Buried cable

Abstract

The utility model discloses a buried cable, and belongs to the technical field of cable production. Comprising a shielding sleeve, the outer wall of the shielding sleeve is sleeved with a cable buffer sleeve, the outer wall of the cable buffer sleeve is sleeved with an outer protection sleeve, the cable buffer sleeve comprises a polypropylene sleeve and buffer filling particles, and the polypropylene sleeve is internally provided with a plurality of buffer filling particles. The outer protection sleeve comprises an outer protection sleeve, thermal plastic, shape memory alloy wires and a woven steel belt, the thermal plastic is pasted on the inner wall of the outer protection sleeve, the shape memory alloy wires are arranged in the thermal plastic, and the shape memory alloy wires are uniformly and annularly distributed. The good flexibility, high temperature resistance and electrical insulation performance of the cable are benefited from the high bond energy of a silicon-oxygen bond in a silicone rubber molecular structure, so that the cable is not easy to decompose in a high-temperature environment, and the insulation effect of the cable is effectively guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of cable production, and more specifically, to a buried cable. Background Art

[0002] A buried cable is a cable laid underground. It has an insulating and protective outer sheath, which can avoid the direct influence of the external environment on the cable. In terms of advantages, it does not occupy ground space, making the environment cleaner and more beautiful; it reduces the risk of mechanical damage and bad weather (damage) due to being exposed, and also reduces the possibility of human damage, improving the reliability and safety of power supply;

[0003] Once the outer sheath of the existing cable is scratched or damaged, it is easy to cause the sheath to break, exposing the internal structure of the cable to the external environment, increasing the risk of cable damage. At the same time, the outer sheath has limited ability to resist mechanical external force impact. When facing high-strength mechanical external forces that may occur in the buried environment, problems such as sheath rupture and cable deformation are likely to occur. And after the ordinary cable is deformed due to local external force, it often produces permanent deformation, affecting the performance and service life of the cable.

[0004] In view of this, we propose a buried cable. Utility Model Content

[0005] The purpose of this application is to provide a buried cable, which solves the technical problems in the above background art and achieves the technical effect of a buried cable.

[0006] The technical solution of this application provides a buried cable, including a shielding sleeve. An outer cable buffer sleeve is sleeved on the outer wall of the shielding sleeve, and an outer protective sleeve is sleeved on the outer wall of the cable buffer sleeve. The cable buffer sleeve includes a polypropylene sleeve and buffer filling particles. A plurality of buffer filling particles are arranged inside the polypropylene sleeve. The outer protective sleeve includes an outer sheath, a thermoplastic, shape memory alloy wires, and a woven steel strip. A thermoplastic is pasted on the inner wall of the outer sheath. A plurality of shape memory alloy wires are arranged inside the thermoplastic, and the plurality of shape memory alloy wires are evenly distributed in a ring shape. A woven steel strip is pasted on the inner wall of the thermoplastic.

[0007] Optionally, a plurality of insulating sleeves are arranged inside the shielding sleeve. The material of the insulating sleeve is silicone rubber, and a plurality of copper conductors are arranged inside the insulating sleeve.

[0008] Optionally, a waterproof film is pasted on the outer wall of the outer protective sleeve. The material of the waterproof film is a polyurethane waterproof film.

[0009] Optionally, the shielding sleeve includes a graphene braided sleeve and a shielding interlayer. The shielding interlayer is fixedly connected inside the graphene braided sleeve, and the material of the shielding interlayer is metal nickel foil.

[0010] Optionally, the cable buffer sleeve includes a polypropylene sleeve and buffer filling particles. A plurality of buffer filling particles are provided inside the polypropylene sleeve, and the material of the buffer filling particles is hollow ceramic microspheres.

[0011] Optionally, the material of the outer sheath is a self-healing polymer, and the material of the thermoplastic is thermoplastic polyurethane.

