CN216902354U - Low-smoke halogen-free flame-retardant B2-grade cable - Google Patents
Low-smoke halogen-free flame-retardant B2-grade cable Download PDFInfo
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- CN216902354U CN216902354U CN202123065268.8U CN202123065268U CN216902354U CN 216902354 U CN216902354 U CN 216902354U CN 202123065268 U CN202123065268 U CN 202123065268U CN 216902354 U CN216902354 U CN 216902354U
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Abstract
The utility model discloses a low-smoke halogen-free flame-retardant B2-level cable, which comprises a cable core, and an inner ceramic fiber belt layer, an oxygen barrier layer, an outer ceramic fiber belt layer and a sheath layer which are sequentially coated outside the cable core from inside to outside; the cable core is formed by twisting a plurality of insulated conductors, a fire-proof and non-combustible hollow structure center filling framework and a plurality of fire-proof and non-combustible hollow structure periphery filling frameworks, wherein the center filling framework is arranged in a twisting gap of the center of a twisting body of the insulated conductors, and the periphery filling framework is arranged in a twisting gap of the outer edge of the twisting body of the insulated conductors; the oxygen isolation layer is of a fireproof mud extruded structure. The cable provided by the utility model can effectively meet the specification of flame-retardant B2-grade cables in GB 31247-.
Description
Technical Field
The utility model relates to a power cable, in particular to a power cable capable of passing a flame-retardant B2-level test.
Background
The flame retardant cable B2 grade is a main cable applied to non-personnel-intensive indoor places and the like, and is used as an alarm bus and the like of the non-personnel-intensive indoor places.
For a long time, the technical specification standard in the cable production industry is not clear, and in order to control the manufacturing cost of the cable, the flame-retardant B2-grade cable is molded according to the following structure:
-filling glass fibers in the stranding gaps of the plurality of insulated conductors to form a cable core;
and the outside of the cable core is sequentially coated with a glass fiber tape winding layer, a halogen-free low-smoke polyolefin oxygen-insulating extrusion layer and a low-smoke halogen-free polyolefin sheath extrusion layer from inside to outside.
The flame-retardant B2-grade cable with the traditional structure generally has the temperature resistance and flame retardant grade of no more than 550 ℃. This is because the temperature resistance of the filled glass fiber and wrapped glass fiber tape layer is generally 550 ℃, and once the temperature of the environment exceeds 550 ℃, the filled glass fiber and wrapped glass fiber tape layer will be burnt off, and the burnt off residue is very brittle and will fall off with slight touch or vibration. However, during combustion, the flame temperature is usually above 750 ℃ and even up to 950 ℃. Therefore, when the flame-retardant B2-grade cable with the structure is burnt in a fire, flame or temperature cannot be effectively prevented from being burnt and transmitted to the inside, and an insulating layer with poor flame-retardant performance in a cable core cannot be protected.
The state promulgates the technical standard of mandatory national standard GB 31247 and 2014 classification of cable and optical cable combustion performance in 2015.9. In the technical standard, the flame-retardant B2-grade cable is required to have the following main technical properties:
-flame spread FS of less than or equal to 2.5 m;
-peak heat release rate HRR peak no greater than 60 kW;
total heat release THR in 1200s of fire1200≤30MJ；
-a burn rate increase index FIGRA ≦ 300W/s;
peak value of smoke generation rate SPR less than or equal to 1.5m2/s；
Total amount of smoke TSP in 1200s fired1200≤400m2。
Through repeated tests, the flame-retardant B2-grade cable with the traditional structure cannot pass the flame-retardant B2-grade test according to the technical standard GB 31247-2014, that is, the technology cannot meet the increasingly stringent, more scientific and reasonable technical standard, cannot meet the development requirements of the market and the technology, and needs to be improved.
Chinese patent literature discloses a flame-retardant B1-grade cable having good fire-proof and fire-proof properties and excellent flame-retardant effect, which is disclosed in patent literature CN 210325305, published 2020, 04, month 14. The flame-retardant B1-grade cable is designed according to the specification of the flame-retardant B1-grade cable in the GB 31247-2014 technical standard, and can reliably pass the flame-retardant B1-grade test.
