Waterproof and moisture-proof low-smoke halogen-free flame-retardant radiation crosslinking power cable

Abstract

The application discloses a waterproof and moisture-proof low-smoke halogen-free flame-retardant radiation crosslinking power cable, which comprises a cable core and an insulating layer wrapped outside the cable core, a protective layer is arranged outside the insulating layer, a limiting assembly for preventing the cable core from rotating is arranged in the protective layer, a waterproof and moisture-proof sheath is arranged outside the protective layer, and a shear-resistant assembly is arranged between the waterproof and moisture-proof sheath and the protective layer; the shear-resistant assembly comprises a supporting plate fixed to the outer surface of the protective layer and an arc-shaped protective plate attached to the inner surface of the waterproof and moisture-proof sheath, and the side, away from the protective layer, of the supporting plate is attached to and fixed to the inner surface of the arc-shaped protective plate. In the application, the supporting plate and the arc-shaped protective plate are both made of rubber material, and the supporting plate and the arc-shaped protective plate cooperate to make the power cable have good shear resistance on the basis of good toughness, so that the probability of the power cable being damaged by shearing in the use process is reduced.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant, radiation-crosslinked power cable. Background Technology

[0002] With the rapid development of my country's metallurgy, power, electronics, automation and information network industries, the demand for flame-retardant wires and cables, as well as power cables, control cables, signal cables, instrument cables, computer cables and other wires and cables has increased dramatically. Traditional flame-retardant cables mostly use polyvinyl chloride as insulation or sheath.

[0003] Direct-buried cables are laid in the ground. Because they lack an outer armor layer, their shear resistance is poor. If the cable is cut, it will cause serious economic consequences and cause trouble for many companies. Therefore, direct-buried cables are required to have high shear resistance, but most existing direct-buried cables have poor shear resistance. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant, radiation-crosslinked power cable.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a waterproof and moisture-proof low-smoke halogen-free flame-retardant irradiated cross-linked power cable, comprising a cable core and an insulation layer wrapped around the outside of the cable core, a protective layer being provided outside the insulation layer, a limiting component for preventing the cable core from rotating being provided inside the protective layer, a waterproof and moisture-proof sheath being provided outside the protective layer, and an anti-shear component being provided between the waterproof and moisture-proof sheath and the protective layer;

[0006] The shear-resistant component includes a support plate fixed to the outer surface of the protective layer and an arc-shaped protective plate attached to the inner surface of the waterproof and moisture-proof sheath. The side of the support plate away from the protective layer is attached to and fixed to the inner surface of the arc-shaped protective plate. Multiple support plates and arc-shaped protective plates are provided and are evenly distributed about the axial direction of the protective layer.

[0007] By adopting the above technical solution, both the support plate and the arc-shaped protective plate can be made of rubber material. The combined effect of the support plate and the arc-shaped protective plate enables the power cable to have good shear resistance while maintaining good toughness, thereby reducing the probability of the power cable being damaged by shear during use.

[0008] Furthermore, the shear-resistant assembly also includes an intermediate plate fixed to the outer surface of the protective layer. The cross-section of the intermediate plate on the side away from the protective layer is V-shaped, and the two arc-shaped protective plates are provided with inclined abutment surfaces that cooperate with the V-shaped corners of the intermediate plate on the side that are close to each other.

[0009] The number of intermediate plates is equal to the number of support plates, and the intermediate plates and support plates are spaced apart. The shear-resistant component also includes a Y-shaped reinforcement disposed between the intermediate plates and the support plates. The support plate has a first insertion groove that engages with the Y-shaped reinforcement, and the intermediate plate has a second insertion groove that engages with the Y-shaped reinforcement. The side of the Y-shaped reinforcement away from the protective layer abuts against the inner surface of the arc-shaped protective plate.

[0010] By adopting the above technical solution, the supporting plate, arc-shaped protective plate, intermediate plate and Y-shaped reinforcement work together to enhance the structural strength of the power cable, improve the compressive strength and shear strength of the power cable, and further reduce the probability of the power cable being damaged by external forces.

