CN210039686U

CN210039686U - Cable with rated voltage of 3kV and below 125 ℃ for railway locomotive

Info

Publication number: CN210039686U
Application number: CN201820521602.5U
Authority: CN
Inventors: 黄美华; 张哲新
Original assignee: CHONGQING KEBAO CABLE CO LTD
Current assignee: CHONGQING KEBAO CABLE CO LTD
Priority date: 2018-04-12
Filing date: 2018-04-12
Publication date: 2020-02-07
Anticipated expiration: 2028-04-12

Abstract

The utility model discloses a rated voltage 3kV reaches following 125 ℃ cable for railway locomotive relates to the cable field, mainly includes from inside to outside in proper order including conductor, cable cream, crosslinked polyethylene insulating layer, copper wire shielding layer, median, fire-retardant layer, aluminium silk armor, insulating layer to realize high fire-retardant, cold resistance is good, and breakdown voltage test surplus is big and nontoxic function.

Description

Cable with rated voltage of 3kV and below 125 ℃ for railway locomotive

Technical Field

The utility model relates to a rated voltage 3kV reaches below 125 ℃ cable for railway locomotive mainly relates to the cable field.

Background

The traditional cable for the railway locomotive adopts a structure that an isolation belt is wrapped on a conductor, single-layer rubber insulation is wrapped, a single-layer rubber sheath is added, a product adopts a steam vulcanization production mode, the product production has high requirements on equipment, the temperature resistance level is low, the outer diameter is large, ultraviolet ray resistance is poor, the aging performance is poor, low temperature of minus 55 ℃ is not resisted, the material for manufacturing the product contains halogen, the breakdown voltage test allowance is small, the flame retardant property of the cable is general, and the insulation and the sheath are easily layered to reduce the oil resistance, the voltage resistance and the cold resistance.

SUMMERY OF THE UTILITY MODEL

The not enough of prior art more than, the utility model provides a 125 ℃ cable for railway locomotive of rated voltage 3kV and following realizes high fire-retardant, and cold resistance is good, and the experimental surplus of breakdown voltage is big and nontoxic effect.

In order to achieve the above purpose, the technical scheme of the utility model is that: the cable comprises a conductor, cable paste, a crosslinked polyethylene insulating layer, a copper wire shielding layer, an isolation belt, a flame retardant layer, an aluminum wire armor and an insulating layer from inside to outside in sequence.

Furthermore, the conductor is a reverse twisted structure of adjacent layers after the tinned copper monofilament is bundled, so that the toughness and the corrosion resistance of the conductor can be effectively improved.

Furthermore, the shielding layer comprises a plurality of copper wires which are uniformly distributed on the crosslinked polyethylene insulating layer in the circumferential direction, so that the electric field on the surface of the conductor can be homogenized, and the phenomenon that the local electric field is concentrated to discharge is prevented.

Furthermore, the isolation belt is subjected to salt bath vulcanization after being tightly extruded, so that the heat transfer performance is excellent, and the vulcanization speed is high.

Further, the aluminum wire armor is a plurality of aluminum wires which are uniformly distributed in the circumferential direction of the flame-retardant layer, and the cable is protected in an all-round mode.

Furthermore, the aluminum wire armor is a reverse compound twisted structure formed by adjacent layers after aluminum single wire bundling, and the integral protection capability is improved.

Further, the flame retardant layer includes an ethylene-vinyl acetate copolymer containing an inorganic flame retardant and a phosphorus-series flame retardant.

Further, the inner layer is low-smoke halogen-free flame-retardant mixed rubber.

The technical principle and the beneficial effects of the utility model are as follows: the cable for the railway locomotive with the rated voltage of 3kV or below 125 ℃ effectively improves the-55 ℃ resistance of the product, has large breakdown voltage test allowance after low temperature resistance test, high cable working temperature and excellent flame retardant property, does not contain halogen in the material for manufacturing the cable, and only generates a small amount of low-smoke and nontoxic gas when the cable for the railway locomotive with the rated voltage of 3kV or below 125 ℃ is burnt compared with a large amount of halogen-containing toxic gas and dense smoke released when a common locomotive wire with the grade of 100 ℃. The aluminum wire armor can play the effect of radial protection enhancement and certain flame retardant efficiency. The cable paste protects the conductor, and improves oil resistance and working temperature.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only two of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

The cable comprises a conductor 1, a cable paste 2, a crosslinked polyethylene insulating layer 3, a copper wire shielding layer 5, an isolation belt 6, a flame-retardant layer 7, an aluminum wire armor 8 and an insulating layer 9.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely preferred embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in fig. 1, the utility model discloses a from inside to outside in proper order including conductor 1, cable cream 2, crosslinked polyethylene insulating layer 3, copper wire shielding layer 5, median 6, fire-retardant layer 7, aluminium silk armor 8, insulating layer 9. The conductor 1 is a reverse twisted structure of adjacent layers after the tinned copper monofilament is bundled, and the toughness and the corrosion resistance of the conductor 1 can be effectively improved.

The shielding layer comprises a plurality of copper wires which are uniformly distributed in the circumferential direction of the crosslinked polyethylene insulating layer 3, so that the electric field on the surface of the conductor 1 can be homogenized, and the phenomenon that the local electric field is concentrated to discharge is prevented. The isolation belt 6 is tightly extruded and then subjected to salt bath vulcanization, so that the heat transfer performance is excellent, and the vulcanization speed is high.

The aluminum wire armor 8 is a plurality of aluminum wires which are uniformly distributed in the circumferential direction of the flame retardant layer 7 and protect the cable in an all-around mode, the aluminum wire armor 8 is a reverse compound twisted structure formed by adjacent layers after aluminum single wires are bundled, the whole protection capability is improved, and the flame retardant layer 7 comprises ethylene-vinyl acetate polymers of inorganic flame retardants and phosphorus series flame retardants. The inner layer is low-smoke halogen-free flame-retardant mixed rubber.

The cable paste 2 protects the conductor 1, improves oil resistance and working temperature, has excellent flame retardant property, and only generates a small amount of low-smoke nontoxic gas when the cable for the railway locomotive with the rated voltage of 3kV and below 125 ℃ is burnt compared with a large amount of halogen-containing toxic gas and dense smoke released when a common locomotive wire with the grade of 100 ℃ burns because the material for manufacturing the cable does not contain halogen. The aluminum wire armor 8 can play the role of radial protection reinforcement and certain flame retardant effect.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The cable for the railway locomotive with the rated voltage of 3kV and below 125 ℃ is characterized by sequentially comprising a conductor, cable paste, a crosslinked polyethylene insulating layer, a copper wire shielding layer, an isolation belt, a flame retardant layer, an aluminum wire armor and an insulating layer from inside to outside; the conductor is a reverse compound twisted structure of the adjacent layers after the tinned copper monofilament bundle is combined; the shielding layer comprises a plurality of copper wires which are uniformly distributed in the circumferential direction of the crosslinked polyethylene insulating layer; performing salt bath vulcanization after the isolation belt is tightly extruded; the aluminum wire armor is formed by uniformly distributing a plurality of aluminum wires which are arranged in the circumferential direction of the flame-retardant layer; the aluminum wire armor is a reverse compound twisted structure formed by adjacent layers after aluminum single wire bundling; the insulating layer is low-smoke halogen-free flame-retardant mixed rubber.