A kind of reserved power cable and preparation method

Abstract

The present invention provides a reserved power cable and a preparation method thereof, wherein a hollow copper tube provided with an extruded insulation layer is added to the cable core, and a traction rope is provided in the hollow copper tube. The present invention can connect the required cable to the steel wire rope in a reliable manner during the secondary cable laying, and reasonably pull the other end of the copper tube, so that the cable to be laid can be placed in a predetermined position, which greatly reduces the construction cost and construction time.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a reserved power cable and a preparation method thereof. Background Art

[0002] After the cable laying construction, it is often necessary to add new cables. In the existing technology, in order to add new cables, the laying site must be processed twice, which not only limits the construction space, but also is time-consuming, labor-intensive, and inefficient. In addition, it places high demands on the operators. It is necessary to avoid the possible problems of loose cable bundling, cable sagging between brackets, cable crossing, chaotic routing, etc. in the secondary laying of cables. It is also necessary to avoid wear and damage to the laid cables, which will reduce the service life of the cables and bring safety hazards. Summary of the invention

[0003] The purpose of the present invention is to provide a reserved power cable and a preparation method, so as to facilitate the addition of required cables in a completed construction environment in the future and avoid secondary laying processing on site.

[0004] To achieve the above object, the technical solution of the present invention is implemented as follows:

[0005] A reserved power cable has a hollow copper tube with an extruded insulation layer added to the cable core, and a traction rope is arranged inside the hollow copper tube.

[0006] Furthermore, the extruded insulation layer is a cross-linked polyethylene XLPE layer.

[0007] Furthermore, the traction rope is a steel wire traction rope.

[0008] Furthermore, the core of the cable core is made of 99.9999% annealed oxygen-free flexible copper wire, and the copper wire is provided with cross-linked polyethylene (XLPE) insulation.

[0009] Furthermore, the gaps in the cable core are filled with environmentally friendly flame-retardant filling ropes.

[0010] Furthermore, the cable core is wrapped with an alkali-free glass fiber tape.

[0011] Furthermore, the cable sheath is a low-smoke halogen-free polyolefin sheath.

[0012] The present invention also provides a method for preparing the above-mentioned reserved power cable, comprising:

[0013] S1. A traction rope is reserved in the hollow copper tube;

[0014] S2, the hollow copper tube is extruded with cross-linked polyethylene XLPE insulation as an extruded insulation layer of the hollow copper tube;

[0015] S3. A hollow copper tube with an extruded insulation layer is added to the cable core when the power cable is cabled.

[0016] Furthermore, the traction rope is a steel wire traction rope.

[0017] Furthermore, the gap between the cable cores with the hollow copper tube is filled with an environmentally friendly flame-retardant filling rope, which is wrapped with an alkali-free glass fiber tape and a low-smoke halogen-free polyolefin sheath.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The reserved power cable proposed in the present invention can be used to add cables again according to the needs of the scene in an environment where construction has already been completed, greatly reducing construction costs and construction time; avoiding the problems of high difficulty in operation and safety hazards caused by secondary laying;

[0020] (2) The present invention adopts a hollow copper tube as a reserved pipeline, thereby enhancing the strength of the reserved pipeline; the insulating layer arranged outside the hollow copper tube not only plays an insulating role, but also increases the softness required for the reserved pipeline to contact other wire cores, and will not cause safety hazards;

[0021] (3) The cable structure and material design adopted by the present invention greatly improve the versatility of the cable and its ability to adapt to harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0023] in:

[0024] 1. Copper tube; 2. Steel wire rope;

[0025] 3. Extruded insulation layer; 4. Copper conductor;

[0026] 5. Insulation; 6. Filling rope;

[0027] 7. Tape; 8. Sheath. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] In the description of the present invention, when a component is said to be "fixed" on another component, it may be directly on the other component, or there may be a component in the middle. When a component is described as "connected" to another component, it may be directly connected to the other component, or there may be a component in the middle. When a component is described as "set on" another component, it may be directly set on the other component or there may be a component in the middle.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] like Figure 1 As shown, the present invention specifically comprises: a copper tube 1, a steel wire rope 2, an extruded insulation layer 3, a copper conductor 4, an insulation 5, a filling rope 6, a wrapping tape 7, and a sheath 8.

