Fire-resistant B1-level CAN BUS bus cable
By adopting specific hierarchical structures and materials combinations in CAN BUS bus cables, including single-sided glass fiber gold mica straps and low-smoke halogen-free straps, the problems of poor refractory performance of the cables, heat generation and smoke production during combustion, are solved. The effect of not having short circuits at high flame temperatures and meeting the B1 level combustion level is achieved.
Patent Information
- Application Number
- CN202411700854.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-01-03
AI Technical Summary
The existing CAN BUS bus cable has poor fire resistance and cannot maintain communication capabilities for a long time during a fire. It also generates a large amount of heat, produces a large amount of smoke, and is prone to ignition. It cannot meet the B1 combustion level requirements.
Using a combined structure of conductor, insulating layer, single-sided glass fiber gold mica wrapping, fill core, low-smoke halogen-free wrapping, aluminum foil shielding, braided shielding, single-sided glass fiber gold mica wrapping and sheath layer to ensure The insulated wire core surface is wrapped around a single-sided glass fiber gold mica strap, a low-smoke halogen-free strap and a metal shielding layer are isolated from the flame, and the combined shielding layer is wrapped around a single-sided glass fiber gold mica strap, and the sheath layer is low-smoke-free Halogen flame retardant polyolefin material meets the B1 combustion requirements.
Avoid short circuit under continuous flame conditions, reduce heating and smoke production, meet the requirements of B1 combustion grade, and improve the safety and fire resistance of the cable.
Smart Images
Figure CN119252546A_ABST
Abstract
Description
Technical Field
[0001] The invention mainly relates to the technical field of communication bus cables, and in particular to a fire-resistant B1-level CAN BUS bus cable. Background Art
[0002] CAN (Controller Area Network) is a multi-master serial communication bus. The basic design specifications require high bit rate, high electromagnetic interference resistance, and the ability to detect any errors. CAN is an ISO internationally standardized serial communication protocol, and its international standards are ISO 11898 and ISO 11519. According to the requirements of the protocol, the industry has developed CANBUS bus cables, which have the advantages of high transmission performance, low cost, and easy installation.
[0003] At present, the CAN BUS cables on the market are mainly used inside the equipment, and they have certain low-smoke halogen-free flame retardant properties. As people have higher and higher requirements for the fire safety of vehicles and industrial equipment, the existing CAN BUS cables do not have good fire resistance, cannot meet the long-term fire resistance requirements, and do not have the ability to maintain a certain communication for a long time when a fire occurs; at the same time, the existing CAN BUS cables generate a lot of heat and smoke when burning, and are easy to spread, etc., and cannot meet the B1 combustion grade requirements of low heat, low smoke, and low spread. Summary of the invention
[0004] The purpose of the present invention is to provide a fire-resistant B1-level CAN BUS cable to solve the problems of poor fire resistance of existing CAN BUS cables, short circuit under the conditions of flame temperature of 750°C and duration of 90 minutes, high heat generation, large smoke production and easy combustion when burning.
[0005] To achieve the above-mentioned object, the present invention provides a fire-resistant B1-class CAN BUS cable, comprising a conductor (1), an insulating layer (2), a single-sided glass fiber phlogopite tape (3), a filling core (4), a low-smoke zero-halogen tape (5), an aluminum foil shielding layer (6), a braided shielding layer (7), a single-sided glass fiber phlogopite tape (8), and a sheath layer (9); The insulating layer (2) wraps the conductor (1) as an insulating wire core, and the surfaces of the plurality of insulating wire cores are respectively wrapped with single-sided glass fiber phlogopite mica tapes (3); The filling core (4) is placed in an area surrounded by a plurality of insulating cores, the plurality of insulating cores and a filling core are twisted into a cable, and a low-smoke zero-halogen tape (5) is wrapped around the outside of the twisted cable; The low-smoke zero-halogen tape (5) is longitudinally wrapped with an aluminum foil shielding layer (6), the aluminum foil shielding layer is covered with a braided shielding layer (7) to form a combined shielding layer, the combined shielding layer is wrapped with a single-sided glass fiber phlogopite tape (8), and a sheath layer (9) is arranged outside the single-sided glass fiber phlogopite tape.
[0006] Furthermore, the conductor (1) is a Category 5 tinned copper stranded conductor, the diameter of a single wire is not greater than 0.18 mm, and the stranding pitch is not greater than 11 mm.
