CN212782817U - Insulating layer of high-molecular polymer insulating fire-resistant cable - Google Patents
Insulating layer of high-molecular polymer insulating fire-resistant cable Download PDFInfo
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- CN212782817U CN212782817U CN202021410102.8U CN202021410102U CN212782817U CN 212782817 U CN212782817 U CN 212782817U CN 202021410102 U CN202021410102 U CN 202021410102U CN 212782817 U CN212782817 U CN 212782817U
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Abstract
The utility model discloses an insulating layer of insulating fire resisting cable of macromolecular polymer, including interior ceramic fibre layer, ceramic fibre square packing that from interior to exterior set up dredges around layer, outer ceramic fibre layer and glass fiber bundler. The inner ceramic fiber layer is coated outside the cable core of the cable; the ceramic fiber square packing sparse winding layer is provided with a plurality of ceramic fiber square packing, and the plurality of ceramic fiber square packing are annularly and equidistantly arranged and are sparse wound on the ceramic fiber layer; the outer ceramic fiber layer is spirally wound outside the ceramic fiber square packing loose winding layer in a seamless manner by a ceramic fiber rope to form armor cladding, so that a protective heat insulation air gap is formed between the outer ceramic fiber layer and the inner ceramic fiber layer; the glass fiber strapping layer is coated outside the outer ceramic fiber layer. The cable not only has good fire-resistant and heat-insulating properties, but also has good bending properties. The production and manufacturing efficiency of the thermal insulation layer is high, and the thermal insulation layer at the end part of the cable is easy to peel off in laying construction.
Description
Technical Field
The utility model relates to a wire and cable field especially relates to an insulating layer of insulating fire resisting cable of high molecular polymer.
Background
With the further development of economic construction in China and the improvement of the living standard of people, people pay more and more attention to the fire-resistant cable. From the fire statistics data published by the fire department in the department of public security, the electric fire accounts for about 30% of the total number, and more than 40% of the fires caused by various types of electricity are caused by wires and cables. Therefore, in important places such as high-rise buildings, large public places, subways, high-speed rails, power plants, nuclear power stations, long and large tunnels and the like, the fire resistance requirements are gradually put forward for cables in medium-voltage and low-voltage power distribution and supply systems, and when a fire disaster occurs, normal power supply must be ensured for a certain time, so that personnel have time to safely evacuate and evacuate away from the fire scene.
Modern power load is continuously increased, power supply and distribution can not be realized by a low-voltage cable adopting a general inorganic insulation structure of a low-voltage fire-resistant cable, and the medium-voltage power supply voltage is high, and the transmission electric energy capacity is large. Especially, the requirement of high-molecular polymer insulation medium-voltage cables on electrical insulating performance is high, so that the difficulty of fire-resistant and heat-insulating structures of medium-voltage fire-resistant cables is large. The method is very important for realizing reasonable fire-resistant and heat-insulating structures and material application of the cables, realizing production process methods, meeting requirements on fire-resistant characteristics, being convenient for installation and laying construction of the cables and the like.
For the heat insulation layer of the high polymer insulating fire-resistant cable, the currently common manufacturing method is to wrap and cover with a glass fiber tape (belonging to a textile tape) in order to achieve the effect of heat insulation of the cable core, and because the glass fiber tape is thinner in thickness, a plurality of layers of glass fiber tapes need to be wrapped and covered repeatedly, the total thickness is generally more than 6mm, 30 layers of glass fiber tapes with the thickness of 0.2mm need to be wound to achieve a certain heat insulation effect, the production efficiency is low, the wrapping and covering layer is too compact and free of air gaps, the heat resistance is not ideal, and the manufacturing method of the heat insulation layer is called as a 'tape overlapping wrapping type' for short. When the fire-resistant cable is laid and installed, particularly when a cable intermediate joint and a terminal are manufactured, the heat insulation layer needs to be stripped, and the construction progress is influenced due to the fact that too many belt laminations are stripped, time and labor are wasted, and the difficulty is very high. In addition, because the heat insulation layer is formed by repeatedly wrapping fiber strips, the hardness of the cable is increased, the flexibility of the cable is reduced, and the bending performance of the cable is also influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a insulating layer of insulating fire resisting cable of high molecular polymer that pliability can be good and the tip easily peels off is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
the utility model provides a thermal-protective layer of insulating fire-resistant cable of macromolecular polymer, the thermal-protective layer sets up between the cable core of cable and halogen-free fire-retardant oversheath, its characterized in that, the thermal-protective layer includes:
the inner ceramic fiber layer is coated outside the cable core of the cable;
the ceramic fiber square packing loose-winding layer is arranged outside the inner ceramic fiber layer and is provided with a plurality of ceramic fiber square packing, and the plurality of ceramic fiber square packing are annularly and equidistantly arranged and are loose-wound on the ceramic fiber layer;
the outer ceramic fiber layer is spirally wound outside the ceramic fiber square packing loose winding layer in a seamless manner by a ceramic fiber rope to form armor cladding, so that a protective heat insulation air gap is formed between the outer ceramic fiber layer and the inner ceramic fiber layer; and
and the glass fiber strapping layer is coated outside the outer ceramic fiber layer.
