Polyethylene low-smoke halogen-free flame-retardant power cable

Abstract

The invention relates to the technical field of cables, and provides a polyethylene low-smoke halogen-free flame-retardant power cable which comprises a conductor, an insulating layer, a sheath layer, a halogen-free flame-retardant layer, a flame-retardant filling material and a cooling assembly, the insulating layer wraps the conductor, the halogen-free flame-retardant layer is arranged outside the insulating layer, and the sheath layer wraps the sheath layer. The halogen-free flame-retardant layer is wrapped by the sheath layer, the portion between the halogen-free flame-retardant layer and the insulating layer is filled with the flame-retardant filling material, the multiple cooling assemblies are arranged outside the sheath layer and used for cooling the sheath layer, and each cooling assembly comprises two cold water rings and a cold water plate. The cold water rings are detachably arranged outside the sheath layer, the cold water plate is arranged between the two cold water rings, the cold water plate is communicated with the cold water rings, and the cold water plate is in contact with the outside of the sheath layer. According to the technical scheme, the problem that a halogen flame retardant in the prior art is only suitable for low-temperature flame retardance and is difficult to meet the flame retardance requirement of the cable at high temperature is solved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a polyethylene low-smoke halogen-free flame-retardant power cable. Background Technology

[0002] Cross-linked polyethylene (XLPE) insulated cables are made by using chemical or physical methods to transform the linear molecular structure of polyethylene insulated cables into a main network molecular structure, that is, to transform thermoplastic polyethylene into thermosetting cross-linked polyethylene. This greatly improves its heat resistance and mechanical properties, reduces its shrinkage, prevents it from melting when heated, and maintains excellent electrical properties.

[0003] Currently, flame-retardant cables mainly rely on the cable material itself for flame retardancy, namely the cable insulation layer and sheath layer. Generally, flame retardants are mixed with cable materials. The flame retardants commonly used are halogen flame retardants, which have non-flame-retardant properties, but generate a large amount of smoke and toxic gases when burning. The amount of smoke and toxic gases increases with the increase of combustion temperature, so they can only be used for low-temperature flame retardancy. Summary of the Invention

[0004] This invention proposes a polyethylene low-smoke halogen-free flame-retardant power cable to solve the problem that halogen flame retardants in the prior art are only suitable for low-temperature flame retardant applications and are difficult to meet the flame retardant requirements of cables at high temperatures.

[0005] The technical solution of the present invention is as follows: A polyethylene low-smoke halogen-free flame-retardant power cable includes a conductor, an insulation layer, and a sheath layer, wherein the insulation layer wraps around the outside of the conductor, and further includes: A halogen-free flame-retardant layer is disposed outside the insulating layer, and the sheath layer is wrapped around the outside of the halogen-free flame-retardant layer. A flame-retardant filler material, wherein the flame-retardant filler material is filled between the halogen-free flame-retardant layer and the insulating layer; A cooling assembly, wherein multiple cooling assemblies are provided, the cooling assemblies are disposed outside the sheath layer, and are used to cool the sheath layer; the cooling assembly includes: Two cold water rings are provided, and the cold water rings are detachably disposed on the outside of the sheath layer; A cold water plate is disposed between the two cold water rings, the cold water plate and the cold water rings are connected, and the cold water plate is in contact with the outside of the sheath layer.

[0006] To achieve a detachable connection of the cold water ring, the cold water ring includes two connecting half-rings, which are detachably connected by bolts.

[0007] To ensure the stability of the connecting half-ring, an anti-slip block is fixedly connected to the inner side of the connecting half-ring, and the anti-slip block is in contact with the outer side of the sheath layer.

[0008] To further ensure the stability of the cooling components, two adjacent cooling components are detachably connected by a connector, which includes: A retaining ring is fixedly connected to the cold water ring; A connecting spring is provided, with hooks fixedly connected to both ends of the connecting spring, and the hooks are attached to the fixed ring.

[0009] To enable communication between the two cooling components, a telescopic connecting pipe is also included, which is connected to the cold water ring via a quick-connect fitting.

[0010] To improve the cooling effect on the cable, a cooler is installed on the cold water ring to blow cool air onto the sheath layer.

