Flame-retardant A-type unarmored control cable

Abstract

The utility model relates to the technical field of flame-retardant cables, in particular to a flame-retardant A-type non-armored control cable, the control cable sequentially comprises insulating single wires, a filling material, a cable core, a cable core belting layer, a shielding layer and an outer sheath from inside to outside, the filling material is composed of polypropylene filling ropes, the cable core is formed by twisting a plurality of insulating single wires, and the outer sheath is arranged between the insulating single wires. The insulating single wires are made of polyvinyl chloride materials, each polyvinyl chloride insulating single wire comprises a conductor and an insulating layer extruded on the conductor, the cable core wrapping tape layer is formed by overlapping and wrapping polyester films, the shielding layer is formed by overlapping and wrapping metal belts or weaving metal wires, and the outer sheath is made of extruded high-flame-retardant polyvinyl chloride sheath materials. The structure and the material of the flame-retardant A-type unarmored control cable disclosed by the utility model are optimized, so that the flame-retardant A-type unarmored control cable not only has excellent flame-retardant performance, but also has good mechanical strength and electrical performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flame -retardant cable, concretely is a kind of flame -retardant A non-armoured control cable. BACKGROUND

[0002] At present, the flame-retardant A PVC insulated PVC sheathed shielded non-armoured control cable has the structure of copper tape shielding outer extrusion oxygen barrier layer + flame-retardant wrapping tape + flame-retardant PVC sheath due to its high requirement for flame-retardant performance, which causes the outer diameter of the non-armoured cable to be the same as that of the armoured cable, high cable production cost, complex process and reduced cable flexibility.

[0003] CN 217767938 U discloses a flame-retardant PVC insulated and sheathed copper tape shielded fire-resistant control cable, which comprises a cable core and a wrapping tape layer, a copper tape wrapping shielding layer, a flame-retardant buffer layer and a sheath layer successively wrapped outside the cable core; the cable core comprises a pressure-bearing assembly, a wire core arranged inside the pressure-bearing assembly and a filling core arranged between the pressure-bearing assembly and the wrapping tape layer, the pressure-bearing assembly comprises a middle pressure-bearing sleeve, support rib plates arranged along the radial direction of the middle pressure-bearing sleeve and spaced apart on the outer periphery of the middle pressure-bearing sleeve, and arc-shaped pressure-bearing plates connected between the outer ends of adjacent two support rib plates; the wire core comprises a copper conductor and a fire-resistant layer, an insulating layer and a buffer protection layer successively wrapped outside the copper conductor; the flame-retardant buffer layer comprises a flame-retardant inner layer, a buffer assembly and a flame-retardant outer layer successively from inside to outside, which solves the technical problems of insufficient fire-resistant and flame-retardant performance of the control cable and poor compression resistance, but the cable has a complex structure due to the presence of the flame-retardant buffer layer and the fire-resistant layer, which increases the production difficulty and cost, and the cable bending performance is reduced after the cable core has the pressure-bearing assembly. SUMMARY

[0004] In view of the complex structure of the flame-retardant cable in the prior art, the utility model provides a flame-retardant A non-armoured control cable.

[0005] The utility model is realized through the following technical schemes:

[0006] A flame-retardant A non-armoured control cable, the control cable comprises an insulating single wire, a filling material, a cable core, a cable core wrapping tape layer, a shielding layer and an outer sheath successively from inside to outside, the filling material is composed of polypropylene filling ropes, the cable core is twisted by a plurality of insulating single wires, the insulating single wire is made of polyvinyl chloride material, the polyvinyl chloride insulating single wire comprises a conductor and an insulating layer extruded on the conductor, the cable core wrapping tape layer is composed of polyester film overlapping wrapping, the shielding layer is composed of metal tape overlapping wrapping or metal wire weaving, and the outer sheath is extruded high flame-retardant PVC sheath material; the carbonization height of the flame-retardant A bundle burning test of the cable is not greater than 1 m.

