A cable with a double layer insulation sheath structure

Abstract

The utility model relates to a kind of cable of double-layer insulation sheath structure, it is related to cable production technical field, including metal conductor, first insulating layer, anti-adhesion layer, second insulating layer arranged in order from inside to outside, the anti-adhesion layer is used to prevent the first insulating layer and the second insulating layer adhesion, the thickness of the second insulating layer is greater than the first insulating layer, anti-adhesion layer is arranged between first insulating layer and second insulating layer, can effectively prevent the first insulating layer and second insulating layer from mutual extrusion and occur the situation of adhesion in production, transportation and use process, first insulating layer and second insulating layer can also avoid adhesion caused by cable service performance decline, improve the flexibility and wear resistance of cable, prolong the service life of cable, improve the overall service performance of cable.

Description

Technical Field

[0001] This utility model belongs to the field of cable manufacturing technology, and specifically relates to a cable with a double-layer insulation sheath structure. Background Technology

[0002] Electric wires and cables, as essential equipment for transmitting electrical energy and information, are widely used in industry, construction, and other fields. Traditional cable structures typically employ a single-layer insulation sheath, which has several shortcomings. A single-layer insulation sheath cannot simultaneously provide good insulation and protective performance. When used in harsh environments, the insulation layer is susceptible to erosion from environmental factors such as humidity and corrosive gases, leading to a decline in insulation performance and posing a risk of electric shock.

[0003] To address these issues, the industry has proposed several new cable structures, such as a double-insulated sheath design. The outer insulating sheath effectively prevents external environmental corrosion of the internal conductors, while also improving the cable's protective performance and preventing mechanical damage. The inner insulating sheath directly wraps around the metal conductor, providing excellent insulation and preventing short circuits between conductors. However, in existing double-insulated sheath structures, the two insulating layers are prone to sticking together during manufacturing, affecting the cable's performance.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to design cables with a double-insulated sheath structure to effectively prevent the first and second insulation layers from sticking together due to mutual compression during production, transportation and use, avoid the decline in cable performance caused by the adhesion of the first and second insulation layers, improve the flexibility and wear resistance of the cable, extend the service life of the cable, and improve the overall performance of the cable. These are technical problems that need to be solved by those skilled in the art. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a cable with a double-layer insulation sheath structure, effectively preventing the first and second insulation layers from sticking together due to mutual compression during production, transportation, and use. This avoids the performance degradation caused by the adhesion of the first and second insulation layers, improves the cable's flexibility and abrasion resistance, extends the service life of the cable, and enhances the overall performance of the cable.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A cable with a double-layer insulation sheath structure includes a metal conductor, a first insulation layer, an anti-adhesion layer, and a second insulation layer arranged sequentially from the inside to the outside. The anti-adhesion layer is used to prevent the first insulation layer and the second insulation layer from sticking together, and the thickness of the second insulation layer is greater than that of the first insulation layer.

[0008] Preferably, the anti-sticking layer is a mica powder layer.

[0009] Preferably, a shielding layer is also covered on the outside of the second insulating layer.

[0010] Preferably, an oxygen barrier layer that retards the cable is provided between the second insulation layer and the shielding layer.

[0011] Preferably, both the first insulating layer and the second insulating layer are low-smoke halogen-free polyethylene layers.

[0012] Preferably, the shielding layer comprises an aluminum-plastic composite strip layer and a tin-plated copper wire braided layer arranged sequentially from the inside out, wherein the braiding density of the tin-plated copper wire braided layer is not less than 90%.

[0013] Preferably, the metal conductor is made of copper wire.

[0014] Preferably, a conductive ink layer is extruded onto the outer surface of the second insulating layer, and the conductive ink layer is connected to the signal of the display alarm device.

[0015] Preferably, the thickness of the first insulating layer is 0.2 mm to 1.0 mm.

