High-strength impact-resistant medium-voltage power cable

Abstract

The utility model discloses a high-strength shock-resistant medium-voltage power cable, which comprises a cable core, the cable core comprises four wire cores and a filling layer, a mica wrapping layer is arranged outside the cable core, the mica wrapping layer is connected with the cable core in a fitting and winding manner, an inner lining layer is arranged outside the mica wrapping layer, and an outer lining layer is arranged outside the inner lining layer. A mica wrapping layer is arranged outside the inner lining layer, the inner lining layer and the mica wrapping layer are formed through extrusion, an armor layer is arranged outside the inner lining layer, the armor layer is attached to the inner lining layer, an anti-impact core layer is arranged outside the armor layer, an outer sheath is arranged outside the anti-impact core layer, and the outer sheath, the armor layer and the anti-impact core layer are formed through extrusion. The armor layer and the impact-resistant core layer are arranged in the medium-voltage power cable, the armor layer and the impact-resistant core layer both adopt a double-layer structure, the armor layer increases the strength of the cable, the impact-resistant core layer increases the impact resistance of the cable, and a plurality of high-strength protective materials are adopted for wrapping protection, so that the service life of the power cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a high-strength impact-resistant medium-voltage power cable. Background Art

[0002] Power cables are cable products used to transmit and distribute high-power electric energy in the main lines of the power system, including power cables with various voltage levels and various insulation levels from 1 to 500KV and above. The basic structure of power cables consists of four parts: core, insulation layer, shielding layer and protective layer. Each group of wires is insulated from each other and often twisted around a center. The entire outer layer is covered with a highly insulating covering layer. It is often used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. It has many product types and a wide range of applications, involving industries such as electricity, construction, communications, and manufacturing.

[0003] The Chinese patent publication number is CN212847790U, and the authorization announcement date is March 30, 2021. A high-strength impact-resistant power cable, wherein a plurality of conductors are arranged at the innermost center of the cable body, and the outer wall of the conductor is filled with a first filling layer, and the outer wall of the first filling layer is sleeved with an inner semi-conductive layer, and the outer wall of the inner semi-conductive layer is bonded with a main insulator, and the outer wall of the main insulator is bonded with an outer semi-conductive layer, and the outer wall of the outer semi-conductive layer is sleeved with a shielding layer, and the outer wall of the shielding layer is filled with a second filling layer, and the outer wall of the second filling layer is wrapped with a first protective layer, and the outer wall of the first protective layer is fixedly wrapped with an aluminum armor layer. This high-strength impact-resistant power cable is wrapped and protected by multiple layers of high-strength protective materials, and the internal material selection improves the strength of the power cable, and has good toughness and excellent impact resistance, thereby extending its service life.

[0004] The existing medium-voltage power cables have a single internal structure, and the cable strength and impact resistance are insufficient. When encountering external forces, the internal structure of the cable is easily damaged, which affects the normal operation and use of the cable, reduces the service life of the cable, and cannot meet the use requirements. Utility Model Content

[0005] The purpose of the utility model is to provide a high-strength impact-resistant medium-voltage power cable to solve the problem raised in the above background technology that the internal structure of the existing medium-voltage power cable is single, the strength and impact resistance of the cable are insufficient, the internal structure of the cable is easily damaged when encountering external force, which affects the normal operation and use of the cable, reduces the service life of the cable, and cannot meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength impact-resistant medium-voltage power cable, comprising a cable core, the cable core comprising a wire core and a filling layer, four wire cores are provided, a mica sheath is provided on the outside of the cable core, and the mica sheath is connected to the cable core by being wrapped in a close fit, an inner lining is provided on the outside of the mica sheath, and the inner lining and the mica sheath are formed by extrusion, an armor layer is provided on the outside of the inner lining, and the armor layer is fitted with the inner lining, an impact-resistant core layer is provided on the outside of the armor layer, an outer sheath is provided on the outside of the impact-resistant core layer, and the outer sheath, the armor layer and the impact-resistant core layer are formed by extrusion.

[0007] Preferably, the four wire cores are arranged equidistantly in a circle, and the filling layer is arranged in the gaps between the four wire cores. The wire core includes a conductor, an insulating layer and a shielding layer, and the conductor is formed by twisting a plurality of metal wires. The insulating layer is arranged on the outside of the conductor, and the shielding layer is arranged on the outside of the insulating layer, and the conductor, the insulating layer and the shielding layer are formed by extrusion.

[0008] Preferably, a nylon skeleton is provided inside the filling layer, and the nylon skeleton is arranged at equal intervals along the wire core, a through hole is provided at the center of the nylon skeleton, and an arc groove is provided on the side wall of the nylon skeleton. There are four arc grooves, and the four arc grooves are arranged at equal intervals on the side wall of the nylon skeleton, and the arc grooves are arranged corresponding to the wire core.

