A deformation-resistant low-voltage power cable

Abstract

This utility model relates to a deformation-resistant low-voltage power cable, comprising a cable sheath, inside which are distributed a plurality of cable cores arranged circumferentially around its rotation center, each cable core being coaxially covered with an insulation layer; characterized in that: between the cable sheath and the cable cores, from the inside out, a fireproof layer, a deformation-resistant layer, a buffer layer, and a flame-retardant layer are sequentially provided; the deformation-resistant layer has a spiral structure made of high-strength alloy material, with a plurality of supporting ribs evenly distributed around its center, and the spiral structure and the supporting ribs are an integral structure; the buffer layer is located outside the deformation-resistant layer, made of elastic rubber material, with a plurality of elastic protrusions evenly distributed on its outer side, the elastic protrusions contacting the flame-retardant layer. The spiral structure of the deformation-resistant layer, combined with the supporting ribs, improves the compressive strength and reduces weight. The annular elastic protrusions of the elastic buffer layer improve the buffering efficiency and can resist high-frequency vibration.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a deformation-resistant low-voltage power cable. Background Technology

[0002] Low-voltage power cables are mainly used to transmit electricity or signal current and voltage, and are widely used in production and daily life. Traditional low-voltage cables are susceptible to structural deformation during laying or operation due to external forces such as compression, tension, or impact. For example, some existing cables use a metal armor layer to enhance their resistance to deformation, but the metal layer is heavy, lacks flexibility, and generates induced voltage and eddy current losses under alternating current, affecting its current-carrying capacity. Furthermore, ordinary rubber buffer layers only provide limited elastic support; when the external force exceeds the material's elastic limit, buffer failure causes the internal core to directly bear stress, leading to breakage or insulation damage. This seriously affects normal use and can even cause leakage and other hazards to personal safety. Therefore, a low-voltage power cable resistant to compression and deformation is needed to solve these problems.

[0003] Therefore, it is necessary to develop a deformation-resistant low-voltage power cable to address the aforementioned defects. Utility Model Content

[0004] The purpose of this invention is to provide a deformation-resistant low-voltage power cable. The spiral structure of the deformation-resistant layer, combined with supporting ribs, improves compressive strength and reduces weight. The annular elastic protrusions of the elastic buffer layer enhance buffering efficiency and can resist high-frequency vibration.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model discloses a deformation-resistant low-voltage power cable, comprising a cable sheath, inside which are distributed a plurality of cable cores arranged circumferentially around its rotation center, and each cable core is coaxially covered with an insulation layer; characterized in that: between the cable sheath and the cable cores, a fireproof layer, a deformation-resistant layer, a buffer layer, and a flame-retardant layer are sequentially provided from the inside to the outside; the deformation-resistant layer has a spiral structure made of high-strength alloy material, and a plurality of supporting ribs are evenly distributed around its center, and the spiral structure and the supporting ribs are an integral structure; the buffer layer is located outside the deformation-resistant layer, is made of elastic rubber material, and a plurality of elastic protrusions are evenly distributed on its outer side, and the elastic protrusions are in contact with the flame-retardant layer.

[0007] Preferably, the fireproof layer is wrapped around the outer layer of the insulation layer of the cable core, and several cable cores are wrapped together as one unit.

[0008] Preferably, a protective layer is provided between the anti-deformation layer and the buffer layer. The protective layer is an aramid yarn braided layer. The protective layer is wrapped around the outside of the anti-deformation layer. The inner side of the protective layer abuts against the outer circumferential surface of the anti-deformation layer, and the outer side is attached to the inner side of the buffer layer. The two sides of the protective layer are fixedly connected to the anti-deformation layer and the buffer layer respectively by adhesive.

[0009] Preferably, the elastic protrusions are annular structures and are distributed axially at intervals on the outer side of the buffer layer.

[0010] Preferably, several support ribs are evenly distributed along the radial direction of the spiral structure, and the support ribs divide the spiral structure into several regions.

[0011] Preferably, the flame-retardant layer is disposed on the inner side of the cable sheath and is made of a high-efficiency flame-retardant material, with the inner side of the flame-retardant layer tightly covering the outer side of the buffer layer.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] This utility model relates to an anti-deformation low-voltage power cable. The anti-deformation layer is made of a high-strength alloy material with a spiral structure, combined with radially evenly distributed support ribs to form a multi-region stress dispersion system. The spiral structure converts external extrusion and tensile forces into spiral deformation energy, while the support ribs further transmit stress to the entire circumference, significantly reducing local stress concentration. The buffer layer is made of elastic rubber material, with annular elastic protrusions on the outer side spaced axially, forming multi-point elastic contact with the flame-retardant layer. When impacted, the elastic protrusions absorb energy through deformation, increasing the buffering efficiency by 40% compared to ordinary rubber layers. This effectively resists high-frequency vibrations or instantaneous impacts, preventing the internal core from breaking due to rigid stress. An aramid braided protective layer lies between the anti-deformation layer and the buffer layer. Its high strength enhances the overall tensile strength, while adhesive bonding forms a "rigid-flexible" protective system. This structure allows the cable to maintain structural stability even when the bending radius is five times its diameter, solving the problem of traditional cables easily cracking when bent. A fireproof layer and a flame-retardant layer are included, enhancing fire resistance and flame retardancy, and improving the safety factor. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the main structure of the deformation-resistant low-voltage power cable of this utility model;

[0016] Figure 2 This is a schematic diagram of the deformation-resistant layer structure;

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the buffer layer.

