阅读说明：本技术 一种新型柔性矿物绝缘电缆 (Novel flexible mineral insulated cable ) 是由 蒋绍清 杨磊 侯雯馨 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种新型柔性矿物绝缘电缆,包括缆芯,所述缆芯外围由内至外依次设置有外包带、外护层,所述外包带与缆芯之间间隙填充有防火泥层,所述缆芯包括若干根绞制在一起的线芯,每一线芯包括导体芯和由内至外依次设置在导体芯外围的云母带层、绝缘层,每一导体芯包括若干根绞制在一起的导体。(The invention discloses a novel flexible mineral insulated cable which comprises a cable core, wherein an outer wrapping belt and an outer protective layer are sequentially arranged on the periphery of the cable core from inside to outside, a fireproof mud layer is filled in a gap between the outer wrapping belt and the cable core, the cable core comprises a plurality of twisted wire cores, each wire core comprises a conductor core, a mica tape layer and an insulating layer, the mica tape layer and the insulating layer are sequentially arranged on the periphery of the conductor core from inside to outside, and each conductor core comprises a plurality of twisted conductors.)

1. The utility model provides a novel flexible mineral insulated cable, includes the cable core, its characterized in that, outer band, outer jacket have been set gradually to outer in cable core periphery from interior to exterior, the clearance packing has fire prevention mud layer between outer band and the cable core, the cable core includes a plurality of bunches of sinle silk together, and each sinle silk includes the conductor core and from interior to exterior sets gradually at conductor core outlying mica tape layer, insulating layer, and each conductor core includes a plurality of bunches of conductors together.

2. A novel flexible mineral-insulated cable according to claim 1, characterized in that the fire-resistant coating comprises water glass, clay powder, magnesium hydroxide or aluminium hydroxide.

3. The novel flexible mineral-insulated cable according to claim 2, wherein the weight ratio of the water glass, the clay powder, the magnesium hydroxide or the aluminum hydroxide in the fireproof clay layer is 0.3-0.5:0.3-0.5: 0.5-0.7.

4. A novel flexible mineral insulated cable according to claim 3, characterized in that the weight ratio of water glass, clay powder, magnesium hydroxide or aluminium hydroxide in the fire-proof clay layer is 0.4:0.4: 0.6.

5. The new flexible mineral insulated cable of claim 1, wherein the layer of mica tape comprises a three-in-one synthetic mica tape.

6. A novel flexible mineral insulated cable according to claim 5, characterized in that the mica tape layer is wrapped 2-3 layers.

7. The novel flexible mineral-insulated cable of claim 1, wherein said core comprises four or five wires twisted together.

8. The novel flexible mineral insulated cable of claim 1, wherein the outer tape comprises a glass tape.

9. The novel flexible mineral-insulated cable of claim 1, wherein said outer jacket comprises a uv-resistant low smoke zero halogen sheathing material.

Technical Field

The invention relates to the technical field of cables, in particular to a novel flexible mineral insulated cable.

Background

According to the fire statistics data in recent years published by the fire department of public security, the electric fire accounts for about 30 percent of the total number, and more than 40 percent of the fires caused by various types of electricity are caused by cables. In recent years, the fire disasters of a plurality of domestic large public entertainment places, chemical engineering, coal mines and commercial buildings cause great loss of lives and properties of people, so that people have more profound understanding on fire fighting and fire prevention safety; fire-retardant, fire-resistant class wire and cable that used commonly in the past still appear many times in civil buildings fire accident to the flue gas toxicity that releases when the cable burns causes obvious secondary damage to the human body, so mineral insulation class cable arouses people's concern and enters into the use.

At present, the domestic mineral insulated cable has the following three mainstream products in the current market:

1. insulating copper sheath magnesium oxide: the main model numbers are BTTZ and BTTVZ.

2. Insulating + aluminium sheath, fire prevention mud isolation layer, the flexible mineral cable of oversheath structure in multilayer inorganic mineral band: the main models are BTLY, WDZAN-BTLY, NG-A and the like.

3. BBTRZ flexible mineral insulation cable: the main model is BBTRZ.

However, the existing mineral insulated cable generally has the problems of unreasonable structure, difficult installation, easy damp of a joint, lower voltage grade than the domestic low-voltage grade, high manufacturing cost and the like, and the bending performance and high fire resistance requirements are difficult to meet higher requirements.

Disclosure of Invention

The present invention aims to solve the above-mentioned problems by providing a new flexible mineral-insulated cable, which addresses the above-mentioned deficiencies and drawbacks of the prior art.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

the utility model provides a novel flexible mineral insulated cable, includes the cable core, its characterized in that, outer band, outer jacket have been set gradually to outer in cable core periphery from interior to exterior, the clearance packing has fire prevention mud layer between outer band and the cable core, the cable core includes a plurality of bunches of sinle silk together, and each sinle silk includes the conductor core and from interior to exterior sets gradually at conductor core outlying mica tape layer, insulating layer, and each conductor core includes a plurality of bunches of conductors together.