[0012] One or more technical solutions provided in the technical solution of the present application have at least the following technical effects or advantages:

[0013] In the present application, the insulating sleeve is made of silicone rubber. Its good flexibility, high temperature resistance, and electrical insulation performance benefit from the high bond energy of the silicon-oxygen bond in the silicone rubber molecular structure, making it not easily decomposed in a high-temperature environment and effectively ensuring the insulation effect of the cable.

[0014] The shielding sleeve is composed of a graphene braided sleeve and a shielding interlayer of nickel foil. The graphene braided sleeve has extremely high electrical conductivity and thermal conductivity. The continuously conductive network formed by braiding can effectively shield external electromagnetic field interference and reduce internal signal external radiation, while the high magnetic permeability of the metal nickel foil can effectively shield low-frequency electromagnetic field interference.

[0015] The polypropylene sleeve in the cable buffer sleeve cooperates with the buffer filling particles of hollow ceramic microspheres. Utilizing the good heat preservation, heat insulation, and buffering performance of the polypropylene sleeve and the low density, high compressive strength, and good heat insulation performance of the hollow ceramic microspheres, the compressive strength and buffering performance are improved without increasing the weight, effectively protecting the internal components.

[0016] The outer sheath inside the external protective sleeve is made of a self-healing polymer and has a self-repairing function. When slightly scratched or damaged, under certain conditions, polymer molecules can rearrange and combine to achieve automatic repair and maintain integrity. The thermoplastic on the inner wall of the outer sheath is thermoplastic polyurethane, which has the characteristics of high strength, high toughness, wear resistance, and oil resistance, and can resist mechanical external force impacts in the buried environment. When the cable is deformed by local external force, the shape memory alloy wire inside the outer sheath can deform, and after the external force disappears, it returns to its original shape and drives the cable to recover, preventing permanent deformation. The braided steel belt tightly attached to the cable buffer sleeve provides high toughness and extends the service life, and the holes inside the braided steel belt play a role in ventilation and heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the buried cable disclosed in the embodiment of the present application;

[0018] Figure 2 Structural schematic diagram of the buried cable shielding sleeve disclosed in the embodiment of the present application;

[0019] Figure 3 Structural schematic diagram of the buried cable buffer sleeve of the embodiment of the present application;

[0020] Figure 4 Structural schematic diagram of the external protective sleeve of the buried cable disclosed in the embodiment of the present application;

[0021] Explanation of the reference numerals in the figure: 1, shielding sleeve; 2, insulating sleeve; 3, copper conductor; 4, cable buffer sleeve; 5, external protective sleeve; 6, waterproof film; 101, graphene braided sleeve; 102, shielding interlayer; 401, polypropylene sleeve; 402, buffer filling particles; 501, outer sheath; 502, thermoplastic; 503, shape memory alloy wire; 504, braided steel strip. Specific embodiments

[0022] The present application will be further described in detail below with reference to the accompanying drawings of the specification.

[0023] Refer to Figure 1 and Figure 4 According to [relevant figures], the embodiment of the present application provides a buried cable, including a shielding sleeve 1. An outer wall of the shielding sleeve 1 is sleeved with a cable buffer sleeve 4, an outer wall of the cable buffer sleeve 4 is sleeved with an external protective sleeve 5. The cable buffer sleeve 4 includes a polypropylene sleeve 401 and buffer filling particles 402. A plurality of buffer filling particles 402 are arranged inside the polypropylene sleeve 401. The external protective sleeve 5 includes an outer sheath 501, a thermoplastic 502, shape memory alloy wires 503 and a braided steel strip 504. The thermoplastic 502 is pasted on an inner wall of the outer sheath 501. A plurality of shape memory alloy wires 503 are arranged inside the thermoplastic 502, and the plurality of shape memory alloy wires 503 are evenly distributed in a ring shape. The braided steel strip 504 is pasted on an inner wall of the thermoplastic 502. The outer sheath 501 is made of a self-healing polymer. The self-healing polymer has a self-repairing function. When it is slightly scratched or damaged, under certain conditions, polymer molecules can rearrange and combine to achieve automatic repair and maintain integrity. The thermoplastic 502 is made of thermoplastic polyurethane. Thermoplastic polyurethane has the characteristics of high strength, high toughness, wear resistance and oil resistance, and can resist mechanical external force impact in the buried environment. When the cable is deformed by local external force, the shape memory alloy wires 503 inside the outer sheath 501 can deform, and return to their original state after the external force disappears, driving the cable to recover and preventing permanent deformation. The braided steel strip 504 in close contact with the cable buffer sleeve 4 provides high toughness and improves the service life, and the holes inside the braided steel strip 504 play a role in ventilation and heat dissipation.