[0016] Preferably, the thickness of the second insulating layer is 1.0 mm to 2.0 mm.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] An anti-sticking layer is provided between the first insulation layer and the second insulation layer, which can effectively prevent the first insulation layer and the second insulation layer from sticking together due to mutual compression during production, transportation and use. It can also avoid the decline in cable performance caused by the first insulation layer and the second insulation layer sticking together, improve the flexibility and wear resistance of the cable, extend the service life of the cable and improve the overall performance of the cable. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Appendix Figure 1 This is a schematic diagram of the cross-sectional structure of a cable with a double-layer insulating sheath structure disclosed in the embodiments of this utility model.

[0021] The components are: 1. Metal conductor; 2. First insulating layer; 3. Anti-sticking layer; 4. Second insulating layer; 5. Oxygen barrier layer; 6. Shielding layer. Detailed Implementation

[0022] 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.

[0023] The purpose of this invention is to provide a cable with a double-layer insulation sheath structure, which effectively prevents the first insulation layer and the second insulation layer from sticking together due to mutual compression during production, transportation and use, avoids the decline in cable performance caused by the adhesion of the first insulation layer and the second insulation layer, improves the flexibility and wear resistance of the cable, extends the service life of the cable, and improves the overall performance of the cable.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] refer to Figure 1 The cable with a double-insulated sheath structure disclosed in this embodiment of the present invention includes at least a metal conductor 1, a first insulation layer 2, an anti-sticking layer 3, and a second insulation layer 4 arranged sequentially from the inside out. The thickness of the second insulation layer 4 is greater than that of the first insulation layer 2. By adopting a double-insulated sheath design, the second insulation layer 4 can effectively prevent external environmental factors such as moisture and corrosive gases from corroding the internal conductor, thereby improving the insulation performance of the cable and avoiding the risk of electric shock. The first insulation layer 2 directly wraps around the metal conductor 1, providing good insulation and preventing short circuits between conductors. Furthermore, the second insulation layer 4 has good protective properties. Yes, the thickness of the second insulation layer 4 is greater than that of the first insulation layer 2, which can effectively prevent the cable from being mechanically damaged by gravel, sharp objects, etc. during use, thereby extending the service life of the cable. An anti-adhesion layer 3 is provided between the first insulation layer 2 and the second insulation layer 4, which can effectively prevent the first insulation layer 2 and the second insulation layer 4 from sticking together due to mutual compression during production, transportation and use. It can also avoid the decline in cable performance caused by the first insulation layer 2 and the second insulation layer 4 sticking together, improve the flexibility and wear resistance of the cable, extend the service life of the cable and improve the overall performance of the cable.

[0026] refer to Figure 1In one implementation method, the anti-sticking layer is a mica powder layer. Mica powder can withstand high temperature environments of 500°C to 1200°C and can still maintain good physical and chemical stability under these extreme conditions. It will not cause adhesion failure due to softening or melting due to heat. Mica powder has a highly dissociated layered silicate structure with smooth sheet surfaces, high hardness and a large aspect ratio (up to 80-120 times). It forms a loose physical isolation layer between the first insulating layer 2 and the second insulating layer 4, effectively reducing the direct contact area between surfaces and making it difficult for the layers to adhere tightly under pressure, thereby significantly reducing the risk of adhesion.

[0027] Mica powder can help prevent sticking in some situations.

[0028] Mica powder has a flake-like structure, which can form a relatively smooth insulating layer on the surface of materials. Adding mica powder to some coatings, plastics, and rubber systems can reduce the direct contact area between materials, thereby reducing the possibility of adhesion. For example, coating certain plastic products with a mica powder-containing coating can prevent them from sticking together. However, its anti-adhesion effect is affected by various factors, such as the particle size of the mica powder, the amount added, and other components of the system. Furthermore, the degree of anti-adhesion varies depending on the application.

[0029] Adding mica powder between insulating layers also has the following effects:

[0030] 1. Enhanced insulation performance: Mica itself has good electrical insulation properties. Adding it can further improve the insulation capacity of the entire insulation structure and reduce the risk of leakage.

[0031] 2. Improve mechanical strength: It can enhance the bonding force between insulation layers, making the insulation structure more robust and less prone to damage, delamination or deformation due to external forces or other factors, thereby maintaining a good insulation state.

