Aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable

Abstract

The utility model discloses an aluminum core low smoke zero halogen flame retardant medium voltage fire-resistant cable, relates to the fire-resistant cable technology field, and comprises an outer sheath, a first cable main body and a second cable main body, the outer part of an insulating layer is fixedly connected with a flame retardant layer, the outer part of the flame retardant layer is provided with air holes, the inner side of an opening is fixedly provided with a blocking net, and the inner side of the opening is provided with an outer sheath. The inner side of the outer sheath is fixedly connected with a sponge layer, the inner side of the sponge layer is fixedly connected with a waterproof sleeve, the outermost layer of the filling layer is wrapped with a thermoplastic polyurethane layer, the innermost layer of the outer sheath is arranged to be a thermoplastic polyolefin layer, and a heat-resistant fireproof mechanism is installed between the thermoplastic polyurethane layer and the thermoplastic polyolefin layer. According to the utility model, the dual mechanisms of efficient heat dissipation and natural cooling are realized through the multi-layer structure design, the fire risk caused by too high internal temperature is effectively avoided, in addition, the multi-layer composite outer sheath provides comprehensive protection and performance improvement, stable operation of the cable under various extreme conditions is ensured, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire -resistant cable technical field, specifically, relate to a kind of aluminium core low smoke halogen-free flame retardant medium voltage fire -resistant cable. BACKGROUND

[0002] With the rapid development of electric power industry, as the key component in power transmission and distribution system, the performance and safety of medium voltage fire -resistant cable are increasingly valued. Although traditional aluminium core cable has good conductivity and lighter weight, under long-term high load operation, the temperature inside the cable is easy to rise due to heat generated by current passing through, and if there is no effective heat dissipation mechanism, not only the transmission efficiency of the cable will be reduced, but also fire risk may be caused, especially in the case of environment airtight or poor heat dissipation condition. In addition, for the cable used outdoors, it also needs to consider the challenges of rain erosion, mechanical wear and extreme temperature changes.

[0003] Most of the fire -resistant cables on the market currently increase the thickness of the insulation layer or change the material formula to improve the flame retardant performance, but these methods often sacrifice the heat dissipation efficiency and flexibility of the cable, and have limited adaptability to outdoor environment, especially in the rain environment, the waterproof measures of traditional cable mostly rely on dry sealing structure, which can effectively block the intrusion of moisture, but often ignores the natural cooling effect of rain on the surface temperature of the cable, and also lacks effective heat dissipation strategies for long-term high temperature environment, therefore, in view of the above technical problems, an aluminium core low smoke halogen-free flame retardant medium voltage fire -resistant cable is proposed. SUMMARY

[0004] The utility model aims at providing an aluminium core low smoke halogen-free flame retardant medium voltage fire -resistant cable, which realizes the dual mechanism of efficient heat dissipation and natural cooling through multi-layer structure design, effectively avoids the fire risk caused by high internal temperature, and besides, the multi-layer composite outer sheath provides comprehensive protection and performance improvement, ensuring stable operation of the cable under various extreme conditions and prolonging the service life.

[0005] The utility model realizes the following technical scheme:

[0006] An aluminium core low smoke halogen-free flame retardant medium voltage fire -resistant cable, comprising an outer sheath, a first cable body and a second cable body, the first cable body and the second cable body are installed inside the outer sheath, and the number of the first cable body is two groups and is symmetrically arranged around the second cable body.

[0007] The first cable body and the second cable body are fixedly connected with an insulating layer, the insulating layer is fixedly connected with a flame-retardant layer, the flame-retardant layer is provided with air holes, the outer sheath is provided with an opening, the opening is fixedly installed with a barrier net, the outer sheath is fixedly connected with a sponge layer, the sponge layer is fixedly connected with a waterproof sleeve, the waterproof sleeve is filled with a filling layer, the filling layer is filled with a porous ceramic material, the outermost layer of the filling layer is wrapped with a thermoplastic polyurethane layer, the innermost layer of the outer sheath is a thermoplastic polyolefin layer, and a heat-resistant fireproof mechanism is installed between the thermoplastic polyurethane layer and the thermoplastic polyolefin layer.

[0008] Preferably, the air holes are arranged in several groups in a ring shape.

[0009] Preferably, the openings are arranged in several groups in a ring shape.

[0010] Preferably, the barrier net is a meshed hollow structure made of metal material.

[0011] Preferably, the sponge layer is supported by a sponge material, and the waterproof sleeve is made of heat-conducting material.

[0012] Preferably, the thermoplastic polyolefin layer is fixedly connected with the sponge layer.

