CN215577754U - B1-grade ultra-soft mineral insulated cable - Google Patents

Abstract

The utility model discloses a B1-grade ultra-soft mineral insulated cable which comprises an insulated wire core, wherein a first flame-retardant wrapping tape layer, a mineral fireproof isolation layer, a second flame-retardant wrapping tape layer and a B1-grade halogen-free low-smoke flame-retardant polyolefin sheath are sequentially arranged on the outer side of the insulated wire core. Above-mentioned technical scheme adopts 5 types of copper conductors that fine copper monofilament of stranded formed through the transposition, the metal isolation layer that the compound area of aluminium-plastic formed around the package, the soft state mineral fire prevention isolation layer that forms is crowded to wrap by the compound fire retardant of montmorillonite, make the finished cable have the characteristics that bending radius is little and the compliance is good, be convenient for lay the installation, adopt metal isolation layer, mineral fire prevention isolation layer and B1 level halogen-free low smoke flame retardant polyolefin sheath as the protection skin in proper order, be fit for using under the higher place and the environment of fire prevention requirement, it is superior to have fire prevention and B1 level fire behavior, the compliance is better, long length, processing is convenient, the characteristics of being convenient for to lay.

Description

B1-grade ultra-soft mineral insulated cable

Technical Field

The utility model relates to fire fighting equipment, in particular to a B1-grade ultra-soft mineral insulated cable.

Background

In recent years, in order to improve the safety level of an electric line and reduce the occurrence and loss of electric fire accidents, the national ministry of construction, the public security department and some local governments have issued some electric design specifications in succession, and clearly stipulate that mineral insulated cables are popularized and used in some important electric lines or places. Mineral insulated cable products occupy a certain market in fire-fighting electric lines, and the market demand is continuously increased every year.

The information shows that the fire-resistant cable and the mineral insulated cable wiring can be suitable for places with fire-resistant requirements in the civil buildings, and the fire-resistant cable and the mineral insulated cable should have the flame-retardant performance not lower than B1 level, which is proposed in GB 51348-.

Chinese patent document CN109300583A discloses a mineral insulation flame-retardant fire-resistant cable. The cable comprises a conductor, an A insulating layer, a B insulating layer, a fire-isolating layer, a wrapping tape and an outer sheath layer. The conductor is wrapped into wire cores through an external insulating layer, and gaps among the wire cores arranged in a bundled mode are filled with fire insulation layers. The fire-proof layer is restrained by the wrapping tape wound outside in a circular shape according to the cross section, and the wrapping tape is externally provided with an outer sheath layer. The external insulating layer of the conductor is of a double-layer structure, the inner layer is an A insulating layer, and the outer layer is an B insulating layer. The fire-retardant layer and the fire-retardant layer are alternately sleeved with the second insulating layer and the outer sheath layer, wherein the second insulating layer and the outer sheath layer are made of inorganic mineral fire-resistant materials, the first insulating layer and the second insulating layer are made of low-smoke halogen-free polyolefin, and the fire-retardant layer are alternately sleeved with each other. According to the technical scheme, only the requirement on fire resistance is considered, the fire resistance design is carried out on the structure of the cable, indexes such as heat release characteristics, smoke release characteristics, dropping flammability, smoke toxicity and the like under the fire condition are not considered, and the requirement of a using unit on the B1-level combustion grade cannot be met.

Disclosure of Invention

The utility model mainly solves the technical problem that the original mineral insulated cable can not meet the requirement of B1 level combustion grade, and provides a B1 level super-soft mineral insulated cable which adopts a 5-class copper conductor formed by twisting a plurality of strands of fine copper monofilaments, a metal isolation layer formed by wrapping an aluminum-plastic composite tape, and a soft mineral fireproof isolation layer formed by mixing and extruding magnesium hydroxide and montmorillonite, so that the finished cable has the characteristics of small bending radius and good flexibility and is convenient to lay and install.

The technical problem of the utility model is mainly solved by the following technical scheme: the cable comprises an insulating cable core, wherein a first flame-retardant wrapping tape layer, a mineral fireproof isolation layer, a second flame-retardant wrapping tape layer and a B1-grade halogen-free low-smoke flame-retardant polyolefin sheath are sequentially arranged on the outer side of the insulating cable core. Meets the requirements for class B1 combustion rating. The outer sheath is formed by extruding and wrapping B1-grade halogen-free low-smoke flame-retardant polyolefin sheath material. The mineral fireproof isolation layer and the halogen-free low-smoke flame-retardant polyolefin sheath are sequentially used as the protective outer layer, indexes such as heat release characteristics, smoke release characteristics, droppings flammability, smoke toxicity and the like of the finished cable under a fire condition meet the requirements specified by the standard, the fireproof effect is good, and the cable has the functions of shielding and moisture prevention and is suitable for being used in places and environments with higher fireproof requirements.

