CN223552288U - Low-smoke halogen-free flame-retardant insulated cable - Google Patents

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant insulated cable, which belongs to the technical field of cables and comprises a cable core unit, wherein a filling layer is arranged outside the cable core unit, an inner fireproof wrapping tape is wound outside the filling layer, an inner lining layer is arranged outside the inner fireproof wrapping tape, an armor layer is arranged outside the inner lining layer, an outer sheath is arranged outside the armor layer, a spiral groove is formed in the outer surface of the outer sheath, an outer fireproof wrapping tape is wound on the bottom wall of the spiral groove along the rotation direction of the spiral groove, and fireproof coatings are coated on the outer surface of the outer sheath except the groove bottom wall of the spiral groove. The low-smoke halogen-free flame-retardant insulated cable realizes the inner and outer common fireproof function, can prevent the outer fireproof wrapping tape from being easily damaged, has strong torsion resistance and compression resistance, and reduces cable damage.

Description

Low-smoke halogen-free flame-retardant insulated cable

Technical Field

The utility model relates to the technical field of cables, in particular to a low-smoke halogen-free flame-retardant insulated cable.

Background

Flame-retardant cables are cables which can prevent or delay the spread of fire by themselves in extreme cases such as fire. Flame retardant performance is one of the most important characteristics of flame-retardant cables, and in general, the flame-retardant cables are manufactured by adopting a special flame retardant formula and process, so that the cables can not generate very high combustion temperature when being roasted by open fire, can continuously transmit power even at high temperature, can not be powered off for a short time, and ensure the continuity and stability of power transmission.

Currently, flame-retardant cables generally utilize a fireproof material in the cable to perform a fireproof function, for example, a fireproof layer is arranged between an outer sheath and an armor layer, and when the outer sheath is ignited, the fireproof layer can limit flame to continuously spread inwards, so that the cable is prevented from burning rapidly. Obviously, in the cable, the fire-resistant effect of the fire-resistant layer arranged in the outer sheath on the outer sheath is not great, and the fire-resistant layer mainly plays a role when the outer sheath burns, so that the quick response of the fire-resistant layer is not facilitated, and meanwhile, the conventional flame-retardant cable is still to be reinforced in the aspects of compression resistance and torsion resistance.

Disclosure of utility model

The utility model aims to solve the technical problems that in the prior art, the fire resistance of the cable is poor, the compression resistance and the torsion resistance are to be enhanced, and based on the technical problems, the utility model provides a low-smoke halogen-free flame-retardant insulated cable.

The technical scheme includes that the low-smoke halogen-free flame-retardant insulated cable comprises a cable core unit, wherein a filling layer is arranged outside the cable core unit, an inner fireproof wrapping tape is wound outside the filling layer, an inner lining layer is arranged outside the inner fireproof wrapping tape, an armor layer is arranged outside the inner lining layer, an outer sheath is arranged outside the armor layer, a spiral groove is formed in the outer surface of the outer sheath, an outer fireproof wrapping tape is wound on the bottom wall of the spiral groove along the rotation direction of the spiral groove, and fireproof coatings are coated on the outer surface of the outer sheath except the bottom wall of the spiral groove.

Further, the groove width W of the spiral groove is one half of the pitch length P of the spiral groove.

Further, the inner fire-resistant strapping and the outer fire-resistant strapping are both made of fiberglass material.

Further, the fireproof coating is made of silicone fireproof paint or polyurethane fireproof paint or alkyd resin fireproof paint.

Further, the cable core unit comprises a conductor, a fire-resistant layer and an insulating layer, wherein the fire-resistant layer is arranged outside the conductor, and the insulating layer is arranged outside the fire-resistant layer.

Further, the filling layer is made of a silica gel material.

Further, the inner liner is made of PVC material.

Further, the armor layer is made of steel strips or wires.

Further, the outer sheath is made of polyvinyl chloride or polyethylene material.