The technical scheme is that the inner ceramic fiber layer is wound outside the cable core by a seamless spiral ceramic fiber rope, and the spiral directions of the inner ceramic fiber layer, the ceramic fiber square packing sparse winding layer and the outer ceramic fiber layer are sequentially reversed from inside to outside.
The further technical proposal is that the inner ceramic fiber layer is formed by weaving ceramic fiber ropes.
The technical scheme is that the glass fiber strapping layer is formed by lapping a single glass fiber flame-retardant belt or lapping one or two glass fiber flame-retardant belt layers with double belt gaps.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
ceramic fiber layer, ceramic fiber square packing are dredged around layer, outer ceramic fiber layer and glass fiber band bundling layer and all have high temperature resistant characteristic in the insulating layer setting of this cable, and ceramic fiber layer and glass fiber bundling layer have high temperature resistant characteristic, adopt ceramic fiber layer and glass fiber bundling layer stack setting, can increase inside high temperature resistant, the heat-proof quality of cable, guarantee the inside job stabilization of cable. In addition, the ceramic fiber layer is compatible with the physical and chemical properties of the high polymer insulated cable, has the performance advantages of fire resistance and low thermal conductivity, and can effectively improve the heat insulation and heat resistance effects.
The ceramic fiber layer on the outer layer is sheathed by armor, and the fiber rope has certain elasticity, so that the hardness of the prepared heat-insulating layer is much lower than that of the conventional 'tape-laminated-sheathed' heat-insulating layer, and the bending performance of the cable cannot be influenced.
And because the relative ratio of the fiber ropes is thicker, the thickness requirement can be met by winding one layer or two layers, the processing is simple, and when the cable intermediate joint and the terminal are manufactured in the cable laying construction, the stripping of the heat insulation layer is easier than that of the conventional 'belt layer overlapping cladding type' heat insulation layer, the time and the labor are saved, and the working efficiency is improved.
In addition, a ceramic fiber square packing sparse winding layer is further arranged in a heat insulation layer of the cable, the ceramic fiber square packing sparse winding layer supports the outer ceramic fiber layer, certain strength is achieved, protective heat insulation air gaps are formed between the inner ceramic fiber layer and the outer ceramic fiber layer, compared with the conventional 'belt laminated coating type' heat insulation layer, the heat conductivity is reduced, the heat resistance and the heat insulation performance of the heat insulation layer are greatly improved, meanwhile, a buffered deformation space is formed between the inner ceramic fiber layer and the outer ceramic fiber layer, and the cable core is prevented from being damaged by thermal stress.
Moreover, the armor is adopted to cover the outer ceramic fiber rope, so that the uniform protection and heat insulation air gap between the two ceramic fiber square packing sets can be ensured;
and finally, the glass fiber strapping layer straps and fixes the inner ceramic fiber layer, the ceramic fiber square packing sparse winding layer and the outer ceramic fiber layer so as to keep the overall structure of the heat insulation layer stable.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of an application of a thermal insulation layer in a fire-resistant cable.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, a heat insulation layer of a high polymer insulation fire-resistant cable is arranged between a cable core 1 and a halogen-free flame-retardant outer sheath 4 of the cable, and a fire-resistant oxygen-isolation sleeve 2 and a metal armor layer 3 outside the fire-resistant oxygen-isolation sleeve 2 are generally arranged between the heat insulation layer and the halogen-free flame-retardant outer sheath 4.