Preferably, the insulated wire core comprises a copper conductor located in the center of the insulated wire core, the surface of the copper conductor is coated with a mineral tape insulating layer, and a ceramic polyolefin insulating layer is arranged on the outer side of the mineral tape insulating layer. The ceramic polyolefin insulating layer has excellent fireproof and fireproof characteristics, can be quickly fired into a hard, compact and complete ceramic shell at a high temperature of over 600 ℃ or under flame, the shell is not melted, cracked or dropped at a high temperature for a long time, erosion of external high temperature and flame to internal materials can be effectively isolated, and the excellent fire-insulating and heat-insulating effects are achieved.

Preferably, the number of the insulated wire cores is 1 to 5, and mineral ropes are filled between the insulated wire cores and the first flame-retardant wrapping tape layer. According to different application environments, different numbers of insulated wire cores are respectively arranged to meet the requirement of a user on electric quantity transmission, and resource waste is avoided while transmission efficiency is guaranteed. The filled mineral rope ensures the flexibility of the cable while insulating, so that the cable has small bending radius and good flexibility.

Preferably, a metal isolation layer is arranged between the first flame-retardant belting layer and the mineral fireproof isolation layer. The metal isolation layer is used for increasing the intensity of cable, prevents that the cable from receiving the exogenic action and damaging.

Preferably, the copper conductor is formed by twisting a plurality of strands of copper monofilaments with the diameter of 0.10 mm-0.61 mm. When guaranteeing power transmission efficiency, reduce the pliability of copper conductor simultaneously to increase copper conductor's flexibility through the transposition, avoid external force to lead to the copper conductor to damage.

Preferably, the mineral tape insulating layer is formed by lapping mica tapes with the thickness of 0.14-0.17 mm. The mica tape is a high-performance mica insulation product, and the wrapped mineral tape insulation layer has excellent high-temperature resistance and combustion resistance.

Preferably, the metal isolation layer is formed by lapping an aluminum-plastic composite tape with the thickness of 0.1 mm-0.3 mm. The aluminum-plastic composite belt is formed by coating ethylene-methacrylic acid copolymer resin on two surfaces of an aluminum-based belt A, B to achieve a certain bonding degree, and has shielding and moisture-proof functions.

Preferably, the mineral fireproof isolation layer is formed by extruding and wrapping montmorillonite composite flame retardant. The mineral fireproof isolation layer can absorb a large amount of heat after being heated, and is hardened to form a hard shell, so that the effect of preventing heat propagation through flame isolation is achieved, and the fireproof isolation layer is formed.

The utility model has the beneficial effects that: adopt 5 types of copper conductors that stranded fine copper monofilament formed through the transposition, the metal isolation layer that the compound area of plastic-aluminum was formed around the package, the soft state mineral fire prevention isolation layer that forms is crowded to wrap by magnesium hydroxide, the montmorillonite mixes, make the finished cable have the characteristics that bending radius is little and the compliance is good, be convenient for lay the installation, adopt metal isolation layer, mineral fire prevention isolation layer and B1 level halogen-free low smoke flame retardant polyolefin sheath as the protection skin in proper order, be fit for using under the higher place and the environment of fire prevention requirement, it is superior to have fire prevention and B1 level fire behavior, the compliance is better, long length, processing is convenient, the characteristics of being convenient for to lay. .

Drawings

Figure 1 is a cross-sectional view of the present invention.

In the figure, 1 copper conductor, 2 mineral belt insulating layers, 3 ceramic polyolefin insulating layers, 4 mineral ropes, 5 first flame-retardant wrapping belt layers, 6 metal isolating layers, 7 mineral fireproof isolating layers, 8 second flame-retardant wrapping belt layers and 9B 1-grade halogen-free low-smoke flame-retardant polyolefin sheath.

Detailed Description

The technical scheme of the utility model is further specifically described by the following embodiments and the accompanying drawings.

Example (b): the super gentle mineral insulated cable of B1 level of this embodiment, as shown in fig. 1, including the insulation core, the insulation core outside is equipped with fire-retardant band layer 5 of first fire-retardant band layer, mineral fire prevention isolation layer 7, the fire-retardant band layer 8 of second and the fire-retardant polyolefin sheath 9 of zero halogen low smoke of B1 level in proper order. A metal isolation layer 6 is arranged between the first flame-retardant belting layer 5 and the mineral fireproof isolation layer 7. The metal isolation layer 6 is formed by lapping an aluminum-plastic composite tape with the thickness of 0.1 mm-0.3 mm. The metal isolation layer is used for increasing the intensity of cable, prevents that the cable from receiving the exogenic action and damaging. The aluminum-plastic composite belt is formed by coating ethylene-methacrylic acid copolymer resin on two surfaces of an aluminum-based belt A, B to achieve a certain bonding degree, and has shielding and moisture-proof functions.