However, the flame-retardant B1-grade cable has better performance than a flame-retardant B2-grade cable, and is mainly applied to places such as intensive-personnel indoor places, for example, subway alarm buses and the like. When the flame-retardant B1-grade cable is applied to a place such as a non-personnel-intensive indoor place, the performance such as power transmission and flame retardance can be reliably realized, but the technical problems of excessive performance and waste exist, the manufacturing cost is relatively high, and the cost performance is low.
SUMMERY OF THE UTILITY MODEL
The technical purpose of the utility model is as follows: aiming at the defects of the prior art, the low-smoke halogen-free flame-retardant B2-grade cable which has good fireproof and fire-insulating performance, can pass a flame-retardant B2-grade test (namely the specification of the flame-retardant B2-grade cable in the GB 31247-2014 technical standard) and has lower cost is provided.
The technical scheme adopted by the utility model for realizing the technical purpose is as follows: a low-smoke halogen-free flame-retardant B2-grade cable comprises a cable core, and an inner ceramic fiber belt layer, an oxygen barrier layer, an outer ceramic fiber belt layer and a sheath layer which are sequentially coated outside the cable core from inside to outside;
the cable core is formed by twisting a plurality of insulated conductors, a fire-insulating and non-combustible hollow structure center filling framework and a plurality of fire-insulating and non-combustible hollow structure periphery filling frameworks, the center filling framework is arranged in twisting gaps of the centers of twisting bodies of the insulated conductors, and the periphery filling framework is arranged in twisting gaps of the outer edges of the twisting bodies of the insulated conductors;
the oxygen isolation layer is of a fire-proof mud extrusion structure.
The technical measures reasonably arrange the inner ceramic fiber belt layer, the oxygen isolation layer, the outer ceramic fiber belt layer and the sheath layer outside the cable core, and the arrangement of the structure ensures that the cable core forms multilayer reliable protection so as to prevent flame from burning to the cable core and prevent external heat from being conducted to the cable core to the maximum extent.
In the cable core structure adopting the technical measures, the arranged filling frameworks (including the central filling framework and the peripheral filling framework) are beneficial to shaping the twisted structure of each insulated conductor. In the second aspect, the filling framework has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, and can not burn, meanwhile, the filling framework can effectively reduce the heat release and smoke yield during burning through the hollow structure, has good fire resistance and fire insulation, and is very favorable for reducing the total heat release index of the cable. And in three aspects, the filling materials are reduced, and the manufacturing cost of the cable is effectively reduced.
The oxygen-isolating layer forming structure adopting the technical measures has the characteristics of high fire resistance limit, low smoke generation amount and the like, and can play the roles of fire resistance, smoke blockage, oil resistance, water resistance, corrosion resistance and the like. The oxygen isolation layer is matched with the inner ceramic fiber belt layer and the outer ceramic fiber belt layer, so that the flame is reliably prevented from burning towards the cable core.
As one of preferable schemes, the cable core is a circular cross-section structure formed by twisting a center filling framework, a plurality of insulated conductors and a plurality of peripheral filling frameworks, the peripheral filling frameworks are arranged in twisting gaps between adjacent insulated conductors on the periphery, and the cross-section outline of the peripheral filling frameworks is in a fan shape. The technical measures are beneficial to rounding of the cable core twisted structure on one hand and enable the twisted gap between the peripheral filling framework and the peripheral adjacent insulated conductor to have good adaptability on the other hand, so that the cable core twisted structure is effectively prevented from extruding the hollow structure of the peripheral filling framework.
As one of the preferable schemes, the center filling framework is an extrusion structure of ceramic fiber cotton or halogen-free low-smoke flame-retardant polyolefin. Furthermore, the center filling framework is ceramic fiber cotton. The center filling framework of the technical measure has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, can not burn, and particularly can resist the high temperature of over 1000 ℃ by the center filling framework formed by ceramic fiber cotton.
As one of the preferable schemes, the peripheral filling framework is an extrusion structure of ceramic fiber cotton or halogen-free low-smoke flame-retardant polyolefin. Further, the peripheral filling framework is ceramic fiber cotton. The peripheral filling framework of the technical measure has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, can not burn, and particularly resists the high temperature of more than 1000 ℃ by the peripheral filling framework formed by ceramic fiber cotton.
