CN214175751U

CN214175751U - Insulating flame-retardant fire-resistant medium-voltage cable

Info

Publication number: CN214175751U
Application number: CN202022947895.3U
Authority: CN
Inventors: 史波
Original assignee: Wuxi Shuguang Cable Co Ltd
Current assignee: Wuxi Shuguang Cable Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-09-10
Anticipated expiration: 2030-12-11

Abstract

The utility model relates to the technical field of medium voltage cables, and discloses an insulated flame-retardant fire-resistant medium voltage cable, which comprises a cable core and a conductor, wherein the outer wall of the conductor is connected with an inner shielding layer, the outer wall of the inner shielding layer is connected with an insulating layer, the outer wall of the insulating layer is connected with an outer shielding layer, the outer wall of the outer shielding layer is connected with a metal shielding layer, a filling layer is arranged outside the metal shielding layer, the filling layer is connected with an inner sheath, the outer wall of the inner sheath is connected with a mica tape wrapping layer, the outer wall of the mica tape wrapping layer is connected with a heat insulation layer, the outer wall of the heat insulation layer is connected with an oxygen insulation layer, the outer wall of the oxygen insulation layer is connected with a fireproof layer, the outer wall of the fireproof layer is connected with an outer sheath, and a plurality of connecting grooves are formed in the outer wall of the outer sheath at equal intervals around the outer wall of the outer sheath, the outer wall of the outer sheath is connected with the buffer layer, and springs are connected in the buffer layer at equal intervals around the inner part of the buffer layer. The insulating flame-retardant fire-resistant medium-voltage cable has a good flame-retardant effect and also has good extrusion resistance.

Description

Insulating flame-retardant fire-resistant medium-voltage cable

Technical Field

The utility model relates to a medium voltage cable technical field specifically is a fire-retardant fire-resistant medium voltage cable of insulating type.

Background

With the rapid economic development speed of China, the safety of medium-voltage power distribution systems in important places such as hospitals, nuclear power stations, power plants, supermarkets, super-huge high-rise buildings and the like under the fire hazard condition has higher requirements, the capacity transmission of low-voltage fire-resistant power cables cannot meet the requirements of users, and the demand of medium-voltage fire-resistant cables is more and more in recent years.

Thus current fire-retardant fire-resistant medium voltage cable of insulating type adds multilayer fire prevention, refractory material for improve refractiveness, make the cost improve, the cable can cause the friction with ground in laying process in addition, leads to the wearing and tearing of cable conductor, takes place to break easily from this protective layer, can not have certain guard action to the protective layer through reducing the collision, receives under the extruded condition at the cable, certain cushioning effect that has that can not be fine.

To this end, we have designed an insulating flame-retardant fire-resistant medium voltage cable.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a fire-retardant fire-resistant medium voltage cable of insulating type has solved thereby current fire-retardant fire-resistant medium voltage cable of insulating type adds the multilayer fire prevention in order to improve refractiveness, refractory material, make the cost improve, the cable can cause the friction with ground in laying process in addition, lead to the wearing and tearing of cable conductor, the protective layer breaks easily from this, can not have certain guard action to the protective layer through reducing the collision, receive under the extruded condition at the cable, the problem that has certain cushioning effect that can not be fine.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

an insulated flame-retardant fire-resistant medium-voltage cable comprises a cable core and a conductor, wherein the outer wall of the conductor is connected with an inner shielding layer, the outer wall of the inner shielding layer is connected with an insulating layer, the outer wall of the insulating layer is connected with an outer shielding layer, the outer wall of the outer shielding layer is connected with a metal shielding layer, a filling layer is arranged outside the metal shielding layer, the filling layer is connected with an inner sheath, the outer wall of the inner sheath is connected with a mica tape wrapping layer, the outer wall of the mica tape wrapping layer is connected with a heat insulation layer, the outer wall of the heat insulation layer is connected with an oxygen insulation layer, the outer wall of the oxygen insulation layer is connected with a fireproof layer, the outer wall of the fireproof layer is connected with an outer sheath, and a plurality of connecting grooves are equidistantly arranged on the outer wall of the outer sheath, the outer wall of the outer sheath is connected with the buffer layer, and a circle of the inside buffer layer is equidistantly connected with a spring, one end of the spring is connected with a connecting block, and the connecting block is correspondingly connected with a connecting groove.

