CN218038658U

CN218038658U - Isolated flexible mineral insulated cable

Info

Publication number: CN218038658U
Application number: CN202222266983.6U
Authority: CN
Inventors: 孙玉才; 曹文栋
Original assignee: Tianjin Feiya Fengda Cable Technology Co ltd
Current assignee: Tianjin Feiya Fengda Cable Technology Co ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2022-12-13
Anticipated expiration: 2032-08-26

Abstract

The application discloses flexible mineral insulated cable of isolated form belongs to the technical field of cable, and its technical scheme main points are flexible mineral insulated cable of isolated form, including copper conductor, insulating layer and oversheath, the copper conductor is provided with a plurality ofly, the insulating layer cover is established outside the copper conductor, the oversheath cover is established outside the insulating layer, the copper conductor cover be equipped with the internal shield layer that the copper conductor is connected, the insulating layer overcoat is equipped with the insulating layer, the insulating layer with it has the oxygen material to separate to fill between the insulating layer, the insulating layer with be provided with fire-retardant layer between the oversheath, fire-retardant layer's outer wall with the inner wall butt of oversheath reaches the reduction because the not good effect that causes the condition of cable short circuit of flame retardant efficiency.

Description

Isolated flexible mineral insulated cable

Technical Field

The application relates to the technical field of cables, in particular to an isolated flexible mineral insulated cable.

Background

At present, cables are power or signal transmission consisting of several or several groups of wires. The mineral insulated cable is one cable with copper wire core covered with copper sheath and magnesia powder as inorganic insulating material to isolate conductor from sheath.

In the related art, the existing cable includes a copper wire, an insulating layer, and an outer sheath, wherein the insulating layer is sleeved on the copper wire, the insulating layer is fixedly connected with the copper wire, the outer sheath is sleeved on the insulating layer, and the outer sheath is fixedly connected with the insulating layer.

In view of the above related technologies, the inventor considers that the flame retardant effect of the existing cable is not good, and when a fire source exists outside, the outer sheath will burn, which easily causes a short circuit of the cable, thereby affecting the normal use of the cable.

SUMMERY OF THE UTILITY MODEL

In order to reduce because the not good condition that causes the cable short circuit of flame retardant efficiency, the utility model provides a flexible mineral insulated cable of isolated form.

The utility model provides a pair of flexible mineral insulated cable of isolated form adopts following technical scheme:

the utility model provides a flexible mineral insulated cable of isolated form, includes copper conductor, insulating layer and oversheath, the copper conductor is provided with a plurality ofly, the insulating layer cover is established outside the copper conductor, the oversheath cover is established outside the insulating layer, the copper conductor cover be equipped with the internal shield layer that the copper conductor is connected, the insulating layer overcoat is equipped with the insulating layer, the insulating layer with it has the oxygen material that separates to fill between the insulating layer, the insulating layer with be provided with fire-retardant layer between the oversheath, the outer wall on fire-retardant layer with the inner wall butt of oversheath.

By adopting the technical scheme, the inner shielding layer reduces the influence of the increase of the surface electric field intensity caused by the unsmooth surface of the copper conductor, and the inner shielding layer enables the copper conductor to be in good contact with the outer side; the insulating layer enables the cable and the surrounding environment or the adjacent cable to be mutually insulated, so that the situation of relative ground or interphase breakdown short circuit is reduced when power is transmitted; when the outer part of the cable is burnt, the heat insulation layer prevents heat from being transmitted to the inner part, prevents the inner cable from being damaged, and reduces the condition of short circuit of the cable caused by poor flame retardant effect; the flame retardant layer can bear higher temperature, avoid the burning of outside cable, further reduce because the not good condition that causes the cable short circuit of flame retardant efficiency.

Preferably, a fire-resistant layer connected with the inner shielding layer is arranged between the inner shielding layer and the insulating layer.

By adopting the technical scheme, when a fire disaster happens, the fire-resistant layer can keep the power supply of the cable for a certain time, and valuable time for rescuing is provided for workers.

Preferably, a fire insulation layer connected with the insulation layer is arranged between the insulation layer and the heat insulation layer.