[0011] Furthermore, an installation groove is provided on the outer surface of the protective layer, and a corner piece with a triangular cross-section is fixed at the corner of the Y-shaped reinforcement. A spring is fixed on the side wall of the corner piece near the protective layer, and the end of the spring away from the corner piece is fixed to the inner wall of the installation groove.

[0012] By adopting the above technical solution, the spring has good elasticity. The spring setting makes the Y-shaped reinforcement and corner piece subject to the outward support force of the protective layer and internal structure, thereby improving the shear resistance of the shear-resistant component to the power cable.

[0013] Furthermore, the space between the Y-shaped reinforcement, the support plate and the arc-shaped protective plate, as well as the space between the Y-shaped reinforcement, the intermediate plate and the arc-shaped protective plate, are all filled with a composite dry powder layer. The space between the support plate, the intermediate plate and the arc-shaped protective plate is also filled with a composite dry powder layer. The composite dry powder layer includes ammonium dihydrogen phosphate and sodium bicarbonate mixed together.

[0014] By adopting the above technical solution, ammonium dihydrogen phosphate and sodium bicarbonate are both fire extinguishing raw materials for dry powder fire extinguishers. The composite dry powder layer is made of ammonium dihydrogen phosphate and sodium bicarbonate, which gives the composite dry powder layer good flame retardant properties.

[0015] Furthermore, the composite dry powder layer also includes peppermint powder mixed with ammonium dihydrogen phosphate and sodium bicarbonate.

[0016] Furthermore, the composite dry powder layer also includes garlic powder mixed with ammonium dihydrogen phosphate, sodium bicarbonate and peppermint powder.

[0017] By adopting the above technical solution, peppermint powder and garlic powder are both smells that rodents dislike. When power cables are chewed by rodents, the peppermint powder and garlic powder in the composite dry powder layer emit pungent smells and repel rodents, reducing the probability that rodents will further damage the power cables and cause them to break.

[0018] Furthermore, the cable core is provided with three, and the limiting component includes a first limiting frame disposed within the protective layer. The first limiting frame has three arc-shaped surfaces. One arc-shaped surface of the first limiting frame is in contact with the inner surface of the protective layer, and the other two arc-shaped surfaces of the first limiting frame are in contact with the outer surfaces of two adjacent insulation layers, respectively.

[0019] Furthermore, the limiting component also includes a second limiting frame disposed between the three insulating layers. The second limiting frame has three arc-shaped surfaces, which respectively conform to the outer surfaces of the three insulating layers.

[0020] By adopting the above technical solution, the first limiting frame and the second limiting frame work together to effectively limit the cable core, thereby enhancing the stability of the power cable structure during power transmission.

[0021] Furthermore, the waterproof and moisture-proof protective sleeve comprises the following raw materials in parts by weight: 30-40 parts of polyolefin resin, 25-35 parts of polyurethane, 15-20 parts of ammonium polyphosphate, 3-6 parts of organosiloxane resin, 15-25 parts of irradiated cross-linked polyethylene, and 1-5 parts of antioxidant.