[0018] Explanation of reference numerals in the attached drawings: 1. Cable sheath; 2. Cable core; 3. Insulation layer; 4. Fireproof layer; 5. Deformation-resistant layer; 501. Spiral structure; 502. Supporting rib; 6. Buffer layer; 601. Elastic protrusion; 7. Flame-retardant layer; 8. Protective layer. Detailed Implementation

[0019] The core of this invention is to provide a deformation-resistant low-voltage power cable. The spiral structure of the deformation-resistant layer, combined with supporting ribs, improves compressive strength and reduces weight. The annular elastic protrusions of the elastic buffer layer enhance buffering efficiency and can resist high-frequency vibration.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. 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.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0022] Refer to the attached diagram. Figure 1 This is a schematic diagram of the main structure of the deformation-resistant low-voltage power cable of this utility model; Figure 2 This is a schematic diagram of the deformation-resistant layer structure; Figure 3 This is a schematic diagram of the cross-sectional structure of the buffer layer.

[0023] In one specific implementation, such as Figures 1-3 As shown, a deformation-resistant low-voltage power cable includes a cable sheath made of high-strength, corrosion-resistant polyvinyl chloride (PVC) material, possessing excellent resistance to ultraviolet radiation, aging, and acid and alkali corrosion. The cable sheath has a certain degree of flexibility and structural strength, maintaining its integrity even when the bending radius is ≥5 times the cable diameter, facilitating installation and effectively resisting external mechanical damage. Inside the cable sheath are several cable cores distributed circumferentially around the center of rotation of the cable sheath. Each cable core is coaxially wrapped with an insulation layer. The insulation layer is made of high-density polyethylene material, which has excellent electrical insulation properties, effectively isolating the cores and preventing leakage and short circuits.

[0024] In one specific implementation, such as Figures 1-3As shown, between the cable sheath and the cable core, there are also fireproof layers, deformation-resistant layers, buffer layers, and flame-retardant layers, which are wrapped from the inside out. The fireproof layer wraps around the insulation layer of the cable core and encloses several groups of cable cores as a whole. The fireproof layer is made of expanded vermiculite and magnesium hydroxide composite inorganic material. This material begins to expand above 200°C, forming a dense heat-insulating layer that can prevent flames and high temperatures from spreading to the core.

[0025] In one specific implementation, such as Figures 1-3 As shown, the deformation-resistant layer has a spiral structure made of polyamide-based alloy. The spiral pitch is 1 / 3 to 1 / 2 of the cable diameter, with 4 to 6 supporting ribs evenly distributed radially. The spiral structure and supporting ribs are injection molded into a single unit. The supporting ribs are distributed perpendicularly to the spiral structure, dividing it into several regions and forming a multi-directional stress dispersion system. When the cable is subjected to external forces, each region deforms synergistically, effectively dispersing the external forces and significantly resisting deformation caused by external forces, thus ensuring the stability of the cable structure. The combination of the spiral structure and supporting ribs provides support, and each region has a hollow structure, reducing the weight by more than 30% compared to traditional metal armor layers, and the bending radius can be reduced to 5 times its own diameter.

[0026] In one specific implementation, such as Figures 1-3 As shown, a protective layer, made of aramid braided yarn, is positioned between the anti-deformation layer and the buffer layer. The protective layer wraps around the outside of the anti-deformation layer, with its inner side abutting against the outer circumferential surface of the anti-deformation layer and its outer side adhering to the inner side of the buffer layer. Both sides of the protective layer are fixedly connected to the anti-deformation layer and the buffer layer respectively using adhesives to prevent interlayer slippage. The high-density braided structure gives the protective layer extremely high strength and abrasion resistance. Under normal cable use and under specified external forces, the protective layer does not separate from the anti-deformation layer or the buffer layer, ensuring that the protective layer can continuously protect the anti-deformation layer and enhance the overall strength and abrasion resistance of the cable.

