A multi-layer high temperature resistant shielded twisted pair cable

Abstract

The utility model discloses a kind of multilayer high-temperature-resistant protective non-shielded twisted pair cable, it is related to cable technical field, including twisted pair cable core, the outside of twisted pair cable core is sequentially wrapped with high-temperature-resistant wrapping layer, insulating layer, high-temperature-resistant protective layer and outer sheath, and high-temperature-resistant protective layer is made of ceramic fiber framework, silicone rubber main body composite.The kind of multilayer high-temperature-resistant protective non-shielded twisted pair cable is sequentially set by high-temperature-resistant wrapping layer, insulating layer, high-temperature-resistant protective layer, forms the multiple structure of high-temperature-resistant protection, even after extreme high temperature condition, this twisted pair cable still can have high-temperature-resistant protective effect to internal twisted pair cable core, avoid causing signal interference, leakage etc. And high-temperature-resistant protective layer is made of the synergic structure of ceramic fiber framework, silicone rubber main body composite, forms efficient heat shield, provides strong high-temperature-resistant protective effect for cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a multi-layer high-temperature resistant unshielded twisted-pair cable. Background Technology

[0002] Unshielded twisted pair cable is a copper cable without a metal shielding layer. Specifically, it is made by twisting two insulated copper wires together with a certain twist pitch. Through this unique structural design, electromagnetic interference during signal transmission can be effectively reduced, ensuring stable signal transmission. As an excellent information transmission medium, unshielded twisted pair cable has advantages such as low cost, convenient installation, strong compatibility, and stable performance.

[0003] Existing twisted-pair cables have a circular cross-section, making them prone to rotation during installation and affecting signal transmission stability. Furthermore, some twisted-pair cables have poor flame retardancy, resulting in short lifespans under high temperatures, such as sudden fires, failing to meet requirements. To overcome these shortcomings, existing technology (Chinese patent application number 202421872821.X, application date 2024-08-06) discloses a flame-retardant shielded twisted-pair flat cable. By setting a U-shaped separator frame and separator plates, the twisted-pair cores are separated into corresponding receiving slots and arranged in a straight line, effectively reducing crosstalk coupling between wire pairs and improving the cable's balance characteristics. Anti-slip protrusions on the separator plates reduce slippage of the twisted-pair cores within the cable, improving their stability and resulting in more stable signal transmission. A flame-retardant layer made of mica tape is added outside the first shielding layer, improving the cable's insulation performance, mechanical strength, and abrasion resistance. The mica tape also has excellent high-temperature resistance and flame-retardant properties, extending the cable's operating time at high temperatures and ensuring normal circuit operation.

[0004] However, the aforementioned twisted-pair cable only has a single layer of mica tape flame retardant layer for flame retardant protection. This single-layer structure is too thin and is prone to softening, deformation, aging, and cracking after being subjected to extreme high temperatures. The mechanical and insulation properties of the material deteriorate, gradually losing its high-temperature protection effect on the cable core. This leads to signal interference, leakage, and other problems, shortening the cable's lifespan. To address these issues, innovative design based on existing equipment is urgently needed. Therefore, we have proposed a multi-layer high-temperature resistant unshielded twisted-pair cable that can effectively solve these problems. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-layer high-temperature resistant unshielded twisted-pair cable to solve the problem mentioned in the background art that the twisted-pair cable only has a single layer of mica tape flame retardant layer for flame retardant protection. However, the single-layer structure is too thin and is prone to softening, deformation, aging, and cracking after being subjected to extreme high-temperature conditions. The mechanical and insulation properties of the material deteriorate, thus gradually losing the high-temperature protection effect on the cable core, which in turn causes signal interference, leakage and other problems, shortening the service life of the cable.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer high-temperature resistant unshielded twisted-pair cable, comprising a twisted-pair cable core, wherein the twisted-pair cable core is formed by twisting two copper wires together, and a high-temperature resistant wrapping layer and an insulation layer are sequentially wrapped around the outside of the twisted-pair cable core; a high-temperature resistant protective layer is fixedly sleeved on the outside of the insulation layer, and the high-temperature resistant protective layer is composed of a ceramic fiber skeleton and an organosilicon rubber body, wherein the ceramic fiber skeleton serves as the main heat insulation skeleton, and the organosilicon rubber body is pressed and filled into the gaps of the ceramic fiber skeleton; an outer sheath is also fixedly sleeved on the outside of the high-temperature resistant protective layer to provide physical impact protection for the cable exterior.