[0022] By adopting the above technical solutions, polyurethane produces carbon during combustion, which accumulates on its foam surface, helping to isolate oxygen from the underlying foam and prevent the spread of fire. Furthermore, polyurethane does not produce harmful gases at high temperatures and is harmless to the human body. Ammonium polyphosphate decomposes upon heating to produce polyphosphoric acid, absorbing heat and releasing water vapor and ammonia, diluting the concentration of flammable gases and oxygen, thus achieving gas-phase flame retardancy. In addition, the decomposition of polyphosphoric acid produces phosphoric acid, metaphosphoric acid, and polymetaphosphoric acid, which coat the cable sheath surface, causing it to dehydrate and carbonize, promoting the formation of a dense, phosphorus-rich carbon layer. This layer provides heat and oxygen insulation, preventing flammable gases from diffusing into the combustion area, thus achieving condensed-phase flame retardancy. Irradiated cross-linked polyethylene has excellent heat resistance, not decomposing or carbonizing below 300℃, and also possesses good comprehensive properties such as heat resistance, insulation, chemical corrosion resistance, crack resistance, and aging resistance. Waterproof and moisture-proof sheaths made from the above materials possess comprehensive properties including waterproofing, moisture resistance, flame retardancy, low smoke and halogen-free properties, crack resistance, aging resistance, heat resistance, insulation, and chemical corrosion resistance.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. In this application, both the support plate and the arc-shaped protective plate can be made of rubber material. The support plate and the arc-shaped protective plate work together to give the power cable good shear resistance on the basis of good toughness, thereby reducing the probability of the power cable being damaged by shear during use.

[0025] 2. In this application, the supporting plate, the arc-shaped protective plate, the intermediate plate and the Y-shaped reinforcement work together to enhance the structural strength of the power cable, improve the compressive strength and shear strength of the power cable, and further reduce the probability of the power cable being damaged by external forces.

[0026] 3. In this application, peppermint powder and garlic powder are both smells that rodents dislike. When the power cable is chewed by rodents, the peppermint powder and garlic powder in the composite dry powder layer emit irritating smells and repel rodents, reducing the probability that rodents will further damage the power cable and cause it to break.

[0027] 4. In this application, polyurethane produces carbon during combustion, which accumulates on its foam surface, helping to isolate oxygen from the underlying foam and prevent the spread of fire. Furthermore, polyurethane does not produce harmful gases at high temperatures and is harmless to humans. Ammonium polyphosphate decomposes upon heating to produce polyphosphoric acid, absorbing heat and releasing water vapor and ammonia, diluting the concentration of flammable gases and oxygen, thus achieving gas-phase flame retardancy. In addition, the decomposition of polyphosphoric acid produces phosphoric acid, metaphosphoric acid, and polymetaphosphoric acid, which coat the cable sheath surface, causing it to dehydrate and carbonize, promoting the formation of a dense, phosphorus-rich carbon layer. This provides heat and oxygen insulation, preventing flammable gases from diffusing into the combustion area, thus achieving condensed-phase flame retardancy. Irradiated cross-linked polyethylene has excellent heat resistance, not decomposing or carbonizing below 300℃, and also possesses good comprehensive properties such as heat resistance, insulation, chemical corrosion resistance, crack resistance, and aging resistance. The waterproof and moisture-proof sheath made from the above materials has comprehensive properties including waterproof and moisture-proof, flame retardant, low-smoke halogen-free, crack resistance, aging resistance, heat resistance, insulation, and chemical corrosion resistance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the anti-shear component used in an embodiment of the present invention.

[0030] In the diagram: 1. Cable core; 11. Insulation layer; 2. Protective layer; 21. Mounting groove; 3. Limiting component; 31. First limiting frame; 32. Second limiting frame; 4. Waterproof and moisture-proof sheath; 5. Shear-resistant component; 51. Support plate; 511. First insertion groove; 52. Arc-shaped protective plate; 521. Inclined contact surface; 53. Intermediate plate; 531. Second insertion groove; 54. Y-shaped reinforcement; 55. Corner piece; 56. Spring; 6. Composite dry powder layer. Detailed Implementation

[0031] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] like Figure 1 and Figure 2 As shown in the figure, this application discloses a waterproof and moisture-proof low-smoke halogen-free flame-retardant irradiated cross-linked power cable, including cable cores 1, protective layer 2, limiting component 3, waterproof and moisture-proof sheath 4, and shear-resistant component 5. The cable cores 1 are provided with three parallel ones, and each cable core 1 is wrapped with an insulation layer 11, and the protective layer 2 is sleeved on the outside of the three cable cores 1.