The insulating layer in the structure of the high molecular polymer insulated (such as crosslinked polyethylene, ethylene propylene rubber insulated) fire-resistant cable is a vital structural element in the high molecular polymer insulated fire-resistant cable. The quality of the insulating properties determines whether the cable passes the fire-resistant flame test required by the relevant standards. The cable fire resistance is a characteristic that the cable can be continuously operated by electricity for a predetermined time when a fire is burned.
The embodiment of the heat insulating layer of the high polymer insulating fire-resistant cable disclosed by the invention comprises an inner ceramic fiber layer 101, a ceramic fiber square packing sparse winding layer 102, an outer ceramic fiber layer 103 and a glass fiber strapping layer 104 which are arranged from inside to outside.
The inner ceramic fiber layer 101 is coated outside the cable core 1 of the cable. Outside ceramic fiber layer 101 was located in ceramic fiber square packing sparse winding layer 102, had a plurality of ceramic fiber square packing, a plurality of ceramic fiber square packing were arranged in the hoop equidistant to sparse winding in ceramic fiber layer 101. The outer ceramic fiber layer 103 is spirally wound outside the ceramic fiber square packing loose winding layer 102 by a ceramic fiber rope without gaps (tight) to form an armor coating, so that a protective heat insulation air gap is formed between the outer ceramic fiber layer 103 and the inner ceramic fiber layer 101. The glass fiber bundling layer 104 is coated outside the outer ceramic fiber layer 103.
Wherein, the ceramic fiber rope in outer ceramic fiber layer 103 can choose ceramic fiber to turn round the rope or the spacing packing of pottery for use, and its cross-section can be circular or square. During processing, a steel wire armoring machine (equivalent to replacing a steel wire with a fiber rope) is adopted, a stranding cage of the armoring machine rotates, and the cable core 1 moves forwards under traction, so that the ceramic fiber rope is spirally wrapped and coated on the outer surface of the glass fiber rope 102.
Ceramic fiber layer, ceramic fiber square packing are dredged around layer, outer ceramic fiber layer and glass fiber band bundling layer and all have high temperature resistant characteristic in the insulating layer setting of this cable, and ceramic fiber layer and glass fiber bundling layer have high temperature resistant characteristic, adopt ceramic fiber layer and glass fiber bundling layer stack setting, can increase inside high temperature resistant, the heat-proof quality of cable, guarantee the inside job stabilization of cable. In addition, the ceramic fiber layer is compatible with the physical and chemical properties of the high polymer insulated cable, has the performance advantages of fire resistance and low thermal conductivity, and can effectively improve the heat insulation and heat resistance effects.
The ceramic fiber layer on the outer layer is sheathed by armor, and the fiber rope has certain elasticity, so that the hardness of the prepared heat-insulating layer is much lower than that of the conventional 'tape-laminated-sheathed' heat-insulating layer, and the bending performance of the cable cannot be influenced.
And because the relative ratio of the fiber ropes is thicker, the thickness requirement can be met by winding one layer or two layers, the processing is simple, and when the cable intermediate joint and the terminal are manufactured in the cable laying construction, the stripping of the heat insulation layer is easier than that of the conventional 'band layer laminated coated' heat insulation layer band layer by layer, the time and the labor are saved, and the working efficiency is improved.
In addition, a ceramic fiber square packing sparse winding layer is further arranged in a heat insulation layer of the cable, the ceramic fiber square packing sparse winding layer supports the outer ceramic fiber layer, certain strength is achieved, protective heat insulation air gaps are formed between the inner ceramic fiber layer and the outer ceramic fiber layer, compared with the conventional 'belt laminated coating type' heat insulation layer, the heat conductivity is reduced, the heat resistance and the heat insulation performance of the heat insulation layer are greatly improved, meanwhile, a buffered deformation space is formed between the inner ceramic fiber layer and the outer ceramic fiber layer, and the cable core is prevented from being damaged by thermal stress.
