CN217113925U - Flexible insulated cable - Google Patents
Flexible insulated cable Download PDFInfo
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- CN217113925U CN217113925U CN202220452080.4U CN202220452080U CN217113925U CN 217113925 U CN217113925 U CN 217113925U CN 202220452080 U CN202220452080 U CN 202220452080U CN 217113925 U CN217113925 U CN 217113925U
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Abstract
The present disclosure relates to a flexible insulated cable, the cable comprising: the cable comprises a sheath and a cable core sleeved in the sheath; the core comprises: the conductor is a tin-plated copper conductor; the insulating layer covers the outer layer of the conductor, and is a calcined mica tape; the insulating layer is wrapped on the outer layer of the insulating layer, and the wrapping layer is a glass fiber tape. The flexible insulated cable disclosed by the invention adopts a tinned copper conductor, so that copper can be prevented from being oxidized in a high-temperature environment; the calcined mica tape is used as an insulating layer material, so that the fire-resistant temperature grade of the cable can be greatly improved, and the fluorine content can be reduced.
Description
Technical Field
The disclosure relates to the technical field of cables, in particular to a flexible insulated cable.
Background
According to the requirements of GB/T19666, the carbonization range of a burning sample of a common flame-retardant cable under a certain condition does not exceed 2.5m above the bottom edge of a blast lamp, and a fuse and an indicator lamp are not extinguished under the condition that the cable bears 750 ℃ flame to burn for 90 min. With the high-speed development of economy in China, the safety of public places is more and more important, the cable is more and more important as an important element of public buildings, and the requirements on flame retardance and fire resistance of the cable are more and more high.
In the aspect of flame retardant performance, as the national standard GB51348-2019 'civil building electrical design standard' is released and implemented, public buildings with the building height of more than 100m are required, wires and cables with the combustion performance of B1 grade and above, the smoke-generating toxicity of t0 grade and the combustion drippage/particle grade of d0 grade are selected; the wires and cables laid on the refuge layer (between the refuge layers) are selected from the wires and cables with the combustion performance not lower than B1 grade, the smoke generating toxicity of t0 grade and the combustion drop/particle grade of d0 grade. According to the regulation of GB31247-2014, the cable with the grade A of combustion performance is a non-combustible cable, and the total heat value PCS generated by the cable under flame is less than or equal to 2.0 MJ/kg. In the aspect of fire resistance, European standards BS6387 and BS8491 stipulate that cables must meet the requirements of 950 ℃ flame combustion for 180min, and increase mechanical impact and continuous fuse and non-extinguishment of indicator lamps under the condition of water spraying.
The existing fire-resistant flame-retardant cable mainly comprises a rigid mineral insulated cable (hereinafter referred to as a rigid cable) and a flexible mineral insulated cable (hereinafter referred to as a flexible cable), wherein the rigid cable is a typical A-grade flame-retardant cable which does not contain any combustible material due to the fact that inorganic mineral magnesium oxide is used as an insulating material and metal copper is used as a sheath, but has the defects of high processing difficulty, high production cost, high hardness, large bending radius and difficulty in laying. The mica tape is used as an insulating material for the flexible cable, and the flexible cable is simple in processing technology, good in flexibility and convenient to lay and install. The mica paper in the mica tape is a key component for maintaining the insulation of the cable under the condition of flame, so the heat resistance level of the mica paper determines the temperature resistance grade of the mica tape. At present, muscovite, phlogopite and synthetic mica are used in the mica tape, and the phlogopite and the muscovite tape are widely applied to B-grade fire-resistant cables by the characteristics of moderate price and low cost, but are limited by temperature resistance (the phlogopite releases crystal water at 800 ℃, and the muscovite releases crystal water at 600 ℃), and cannot meet the requirements of BS6387 and BS8491 on fire resistance; although the synthetic mica tape can meet the fire-resistant requirement, the synthetic mica tape is high in hardness and poor in flexibility, is easy to peel off in a wrapping process and is not suitable for processing of small-section cables, and on the other hand, the synthetic mica tape contains fluorine elements and can release toxic and harmful gases during combustion, so that the synthetic mica tape is limited by various environmental protection instructions, and the popularization and application of the synthetic mica tape in the industry at present are very limited. In addition, because the mica tape contains a large amount of binder, a large amount of heat is released during combustion, so that the cable cannot meet the requirement of class A flame retardant property in GB 31247.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the present disclosure aims to provide a flexible insulated cable. The flexible insulated cable disclosed by the invention adopts a tinned copper conductor, so that copper can be prevented from being oxidized in a high-temperature environment; the calcined mica tape is used as an insulating layer material, so that the fire-resistant temperature grade of the cable can be greatly improved, and the fluorine content can be reduced.