[0027] In one specific implementation, such as Figures 1-3 As shown, the buffer layer is located outside the anti-deformation layer. The buffer layer is made of elastic rubber material and has several elastic protrusions evenly distributed inside, which contact the flame-retardant layer. The elastic protrusions are hemispherical in shape and are distributed axially at intervals on the outer side of the buffer layer. When the cable is subjected to compression or impact, the elastic protrusions absorb and disperse energy through their own elastic deformation, effectively buffering the cable and protecting its internal structure from damage. The buffer layer's buffering efficiency is 40% higher than that of ordinary rubber layers, and in high-frequency vibration environments, it can reduce the core vibration amplitude to ≤0.5mm.

[0028] In one specific implementation, such as Figures 1-3As shown, the flame-retardant layer is made of high-efficiency flame-retardant material. During combustion, it forms a dense char layer, preventing the transfer of oxygen and heat, effectively inhibiting the spread of flames on the cable surface, further improving the cable's flame-retardant performance, and reducing the risk of fire occurrence and spread. The flame-retardant layer tightly covers the outside of the buffer layer.

[0029] This utility model relates to an anti-deformation low-voltage power cable. In use, the cable can adapt to bending radii ≥ 5 times its own diameter. The spiral structure of the anti-deformation layer and the supporting ribs work together to disperse bending stress, preventing pressure on the conductor. The aramid braided layer of the protective layer enhances the overall tensile strength, allowing a maximum traction force of 10 times the cable's own weight, facilitating long-distance dragging and laying. When crossing gravel or rough ground, the cable sheath can resist scratches. When subjected to external pressure, the spiral structure of the anti-deformation layer converts the compressive force into spiral deformation energy, and the supporting ribs disperse the stress throughout the circumference. Simultaneously, the elastic protrusions of the buffer layer further absorb energy through compression deformation, increasing the buffering efficiency by 40% compared to ordinary rubber layers, preventing direct stress on the conductor. In high-frequency vibration environments, the annular elastic protrusions of the buffer layer can offset vibration energy through elastic deformation, ensuring the conductor vibration amplitude is ≤ 0.5mm, guaranteeing the stability of the insulation layer. When exposed to open flame, the flame-retardant layer first forms a carbonized layer to prevent the spread of flame, and the fireproof layer insulates against high temperatures through heat absorption and expansion, keeping the conductor temperature ≤ 100℃, buying time for emergency power outages. In the event of localized damage, the composite structure of the cable sheath and flame-retardant layer can temporarily prevent moisture intrusion, and together with the HDPE material of the insulation layer, it reduces the risk of short-term leakage.

[0030] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0031] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A deformation-resistant low-voltage power cable, comprising a cable sheath (1), wherein a plurality of cable cores (2) are distributed circumferentially around its rotation center inside the cable sheath (1), and each cable core (2) is coaxially covered with an insulation layer (3); characterized in that: Between the cable sheath (1) and the cable core (2), a fireproof layer (4), an anti-deformation layer (5), a buffer layer (6) and a flame-retardant layer (7) are arranged sequentially from the inside to the outside. The anti-deformation layer (5) is a spiral structure (501). The spiral structure (501) is made of high-strength alloy material, and several supporting ribs (502) are evenly distributed around the center of the spiral structure (501). The spiral structure (501) and the supporting ribs (502) are an integral structure. The buffer layer (6) is located on the outer layer of the anti-deformation layer (5). It is made of elastic rubber material, and several elastic protrusions (601) are evenly distributed on its outer side. The elastic protrusions (601) are in contact with the flame-retardant layer (7).

2. The deformation-resistant low-voltage power cable according to claim 1, characterized in that: The fireproof layer (4) is wrapped around the outer layer of the insulation layer (3) of the cable core (2), and wraps several cable cores (2) together.

3. The deformation-resistant low-voltage power cable according to claim 1, characterized in that: A protective layer (8) is provided between the anti-deformation layer (5) and the buffer layer (6). The protective layer (8) is an aramid filament braided layer. The protective layer (8) is wrapped around the outside of the anti-deformation layer (5). The inside of the protective layer (8) abuts against the outer circumferential surface of the anti-deformation layer (5), and the outside is attached to the inside of the buffer layer (6). The two sides of the protective layer (8) are fixedly connected to the anti-deformation layer (5) and the buffer layer (6) respectively by adhesive.

4. The deformation-resistant low-voltage power cable according to claim 1, characterized in that: The elastic protrusions (601) are annular structures and are distributed axially at intervals on the outside of the buffer layer (6).

5. The deformation-resistant low-voltage power cable according to claim 1, characterized in that: Several support ribs (502) are evenly distributed along the radial direction of the spiral structure (501), and the support ribs (502) divide the spiral structure (501) into several regions.

6. The deformation-resistant low-voltage power cable according to claim 1, characterized in that: The flame-retardant layer (7) is located inside the cable sheath (1) and is made of high-efficiency flame-retardant material. The inside of the flame-retardant layer (7) is tightly wrapped around the outside of the buffer layer (6).

Images