CN219476343U

CN219476343U - Flexible mineral insulated cable

Info

Publication number: CN219476343U
Application number: CN202320077091.3U
Authority: CN
Inventors: 何志勇; 游海宁; 邱树宏
Original assignee: Guangzhou Cable Works Co Ltd
Current assignee: Guangzhou Cable Works Co Ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-08-04
Anticipated expiration: 2033-01-09

Abstract

The utility model discloses a flexible mineral insulated cable, which comprises a plurality of stranded wire cores, a copper sheath wrapping the periphery of the stranded wire cores, a sheath layer wrapping the periphery of the copper sheath, and a filling layer filled between the wire cores and the copper sheath, wherein each wire core comprises a copper conductor and an insulating sleeve wrapping the periphery of the copper conductor, and the copper conductor adopts two types of stranded conductors; according to the utility model, the copper conductor is adopted as a second class stranded conductor, so that the flexibility of the copper conductor is increased; the insulation sleeve is insulated by the mica tape, so that the insulation performance of the cable can be improved, and short circuit is avoided in the bending process; the filling layer adopts magnesium oxide, and has the effects of flame retardance, fire resistance and insulation; the copper sheath has a fireproof effect, can be used as a ground wire when a short circuit occurs, generates a reflux effect, and can locate a fault point; therefore, the flexibility of the cable is improved, and the problem of short circuit in the bending process of the cable is avoided.

Description

Flexible mineral insulated cable

Technical Field

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

Background

The BTTZ cable is also called a mineral insulated cable, is a copper conductor core wire wrapped by a copper sheath, and is mainly used for the functions of ignition, water resistance, corrosion resistance and the like. In practice, the BTTZ cable adopts magnesia powder as an inorganic insulating material to separate the lead from the sleeve, and the outermost layer can be selected as appropriate to use a protective shell according to the requirement. The rigid mineral insulated cable BTTZ consists of a conductor, magnesium oxide insulation and a copper sheath, and the combustion performance of the product can reach A level.

However, the rigid mineral insulated cable has the advantages that the conductors are single conductors and are not stranded, so that the product is hard, the bending radius is large in the laying process, the conductors are easy to short-circuit when laid at the corners, and particularly when the conductors are all short-circuited, fault points cannot be positioned, so that the whole cable is scrapped.

Disclosure of Invention

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

In order to solve the technical problems, the technical scheme of the utility model is as follows: the flexible mineral insulated cable comprises a plurality of stranded wire cores, a copper sheath wrapping the periphery of the stranded wire cores, a sheath layer wrapping the periphery of the copper sheath, and a filling layer filled between the wire cores and the copper sheath, wherein each wire core comprises a copper conductor, an insulating sleeve wrapping the periphery of the copper conductor, and the copper conductor adopts two types of stranded conductors.

Preferably, the copper conductor is made of one of brass, red copper, tin-plated copper or silver-plated copper.

Preferably, the filling layer is a magnesium oxide filling layer and a plurality of refractory ropes arranged inside the magnesium oxide filling layer.

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

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

Preferably, the sheath layer is a 125-DEG low-smoke halogen-free flame-retardant ceramic thermoplastic elastomer rubber sleeve.

The utility model has the technical effects that: according to the utility model, the copper conductor is adopted as a second class stranded conductor, so that the flexibility of the copper conductor is increased; the insulation sleeve is insulated by the mica tape, so that the insulation performance of the cable can be improved, and short circuit is avoided in the bending process; the filling layer adopts magnesium oxide, and has the effects of flame retardance, fire resistance and insulation; the copper sheath has a fireproof effect, can be used as a ground wire when a short circuit occurs, generates a reflux effect, and can locate a fault point; therefore, the flexibility of the cable is improved, and the problem of short circuit in the bending process of the cable is avoided.

Drawings

Fig. 1 is a block diagram of a flexible mineral insulated cable according to the present utility model.

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.

A flexible mineral insulated cable, as shown in figure 1, comprises a plurality of stranded wire cores 1, a copper sheath 2 wrapping the periphery of the stranded wire cores 1, and specifically, the copper sheath 2 protects the wire cores 1, plays a role in fire resistance, can serve as a ground wire when a short circuit occurs, and can generate a reflux effect to locate a fault point. The copper wire comprises a copper wire core 1, a copper sheath 2, a sheath layer 3 wrapping the periphery of the copper sheath 2, a filling layer 4 filled between the wire core 1 and the copper sheath 2, wherein the wire core 1 comprises a copper conductor 11, an insulating sleeve 12 wrapping the periphery of the copper conductor 11, and the copper conductor 11 adopts two types of stranded conductors. The two kinds of conductors are compressed stranded conductors, the sections of the two kinds of conductors are round, fan-shaped, tile-shaped and the like, the compression coefficient (or filling coefficient) of the two kinds of conductors can reach more than 0.9, namely, the section of a gap is smaller than 10%, the twisted wire core is compressed, the structural stability of the conductors is improved, the outer diameter of the conductors is reduced, and insulation and sheath materials can be reduced, so that the weight and the production cost of a cable are reduced, and the longitudinal water blocking of the conductors is realized.

The copper conductor 11 is made of one of brass, red copper, tin-plated copper or silver-plated copper.

The filling layer 4 is a magnesium oxide filling layer 41 and a plurality of refractory ropes 42 arranged inside the magnesium oxide filling layer 41. Specifically, the flame-retardant, fire-resistant and insulating effects are achieved; magnesium oxide is inorganic nonflammable mineral insulation, so that the combustion performance reaches A level.

The fire-resistant rope 42 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 insulating sleeve 12 is a double-sided synthetic mica tape insulating sleeve. Specifically, the insulation performance of the cable is improved, and short circuit is avoided in the bending process.

The sheath layer 3 is a 125-DEG low-smoke halogen-free flame-retardant ceramic thermoplastic elastomer rubber sleeve. Specifically, the low-smoke halogen-free flame-retardant ceramic thermoplastic elastomer material with the temperature of 125 ℃ can meet the performance under the flame or flameless condition at the temperature of 650 ℃ and above. Along with the temperature rise, the ceramic-shaped hard complete shell is quickly sintered, the longer the burning time is, the higher the temperature is, the harder the shell is, the better the protection effect is played on the circuit by the hard shell after burning, and the smoothness of the circuit under the condition of fire is ensured.

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, characterized by: the cable comprises a plurality of stranded cable cores, a copper sheath wrapping the periphery of the stranded cable cores, a sheath layer wrapping the periphery of the copper sheath, and a filling layer filled between the cable cores and the copper sheath, wherein each cable core comprises a copper conductor wrapping an insulating sleeve on the periphery of the copper conductor, and the copper conductor adopts two types of stranded conductors.

2. A flexible mineral insulated cable according to claim 1, wherein: the copper conductor is made of one of brass, red copper, tin-plated copper or silver-plated copper.

3. A flexible mineral insulated cable according to claim 1, wherein: the filling layer is a magnesium oxide filling layer and a plurality of fire-resistant ropes arranged inside the magnesium oxide filling layer.

4. A flexible mineral insulated cable according to claim 3, wherein: the fire-resistant rope is high-temperature resistant, flame-retardant and fire-resistant PP rope.

5. A flexible mineral insulated cable according to claim 1, wherein: the insulating sleeve is a double-sided synthetic mica tape insulating sleeve.

6. A flexible mineral insulated cable according to claim 1, wherein: the sheath layer is a 125-DEG low-smoke halogen-free flame-retardant ceramic thermoplastic elastomer rubber sleeve.