CN219591157U

CN219591157U - B1-level flame-retardant mineral composite insulation corrugated copper sheath fireproof cable

Info

Publication number: CN219591157U
Application number: CN202320537208.1U
Authority: CN
Inventors: 陈梦; 许军; 周勇华; 王立; 吴晴; 郑瑜; 余洪涛; 陈梦迪; 王皓予
Original assignee: Aerospace Electric Group Co ltd; Aerospace Rich Cable Co ltd
Current assignee: Aerospace Electric Group Co ltd; Aerospace Rich Cable Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-08-25
Anticipated expiration: 2033-03-20

Abstract

The utility model discloses a B1-level flame-retardant mineral composite insulating corrugated copper sheath fireproof cable which comprises an insulating wire core, a plurality of insulating wire cores, a protective layer, a metal sheath layer, an oxygen isolation layer and a nonmetallic outer sheath layer, wherein the insulating wire core is formed by an annealing copper conductor, a mica tape insulating layer which is wrapped on the outer side of the annealing copper conductor, the insulating wire cores and a filling rope are mutually twisted to form a cable core, the protective layer is wrapped on the outer side of the cable core, the metal sheath layer is longitudinally wrapped on the outer side of the protective layer, the oxygen isolation layer is extruded on the outer side of the metal sheath layer, and the nonmetallic outer sheath layer is extruded on the oxygen isolation layer. Through the combined action of the metal sheath, the oxygen barrier layer and the nonmetal sheath, the flame retardant grade of the cable can reach the current highest combustion grade B1, the combustion drop/particle grade is d0, the smoke toxicity grade reaches t0, and the corrosiveness grade reaches a 1.

Description

B1-level flame-retardant mineral composite insulation corrugated copper sheath fireproof cable

Technical Field

The utility model relates to the technical field of wires and cables, in particular to a B1-level flame-retardant mineral composite insulation corrugated copper sheath fireproof cable.

Background

The B1 class flame retardant rating is derived from GB 31247-2014 class of Cable and Cable Combustion Performance, which standards classify the class of Cable Combustion into A, B, B2 and B3 classes. GB/T51348-2019, electrical design Standard for civil architecture, 8.9.1, states that: the fire-resistant cable and the mineral insulated cable wiring can be suitable for places with fire-resistant requirements in civil buildings. The fire-resistant cable and the mineral-insulated cable should have flame retardancy not lower than the B1 level. The standard is released, and the application of the B1-level mineral insulated cable is widened. At present, places with more applications of the products are places with dense personnel, such as rail transit, markets, hospitals and the like.

Disclosure of Invention

In order to widen the application problem of the B1-level mineral insulated cable, the utility model provides a B1-level flame-retardant mineral composite insulated corrugated copper sheath fireproof cable.

The technical scheme of the utility model is as follows: a B1-level flame-retardant mineral composite insulation corrugated copper sheath fireproof cable comprises an insulation wire core, a plurality of insulation wire cores, a protection layer, a metal sheath layer, an oxygen isolation layer and a nonmetal outer sheath layer, wherein the insulation wire core is formed by an annealing copper conductor, a mica tape insulation layer which is wrapped on the outer side of the annealing copper conductor, the insulation wire cores and a filling rope are mutually twisted to form a cable core, the protection layer is wrapped on the outer side of the cable core, the metal sheath layer is longitudinally wrapped on the outer side of the protection layer, the oxygen isolation layer is extruded on the outer side of the metal sheath layer, and the nonmetal outer sheath layer is extruded on the oxygen isolation layer.

As a further improvement of the above technical scheme:

preferably, the annealed copper conductor is the 1 st or 2 nd metal-plated or non-metal-plated annealed copper conductor in GB/T3956-2008.

Preferably, the mica tape insulating layer comprises any one of a double-sided synthetic mica tape, a calcined mica tape and a ceramic mica tape, and the nominal thickness is 0.45-2.2 mm.

