CN212380172U

CN212380172U - Tensile fire-resistant armored cable

Info

Publication number: CN212380172U
Application number: CN202020765842.7U
Authority: CN
Inventors: 张润浩; 黄伟立; 李金堂; 王玲红; 梁增显; 孟益标
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2021-01-19
Anticipated expiration: 2030-05-11

Abstract

The utility model discloses a fire-resistant armoured cable of tensile, include: the armored outer protection layer sequentially comprises a flame-retardant fire-resistant layer, an armor layer and a flame-retardant fire-resistant layer from outside to inside, and protects the whole cable; the conductive unit is positioned inside the armored outer protective layer and is wrapped by the armored outer protective layer to provide a conductive function; the hoisting unit is positioned inside the armored outer protective layer and is wrapped by the armored outer protective layer for tensile strength; and the filling layer is used for filling the armored outer protective layer, the conductive unit and the hoisting unit and gaps among the armored outer protective layer, the conductive unit and the hoisting unit. The utility model discloses an armoured cable accords with the requirement that the direct-burried laid, when having good fire resistance, has added the hoist and mount unit for the tensile strength of cable has obtained showing the promotion, is applicable to high-rise building's vertical hoisting.

Description

Tensile fire-resistant armored cable

Technical Field

The utility model relates to an armoured cable especially relates to a fire-resistant armoured cable of tensile.

Background

Along with the high-speed development of urbanization in China and the high progress of building technology, high-rise buildings become the indispensable building types of society, symbolize the civilization degree of cities, and many buildings break through the height of 200 meters. However, as the number of floors increases, the building volume rate, the power consumption and the transmission power increase, and the demand for large-capacity cables is higher and higher. The capacity and weight of the cable are continuously increased, the weight of the cable is usually more than 5 tons, and the trunk cable in a high-rise building is vertically laid, so that the cable is required to have high tensile strength.

At present, the traditional tensile cable generally adopts a steel wire armored copper core cable, and although the tensile property of the cable is increased to a certain extent, the cable is difficult to fix and install due to a plurality of steel wires, and further development of high-rise buildings is restricted to a certain extent. On the other hand, the fire evacuation difficulty of the high-rise building is determined by the characteristics of the high-rise building, and once a fire occurs, huge life and property losses are easily caused, so that the fire prevention measures of the high-rise building are very strict, and a high requirement is put on the fire resistance of the cable. In order to satisfy the needs of domestic urbanization development, enlarge company product market, my company decides to design development light in weight, be convenient for the high-rise building vertical hoisting of installation and use the fire-resistant armoured cable of middling pressure to vertical hoisting direct-burried laying in being applied to high-rise buildings such as financial center, trade and business building, realizes 35kV and following power energy transmission, the utility model discloses suitable voltage rating is 8.7/15 kV.

The fire-resistant cable in the prior art has unsatisfactory tensile property.

For example, a "fire resistant cable and a cable assembly including the same" disclosed in chinese patent document, publication No. CN205789231U, includes a plurality of cable insulation cores, a plurality of cooling pipes, a water blocking tape, a filler, and an outer layer.

The utility model discloses a cooling tube has further promoted the fire resistance of cable in conventional cable, but when this cable was applied to high-rise building, can lead to cable structure to warp because tensile strength is not enough, the cracked problem of outer distortion.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the not enough problem of prior art's tensile strength, provide a fire-resistant armoured cable of tensile, improve the tensile strength of cable, be applicable to high-rise building's vertical hoisting direct-burried and lay.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a tensile, fire-resistant armored cable comprising:

the armored outer protection layer sequentially comprises a flame-retardant fire-resistant layer, an armor layer and a flame-retardant fire-resistant layer from outside to inside, and protects the whole cable;

the conductive unit is positioned inside the armored outer protective layer and is wrapped by the armored outer protective layer to provide a conductive function;

the hoisting unit is positioned inside the armored outer protective layer and is wrapped by the armored outer protective layer for tensile strength;

and the filling layer is used for filling the armored outer protective layer, the conductive unit and the hoisting unit and gaps among the armored outer protective layer, the conductive unit and the hoisting unit.

An independent hoisting unit is additionally arranged in the cable and made of materials with good tensile property, and the hoisting unit can be directly used as a hoisting carrier to bear the integral weight of the cable in the vertical hoisting direct-buried laying process. After the direct-buried laying is finished, in the use process in the future, the hoisting unit continues to be used as the integral bearing carrier of the cable, and the cable is prevented from deforming or being damaged due to dead weight.

