CN209785595U

CN209785595U - Medium-voltage fireproof cable

Info

Publication number: CN209785595U
Application number: CN201920588787.6U
Authority: CN
Inventors: 王亭; 姜一鑫; 周俊; 王志军
Original assignee: Sinostar Cable Co Ltd
Current assignee: Sinostar Cable Co Ltd
Priority date: 2019-04-27
Filing date: 2019-04-27
Publication date: 2019-12-13
Anticipated expiration: 2029-04-27

Abstract

The utility model relates to a middling pressure fireproof cable, it includes the conductor outside is equipped with the conductor shield layer outside is equipped with the insulating layer outside is equipped with the insulation shield layer outside is equipped with the copper strips shielding layer, is equipped with fire-retardant PP rope in the line core outside fire-retardant PP rope outside is equipped with low smoke and zero halogen high flame retardant belt, ceramic fire-resistant polyolefin insulating layer, high fire-retardant glass fiber tape I, low smoke and zero halogen high flame retardant oxygen barrier layer, high fire-retardant glass fiber tape II, steel band fire blocking layer, high fire-retardant glass fiber tape III and low smoke and zero halogen fire-retardant polyolefin oversheath in proper order. The utility model discloses possess and do not have characteristics such as steamed, low cigarette, fire-retardant A level, fire-resistant A level, resistant high low temperature.

Description

Medium-voltage fireproof cable

Technical Field

The utility model relates to a cable, concretely relates to fireproof cable.

Background

In recent years, cable fire accidents frequently occur, due to the fact that fire prevention measures are incomplete, the cable is spread quickly after the cable is ignited, the fire is fierce, the cable is difficult to extinguish, a large amount of cables and equipment are directly burnt, the time for power failure repair is long, and industrial and agricultural production and electricity utilization of people in life are seriously affected. According to statistics of relevant departments, direct and indirect losses are huge in multiple cable fire accidents occurring in China.

According to related statistics, the fire caused by the cable is not a main proportion of the total number of the fire accidents of the cable, and the external reasons of the cable are various and are not sufficient for defense. In the most recent domestic cable fire accidents investigated in China, the total number of the delayed combustion accounts for about 25% of the total number of the cable fires caused by the faults of the cables, and the delayed combustion accounts for about 75% of the total number of the cable fires caused by external fire sources, so that the spread of the cable fire should be reduced or prevented.

At present, medium-voltage cables gradually replace low-voltage cables to be applied to buildings in places with concentrated population and the like, and development of medium-voltage fireproof cables meeting market demands is not slow.

Disclosure of Invention

The purpose of the invention is as follows: the utility model aims at overcoming the not enough among the prior art, provide a middling pressure fireproof cable who possesses characteristics such as no halogen, low cigarette, fire-retardant A level, fire-resistant A level, resistant high low temperature.

The technical scheme is as follows: in order to solve the technical problem, the utility model provides a medium voltage fireproof cable, it includes the conductor, be equipped with the conductor shielding layer outside the conductor, be equipped with the XLPE insulating layer outside the conductor shielding layer, be equipped with the insulating shield outside the XLPE insulating layer, conductor shielding layer, XLPE insulating layer and insulating shield adopt dry process crosslinked three-layer coextrusion to form, be equipped with the copper strips shielding layer outside the insulating shield, they constitute the sinle silk, a plurality of sinle silks are tangent to be set up, be equipped with fire-retardant PP rope outside the sinle silk, be equipped with low smoke and zero halogen high fire-retardant area around the package outside the fire-retardant PP rope, be equipped with ceramic fire-retardant polyolefin insulating layer outside the low smoke and zero halogen high fire-retardant area, be equipped with high fire-retardant glass fiber tape I outside the ceramic fire-retardant polyolefin insulating layer, be equipped with low smoke and zero halogen high fire-retardant oxygen, low smoke and zero halogen high flame retardant separates oxygen layer outside and is equipped with high flame retardant glass fiber tape II outside of high flame retardant glass fiber tape is equipped with steel band fire blocking layer the steel band fire blocking layer outside is equipped with high flame retardant glass fiber tape III the III outside of high flame retardant glass fiber tape is equipped with low smoke and zero halogen flame retardant polyolefin oversheath.

The conductor is a round compacted copper conductor.

