Self-supporting tensile lead-in wire for overhead laying

Abstract

The utility model discloses a self-supporting tensile lead-in wire for overhead laying, which comprises two conductors and a supporting wire which are arranged at intervals and are jointly wrapped in a high-density polyvinyl chloride outer sheath layer, and the high-density polyvinyl chloride outer sheath layer forms a Y-shaped connecting rib on an interval section between the two conductors and the supporting wire. The conductor comprises a stainless steel monofilament inner core, a plurality of tinned copper wire stranded conductor layers are arranged outside the stainless steel monofilament inner core, the diameter of the conductor ranges from 0.6 mm to 1 mm, the thickness of an insulating layer formed by the high-density polyvinyl chloride outer sheath layer outside the conductor is not smaller than 1 mm, the supporting wire is a galvanized steel wire stranded wire, and the diameter of the supporting wire ranges from 1.2 mm to 1.4 mm. The lead-in wire has better bending resistance and tensile performance, reduces deformation and wire breakage of the conductor, has self-bearing performance, is suitable for overhead laying, and has better durability.

Description

Technical Field

[0001] This application relates to the technical field of cables, and particularly to a self-supporting and anti-tensile lead-in wire for overhead laying. Background Art

[0002] A lead-in wire refers to the part between the branch point and the user. When the distribution equipment has entered the user's building, the lead-in wire only includes the indoor connection. When the distribution equipment has not entered the user's building, the lead-in wire includes two parts: the outdoor lead-in wire of the user and the indoor lead wire. General lead-in wires are used to extend a pair of distribution wires from the end of the cable to the user terminal and do not have self-bearing performance. For example, when a low-voltage overhead line supplies power to the interior of a building, a section of the line between the first support point led from the overhead distribution line to the outer wall of the building, or when applied to the line from one user to another user for overhead laying, a self-supporting structure is required. However, general lead-in wires do not have self-bearing performance, and the installation for overhead laying is difficult. Moreover, the copper wire conductors of the lead-in wire are slender, and under different degrees of bending and stretching, they are prone to deformation and broken wires, affecting electrical characteristics, with poor durability, high maintenance frequency, and high maintenance costs. Utility Model Content

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide a self-supporting and anti-tensile lead-in wire for overhead laying, which has better anti-bending and anti-tensile performance, reduces conductor deformation and broken wires, has self-bearing performance, is suitable for overhead laying, and has better durability.

[0004] The above technical problem is solved by the following technical solutions in this application.

[0005] The self-supporting and anti-tensile lead-in wire for overhead laying includes two conductors and a support wire arranged at intervals and jointly coated in a high-density polyethylene outer sheath layer. The high-density polyethylene outer sheath layer is formed with Y-shaped connecting ribs in the interval section between the two conductors and the support wire. The conductor includes a stainless steel single wire inner core, and a multi-layered tin-coated copper wire stranded conductor layer is arranged outside the stainless steel single wire inner core. The diameter of the conductor is 0.6 mm to 1 mm, the thickness of the insulating layer formed by the high-density polyethylene outer sheath layer outside the conductor is not less than 1 mm, and the support wire is a galvanized steel stranded wire with a diameter of 1.2 mm to 1.4 mm.

[0006] Preferably, the diameter of the stainless steel single wire inner core is larger than the wire diameter of the tin-coated copper wire.

[0007] Preferably, the lay directions of the layers of the tin-coated copper wire stranded conductor layer are the same.

[0008] Preferably, the lay lengths of the layers of the tin-coated copper wire stranded conductor layer are different from each other and increase sequentially from the inner layer to the outer layer.

[0009] Preferably, the diameter of the conductor is 0.64 mm or 0.9 mm.

[0010] Preferably, the support wire is formed by stranding a plurality of galvanized steel wires with a wire diameter of 0.08 mm to 0.2 mm.

[0011] Preferably, the lay length of the support wire is 5 to 15 times the diameter of the support wire.

[0012] Preferably, the conductor is coated with insulating lubricating grease.

[0013] Advantages of the present application:

[0014] 1. Adding a galvanized steel wire support wire to form a triangular stable structure with two distribution wires, enabling the lead-in wire to have a self-supporting load-bearing structure. The galvanized steel wire support wire has a high tensile strength load-bearing performance, is suitable for overhead laying installation environments in complex environments, reduces the installation construction difficulty, has better flexibility in application, and can be used durably.