[0007] Preferably, the conductor is a soft structure or a hard structure, made of a tinned conductor or a non-tinned conductor.

[0008] Preferably, the insulating layer is extruded from flame-retardant polyvinyl chloride insulating material.

[0009] Preferably, the flame-retardant polyvinyl chloride insulating material of the insulating layer has an oxygen index of greater than or equal to 30.

[0010] Preferably, when the shielding layer is made of a metal strip, the metal strip is a pure copper strip.

[0011] Preferably, the thickness of the metal strip is 0.055mm to 0.07mm.

[0012] Preferably, when the shielding layer is made of a metal wire, the metal wire is a tinned copper wire or a non-tinned copper wire.

[0013] Preferably, the wire diameter of the metal wire is 0.12mm to 0.3mm.

[0014] Preferably, the thickness of the outer sheath is not less than 2.0mm.

[0015] Preferably, the flame-retardant polyvinyl chloride sheath material of the outer sheath has an oxygen index of greater than or equal to 38.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a kind of flame-retardant A class non-armoured control cable, and the insulating material and sheath material used are all flame-retardant polyvinyl chloride material, extrusion is convenient, ensure that cable can pass flame-retardant A class bunch burning test, cable bunch burns carbonization height is not more than 1 meter, compared with the flame-retardant A class polyvinyl chloride insulating polyvinyl chloride sheath non-armoured control cable of the past, reduce oxygen barrier layer, oxygen barrier outer wrapping tape layer Process, not only can meet the flame-retardant A class performance requirement of user to control cable, and simple structure, production efficiency is high, the control cable is adjusted cable structure and cable material, so that it meets bunch flame-retardant A class requirement, production cost is low, production process is simple, cable is light and so on Advantage.

[0018] Specifically, polypropylene filling rope is used as filling material and filled in the cable core to increase the roundness and stability of the cable core, and also helps to improve the flame-retardant property of the cable. The cable core wrapping layer is formed by overlapping and wrapping polyester film, which can provide additional protection for the cable core and also enhance the mechanical strength and weather resistance of the cable. The shielding layer can prevent external electromagnetic interference from affecting the signals in the cable. The outer sheath, as the outermost protection of the cable, is made of extruded high-flame-retardant polyvinyl chloride sheath material, which ensures that the cable can effectively prevent fire spread in case of fire.

[0019] Further, the conductor is selected according to the specific application requirement, the soft structure can improve the flexibility, and the rigid structure can enhance the mechanical strength.

[0020] Further, the polyvinyl chloride material with high flame retardant performance is selected, so that the safety of the cable under extreme conditions is ensured.

[0021] Further, the limitation of the shielding layer is considered from the electromagnetic compatibility and cost consideration, and the flexibility and applicability of the cable are increased.

[0022] Further, the thickness and oxygen index of the outer sheath are limited, so that the outer sheath has sufficient thickness and high oxygen index, so as to meet the strict requirements of the flame-retardant A class. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the flame-retardant A class non-armored control cable.

[0024] In the figure, 1, insulated single wire; 11, conductor; 12, insulation layer; 2, filling material; 3, cable core; 4, wrapping layer; 5, shielding layer; 6, outer sheath. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in combination with specific embodiments, and the explanation is not limitation.

[0026] The utility model discloses a kind of flame-retardant A class non-armored control cable, refer to Figure 1 , control cable includes insulated single wire, filling material, cable core, cable core wrapping layer, shielding layer, outer sheath from inside to outside in turn, filling material is composed of polypropylene filling rope, cable core is stranded by multiple insulated single wires, insulated single wire is made of polyvinyl chloride material, polyvinyl chloride insulated single wire includes conductor and insulation layer extruded on conductor, wherein, conductor is soft structure or hard structure, made of tinned conductor or non-tinned conductor, to adapt to the demand of different application scenarios. Insulation layer is extruded from flame-retardant polyvinyl chloride insulation material, and the oxygen index of flame-retardant polyvinyl chloride insulation material of insulation layer is ≥30, to ensure the flame-retardant performance of cable in fire. Filling material composed of polypropylene filling rope not only increases the stability and roundness of cable core, but also further improves the flame-retardant effect of cable.