The low-smoke halogen-free flame-retardant insulated cable has the beneficial effects that the inner fireproof wrapping tape and the outer fireproof wrapping tape can form a fireproof barrier, so that the fireproof effect is respectively achieved inside and outside the cable, the ignition of the cable is reduced as much as possible, the outer fireproof wrapping tape is arranged on the bottom wall of the groove of the spiral groove, the outer fireproof wrapping tape has a certain height difference on the outer surface of the outer sheath, the outer fireproof wrapping tape can be effectively prevented from being directly contacted with an external object, the outer fireproof wrapping tape is prevented from being easily damaged, meanwhile, the torsion resistance is enhanced, and in addition, the spiral groove can buffer partial pressure, and the damage of the cable caused by compression is reduced.

Drawings

The utility model is further described below with reference to the drawings and examples.

FIG. 1 is a front view of a low smoke, halogen-free, flame retardant insulated cable of the present utility model;

Fig. 2 is a cross-sectional view of the low smoke, halogen-free, flame retardant insulated cable of fig. 1 taken along A-A.

In the figure, 1, a cable core unit, 11, conductors, 12, a fire-resistant layer, 13, an insulating layer, 2, a filling layer, 3, an inner fire-resistant tape, 4, an inner liner, 5, an armor layer, 6, an outer sheath, 61, a spiral groove, 62, a fire-resistant coating, 7 and an outer fire-resistant tape.

Detailed Description

The present utility model will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the utility model only by way of illustration, and therefore it shows only the constitution related to the utility model.

Referring to fig. 1 and 2, the utility model provides a low smoke halogen-free flame retardant insulated cable, which comprises a cable core unit 1, wherein a filling layer 2 is arranged outside the cable core unit 1, an inner fireproof wrapping tape 3 is wound outside the filling layer 2, an inner liner 4 is arranged outside the inner fireproof wrapping tape 3, an armor layer 5 is arranged outside the inner liner 4, an outer sheath 6 is arranged outside the armor layer 5, a spiral groove 61 is formed on the outer surface of the outer sheath 6, an outer fireproof wrapping tape 7 is wound on the bottom wall of the spiral groove 61 along the rotation direction of the spiral groove 61, and fireproof coatings 62 are coated on the outer surface of the outer sheath 6 except the groove bottom wall of the spiral groove 61.

According to the low-smoke halogen-free flame-retardant insulated cable disclosed by the utility model, the inner fireproof wrapping tape 3 and the outer fireproof wrapping tape 7 can form a fireproof barrier, the inner fireproof wrapping tape 3 can effectively isolate flames from contacting with all layers outside the inner fireproof wrapping tape 3, and the outer fireproof wrapping tape 7 can effectively isolate flames from contacting with all layers inside the outer fireproof wrapping tape 7, so that ignition of the cable is reduced as much as possible. The fireproof coating 62 is coated on the surface of the outer sheath 6, so that flame propagation can be further prevented, and the time required for the outer sheath 6 to catch fire can be prolonged, so that the cable can continuously transmit power at high temperature.

In addition, the spiral groove 61 arranged on the outer surface of the outer sheath 6 can serve as a buffer chamber, and when the cable is deformed under pressure under the action of external force, the spiral groove 61 can buffer partial pressure, so that the damage of the cable caused by the pressure is reduced. In addition, the arrangement of the spiral groove 61 increases the outer surface area of the outer sheath 6, so that heat on the cable can be timely dissipated to the external atmosphere. Simultaneously, set up outer fire prevention band 7 on the groove diapire of helicla flute 61 for outer fire prevention band 7 has the surface of oversheath 6 to have certain difference in height, can effectively avoid outer fire prevention band 7 direct and foreign object contact, and then prevented outer fire prevention band 7 to damage easily. Further, the outer fireproof wrapping tape 7 is tightly spirally wound on the outer sheath 6, so that the cable can bear axial stress better, stability and durability of the cable are improved, torsion resistance of the cable is enhanced, and the situation that the cable is broken due to excessive torsion of the cable and the inner cable core unit 1 is avoided.

As a preferred embodiment, the groove width W of the spiral groove 61 is half of the pitch length P of the spiral groove 61, so that the effective winding area of the outer fire-proof wrapping tape 7 is ensured, the enough contact area with foreign objects is ensured on the outer surface of the outer sheath 6, the supporting effect is remarkable, and the protection effect is ensured. In addition, the outer fireproof wrapping tape 7 is spirally wrapped, so that the tape cutting treatment is not needed when each circle of wrapping tape is wrapped, the processing continuity can be realized, and the production efficiency is high.