The flexible insulated cable of this disclosure, include:
the cable comprises a sheath and a cable core sleeved in the sheath;
the core comprises:
the conductor is a tin-plated copper conductor;
the insulating layer covers the outer layer of the conductor, and is a calcined mica tape;
the wrapping layer is coated on the outer layer of the insulating layer and is a glass fiber tape.
Preferably, in the insulating layer, the number of the calcined mica tapes is 4-8.
Preferably, the thickness of the calcined mica tape is 0.2mm to 0.6 mm.
Preferably, in the wrapping layer, the number of the glass fiber tapes is 1-3.
Preferably, the thickness of the glass fiber tape is 0.5mm to 0.8 mm.
Preferably, the conductor is a solid core structure or a stranded compacted structure.
The utility model discloses a flexible insulated cable, its advantage lies in:
1. the conductor disclosed by the invention is a tin-plated copper conductor, so that copper can be effectively prevented from being oxidized in a high-temperature environment, the conductor can keep good conductivity in the high-temperature environment, and the fire-resistant and high-temperature-resistant performance of the cable is improved;
2. the calcined mica tape is used as an insulating layer material, and the separation temperature of crystal water of the calcined mica tape is high, so that the fire resistance of the cable can be improved, and the fire resistance grade requirement of the cable can be met; the flexible cable is good in flexibility, is not easy to fall off in the wrapping process, and can be suitable for the processing process of small-section cables; on the other hand, the content of fluorine element in the calcined mica tape is low, so that toxic and harmful gas released during combustion can be reduced, and the mica tape is more environment-friendly.
Drawings
Fig. 1 is a schematic structural diagram of a flexible insulated cable according to embodiment 1 of the present disclosure;
fig. 2 is a schematic structural diagram of a flexible insulated cable according to embodiment 2 of the present disclosure.
Description of reference numerals: 1-sheath, 2-wire core, 21-conductor, 22-insulating layer and 23-wrapping layer.
Detailed Description
As shown in fig. 1, a flexible insulated cable according to the present disclosure includes:
sheath 1 and the cover establish sinle silk 2 in sheath 1, and sheath 1 is the copper sheath usually for the cladding is in the outside of sinle silk 2, in order to play wear-resisting, protection sinle silk 2's effect.
Sinle silk 2 is multilayer cladding structure, and sinle silk 2 specifically includes:
the conductor 21 and the conductor 21 are tin-plated copper conductors, and the tin-plated copper materials have good high temperature resistance and oxidation resistance, so that the conductor 21 can be prevented from being oxidized in the subsequent high-temperature sintering process, and the tin-plated copper conductors can keep good conductivity. The conductor 21 is typically of a solid core construction or a stranded compacted construction, with a solid core construction being used for smaller diameter cables having a smaller cross-sectional area and a stranded compacted construction being used for larger diameter cables having a larger cross-sectional area.
The insulation layer 22, the insulation layer 22 is coated on the outer layer of the conductor 21, the insulation layer 22 is a calcined mica tape, the calcined mica tape is generally formed by bonding calcined mica paper as a substrate, alkali-free glass fiber cloth as a reinforcing material and organic silica gel as an adhesive, and the organic silica gel is an adhesive with a main component and can release more heat during combustion to influence the overall flame retardant property of the cable. However, the calcined mica tape has the characteristics of high temperature resistance and low fluorine content.
Around covering 23, around covering 23 cladding in the skin of insulating layer 22, around covering 23 for the glass fiber area. The glass fiber tape has the advantages of good insulation, strong heat resistance, good corrosion resistance and high mechanical strength, can further enhance the insulation and the heat resistance of the cable, and simultaneously has the advantages of good corrosion resistance, high tensile strength and long service life.
The flexible insulated cable of the present disclosure has at least the following two embodiments for the single-wire core structure and the multi-wire core structure common to cables.