Preferably, the inner ceramic fiber tape layer is at least one layer of wrapping structure of ceramic fiber tapes. The technical measure has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, and the cable can not burn, so that the flame can be prevented from burning to the cable core, and the external heat can be prevented from being conducted to the cable core.
Preferably, the outer ceramic fiber belt layer is at least one layer of wrapping structure of the ceramic fiber belt. The technical measure has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, and the cable can not burn, so that the flame can be prevented from burning to the cable core, and the external heat can be prevented from being conducted to the cable core.
As one of the preferable schemes, the sheath layer is of a low-smoke halogen-free flame-retardant polyolefin extrusion structure. The technical measure has the characteristics of oxygen isolation, heat insulation, smoke suppression, wear resistance and the like.
Preferably, the insulated conductor is mainly composed of a conductor and an insulating layer covering the conductor. Further, the conductor is a 1 st copper conductor, a 2 nd copper conductor or a 5 th soft copper conductor in the standard GB/T3956; the conductor is in a single-strand copper wire structure or a multi-strand copper wire twisted structure. The insulating layer is of a cross-linked polyethylene extrusion structure.
The beneficial technical effects of the utility model are as follows: according to the cable core structure adopting the technical measures, the arranged filling frameworks (including the center filling framework and the peripheral filling framework) are beneficial to shaping the stranded structure of each insulated conductor. In the second aspect, the filling framework has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability, high temperature resistance and the like, and can not burn, meanwhile, the filling framework can effectively reduce the heat release and smoke yield during burning through the hollow structure, has good fire resistance and fire insulation, and is very favorable for reducing the total heat release index of the cable. And in three aspects, the filling materials are reduced, and the manufacturing cost of the cable is effectively reduced.
The technical measures reasonably arrange the inner ceramic fiber belt layer, the oxygen isolation layer, the outer ceramic fiber belt layer and the sheath layer outside the cable core. The forming structure of the oxygen isolation layer has the characteristics of high fire resistance limit, low smoke generation amount and the like, and can play roles in fire resistance, smoke blockage, oil resistance, water resistance, corrosion resistance and the like; the oxygen isolation layer is matched with the inner ceramic fiber belt layer and the outer ceramic fiber belt layer, so that the flame is reliably prevented from burning towards the cable core. Through with interior ceramic fiber band layer, separate oxygen layer, outer ceramic fiber band layer and restrictive coating at the outside reasonable arrangement of cable core for form the reliable protection of multilayer to the cable core, with the burning of prevention flame to the cable core, simultaneously can the at utmost prevent outside heat to the cable core conduction.
Tests prove that the flame-retardant cable formed according to the technical measures can effectively meet the specification of flame-retardant B2-grade cables in the technical standards of GB 31247-2014 Cable and optical cable combustion performance grading.
Compared with the flame-retardant B2-grade cable in the traditional design, the flame-retardant cable formed according to the technical measures has the advantages of good fireproof and fire-proof performance, stable performance, high temperature resistance and excellent flame-retardant effect. Compared with the flame-retardant B1-grade cable disclosed in the publication No. CN 210325305, the cable has lower performance but lower cost, can economically and practically meet the application requirements of places such as non-personnel-intensive rooms and the like, and has high cost performance.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Fig. 2 is a schematic structural diagram of the peripheral filling skeleton in fig. 1.
The reference numbers in the figures mean: 1-a conductor; 2-an insulating layer; 3, filling a framework at the periphery; 4-internal ceramic fiber belt layer; 5-oxygen barrier layer; 6-outer ceramic fiber belt layer; 7-a sheath layer; 8-center filling the skeleton.
Detailed Description
The utility model relates to a power cable, in particular to a power cable capable of passing a flame-retardant B2 grade test, and the main technical content of the utility model is explained in detail by a plurality of embodiments. In the embodiment 1, the technical scheme content of the utility model is clearly and specifically explained in conjunction with the attached drawings of the specification, namely, fig. 1 and fig. 2; in other embodiments, although not separately depicted, the main structure of the embodiment can still refer to the drawings of embodiment 1.
It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.
Example 1
Referring to fig. 1 and 2, the cable core comprises a cable core, wherein an inner ceramic fiber belt layer 4, an oxygen isolation layer 5, an outer ceramic fiber belt layer 6 and a sheath layer 7 are coated outside the cable core from inside to outside in sequence.
