Anti-twisting loose strand type lead sheath low-voltage armored cable

Abstract

The utility model discloses an anti-twisting loose strand type lead sheath low-voltage armored cable, which comprises a tinned oxygen-free copper inner conductor layer formed by concentrically twisting a plurality of inner-layer tinned oxygen-free copper stranded wires, and a tinned oxygen-free copper outer conductor layer formed by concentrically twisting a plurality of outer-layer tinned oxygen-free copper stranded wires around the outside of the tinned oxygen-free copper inner conductor layer, an XLPE insulating layer, a double-layer polyethylene longitudinally-wrapped water-blocking isolating layer, an extruded lead sheath layer, a PVC liner layer, an aluminum wire armor layer and a PVC outer sheath are sequentially wrapped outside the tinned oxygen-free copper outer conductor layer, the pitch diameter ratio of the inner tinned oxygen-free copper stranded wire to the outer tinned oxygen-free copper stranded wire is the same and ranges from 20 to 40, the pitch diameter ratio of the inner conductor layer ranges from 10 to 25, the pitch diameter ratio of the outer conductor layer ranges from 8 to 20, and the pitch diameter ratio of the outer conductor layer ranges from 8 to 20. The pitch ratio of the inner conductor layer is larger than that of the outer conductor layer, and the twist pitch of the outer conductor layer is larger than that of the inner conductor layer. According to the cable, the structure of the stranded conductor is optimized, the reasonable pitch diameter ratio is adjusted, strand loosening of the stranded conductor is inhibited, the copper wires are prevented from being deformed and broken, and the durable applicability is improved.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to an anti-twisting loose-strand lead sheathed low-voltage armored cable. Background Art

[0002] Lead sheathed cables used in low-voltage power distribution systems can be installed indoors or outdoors, laid in cable ducts or directly buried. Lead sheaths can prevent corrosion from aromatic hydrocarbon compounds, improve power supply reliability, and have high application value. Ordinary lead sheathed cables are generally bundled conductors, which have no directional difference and can only be bundled in the same direction. They have serious loose strands and poor bending resistance. After the cable is bent to varying degrees, the conductor is subjected to torsional stress, which makes it easy for the copper wire to deform and break, posing a safety hazard and affecting electrical properties. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a lead sheathed low-voltage armored cable that prevents twisting and loosening of strands. By optimizing the stranded conductor structure and adjusting a reasonable pitch-to-diameter ratio, the cable has better anti-bending properties, helps to suppress the loosening of the stranded conductor, prevents the copper wire from deforming and breaking, and improves durability and applicability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The anti-twisting loose-strand lead sheathed low-voltage armored cable comprises a plurality of inner-layer tinned oxygen-free copper strands which are coaxially twisted to form a tinned oxygen-free copper inner conductor layer, a plurality of outer-layer tinned oxygen-free copper strands which are coaxially twisted around the outside of the tinned oxygen-free copper inner conductor layer to form a tinned oxygen-free copper outer conductor layer, the outside of the tinned oxygen-free copper outer conductor layer is sequentially coated with an XLPE insulation layer, a double-layer polyethylene longitudinally wrapped water-blocking isolation layer, an extruded lead sheath layer, a PVC cushion layer, an aluminum wire armor layer and a PVC outer sheath, the inner-layer tinned oxygen-free copper strands and the outer-layer tinned oxygen-free copper strands are of equal diameter and are a plurality of tinned oxygen-free copper monofilaments which are coaxially twisted. The inner layer tinned oxygen-free copper stranded wire and the outer layer tinned oxygen-free copper stranded wire are twisted in opposite directions, the inner layer tinned oxygen-free copper stranded wire and the outer layer tinned oxygen-free copper stranded wire have the same pitch ratio of 20 to 40, the pitch ratio of the tinned oxygen-free copper inner conductor layer is 10 to 25, the pitch ratio of the tinned oxygen-free copper outer conductor layer is 8 to 20, the pitch ratio of the tinned oxygen-free copper inner conductor layer is greater than the pitch ratio of the tinned oxygen-free copper outer conductor layer, the lay length of the tinned oxygen-free copper outer conductor layer is greater than the lay length of the tinned oxygen-free copper inner conductor layer, and the outer diameter of the tinned oxygen-free copper outer conductor layer is 4 mm to 20 mm.

[0006] Preferably, the wire diameter of the tinned oxygen-free copper monofilament is 0.1 mm to 0.5 mm, and the lay length of the tinned oxygen-free copper monofilament is 15 mm to 100 mm.

[0007] Preferably, the lay length of the tinned oxygen-free copper inner conductor layer is 25 mm to 200 mm.

[0008] Preferably, the lay length of the tinned oxygen-free copper outer conductor layer is 30 mm to 250 mm.

[0009] Preferably, the outer diameter of the inner layer tinned oxygen-free copper stranded wire is 0.5 mm to 3.5 mm.

[0010] Preferably, the double-layer polyethylene longitudinally wrapped water-blocking isolation layer is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 40% to 60%, and the double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer.

[0011] Preferably, the thickness of the XLPE insulation layer is 0.9 mm to 2.4 mm.