Preferably, the number of the hoisting units is three, and the hoisting units are arranged in a delta shape inside the armor outer sheath.

The three hoisting units are arranged in a shape like a Chinese character 'pin', and are uniform in bearing and stable in structure.

Preferably, the hoisting unit is made of stranded steel wires.

The steel wire is used as a common building material, has the characteristics of high tensile strength and low cost, and is suitable for the requirement of the utility model on the material.

Preferably, the outermost layer of the armor outer protection layer is a low-smoke halogen-free flame-retardant polyolefin layer, the secondary outer layers are a ceramic fireproof fire-resistant oxygen-insulating layer and a fire-resistant belt layer, the third layer is a steel belt armor layer, the fourth layer is a fire-resistant belt layer, the fifth layer is a ceramic fireproof fire-resistant oxygen-insulating layer, and the sixth layer is a fire-resistant belt layer.

After a fire disaster occurs, the cable is in a high-temperature environment, and the outermost layer is firstly flushed and exposed to the high-temperature environment. The outermost layer of the armor outer protective layer is a low-smoke halogen-free flame-retardant polyolefin layer, so that flame can be prevented from being extinguished by itself after a local cable is on fire, and the cable cannot be spread along the cable. The low smoke and zero halogen characteristics can also prevent secondary damage caused by toxic and harmful gases generated by combustion. The secondary outer layer is a ceramic fireproof fire-resistant oxygen-insulating layer and is made of a fire-resistant material, and the secondary outer layer can bear high temperature without being damaged under the condition that the outermost layer of the low-smoke halogen-free flame-retardant polyolefin layer is damaged, so that the internal structure of the cable is protected. The third layer is a steel tape armor layer, can improve the mechanical strength of the cable, and has certain tensile property. The fourth, fifth and sixth layers are all made of refractory materials, and the multiple layers are compounded, so that the cable armor outer protective layer has high fire resistance.

Preferably, the refractory band layer is a mica tape.

The mica tape has excellent high temperature resistance and combustion resistance, and is applied as a refractory material to the utility model discloses it is suitable.

Preferably, the outermost layer of the conductive unit is a copper strip shielding layer, the secondary outer layer is a semiconductive buffering water blocking tape layer, the third layer is an insulating shielding layer, the fourth layer is an insulating layer, the fifth layer is a conductor shielding layer, and the sixth layer is a stranded conductor.

Because the utility model discloses an application scene is 8.7/15 kV's rated voltage, and consequently the electric field of electrically conductive unit is releived and shielding function requires highlyr, and the outer exterior structure who contains metallic impurity can not damage under the electric field effect because the strong electric field that the high pressure arouses in can the shielded wire on outermost copper strips shielding layer. The semi-conductive buffering water-blocking tape layer on the secondary outer layer can effectively prevent the water tree effect which causes the cable damage. The third and fifth layers play a role of relieving the electric field filled gap and preventing the breakdown damage of the insulator caused by the gap between the conductor and the insulating layer.

Preferably, the conductive elements are three and arranged in a delta shape.

The three conductive units are arranged in a delta shape and are suitable for three-phase power transmission.

Therefore, the utility model discloses following beneficial effect has: (1) the tensile property is good; (2) the fire resistance is good.

Drawings

Fig. 1 is a schematic cross-sectional structure of the present invention.

In the figure: 1. the cable comprises a stranded conductor 2, a conductor shielding layer 3, insulation 4, an insulation shielding layer 5, a semi-conductive buffering water-blocking tape layer 6, a copper strip shielding layer 7, a hoisting unit 8, a fire-resistant tape layer 9, a ceramic fireproof oxygen-insulating layer 10, a steel strip armor layer 11, a low-smoke halogen-free flame-retardant polyolefin layer 12, a filling layer 13, a conductive unit 14 and an armor outer protection layer.

Detailed Description

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

Example 1: as shown in fig. 1, a tensile fire-resistant armored cable includes:

the armor outer protective layer 14 comprises a flame-retardant fire-resistant layer, an armor layer and a flame-retardant fire-resistant layer from outside to inside in sequence, and protects the whole cable;

the conductive unit 13 is positioned inside the armored outer protective layer 14 and is wrapped by the armored outer protective layer 14 to provide a conductive function;

the hoisting unit 7 is positioned inside the armored outer protective layer 14 and is wrapped by the armored outer protective layer 14 to provide tensile strength;

and the filling layer 12 is used for filling gaps among the armor outer sheath 14, the conductive unit 13 and the hoisting unit 7.