The cross-sectional area of the conductor is 25-500mm²The geometrical shape of the copper wire is circular, the copper wire is formed by concentrically twisting a plurality of soft round copper wires with the same diameter, and the twisting directions of adjacent twisting layers are opposite.

The number of the wire cores is one.

The number of the wire cores is three, and the wire cores are arranged in an externally-tangent mode.

The conductor shielding layer is a semi-conductive conductor shielding layer.

The insulation shielding layer is a semi-conductive insulation shielding layer.

The utility model discloses an overall structure divide into conductive core, insulating (including conductor shielding and insulation shield), metallic shield, high fire-retardant filling layer, around covering, insulating layer, high fire-retardant isolation layer, high fire-retardant oxygen barrier layer, armor fire blocking layer, high fire-retardant isolation layer and outer jacket. The processing range is monofilament drawing, conductor transposition, insulating extrusion (insulating, inside and outside shielding three-layer coextrusion), metallic shield, high fire-retardant filling layer, around the covering, crowded package insulating layer, around package high fire-retardant isolation layer, crowded package high fire-retardant oxygen barrier layer, around package armor fire stopping layer, around package high fire-retardant isolation layer and outer jacket extrusion.

The product adopts high-quality copper material as conductor material, so that the conductivity and normal use temperature of the conductor are improved; the high-performance crosslinked polyethylene insulation is adopted, so that the mechanical property and the electrical property of the cable are improved; the ceramic fire-resistant polyolefin sheath is wrapped by a low-smoke halogen-free high-flame-retardant belt, a glass fiber belt and a high-flame-retardant oxygen-isolating layer sheath, so that good flame-retardant performance is ensured; the cable has excellent comprehensive fireproof performance.

Has the advantages that: compared with the prior art, the utility model, it is showing the advantage and is: the utility model has reasonable overall structure, adopts the ceramic fire-resistant polyolefin thermal insulation layer, can rapidly generate a complete ceramic shell under the temperature or flame condition of more than 650 ℃, has excellent oxygen-insulating and thermal-insulating effects, can effectively isolate the infringement of high-temperature flame to the inside of the circuit, delays the decomposition of internal materials, avoids the fusing of conductors in the flame, ensures the smoothness of the circuit under the fire disaster condition, adopts the low-smoke halogen-free high-flame-retardant oxygen-insulating layer to effectively prevent the spreading of the flame, adopts the steel band fire-blocking layer to block the external flame, delays the damage of the inside of the circuit, continues the normal service time of the circuit, the low-smoke halogen-free flame-retardant polyolefin outer sheath can adapt to different environmental requirements, the insulating wire core can be a single core or a three-core, has fixed geometric shape, high stability, has little influence on the curvedness of the cable, the fireproof flame-retardant polyethylene cable is formed by three layers of coextrusion, wherein the inner layer is a semiconductive conductor shielding layer, the outer layer is a semiconductive insulation shielding layer, the middle layer is a crosslinked polyethylene insulation layer, the three layers are formed by extrusion of high-quality materials, and the linear molecular structure of polyethylene is converted into a three-dimensional reticular molecular structure through crosslinking special treatment, so that the electrical performance, the physical performance, the mechanical performance and other special performances of the product are greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in figure 1, the utility model provides a medium voltage fireproof cable, it includes conductor 1, it is circular sticising copper conductor, its sectional area is 25-500mm²Its geometry is circular, and it is formed by the concentric system of twisting of the soft round copper wire that a plurality of diameters are the same, and the transposition opposite direction of adjacent hank layer conductor 1 outside is equipped with conductor shield 2, and it is semiconduction conductor shielding layer conductor shield 2 outside is equipped with XLPE insulating layer 3 outside is equipped with insulation shield 4, and it is semiconduction insulation shield, conductor shield 2, XLPE insulating layer 3 and insulation shield 4 adopt dry process crosslinked three-layer to crowd and form, insulation shield 4 outside is equipped with copper strips shielding layer 5, and they constitute the sinle silk, and three sinle silk is circumscribed each other and sets up the sinle silk outside is equipped with fire-retardant PP rope 6 outside is equipped with low smoke and zero halogen high flame retardant area 7 around the package low smoke and zero halogen high flame retardant area 7 outside is equipped with pottery fire-resistant polyolefin insulating layer 8, ceramic fire-resistant polyolefin insulating layer 8 outside is equipped with high fire-retardant glass fiber tape I9 outside is equipped with low smoke and zero halogen high fire-retardant oxygen layer 10 outside is equipped with high fire-retardant glass fiber tape II 11 outside is equipped with steel band fire-blocking layer 12 outside is equipped with high fire-retardant glass fiber tape III 13 outside is equipped with low smoke and zero halogen fire-retardant polyolefin oversheath 14. The utility model has reasonable overall structure, adopts the ceramic fire-resistant polyolefin thermal insulation layer, can rapidly generate a complete ceramic shell under the temperature or flame condition of more than 650 ℃, has excellent oxygen-insulating and thermal-insulating effects, can effectively isolate the invasion of high-temperature flame to the interior of the circuit, delays the decomposition of internal materials, avoids the fusing of conductors in flame, ensures the smoothness of the circuit under the fire disaster condition, adopts the low-smoke halogen-free high-flame-retardant oxygen-insulating layer to effectively prevent the spreading of flame, adopts the steel band fire-blocking layer to block the external flame, delays the damage of the interior of the circuit, continues the normal service time of the circuit, the low-smoke halogen-free flame-retardant polyolefin outer sheath can adapt to different environmental requirements, the insulating wire core adopts three cores,The novel cable has the advantages that the geometric shape is fixed, the stability is high, the influence on the curvature of the cable is small, the insulating layer is composed of three layers, the three layers are formed by three-layer co-extrusion, the inner layer is a semi-conductive conductor shielding layer, the outer layer is a semi-conductive insulating shielding layer, the middle layer is a cross-linked polyethylene insulating layer, the three layers are formed by extrusion of high-quality materials, the linear molecular structure of polyethylene is converted into a three-dimensional net-shaped molecular structure through cross-linking special treatment, the electrical performance, the physical performance, the mechanical performance and other special performances of the product are greatly improved, the product meets the requirements of A-type flame retardance and fire resistance, the light transmittance of smoke generated when the product is burnt in a fire disaster and the pH value of escaping gas meet the standard requirements.