[0011] The working principle and beneficial effects of this invention are as follows: In this invention, the cable is protected against flame retardancy by a halogen-free flame-retardant layer and flame-retardant filler material. At the same time, the external sheath layer is cooled by cold water in the cold water plate, and cold air is blown onto the cable by a cold air blower to cool the cable, reducing the melting and combustion of the cable caused by the temperature rise. The side of the cold water plate that contacts the sheath layer has a lower melting point. When the cable heats up, the side of the cold water plate that contacts the sheath layer melts first, and the cold water overflows to further cool the cable, thereby making the cable flame-retardant. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a first-view structural diagram of the entire invention; Figure 2 This is a second-view structural schematic diagram of the entire invention; Figure 3 This is a side view of the planar structure of the present invention; Figure 4 This is a structural schematic diagram of the telescopic connecting pipe, air cooler, cooling component, and connector of the present invention; Figure 5 This is a schematic diagram of the quick connector, air cooler, retaining ring, and cooling assembly of the present invention; Figure 6 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0014] In the picture: 1. Conductor; 2. Insulation layer; 3. Sheath layer; 4. Halogen-free flame-retardant layer; 5. Flame-retardant filler material; 6. Telescopic connecting pipe; 7. Quick connector; 8. Air cooler; 101. Cold water plate; 102. Connecting half ring; 103. Connecting plate; 104. Anti-slip block; 105. Cold water pipe; 201. Fixing ring; 202. Connecting spring; 203. Hook. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figures 1 to 6 As shown in the figure, this embodiment proposes a polyethylene low-smoke halogen-free flame-retardant power cable, including a conductor 1, an insulation layer 2 and a sheath layer 3. The insulation layer 2 is wrapped around the outside of the conductor 1, and also includes a halogen-free flame-retardant layer 4, a flame-retardant filler material 5 and a cooling component.

[0017] like Figures 1 to 3 As shown, the halogen-free flame retardant layer 4 is disposed outside the insulation layer 2, the sheath layer 3 is wrapped around the outside of the halogen-free flame retardant layer 4, and the flame retardant filler material 5 is filled between the halogen-free flame retardant layer 4 and the insulation layer 2. Both the halogen-free flame retardant layer 4 and the flame retardant filler material 5 contain halogen-free flame retardants. The main mechanism of action of the halogen-free flame retardants is to form a porous carbon layer, which has the advantages of low smoke and non-toxicity. The halogen-free flame retardants are mostly hydrates of metal oxides. When they decompose and dehydrate under heat absorption, they can absorb a large amount of heat, inhibit the temperature rise of the burning part and its vicinity, and the water vapor decomposed in turn prevents the release of combustible gases, thereby achieving flame retardant protection for the cable.

[0018] like Figures 1 to 5As shown, multiple cooling components are provided, located outside the sheath layer 3, for cooling the sheath layer 3. Each cooling component includes a cold water ring and a cold water plate 101. Two cold water rings are provided, detachably mounted outside the sheath layer 3. Each cold water ring includes two connecting half-rings 102, detachably connected by bolts. A connecting plate 103 is fixedly connected to each connecting half-ring 102, and the connecting plate 103 has connecting holes for bolts to pass through. The cold water plate 101 is positioned between the two cold water rings, communicating with them and contacting the outside of the sheath layer 3. An anti-slip block 104 is fixedly connected to the inner side of each connecting half-ring 102, contacting the outside of the sheath layer 3. The two connecting plates 103 can be secured by bolts. The two connecting half-rings 102 are spliced ​​together to form a complete ring, which is then fitted onto the outside of the sheath layer 3, thus ensuring that the cold water plate 101 is tightly attached to the outside of the sheath layer 3. The stability of the cold water ring and the cold water plate 101 is ensured by the anti-slip block 104. The cold water ring and the cold water plate 101 are connected by a cold water pipe 105. The inside of the cold water ring and the cold water plate 101 contains cold water, which is used to cool the cable and reduce the risk of the cable overheating and burning. At the same time, the inner side of the cold water plate 101, which is the side in contact with the sheath layer 3, is made of a material with a low melting point, which is lower than that of the sheath layer 3 and the insulation layer 2. When the cable heats up, the cold water plate 101 melts first, causing the cold water inside to flow out and cool the sheath layer 3 with water, thereby quickly cooling the cable and preventing it from burning. In addition, if the cable catches fire, the fire can be extinguished with cold water.

[0019] like Figures 1 to 6 As shown, to further ensure the stability of the cooling components, two adjacent cooling components are detachably connected via a connector. The connector includes a fixing ring 201 and a connecting spring 202. The fixing ring 201 is fixedly connected to the cold water ring, and hooks 203 are fixedly connected to both ends of the connecting spring 202. The hooks 203 are hooked onto the fixing ring 201. By hooking the hooks 203 and the fixing ring 201, the connecting spring 202 can be connected between two adjacent cold water rings, further ensuring the stability of the cooling components. 2. The cold water ring and cold water plate 101 provide a certain degree of protection to the outside of the sheath layer 3, reducing wear on the sheath layer 3. The cold water plate 101 has a certain degree of flexibility and can be made of rubber. The cold water plate 101 and the connecting spring 202 can be bent along with the cable to adapt to the cable laying. At the same time, the cooling components can be quickly disassembled and assembled through bolts and hooks 203. When the cold water plate 101 melts due to heat and cold water overflows, the corresponding cold water ring and cold water plate 101 can be replaced in time to ensure the cooling and flame-retardant effect on the cable.

