Mineral insulation B1-level cable

Abstract

The utility model relates to the technical field of insulated cables, and provides a mineral insulated B1-level cable, which aims at solving the problems of unstable conductive effect or poorer mineral insulated or flame-retardant effect of the conventional mineral insulated cable, and comprises a plurality of mineral insulated wire cores which are spirally wound, the outer layer of the plurality of mineral insulation wire cores is wrapped by a composite protection layer. The mineral insulated wire core comprises a plurality of strands of conductors, and the outer layer of the plurality of strands of conductors is sequentially wrapped by a mineral insulated layer and a flame-retardant layer. The mineral insulated B1-level cable provided by the utility model can simultaneously have good conductivity and stability of the cable, and mineral insulativity and flame retardance of the cable in buildings or industrial equipment and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of insulated cables, in particular to a mineral insulated B1 class cable. Background Art

[0002] Mineral insulated cable is a type of power cable whose insulation layer uses mineral insulation materials instead of traditional plastic or rubber materials. Common mineral insulation materials include rock wool, aluminum silicate, etc. These materials have good fire resistance and flame retardant properties, can remain stable at high temperatures, and effectively prevent the spread of fire. Furthermore, according to GBT 19666-2019 "General Rules for Flame Retardant and Fire Resistant Wires and Cables or Optical Cables", the flame retardant grades of cables are divided into four grades: ZA, ZB, ZC, and ZD; GB 31247-2014 "Classification of Combustion Performance of Cables and Optical Cables", the flame retardant grades of cables are divided into four grades: A, B1, B2, and less than B2. Among them, B1-grade cables have higher flame retardant properties, can slow down the spread of fire when a fire occurs, and improve the fire safety of buildings and facilities. They are often used in buildings and industrial facilities.

[0003] For example, the patent with announcement number CN220604360U provides a mineral insulated B1 grade cable, including multiple cores and a sheath for wrapping the cores, characterized in that: the structure of the core is provided with a conductor, a protective layer, a mineral insulation layer, a first fire insulation layer, and an inner protective layer from the inside to the outside, a filler is provided in the gap between the cores, and the sheath is provided with a second fire insulation layer and an outer protective layer from the inside to the outside.

[0004] However, the existing mineral insulated cables have the following problems: either the conductive effect of the cable is unstable, or the mineral insulation or flame retardant effect of the cable is poor. Therefore, there is an urgent need for a cable with good mineral insulation and flame retardant properties and stable conductivity. Utility Model Content

[0005] The purpose of the utility model is to solve the problems of existing mineral insulated cables, that is, the conductive effect of the cable is unstable, or the mineral insulation or flame retardant effect of the cable is poor. The application provides a mineral insulated B1 grade cable, which can have both good conductivity and stability of the cable, as well as mineral insulation and flame retardancy of the cable in buildings or industrial equipment.

[0006] The utility model is realized by the following technical solutions:

[0007] A mineral insulated B1 grade cable comprises a plurality of mineral insulated cores which are spirally wound and coated with a composite protective layer on the outer layer; the mineral insulated cores comprise a plurality of conductors, and the outer layers of the plurality of conductors are sequentially coated with a mineral insulating layer and a flame retardant layer.

[0008] Furthermore, the outer wall surfaces of each of the two adjacent mineral insulated cores are in contact with each other, so that the cross-section of the several mineral insulated cores is circular; and the axis of the several mineral insulated cores is penetrated by a conductor.

[0009] Furthermore, a heat insulation layer is provided around the outer periphery of the conductive wire.

[0010] Furthermore, fillers are provided between the several mineral insulated cores and the composite protective layer, and between the multiple conductors and the mineral insulating layer.

[0011] Furthermore, along the direction from the axis of the cable to the outer layer, the composite protective layer includes a first protective layer, a fireproof insulation layer, an armor layer, and a second protective layer which are sequentially wrapped.

[0012] Furthermore, an armor layer is also sandwiched between the first protective layer and the fireproof insulation layer.

[0013] The technical solution of the utility model has the following beneficial effects:

[0014] The mineral insulated B1 class cable of the utility model improves the structure of the cable conductor and the coating such as the protective material arranged on the outside thereof, so that the manufactured cable can have both the good electrical conductivity and stability of the cable, as well as the mineral insulation and flame retardancy of the cable in buildings or industrial equipment, etc., and has better environmental adaptability and longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 Schematic diagram of the cross-sectional structure of the mineral insulated Class B1 cable in Example 1;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the mineral insulated wire core in Example 1.