In a preferred embodiment of the invention, the fire-retardant clay layer comprises water glass, clay powder, magnesium hydroxide or aluminum hydroxide.

In a preferred embodiment of the invention, the weight ratio of the water glass, the clay powder, the magnesium hydroxide or the aluminum hydroxide in the fireproof mud layer is 0.3-0.5:0.3-0.5: 0.5-0.7.

In a preferred embodiment of the invention, the weight ratio of the water glass, the clay powder, the magnesium hydroxide or the aluminum hydroxide in the fireproof mud layer is 0.4:0.4: 0.6.

In a preferred embodiment of the invention, the mica tape layer comprises a three-in-one synthetic mica tape.

In a preferred embodiment of the invention, the mica tape is wrapped with 2-3 layers.

In a preferred embodiment of the invention, the cable core comprises four or five wire cores twisted together.

In a preferred embodiment of the invention, the overwrap tape comprises a glass ribbon.

In a preferred embodiment of the present invention, the outer sheath comprises a uv-resistant low smoke zero halogen sheath material.

Due to the adoption of the technical scheme, the cable core structure is reasonably designed, and the flexible materials are adopted from the conductor to the outer sheath, so that the flexibility of the cable is ensured, the minimum bending radius can reach 8D, and the cable is more flexible than other mineral insulated cables. The product of the invention can pass the highest fire-resistant grade specified by BS6387 or BS8491 standard, has small smoke amount and does not cause secondary damage to human body. The invention has the advantages of good flexibility, reliable fire resistance, long production length, easy installation, proper voltage grade and the like, does not need special accessories for special moisture-proof treatment for the middle and terminal joints, and is more suitable for the characteristics of small space and more bending when cables are installed and laid in China.

Drawings

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

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

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.

Referring to fig. 1, the novel flexible mineral insulated cable includes a cable core 100, an outer tape 10 and an outer sheath 20 are sequentially disposed on the periphery of the cable core 100 from inside to outside, a fireproof mud layer 30 is filled in a gap between the outer tape 10 and the cable core 100, the cable core 100 includes a plurality of twisted wire cores 110, each wire core 110 includes a conductor core 111, and a mica tape layer 112 and an insulating layer 113 sequentially disposed on the periphery of the conductor core 111 from inside to outside, and each conductor core 111 includes a plurality of twisted conductors.

In the embodiment, the fire-proof mud layer 30 comprises water glass, argil powder, magnesium hydroxide or aluminum hydroxide, the weight ratio of the water glass, the argil powder, the magnesium hydroxide or the aluminum hydroxide in the fire-proof mud layer is 0.3-0.5:0.3-0.5:0.5-0.7, and preferably, the weight ratio of the water glass, the argil powder, the magnesium hydroxide or the aluminum hydroxide in the fire-proof mud layer is 0.4:0.4: 0.6. The mica tape layer 112 comprises three-in-one synthetic mica tapes, the mica tape layer 112 is wrapped by 2-3 layers, the cable 100 comprises four or five wire cores 110 which are twisted together, and the outer wrapping tape 10 comprises a glass tape.

The improvement points of the invention are mainly embodied in the following aspects:

(1) the concrete structure of the product is that a copper conductor is wrapped with 2-3 layers of mica tapes concentrically, the core technology in the structure of the product is that a mica tape layer 112 and an insulating layer 113 are used for continuously extruding a fireproof mud layer 30, so that the mica tape is protected to be stable in structure under the condition of flame, and the product can bear certain spraying and vibration. The fire-proof mud layer 30 can be decomposed to generate a large amount of water vapor under the flame condition, so that the flame temperature can be reduced, and the cable core can be protected from being melted.

(2) The mica tape layer 112 in the invention comprises a three-in-one synthetic mica tape, does not contain crystal water, has a melting point of 1375 ℃, has good high temperature resistance, is suitable for a fire-resistant temperature of 950-. The mica tape layer 112 not only has a fire-resistant function, but also has an insulation function, and the insulation resistivity of the material is very high, so that the insulation resistance of the insulation layer can be effectively improved.

(3) The fireproof mud layer 30 made of inorganic mineral substances is used as a filling and fireproof protective layer of the cable, and a large amount of water vapor can be generated when the fireproof mud layer 30 is burnt, so that the flame temperature is effectively reduced.

(4) Because the fireproof mud layer 30 is not shaped when just coming out of the die orifice and is easy to deform under external force, the cable is not round, and particularly the cable is easy to overflow from the band gap when being extruded on a take-up reel, the fireproof mud layer 30 utilizes the optimal proportion and adopts an extrusion type nylon die to ensure that the fireproof mud layer 30 fills the cable core gap of the multi-core cable as much as possible, so that the thickness outside the cable core gap is reduced as much as possible, and the rounding degree of the cable is ensured.

(5) The insulating layer 113 separates the mica tape layer 112 and the fireclay layer 30, and prevents water in the fireclay layer 30 from permeating into the mica tape layer 112 to lower its insulation resistance.

The main detection indexes of the product are as follows:

the main index project completion condition comparison table of the invention is as follows

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.