[0007] Furthermore, the insulation layer (2) is extruded from low-density solid polyethylene outside the conductor, the extrusion temperature of the insulation layer material is 160-220° C., the thickness of the insulation layer is 0.5-0.7 mm, and the concentricity of the insulation layer is not less than 95%.
[0008] Furthermore, the single-sided glass fiber phlogopite tape (3) is a composite of a glass fiber reinforcement layer and a refractory mica powder, the content of the refractory mica powder in the single-sided glass fiber phlogopite tape is not less than 70%, the tensile strength of the glass fiber reinforcement layer is not less than 130N / cm, and when the single-sided glass fiber phlogopite tape (3) is wrapped, the thickness of the mica tape is controlled to be 0.14mm, the wrapping tension is 6-10N, and the wrapping overlap rate is 30%-40%; The single-sided glass fiber phlogopite tape (8) has the same material and thickness as the single-sided glass fiber phlogopite tape (3), the width of the single-sided glass fiber phlogopite tape (8) is greater than the width of the single-sided glass fiber phlogopite tape (3), the wrapping tension of the single-sided glass fiber phlogopite tape (8) during wrapping is 9-13N, and the wrapping overlap rate is 35%-40%.
[0009] Furthermore, the filling core (4) is extruded from a low-density polyethylene material at an extrusion temperature of 160-220°C.
[0010] Furthermore, the low-smoke zero-halogen wrapping tape (5) comprises glass fiber filaments, has a thickness of 0.08 mm, a wrapping tension of 10-12 N, and a wrapping overlap rate of 25-30%.
[0011] Furthermore, the aluminum foil shielding layer (6) is made of single-sided aluminum foil with a thickness of no more than 0.065 mm and an aluminum foil overlap rate of no less than 15%.
[0012] Furthermore, the braided shielding layer (7) is braided with tinned copper wires, the diameter of the braided single wire is not greater than 0.12 mm, the braiding pitch is not greater than 25 mm, and the braiding density is not less than 85%.
[0013] Furthermore, the sheath layer (9) is made of a low-smoke halogen-free flame-retardant polyolefin material that meets the B1 combustion requirements, the thickness of the sheath layer is 1.0 mm to 1.4 mm, the thickness of the thinnest point of the sheath layer is not less than 0.8 mm, the extrusion temperature of the sheath layer material is 151 to 183° C., and the concentricity of the sheath layer is not less than 75%.
[0014] Furthermore, the number of the insulated cores is an even number.
[0015] Beneficial effects: The present invention provides a fire-resistant B1-level CAN BUS cable, which has the following beneficial effects: (1) It has good fire resistance and can avoid short circuit under continuous flame conditions: a single-sided glass fiber phlogopite tape is wrapped around the surface of the insulating core to ensure that after the insulating material on the surface of the insulating core burns and the bare conductor is exposed, the conductor core is isolated, thereby avoiding the problem of short circuit; a low-smoke zero-halogen tape and a metal shielding layer are arranged outside the cable core, which also isolate the flame to a certain extent and play a certain auxiliary role in the fire resistance; a single-sided glass fiber phlogopite tape and a low-smoke zero-halogen flame-retardant sheath material are arranged outside the cable shielding layer, which also isolate the flame to a certain extent and play a certain auxiliary role in the fire resistance ; (2) The CANBUS bus cable in the present invention meets the B1 combustion level requirements and has better safety in use: for the first time, it is proposed to wrap a single-sided glass fiber phlogopite tape on the surface of the combined shielding layer. This method can effectively block the flame from burning inward, thereby effectively protecting the internal structure of the cable and playing a good protective role in reducing the total amount of heat and smoke and the rate of heat and smoke; the sheath material of the cable is changed to a low-smoke, halogen-free, flame-retardant polyolefin material that meets the B1 combustion requirements. The material has the characteristics of low heat generation, low smoke generation, and low flame retardancy. At the same time, after combustion, the material will partially crust to reduce the flame burning the inside of the cable core. This ensures that during the combustion process of the entire cable, its flame extension height, total heat release and rate, total smoke release and rate, etc. meet the B1 combustion level requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of a fire-resistant B1-class CAN BUS cable.
