Also, because the insulation layer is thicker, the total outer diameter of the cable is larger, making it inconvenient to install in small spaces. Therefore, considering factors such as insulation performance, cost, and application, the thickness of the insulation layer can be selected in the range of 0.5mm to 3.0mm.
[0042] In this embodiment, the sheath layer 7 is made of a high flame-retardant, low-smoke, halogen-free flame-retardant material with an oxygen index greater than 35%.
[0043] Therefore, the oxygen index is an important indicator for measuring the combustion performance of materials. Generally speaking, the higher the oxygen index, the more difficult the material is to burn and the better its flame retardant performance. When the oxygen index of a material is greater than 35%, it usually means that the material has excellent flame retardant properties. However, the better the fireproof, heat insulation and flame retardant performance, the higher the price. Therefore, materials with appropriate oxygen index content can be selected according to the actual application and cost.
[0044] In this embodiment, the outer periphery of the shielding layer 5 is provided with a plurality of annular grooves 8, which are arranged in an array at equal intervals along the axial direction, and the outer wall of the shielding layer 5 is wavy.
[0045] Therefore, by creating multiple annular grooves 8 in the axial direction, the outer wall of the shielding layer 5 forms a wave-like structure with peaks and troughs. This structure increases the flexibility of the cable product, reduces the bending radius of the product, and facilitates construction and installation in small spaces.
[0046] Compared with the prior art, the beneficial effects of this utility model are:
[0047] This utility model discloses a heat-resistant radio frequency coaxial cable. Between each adjacent pair of the inner conductor 1, insulation layer 3, shielding layer 5, and sheath layer 7, fire-resistant and heat-resistant materials such as fire-resistant fiberglass cloth tape or mica tape are used to isolate heat conduction between the layers. In particular, the first heat insulation layer 2 and the second heat insulation layer 4 prevent the heat from the metal materials of the inner conductor 1 and shielding layer 5 from being conducted to the polyolefin material of the insulation layer 3, reducing the impact of heat conduction on the insulation layer 3. This effectively protects the heat-sensitive insulation layer 3 and prevents problems such as abnormal standing waves or malfunctions caused by heat deformation or point melting of the polyolefin material of the insulation layer 3, thus affecting the product's performance indicators.
[0048] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.
Claims
1. A temperature-resistant radio frequency coaxial cable, characterized in that, include: An inner conductor (1), an insulating layer (3), a shielding layer (5), and a sheath layer (7) are sequentially arranged from the inside out, and the inner conductor (1), the insulating layer (3), the shielding layer (5), and the sheath layer (7) are coaxially arranged; A first heat insulation layer (2) is provided between the inner conductor (1) and the insulating layer (3); A second heat insulation layer (4) is provided between the insulating layer (3) and the shielding layer (5).
2. The temperature-resistant radio frequency coaxial cable as described in claim 1, characterized in that, The shielding layer (5) has multiple annular grooves (8) on its outer periphery. The multiple annular grooves (8) are arranged in an axially spaced array. The outer wall of the shielding layer (5) is wavy.
3. The temperature-resistant radio frequency coaxial cable as described in claim 1, characterized in that, A third heat insulation layer (6) is provided between the shielding layer (5) and the sheath layer (7).
4. The temperature-resistant radio frequency coaxial cable as described in claim 3, characterized in that, The third insulation layer (6) is a fireproof glass fiber cloth wrapped insulation layer or a mica tape insulation layer.
5. The temperature-resistant radio frequency coaxial cable as described in claim 3, characterized in that, The inner conductor (1), the first heat insulation layer (2), the insulation layer (3), the second heat insulation layer (4), the shielding layer (5), the third heat insulation layer (6), and the sheath layer (7) are coaxially arranged.
6. The temperature-resistant radio frequency coaxial cable as described in claim 3, characterized in that, The thicknesses of the first heat insulation layer (2), the second heat insulation layer (4), and the third heat insulation layer (6) are all in the range of 0.5 mm to 3.0 mm.
7. The temperature-resistant radio frequency coaxial cable as described in claim 1, characterized in that, The first heat insulation layer (2) and the second heat insulation layer (4) are both fireproof glass fiber cloth wrapped heat insulation layers or mica tape heat insulation layers.
8. The temperature-resistant radio frequency coaxial cable as described in claim 1, characterized in that, The sheath layer (7) is a high flame-retardant, low-smoke, halogen-free flame-retardant sheath layer with an oxygen index greater than 35%.