[0007] Preferably, the outer surface of the copper wires of the twisted pair cable core is plated with a tin layer, which has good oxidation resistance and corrosion resistance.

[0008] Preferably, the gap between the two copper wires of the twisted pair cable core is filled with a filler layer, and the filler layer is made of fiberglass rope.

[0009] Preferably, the high-temperature resistant wrapping layer is made of polyimide film, with a wrapping overlap rate of 30%-50% and a thickness of 0.05-0.1mm.

[0010] Preferably, the outer wall of the insulating layer is formed with convex strips distributed along the axial direction, and the inner wall of the silicone rubber body is formed with grooves that are adapted to engage with the convex strips.

[0011] Preferably, the insulating layer has axially distributed adaptation grooves inside, and the adaptation grooves are correspondingly located at the protrusions.

[0012] Preferably, the outer walls on both sides of the outer sheath are respectively formed with matching snap-fit ​​blocks and snap-fit ​​seats, and the snap-fit ​​blocks and snap-fit ​​seats correspond one to one and are arranged horizontally.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This multi-layer high temperature resistant unshielded twisted pair cable forms a multi-layer high temperature resistant protection structure by sequentially setting a high temperature resistant wrapping layer, an insulation layer and a high temperature resistant protective layer. Even after extreme high temperature conditions, this twisted pair cable can still maintain the high temperature resistant protection effect on the internal twisted pair cable core, avoid signal interference, leakage and other problems, thereby extending the service life of the cable; and the high temperature resistant protective layer forms an efficient heat insulation barrier through the synergistic structure of ceramic fiber skeleton and organic silicone rubber body composite, providing a strong high temperature resistant protection effect for the cable. The specific contents are as follows: (1) By setting a high temperature resistant wrapping layer, which uses polyimide film, the material itself has excellent high temperature resistance performance. After wrapping, it can further enhance the insulation performance and high temperature resistance performance of the cable, prevent internal signal interference of the cable, and the wrapping thickness is relatively thin, without increasing the overall diameter and weight of the cable.

[0014] (2) By setting an insulation layer, which is made of high-temperature resistant irradiated cross-linked polyolefin material, the three-dimensional network structure of this material has a high melting point and thermal stability, which greatly enhances the high-temperature resistance of the material. Under high temperature, the cable can maintain good insulation performance and mechanical strength, effectively prevent leakage and short circuit between conductors, and ensure the safe and stable operation of twisted pair in high-temperature environment.

[0015] (3) By setting a high-temperature resistant protective layer, the ceramic fiber skeleton, as the main heat insulation skeleton, can withstand high temperature and block heat transfer. The silicone rubber body is pressed and filled in the gap of the ceramic fiber skeleton, which not only enhances the flexibility of the composite material, enabling it to adapt to the bending and stretching of the cable during installation and use, but also assists in heat insulation to a certain extent. The two work together to form an efficient heat insulation barrier, providing the cable with a strong high-temperature protection effect.

[0016] (4) The outermost outer sheath can provide physical impact protection for the cable. The combination of the clip block and clip seat facilitates the equidistant positioning and laying of adjacent cables, effectively reducing crosstalk coupling between cables and preventing relative slippage of cables during installation and use, thereby improving ease of use and stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the twisted pair cable core of this utility model; Figure 4 This is a schematic diagram of the high-temperature resistant wrapping layer and the insulating layer of this utility model; Figure 5 This is a schematic diagram of the high-temperature resistant protective layer of this utility model; Figure 6 This is a schematic diagram illustrating an example of how several sheaths of this utility model are fastened together.