Preferably, the filling rope comprises any one of a flame-retardant high-temperature filling rope, a glass fiber filling rope and a flame-retardant PP filling rope, and the filling requirement is compact and round.

Preferably, the lapping rate of the protective layer wrapping is 25-35%, and the nominal thickness of the protective layer wrapping is 0.6-0.8 mm.

Preferably, the metal sheath layer is longitudinally wrapped by a copper strip, the copper strip is produced and embossed by a welding process, and the nominal thickness of the metal sheath layer is 0.4-0.7 mm.

Preferably, the nonmetallic outer sheath layer adopts low-smoke halogen-free flame retardant polyolefin, and the nominal thickness is more than or equal to 1.4mm.

Preferably, the mica tape insulating layer is provided with a marking layer.

Compared with the prior art, the utility model has the following beneficial effects:

the metal sheath is longitudinally wrapped outside the protective layer by adopting the copper strip, and the copper strip is produced and embossed by adopting a welding process, and the melting point of copper reaches 1083.4 ℃, so that the internal structure can be effectively protected from being influenced in the combustion process; the oxygen-isolating layer is made of high flame-retardant material and is extruded on the surface of the metal sheath, oxygen can be isolated in the combustion process to play a flame-retardant role, the nonmetal sheath is extruded outside the oxygen-isolating layer by adopting low-smoke halogen-free flame-retardant polyolefin material, the nonmetal sheath can be closely attached to the surface of the oxygen-isolating layer in the extrusion process, the inner layer structure is protected from cracking in the porcelain process, and the flame-retardant grade of the cable can reach the current highest combustion grade B1 by the combined action of the metal sheath, the oxygen-isolating layer and the nonmetal sheath, the combustion drop/particle grade is d0, the smoke toxicity grade reaches t0, and the corrosiveness grade reaches a 1.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the overall structure of the present utility model.

Reference numerals: 1. annealing the copper conductor; 2. a mica tape insulating layer; 3. a filling rope; 4. a protective layer; 5. a metal sheath layer; 6. an oxygen barrier layer; 7. a nonmetallic outer jacket layer; 8. a marking layer.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that, in terms of "front", "rear", "left", "right", "upper", "lower", etc., the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, which are merely for convenience in describing the present utility model and simplifying the description, but are not meant to indicate or imply that the devices or elements to be referred to must have specific directions, be configured and operated in specific directions, and thus should not be construed as limiting the present utility model, the technical solutions of the embodiments of the present utility model may be combined, and the technical features of the embodiments may also be combined to form a new technical solution.

The utility model provides the following technical scheme:

as shown in figure 1, the cable provided by the utility model comprises the following layers from inside to outside in sequence:

1. annealing the barrel conductor; the annealed copper conductor 1 is the 1 st or 2 nd metal-plated layer or the non-metal-plated layer annealed copper conductor 1 in GB/T3956-2008.

2. A mica tape insulating layer 2; the mica tape insulating layer 2 is wrapped on the outer side of the annealed copper conductor 1, and consists of proper mica tapes according to different products, a general product can adopt double-sided synthetic mica tapes, a low-smoke zero-halogen low-toxicity product can adopt calcined mica tapes, ceramic mica tapes and the like, the nominal thickness of the mica tape insulating layer is 0.45-2.2 mm, and an insulating wire core is formed by the annealed cylinder conductor and the mica tape insulating layer 2;

3. a filling rope 3; the filling rope 3 and a plurality of insulating wire cores are mutually twisted to form a cable core, the material adopted by the filling rope 3 is suitable for the running temperature of a cable, is compatible with the cable insulating material and the protective layer 4 material, and is compact and round in filling, such as a flame-retardant high-temperature filling rope 3, a glass fiber filling rope 3, a flame-retardant PP filling rope 3 and the like.