[0033] A limiting component 3 is disposed within the protective layer 2 to prevent the cable core 1 from rotating. The limiting component 3 includes a first limiting frame 31 and a second limiting frame 32. The first limiting frame 31 is disposed within the protective layer 2 and has three arc-shaped surfaces. One arc-shaped surface of the first limiting frame 31 is in contact with the inner surface of the protective layer 2, and the other two arc-shaped surfaces of the first limiting frame 31 are in contact with the outer surfaces of two adjacent insulating layers 11, respectively. The second limiting frame 32 is disposed between the three insulating layers 11 and has three arc-shaped surfaces, with each of the three arc-shaped surfaces of the second limiting frame 32 in contact with the outer surfaces of the three insulating layers 11, respectively.

[0034] A waterproof and moisture-proof sheath 4 is fitted onto the outside of the protective layer 2. An anti-shear component 5 is positioned between the waterproof and moisture-proof sheath 4 and the protective layer 2. The anti-shear component 5 includes a support plate 51, an arc-shaped protective plate 52, an intermediate plate 53, a Y-shaped reinforcement 54, a corner piece 55, and a spring 56. The support plate 51 is a plate-shaped structure, its length parallel to the length of the cable core 1. One side of the support plate 51 is fixed to the outer surface of the protective layer 2, and the side of the support plate 51 away from the protective layer 2 is attached and fixed to the inner surface of the arc-shaped protective plate 52. The arc-shaped protective plate 52 is an arc-shaped plate-shaped structure, its outer surface attached to the inner surface of the waterproof and moisture-proof sheath 4, and its inner surface attached and fixed to the side of the support plate 51 away from the protective layer 2. Multiple support plates 51 and arc-shaped protective plates 52 are provided and evenly distributed axially around the protective layer 2. The intermediate plate 53 is a plate-like structure, with one side fixed to the outer surface of the protective layer 2. The cross-section of the intermediate plate 53 away from the protective layer 2 is V-shaped. Each of the two arc-shaped protective plates 52 has an inclined abutment surface 521 on its side that mates with the V-shaped corner of the intermediate plate 53. The number of intermediate plates 53 is equal to the number of support plates 51, and the intermediate plates 53 and support plates 51 are spaced apart. The Y-shaped reinforcement 54 is a structural component with a "Y"-shaped cross-section, positioned between the intermediate plate 53 and the support plate 51. The support plate 51 has a first insertion slot 511 that engages with the Y-shaped reinforcement 54, and the intermediate plate 53 has a second insertion slot 531 that engages with the Y-shaped reinforcement 54. The side of the Y-shaped reinforcement 54 away from the protective layer 2 abuts against the inner surface of the arc-shaped protective plate 52. The corner piece 55 is an isosceles triangle with a cross-section of 120 degrees, and is fixed to the corner of the Y-shaped reinforcement 54. A mounting groove 21 is formed on the outer surface of the protective layer 2. One end of the spring 56 is fixed to the side wall of the corner piece 55 near the protective layer 2, and the other end of the spring 56 away from the corner piece 55 is fixed to the inner wall of the mounting groove 21. The support plate 51, the arc-shaped protective plate 52, the intermediate plate 53, and the Y-shaped reinforcement 54 work together to improve the compressive strength and shear strength of the power cable while maintaining good toughness, thus reducing the probability of the power cable breaking under external forces. The spring 56 has good elasticity, and its arrangement ensures that the Y-shaped reinforcement 54 and the corner piece 55 are supported by the outward force of the protective layer 2 and the internal structure, thereby improving the shear resistance of the shear-resistant component 5 to the power cable.

