CN219085694U

CN219085694U - Flexible mineral insulated cable of unified package type

Info

Publication number: CN219085694U
Application number: CN202223163968.5U
Authority: CN
Inventors: 何志勇
Original assignee: Guangzhou Cable Works Co Ltd
Current assignee: Guangzhou Cable Works Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-05-26
Anticipated expiration: 2032-11-25

Abstract

The utility model discloses a unified wrapping type flexible mineral insulated cable, which comprises a wire set formed by twisting a plurality of wires, wherein the periphery of the wire set is sequentially wrapped with a first layer of flame-retardant wrapping tape, flame-retardant mud extruded on the periphery of the first layer of flame-retardant wrapping tape, a second layer of flame-retardant wrapping tape and an outer sheath, a plurality of refractory materials are filled between the wire set and the flame-retardant wrapping tape, the wires comprise conductors, and the periphery of each conductor is sequentially wrapped with a polyester tape, a mica tape and an aluminum sheath extruded on the periphery of the mica tape; according to the utility model, the aluminum sheath is extruded on the periphery of the conductor, so that the problem of large section caused by wrapping the aluminum sheath on the outer layer of the lead set is solved, and the aluminum sheath and the wire core are bent simultaneously during bending, so that the aluminum sheath does not need to be bent first and is easy to bend; and secondly, the periphery of the lead group is wrapped by fire-proof mud, and the fire-proof mud is wrapped by an aluminum sheath, so that the fire resistance of the fire-proof mud can reach 950 ℃, the fire resistance can be effectively realized, and breakdown is not easy to occur.

Description

Flexible mineral insulated cable of unified package type

Technical Field

The utility model relates to the technical field of cable manufacturing, in particular to a uniformly-wrapped flexible mineral insulated cable.

Background

BTLY is a mineral insulated cable with fireproof function, each letter represents the material of different structures, wherein B represents wiring, material is mineral insulated cable, T represents inner core conductor, material is copper, L represents metal sleeve, material is aluminum, Y represents cable's outer sheath, and is polyvinyl chloride material. The BTLY cable has wide application range and is often used for main lines, fire-fighting lines, escape and rescue systems, such as emergency lighting, fire monitoring, alarm systems, elevator systems, smoke discharging systems, control lines and the like, and the BTLY cable covers industries of business, hospitals, supermarkets, industrial and mining, real estate and the like; the BTLY product adopts a uniformly-wrapped mineral insulated cable, and not only the whole cable is wrapped by a metal aluminum sheath, but also the phase-separated mineral insulated cable is adopted, but the fire resistance is common.

Disadvantages and shortcomings of the prior art: firstly, the existing unified package type cable uses metal aluminum jackets which are directly welded on the outer layers of a wire group, so that the section is larger, in the bending process, the aluminum jackets are bent firstly and then are bent to the wire cores in the wire group, and because gaps exist between the wire cores and the aluminum jackets, the bending radius is too small, and the aluminum jackets are difficult to bend, the unified package type cable is inconvenient to install in places needing bending and is also unfavorable for cable storage; secondly, the existing uniformly-wrapped cable is free of fire mud, so that in the combustion process, the melting point of aluminum is lower than 950 ℃, the standards of BS6387 and BS8491 cannot be met, flame is directly combusted on a metal aluminum sheath at the high temperature of 950 ℃, and because the melting point of the metal aluminum sheath is lower than 950 ℃, breakdown is easy to generate in the combustion process.

Disclosure of Invention

In view of this, it is an object of the present utility model to provide a flexible mineral insulated cable of the all-around type.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the wire winding device comprises a wire group formed by winding a plurality of wires, wherein the periphery of the wire group is sequentially wrapped with a first layer of flame-retardant winding tape, flame-retardant mud extruded on the periphery of the first layer of flame-retardant winding tape, a second layer of flame-retardant winding tape and an outer sheath, a plurality of refractory materials are further filled between the wire group and the flame-retardant winding tape, the wire comprises a conductor, and the periphery of the conductor is sequentially wrapped with a polyester tape, a mica tape and an aluminum sheath extruded on the periphery of the mica tape.

Preferably, the conductor is a compacted copper conductor.

Preferably, the mica tape is a double-sided synthetic mica tape.

Preferably, the first layer of flame-retardant wrapping tape and the second layer of flame-retardant wrapping tape are both glass fiber tapes.

Preferably, the refractory material is a high-temperature resistant flame-retardant PP rope.

Preferably, the outer sheath is a low smoke zero halogen flame retardant cross-linked polyolefin elastomer sheath.

The utility model has the technical effects that: according to the utility model, the aluminum sheath is extruded on the periphery of the conductor, so that the problem of large section caused by wrapping the aluminum sheath on the outer layer of the lead set is solved, and the aluminum sheath and the wire core are bent simultaneously during bending, so that the aluminum sheath does not need to be bent first and is easy to bend; and secondly, the periphery of the lead group is wrapped by fire-proof mud, and the fire-proof mud is wrapped by an aluminum sheath, so that the fire resistance of the fire-proof mud can reach 950 ℃, the fire resistance can be effectively realized, and breakdown is not easy to occur.

Drawings

Fig. 1 is a block diagram of a flexible mineral insulated cable of the utility model in a unified package.