Example 1
Referring to fig. 1 in detail, fig. 1 shows a flexible insulated cable with a single-wire core structure, wherein a single wire core 2 is arranged in a sheath 1, the single wire core 2 includes a conductor 21, an insulating layer 22 and a wrapping layer 23 which are sequentially arranged from inside to outside, and the sheath 1 is tightly attached to the outside of the wrapping layer 23 to form the flexible insulated cable with the single-wire core structure.
Example 2
Referring to fig. 2 in detail, fig. 2 shows a flexible insulated cable with a multi-core structure, wherein a plurality of cores 2 are arranged in a sheath 1, as shown in fig. 2, three cores 2 are included, each core 2 includes a conductor 21, an insulating layer 22 and a wrapping layer 23, the conductors 21, the insulating layer 22 and the wrapping layer 23 are sequentially arranged from inside to outside, the three cores 2 are circumferentially distributed around a central point at equal intervals, a wrapping layer 23 is further wrapped on the outer side of each core 2, the wrapping layer 23 is also a glass fiber tape, the three cores 2 are wrapped into a whole, the sheath 1 is wrapped outside the wrapping layer 23, and the flexible insulated cable with the multi-core structure is formed.
The flexible insulated cable of the present disclosure has the following advantages:
the conductor 21 is a tin-plated copper conductor, so that copper can be effectively prevented from being oxidized in a high-temperature environment, the conductor 21 can keep good conductivity in the high-temperature environment, and the fire resistance and high-temperature resistance of the cable are improved;
according to the method, the calcined mica tape is used as the material of the insulating layer 22, the separation temperature of crystal water of the calcined mica tape is high, the fire resistance of the cable can be improved, and the requirement of the fire resistance grade of the cable can be met; the flexible cable is good in flexibility, is not easy to fall off in the wrapping process, and can be suitable for the processing process of small-section cables; on the other hand, the content of fluorine element in the calcined mica tape is low, so that toxic and harmful gas released during combustion can be reduced, and the mica tape is more environment-friendly.
Furthermore, in the embodiment, the number of the burning mica tapes in the insulating layer 22 is 4-8, more specifically, the thickness of the burning mica tapes is 0.2 mm-0.6 mm, and the burning mica tape structure can play a good insulating and fireproof role, and simultaneously the insulating layer 22 is moderate in thickness and convenient to wrap.
Furthermore, in this embodiment, in the wrapping layer 23, the number of layers of the glass fiber tape is 1-3, more specifically, the thickness of the glass fiber tape is 0.5 mm-0.8 mm, and the glass fiber tape structure described above enables the wrapping layer 23 to have good insulation, heat resistance, corrosion resistance and tensile strength, and simultaneously enables the thickness of the wrapping layer 23 to be moderate, thereby facilitating the wrapping.
The embodiment of the disclosure also provides a preparation method of the flexible insulated cable, which is used for preparing the flexible insulated cable, and comprises the following steps:
forming the conductor 21: drawing a copper rod raw material by a drawing machine, then plating tin on the surface of a copper wire by an electroplating machine, and stranding by a stranding machine to obtain a tin-plated copper conductor;
insulating wrapping: coating a plurality of layers of calcined mica tapes on the outer layer of the tinned copper conductor to form an insulating layer 22, and then coating a plurality of layers of glass fiber tapes on the outer layer of the insulating layer 22 to form a wrapping layer 23, so that the tinned copper conductor is coated with a plurality of layers of calcined mica tapes and a plurality of layers of glass fiber tapes from inside to outside; the conductor 21, the insulating layer 22 and the wrapping layer 23 form a wire core 2;
and (3) sintering: sintering the obtained wire core 2 at high temperature to densify the adhesive in the calcined mica tape so as to reduce the heat release during combustion;
welding the sheath 1: and welding a copper sheath 1 on the outer side of the sintered wire core 2 and binding grains to obtain a finished product of the flexible insulated cable.