Moreover, the armor is adopted to cover the outer ceramic fiber rope, so that the uniform protection and heat insulation air gap between the two ceramic fiber square packing sets can be ensured;
and finally, the glass fiber strapping layer straps and fixes the inner ceramic fiber layer, the ceramic fiber square packing sparse winding layer and the outer ceramic fiber layer so as to keep the overall structure of the heat insulation layer stable.
According to the disclosed embodiment of the thermal insulation layer of the high polymer insulation fire-resistant cable, the inner ceramic fiber layer 101 is also spirally wound outside the cable core 1 in a seamless manner by a ceramic fiber rope, and the spiral directions of the inner ceramic fiber layer 101, the ceramic fiber square-disc packing sparse winding layer 102 and the outer ceramic fiber layer 103 are sequentially reversed from inside to outside so as to keep the structure of the thermal insulation layer stable.
According to the disclosed embodiment of the thermal insulation layer of the high polymer insulation fire-resistant cable, the inner ceramic fiber layer 101 is formed by weaving ceramic fiber ropes, and the ceramic fiber ropes are woven and coated on the surface of the cable core 1 by a horizontal weaving machine during production, wherein the weaving and coating can be one layer or two layers.
According to the disclosed embodiment of the heat insulating layer of the high polymer insulating fire-resistant cable, the glass fiber strapping layer 104 is formed by lapping a single glass fiber flame-retardant tape or lapping one or two glass fiber flame-retardant tape layers with a double tape gap.
The whole thickness of the heat insulation layer is easier to adjust, and generally, the size of the external dimensions (namely, the thickness and the fineness) of the fiber rope and the square coil root is selected and changed.
The above is only the preferred embodiment of the present invention, and any person can make some simple modifications, deformations and equivalent replacements according to the present invention, all fall into the protection scope of the present invention.
Claims (4)
1. The utility model provides a thermal-protective layer of insulating fire-resistant cable of macromolecular polymer, the thermal-protective layer sets up between cable core (1) and halogen-free fire-retardant oversheath (4) of cable, its characterized in that, the thermal-protective layer includes:
the inner ceramic fiber layer (101) is coated outside the cable core (1) of the cable;
the ceramic fiber square packing sparse winding layer (102) is arranged outside the inner ceramic fiber layer (101) and is provided with a plurality of ceramic fiber square packing, and the plurality of ceramic fiber square packing are arranged in the annular direction at equal intervals and are sparse wound on the ceramic fiber layer (101);
the outer ceramic fiber layer (103) is spirally wound outside the ceramic fiber square packing loose winding layer (102) in a seamless manner by a ceramic fiber rope to form armor cladding, so that a protective heat insulation air gap is formed between the outer ceramic fiber layer (103) and the inner ceramic fiber layer (101); and
and the glass fiber binding layer (104) is coated outside the outer ceramic fiber layer (103).
2. The thermal insulation layer of the high polymer insulation fire-resistant cable according to claim 1, wherein the inner ceramic fiber layer (101) is also spirally wound outside the cable core (1) by a ceramic fiber rope without gaps, and the spiral directions of the inner ceramic fiber layer (101), the ceramic fiber square-disc packing sparse-winding layer (102) and the outer ceramic fiber layer (103) are sequentially reversed from inside to outside.
3. The insulation layer of a high polymer insulation fire-resistant cable according to claim 1, wherein the inner ceramic fiber layer (101) is formed by weaving ceramic fiber ropes.
4. The heat insulating layer of the high polymer insulating fire-resistant cable according to claim 1, wherein the glass fiber strapping layer (104) is formed by one or two layers of single-tape overlapping wrapping or double-tape gap wrapping of glass fiber flame-retardant tapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021410102.8U CN212782817U (en) | 2020-07-17 | 2020-07-17 | Insulating layer of high-molecular polymer insulating fire-resistant cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021410102.8U CN212782817U (en) | 2020-07-17 | 2020-07-17 | Insulating layer of high-molecular polymer insulating fire-resistant cable |
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| Publication Number | Publication Date |
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| CN212782817U true CN212782817U (en) | 2021-03-23 |
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| CN202021410102.8U Active CN212782817U (en) | 2020-07-17 | 2020-07-17 | Insulating layer of high-molecular polymer insulating fire-resistant cable |
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