Detailed Description

The following detailed description of the utility model is provided in connection with the accompanying drawings to facilitate understanding and grasping of the technical scheme of the utility model.

In this embodiment, it should be understood that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "top", "right", "left", "upper", "back", "middle", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present utility model, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In this embodiment, if not specifically described, the members may be connected or fixed by bolts, pins, or the like, which are commonly used in the prior art, and therefore, the details thereof will not be described in this embodiment.

The utility model provides a flexible mineral insulated cable of a packet formula, as shown in fig. 1, includes that a plurality of wires 1 are twisted around the wire group 2 that forms, the periphery of wire group 2 has wrapped gradually first layer fire-retardant around band 3, extrudes at first layer fire-retardant around band 3 outlying fire prevention mud 4, second floor fire-retardant around band 5 and oversheath 6, still pack a plurality of refractory materials 7 between wire group 2 and the fire-retardant around band 3, wire 1 includes conductor 11, the periphery of conductor 11 has wrapped gradually polyester tape 12, mica tape 13, and extrudes at the peripheral aluminium sheath 14 of mica tape 13. Specifically, the fireproof mud 4 is prepared by mixing sodium silicate glue and magnesium hydroxide powder in proportion (the proportion is glue 42: powder 70), and mixing and stirring in an internal mixer for 7-8 minutes; the fire-retardant cement is characterized in that under the condition of high temperature, the fire-retardant cement is hardened, and a fire-retardant effect is achieved. Meanwhile, the aluminum extrusion is similar to the insulating extrusion process in principle, welding is not needed, an aluminum sheath with uniform thickness is directly extruded, the aluminum sheath is wrapped on a wire core, and the smaller the section is, the faster the production speed is. Specifically, the polyester tape 12 is mainly used for dampproof and insulating, and when moisture exists, the polyester tape 12 can effectively prevent the moisture from penetrating to the conductor and generating oxidation blackening. Specifically, the aluminum sheath 14 is a metal aluminum sheath, the adopted process mode is a smooth aluminum structure, the production process is an aluminum coating process, the aluminum coating process is to heat an aluminum rod to a semi-molten state, and an aluminum pipe with uniform extrusion thickness is sleeved on the mica tape 13 of the lead 1.

The conductor 11 is a compacted copper conductor. The mica tape 13 is a double-sided synthetic mica tape. Specifically, the mica tape 13 has a three-in-one mica tape and a double-sided synthetic mica tape, and the double-sided synthetic mica tape is selected, and the number of wrapping layers is selected, so that wrapping is performed according to different structures; the overlapping rate is kept at 10% -15%, when the overlapping rate is too high, the winding is easy to damage, the mica tape is damaged, mica is easy to drop when the mica tape is subjected to a fire resistance test, and the fire resistance performance cannot be achieved.

The flame-retardant wrapping belt 5 is a glass fiber belt. Specifically, the glass fiber tape material is used as the flame-retardant wrapping tape 5, so that the flame-retardant wrapping tape has a flame-retardant effect, and when the glass fiber is subjected to high temperature, the glass fiber is carbonized and attached to the surface, so that a flame-retardant effect is achieved.

The refractory material 7 is a high-temperature-resistant flame-retardant PP rope. Specifically, the flame-retardant filling rope has a certain flame-retardant effect, is non-flammable, and only generates carbonization phenomenon when being subjected to high temperature.

The outer sheath 6 is a low-smoke halogen-free flame-retardant cross-linked polyolefin elastomer sheath. Specifically, the B1-level flame-retardant polyolefin adopted by the outer sheath 6 is characterized in that no dripping matters are generated in the combustion process, the heat release amount is low, and the B1-level combustion performance can be achieved.

Of course, the above is only a typical example of the utility model, and other embodiments of the utility model are also possible, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of the utility model claimed.

Claims

1. A flexible mineral insulated cable of a system package type, characterized in that: the wire winding device comprises a wire group formed by winding a plurality of wires, wherein the periphery of the wire group is sequentially wrapped with a first layer of flame-retardant winding tape, flame-retardant mud extruded on the periphery of the first layer of flame-retardant winding tape, a second layer of flame-retardant winding tape and an outer sheath, a plurality of refractory materials are further filled between the wire group and the flame-retardant winding tape, the wire comprises a conductor, and the periphery of the conductor is sequentially wrapped with a polyester tape, a mica tape and an aluminum sheath extruded on the periphery of the mica tape.

2. A uniformly wrapped flexible mineral insulated cable according to claim 1, wherein: the conductor is a compacted copper conductor.

3. A uniformly wrapped flexible mineral insulated cable according to claim 1, wherein: the mica tape is a double-sided synthetic mica tape.

4. A uniformly wrapped flexible mineral insulated cable according to claim 1, wherein: the first layer of flame-retardant wrapping tape and the second layer of flame-retardant wrapping tape are both glass fiber tapes.

5. A uniformly wrapped flexible mineral insulated cable according to claim 1, wherein: the refractory material is a high-temperature-resistant flame-retardant PP rope.

6. A uniformly wrapped flexible mineral insulated cable according to claim 1, wherein: the outer sheath is a low-smoke halogen-free flame-retardant crosslinked polyolefin elastomer sheath.