[0018] In the diagram: 1. Twisted pair cable core; 2. Tin plating layer; 3. High-temperature resistant wrapping layer; 4. Filler layer; 5. Insulation layer; 6. Adaptation groove; 7. High-temperature resistant protective layer; 8. Ceramic fiber skeleton; 9. Silicone rubber body; 10. Outer sheath; 11. Clip block; 12. Clip seat. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figures 1-5 This utility model provides the following technical solution: a multi-layer high-temperature resistant unshielded twisted-pair cable, including a twisted-pair cable core 1, which is made of two copper wires twisted together. The outer surface of the copper wires of the twisted-pair cable core 1 is plated with a tin-plated layer 2. This tin layer has good oxidation resistance and corrosion resistance. Under high-temperature environment, it can still effectively prevent oxygen from contacting the internal copper wires, slow down the oxidation process of copper, so as to maintain the good conductivity of the twisted-pair cable core 1 and thus ensure the stable transmission of signals.

[0021] Furthermore, the gap between the two copper wires of the twisted pair cable core 1 is filled with a filling layer 4, which is made of fiberglass rope. This material has the characteristics of high temperature resistance, light weight and high strength. It can effectively fill the gap between the copper wires, making the cable structure more stable. At the same time, it can also play a certain role in heat insulation and reduce the impact of external high temperature on the inside of the twisted pair cable core 1.

[0022] The outside of the twisted pair cable core 1 is wrapped with a high-temperature resistant wrapping layer 3 and an insulation layer 5 in sequence. A high-temperature resistant protective layer 7 is fixedly sleeved on the outside of the insulation layer 5. The high-temperature resistant protective layer 7 is composed of a ceramic fiber skeleton 8 and an organosilicon rubber body 9. The ceramic fiber skeleton 8 serves as the main heat insulation skeleton, and the organosilicon rubber body 9 is pressed and filled into the gaps of the ceramic fiber skeleton 8.

[0023] Specifically, ceramic fiber is a high-performance inorganic fiber material with excellent high-temperature resistance. Its internal microstructure gives it an extremely low thermal conductivity, effectively preventing heat conduction and providing excellent thermal insulation. Silicone rubber, on the other hand, possesses unique flexibility and resistance to high and low temperatures, maintaining good elasticity and stability within a temperature range of -50℃ to 200℃. Combining ceramic fiber and silicone rubber, the ceramic fiber acts as the primary thermal insulation skeleton, capable of withstanding high temperatures and blocking heat transfer. The silicone rubber fills the gaps between the ceramic fibers, enhancing the composite material's flexibility to accommodate bending and stretching during cable installation and use. Furthermore, the silicone rubber also contributes to thermal insulation to some extent. Together, they form a highly efficient thermal barrier, providing robust high-temperature protection for the cable.

[0024] In summary, by sequentially layering the high-temperature resistant wrapping layer 3, the insulation layer 5, and the high-temperature resistant protective layer 7, a multi-layered high-temperature protection structure is formed. Even under extreme high-temperature conditions, this twisted pair cable can still maintain the high-temperature protection effect on the internal twisted pair cable core 1, avoiding problems such as signal interference and leakage, thereby extending the service life of the cable.

[0025] Example 2: Based on Example 1, please refer to... Figure 2 , Figures 4-5 The high-temperature resistant wrapping layer 3 is made of polyimide film with a wrapping overlap rate of 30%-50% and a thickness of 0.05-0.1mm. The polyimide film material itself can withstand temperatures up to 280℃. After wrapping, it can further enhance the insulation and high-temperature resistance of the cable, prevent internal signal interference, and the wrapping thickness is relatively thin, so it will not increase the overall diameter and weight of the cable.

[0026] Insulation layer 5 is made of high-temperature resistant irradiated cross-linked polyolefin material. This material is produced by irradiating polyolefin material with high-energy rays (such as electron beams, gamma rays, etc.) to cause cross-linking reactions between polyolefin molecular chains, forming a three-dimensional network structure. Compared with traditional insulation materials such as polyvinyl chloride and polyethylene, this special structure has a higher melting point and thermal stability, which greatly enhances the material's high-temperature resistance. At high temperatures, the cable can maintain good insulation performance and mechanical strength, effectively preventing leakage and short circuits between conductors, and ensuring the safe and stable operation of the twisted pair in high-temperature environments.