[0018] Description of reference numerals: Among them: 1 is the conductor; 2 is the insulation layer; 3 is the single-sided glass fiber phlogopite tape; 4 is the filling core; 5 is the low-smoke zero-halogen tape; 6 is the aluminum foil shielding layer; 7 is the braided shielding layer; 8 is the single-sided glass fiber phlogopite tape; 9 is the sheath layer. DETAILED DESCRIPTION
[0019] The preferred mechanism and implementation method of the present invention are further described below in conjunction with the accompanying drawings and specific implementation methods. Example
[0020] like Figure 1 As shown, the embodiment of the present invention discloses a technical solution for a fire-resistant B1-level CAN BUS cable.
[0021] The present invention provides a fire-resistant B1-level CAN BUS cable, comprising a conductor 1, an insulating layer 2, a single-sided glass fiber phlogopite tape 3, a filling core 4, a low-smoke halogen-free tape 5, an aluminum foil shielding layer 6, a braided shielding layer 7, a single-sided glass fiber phlogopite tape 8, and a sheath layer 9; The insulating layer 2 wraps the conductor 1 as an insulating wire core, and the surfaces of several insulating wire cores are respectively wrapped with single-sided glass fiber phlogopite mica tapes 3; The filling core 4 is placed in an area surrounded by a plurality of insulating cores, and the plurality of insulating cores and one filling core are twisted into a cable, and a low-smoke zero-halogen tape 5 is wrapped around the outside of the twisted cable; The low-smoke zero-halogen tape 5 is longitudinally wrapped with an aluminum foil shielding layer 6, the aluminum foil shielding layer is covered with a braided shielding layer 7 to form a combined shielding layer, the combined shielding layer is wrapped with a single-sided glass fiber phlogopite tape 8, and a sheath layer 9 is arranged outside the single-sided glass fiber phlogopite tape.
[0022] Furthermore, the conductor 1 is a Category 5 tinned copper stranded conductor, the diameter of the single wire is not greater than 0.18 mm, and the stranding pitch is not greater than 11 mm.
[0023] Furthermore, the insulating layer 2 is extruded from low-density solid polyethylene outside the conductor, the extrusion temperature of the insulating layer material is 160-220° C., the thickness of the insulating layer is 0.5-0.7 mm, and the concentricity of the insulating layer is not less than 95%.
[0024] Furthermore, the single-sided glass fiber phlogopite tape 3 is a composite of a glass fiber reinforcement layer and a refractory mica powder, the content of the refractory mica powder in the single-sided glass fiber phlogopite tape is not less than 70%, the tensile strength of the glass fiber reinforcement layer is not less than 130N / cm, and the thickness of the mica tape is controlled to be 0.14mm when the single-sided glass fiber phlogopite tape (3) is wrapped, the wrapping tension is 6~10N, and the wrapping overlap rate is 30%~40%; The material and thickness of the single-sided glass fiber phlogopite tape 8 are the same as those of the single-sided glass fiber phlogopite tape 3. The width of the single-sided glass fiber phlogopite tape 8 is greater than that of the single-sided glass fiber phlogopite tape 3. The wrapping tension of the single-sided glass fiber phlogopite tape 8 is 9-13N, and the wrapping overlap rate is 35%-40%.
[0025] Furthermore, the filling core 4 is extruded from a low-density polyethylene material at a temperature of 160-220° C., and the diameter and roundness of the filling core are strictly controlled.
[0026] Furthermore, the composition of the low-smoke halogen-free tape 5 includes glass fiber filaments, which have the characteristics of non-combustion and non-smoke generation, and are used to protect the internal structure of the cable core. During production, the tape thickness is controlled to be 0.08mm, the wrapping tension is 10~12N, and the wrapping overlap rate is 25~30%.
[0027] Furthermore, the aluminum foil shielding layer 6 uses single-sided aluminum foil with a thickness of no more than 0.065 mm and an aluminum foil overlap rate of no less than 15%. When wrapping the aluminum foil, wrinkles, warping and other undesirable phenomena should be avoided.
[0028] Furthermore, the braided shielding layer 7 is woven with tinned copper wire, the diameter of the braided single wire is not greater than 0.12 mm, the braiding pitch is not greater than 25 mm, the braiding density is not less than 85%, the braiding process should avoid wire skipping, and the joints should be smooth when the single wires are connected.