The utility model provides a thinking and method, the method and the way of specifically realizing this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary technical personnel in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also be regarded as the utility model discloses a protection range, each component that does not make clear and definite in this embodiment all can be realized with prior art.

Claims

1. A medium voltage fireproof cable is characterized in that: it includes conductor (1) outside is equipped with conductor shielding layer (2) outside is equipped with XLPE insulating layer (3) outside is equipped with insulating shielding layer (4), conductor shielding layer (2), XLPE insulating layer (3) and insulating shielding layer (4) adopt dry process cross-linking three-layer to crowd altogether and form insulation shielding layer (4) outside is equipped with copper strips shielding layer (5), and they constitute the sinle silk, and a plurality of sinle silks are tangent to be set up the sinle silk outside is equipped with fire-retardant PP rope (6) outside is equipped with low smoke and zero halogen high flame retardant area (7) around the package low smoke and zero halogen high flame retardant area (7) outside is equipped with pottery fire-resistant polyolefin insulating layer (8) outside is equipped with fire-retardant glass fiber area I (9), high fire-retardant glass fiber tape I (9) outside is equipped with low smoke and zero halogen high flame retardant oxygen layer (10) outside is equipped with high fire-retardant glass fiber tape II (11) outside is equipped with steel band fire-retardant layer (12) outside is equipped with high fire-retardant glass fiber tape III (13) outside is equipped with low smoke and zero halogen fire-retardant polyolefin oversheath (14).

2. The medium voltage fire cable according to claim 1, characterized in that: the conductor (1) is a round compacted copper conductor.

3. The medium voltage fire cable according to claim 1, characterized in that: the cross section area of the conductor (1) is 25-500mm²The geometrical shape of the copper wire is circular, the copper wire is formed by concentrically twisting a plurality of soft round copper wires with the same diameter, and the twisting directions of adjacent twisting layers are opposite.

4. The medium voltage fire cable according to claim 1, characterized in that: the number of the wire cores is one.

5. The medium voltage fire cable according to claim 1, characterized in that: the number of the wire cores is three, and the wire cores are arranged in an externally-tangent mode.

6. The medium voltage fire cable according to claim 1, characterized in that: the conductor shielding layer (2) is a semi-conductive conductor shielding layer.

7. the medium voltage fire cable according to claim 1, characterized in that: the insulation shielding layer (4) is a semi-conductive insulation shielding layer.