Fire-resistant cable for bus and silicon rubber mixture of cable extrusion silicon rubber layer

A technology of fire-resistant cable and fire-resistant layer, applied in the direction of insulated cable, rubber insulator, cable, etc., to achieve low dielectric constant, reduce attenuation, and satisfy the effect of dielectric constant

Active Publication Date: 2010-03-17
SHANGHAI ELECTRIC CABLE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the extruded silicone rubber layer is used as the refractory layer, and its thickness often exceeds 0.6mm. The dielectric constant of commonly used silicone rubber materials is between 2.9 and 4.0. Compared with mica tape and mineral insulation, the dielectric constant is smaller, but it is not comparable to industrial Compared with the 2.3 and below of the insulating layer material (polyethylene and foamed polyethylene) of the cable for the bus, it is still larger

Method used

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  • Fire-resistant cable for bus and silicon rubber mixture of cable extrusion silicon rubber layer
  • Fire-resistant cable for bus and silicon rubber mixture of cable extrusion silicon rubber layer
  • Fire-resistant cable for bus and silicon rubber mixture of cable extrusion silicon rubber layer

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Embodiment 1

[0023] figure 1 It is a structural schematic diagram of the fire-resistant cable for the bus of the present invention. Wherein, the fire-resistant layer of the fire-resistant cable for the bus is made by extruding the silicone rubber mixture in the present invention. Cable 1 adopts copper stranded wire 11, and extruded silicone rubber mixture refractory layer 12 with a thickness of 0.10-0.15 mm is extruded on copper stranded wire 11. In particular, the extruded silicone rubber mixture refractory layer 12 in the present invention requires Made of silicone rubber with low dielectric constant. A polyethylene insulating layer 13 with a thickness of 0.35 mm is wrapped around the extruded silicone rubber mixture refractory layer 12, and foamed polyethylene or foamed cross-linked polyethylene can also be used as a substitute to compensate for the disadvantages caused by the use of silicone rubber. The problem of increasing the effective dielectric constant. The metal shielding 14 ...

Embodiment 2

[0025] Compared with embodiment 1, the difference between this embodiment and embodiment 1 is that figure 1 The extruded thickness of the extruded silicone rubber mixture refractory layer 12 is 0.15-0.20mm. Wherein, when the highest transmission frequency is 10MHz, the extruded thickness of the extruded silicone rubber mixture refractory layer may be 0.15mm-0.20mm. All the other parts are identical to Example 1.

[0026] Wherein, the extruded silicone rubber mixture refractory layer in Examples 1 and 2 adopts commercially available ELASTOSIL-N2010 single-component room temperature vulcanized silicone rubber (produced by Wacker Company of Germany) and L-41 silicone oil (produced by Dow Corning Company of the United States) according to its The volume ratio is 9:1, mixed and then extruded, and its dielectric constant is 2.4-3.5 under the measurement condition below 1MHz.

Embodiment 3

[0028] figure 2 In order to apply the present invention to an embodiment of a fire-resistant cable for a Can bus, this embodiment uses the cable 1 in Embodiment 1 as a signal transmission line pair. The fire-resistant cable for the Can bus also includes a power cable pair 5 and two filling cores 6. After the four cores are twisted, a metal overall shield is braided on the outer layer and a total sheath is provided on the metal overall shielding jacket.

[0029] In the present embodiment, the extruded silicone rubber mixture refractory layer with a thickness of 0.10-0.15mm can not only ensure the transmission characteristics of the Can bus cable with double-layer insulating medium, such as guaranteeing the characteristic impedance (120Ω) at 10MHz-100MHz, which is relatively Small attenuation, crosstalk, and structural return loss; and its fire resistance can pass the IEC60331.1 regulation to maintain the line integrity test, the fire supply temperature is 750 ℃, and the two in...

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Abstract

The invention discloses a fire-resistant cable for a bus, comprising a conductor and a fire-resistant layer which is a fire-resistant layer of extrusion silicon rubber mixture, and the thickness of the fire-resistant layer of the extrusion silicon rubber layer is less than or equal to 0.20mm. The invention also discloses a silicon rubber mixture for cables, which is prepared by mixing single-component room temperature vulcanized silicone rubber and silicone oil by volume ratio of 9:1. In the fire-resistant layer of extrusion silicon rubber layer of the invention, the thickness of the fire-resistant layer of traditional silicon rubber is significantly reduced; and the characteristic of low dielectric constant is satisfied. Meanwhile, the invention also overcomes the problem of the attenuation and distortion of transmission signals caused by over-large thickness of the fire-resistant layer and uneven extrusion surface of cables for traditional buses, reduces attenuation, crosstalk and structural return loss, and ensures that the working range of a bus system can not be diminished; and the fire-resistant cable can still keep compact integral structure size by taking account of both fire-resistant property and high-frequency transmission property.

Description

technical field [0001] The invention relates to a fire-resistant cable for a bus, in particular to a fire-resistant cable for a bus used for high-frequency signal transmission and a silicone rubber compound used for extruding the silicone rubber layer of the cable. Background technique [0002] Bus cables, that is, cables with a voltage level of no more than 300V and a signal transmission frequency between 1MHz and 100MHz, are produced with the development of modern control information technology, and are mainly used for instruments, electrical appliances and other automatic controls in industrial power distribution networks. The connecting lines between devices not only transmit control signals and information, but also play a role in transmitting energy in some cases. Traditional bus cables using silicone rubber refractory layer often cause signal attenuation and distortion due to their excessive thickness and high dielectric constant, resulting in smaller working area or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/00H01B7/295H01B3/28C08L83/04
Inventor 曲文波张德顺王星唐家梓忻济民
Owner SHANGHAI ELECTRIC CABLE RES INST
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