[0012] Preferably, the thickness of the extruded lead sheath layer is 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm.

[0013] Preferably, the aluminum wire armor layer includes an inner and outer double layer of aluminum alloy wire plain woven mesh, the inner layer of aluminum alloy wire plain woven mesh is a plain woven mesh structure woven from fine aluminum alloy wires, and the outer layer of aluminum alloy wire plain woven mesh is a plain woven mesh structure woven from coarse aluminum alloy wires, the diameter of the coarse aluminum alloy wires is 2 to 5 times the diameter of the fine aluminum alloy wires, and the weaving density of the inner layer of aluminum alloy wire plain woven mesh is greater than the weaving density of the outer layer of aluminum alloy wire plain woven mesh.

[0014] Preferably, the thickness of the PVC outer sheath is 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm or 2.6 mm.

[0015] Beneficial effects of this application:

[0016] 1. By optimizing the inner conductor to be a double-layer reverse twisted conductor layer structure of tinned oxygen-free copper inner and outer conductor layers, it is helpful to improve the flexibility and bending resistance of the inner conductor. The inner and outer conductor layers are equal-diameter tinned oxygen-free copper strands that are concentrically twisted and have the same pitch-to-diameter ratio, which helps to suppress the loose strand phenomenon. The pitch-to-diameter ratio of the tinned oxygen-free copper strands and the pitch-to-diameter ratio of the tinned oxygen-free copper inner and outer conductor layers are reasonably optimized, so that the pitch-to-diameter ratio of the inner conductor layer is greater than the pitch-to-diameter ratio of the outer conductor layer, and the lay length of the outer conductor layer is greater than the lay length of the inner conductor layer, so that the stranded conductor structure is solid, and the stranded conductor state is easy to meet the process requirements, which is beneficial to suppress loose strands and enhance the flexibility and bending resistance of the conductor. When the cable is subjected to laying bending, it is beneficial to prevent the tinned oxygen-free copper single wire from deformation, breakage, and wire breakage, improve durability and applicability, and enhance the adaptability of laying in complex environments.

[0017] 2. By adding a double-layer polyethylene longitudinal water-blocking isolation layer and a PVC cushion layer on the inner and outer sides of the extruded lead sheath layer, the extruded lead sheath layer is protected, the bending resistance is improved, and the extruded lead sheath layer is prevented from cracking. By adding a PVC cushion layer between the extruded lead sheath layer and the aluminum wire armor layer, the flexibility is improved while avoiding friction damage to the extruded lead sheath layer, thereby improving durability and applicability.

[0018] 3. By adding an aluminum wire armor layer between the PVC liner layer and the PVC outer sheath, additional mechanical protection is provided, which has a certain resistance to mechanical damage, improves the mechanical strength of the cable, protects the sheath layer, and improves durability and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-inner layer of tinned oxygen-free copper stranded wire, 2-outer layer of tinned oxygen-free copper stranded wire, 3-XLPE insulation layer, 4-double-layer polyethylene longitudinally wrapped water-blocking isolation layer, 5-extruded lead sheath layer, 6-PVC cushion layer, 7-aluminum wire armor layer, 8-PVC outer sheath. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1The anti-twisting loose-strand lead sheathed low-voltage armored cable of the embodiment of the present application includes a plurality of inner-layer tinned oxygen-free copper strands 1 coaxially twisted to form a tinned oxygen-free copper inner conductor layer, and a plurality of outer-layer tinned oxygen-free copper strands 2 coaxially twisted around the outside of the tinned oxygen-free copper inner conductor layer to form a tinned oxygen-free copper outer conductor layer. The inner-layer tinned oxygen-free copper strands 1 and the outer-layer tinned oxygen-free copper strands 2 are of equal diameter and are both composed of a plurality of tinned oxygen-free copper monofilaments coaxially twisted. Furthermore, the outer diameter of the inner-layer tinned oxygen-free copper strands 1 is 0.5 mm to 3.5 mm. Specifically, the wire diameter of the tinned oxygen-free copper monofilament is 0.1 mm to 0.5 mm, and the lay length of the tinned oxygen-free copper monofilament is 15 mm to 100 mm. The inner layer tinned oxygen-free copper stranded wire 1 and the outer layer tinned oxygen-free copper stranded wire 2 are twisted in opposite directions, the inner layer tinned oxygen-free copper stranded wire 1 and the outer layer tinned oxygen-free copper stranded wire 2 have the same pitch-to-diameter ratio of 20 to 40, the pitch-to-diameter ratio of the tinned oxygen-free copper inner conductor layer is 10 to 25, the pitch-to-diameter ratio of the tinned oxygen-free copper outer conductor layer is 8 to 20, and the pitch-to-diameter ratio of the tinned oxygen-free copper inner conductor layer is greater than the pitch-to-diameter ratio of the tinned oxygen-free copper outer conductor layer. The lay length of the tinned oxygen-free copper outer conductor layer is greater than the lay length of the tinned oxygen-free copper inner conductor layer, and further, the lay length of the tinned oxygen-free copper outer conductor layer is 30 mm to 250 mm, and the lay length of the tinned oxygen-free copper inner conductor layer is 25 mm to 200 mm. The outer diameter of the tinned oxygen-free copper outer conductor layer is 4 mm to 20 mm.