[0015] 2. By optimizing the conductor to be a stainless steel single wire inner core and a multi-layer tinned copper wire stranded conductor layer structure, it has better flexibility, helps to improve the anti-bending characteristics and anti-tensile performance of the conductor. The tinned copper wire stranded conductor layers have the same lay direction for increased anti-bending, and the lay lengths of each layer are different and increase sequentially from the inside to the outside, suppressing deformation and wire breakage. When undergoing overhead laying, the linear expansion coefficient of the stainless steel single wire is less than that of the tinned copper wire, which helps to balance and absorb the elongation of the lead-in wire, suppress the elongation force at the end of the lead-in wire. The tensile strength of the stainless steel single wire is greater than that of the tinned copper wire, which helps to suppress copper wire breakage, improve durability, and enhance the adaptability to laying in complex overhead environments.

[0016] 3. The high-density polyethylene outer sheath can improve the ultraviolet resistance by adding carbon black. Brief Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present application.

[0018] Description of the reference numerals:

[0019] 1 - Conductor, 2 - Support wire, 3 - High-density polyethylene outer sheath layer, 4 - Y-shaped connecting rib, 5 - Stainless steel single wire inner core, 6 - Multi-layer tinned copper wire stranded conductor layer. Detailed Embodiments

[0020] The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, rather than aiming to limit the present application. The following will describe the embodiments of the present application in detail with reference to the drawings.

[0021] SeeFigure 1 , an embodiment of the present application includes two conductors 1 and a support wire 2 arranged at intervals and jointly coated in a high-density polyvinyl chloride outer sheath layer 3, and a Y-shaped connecting rib 4 is formed on the interval section of the high-density polyvinyl chloride outer sheath layer 3 between the two conductors 1 and the support wire 2.

[0022] The conductor 1 includes a stainless steel single-wire inner core 5, and a multi-layer tinned copper wire stranded conductor layer 6 is arranged outside the stainless steel single-wire inner core 5. Specifically, the diameter of the stainless steel single-wire inner core 5 is larger than the wire diameter of the tinned copper wire. Further, the lay directions of the layers of the tinned copper wire stranded conductor layer 6 are the same, and the lay pitches of the layers of the tinned copper wire stranded conductor layer 6 are different from each other and increase sequentially from the inner to the outer. The diameter of the conductor 1 is 0.6 mm to 1 mm. For example, the diameter of the conductor 1 is 0.64 mm or 0.9 mm. The conductor 1 is coated with insulating lubricating grease. The thickness of the insulating layer formed by the high-density polyvinyl chloride outer sheath layer 3 outside the conductor 1 is not less than 1 mm, such as 1.05 mm. The support wire 2 is a galvanized steel stranded wire and has a diameter of 1.2 mm to 1.4 mm. Specifically, the support wire 2 is formed by stranding a plurality of galvanized steel wires with a wire diameter of 0.08 mm to 0.2 mm. Further, the lay pitch of the support wire 2 is 5 to 15 times the diameter of the support wire 2.

[0023] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Self-supporting tensile-resistant lead-in cable for overhead laying, characterized by: The invention comprises two conductors (1) and a support wire (2) arranged at intervals and jointly coated in a high-density polyvinyl chloride outer sheath layer (3); the high-density polyvinyl chloride outer sheath layer (3) is provided with a Y-shaped connecting rib (4) on the interval section between the two conductors (1) and the support wire (2); the conductor (1) comprises a stainless steel monofilament inner core (5); a multi-layer tinned copper wire stranded conductor layer (6) is arranged outside the stainless steel monofilament inner core (5); the diameter of the conductor (1) is 0.6 mm to 1 mm; the thickness of the insulating layer formed by the high-density polyvinyl chloride outer sheath layer (3) outside the conductor (1) is not less than 1 mm; the support wire (2) is a galvanized steel wire stranded wire with a diameter of 1.2 mm to 1.4 mm.

2. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized in that: The diameter of the stainless steel monofilament inner core (5) is greater than the diameter of the tinned copper wire.

3. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized in that: Each layer of the tinned copper wire stranded conductor layer (6) has the same stranding direction.

4. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized in that: The lay lengths of the tinned copper wire twisted conductor layers (6) are different and increase in sequence from the inner to the outer lay lengths.

5. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized in that: The conductor (1) has a diameter of 0.64 mm or 0.9 mm.

6. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized by: The support wire (2) is formed by twisting a plurality of galvanized steel wires with a wire diameter of 0.08 mm to 0.2 mm.

7. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 6 is characterized by: The lay length of the support wire (2) is 5 to 15 times the diameter of the support wire (2).

8. The self-supporting tensile-resistant lead-in cable for overhead laying according to claim 1 is characterized by: The conductor (1) is coated with insulating lubricating grease.

Images