[0034] In this embodiment, the cable core of the cable includes three wire cores. The copper conductor 4 in the wire core adopts 99.9999% annealed oxygen-free flexible copper wire, which can control the elongation and ensure the roundness and softness of the soft conductor. The outer diameter of the copper conductor 4 is 18.4mm; the insulation 5 of the wire core adopts cross-linked polyethylene (XLPE) insulation with an insulation thickness of 1.7mm and an outer diameter of 21.8mm; the cross-linked polyethylene insulation is controlled by the extrusion process and is tightly extruded on the conductor. The cross-section has no visible bubbles and impurities, the appearance is round, the cross-linking is sufficient, and it is easy to peel off from the conductor.

[0035] When the cable core is cabled, a hollow copper tube 1 with an outer diameter of 20 mm and a thickness of 1.0 mm is added, and the copper tube 1 is provided with an extruded insulation layer 3, that is, cross-linked polyethylene (XLPE) insulation has been extruded, the insulation thickness is 1.0 mm, and the outer diameter is 22.0 mm. A suitable steel wire rope 2 is reserved in the copper tube 1.

[0036] Two layers of 0.17×45mm alkali-free glass fiber tape are wrapped around the cable core composed of the wire core and the copper tube 1 as the wrapping tape 7. The outer diameter after wrapping is 54mm, and the cable pitch is 1855mm. The gaps in the cable are filled with environmentally friendly flame-retardant filling ropes 6 to ensure that the cable is round.

[0037] The sheath 8 is made of low-smoke halogen-free polyolefin sheath, and the extrusion process adopts a semi-extrusion die, which is directly extruded on the cable core with the wrapping tape 7 to ensure that the gaps in the cable core are tightly filled. The surface should be smooth, round, and basically uniform in color, and there should be no visible bubbles and impurities on the cross section. The outer sheath thickness is 4.0mm, and the outer diameter of the outer sheath is 62mm.

[0038] The utility model discloses that when it is necessary to add cables again, only the reserved power cable copper tube is opened, the newly added cables are connected to the steel wire traction rope in a reliable manner, and reasonable traction is performed on the other end of the copper tube, so that the cables to be laid can be placed in the predetermined position, which not only improves the efficiency but also avoids the problems of loose cable bundling, cable sagging between brackets, cable crossing, chaotic wiring, etc. during the second laying, and avoids the potential safety hazards caused by wear and damage to the laid cables.

[0039] The present invention adopts a hollow copper tube as a reserved pipeline, which enhances the strength of the reserved pipeline and avoids damage to the pipeline when a new cable is pulled; at the same time, an insulating layer arranged outside the hollow copper tube not only insulates the new cable, but also increases the softness required when the reserved pipeline contacts other wire cores, so that the wire cores are not worn or damaged due to collision and friction between the reserved pipeline and other wire cores, thereby avoiding potential safety hazards.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reserved power cable, characterized in that: A hollow copper tube with an extruded insulation layer is added to the cable core, and a traction rope is arranged inside the hollow copper tube; The extruded insulating layer is a cross-linked polyethylene XLPE layer; The core of the cable core is made of 99.9999% annealed oxygen-free flexible copper wire, and the copper wire is provided with cross-linked polyethylene XLPE insulation; The gaps in the cable core are filled with environmentally friendly flame-retardant filling ropes.

2. A reserved power cable according to claim 1, characterized in that: The traction rope is a steel wire traction rope.

3. A reserved power cable according to claim 1, characterized in that: The cable core is wrapped with an alkali-free glass fiber tape.

4. A reserved power cable according to claim 1, characterized in that: The cable sheath is low smoke halogen-free polyolefin sheath.

5. A method for preparing a reserved power cable, characterized in that: include: S1. A traction rope is reserved in the hollow copper tube; S2, the hollow copper tube is extruded with cross-linked polyethylene XLPE insulation as an extruded insulation layer of the hollow copper tube; S3. A hollow copper tube with an extruded insulation layer is added to the cable core when the power cable is cabled; The gap between the cable cores with the hollow copper tube is filled with an environmentally friendly flame-retardant filling rope, which is wrapped with an alkali-free glass fiber tape and is sheathed with a low-smoke halogen-free polyolefin sheath.

6. A method for preparing a reserved power cable according to claim 5, characterized in that: The traction rope is a steel wire traction rope.

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