[0032] 3. Improved heat dissipation: It helps with heat conduction, enabling the insulation structure to dissipate heat more effectively during operation, and avoiding the impact of local overheating on insulation performance and service life.

[0033] 4. Moisture-proof: It can block moisture intrusion to a certain extent, protecting the insulation performance from the effects of moisture and extending the stable operating time of the insulation structure.

[0034] refer to Figure 1 In one implementation, the anti-sticking layer 3 can also be a talc layer with a thickness of 0.2 mm. When the cable is bent, the talc layer forms micron-level rolling friction, which can reduce the shear stress between the insulation layers. The dielectric constant of talc (ε≈2.1) forms a gradient dielectric structure, which can reduce the distributed capacitance by about 30% and significantly improve the phase stability of high-frequency signal transmission.

[0035] It should be noted that by combining the talc powder layer with 5% nano boron nitride and forming an oriented arrangement structure under a hot-pressing process at 150℃, the interlayer friction coefficient is reduced from 0.4 to 0.15.

[0036] refer to Figure 1 As one implementation method, a shielding layer 6 is also wrapped around the outside of the second insulation layer 4. The shielding layer 6 and the second insulation layer 4 are closely attached to form an equipotential interface, which makes the wire have better conductivity and can better meet the needs of electrical equipment.

[0037] refer to Figure 1 In one implementation, an oxygen barrier layer 5 for flame retardant cable is provided between the second insulation layer 4 and the shielding layer 6. The oxygen barrier layer 5 is made of low-smoke halogen-free flame retardant material (such as cross-linked polyethylene, ethylene-vinyl acetate copolymer, or polypropylene). Metal hydrate components (such as aluminum hydroxide or magnesium hydroxide) are added to the low-smoke halogen-free flame retardant material. When exposed to high temperature, it can decompose into metal oxides and precipitate water of crystallization. After the metal oxides decompose, they form a network structure, which has a certain adsorption effect on smoke. The precipitated water of crystallization not only has a significant settling effect on smoke particles, but also has a good heat absorption effect, delaying the combustion speed and time when the cable itself begins to burn. Due to the formation of the carbonized structure, the supply of oxygen and the flow of combustible gases are hindered, thus hindering the combustion of the cable and improving the flame retardant performance of the cable.

[0038] It should be noted that a water-blocking strip is set between the second insulation layer 4 and the oxygen barrier layer 5, and a molecular-level moisture barrier is formed by a spiral wrapping process.

[0039] The oxygen barrier layer 5 is 0.3 mm thick, and the added metal hydrate component is aluminum hydroxide, with a content of 10%.

[0040] refer to Figure 1 In one embodiment, both the first insulating layer 2 and the second insulating layer 4 are low-smoke halogen-free polyethylene layers.

[0041] refer to Figure 1 As one implementation method, the shielding layer 6 includes an aluminum-plastic composite strip layer and a tin-plated copper wire braid layer arranged sequentially from the inside to the outside, which provides better protection for the metal conductor 1 located in the center of the wire, and also avoids external electrical signal interference, so that the wire has better conductivity and can better meet the usage requirements of electrical equipment.

[0042] refer to Figure 1 As one implementation method, the braiding density of the tin-plated copper wire braid layer is not less than 90%, which further improves the anti-electrical signal interference effect of the metal conductor 1.

[0043] It should be noted that the aluminum-plastic composite strip layer is 0.1mm thick, and the braiding density of the tin-plated copper wire braid layer is 92%.

[0044] refer to Figure 1 In one implementation, the metal conductor 1 is made of multiple strands of copper wire. After the multiple strands of fine copper wire are twisted together, the stress can be dispersed by the slippage of a single wire when it is bent, which reduces the overall rigidity and makes it more resistant to repeated bending than a single solid conductor of the same cross-sectional area.

[0045] It should be noted that the cross-sectional area of ​​the metal conductor 1 is 1.5 square millimeters, and the two ends of the metal conductor 1 are provided with connectors for connecting adjacent cables.