[0024] Refer to Figure 1, there are multiple insulating sleeves 2 inside the shielding sleeve 1. The insulating sleeve 2 is made of silicone rubber. Inside the insulating sleeve 2, there are multiple copper conductors 3. The insulating sleeve 2 is made of silicone rubber. Its good flexibility, high temperature resistance and electrical insulation performance benefit from the high bond energy of the silicon-oxygen bond in the silicone rubber molecular structure, making it not easily decomposed in high-temperature environments and effectively ensuring the insulation effect of the cable.

[0025] Refer to Figure 1 , a waterproof film 6 is pasted on the outer wall of the external protective sleeve 5. The waterproof film 6 is made of polyurethane waterproof film, further improving the waterproof performance of the cable.

[0026] Refer to Figure 2 , the shielding sleeve 1 includes a graphene braided sleeve 101 and a shielding interlayer 102. The shielding interlayer 102 is fixedly connected inside the graphene braided sleeve 101. The shielding interlayer 102 is made of metal nickel foil. The graphene braided sleeve 101 has extremely high electrical conductivity and thermal conductivity. The continuous conductive network formed by braiding can effectively shield external electromagnetic field interference and reduce the external radiation of internal signals. The high magnetic permeability of the metal nickel foil can effectively shield low-frequency electromagnetic field interference.

[0027] Refer to Figure 3 , the cable buffer sleeve 4 includes a polypropylene sleeve 401 and buffer filling particles 402. There are multiple buffer filling particles 402 inside the polypropylene sleeve 401. The buffer filling particles 402 are made of hollow ceramic microspheres. The polypropylene sleeve 401 and the buffer filling particles 402 of hollow ceramic microspheres in the cable buffer sleeve 4 cooperate. Utilizing the good heat preservation, heat insulation and buffering performance of the polypropylene sleeve 401 and the low density, high compressive strength and good heat insulation performance of the hollow ceramic microspheres, the compressive strength and buffering performance are improved without increasing the weight, effectively protecting the internal components.

[0028] Working principle: When producing local buried cables, first fill multiple copper conductors 3 into the insulating sleeve 2 made of silicone rubber. Silicone rubber has good flexibility, high temperature resistance and electrical insulation performance. Due to the relatively high bond energy of the silicon-oxygen bond in the molecular structure of silicone rubber, silicone rubber is not easily decomposed in high-temperature environments. After multiple insulating sleeves 2 are assembled, the multiple insulating sleeves 2 are placed into the shielding sleeve 1, and then sealant is injected into the shielding sleeve 1. The shielding sleeve 1 is composed of a graphene braided sleeve 101 and a shielding interlayer 102. The graphene braided sleeve 101 has extremely high electrical conductivity and thermal conductivity. In the shielding sleeve 1, multiple layers of graphene form a continuous conductive network through braiding. This braided structure enables graphene to effectively shield external electromagnetic field interference and also reduces the external radiation of internal signals of the cable. The shielding interlayer 102 made of metal nickel foil is located inside the graphene braided sleeve 101, forming a complementary shielding effect with graphene. The metal nickel foil has a relatively high magnetic permeability and can effectively shield low-frequency electromagnetic field interference;