[0024] The outer conductor layer of the tinned oxygen-free copper is coated with an XLPE insulation layer 3, a double-layer polyethylene longitudinally wrapped water-blocking isolation layer 4, an extruded lead sheath layer 5, a PVC cushion layer 6, an aluminum wire armor layer 7 and a PVC outer sheath 8 in sequence, and the thickness of the XLPE insulation layer 3 is 0.9 mm to 2.4 mm. In one embodiment, the double-layer polyethylene longitudinally wrapped water-blocking isolation layer 4 is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 40% to 60%, and the double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer. The thickness of the extruded lead sheath layer 5 is 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm. In one embodiment, the aluminum wire armor layer 7 includes an inner and outer double-layer aluminum alloy wire flat woven mesh, the inner layer aluminum alloy wire flat woven mesh is a flat woven mesh structure woven from fine aluminum alloy wires, the outer layer aluminum alloy wire flat woven mesh is a flat woven mesh structure woven from coarse aluminum alloy wires, the diameter of the coarse aluminum alloy wires is 2 to 5 times the diameter of the fine aluminum alloy wires, and the inner layer aluminum alloy wire flat woven mesh has a greater weaving density than the outer layer aluminum alloy wire flat woven mesh. The thickness of the PVC outer sheath 8 is 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm or 2.6 mm.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Anti-twisting loose strand lead sheathed low-voltage armored cable, characterized by: The invention comprises a plurality of inner layer tinned oxygen-free copper strands (1) coaxially twisted to form a tinned oxygen-free copper inner conductor layer, a plurality of outer layer tinned oxygen-free copper strands (2) coaxially twisted around the outside of the tinned oxygen-free copper inner conductor layer to form a tinned oxygen-free copper outer conductor layer, the outside of the tinned oxygen-free copper outer conductor layer is sequentially coated with an XLPE insulation layer (3), a double-layer polyethylene longitudinally wrapped water-blocking isolation layer (4), an extruded lead sheath layer (5), a PVC cushion layer (6), an aluminum wire armor layer (7) and a PVC outer sheath (8), the inner layer tinned oxygen-free copper strands (1) and the outer layer tinned oxygen-free copper strands (2) are of equal diameter and are both composed of a plurality of tinned oxygen-free copper single wires of the same diameter. The inner layer tinned oxygen-free copper stranded wire (1) and the outer layer tinned oxygen-free copper stranded wire (2) are twisted in opposite directions, the inner layer tinned oxygen-free copper stranded wire (1) and the outer layer tinned oxygen-free copper stranded wire (2) have the same pitch-to-diameter ratio of 20 to 40, the pitch-to-diameter ratio of the tinned oxygen-free copper inner conductor layer is 10 to 25, the pitch-to-diameter ratio of the tinned oxygen-free copper outer conductor layer is 8 to 20, the pitch-to-diameter ratio of the tinned oxygen-free copper inner conductor layer is greater than the pitch-to-diameter ratio of the tinned oxygen-free copper outer conductor layer, the lay length of the tinned oxygen-free copper outer conductor layer is greater than the lay length of the tinned oxygen-free copper inner conductor layer, and the outer diameter of the tinned oxygen-free copper outer conductor layer is 4 mm to 20 mm.

2. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The wire diameter of the tinned oxygen-free copper monofilament is 0.1 mm to 0.5 mm, and the twist length of the tinned oxygen-free copper monofilament is 15 mm to 100 mm.

3. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The lay length of the tinned oxygen-free copper inner conductor layer is 25 mm to 200 mm.

4. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The lay length of the tinned oxygen-free copper outer conductor layer is 30 mm to 250 mm.

5. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The outer diameter of the inner layer tinned oxygen-free copper stranded wire (1) is 0.5 mm to 3.5 mm.

6. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The double-layer polyethylene longitudinally wrapped water-blocking isolation layer (4) is a double-layer polyethylene water-blocking tape longitudinally overlapped and wrapped structure with an overlap rate of 40% to 60%. The double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer.

7. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The thickness of the XLPE insulation layer (3) is 0.9 mm to 2.4 mm.

8. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The thickness of the extruded lead sheath layer (5) is 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm.

9. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1 is characterized by: The aluminum wire armor layer (7) comprises an inner and outer double-layer aluminum alloy wire flat woven mesh, wherein the inner layer aluminum alloy wire flat woven mesh is a flat woven mesh structure formed by weaving fine aluminum alloy wires, and the outer layer aluminum alloy wire flat woven mesh is a flat woven mesh structure formed by weaving coarse aluminum alloy wires, wherein the diameter of the coarse aluminum alloy wires is 2 to 5 times the diameter of the fine aluminum alloy wires, and the weaving density of the inner layer aluminum alloy wire flat woven mesh is greater than the weaving density of the outer layer aluminum alloy wire flat woven mesh.

10. The anti-twisting loose strand lead sheathed low-voltage armored cable according to claim 1, characterized in that: The thickness of the PVC outer sheath (8) is 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm or 2.6 mm.

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