CN210896652U

CN210896652U - Mineral insulated cable with copper core and copper sheath of 3kV or below

Info

Publication number: CN210896652U
Application number: CN201922425288.8U
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: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-06-30
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses a 3kV reaches following copper core copper sheath mineral insulated cable relates to the mineral insulated cable field, for reaching above-mentioned purpose, the technical scheme of the utility model from interior to exterior including conductor, insulating layer, copper sheath and oversheath, the conductor with the insulating layer forms the cable core, the cable core is including a plurality of roots, and each cable core transposition each other in an organic whole, it has magnesium oxide crystal powder insulating layer to fill between the cable core, copper sheath inner wall is equipped with helical structure's interior spine. Can effectively resist flame and maintain the integral strength.

Description

Mineral insulated cable with copper core and copper sheath of 3kV or below

Technical Field

The utility model relates to a 3kV and following copper core copper sheathing mineral insulated cable mainly relates to the mineral insulated cable field.

Background

In recent years, urban rail transit in China is rapidly developed (including subways, ground light rails and overhead light rails), and compared with other transportation means, the urban rail transit has the characteristics of high driving speed, large passenger transportation amount and the like, and is an effective method for solving urban traffic congestion at present. According to the statistics of the national committee, the investment of urban traffic in China reaches 8000 million yuan during fifteen days, the total length of the passed items of rail traffic is 650 kilometers, wherein the construction of subways is at least 2000 million yuan, and the use amount of halogen-free (low-halogen) low-smoke flame-retardant waterproof (ultraviolet-proof and termite-proof) power cables in the construction of rail traffic is larger. Such cables need to have excellent flame retardant effect, require better water resistance simultaneously, and the current cable is difficult to satisfy this requirement.

SUMMERY OF THE UTILITY MODEL

Not enough to above prior art, the utility model provides a 3kV reaches following copper core copper sheathing mineral insulated cable can be effectual fire-retardant keep bulk strength through keeping, keep apart outside water that can be good through the copper sheathing.

In order to achieve the above purpose, the technical scheme of the utility model is that: the cable comprises a conductor, an insulating layer, a copper sheath and an outer sheath from inside to outside, wherein the conductor and the insulating layer form a cable core, the cable core comprises a plurality of cable cores, the cable cores are mutually twisted into a whole, a magnesium oxide crystal powder insulating layer is filled between the cable cores, and the inner wall of the copper sheath is provided with an inner ridge with a spiral structure.

The technical principle and the beneficial effects of the utility model are as follows:

intertwist the cable core each other in this scheme can show the whole closely knit degree that improves the cable core in an organic whole, set up magnesium oxide crystal powder insulating layer simultaneously between the cable core and can release the crystal water when the cable burns, absorb a large amount of heat, simultaneously, dehydration reaction can produce a large amount of water vapor, and it can dilute combustible gas, prevents the burning. Improve holistic flame retardant efficiency, set up helical structure's interior spine simultaneously in the copper sheathing, can improve the holistic intensity of copper sheathing, avoid receiving radial pressure the time, very easy quilt flattens. The copper sheath can well isolate external water.

Preferably, the insulating layer is polyvinyl chloride, so that a better insulating effect can be achieved.

Preferably, the outer sheath is extruded outside the copper sheath, and the outer sheath is arranged on the outer surface of the copper sheath, so that the copper sheath can be effectively isolated from outside corrosion, and the copper sheath is prevented from rusting and corroding.

Preferably, the outer sheath is made of thermoplastic resin, has good low-temperature resistance and high-temperature resistance and good chemical stability, conforms to most places needing acid-base corrosion, is insoluble in common chemical solvents at normal temperature, has small water absorption and excellent electrical insulation performance, and can well protect the copper sheath from being corroded.

Preferably, the inner wall of the copper sheath is provided with a graphite coating, and the graphite coating has good heat conducting property, can quickly transfer heat to the periphery, and avoids fire hazard after heat is gathered.

Preferably, the direction of the cable core twisting is the same as the spiral direction of the inner ridge, so that the structure of the cable core twisting is matched with the copper sheath more firmly in a temperature-resistant manner.

Drawings

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

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

The cable comprises a conductor 1, an insulating layer 2, an outer sheath 3, an inner ridge 4 and a copper sheath 5.

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 embodiment of the present invention includes from inside to outside:

conductor 1: a copper-core conductor 1.

Insulating layer 2: insulating layer 2 is polyvinyl chloride, can have better insulating effect.

Copper sheath 5: the outer sheath 3 is extruded to the outside of the copper sheath 5, and is arranged on the outer surface of the copper sheath 5 through the outer sheath 3, so that the copper sheath 5 can be effectively isolated from the outside in a corrosion manner, and the rusting and corrosion of the copper sheath 5 are avoided.

Outer sheath 3: the outer sheath 3 is made of thermoplastic resin material, has good low-temperature resistance and high-temperature resistance, has good chemical stability, conforms to most occasions needing acid-base corrosion resistance, is insoluble in common chemical solvents at normal temperature, has small water absorption and excellent electrical insulation performance, and can well protect the copper sheath 5 from being corroded.

The inner wall of the copper sheath 5 is provided with the graphite coating which has good heat conducting performance, heat can be rapidly transmitted to the periphery, and fire disasters after heat is gathered are avoided.

The direction of the cable core twisting is the same as the spiral direction of the inner ridge 4, so that the structure of the cable core twisting is matched with the copper sheath 5 more firmly at a higher temperature.

The conductor 1 and the insulating layer 2 form a cable core, the cable core comprises a plurality of cable cores, the cable cores are mutually twisted into a whole, the insulating layer 2 made of magnesium oxide crystal powder is filled between the cable cores, and the inner wall of the copper sheath 5 is provided with an inner ridge 4 with a spiral structure.

The cable cores are mutually twisted into a whole, so that the overall compactness of the cable cores can be remarkably improved, meanwhile, the magnesium oxide crystal powder insulating layer 2 is arranged between the cable cores, crystal water can be released when the cable burns, a large amount of heat is absorbed, meanwhile, a large amount of water vapor can be generated in a dehydration reaction, and combustible gas can be diluted to prevent burning. Improve holistic flame retardant efficiency, set up helical structure's interior spine 4 simultaneously in copper sheathing 5, can improve the holistic intensity of copper sheathing 5, avoid receiving radial pressure the time, very easily by flattening.

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

1.3kV and following copper core copper sheath (5) mineral insulated cable, its characterized in that, by interior to including conductor (1), insulating layer (2), copper sheath (5) and oversheath (3) outward, conductor (1) with insulating layer (2) form the cable core, the cable core is including a plurality of, and each cable core twists each other in an organic whole, it has magnesium oxide crystal powder insulating layer (2) to fill between the cable core, copper sheath (5) inner wall is equipped with inner spine (4) of helical structure.

2. 3kV and below copper core copper sheath (5) mineral insulated cable according to claim 1, characterized in that: the insulating layer (2) is made of polyvinyl chloride.

3. 3kV and below copper core copper sheath (5) mineral insulated cable according to claim 1, characterized in that: the outer sheath (3) is extruded outside the copper sheath (5).

4. 3kV and below copper core copper sheath (5) mineral insulated cable according to claim 1, characterized in that: the outer sheath (3) is made of thermoplastic resin material.

5. 3kV and below copper core copper sheath (5) mineral insulated cable according to claim 1, characterized in that: the inner wall of the copper sheath (5) is provided with a graphite coating.

6. 3kV and below copper core copper sheath (5) mineral insulated cable according to claim 1, characterized in that: the twisting direction of the cable core is the same as the spiral direction of the inner ridge (4).