4. A protective layer 4; the protective layer 4 is wrapped on the outer side of the cable core, is composed of a proper flame-retardant strip (such as a low-smoke halogen-free high-flame-retardant strip, a mica tape and the like), is suitable for the running temperature of the cable and is compatible with the cable insulating material; the material used for filling is suitable for the operation temperature of the cable, is compatible with the cable insulation material and the material of the protective layer 4, the covering rate of the wrapping of the protective layer 4 is 25-35%, and the nominal thickness is 0.6-0.8 mm.

5. A metal sheath layer 5; the metal sheath is a copper strip longitudinally wrapped outside the protective layer 4, the metal sheath meets the requirements of copper strips in T2M or TU2M brands in GB/T2059-2008, the copper strip is produced and embossed by adopting a welding process, the embossing depth and the pitch are uniform, welding is not leaked, the welding is firm and reliable, the welding seam is smooth, the product is ensured not to crack under the condition of an allowable bending radius, no obvious oxidation phenomenon occurs after the welding is finished, the nominal thickness of the metal sheath is 0.4-0.7 mm, and the internal structure can be effectively protected from being influenced in the combustion process because the melting point of copper reaches 1083.4 ℃.

6. An oxygen barrier layer 6; the oxygen isolation layer 6 is made of high flame retardant material and is extruded on the surface of the metal sheath by adopting a technical method, so that oxygen can be isolated in the combustion process to play a flame retardant role;

7. a nonmetallic outer sheath layer 7; the low-smoke halogen-free flame-retardant polyolefin material has a minimum nominal thickness of 1.4mm, can be tightly attached to the surface of the oxygen-isolating layer 6 by adopting a specific die and an extrusion process, and can be used for protecting an inner layer structure from cracking in the process of burning;

through the combined action of the metal sheath, the oxygen isolation layer 6 and the nonmetal sheath, the flame retardant grade of the cable can reach the current highest combustion grade B1, the combustion drop/particle grade is d0, the smoke toxicity grade reaches t0, and the corrosiveness grade reaches a 1.

For the convenience of distinguishing the cable core, the mica tape insulating layer 2 is provided with marking layers 8 of different colors.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A B1-level flame-retardant mineral composite insulating corrugated copper sheath fireproof cable is characterized in that: the cable comprises an annealing copper conductor (1), an insulating wire core formed by a mica tape insulating layer (2) wrapping the outer side of the annealing copper conductor (1), a plurality of insulating wire cores and a filling rope (3) which are mutually twisted to form a cable core, a protective layer (4) wrapping the outer side of the cable core, a metal sheath layer (5) longitudinally wrapping the protective layer (4), an oxygen isolation layer (6) wrapping the metal sheath layer (5) in an extrusion mode, and a nonmetal outer sheath layer (7) wrapping the oxygen isolation layer (6) in an extrusion mode.

2. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the annealed copper conductor (1) is the 1 st or 2 nd metal-plated layer or non-metal-plated layer annealed copper conductor (1) in GB/T3956-2008.

3. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the mica tape insulating layer (2) comprises any one of a double-sided synthetic mica tape, a calcined mica tape and a ceramic mica tape, and the nominal thickness is 0.45-2.2 mm.

4. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the filling rope (3) comprises any one of a flame-retardant high-temperature filling rope (3), a glass fiber filling rope (3) and a flame-retardant PP filling rope (3), and the filling requirement is compact and round.

5. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the lapping rate of the protection layer (4) is 25-35%, and the nominal thickness is 0.6-0.8 mm.

6. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the metal sheath layer (5) is longitudinally wrapped by a copper strip, the copper strip is produced and embossed by a welding process, and the nominal thickness of the metal sheath layer (5) is 0.4-0.7 mm.

7. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: the nonmetallic outer sheath layer (7) adopts low-smoke halogen-free flame retardant polyolefin, and the nominal thickness is more than or equal to 1.4mm.

8. The B1 stage flame retardant mineral composite insulated corrugated copper jacketed fireproof cable of claim 1, wherein: and a marking layer (8) is arranged on the mica tape insulating layer (2).