In this embodiment, the inner fire-resistant tape 3 and the outer fire-resistant tape 7 are both made of a glass fiber material. It will be appreciated that in other embodiments, the inner and outer fire-resistant straps 3, 7 may also be made of a fire-resistant material such as silicone rubber or ethylene propylene diene monomer.

The material of the fire-resistant coating 62 may be selected from silicone fire-resistant paint or polyurethane fire-resistant paint or alkyd fire-resistant paint of the prior art.

The cable core unit 1 comprises a conductor 11, a fire-resistant layer 12 and an insulating layer 13, wherein the fire-resistant layer 12 is arranged outside the conductor 11, and the insulating layer 13 is arranged outside the fire-resistant layer 12. In this embodiment, the conductor 11 is a copper wire, and the refractory layer 12 is made of a low smoke halogen-free material to achieve a good refractory function. The insulating layer 13 is made of a silicone material. As a preferred embodiment, the core unit 1 has four and is uniformly distributed in the filler layer 2.

The filling layer 2 can provide supporting and filling functions for the cable internal structure, and the cable internal structure is protected from being pressed and worn, so that the normal service life ‌ of the cable is ensured. In this embodiment, the filling layer 2 is made of a silica gel material, and the silica gel has stable chemical properties, heat resistance and cold resistance, can effectively protect the cable core unit 1, and can buffer vibration and support load.

The inner liner 4 is used as a concentric layer between the filling layer 2 and the armor layer 5, and mainly plays a role in isolation, so that the armor layer 5 is prevented from damaging the filling layer 2 and the inner fireproof wrapping tape 3, and in the embodiment, the inner liner 5 is made of PVC material.

The armor layer 5 can prevent the cable from being subjected to external pressure and abrasion in the installation and use processes, so that the service life of the cable is prolonged, and in addition, the armor layer 5 also has a shielding effect, can reduce electromagnetic interference and ensures the working stability of the cable under a low-frequency environment. The armour layer 5 may be made of steel tape or wire.

The outer sheath 6 is used for preventing the cable from being damaged by physical, chemical and other factors in the use process, and ensuring the cable to have long-term stable and reliable transmission performance and safety performance. The outer sheath 6 may be made of polyvinyl chloride or polyethylene material.

While the foregoing is directed to the preferred embodiment of the present utility model, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (9)

1. A low-smoke halogen-free flame-retardant insulated cable, comprising a core unit, wherein a filling layer is provided on the outside of the core unit, characterized in that: an inner fireproof wrapping tape is wound around the outside of the filling layer, an inner lining layer is provided outside the inner fireproof wrapping tape, an armor layer is provided outside the inner lining layer, an outer sheath is provided outside the armor layer, a spiral groove is formed on the outer surface of the outer sheath, an outer fireproof wrapping tape is wound on the bottom wall of the spiral groove along the spiral direction of the spiral groove, and a fireproof coating is applied to the outer surface of the outer sheath except for the bottom wall of the spiral groove. 2. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: the width W of the spiral groove is half the pitch length P of the spiral groove. 3. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: both the inner fireproof wrapping tape and the outer fireproof wrapping tape are made of glass fiber material. 4. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: the material of the fire-retardant coating is a silicone fire-retardant coating, a polyurethane fire-retardant coating, or an alkyd resin fire-retardant coating. 5. The low-smoke halogen-free flame-retardant insulated cable according to any one of claims 1-4, characterized in that: the cable core unit includes a conductor, a fire-resistant layer and an insulation layer, wherein the fire-resistant layer is disposed outside the conductor and the insulation layer is disposed outside the fire-resistant layer. 6. The low-smoke halogen-free flame-retardant insulated cable according to any one of claims 1-4, characterized in that: the filler layer is made of silicone material. 7. The low-smoke halogen-free flame-retardant insulated cable according to any one of claims 1-4, characterized in that: the inner lining layer is made of PVC material. 8. The low-smoke halogen-free flame-retardant insulated cable according to any one of claims 1-4, characterized in that: the armor layer is made of steel strip or steel wire. 9. The low-smoke halogen-free flame-retardant insulated cable according to any one of claims 1-4, characterized in that: the outer sheath is made of polyvinyl chloride or polyethylene material.