[0020] like Figures 1 to 4As shown, to achieve the connection between the two cooling components, a telescopic connecting pipe 6 is also included. The telescopic connecting pipe 6 is connected to the cold water ring through a quick connector 7. The quick connector 7 can connect the telescopic connecting pipe 6 between two adjacent cold water rings, so that multiple cold water pipes 105 and multiple cold water plates 101 are interconnected. When a cold water plate 101 at a certain location is damaged by heat and cold water flows out, cold water from other locations can be concentrated at the damaged location to quickly cool down the heated location. The cold water rings on both sides can be connected to a chiller or faucet through the quick connector 7 to replenish and replace the cold water in the cold water rings and cold water plates 101, so that the cold water is in a low-temperature environment and ensures the cooling effect on the cable.

[0021] To improve the cooling effect on the cable, a cooler 8 is installed on the cooling water ring to blow cool air onto the sheath layer 3. The cooler 8 blows cool air onto the cable to cool it down, reducing the risk of spontaneous combustion caused by the cable overheating. At the same time, the cool air blows off dust and impurities from the cable surface, reducing the reduction in heat dissipation caused by dust and impurities adhering to the sheath layer 3, thereby ensuring a low-temperature environment for the cable and reducing the possibility of spontaneous combustion.

[0022] The working principle or usage process of this polyethylene low-smoke halogen-free flame-retardant power cable is as follows: Select an appropriate number of cooling components according to the length of the cable. Install the cold water rings on the outside of the sheath layer 3 with bolts. Connect the telescopic connecting pipe 6 between two adjacent cooling components with quick connectors 7 so that multiple cold water rings can be interconnected. Connect the connecting spring 202 between two adjacent cold water rings with hooks 203. The inside of the cold water rings and the cold water plate 101 contains cold water to cool the cable. The cable is cooled by blowing cold air onto the outer sheath through the air cooler 8. The cable is protected against flame retardancy by the halogen-free flame retardant layer 4 and the flame retardant filler material 5. When the cable heats up, the cooling water plate 101 is damaged by the heat first, and the cold water inside flows out to cool the cable in time, reducing the cable's temperature rise and combustion.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 polyethylene low-smoke halogen-free flame-retardant power cable, comprising a conductor (1), an insulation layer (2), and a sheath layer (3), wherein the insulation layer (2) wraps around the outside of the conductor (1), characterized in that, Also includes: A halogen-free flame retardant layer (4) is disposed outside the insulating layer (2), and the sheath layer (3) is wrapped around the outside of the halogen-free flame retardant layer (4). Flame-retardant filler material (5), which is filled between the halogen-free flame-retardant layer (4) and the insulating layer (2); A cooling component, wherein multiple cooling components are provided, the cooling components are disposed outside the sheath layer (3), and are used to cool the sheath layer (3). The cooling component includes: Two cold water rings are provided, and the cold water rings are detachably disposed on the outside of the sheath layer (3); A cold water plate (101) is disposed between two cold water rings. The cold water plate (101) is connected to the cold water rings and is in contact with the outside of the sheath layer (3).

2. The polyethylene low-smoke halogen-free flame-retardant power cable according to claim 1, characterized in that, The cold water ring includes two connecting half-rings (102), which are detachably connected by bolts.

3. The polyethylene low-smoke halogen-free flame-retardant power cable according to claim 2, characterized in that, The inner side of the connecting half-ring (102) is fixedly connected to the anti-slip block (104), and the anti-slip block (104) is in contact with the outer side of the sheath layer (3).

4. The polyethylene low-smoke halogen-free flame-retardant power cable according to claim 3, characterized in that, The two adjacent cooling components are detachably connected by a connector.

5. A polyethylene low-smoke halogen-free flame-retardant power cable according to claim 4, characterized in that, The connector includes: A fixing ring (201) is fixedly connected to the cold water ring; A connecting spring (202) is provided, and hooks (203) are fixedly connected to both ends of the connecting spring (202). The hooks (203) are attached to the fixing ring (201).

6. The polyethylene low-smoke halogen-free flame-retardant power cable according to claim 5, characterized in that, It also includes a telescopic connecting pipe (6), which is connected to the cold water ring via a quick connector (7).

7. A polyethylene low-smoke halogen-free flame-retardant power cable according to claim 6, characterized in that, A cooler (8) is installed on the cold water ring to blow cold air onto the sheath layer (3).

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