[0035] To ensure the power cable is rodent-proof, a composite dry powder layer 6 is press-filled in the spaces between the Y-shaped reinforcement 54, the support plate 51, and the arc-shaped protective plate 52, as well as in the spaces between the Y-shaped reinforcement 54, the intermediate plate 53, and the arc-shaped protective plate 52. The space between the support plate 51, the intermediate plate 53, and the arc-shaped protective plate 52 is also filled with a composite dry powder layer 6. The composite dry powder layer 6 comprises a mixture of ammonium dihydrogen phosphate, sodium bicarbonate, peppermint powder, and garlic powder. Ammonium dihydrogen phosphate and sodium bicarbonate are both extinguishing agents used in dry powder fire extinguishers. Using ammonium dihydrogen phosphate and sodium bicarbonate to create the composite dry powder layer 6 gives it excellent flame-retardant properties. Peppermint powder and garlic powder have odors that rodents dislike. When the power cable is damaged by rodents, the peppermint powder and garlic powder in the composite dry powder layer 6 emit a pungent odor that repels rodents, reducing the probability of further damage to the power cable.

[0036] In this embodiment, the waterproof and moisture-proof protective sleeve 4 comprises the following raw materials in parts by weight: 30-40 parts of polyolefin resin, 25-35 parts of polyurethane, 15-20 parts of ammonium polyphosphate, 3-6 parts of organosiloxane resin, 15-25 parts of irradiated cross-linked polyethylene, and 1-5 parts of antioxidant.

[0037] Polyurethane produces carbon when it burns, which accumulates on its foam surface, helping to isolate oxygen from the underlying foam and prevent the fire from spreading. Furthermore, polyurethane does not produce harmful gases at high temperatures and is harmless to humans. Ammonium polyphosphate decomposes upon heating to produce polyphosphoric acid, absorbing heat and releasing water vapor and ammonia, diluting the concentration of flammable gases and oxygen, thus achieving gas-phase flame retardancy. In addition, the decomposition of polyphosphoric acid produces phosphoric acid, metaphosphoric acid, and polymetaphosphoric acid, which coat the cable sheath surface, causing it to dehydrate and carbonize, promoting the formation of a dense, phosphorus-rich carbon layer. This layer provides heat and oxygen insulation, preventing flammable gases from diffusing into the combustion area, thus achieving condensed-phase flame retardancy. Irradiated cross-linked polyethylene has excellent heat resistance, not decomposing or carbonizing below 300℃, and also possesses good comprehensive properties such as heat resistance, insulation, chemical corrosion resistance, crack resistance, and aging resistance. Waterproof and moisture-proof sheaths made from the above materials possess comprehensive properties including waterproofing, moisture resistance, flame retardancy, low smoke and halogen-free properties, crack resistance, aging resistance, heat resistance, insulation, and chemical corrosion resistance.

[0038] The operating principle of the waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant irradiated cross-linked power cable in this embodiment is as follows: the supporting plate 51, the arc-shaped protective plate 52, the intermediate plate 53, and the Y-shaped reinforcement 54 work together to improve the power cable's compressive and shear resistance while maintaining good toughness, thus reducing the probability of damage caused by external forces. The spring 56 provides good elasticity, and its placement ensures that the Y-shaped reinforcement 54 and the corner piece 55 are supported by the outward force of the protective layer 2 and the internal structure, thereby improving the shear resistance of the shear-resistant component 5 on the power cable.

[0039] Ammonium dihydrogen phosphate and sodium bicarbonate are both extinguishing agents used in dry powder fire extinguishers. The composite dry powder layer 6, made from ammonium dihydrogen phosphate and sodium bicarbonate, possesses excellent flame-retardant properties. Peppermint powder and garlic powder are scents that rodents dislike. When power cables are damaged by rodents, the peppermint and garlic powder in the composite dry powder layer 6 emit pungent odors that repel rodents, reducing the probability of further damage to the power cables.