[0009] Preferably, the armor layer comprises an aluminum belt layer and a steel belt layer, the aluminum belt layer is arranged outside the steel belt layer, and the aluminum belt layer and the steel belt layer are woven into one.

[0010] Preferably, the impact-resistant core layer includes a polyvinyl chloride layer and a Kevlar layer, the polyvinyl chloride layer is arranged outside the Kevlar layer, and the polyvinyl chloride layer and the Kevlar layer are arranged as one body, the polyvinyl chloride layer is in contact with the outer sheath, and the Kevlar layer is in contact with the armor layer.

[0011] Preferably, the inner lining layer and the outer sheath are both made of silicone rubber, an annular reinforcing rib ring is arranged on the outside of the outer sheath, and the annular reinforcing rib ring is equidistantly arranged along the outer sheath, and the annular reinforcing rib ring is connected to the outer sheath as a whole.

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

[0013] The utility model device is provided with an armor layer and an impact-resistant core layer. The armor layer adopts a double-layer structure to protect the inside of the cable. The impact-resistant core layer adopts a double-layer structure. The polyvinyl chloride layer has good impact resistance. The Kevlar layer is a high-performance synthetic fiber with extremely high strength and impact resistance, which greatly improves the overall impact resistance of the cable. It uses multiple layers of high-strength protective materials for wrapping and protection, improves the strength of the power cable, and greatly increases the service life of the power cable.

[0014] The utility model device increases the strength of the outer sheath by setting the annular reinforcing rib ring, thereby improving the impact resistance of the cable;

[0015] The utility model device is provided with a nylon skeleton, which plays a role of positioning and supporting the wire cores, separating the wire cores to prevent the wire cores from being hit and deviating. The nylon skeleton can also improve the structural strength of the cable core and improve the impact resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 For the utility model Figure 1 A partial enlarged view of area A;

[0018] Figure 3 It is a cross-sectional view of the cable core of the utility model;

[0019] Figure 4 This is a structural diagram of the nylon skeleton of the utility model;

[0020] Figure 5 This is a structural diagram of the armor layer of the utility model;

[0021] Figure 6 This is a structural diagram of the impact-resistant core layer of the utility model.

[0022] In the figure: 1. Cable core; 2. Wire core; 3. Filling layer; 4. Mica winding layer; 5. Inner lining layer; 6. Outer sheath; 7. Annular reinforcement ring; 8. Armor layer; 9. Impact-resistant core layer; 10. Conductor; 11. Insulation layer; 12. Shielding layer; 13. Nylon skeleton; 14. Through hole; 15. Arc groove; 16. Aluminum strip layer; 17. Steel strip layer; 18. Polyvinyl chloride layer; 19. Kevlar layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-6 The utility model provides an embodiment: a high-strength impact-resistant medium-voltage power cable, comprising a cable core 1, the cable core 1 comprising a wire core 2 and a filling layer 3, four wire cores 2 are provided, a mica sheath 4 is provided on the outside of the cable core 1, and the mica sheath 4 is connected to the cable core 1 by winding, an inner lining layer 5 is provided on the outside of the mica sheath 4, and the inner lining layer 5 and the mica sheath 4 are formed by extrusion, an armor layer 8 is provided on the outside of the inner lining layer 5, and the armor layer 8 is formed with the inner lining layer 5, an impact-resistant core layer 9 is provided on the outside of the armor layer 8, an outer sheath 6 is provided on the outside of the impact-resistant core layer 9, and the outer sheath 6, the armor layer 8 and the impact-resistant core layer 9 are formed by extrusion.

[0025] See also Figure 1 and Figure 3 The four cores 2 are arranged equidistantly in a circle, and the filling layer 3 is arranged in the gap between the four cores 2. The core 2 includes a conductor 10, an insulating layer 11 and a shielding layer 12. The conductor 10 is formed by twisting a plurality of metal wires. The insulating layer 11 is arranged on the outside of the conductor 10, and the shielding layer 12 is arranged on the outside of the insulating layer 11. The conductor 10, the insulating layer 11 and the shielding layer 12 are formed by extrusion.

[0026] See also Figure 3 and Figure 4 A nylon skeleton 13 is arranged inside the filling layer 3, and the nylon skeleton 13 is arranged at equal intervals along the core 2. A through hole 14 is arranged at the center of the nylon skeleton 13. An arc groove 15 is arranged on the side wall of the nylon skeleton 13. There are four arc grooves 15, and the four arc grooves 15 are arranged at equal intervals on the side wall of the nylon skeleton 13. The arc grooves 15 are arranged corresponding to the core 2. The nylon skeleton 13 plays a positioning and supporting role for the core 2, separates the core 2, and prevents the core 2 from being hit and deviating. The nylon skeleton 13 can also improve the structural strength of the cable core 1.