Through adopting above-mentioned technical scheme, when the outside burning of cable, separate the fire bed and can further prevent the cable burning, and do not influence the use of cable, reduce because the not good condition that causes the cable short circuit of flame retardant efficiency.

Preferably, a fixing frame connected with the flame-retardant layer is arranged between the heat-insulating layer and the flame-retardant layer.

Through adopting above-mentioned technical scheme, the mount has the supporting role to the cable, increases the life of cable.

Preferably, the fixing frame is composed of a plurality of fixing strips made of flexible materials.

Through adopting above-mentioned technical scheme, the fixed strip prevents that fire-retardant layer fracture when the cable is bent, when the conflagration breaing out, reduces because the not good condition that causes the cable short circuit of flame retardant efficiency.

Preferably, the fixing strips are in a cross-shaped regular array.

Through adopting above-mentioned technical scheme, the fixed strip can make the cable have better crooked effect when the cable is crooked.

Preferably, a waterproof layer abutted against the heat insulation layer is arranged between the heat insulation layer and the fixing frame.

Through adopting above-mentioned technical scheme, the waterproof layer prevents to have the rainwater or have moisture to cause the cable short circuit, increases the life of cable.

To sum up, the utility model discloses following beneficial effect has:

1. the flame retardant layer, the insulating layer, the fire insulation layer, the heat insulation layer and the heat insulation material can not influence the use of an internal circuit when electric combustion is carried out, and the condition of short circuit of a cable caused by poor flame retardant effect is reduced;

2. when the fire-retardant layer prevents that external burning of a fire source from, prevent that the cable from damaging, reduce because the not good condition that causes the cable short circuit of flame retardant efficiency.

Drawings

Fig. 1 is a schematic overall structure diagram of an isolated flexible mineral insulated cable.

Fig. 2 is a cross-sectional view of an isolated flexible mineral insulated cable.

Description of reference numerals:

1. a copper wire; 2. an inner shield layer; 3. a refractory layer; 4. an insulating layer; 5. a fire barrier layer; 6. a thermal insulation layer; 61. an oxygen barrier material; 7. a waterproof layer; 8. a fixed mount; 81. a fixing strip; 9. a flame retardant layer; 10. an outer sheath.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a flexible mineral insulated cable of isolated form, refers to fig. 1, including copper conductor 1, the outside of copper conductor 1 has set gradually internal shield layer 2, flame retardant coating 3, insulating layer 4, separates flame retardant coating 5, insulating layer 6, waterproof layer 7, fire-retardant layer 9, oversheath 10 for reduce because the condition of the cable short circuit that results in of flame retardant efficiency is not good, it has oxygen material 61 to separate to fill between flame retardant coating 5 and the insulating layer 6.

Referring to fig. 2, the cross section of copper conductor 1 is regular hexagon, copper conductor 1 is provided with a plurality of, a plurality of copper conductors 1 and internal shield layer 2 fixed connection, the outer wall and the flame retardant coating 3 butt of internal shield layer 2, flame retardant coating 3 adopts ceramic silicon rubber mica tape, the outer wall of flame retardant coating 3 and the inner wall butt of insulating layer 4, insulating layer 4 can be made by phlogopite mineral substance or ceramic fire-resistant silicon rubber etc., the inner wall of insulating layer 4 and the outer wall butt of fire barrier layer 5, fire barrier layer 5 adopts seamless fire insulation aluminium sheath, copper conductor 1, internal shield layer 2, flame retardant coating 3, insulating layer 4, fire barrier layer 5 forms an insulated wire.

The inner shielding layer 2 reduces the influence of the increase of the surface electric field intensity caused by the unsmooth surface of the copper conductor 1, and the inner shielding layer 2 enables the fire-resistant layer 3 to be in good contact with the copper conductor 1. When the outside of cable burns, fire barrier 5 can further prevent that inside cable from burning, and does not influence the use of inside cable, and flame retardant coating 3 can keep the power supply of cable for a certain time, provides the valuable time of staff's rescue. The insulating layer 4 insulates the cable from the surrounding environment or from adjacent cables, ensuring that no phase-to-ground or phase-to-phase flashover short circuits occur during the transmission of electrical energy.

