CN215265672U

CN215265672U - Mineral insulated cable

Info

Publication number: CN215265672U
Application number: CN202121243755.6U
Authority: CN
Inventors: 胡湘华; 李华斌; 马辽林; 聂磊; 熊硕
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-12-21
Anticipated expiration: 2031-06-04

Abstract

The utility model discloses a mineral insulated cable, which comprises a conductor body formed by twisting a plurality of conductors together, and a ceramic silicon rubber belt wrapping and a ceramic polyolefin sheath layer outside the conductor body; the lead comprises a conductor, a mica tape layer, an insulating layer and a quartz net layer from inside to outside; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, and the quartz mesh layer is woven outside the mica tape layer. And glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package. The utility model discloses a mica tape is insulating, ceramic silicon rubber, ceramic polyolefin, quartz are woven, have good high temperature resistant, insulating properties, can vitrify after the burning and play the guard action, play the supporting role when ceramic silicon rubber or polyolefin pottery, avoid cracked. By reasonably designing the interlayer structure of the cable and optimizing the ingredients, the insulativity, the flame retardance and the fire resistance of the cable are greatly improved, and the comprehensive mechanical property and the electrical safety property are obviously improved.

Description

Mineral insulated cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a mineral insulated cable.

Background

The mineral insulated cable can be applied to areas with fire-fighting requirements such as high-rise buildings, superstores, subways and the like, the existing mineral insulated cable adopts a mode of magnesium oxide plus a copper sheath or a stainless steel sheath, or a mode of fire mud prevention and fire insulation, or a mode of mica tape insulation plus an embossed copper sheath, or a mode of ceramic polyolefin or ceramic silicone rubber as insulation or a sheath, the cable with the copper sheath or the stainless steel sheath is hard to bend, the fire mud is easy to embrittle after being used for a long time, the embossed copper sheath can not bear small bending radius and multiple bending, the sheath is easy to crack, the mineral insulation produced by the ceramic silicone rubber or the ceramic polyolefin can be bent repeatedly at normal temperature, the cable has no difference from a conventional cable and has good high temperature resistance, the cable can be vitrified to play a protection role after being burnt, but the ceramic silicone rubber or the polyolefin is subjected to internal and external stresses to a greater or lesser extent in the actual use process, the flame-retardant fire-resistant material is easy to crack after burning, difficult to pass the spray test specified by BS6387, and has a larger risk if a fire disaster occurs even if the test is passed.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the invention provides the mineral insulated cable, which greatly improves the physical and mechanical properties of the cable after fire-resistant combustion by reasonably designing the interlayer structure of the cable, has high flexibility in normal use, and obviously improves the comprehensive performance and the electrical safety performance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a mineral insulated cable comprises a conductor body formed by twisting a plurality of conductors together, and a ceramic silicon rubber tape wrapping and ceramic polyolefin sheath layer outside the conductor body; the lead comprises a conductor, a mica tape layer, an insulating layer and a quartz net layer from inside to outside; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, and the quartz mesh layer is woven outside the mica tape layer. Wherein the insulating layer is one or two compositions of ceramic silicon rubber and ceramic polyolefin; the ceramic silicon rubber consists of methyl vinyl silica gel and composite ceramic powder; the ceramic polyolefin consists of low-smoke halogen-free polyolefin and ceramic powder.

As a further improvement of the above technical solution:

and glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package.

The conductor is formed by twisting a single copper conductor or a plurality of copper conductors.

The quartz net layer is formed by weaving quartz wires, and the weaving density is 30-85%.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a mica tape is insulating, ceramic silicon rubber, ceramic polyolefin, quartz are woven, have good high temperature resistant, insulating properties, can vitrify after the burning and play the guard action, play the supporting role when ceramic silicon rubber or polyolefin pottery, avoid cracked. Can pass the spray test of BS 6387.

2. Through rational design cable interlayer structure and optimization, the physical and mechanical properties after the fire-resistant burning of cable has been improved greatly, and cable flexibility is high when normal use, comprehensive properties and electricity security performance are showing and are improving, compare in traditional power cable interlayer structure, this application has selectively increased mica tape layer and quartz mesh layer, framework supports between the excellent layer is provided for cable structure, not only the binding power is effectual with anti deformation, mechanical properties and structural stability have been improved greatly, the lamellar structure layer of high specific surface area has been provided simultaneously, the interlaminar reaction degree of combining is high, the space coupling power is strong.

Drawings

Fig. 1 is a schematic structural diagram of the mineral insulated cable of the present invention.

Reference numerals: 1. a conductor; 2. a mica tape or ceramic silicone rubber tape layer; 3. an insulating layer; 4. A quartz mesh layer; 5. glass fiber yarns; 6. wrapping a ceramic silicon rubber belt; 7. a ceramic polyolefin jacket layer.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined with the following description to clearly and completely describe the technical solution in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Example 1:

as shown in fig. 1, the mineral insulated cable of this embodiment includes a conductor body formed by twisting 4 conductors together, and a ceramic silicone rubber tape wrapping and a ceramic polyolefin sheath layer outside the conductor body; glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package; the lead comprises a conductor formed by twisting single copper conductors from inside to outside, a mica tape layer, a ceramic silicon rubber extrusion bag and a quartz net layer; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, the quartz screen layer is woven outside the mica tape layer by adopting quartz wires, and the weaving density is 80%.

Example 2:

as shown in fig. 1, the mineral insulated cable of this embodiment includes a conductor body formed by twisting 4 conductors together, and a ceramic silicone rubber tape wrapping and a ceramic polyolefin sheath layer outside the conductor body; glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package; the lead comprises a conductor formed by stranding a plurality of silver-plated copper leads with the diameter of 2mm from inside to outside, a mica tape layer, a ceramic polyolefin extrusion package and a quartz net layer; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, the quartz screen layer is woven outside the mica tape layer by adopting quartz wires, and the weaving density is 85%.

Example 3:

as shown in fig. 1, the mineral insulated cable of this embodiment includes a conductor body formed by twisting 4 conductors together, and a ceramic silicone rubber tape wrapping and a ceramic polyolefin sheath layer outside the conductor body; glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package; the lead comprises a conductor formed by stranding a plurality of copper leads with the diameter of 0.29mm from inside to outside, a mica tape layer, a ceramic silicon rubber or ceramic polyolefin composition extrusion coating and a quartz net layer; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, the quartz screen layer is woven outside the mica tape layer by adopting quartz wires, and the weaving density is 82.5%.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A mineral insulated cable characterized by: the cable comprises a conductor body formed by twisting a plurality of conductors together, and a ceramic silicon rubber tape wrapping and ceramic polyolefin sheath layer outside the conductor body; the lead comprises a conductor, a mica tape layer, an insulating layer and a quartz net layer from inside to outside; the mica tape layer is wrapped outside the conductor, the insulating layer is extruded outside the mica tape layer, and the quartz mesh layer is woven outside the mica tape layer.

2. Mineral-insulated cable according to claim 1, characterized in that: and glass fiber yarns are filled between the lead body and the ceramic silicon rubber belt winding package.

3. Mineral-insulated cable according to claim 1, characterized in that: the conductor is formed by twisting a single copper conductor or a plurality of copper conductors.

4. Mineral-insulated cable according to claim 1, characterized in that: the quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.