[0027] See also Figure 1 , Figure 2 and Figure 5 The armor layer 8 includes an aluminum tape layer 16 and a steel tape layer 17. The aluminum tape layer 16 is arranged outside the steel tape layer 17, and the aluminum tape layer 16 and the steel tape layer 17 are woven into one. The armor layer 8 adopts a double-layer structure, which protects the inside of the cable and can also improve the strength of the power cable.

[0028] See also Figure 1 , Figure 2 and Figure 6The impact-resistant core layer 9 includes a polyvinyl chloride layer 18 and a Kevlar layer 19. The polyvinyl chloride layer 18 is arranged on the outside of the Kevlar layer 19, and the polyvinyl chloride layer 18 and the Kevlar layer 19 are arranged as a whole. The polyvinyl chloride layer 18 is bonded to the outer sheath 6, and the Kevlar layer 19 is bonded to the armor layer 8. The impact-resistant core layer 9 adopts a double-layer structure. The polyvinyl chloride layer 18 has good impact resistance. The Kevlar layer 19 is a high-performance synthetic fiber with extremely high strength and impact resistance, which greatly improves the overall impact resistance of the cable and greatly increases the service life of the power cable.

[0029] See also Figure 1 The inner lining 5 and the outer sheath 6 are both made of silicone rubber. An annular reinforcing rib ring 7 is arranged on the outside of the outer sheath 6, and the annular reinforcing rib ring 7 is arranged equidistantly along the outer sheath 6. The annular reinforcing rib ring 7 is connected to the outer sheath 6 as a whole. Silicone rubber has good cold resistance, heat resistance, electrical insulation and impact resistance. The annular reinforcing rib ring 7 increases the strength of the outer sheath 6, thereby improving the impact resistance of the cable.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength impact-resistant medium-voltage power cable, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a filling layer (3), wherein four wire cores (2) are provided, a mica sheath (4) is provided on the outside of the cable core (1), and the mica sheath (4) is connected to the cable core (1) by being wound in a manner that is close to each other, an inner lining layer (5) is provided on the outside of the mica sheath (4), and the inner lining layer (5) and the mica sheath (4) are formed by extrusion, an armor layer (8) is provided on the outside of the inner lining layer (5), and the armor layer (8) and the inner lining layer (5) are in a manner that is close to each other, an impact-resistant core layer (9) is provided on the outside of the armor layer (8), an outer sheath (6) is provided on the outside of the impact-resistant core layer (9), and the outer sheath (6), the armor layer (8) and the impact-resistant core layer (9) are formed by extrusion.

2. A high-strength impact-resistant medium-voltage power cable according to claim 1, characterized in that: The four wire cores (2) are arranged in a circular shape and at equal intervals, and the filling layer (3) is arranged at the gaps between the four wire cores (2); the wire core (2) comprises a conductor (10), an insulating layer (11) and a shielding layer (12); the conductor (10) is formed by twisting a plurality of metal wires; the insulating layer (11) is arranged outside the conductor (10); the shielding layer (12) is arranged outside the insulating layer (11); and the conductor (10), the insulating layer (11) and the shielding layer (12) are formed by extrusion.

3. A high-strength impact-resistant medium-voltage power cable according to claim 2, characterized in that: A nylon skeleton (13) is arranged inside the filling layer (3), and the nylon skeleton (13) is arranged at equal intervals along the wire core (2), a through hole (14) is arranged at the center of the nylon skeleton (13), and an arc groove (15) is arranged on the side wall of the nylon skeleton (13), four arc grooves (15) are arranged, and the four arc grooves (15) are arranged at equal intervals on the side wall of the nylon skeleton (13), and the arc grooves (15) are arranged corresponding to the wire core (2).

4. A high-strength impact-resistant medium-voltage power cable according to claim 1, characterized in that: The armor layer (8) comprises an aluminum strip layer (16) and a steel strip layer (17); the aluminum strip layer (16) is arranged outside the steel strip layer (17), and the aluminum strip layer (16) and the steel strip layer (17) are woven into one body.

5. A high-strength impact-resistant medium-voltage power cable according to claim 1, characterized in that: The impact-resistant core layer (9) comprises a polyvinyl chloride layer (18) and a Kevlar layer (19); the polyvinyl chloride layer (18) is arranged outside the Kevlar layer (19), and the polyvinyl chloride layer (18) and the Kevlar layer (19) are arranged as a whole; the polyvinyl chloride layer (18) is in contact with the outer sheath (6), and the Kevlar layer (19) is in contact with the armor layer (8).

6. A high-strength impact-resistant medium-voltage power cable according to claim 1, characterized in that: The inner lining layer (5) and the outer sheath (6) are both made of silicone rubber. An annular reinforcing rib ring (7) is arranged outside the outer sheath (6). The annular reinforcing rib ring (7) is arranged at equal distances along the direction of the outer sheath (6). The annular reinforcing rib ring (7) is connected to the outer sheath (6) as a whole.

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