The mineral fireproof isolation layer 7 is formed by extruding and wrapping montmorillonite composite flame retardant. The mineral fireproof isolation layer can absorb a large amount of heat after being heated, and is hardened to form a hard shell, so that the effect of preventing heat propagation through flame isolation is achieved, and the fireproof isolation layer is formed. The mineral fireproof isolation layer 7 is formed by extruding montmorillonite composite flame retardant obtained by mixing magnesium hydroxide and montmorillonite.

The insulated wire core comprises a copper conductor 1 positioned in the center of the insulated wire core, and the copper conductor 1 is formed by stranding a plurality of strands of copper monofilaments with the diameter of 0.10 mm-0.61 mm. When guaranteeing power transmission efficiency, reduce the pliability of copper conductor simultaneously to increase copper conductor's flexibility through the transposition, avoid external force to lead to the copper conductor to damage. The surface of the copper conductor 1 is coated with a mineral tape insulating layer 2, and the mineral tape insulating layer 2 is formed by lapping a mica tape with the thickness of 0.14-0.17 mm. The mica tape is a high-performance mica insulation product, and the wrapped mineral tape insulation layer has excellent high-temperature resistance and combustion resistance.

The outer side of the mineral tape insulating layer 2 is provided with a ceramic polyolefin insulating layer 3. The ceramic polyolefin insulating layer has excellent fireproof and fireproof characteristics, can be quickly fired into a hard, compact and complete ceramic shell at a high temperature of over 600 ℃ or under flame, the shell is not melted, cracked or dropped at a high temperature for a long time, erosion of external high temperature and flame to internal materials can be effectively isolated, and the excellent fire-insulating and heat-insulating effects are achieved.

The insulating sinle silk is 1 to 5, according to the application environment of difference, sets up the insulating sinle silk of different quantity respectively in order to satisfy the user to the requirement of electric quantity transmission, avoids the wasting of resources when guaranteeing transmission efficiency. The mineral rope 4 is filled between the insulating wire core and the first flame-retardant belting layer 5, and the flexibility of the cable is ensured when the filled mineral rope is insulated, so that the bending radius of the cable is small, and the flexibility is good.

During the use, the cable can absorb a large amount of heats after the mineral fire prevention isolation layer is heated in combustion process to take place the sclerosis and form hard shell, play the effect that flame isolation stopped the heat propagation, form the fire prevention isolation layer. The ceramic polyolefin insulating layer has excellent fireproof and fireproof characteristics, can be quickly fired into a hard, compact and complete ceramic shell at a high temperature of over 600 ℃ or under flame, the shell is not melted, cracked or dropped at a high temperature for a long time, erosion of external high temperature and flame to internal materials can be effectively isolated, and the excellent fire-insulating and heat-insulating effects are achieved. The cable is a 5-class copper conductor formed by twisting a plurality of strands of fine copper monofilaments, a metal isolating layer formed by wrapping an aluminum-plastic composite tape and a soft mineral fireproof isolating layer formed by mixing and extruding magnesium hydroxide and montmorillonite, so that the finished cable has the characteristics of small bending radius and good flexibility, the bending radius is less than or equal to 6D, and the laying and installation are convenient.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although terms such as insulated wire core, fire retardant tape layer, mineral fire barrier layer, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (7)

1. The utility model provides a super gentle mineral insulated cable of B1 level, its characterized in that, includes the insulation core, the insulation core outside is equipped with first fire-retardant band layer (5), mineral fire prevention isolation layer (7), the fire-retardant band layer of second (8) and the fire-retardant polyolefin sheath of B1 level halogen-free low smoke (9), be equipped with metal isolation layer (6) between first fire-retardant band layer (5) and mineral fire prevention isolation layer (7).

2. The B1-grade ultra-flexible mineral insulated cable according to claim 1, wherein the insulated wire core comprises a copper conductor (1) at the center of the insulated wire core, the surface of the copper conductor (1) is coated with a mineral tape insulating layer (2), and a ceramic polyolefin insulating layer (3) is arranged outside the mineral tape insulating layer (2).

3. The B1-grade ultra-flexible mineral insulated cable according to claim 1, wherein the number of the insulated wire cores is 1 to 5, and mineral ropes (4) are filled between the insulated wire cores and the first flame-retardant belting layer (5).

4. The grade B1 ultra-soft mineral insulated cable according to claim 2, wherein the copper conductor (1) is formed by stranding stranded copper monofilaments with a diameter of 0.10 mm-0.61 mm.

5. The B1-grade ultra-flexible mineral insulated cable according to claim 2, wherein the mineral tape insulating layer (2) is formed by wrapping mica tapes with a thickness of 0.14 mm-0.17 mm.

6. The B1-grade ultra-flexible mineral insulated cable according to claim 1, wherein the metal isolation layer (6) is formed by wrapping an aluminum-plastic composite tape with a thickness of 0.1 mm-0.3 mm.

7. The B1-grade ultra-flexible mineral insulated cable of claim 1, wherein the mineral fire-proof isolation layer (7) is extruded from montmorillonite composite flame retardant.

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