The cable core is a basic full-circle structure formed by twisting four insulated conductors, a fire-insulating and non-combustible hollow structure center filling framework 8 and four fire-insulating and non-combustible hollow structure periphery filling frameworks 3.
Specifically, each insulated conductor mainly comprises a conductor 1 and an insulating layer 2 coated on the conductor 1. Conductor 1 is a copper conductor of type 1 in the standard GB/T3956, which is a single strand copper wire structure. The insulating layer 2 is an extruded structure of irradiation type cross-linked polyolefin which can resist temperature up to 125 ℃, and other insulating materials can be adopted.
The center filling framework 8 is a ceramic fiber cotton extrusion molding structure, the cross section of the center filling framework is approximately quadrangular, and the interior of the center filling framework is hollow.
The length of the center-fill skeleton 8 corresponds to the length of the insulated conductor. The cross-sectional profile of the center-fill skeleton 8 substantially matches the profile of the center gap where the four insulated conductors are twisted together. The hardness of the center-filling skeleton 8 is ensured not to be extruded to block the hollow structure when the center-filling skeleton 8 is twisted together with the four insulated conductors, and the hardness of the center-filling skeleton 8 is more than or equal to 90A.
The center filling framework 8 is arranged at the twisting centers of the four insulated conductors and is positioned in the center twisting gap of the whole twisting body, and the four insulated conductors are tightly contacted and matched outside the center filling framework 8.
The peripheral filling framework 3 is a ceramic fiber cotton extrusion molding structure, the cross section of the peripheral filling framework is similar to a triangular sector, and the interior of the peripheral filling framework is hollow.
The length of the peripheral filling skeleton 3 corresponds to the length of the insulated conductor. Since the adjacent insulated conductors form an inward concave gap at the outer periphery after the four insulated conductors are twisted together, the inward concave gap has an approximately triangular fan shape compared with the maximum circle formed by the four insulated conductors, and thus the cross-sectional profile of the peripheral filling skeleton 3 is substantially matched with the twisted gap profile between the adjacent insulated conductors at the outer periphery. The hardness of the peripheral filling framework 3 is ensured not to be extruded to block the hollow structure when the peripheral filling framework is twisted together with the four insulated conductors, and the hardness of the peripheral filling framework 3 is generally more than or equal to 90A.
The peripheral filling framework 3 is arranged in the twisting gap between the adjacent insulated conductors at the periphery.
The arrangement structures of the four peripheral filling frameworks 3 are basically consistent.
The cross section of the center filling framework 8, the four insulated conductors and the four peripheral filling frameworks 3 which are twisted together according to the structure is basically in a full circle shape.
The ceramic fiber cotton for forming the center filling framework 8 and the peripheral filling framework 3 is aluminum silicate refractory fiber. The material is prepared by melting hard clay clinker or a synthetic material of industrial alumina powder and silica powder as a raw material by an electric arc furnace or a resistance furnace, forming fibers by blowing compressed air (or a wire throwing method), mainly comprises 30-55% of aluminum oxide and silicon dioxide, and has the characteristics of low heat capacity, low heat conductivity, excellent thermal stability and high temperature resistance of over 1000 ℃ after being reprocessed and formed.
The inner ceramic fiber belt layer 4 is a compact lapping structure of a ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The oxygen isolation layer 5 is of a fire-proof mud extrusion structure.
The outer ceramic fiber belt layer 6 is a compact lapping structure of a ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The sheath layer 9 is an extruded structure of irradiation type low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 2
The cable comprises a cable core, wherein an inner ceramic fiber belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated outside the cable core from inside to outside.
The cable core is a basic full-circle structure formed by twisting three insulated conductors, a fire-insulating and non-combustible hollow structure center filling framework and three fire-insulating and non-combustible hollow structure periphery filling frameworks.
Specifically, each insulated conductor mainly comprises a conductor and an insulating layer coated on the conductor. The conductor is a 2 nd copper conductor in the standard GB/T3956, and is in a stranded copper wire structure. The insulating layer is an extruded structure of irradiation type cross-linked polyolefin which can resist the temperature of 125 ℃, and other insulating materials can be adopted.