[0046] refer to Figure 1 In one implementation, a conductive ink layer is extruded onto the outer surface of the second insulating layer 4. A distributed strain sensing network is formed by setting the conductive ink layer. The strain sensing network formed by the conductive ink layer is connected to the display and alarm device. The control system analyzes the data collected by the conductive ink layer. When the collected data exceeds the set strain threshold, the display and alarm device will display and alarm, which can monitor cable deformation in real time.

[0047] refer to Figure 1 In one embodiment, the thickness of the first insulating layer 2 is 0.2 mm to 1.0 mm, preferably 0.6 mm.

[0048] refer to Figure 1 In one embodiment, the thickness of the second insulating layer 4 is 1.0 mm to 2.0 mm, preferably 1.2 mm.

[0049] The manufacturing steps of this utility model are as follows:

[0050] Step 1: The insulating material is heated to its melting temperature, so that it is completely melted and uniformly mixed. Then the molten insulating material is uniformly covered on the outer surface of the metal conductor 1 to form the first insulating layer 2.

[0051] Step 2: Use rapid cooling equipment such as blowers, water cooling devices, and cooling boxes to accelerate the cooling of the newly formed first insulation layer 2, so that it can be quickly solidified and cured, thereby improving production efficiency and shortening the time of each production cycle.

[0052] Step 3: After the first insulating layer 2 has completely cooled and solidified, a layer of talc powder is evenly covered on its surface. This talc powder layer can prevent the second insulating layer 4 applied later from sticking to the first insulating layer 2. At the same time, talc powder has good thermal conductivity, which helps to accelerate the cooling rate of the first insulating layer 2.

[0053] Step 4: Reheat the insulating material to a molten state, so that it is completely melted and evenly mixed. Then, evenly cover the first insulating layer 2 and the talc powder layer on its surface with the melted insulating material to form the second insulating layer 4.

[0054] Step 5: Extrude a conductive ink layer on the outer surface of the second insulating layer 4 and lay out the circuit to connect with the display and alarm device. An oxygen barrier layer 5 and a shielding layer 6 are then sequentially set on the outside of the conductive ink layer.

[0055] In another embodiment, the first insulating layer 2 may be made of 0.5 mm thick cross-linked polyethylene (dielectric strength 30 kV / mm), the second insulating layer 4 may be made of 0.8 mm thick thermoplastic polyurethane (tear strength 18 N / mm), and the anti-stick layer 3 may be made of 0.05 mm thick fumed silica transition layer (thermal conductivity 0.12 W / m·K).

[0056] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0057] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered as exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A cable with a double-layer insulated sheath structure, characterized in that, It includes a metal conductor, a first insulating layer, an anti-sticking layer, and a second insulating layer arranged sequentially from the inside to the outside. The anti-sticking layer is used to prevent the first insulating layer and the second insulating layer from sticking together. The thickness of the second insulating layer is greater than that of the first insulating layer.

2. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, The anti-sticking layer is a mica powder layer.

3. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, A shielding layer is also wrapped around the outside of the second insulating layer.

4. The cable with a double-layer insulated sheath structure according to claim 3, characterized in that, An oxygen barrier layer that retards the cable is provided between the second insulation layer and the shielding layer.

5. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, Both the first insulating layer and the second insulating layer are low-smoke halogen-free polyethylene layers.

6. The cable with a double-layer insulated sheath structure according to claim 3, characterized in that, The shielding layer comprises an aluminum-plastic composite strip layer and a tin-plated copper wire braided layer arranged sequentially from the inside out, wherein the braiding density of the tin-plated copper wire braided layer is not less than 90%.

7. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, The metal conductor is made of braided copper wire.

8. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, A conductive ink layer is extruded onto the outer surface of the second insulating layer, and the conductive ink layer is connected to the signal of the display alarm device.

9. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, The thickness of the first insulating layer is 0.2 mm to 1.0 mm.

10. The cable with a double-layer insulated sheath structure according to claim 1, characterized in that, The thickness of the second insulating layer is 1.0 mm to 2.0 mm.

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