[0029] Furthermore, the sheath layer 9 is made of low-smoke halogen-free flame-retardant polyolefin material that meets B1 combustion requirements, the sheath layer thickness is 1.0mm~1.4mm, the thickness of the thinnest point of the sheath layer is not less than 0.8mm, the extrusion temperature of the sheath layer material is 151~183℃, and the concentricity of the sheath layer is not less than 75%.
[0030] Furthermore, the number of the insulated cores is an even number.
[0031] Key points of the present invention: 1. The cable meets the flame temperature of 750℃ and the duration of 90 minutes. The refractory material selection and structural design: Since the cable insulation material itself is flammable, the insulation material will burn or gasify under continuous flame conditions, resulting in exposed conductors, and then short circuit problems, affecting the use of the cable. In order to solve the above problems, the present invention patent first proposed to wrap the insulation surface with a single-sided glass fiber phlogopite tape, and the content of refractory mica powder in the single-sided glass fiber phlogopite tape was controlled to be ≥70%, and the tensile strength of the glass fiber reinforcement layer was controlled to be ≥130N / cm. When the single-sided glass fiber phlogopite tape was wrapped, the tape thickness was controlled to be 0.14mm, the wrapping tension was controlled to be 6~10N, and the wrapping overlap rate was controlled to be 30%~40%. The single-sided glass fiber phlogopite tape was wrapped around the surfaces of the four-wire insulated cores respectively. Since the refractory mica material in the mica tape has a high temperature resistance grade, the temperature resistance can reach above 800℃. At the same time, the glass fiber reinforcement layer can ensure the integrity of the tape layer and prevent the refractory mica powder from falling off, thereby ensuring that the conductors can still be isolated after the insulating material burns or gasifies. At a flame temperature of 750℃, after burning continuously for 90 minutes, the conductor will not short-circuit.
[0032] 2. Material selection and structural design of cables that meet B1 grade combustion requirements: B1 level combustion is to assess the flame spread height of the cable within 20 minutes of fire supply time, the peak value of heat release rate, the total amount of heat release within 1200 seconds of fire, the combustion growth rate index, the peak value of smoke production rate, and the total amount of smoke production within 1200 seconds when the flame torch power is 20.5kW. To solve the above problems, low-smoke halogen-free tape is used for wrapping after the four-core insulated cores are twisted into a cable. The main component of this material is glass fiber yarn, which has the characteristics of non-combustion and non-smoke production. It is used to protect the internal structure of the cable core. During production, the tape thickness is controlled to 0.08mm, the tape wrapping tension is controlled to 10~12N, and the wrapping coverage rate is controlled to 25~30%. For the first time, it is proposed to wrap the aluminum foil + tinned copper wire braided composite shielding layer with a single-sided glass fiber phlogopite tape of the same material as scheme "1". The wrapping tension is controlled to 9~13N during wrapping, and the wrapping coverage rate is controlled to 35~40%. Because the material has good fire resistance and good structural retention performance, it can isolate the flame or heat from transferring to the inside of the cable core to the maximum extent, thereby effectively reducing the heat release rate, smoke production rate and total smoke production of the internal material of the cable core; the sheath layer adopts low-smoke halogen-free flame-retardant polyolefin material that meets the B1 combustion requirements. The material has the characteristics of low heat generation, low smoke production, and low flame retardancy. At the same time, after combustion, the material will partially crust to reduce the burning of the flame on the inside of the cable core. The sheath layer is extruded by extrusion to control the thickness of the sheath layer between 1.0mm and 1.4mm.
[0033] The finished cable meets the B1 combustion grade requirements when the flame torch power is 20.5kW and the flame supply time is within 20 minutes. The details are as follows: Flame spread 0.69m≤1.5m, peak heat release rate 21kW≤30kW, total heat release within 1200 seconds of fire 6kW≤15kW, combustion growth rate index 68W / s≤150 W / s, peak smoke generation rate 0.07m 2 / s≤0.25m 2 / s, total smoke production in 1200 seconds 40m 2 ≤50m 2 .
