Shielded safety cable

Abstract

The utility model discloses a shielded safety cable, which comprises a cable and a B1-level low-smoke halogen-free flame-retardant sheath extruded outside the cable, and is characterized by further comprising a copper wire braided shielding layer which is embedded in the B1-level low-smoke halogen-free flame-retardant sheath. According to the utility model, the copper wire braided shielding layer is embedded into the B1-level low-smoke halogen-free flame-retardant sheath, so that the copper wire braided shielding layer is not easy to slide, and meanwhile, the cable is formed by filling and twisting the four core wires and the five low-smoke halogen-free environment-friendly ropes, is of a symmetrical structure and is not easy to twist.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a shielded safety cable. Background Art

[0002] Cables are usually rope-like cables made of several or several groups of wires (at least two in each group). 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, which has the characteristics of internal power supply and external insulation. Existing cables can be roughly divided into flame-retardant rubber-sheathed cables, nuclear-grade cables, power cables, and flexible fire-resistant cables. In the process of wire and cable processing and manufacturing, wire and cable products are usually made by adding layers of insulation, shielding, cabling and sheathing on the outer periphery of the conductor. Different structures are added according to different application scenarios. The more complex the structure of the product, the more layers are superimposed.

[0003] The shielding layer in the current shielded safety cable is generally arranged between the outer sheath and the inner insulating layer. The shielding layer is easy to slide between the outer sheath and the inner insulating layer. In addition, the distribution of the cables and the filling ropes of this type of shielded safety cable is asymmetrical, which easily causes the cable to twist. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a shielded safety cable in which the shielding layer is not easy to slide relative to the outer sheath and is not easy to twist in view of the above-mentioned shortcomings of the current shielded safety cable.

[0005] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0006] A shielded safety cable comprises a cable and the B1-level low-smoke halogen-free flame-retardant sheath extruded outside the cable, characterized in that it also comprises a copper wire braided shielding layer, and the copper wire braided shielding layer is embedded in the B1-level low-smoke halogen-free flame-retardant sheath.

[0007] In a preferred embodiment of the utility model, a low-smoke halogen-free flame-retardant wrapping tape is wound around the outer circumference of the cable, and the B1-level low-smoke halogen-free flame-retardant sheath is extruded on the low-smoke halogen-free flame-retardant wrapping tape.

[0008] In a preferred embodiment of the utility model, the cable is formed by twisting four core wires and five low-smoke halogen-free environmentally friendly ropes, the four core wires are arranged in a square, the five low-smoke halogen-free environmentally friendly ropes are arranged in a cross, one low-smoke halogen-free environmentally friendly rope is filled between the four core wires, and the other four low-smoke halogen-free environmentally friendly ropes are filled between two core wires respectively.

[0009] In a preferred embodiment of the utility model, each core wire comprises a plurality of strands of soft copper wire conductors, a mica tape wrapped around the plurality of strands of soft copper wire conductors, and a low-smoke halogen-free flame-retardant insulation layer extruded on the mica tape.

[0010] In a preferred embodiment of the present invention, three of the four core wires are phase wires and one is a neutral wire.

[0011] Due to the adoption of the above technical solution, the utility model embeds the copper wire braided shielding layer into the B1 grade low-smoke halogen-free flame retardant sheath, so that the copper wire braided shielding layer is not easy to slide. At the same time, the cable is twisted by four core wires and five low-smoke halogen-free environmentally friendly ropes, which is a symmetrical structure and not easy to twist. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional schematic diagram of the shielded safety cable of the utility model. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0014] See also Figure 1 The shielded safety cable shown in the figure includes a cable 100 and a B1-level low-smoke halogen-free flame-retardant sheath 200 extruded outside the cable 100, and also includes a copper wire braided shielding layer 300. The copper wire braided shielding layer 300 is embedded in the B1-level low-smoke halogen-free flame-retardant sheath 200, so that the copper wire braided shielding layer 300 is not easy to slide.

[0015] A low-smoke halogen-free flame-retardant wrapping tape 400 is wound around the outer periphery of the cable 100 , and a B1-grade low-smoke halogen-free flame-retardant sheath is extruded onto the low-smoke halogen-free flame-retardant wrapping tape 400 .

[0016] The cable 100 is formed by twisting four core wires 110, 120, 130, 140 and five low-smoke halogen-free environmentally friendly ropes 510, 520, 530, 540, 550, and is symmetrical and not easily twisted. The four core wires 110, 120, 130, 140 are arranged in a square, the five low-smoke halogen-free environmentally friendly ropes 510, 520, 530, 540, 550 are arranged in a cross, one low-smoke halogen-free environmentally friendly rope 550 is filled between the four core wires 110, 120, 130, 140, and the other four low-smoke halogen-free environmentally friendly ropes 510, 520, 530, 540 are filled between two core wires 110, 120, 130, 140 respectively.

[0017] Each core wire 110 , 120 , 130 , 140 includes a multi-strand twisted soft copper wire conductor 610 , a mica tape 620 wrapped around the multi-strand twisted soft copper wire conductor 610 , and a low-smoke halogen-free flame-retardant insulation layer 630 extruded on the mica tape 620 .

[0018] The core wires 110 , 120 , and 130 are phase wires, and the core wire 140 is a neutral wire.

Claims

1. A shielded safety cable, comprising a cable and a B1-level low-smoke halogen-free flame-retardant sheath extruded outside the cable, characterized in that: It also includes a copper wire braided shielding layer, wherein the copper wire braided shielding layer is embedded in the B1-level low-smoke halogen-free flame-retardant sheath; A low-smoke halogen-free flame-retardant wrapping tape is wound around the outer periphery of the cable, and the B1-level low-smoke halogen-free flame-retardant sheath is extruded on the low-smoke halogen-free flame-retardant wrapping tape; The cable is formed by twisting four core wires and five low-smoke halogen-free environmentally friendly ropes, the four core wires are arranged in a square, the five low-smoke halogen-free environmentally friendly ropes are arranged in a cross, one low-smoke halogen-free environmentally friendly rope is filled between the four core wires, and the other four low-smoke halogen-free environmentally friendly ropes are filled between two core wires respectively.

2. The shielded safety cable according to claim 1, characterized in that: Each core wire comprises a plurality of stranded soft copper wire conductors, a mica tape wrapped around the plurality of stranded soft copper wire conductors, and a low-smoke halogen-free flame-retardant insulating layer extruded on the mica tape.

3. The shielded safety cable according to claim 1 or 2, characterized in that: Three of the four core wires are phase wires and one is the neutral wire.

Images