[0013] Preferably, the heat-resistant fireproof mechanism comprises a polyethylene fiber woven layer, a ceramicized silicone rubber layer and a cross-linked polyethylene layer, the polyethylene fiber woven layer is fixedly connected to the inner side of the thermoplastic polyurethane layer, the ceramicized silicone rubber layer is fixedly connected to the inner side of the polyethylene fiber woven layer, the cross-linked polyethylene layer is fixedly connected to the inner side of the ceramicized silicone rubber layer, and the cross-linked polyethylene layer is fixedly connected to the outer surface of the thermoplastic polyolefin layer.

[0014] The technical scheme of the utility model has at least the following beneficial effects:

[0015] The utility model provides a kind of aluminum core low smoke halogen-free flame-retardant medium voltage fire-resistant cable, pass through the flame-retardant layer being provided with a large number of breathable holes, simultaneously utilize filling layer as heat transfer medium, further promote the transfer of heat, and ensure that heat can be rapidly dissipated by waterproof cover, effectively avoid the fire risk caused by internal temperature being too high, and rainwater can enter sponge layer by blocking net, so that the whole sponge layer can keep wet state for a long time, to reduce the temperature of waterproof layer, realize the sustained cooling effect to cable inside, not only enhance the heat dissipation capacity of cable, but also ingeniously utilize natural resources, improve the environmental adaptability and operating safety of cable, besides, the outer sheath of cable adopts multilayer composite structure, and each layer material synergistically acts, respectively provides wear-resistant tear-resistant, fire-retardant low smoke non-toxic, high temperature electrical insulation, buffering corrosion prevention and multiple protection, ensure the stable operation of cable under various extreme conditions, prolong service life, while significantly improve the safety and reliability of cable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is overall structure schematic diagram of the utility model;

[0017] Figure 2 It is Figure 1 Enlarged view of A;

[0018] Figure 3 It is partial section view of outer sheath;

[0019] Figure: 1, outer sheath;2, first cable body;3, second cable body;4, insulating layer;5, flame-retardant layer;6, breathable hole;7, opening;8, blocking net;9, sponge layer;10, waterproof cover;11, filling layer;12, thermoplastic polyurethane layer;13, polyethylene fiber braided layer;14, ceramicized silicone rubber layer;15, crosslinked polyethylene layer;16, thermoplastic polyolefin layer. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] Please refer to Figures 1-3 The utility model proposes a kind of aluminum core low smoke halogen-free flame-retardant medium voltage fire-resistant cable, including outer sheath 1, first cable body 2 and second cable body 3, first cable body 2 and second cable body 3 are installed in the inside of outer sheath 1, and the quantity of first cable body 2 is two groups and is symmetrically arranged and installed around second cable body 3.

[0022] Both the first cable body 2 and the second cable body 3 are fixedly connected to an insulation layer 4. A flame-retardant layer 5 is fixedly connected to the outside of the insulation layer 4. A vent 6 is provided on the outside of the flame-retardant layer 5. An opening 7 is provided on the outside of the outer sheath 1. A barrier net 8 is fixedly installed inside the opening 7. A sponge layer 9 is fixedly connected to the inside of the outer sheath 1. A waterproof sleeve 10 is fixedly connected to the inside of the sponge layer 9. A filling layer 11 is filled inside the waterproof sleeve 10. The filling layer 11 is made of porous ceramic material. Porous ceramic is a material with a large number of tiny pores, which has good air permeability and high temperature resistance. The outermost layer of the filling layer 11 is wrapped with a thermoplastic polyurethane layer 12. The thermoplastic polyurethane layer 12 can provide excellent abrasion resistance and tear resistance, protecting the cable from physical damage from the external environment. The innermost layer of the outer sheath 1 is a thermoplastic polyolefin layer 16. A heat-resistant and fireproof mechanism is installed between the thermoplastic polyurethane layer 12 and the thermoplastic polyolefin layer 16.

[0023] The number of ventilation holes 6 is in several groups arranged in a ring, the number of openings 7 is in several groups arranged in a ring, and the barrier net 8 is a mesh-like hollow structure made of metal material. The barrier net 8 can block external garbage debris.

[0024] The sponge layer 9 is supported by sponge material, the waterproof sleeve 10 is made of thermally conductive material, and the thermoplastic polyolefin layer 16 is fixedly connected to the sponge layer 9. The thermoplastic polyolefin layer 16 serves as a protective layer that is in direct contact with the internal conductor of the cable, providing additional cushioning and insulation, while also having certain anti-aging and anti-corrosion properties.