The center filling framework is a ceramic fiber cotton extrusion molding structure, the cross section of the center filling framework is similar to a triangle, and the interior of the center filling framework is hollow.
The length of the center-fill skeleton corresponds to the length of the insulated conductor. The cross-sectional profile of the center-fill skeleton substantially matches the profile of the center gap where the three insulated conductors are twisted together. The hardness of the center filling framework is ensured not to be extruded to block the hollow structure when the center filling framework is twisted together with the three insulated conductors, and the hardness of the center filling framework is more than or equal to 90A.
The center filling framework is arranged at the twisting centers of the three insulated conductors and is positioned in the center twisting gap of the whole twisting body, and the three insulated conductors are sequentially in close contact fit outside the center filling framework.
The peripheral filling framework is a ceramic fiber cotton extrusion molding structure, the cross section of the peripheral filling framework is similar to a triangular sector, and the interior of the peripheral filling framework is hollow.
The length of the peripheral filling framework corresponds to the length of the insulated conductor. After the three insulated conductors are twisted together, the adjacent insulated conductors form an inward concave gap on the outer periphery, and the inward concave gap is approximately triangular fan-shaped compared with the maximum circle formed by the three insulated conductors, so that the cross-sectional profile of the peripheral filling framework is basically matched with the twisted gap profile between the adjacent insulated conductors on the outer periphery. The hardness of the peripheral filling framework is ensured not to be extruded to block the hollow structure when the peripheral filling framework is twisted together with the three insulated conductors, and the hardness of the peripheral filling framework is more than or equal to 90A.
The peripheral filling framework is arranged in the twisting gap between the adjacent peripheral insulated conductors.
The arrangement structures of the three peripheral filling frameworks are basically consistent.
The cross sections of the central filling framework, the three insulated conductors and the three peripheral filling frameworks which are twisted together according to the structure are basically in a full circle shape.
The ceramic fiber cotton for forming the center filling framework and the peripheral filling framework is an aluminum silicate refractory fiber. The material is prepared by melting hard clay clinker or a synthetic material of industrial alumina powder and silica powder as a raw material by an electric arc furnace or a resistance furnace, forming fibers by blowing compressed air (or a wire throwing method), mainly comprises 30-55% of aluminum oxide and silicon dioxide, and has the characteristics of low heat capacity, low heat conductivity, excellent thermal stability and high temperature resistance of over 1000 ℃ after being reprocessed and formed.
The inner ceramic fiber belt layer is a two-layer compact lapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The oxygen isolation layer is of a fire-proof mud extrusion structure.
The outer ceramic fiber belt layer is a two-layer compact lapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The sheath layer is an extruded structure of irradiation type low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 3
The cable comprises a cable core, wherein an inner ceramic fiber belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated outside the cable core from inside to outside.
The cable core is a basic full-circle structure formed by twisting five insulated conductors, a fire-insulating and non-combustible hollow structure center filling framework and five fire-insulating and non-combustible hollow structure periphery filling frameworks.
Specifically, each insulated conductor mainly comprises a conductor and an insulating layer coated on the conductor. The conductor is a 5 th soft copper conductor in the standard GB/T3956, and is in a stranded copper wire structure. The insulating layer is an extruded structure of irradiation type cross-linked polyolefin which can resist the temperature of 125 ℃, and other insulating materials can be adopted.
The center filling framework is a halogen-free low-smoke flame-retardant polyolefin extrusion molding structure, the cross section of the center filling framework is approximately pentagonal, and the interior of the center filling framework is hollow.
The length of the center-fill skeleton corresponds to the length of the insulated conductor. The cross-sectional profile of the center-fill skeleton substantially matches the profile of the center gap where five insulated conductors are twisted together. The hardness of the center filling framework is ensured not to be extruded to block the hollow structure when the center filling framework is twisted together with the five insulated conductors, and the hardness of the center filling framework is more than or equal to 90A.
The center filling framework is arranged at the twisting center of the five insulated conductors and is positioned in the center twisting gap of the whole twisting body, and the five insulated conductors are sequentially in close contact fit outside the center filling framework.
The peripheral filling framework is a halogen-free low-smoke flame-retardant polyolefin extrusion molding structure, the cross section of the peripheral filling framework is similar to a triangular sector, and the interior of the peripheral filling framework is hollow.