[0018] Icon: 11- multi-strand conductor, 12- mineral insulation layer, 13- flame retardant layer, 14- conductor, 15- thermal insulation layer, 2- filler, 31- first protective layer, 32- fireproof insulation layer, 33- armor layer, 34- second protective layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] Example 1

[0023] like Figure 1 to Figure 2 As shown, this embodiment provides a mineral insulated B1 grade cable, including a plurality of mineral insulated cores, the plurality of mineral insulated cores are spirally wound, and the outer layers of the plurality of mineral insulated cores are coated with a composite protective layer; the mineral insulated cores include a plurality of conductors 11, and the outer layers of the plurality of conductors 11 are sequentially coated with a mineral insulation layer 12 and a flame retardant layer 13.

[0024] The multi-strand conductor 11 refers to the twisted multi-strand wire 14, which can prevent it from being loose, so as to maintain the stability of the conductive performance of the cable.

[0025] In this embodiment, the outer wall surfaces of every two adjacent mineral insulated cores are in contact with each other, so that the cross-sections of the several mineral insulated cores are circular; and the conductors 14 are passed through the axes of the several mineral insulated cores.

[0026] In this embodiment, a heat insulation layer 15 is provided around the outer periphery of the conductive wire 14 .

[0027] In this embodiment, the mineral insulation layer 12 can adopt the existing mica material with good comprehensive electrical insulation performance; the flame retardant layer 13 adopts fire-proof silicon micropowder material, and sodium silicate is added and stirred to form a colloid, which is wrapped around the outer surface of the mineral insulation layer 12 of the multi-strand conductor 11 by extrusion equipment, etc., which exerts a flame retardant effect by isolating oxygen; the heat insulation layer 15 adopts cross-linked polyethylene material, which has excellent heat resistance, insulation performance and chemical corrosion resistance.

[0028] In this embodiment, a filler 2 is provided between several mineral insulated cores and the composite protective layer, and a highly flame-retardant filling rope is used; a filler 2 is also provided between the multi-strand conductor 11 and the mineral insulating layer 12, and a flexible filler 2 is used.

[0029] In this embodiment, along the direction from the axis of the cable to the outer layer, the composite protective layer includes a first protective layer 31, an armor layer 33, a fireproof insulation layer 32, an armor layer 33, and a second protective layer 34 which are sequentially wrapped.

[0030] In this embodiment, the protective layer can be made of halogen-free low-smoke flame-retardant B1 grade polyolefin material; the armor layer 33 can be made of galvanized steel strip or stainless steel strip, etc.; the fireproof insulation layer 32 can be made of mineral insulation materials with good fire resistance such as rock wool and aluminum silicate.

[0031] In this embodiment, the mineral insulated B1 grade cable improves the structure of the cable conductor and the coating such as the protective material arranged on the outside, so that the manufactured cable can have both good electrical conductivity and stability of the cable. After long-term use, it can still maintain the B1 grade mineral insulated cable performance standard required by GB 31247-2014 "Classification of Combustion Performance of Electric Cables and Optical Cables", as well as the mineral insulation and flame retardancy of the cable in buildings or industrial equipment, and has better environmental adaptability and longer service life.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mineral insulated B1 class cable, characterized in that: It comprises a plurality of mineral insulated wire cores, the plurality of mineral insulated wire cores are spirally wound, and the outer layers of the plurality of mineral insulated wire cores are covered with a composite protective layer; The mineral insulated wire core comprises a plurality of conductors (11), the outer layers of which are sequentially covered with a mineral insulation layer (12) and a flame retardant layer (13).

2. The mineral insulated B1 class cable according to claim 1, characterized in that: The outer wall surfaces of each of the two adjacent mineral insulated cores are in contact with each other, so that the cross-section of the several mineral insulated cores is circular; A conductor (14) is passed through the axis of the plurality of mineral insulated wire cores.

3. The mineral insulated B1 class cable according to claim 2, characterized in that: The outer periphery of the conductive wire (14) is provided with a heat insulating layer (15).

4. The mineral insulated B1 class cable according to claim 1, characterized in that: Fillers (2) are provided between the several mineral insulated wire cores and the composite protective layer, and between the multi-strand conductor (11) and the mineral insulating layer (12).

5. The mineral insulated B1 class cable according to any one of claims 1 to 4, characterized in that: Along the direction from the axis of the cable to the outer layer, the composite protective layer comprises a first protective layer (31), a fireproof insulating layer (32), an armor layer (33), and a second protective layer (34) which are sequentially wrapped.

6. The mineral insulated B1 class cable according to claim 5, characterized in that: An armor layer (33) is also sandwiched between the first protective layer (31) and the fireproof insulation layer (32).

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