[0034] The present invention solves the problems that the existing CAN BUS bus cable does not have good fire resistance, generates a lot of heat and smoke when burning, and is easy to spread flames. The present invention wraps a single-sided glass fiber phlogopite tape around the surface of the insulating core, thereby ensuring that after the insulating material on the surface of the insulating core burns the exposed conductor, the conductor core is isolated, thereby avoiding the problem of short circuit; the present invention wraps a single-sided glass fiber phlogopite tape around the surface of the combined shielding layer, which can effectively block the flame from burning inward, thereby effectively protecting the internal structure of the cable, and plays a good protective role in reducing the total amount of heat and smoke, and reducing the heat and smoke rate; the sheath material of the cable is changed to a low-smoke, halogen-free, flame-retardant polyolefin material that meets the B1 combustion requirements, and has the characteristics of low heat generation, low smoke generation, and not easy to spread flames, so as to reduce the burning of the flame inside the cable core. Thereby ensuring that during the combustion process of the entire cable, its spread of flame height, total heat release and rate, total smoke release and rate, etc. meet the B1 combustion grade requirements Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A fire-resistant B1-class CAN BUS cable, characterized by: It comprises a conductor (1), an insulating layer (2), a single-sided glass fiber phlogopite tape (3), a filling core (4), a low-smoke halogen-free tape (5), an aluminum foil shielding layer (6), a braided shielding layer (7), a single-sided glass fiber phlogopite tape (8), and a sheath layer (9); The insulating layer (2) wraps the conductor (1) as an insulating wire core, and the surfaces of the plurality of insulating wire cores are respectively wrapped with single-sided glass fiber phlogopite mica tapes (3); The filling core (4) is placed in an area surrounded by a plurality of insulating cores, the plurality of insulating cores and a filling core are twisted into a cable, and a low-smoke zero-halogen tape (5) is wrapped around the outside of the twisted cable; The low-smoke zero-halogen tape (5) is longitudinally wrapped with an aluminum foil shielding layer (6), the aluminum foil shielding layer is covered with a braided shielding layer (7) to form a combined shielding layer, the combined shielding layer is wrapped with a single-sided glass fiber phlogopite tape (8), and a sheath layer (9) is arranged outside the single-sided glass fiber phlogopite tape.
2. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The conductor (1) is a Category V tinned copper stranded conductor, with a single wire diameter of no more than 0.18 mm and a stranding pitch of no more than 11 mm.
3. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The insulating layer (2) is extruded from low-density solid polyethylene outside the conductor, the extrusion temperature of the insulating layer material is 160-220° C., the thickness of the insulating layer is 0.5-0.7 mm, and the concentricity of the insulating layer is not less than 95%.
4. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The single-sided glass fiber phlogopite tape (3) is a composite of a glass fiber reinforcement layer and refractory mica powder, the content of refractory mica powder in the single-sided glass fiber phlogopite tape is not less than 70%, the tensile strength of the glass fiber reinforcement layer is not less than 130N / cm, and when the single-sided glass fiber phlogopite tape (3) is wrapped, the thickness of the mica tape is controlled to be 0.14mm, the wrapping tension is 6-10N, and the wrapping overlap rate is 30%-40%; The single-sided glass fiber phlogopite tape (8) has the same material and thickness as the single-sided glass fiber phlogopite tape (3), the width of the single-sided glass fiber phlogopite tape (8) is greater than the width of the single-sided glass fiber phlogopite tape (3), the wrapping tension of the single-sided glass fiber phlogopite tape (8) during wrapping is 9-13N, and the wrapping overlap rate is 35%-40%.
5. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The filling core (4) is extruded from a low-density polyethylene material at a temperature of 160-220°C.
6. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The low-smoke zero-halogen wrapping tape (5) comprises glass fiber filaments, has a thickness of 0.08 mm, a wrapping tension of 10-12 N, and a wrapping overlap rate of 25-30%.
7. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The aluminum foil shielding layer (6) is made of single-sided aluminum foil with a thickness of no more than 0.065 mm and an aluminum foil overlap rate of no less than 15%.
8. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The braided shielding layer (7) is braided with tinned copper wires, the diameter of the braided single wire is not greater than 0.12 mm, the braiding pitch is not greater than 25 mm, and the braiding density is not less than 85%.
9. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The sheath layer (9) is made of a low-smoke, halogen-free, flame-retardant polyolefin material that meets Class B1 combustion requirements, the thickness of the sheath layer is 1.0 mm to 1.4 mm, the thickness of the thinnest point of the sheath layer is not less than 0.8 mm, the extrusion temperature of the sheath layer material is 151 to 183° C., and the concentricity of the sheath layer is not less than 75%.
10. The fire-resistant B1 class CAN BUS cable according to claim 1, characterized in that: The number of insulated cores is an even number.