The length of the peripheral filling framework corresponds to the length of the insulated conductor. After the five insulated conductors are twisted together, the adjacent insulated conductors form an inward concave gap on the periphery, and the inward concave gap is approximately triangular fan-shaped compared with the maximum circle formed by the five insulated conductors, so that the cross-sectional profile of the peripheral filling framework is basically matched with the twisting gap profile between the adjacent insulated conductors on the periphery. The hardness of the peripheral filling framework is ensured not to be extruded to block the hollow structure when the peripheral filling framework is twisted together with the five insulated conductors, and the hardness of the peripheral filling framework is generally more than or equal to 90A.
The peripheral filling framework is arranged in the twisting gap between the adjacent peripheral insulated conductors.
The arrangement structures of the five peripheral filling frameworks are basically consistent.
The cross sections of the center filling framework, the five insulated conductors and the five peripheral filling frameworks which are twisted together according to the structure are basically in a full circle shape.
The inner ceramic fiber belt layer is a three-layer compact lapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of ceramic fiber cotton. The ceramic fiber cotton is an aluminum silicate refractory fiber, which is prepared by melting hard clay clinker or a synthetic material of industrial alumina powder and silica powder by an electric arc furnace or a resistance furnace and forming fibers by blowing compressed air (or a wire throwing method), wherein the chemical components mainly comprise aluminum oxide (30-55%) and silicon dioxide, and the ceramic fiber cotton is processed and formed and has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability and high temperature resistance of over 1000 ℃.
The oxygen isolation layer is of a fire-proof mud extrusion structure.
The outer ceramic fiber belt layer is a three-layer compact wrapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The sheath layer is an extruded structure of irradiation type low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 4
The cable comprises a cable core, wherein an inner ceramic fiber belt layer, an oxygen barrier layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated outside the cable core from inside to outside.
The cable core is a basic full-circle structure formed by twisting four insulated conductors, a fire-proof and non-combustible hollow structure center filling framework and four fire-proof and non-combustible hollow structure periphery filling frameworks.
Specifically, each insulated conductor mainly comprises a conductor and an insulating layer coated on the conductor. The conductor is a 1 st copper conductor in the standard GB/T3956, and is in a stranded copper wire structure. The insulating layer is an extruded structure of irradiation type cross-linked polyolefin which can resist the temperature of 125 ℃, and other insulating materials can be adopted.
The center filling framework is a halogen-free low-smoke flame-retardant polyolefin extrusion molding structure, the cross section of the center filling framework is approximately quadrangular, and the interior of the center filling framework is hollow.
The length of the center-fill skeleton corresponds to the length of the insulated conductor. The cross-sectional profile of the center-filled skeleton substantially matches the profile of the center gap where the four insulated conductors are twisted together. The hardness of the center filling framework is ensured not to be extruded to block the hollow structure when the center filling framework is twisted together with the four insulated conductors, and the hardness of the center filling framework is more than or equal to 90A.
The center filling framework is arranged at the twisting centers of the four insulated conductors and is positioned in the center twisting gap of the whole twisting body, and the four insulated conductors are sequentially in close contact fit outside the center filling framework.
The peripheral filling framework is a ceramic fiber cotton extrusion molding structure, the cross section of the peripheral filling framework is similar to a triangular sector, and the interior of the peripheral filling framework is hollow.
The length of the peripheral filling framework corresponds to the length of the insulated conductor. After the four insulated conductors are twisted together, the adjacent insulated conductors form an inward concave gap on the outer periphery, and the inward concave gap is approximately triangular fan-shaped compared with the maximum circle formed by the four insulated conductors, so that the cross-sectional profile of the peripheral filling framework is basically matched with the twisted gap profile between the adjacent insulated conductors on the outer periphery. The hardness of the peripheral filling framework is ensured not to be extruded to block the hollow structure when the peripheral filling framework is twisted together with the four insulated conductors, and the hardness of the peripheral filling framework is generally more than or equal to 90A.
The peripheral filling framework is arranged in the twisting gap between the adjacent peripheral insulated conductors.
The arrangement structures of the four peripheral filling frameworks are basically consistent.
The cross section of the center filling framework, the four insulated conductors and the four peripheral filling frameworks which are twisted together according to the structure is basically in a full circle shape.