[0029] After the shielding sleeve 1 is properly installed, the cable buffer sleeve 4 is sleeved onto the shielding sleeve 1. The polypropylene sleeve 401 inside the cable buffer sleeve 4 has good heat preservation, heat insulation and buffering properties. Cooperating with the buffer filling particles 402 made of hollow ceramic microspheres as the internal material, it can effectively absorb the external impact force and protect the internal copper conductor 3, insulating sleeve 2 and shielding sleeve 1. The hollow ceramic microspheres have low density, high compressive strength and good heat insulation performance. They can further improve the compressive strength and buffering performance of the buffer layer without increasing the weight of the buffer layer;

[0030] After the installation of the cable buffer sleeve 4 is completed, an external protective sleeve 5 is sleeved onto the cable buffer sleeve 4. The internal material of the external protective sleeve 5 is an outer sheath 501 made of self-healing polymer. The self-healing polymer can achieve self-repair function. When the external protective sleeve 5 is slightly scratched or damaged, under certain conditions, the polymer molecules can rearrange and combine, so as to achieve automatic repair and maintain the integrity of the external protective sleeve 5. The thermoplastic rubber 502 on the inner wall of the outer sheath 501 is thermoplastic polyurethane, which has the characteristics of high strength, high toughness, wear resistance and oil resistance. In the external protective sleeve 5, the outer sheath 501 can effectively resist the mechanical external force impact in the buried environment. When the cable is deformed by local external force, the shape memory alloy wire 503 inside the outer sheath 501 can deform. When the external force disappears, the shape memory alloy wire 503 can return to its original shape, thereby driving the cable to return to its original shape and preventing the cable from undergoing permanent deformation due to long-term stress. The braided steel strip 504 that is in close contact with the cable buffer sleeve 4 provides the function of high toughness, improves the service life of the cable, and the braided braided steel strip 504 has holes inside, playing a certain role in ventilation and heat dissipation. Finally, a waterproof film 6 made of polyurethane waterproof film is wrapped around the outside of the external protective sleeve 5 to further improve the waterproofness of the cable.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. An underground cable, comprising a shielding sleeve (1), characterized in that: An outer wall of the shielding sleeve (1) is sleeved with a cable buffer sleeve (4), an outer wall of the cable buffer sleeve (4) is sleeved with an external protective sleeve (5), the cable buffer sleeve (4) includes a polypropylene sleeve (401) and buffer filling particles (402), a plurality of buffer filling particles (402) are arranged inside the polypropylene sleeve (401), the external protective sleeve (5) includes an outer sheath (501), a thermoplastic (502), shape memory alloy wires (503) and a woven steel strip (504), the thermoplastic (502) is adhered to an inner wall of the outer sheath (501), a plurality of shape memory alloy wires (503) are arranged inside the thermoplastic (502), and the plurality of shape memory alloy wires (503) are uniformly distributed in a ring shape, and the woven steel strip (504) is adhered to an inner wall of the thermoplastic (502).

2. The buried cable according to claim 1, characterized in that: A plurality of insulating sleeves (2) are arranged inside the shielding sleeve (1), the insulating sleeves (2) are made of silicone rubber, and a plurality of copper conductors (3) are arranged inside the insulating sleeves (2).

3. The buried cable according to claim 1, wherein: A waterproof film (6) is adhered to an outer wall of the external protective sleeve (5), and the waterproof film (6) is made of a polyurethane waterproof film.

4. The buried cable according to claim 1, wherein: The shielding sleeve (1) includes a graphene woven sleeve (101) and a shielding interlayer (102), the shielding interlayer (102) is fixedly connected inside the graphene woven sleeve (101), and the shielding interlayer (102) is made of a metal nickel foil.

5. The buried cable according to claim 1, characterized in that: The cable buffer sleeve (4) includes a polypropylene sleeve (401) and buffer filling particles (402), a plurality of buffer filling particles (402) are arranged inside the polypropylene sleeve (401), and the buffer filling particles (402) are made of hollow ceramic microspheres.

6. The buried cable according to claim 1, wherein: The outer sheath (501) is made of a self-healing polymer, and the thermoplastic (502) is made of thermoplastic polyurethane.

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