[0040] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant, radiation-crosslinked power cable, comprising a cable core (1) and an insulation layer (11) wrapped around the outside of the cable core (1), characterized in that: A protective layer (2) is provided on the outside of the insulation layer (11), a limiting component (3) for preventing the cable core (1) from rotating is provided inside the protective layer (2), a waterproof and moisture-proof sleeve (4) is provided on the outside of the protective layer (2), and an anti-shear component (5) is provided between the waterproof and moisture-proof sleeve (4) and the protective layer (2). The shear-resistant component (5) includes a support plate (51) fixed to the outer surface of the protective layer (2) and an arc-shaped protective plate (52) attached to the inner surface of the waterproof and moisture-proof sleeve (4). The side of the support plate (51) away from the protective layer (2) is attached to and fixed to the inner surface of the arc-shaped protective plate (52). Multiple support plates (51) and arc-shaped protective plates (52) are provided and are evenly distributed about the axis of the protective layer (2). The shear-resistant component (5) also includes an intermediate plate (53) fixed to the outer surface of the protective layer (2). The cross-section of the intermediate plate (53) away from the protective layer (2) is V-shaped. The two arc-shaped protective plates (52) are provided with inclined abutment surfaces (521) that cooperate with the V-shaped corners of the intermediate plate (53) on the side that is close to each other. The number of intermediate plates (53) is equal to the number of support plates (51). The intermediate plates (53) and support plates (51) are spaced apart. The shear-resistant component (5) also includes a Y-shaped reinforcement (54) disposed between the intermediate plates (53) and the support plates (51). The support plate (51) has a first insertion slot (511) that engages with the Y-shaped reinforcement (54). The intermediate plate (53) has a second insertion slot (531) that engages with the Y-shaped reinforcement (54). The side of the Y-shaped reinforcement (54) away from the protective layer (2) abuts against the inner surface of the arc-shaped protective plate (52). The outer surface of the protective layer (2) is provided with an installation groove (21). A corner piece (55) with a triangular cross-section is fixed at the corner of the Y-shaped reinforcement (54). A spring (56) is fixed on the side wall of the corner piece (55) near the protective layer (2). The end of the spring (56) away from the corner piece (55) is fixed to the inner wall of the installation groove (21).

2. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 1, characterized in that: The space between the Y-shaped reinforcement (54), the support plate (51) and the arc-shaped protective plate (52), as well as the space between the Y-shaped reinforcement (54), the intermediate plate (53) and the arc-shaped protective plate (52), are all filled with a composite dry powder layer (6). The space between the support plate (51), the intermediate plate (53) and the arc-shaped protective plate (52) is also filled with a composite dry powder layer (6). The composite dry powder layer (6) includes ammonium dihydrogen phosphate and sodium bicarbonate mixed together.

3. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 2, characterized in that: The composite dry powder layer (6) also includes peppermint powder mixed with ammonium dihydrogen phosphate and sodium bicarbonate.

4. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 3, characterized in that: The composite dry powder layer (6) also includes garlic powder mixed with ammonium dihydrogen phosphate, sodium bicarbonate and peppermint powder.

5. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 4, characterized in that: The cable core (1) is provided in three parts. The limiting component (3) includes a first limiting frame (31) disposed in the protective layer (2). The first limiting frame (31) has three arc-shaped surfaces. One arc-shaped surface of the first limiting frame (31) is attached to the inner surface of the protective layer (2). The other two arc-shaped surfaces of the first limiting frame (31) are attached to the outer surfaces of two adjacent insulation layers (11) respectively.

6. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 5, characterized in that: The limiting component (3) further includes a second limiting frame (32) disposed between the three insulating layers (11). The second limiting frame (32) has three arc-shaped surfaces, and the three arc-shaped surfaces of the second limiting frame (32) are respectively attached to the outer surfaces of the three insulating layers (11).

7. The waterproof, moisture-proof, low-smoke, halogen-free, flame-retardant radiation cross-linked power cable according to claim 5, characterized in that, The waterproof and moisture-proof protective sleeve (4) comprises the following raw materials in parts by weight: 30-40 parts of polyolefin resin, 25-35 parts of polyurethane, 15-20 parts of ammonium polyphosphate, 3-6 parts of organosiloxane resin, 15-25 parts of irradiated cross-linked polyethylene, and 1-5 parts of antioxidant.

Images