The ceramic fiber cotton with the filling framework at the periphery is an aluminum silicate refractory fiber. The material is prepared by melting hard clay clinker or a synthetic material of industrial alumina powder and silica powder as a raw material by an electric arc furnace or a resistance furnace, forming fibers by blowing compressed air (or a wire throwing method), mainly comprises 30-55% of aluminum oxide and silicon dioxide, and has the characteristics of low heat capacity, low heat conductivity, excellent thermal stability and high temperature resistance of over 1000 ℃ after being reprocessed and formed.
The inner ceramic fiber belt layer is a two-layer compact lapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The oxygen isolation layer is of a fire-proof mud extrusion structure.
The outer ceramic fiber belt layer is a three-layer compact wrapping structure of the ceramic fiber belt. The ceramic fiber band is a spinning structure of the ceramic fiber cotton.
The sheath layer is an extruded structure of irradiation type low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
The above examples are intended to illustrate the utility model, but not to limit it.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications may be made to the above-described embodiments or equivalents may be substituted for some of the features thereof; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.
Claims (10)
1. A low-smoke halogen-free flame-retardant B2-grade cable comprises a cable core, and an inner ceramic fiber belt layer (4), an oxygen barrier layer (5), an outer ceramic fiber belt layer (6) and a sheath layer (7) which are sequentially coated outside the cable core from inside to outside; the method is characterized in that:
the cable core is formed by twisting a plurality of insulated conductors, a fire-insulating and non-combustible hollow structure center filling framework (8) and a plurality of fire-insulating and non-combustible hollow structure periphery filling frameworks (3), wherein the center filling framework (8) is arranged in twisting gaps of the centers of twisting bodies of the insulated conductors, and the periphery filling framework (3) is arranged in twisting gaps of the outer edges of the twisting bodies of the insulated conductors;
the oxygen isolation layer (5) is of a fire-proof mud extrusion structure.
2. The low smoke, zero halogen and flame retardant B2 grade cable of claim 1, wherein: the cable core is a circular section structure formed by twisting a center filling framework (8), a plurality of insulated conductors and a plurality of peripheral filling frameworks (3), the peripheral filling framework (3) is arranged in a twisting gap between adjacent insulated conductors at the periphery, and the cross-section outline of the peripheral filling framework (3) is in a fan shape.
3. The low-smoke halogen-free flame-retardant B2 grade cable according to claim 1 or 2, wherein: the center filling framework (8) is an extrusion structure of ceramic fiber cotton or halogen-free low-smoke flame-retardant polyolefin.
4. The low-smoke halogen-free flame-retardant B2 grade cable according to claim 1 or 2, wherein: the peripheral filling framework (3) is an extrusion structure of ceramic fiber cotton or halogen-free low-smoke flame-retardant polyolefin.
5. The low smoke, zero halogen and flame retardant B2 grade cable of claim 1, wherein: the inner ceramic fiber belt layer (4) is of at least one layer of wrapping structure of the ceramic fiber belt.
6. The low smoke, zero halogen and flame retardant B2 grade cable of claim 1, wherein: the outer ceramic fiber belt layer (6) is of at least one layer of wrapping structure of the ceramic fiber belt.
7. The low smoke, zero halogen and flame retardant B2 grade cable of claim 1, wherein: the sheath layer (7) is of a low-smoke halogen-free flame-retardant polyolefin extrusion structure.
8. The low-smoke halogen-free flame-retardant B2 grade cable according to claim 1 or 2, wherein: the insulated conductor mainly comprises a conductor (1) and an insulating layer (2) coated outside the conductor (1).
9. The low smoke, zero halogen, flame retardant B2 grade cable of claim 8, wherein: the conductor (1) is a 1 st copper conductor, a 2 nd copper conductor or a 5 th soft copper conductor in the standard GB/T3956.
10. The low smoke, zero halogen, flame retardant B2 grade cable of claim 8, wherein: the insulating layer (2) is of an extruded structure of cross-linked polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123065268.8U CN216902354U (en) | 2021-12-08 | 2021-12-08 | Low-smoke halogen-free flame-retardant B2-grade cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123065268.8U CN216902354U (en) | 2021-12-08 | 2021-12-08 | Low-smoke halogen-free flame-retardant B2-grade cable |
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