CN215183135U - Super gentle mineral insulated cable - Google Patents

Abstract

The utility model discloses a super gentle mineral insulated cable, include by interior fire-retardant band layer, mineral fire prevention isolation layer, fire-retardant band layer and the fire-retardant polyolefin sheath of steamed low cigarette that sets gradually outside to, fire-retardant band layer inboard is equipped with the sinle silk. Above-mentioned technical scheme adopts the ceramic polyolefin insulating layer, metal isolation layer and mineral fire isolation layer are as the integrated configuration of fire prevention, fire behavior is good, the cable can absorb a large amount of heats after being heated at the mineral fire isolation layer in combustion process, and take place the sclerosis and form hard shell, play the effect that flame isolation prevents heat propagation, form the fire isolation layer, this casing does not melt under long-time high temperature, do not ftracture, do not drip, can effectively keep apart outside high temperature, flame is to the erosion of inside material, play very good fire insulation effect, and bend radius is less than or equal to 6D, have fire behavior superiority, the compliance is better, length is long, processing is convenient, be convenient for lay the characteristics of installation.

Description

Super gentle mineral insulated cable

Technical Field

The utility model relates to a transmission cable technical field especially relates to an 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 an electric fire accident, it is clearly specified that a mineral insulated cable is widely 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.

At present, mineral insulated cables used in the market have two types of rigidity and flexibility, wherein a copper pipe is wrapped outside the rigid mineral insulated cable and is formed by multiple drawing processes and pressing; the flexible mineral insulated cable is rolled into a spiral shape outside the rigid cable copper pipe.

The data show that the two cables are applied to the market for many years, but with the development of times and technological progress, the requirements of modern industrial production on the fire resistance, the flexibility and the length of the cable are greatly improved, particularly under the conditions of subways, power stations, petrochemical engineering, high-rise buildings and the like, the requirement on the fire resistance and the fire resistance of the cable is extremely high, and the service life of the cable is greatly prolonged due to the higher flexibility on the basis of the fire resistance. However, the existing mineral insulated cable processing technology cannot meet the flexibility of the cable on the basis of ensuring the fireproof performance of the cable, so that the traditional mineral insulated cable has a limited use environment.

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. The bending radius of the technical scheme is larger than 12D, and the large-size bending radius is larger, so that the construction is difficult.

Disclosure of Invention

The utility model mainly solves the technical problems that the bending radius of the original mineral insulated cable is larger than 12D and the construction is difficult, provides an ultra-soft mineral insulated cable, adopts a ceramic polyolefin insulating layer, a metal isolating layer and a mineral fireproof isolating layer as a fireproof combined structure, has good fireproof performance, can absorb a large amount of heat after the mineral fireproof isolating layer is heated in the combustion process of the cable, and is hardened to form a hard shell, which has the effect of flame isolation and heat transmission prevention to form a fireproof isolation layer, the shell does not melt, crack or drip at high temperature for a long time, can effectively isolate the erosion of external high temperature and flame to internal materials, plays a good role in fire insulation and heat insulation, and the bending radius is less than or equal to 6D, and the fireproof cable has the characteristics of excellent fireproof performance, better flexibility, long length, convenience in processing and convenience in laying and installation.

The above technical problem of the present invention can be solved by the following technical solutions: the utility model discloses a by interior fire-retardant band layer, mineral fire prevention isolation layer, the fire-retardant band layer of second and the fire-retardant polyolefin sheath of steamed low cigarette that does not have that sets gradually outside to, first fire-retardant band layer inboard is equipped with the sinle silk. The outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin sheath materials. 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 wire core comprises a copper conductor, and a mineral belt insulating layer and a ceramic polyolefin insulating layer which are sequentially arranged outside the copper conductor. 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 cable core is provided with 1 to 5, and mineral ropes are filled between the cable core and the first flame-retardant wrapping band layer. According to different application environments, the wire cores with different quantities are respectively arranged so as to meet the requirements of users on electric quantity transmission, and the transmission efficiency is guaranteed while resource waste is avoided.

Preferably, the mineral fireproof isolation layer is formed by mixing and extruding magnesium hydroxide and montmorillonite. 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.