Due to the adoption of the hoisting unit 7, the dead weight of the cable is borne by the hoisting unit under the condition of vertical laying, so that the use requirement of vertical laying on a high-rise building can be met by selecting a material with good tensile resistance for the hoisting unit 7.

Furthermore, there are three hoisting units 7 arranged in a delta shape inside the armor outer sheath.

The three hoisting units 7 are arranged in a shape like a Chinese character 'pin', and are uniform in bearing and stable in structure.

Further, the hoist unit 7 is made of stranded steel wires.

Further, the outermost layer of the armor outer protection layer 14 is a low-smoke halogen-free flame-retardant polyolefin layer 11, the second outer layer is a ceramic fireproof fire-resistant oxygen-insulating layer 9, the third layer is a steel belt armor layer 10, the fourth layer is a fire-resistant belt layer 8, the fifth layer is a ceramic fireproof fire-resistant oxygen-insulating layer 9, and the sixth layer is a fire-resistant belt layer 8.

After a fire disaster occurs, the cable is in a high-temperature environment, and the outermost layer is firstly flushed and exposed to the high-temperature environment. The outermost layer of the armor outer protection layer 14 is a low-smoke halogen-free flame-retardant polyolefin layer 11, so that after a local cable is on fire, flame can be automatically extinguished, and the cable cannot spread along the cable. The low smoke and zero halogen characteristics can also prevent secondary damage caused by toxic and harmful gases generated by combustion. The secondary outer layer is a ceramic fireproof oxygen-insulating layer 9 and is made of a fireproof material, and the secondary outer layer can bear high temperature without being damaged under the condition that the outermost layer of the low-smoke halogen-free flame-retardant polyolefin layer 11 is damaged, so that the internal structure of the cable is protected. The third layer is a steel tape armor layer 10, which can improve the mechanical strength of the cable and meet the requirements of vertical hoisting and direct burial laying in high-rise buildings. The fourth, fifth and sixth layers are all made of fire-resistant materials, and are compounded in multiple layers, so that the cable armor outer protective layer 14 has high fire resistance.

Further, the refractory band layer 8 is a mica tape.

Furthermore, the outermost layer of the conductive unit is a copper strip shielding layer 6, the secondary outer layer is a semiconductive buffering water blocking tape layer 5, the third layer is an insulating shielding layer 4, the fourth layer is an insulating layer 3, the fifth layer is a conductor shielding layer 2, and the sixth layer is a stranded conductor 1.

Further, the conductive units 13 are three and arranged in a delta shape.

The three conductive units 13 are arranged in a delta shape and are suitable for three-phase power transmission.

Claims

1. The utility model provides a fire-resistant armoured cable of tensile, characterized by includes:

the armor outer protective layer is sequentially provided with a flame-retardant fire-resistant layer, an armor layer and a flame-retardant fire-resistant layer from outside to inside, and the whole cable is protected;

the hoisting unit is positioned inside the armored outer protective layer and is wrapped by the armored outer protective layer to provide tensile strength;

and the filling layer is used for filling gaps among the armor outer protective layer, the conductive unit and the hoisting unit.

2. A fire-resistant and tensile armored cable according to claim 1, wherein there are three of said hoisting units, which are arranged in a delta shape inside the armor outer sheath.

3. A tensile and fire-resistant armored cable according to claim 2, wherein the hoisting units are made of stranded steel wires.

4. A tensile fire-resistant armored cable according to claim 1, 2 or 3, wherein the outermost layer of the armor outer sheath is a low-smoke halogen-free fire-resistant polyolefin layer, the second outer layer is a ceramic fire-resistant oxygen-insulating layer, the third layer is a steel tape armor layer, the fourth layer is a fire-resistant tape layer, the fifth layer is a ceramic fire-resistant oxygen-insulating layer, and the sixth layer is a fire-resistant tape layer.

5. A tensile and fire-resistant armored cable according to claim 4, wherein the fire-resistant tape layer is a mica tape.

6. A tensile and fire-resistant armored cable according to claim 1, 2 or 3, wherein the outermost layer of the conductive elements is a copper tape shield, the second outer layer is a semiconductive buffer water-blocking tape layer, the third layer is an insulation shield, the fourth layer is an insulation layer, the fifth layer is a conductor shield, and the sixth layer is a stranded conductor.

7. A tensile and fire-resistant armoured cable according to claim 6 in which there are three conductive elements arranged in a delta configuration.