Referring to fig. 2, the heat insulating layer 6 is wrapped with a plurality of wires, the heat insulating layer 6 can be made of aluminum foil heat insulating cotton, etc., an oxygen insulating material 61 is filled between the heat insulating layer 6 and the fire insulating layer 5, and the oxygen insulating material 61 can be made of magnesium hydroxide, aluminum hydroxide, etc.

When the cable is burnt outside, the heat insulation layer 6 prevents heat from being transmitted to the inside of the cable, and prevents the inside of the cable from being damaged. The oxygen insulation material 61 has fire resistance and is expanded by heating, and a multi-gap high-foaming thermal resistance material is generated when meeting fire, so that the cable can play a good role in flame retardance and fire prevention, and the integrity of the circuit is effectively ensured.

Referring to fig. 1, the outer wall of insulating layer 6 and the inner wall butt of waterproof layer 7, be provided with mount 8 between waterproof layer 7 and the fire-retardant layer 9, mount 8 comprises a plurality of fixed strips 81, fixed strip 81 and fire-retardant layer 9 fixed connection, a plurality of fixed strips 81 are crossing regular array, fixed strip 81 is made by flexible material, fixed strip 81 can adopt iron wire or steel wire etc, fire-retardant layer 9 can adopt materials such as steamed low smoke polyolefin, fire-retardant layer 9's outer wall and oversheath 10 inner wall butt, oversheath 10 can be made by polyethylene.

The waterproof layer 7 prevents rainwater or moisture from causing short circuit of the cable, and the service life of the cable is prolonged. When a fire disaster happens, the flame-retardant layer 9 can bear higher temperature, harmful substances and toxic gas cannot be generated in a high-temperature environment, the generated smoke concentration is extremely low, the fire disaster is prevented from spreading rapidly, and the situation of cable short circuit caused by poor flame-retardant effect is reduced. The fixing strip 81 prevents the flame-retardant layer 9 from being broken when the cable is bent. The outer jacket 10 has excellent environmental stress crack resistance.

The application principle of use is as follows: when the outside of the cable is burnt, the fire-resistant layer 3 can keep the power supply of the cable for a certain time, and provides the time for rush repair for workers, and the fire-insulating layer 5 prevents the use of other cables from being influenced when the cable is burnt; the oxygen insulation material 61 has fire resistance and is expanded when heated, and generates a multi-gap high-foaming thermal resistance material when meeting fire, so that the oxygen insulation material can play a good role in flame retardance and fire prevention in the cable; the flame-retardant layer 9 reduces the short circuit of the cable caused by poor flame-retardant effect.

The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a flexible mineral insulated cable of isolated form, includes copper conductor (1), insulating layer (4) and oversheath (10), copper conductor (1) is provided with a plurality ofly, insulating layer (4) cover is established outside copper conductor (1), oversheath (10) cover is established outside insulating layer (4), its characterized in that: the insulating layer (4) is sleeved with a heat insulating layer (6), an oxygen isolating material (61) is filled between the heat insulating layer (6) and the insulating layer (4), a flame-retardant layer (9) is arranged between the heat insulating layer (6) and the outer sheath (10), and the outer wall of the flame-retardant layer (9) is abutted to the inner wall of the outer sheath (10).

2. An isolated flexible mineral insulated cable according to claim 1, characterized in that: and a fire-resistant layer (3) connected with the inner shielding layer (2) is arranged between the inner shielding layer (2) and the insulating layer (4).

3. An isolated flexible mineral insulated cable according to claim 1, characterized in that: and a fire insulation layer (5) connected with the insulation layer (4) is arranged between the insulation layer (4) and the heat insulation layer (6).

4. An isolated flexible mineral insulated cable according to claim 1, characterized in that: a fixing frame (8) connected with the flame-retardant layer (9) is arranged between the heat-insulating layer (6) and the flame-retardant layer (9).

5. An isolated flexible mineral insulated cable according to claim 4, wherein: the fixing frame (8) is composed of a plurality of fixing strips (81) made of flexible materials.

6. An isolated flexible mineral insulated cable according to claim 5, characterized in that: the fixing strips (81) are in a cross-shaped regular array.

7. An isolated flexible mineral insulated cable according to claim 5, characterized in that: a waterproof layer (7) which is abutted against the heat insulation layer (6) is arranged between the heat insulation layer (6) and the fixing frame (8).