[0027] Cable core wrapping layer is composed of polyester film overlapping wrapping, which can provide additional protective barrier for cable core, and enhance the mechanical strength and wear resistance of cable.

[0028] The shielding layer is made of metal band or metal wire, and the metal band is made of pure copper band with a thickness of 0.055mm-0.07mm, and the metal wire is made of tinned copper wire or untinned copper wire with a wire diameter of 0.12mm-0.3mm.

[0029] The outer sheath is made of high-flame-retardant PVC sheath material, and the thickness of the outer sheath is not less than 2.0mm, so that the cable can be provided with strong external protection.

[0030] The utility model discloses a kind of flame-retardant A class non-armoured control cables, which are optimized in structure and material, not only have excellent flame-retardant performance, but also have good mechanical strength and electrical properties. After flame-retardant A class bunch combustion test verification, the carbonization height of the cable is not more than 1m, which fully proves its safety and reliability in fire.

[0031] The utility model discloses a kind of flame-retardant A class non-armoured control with cable insulation single wire as the basic transmission unit of cable, each insulation single wire is made of polyvinyl chloride material, including conductor and its insulating layer on it. Conductor can select soft structure or hard structure, material can select tinned or untinned conductor, can adapt to different use demand. At the same time, insulating layer is made of flame-retardant PVC insulating material and is extruded, which can ensure that it has good flame-retardant performance and electrical insulation performance. Therefore, the control cable has the advantages of excellent flame-retardant performance, simple structure, small outer diameter, easy to install and use, low production cost, simple production process and the like.

[0032] The above is only the preferred embodiment of the utility model, and does not limit the technical scheme of the utility model in any way. Those skilled in the art should understand that the technical scheme can be modified and replaced in several simple ways without departing from the spirit and principles of the utility model. These modifications and replacements also fall within the scope of protection covered by the claims.

Claims

1. A flame retardant Class A non-armored control cable, characterized in that: The control cable comprises, from the inside to the outside, an insulating single wire, a filling material, a cable core, a cable core tape layer, a shielding layer, and an outer sheath. The filling material is composed of a polypropylene filling rope. The cable core is formed by twisting multiple insulating single wires. The insulating single wire is made of polyvinyl chloride material. The polyvinyl chloride insulated single wire includes a conductor and an insulating layer extruded on the conductor. The cable core tape layer is composed of overlapping polyester film wrapping. The shielding layer is formed by overlapping metal tape wrapping or braiding metal wire. The outer sheath is an extruded highly flame-retardant polyvinyl chloride sheathing material. The carbonization height of the flame-retardant Class A bundled burning test of the cable is not more than 1m.

2. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: The conductor is of a soft structure or a hard structure and is made of a tinned conductor or a non-tinned conductor.

3. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: The insulating layer is made of flame-retardant polyvinyl chloride insulating material through extrusion.

4. The flame-retardant Class A non-armored control cable according to claim 3, characterized in that: The flame retardant polyvinyl chloride insulation material of the insulation layer has an oxygen index of ≥30.

5. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: When the shielding layer is made of a metal tape, the metal tape is a pure copper tape.

6. The flame-retardant Class A non-armored control cable according to claim 5, characterized in that: The thickness of the metal strip is 0.055 mm to 0.07 mm.

7. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: When the shielding layer is made of metal wire, the metal wire is tinned copper wire or non-tinned copper wire.

8. The flame-retardant Class A non-armored control cable according to claim 7, characterized in that: The wire diameter of the metal wire is 0.12mm to 0.3mm.

9. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: The thickness of the outer sheath is not less than 2.0 mm.

10. The flame-retardant Class A non-armored control cable according to claim 1, characterized in that: The flame retardant polyvinyl chloride sheath material of the outer sheath has an oxygen index of ≥38.

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