[0027] Furthermore, the outer wall of the insulation layer 5 is formed with axially distributed protrusions, and the inner wall of the silicone rubber body 9 is formed with grooves that fit and engage with the protrusions. Through the engagement structure of the protrusions and the grooves, the axial positioning of the insulation layer 5 and the high-temperature protective layer 7 can be achieved, thereby enhancing the connection strength and stability of the two and ensuring the structural stability of the entire cable.

[0028] In addition, the interior of the insulation layer 5 is provided with axially distributed adaptation grooves 6, and the adaptation grooves 6 are correspondingly located at the protrusions. The opening of the adaptation grooves 6 provides space for the insulation layer 5 to deform and expand, thereby further improving the flexibility of the cable when bending. The adaptation grooves 6 are correspondingly distributed at the thicker protrusions, which can minimize the impact of uneven wall thickness distribution of the insulation layer 5 on its structural strength.

[0029] Example 3: Based on Example 2, please refer to... Figure 6 The high-temperature resistant protective layer 7 is also fixedly sleeved with an outer sheath 10, which provides physical impact protection for the cable exterior. The outer sheath 10 is made of high-temperature resistant modified cross-linked polyolefin, which can withstand temperatures of 150℃-200℃. This material can prevent the outer sheath 10 from softening, sticking, or releasing harmful substances at high temperatures, thus affecting the stability of the internal protective layers and the twisted pair cable core 1.

[0030] Furthermore, the outer walls on both sides of the outer sheath 10 are respectively formed with matching snap-fit ​​blocks 11 and snap-fit ​​seats 12, and the snap-fit ​​blocks 11 and snap-fit ​​seats 12 correspond one to one and are arranged horizontally. Through the cooperation of snap-fit ​​blocks 11 and snap-fit ​​seats 12, it is convenient to lay adjacent cables at equal distances, effectively reducing crosstalk coupling between cables, and preventing relative slippage of cables during installation and use, thereby improving the convenience and stability of use.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layer high-temperature resistant unshielded twisted-pair cable, comprising a twisted-pair cable core (1), wherein the twisted-pair cable core (1) is formed by twisting two copper wires together; Its features are: The outside of the twisted pair cable core (1) is wrapped with a high-temperature resistant wrapping layer (3) and an insulation layer (5) in sequence. The outer side of the insulation layer (5) is fixedly fitted with a high-temperature resistant protective layer (7), and the high-temperature resistant protective layer (7) is composed of a ceramic fiber skeleton (8) and an organosilicon rubber body (9). The ceramic fiber skeleton (8) serves as the main heat insulation skeleton, and the organosilicon rubber body (9) is pressed and filled into the gaps of the ceramic fiber skeleton (8). The high-temperature resistant protective layer (7) is also fixedly fitted with an outer sheath (10) to provide physical impact protection for the cable.

2. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 1, characterized in that: The outer surface of the copper wire of the twisted pair cable core (1) is plated with a tin plating layer (2), which has good oxidation resistance and corrosion resistance.

3. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 2, characterized in that: The twisted pair cable core (1) has a filling layer (4) at the gap between the two copper wires, and the filling layer (4) is made of glass fiber rope.

4. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 1, characterized in that: The high-temperature resistant wrapping layer (3) is made of polyimide film with a wrapping overlap rate of 30%-50% and a thickness of 0.05-0.1mm.

5. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 1, characterized in that: The outer wall of the insulating layer (5) is formed with convex strips distributed along the axial direction, and the inner wall of the silicone rubber body (9) is formed with grooves that are adapted to engage with the convex strips.

6. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 5, characterized in that: The insulating layer (5) has an axially distributed adaptation groove (6) inside, and the adaptation groove (6) is correspondingly located at the protrusion.

7. The multi-layer high-temperature resistant unshielded twisted-pair cable according to claim 1, characterized in that: The outer walls on both sides of the outer sheath (10) are respectively formed with matching snap-fit ​​blocks (11) and snap-fit ​​seats (12), and the snap-fit ​​blocks (11) and snap-fit ​​seats (12) correspond one to one and are arranged horizontally.

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