Preferably, the copper conductor is formed by twisting a plurality of strands of copper monofilaments with the diameter of 0.10-0.61 mm. The power transmission efficiency is guaranteed, the volume of the copper conductor is reduced through twisting, meanwhile, the flexibility of the copper conductor is increased, and the copper conductor is prevented from being damaged by external force.

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.

The utility model has the advantages that: the ceramic polyolefin insulating layer, the metal isolating layer and the mineral fireproof isolating layer are adopted as a fireproof combined structure, and the fireproof performance is good. The cable can absorb a large amount of heats after the mineral fire prevention isolation layer is heated in the 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 characterized in that a 5-class copper conductor formed by stranding a plurality of fine copper monofilaments and a soft mineral fireproof isolation layer formed by mixing and extruding magnesium hydroxide and montmorillonite are adopted, 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.

Drawings

Fig. 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 mineral fireproof isolation layers, 7 second flame-retardant wrapping belt layers and 8 halogen-free low-smoke flame-retardant polyolefin sheaths.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): the super gentle mineral insulated cable of this embodiment, as shown in fig. 1, include the fire-retardant band layer 5 of first fire-retardant band layer, mineral fire prevention isolation layer 6, the fire-retardant band layer 7 of second and the fire-retardant polyolefin sheath of halogen-free low cigarette 8 that sets gradually from inside to outside, first fire-retardant band layer 5 inboard is equipped with the sinle silk. The mineral fireproof isolating layer 6 is formed by mixing and extruding magnesium hydroxide and montmorillonite. 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 outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin sheath materials. 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.

The sinle silk is equipped with 1 to 5, according to the application environment of difference, sets up the 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 sinle silk includes copper conductor 1 and the mineral area insulating layer 2 and the ceramic polyolefin insulating layer 3 that set gradually outside copper conductor 1. 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. Mineral ropes 4 are filled between the wire cores and the first flame-retardant belting layer 5. The copper conductor 1 is formed by stranding a plurality of strands of copper monofilaments with the diameter of 0.10-0.61 mm. The power transmission efficiency is guaranteed, the volume of the copper conductor is reduced through twisting, meanwhile, the flexibility of the copper conductor is increased, and the copper conductor is prevented from being damaged by external force. The mineral tape insulating layer 2 is formed by lapping mica tapes with the thickness of 0.14-0.17 mm.

When the fireproof insulation board works, the ceramic polyolefin insulation layer, the metal isolation layer and the mineral fireproof isolation layer are adopted as fireproof combined structures, and the fireproof performance is good. The cable can absorb a large amount of heats after the mineral fire prevention isolation layer is heated in the 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 specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as fire retardant belting, mineral fire barrier and the like are used more often 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 in a manner that is inconsistent with the spirit of the invention.

Claims (6)

1. The utility model provides a super gentle mineral insulated cable which characterized in that includes by interior fire-retardant band layer (5), mineral fire prevention isolation layer (6), the fire-retardant band layer of second (7) and the fire-retardant polyolefin sheath of halogen-free low cigarette (8) that sets gradually outside to, first fire-retardant band layer (5) inboard is equipped with the sinle silk.

2. An ultra-flexible mineral-insulated cable according to claim 1, characterized in that the core comprises a copper conductor (1) and, arranged in sequence outside the copper conductor (1), a mineral tape insulating layer (2) and a ceramicized polyolefin insulating layer (3).

3. An ultra-flexible mineral-insulated cable according to claim 1, characterized in that the number of said wire cores is 1 to 5, and mineral cords (4) are filled between the wire cores and the first flame-retardant tape layer (5).

4. An ultra-flexible mineral-insulated cable according to claim 1, characterized in that the mineral fire barrier layer (6) is made by mixing and extruding magnesium hydroxide and montmorillonite.

5. An ultra-flexible mineral-insulated cable according to claim 2, characterized in that the copper conductor (1) is formed by stranding stranded copper monofilaments having a diameter of 0.10-0.61 mm.

6. An ultra-flexible mineral insulated cable according to claim 2, characterized in that the mineral tape insulation layer (2) is wrapped by mica tape with a thickness of 0.14-0.17 mm.

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