In the preparation method of the flexible insulated cable, the conductor 21 is a tinned copper conductor, so that copper can be prevented from being oxidized in a high-temperature environment, the conductor 21 can keep good conductive performance in the high-temperature environment, and the fire-resistant and high-temperature-resistant performance of the cable is improved;
because the calcined mica tape is used as the material of the insulating layer 22, the separation temperature of crystal water of the calcined mica tape is high, the fire resistance of the cable can be improved, and the fire resistance grade requirement of the cable can be met; the flexible cable is good in flexibility, is not easy to fall off in the wrapping process, and can be suitable for the processing process of small-section cables; on the other hand, the content of fluorine element in the calcined mica tape is low, so that toxic and harmful gas released during combustion can be reduced, and the mica tape is more environment-friendly;
in addition, the wire core 2 is sintered at high temperature before the sheath 1 is welded, so that the adhesive in the burning mica tape is densified, the heat release quantity of the adhesive in the burning process can be effectively reduced, and the flame retardant property of the cable is improved.
More specifically, in the insulating wrapping step:
4-8 layers of calcined mica tapes are coated on the outer layer of the obtained tin-plated copper conductor to form an insulating layer 22, and 1-3 layers of glass fiber tapes are coated on the outer layer of the insulating layer 22 to form a wrapping layer 23.
More specifically, if the flexible insulated cable that needs to be prepared is the structure of many multicore, then insulating step is around the package:
coating a plurality of layers of calcined mica tapes on the outer layer of the obtained tin-plated copper conductor to form an insulating layer 22, and coating a plurality of layers of glass fiber tapes on the outer layer of the insulating layer 22 to form a wrapping layer 23;
and stranding the multiple wire cores 2 to form a stranded wire, and then coating a plurality of layers of glass fiber tapes on the outer layer of the stranded wire to form a lapping layer 23.
The above procedure was used to prepare a cable with a multi-wire core structure as shown in figure 2.
The sintering step specifically comprises:
primary heating: putting the wire core 2 into a closed sintering furnace or an annealing furnace, heating to 130-150 ℃, and synchronously vacuumizing the furnace to-0.15- -0.1MPa for 1-1.5 h in the heating process;
secondary heating: and filling inert gas such as nitrogen into the furnace, heating the furnace to 300-350 ℃, keeping for 1-2 h to fully sinter and densify the adhesive in the calcined mica tape, naturally cooling for about 4h through air, and then cooling to the normal temperature state through water, thus discharging the mica tape from the furnace.
Through the sintering step, the adhesive in the calcined mica tape can be fully sintered and densified, the heat release of the adhesive in the combustion process can be effectively reduced, and the flame retardant property of the cable is improved.
The step of welding the sheath 1 is as follows:
the sheath 1 is welded on the outer side of the sintered wire core 2 by adopting an argon arc welding process, and the argon arc welding process can effectively prevent the welding area from being oxidized.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the present disclosure, and in the absence of a contrary explanation, these directional terms are not intended to indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present disclosure.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present disclosure.
Claims (6)
1. A flexible insulated cable, comprising:
the cable comprises a sheath and a cable core sleeved in the sheath;
the core comprises:
the conductor is a tin-plated copper conductor;
the insulating layer covers the outer layer of the conductor, and is a calcined mica tape;
the wrapping layer is coated on the outer layer of the insulating layer and is a glass fiber tape.
2. The flexible insulated cable of claim 1, wherein the number of layers of calcined mica tapes in the insulating layer is 4-8.
3. The flexible insulated cable of claim 2, wherein the calcined mica tape has a thickness of 0.2mm to 0.6 mm.
4. The flexible insulated cable of claim 3, wherein the number of layers of glass fiber tape in the wrapping layer is 1-3.
5. The flexible insulated cable of claim 4, wherein the glass fiber tape has a thickness of 0.5mm to 0.8 mm.
6. The flexible insulated cable of claim 1, wherein the conductor is a solid core structure or a stranded compacted structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220452080.4U CN217113925U (en) | 2022-03-03 | 2022-03-03 | Flexible insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220452080.4U CN217113925U (en) | 2022-03-03 | 2022-03-03 | Flexible insulated cable |
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| Publication Number | Publication Date |
|---|---|
| CN217113925U true CN217113925U (en) | 2022-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220452080.4U Active CN217113925U (en) | 2022-03-03 | 2022-03-03 | Flexible insulated cable |
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| Country | Link |
|---|---|
| CN (1) | CN217113925U (en) |
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- 2022-03-03 CN CN202220452080.4U patent/CN217113925U/en active Active
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