[0025] The heat-resistant and fireproof mechanism includes a polyethylene fiber braided layer 13, a ceramicized silicone rubber layer 14, and a cross-linked polyethylene layer 15. The polyethylene fiber braided layer 13 is fixedly connected to the inner side of the thermoplastic polyurethane layer 12, the ceramicized silicone rubber layer 14 is fixedly connected to the inner side of the polyethylene fiber braided layer 13, the cross-linked polyethylene layer 15 is fixedly connected to the inner side of the ceramicized silicone rubber layer 14, and the cross-linked polyethylene layer 15 is fixedly connected to the outer surface of the thermoplastic polyolefin layer 16.

[0026] The working principle of an aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable based on an embodiment is as follows: When this fire-resistant cable is put into use, it will generate heat after prolonged use. Since both the first cable body 2 and the second cable body 3 are wrapped with a flame-retardant layer 5 having a large number of ventilation holes 6, the heat generated by the first cable body 2 and the second cable body 3 can pass through the ventilation holes 6, through the porous ceramic material filling layer 11, and come into contact with the waterproof sleeve 10. Because the waterproof sleeve 10 has good thermal conductivity, the heat generated by the first cable body 2 and the second cable body 3 can be quickly dissipated to the outside, preventing the internal temperature from becoming too high and causing combustion. Furthermore, when the cable is used outdoors, in rainy weather, rainwater will flow into the sponge layer 9 through the barrier net 8. Due to the characteristics of the sponge material, the entire... The sponge layer 9 retains rainwater for an extended period, reducing the temperature of the waterproof layer and providing continuous internal cooling. This effectively minimizes the risk of overheating and combustion caused by excessive heat generation inside the cable. Furthermore, the thermoplastic polyurethane layer 12 within the outer sheath 1 provides abrasion and tear resistance, while the polyethylene fiber braided layer 13 further enhances abrasion resistance. The ceramicized silicone rubber layer 14 provides fire retardancy, low smoke, and non-toxic properties. The installed cross-linked polyethylene layer 15 ensures electrical insulation performance at high temperatures, and the innermost thermoplastic polyolefin layer 16 provides cushioning and corrosion protection. Through the synergistic effect of these layers, the cable outer sheath can comprehensively withstand the challenges of the external environment, ensuring stable operation of the cable under various extreme conditions, extending its service life, and improving safety and reliability.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-smoke, halogen-free, flame-retardant, medium-voltage fire-resistant cable with an aluminum core, characterized in that: It includes an outer sheath (1), a first cable body (2) and a second cable body (3). The first cable body (2) and the second cable body (3) are both installed inside the outer sheath (1), and the number of the first cable bodies (2) is two sets, which are symmetrically arranged and installed around the second cable body (3). An insulation layer (4) is fixedly connected to the outside of both the first cable body (2) and the second cable body (3). A flame-retardant layer (5) is fixedly connected to the outside of the insulation layer (4). A vent hole (6) is opened on the outside of the flame-retardant layer (5). An opening (7) is opened on the outside of the outer sheath (1). A barrier net (8) is fixedly installed on the inside of the opening (7). A sponge layer (9) is fixedly connected to the inside of the outer sheath (1). A waterproof sleeve (10) is fixedly connected to the inside of the sponge layer (9). A filling layer (11) is filled on the inside of the waterproof sleeve (10). The filling layer (11) is filled with a porous ceramic material. The outermost layer of the filling layer (11) is wrapped with a thermoplastic polyurethane layer (12). The innermost layer of the outer sheath (1) is set as a thermoplastic polyolefin layer (16). A heat-resistant and fireproof mechanism is installed between the thermoplastic polyurethane layer (12) and the thermoplastic polyolefin layer (16).

2. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The number of the vent holes (6) is several groups arranged in a ring.

3. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The number of openings (7) is several groups arranged in a ring.

4. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The barrier net (8) is a mesh-like hollow structure made of metal material.

5. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The sponge layer (9) is supported by sponge material, and the waterproof sleeve (10) is made of thermally conductive material.

6. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The thermoplastic polyolefin layer (16) and the sponge layer (9) are fixedly connected.

7. The aluminum core low-smoke halogen-free flame-retardant medium-voltage fire-resistant cable according to claim 1, characterized in that: The heat-resistant and fireproof mechanism includes a polyethylene fiber braided layer (13), a ceramicized silicone rubber layer (14), and a cross-linked polyethylene layer (15). The polyethylene fiber braided layer (13) is fixedly connected to the inner side of the thermoplastic polyurethane layer (12), the ceramicized silicone rubber layer (14) is fixedly connected to the inner side of the polyethylene fiber braided layer (13), the cross-linked polyethylene layer (15) is fixedly connected to the inner side of the ceramicized silicone rubber layer (14), and the cross-linked polyethylene layer (15) is fixedly connected to the outer surface of the thermoplastic polyolefin layer (16).

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