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Direct-current 1500V halogen-free polyolefin flexible cable for rail transit

A rail transit and polyolefin technology, applied in the direction of insulated cables, power cables, flexible cables, etc., can solve the problems of core damage and cable twisting, etc., to achieve good protection and improve anti-twist performance.

Active Publication Date: 2021-02-23
居盛文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the existing soft cables for rail transit are made of soft materials in order to meet better bending properties, which makes the cables prone to twisting, and the twisting is easy to cause damage to the core

Method used

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  • Direct-current 1500V halogen-free polyolefin flexible cable for rail transit
  • Direct-current 1500V halogen-free polyolefin flexible cable for rail transit
  • Direct-current 1500V halogen-free polyolefin flexible cable for rail transit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 A DC 1500V halogen-free polyolefin flexible cable for rail transit shown, including a cable core, an inner sheath 8, a flame-retardant layer 9 and an outer sheath 10, which are sequentially sheathed from the inside to the outside, combined with figure 1 and figure 2 , the cable core includes a rubber tube 2 on the axis, an inner helical chain 3 helically wound along the length direction of the rubber tube 2, support bars 4 that are helically and equidistantly distributed along the length direction of the rubber tube 2, and along the length of the cable core The direction of the outer helical chain 7 spirally wound on the outside of the support bar 4, the central straight-through cavity 1 is opened on the axis of the rubber tube 2, the support bar 4 and the rubber tube 2 are integrally formed, and the inside of the support bar 4 is provided with The cavity connected to the central straight-through cavity 1, the support bar 4 is located between two adja...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is:

[0031] In this embodiment, the support strips 4 are arranged in rows at equal intervals along the circumference of the rubber tube 2, and the number of rows is equal to the number of wire cores 6; Distribution, each of the wire cores 6 is helically wound on the outside of the inner helical chain 3 along the length direction of the rubber tube 2 (not shown in the figure). The wire core 6 is helically wound on the outside of the inner helical chain 3. Compared with the straight wire core, the helical wire core 6 can rotate on the basis of its helical structure when the cable is twisted, so that it can The torsion of the main body of the core 6 is reduced, thereby improving the torsional performance of the cable.

[0032] Others are with embodiment 1.

[0033] The specific working principle of the above-mentioned DC 1500V halogen-free polyolefin flexible cable for rail transit is as follows:

[0034]Both the ...

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PUM

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Abstract

The invention discloses a direct-current 1500V halogen-free polyolefin flexible cable for rail transit, and belongs to the technical field of cables. The flexible cable comprises cable cores, an innersheath, a flame-retardant layer and an outer sheath, each cable core comprises a rubber tube, an inner spiral chain, a supporting strip and an outer spiral chain, a central straight-through cavity isformed in the axis of the rubber tube, and a cavity communicated with the central straight-through cavity is formed in the supporting strip. One wire core is arranged between every two adjacent supporting strips, the rotating direction of the outer spiral chain is opposite to the rotating direction of the inner spiral chain, the inner spiral chain and the outer spiral chain each comprise verticalbuckling rings and transverse buckling rings, the vertical buckling rings and the transverse buckling rings are arranged alternately and intermittently, and each vertical buckling ring and the transverse buckling rings located on the two sides of the vertical buckling ring are buckled together. The inner sheath and the outer sheath are both made of a cross-linked halogen-free low-smoke flame-retardant polyolefin material. The flexible cable has good flame retardant property, meets the requirements of low smoke, no halogen, no toxicity and the like, has excellent torsion resistance and good bending property, and meets the use requirements of rail transit design departments on the cable.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a DC 1500V halogen-free polyolefin flexible cable for rail transit. Background technique [0002] Rail transit is a part of railway electrification. Its locomotives need to be driven by electric power. The power supply system of rail transit requires a large number of DC and AC power cables. 1500V DC traction cables are a main variety. DC cables for rail transit are laid in densely populated areas. public places, and has been in a special environment of underground humidity for a long time, so the safety and reliability of the cables used are very high. The subway design department clearly stipulates that the cables must meet the requirements of halogen-free, low-smoke, flame-retardant, waterproof, oil-resistant, weather-resistant, etc. Performance requirements, due to the narrow laying space, the cable also needs to be soft and have a small bending radius to meet special use requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/18H01B7/04H01B7/295H01B9/00
CPCH01B7/18H01B7/185H01B7/1805H01B7/1815H01B7/1875H01B7/295H01B7/04H01B9/00
Inventor 居盛文
Owner 居盛文