Furthermore, the cable core is composed of a conductor, an inner shielding layer, an insulating layer, an outer shielding layer and a metal shielding layer from inside to outside in sequence.

Furthermore, the metal shielding layer is a double-layer copper strip extruded shielding layer, and the outer sheath and the inner sheath are both high-flame-retardant polyolefin mixture sheaths.

Furthermore, the filling layer is made of hemp rope braided fabric, and rubber particles are filled in the inner wall of the hemp rope braided fabric.

Further, the heat insulation layer is made of a ceramic fireproof polyolefin material, and the mica tape wrapping layer is made of a mica tape or a ceramic silica gel tape.

Furthermore, the flame retardant coating is formed by combining a first high flame retardant belt, a non-metallic sheath and a second high flame retardant belt from inside to outside in sequence.

Furthermore, the buffer layer slides in from the spread groove one end that is equipped with on the oversheath through the connecting block and overlaps on the oversheath outer wall.

The utility model has the advantages that:

1. the utility model discloses a, the insulating layer adopts the preparation of the fire-resistant polyolefin material of pottery to form, adopts the fire-resistant polyolefin insulating layer of pottery, under temperature or the flame condition more than the angle C, can generate complete ceramic form casing rapidly, has fabulous thermal-insulated effect of oxygen separation, can effectively keep apart high temperature flame and to the inside infringement of circuit, delays the decomposition of inside material, avoids the conductor to fuse in flame, guarantees the circuit in the conflagration condition.

2. The utility model discloses a, the buffer layer slides in the cover from the spread groove one end that is equipped with on the oversheath through the connecting block and establishes on the oversheath outer wall, under the effect of buffer layer, when the cable pulls in laying process and receives friction and extrusion, the spring has certain cushioning nature, protection oversheath that can be fine, increases the life of cable.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the conductor;

FIG. 3 is a schematic view of the internal structure of the refractory;

fig. 4 is an enlarged schematic view of a portion a in fig. 1.

In the figure: 1. a conductor; 2. an inner shield layer; 3. an insulating layer; 4. an outer shield layer; 5. a metal shielding layer; 6. a cable core; 7. a filling layer; 8. an inner sheath; 9. a mica tape lapping layer; 10. a thermal insulation layer; 11. an oxygen barrier layer; 12. a fire barrier layer; 13. a refractory layer; 14. a first high flame retardant tape; 15. a non-metallic sheath; 16. a second highly flame retardant tape; 17. an outer sheath; 18. connecting grooves; 19. a buffer layer; 20. a spring; 21. and (4) connecting the blocks.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to FIGS. 1-4: an insulating flame-retardant fire-resistant medium-voltage cable comprises a cable core 6 and a conductor 1, wherein the outer wall of the conductor 1 is connected with an inner shielding layer 2, the outer wall of the inner shielding layer 2 is connected with an insulating layer 3, the outer wall of the insulating layer 3 is connected with an outer shielding layer 4, the outer wall of the outer shielding layer 4 is connected with a metal shielding layer 5, a filling layer 7 is arranged outside the metal shielding layer 5, the outer part of the filling layer 7 is connected with an inner sheath 8, the outer wall of the inner sheath 8 is connected with a mica tape wrapping layer 9, the outer wall of the mica tape wrapping layer 9 is connected with a heat-insulating layer 10, the outer wall of the heat-insulating layer 10 is connected with an oxygen-insulating layer 11, the outer wall of the oxygen-insulating layer 11 is connected with a fire-resistant layer 12, the outer wall of the fire-resistant layer 12 is connected with a fire-resistant layer 13, the outer wall of the fire, and the connection block 21 is correspondingly connected with the connection groove 18.

The cable core 6 comprises conductor 1, internal shield layer 2, insulating layer 3, external shield layer 4 and metallic shield layer 5 from inside to outside in proper order, and metallic shield layer 5 is double-deck copper strips crowded package shielding layer, and oversheath 17 and inner sheath 8 are high fire-retardant polyolefin mixture sheath, protect the cable through inside and outside double-deck sheath for the cable has good flame retardant efficiency, can use under high temperature environment.

The heat insulation layer 10 is made of ceramic fire-resistant polyolefin materials, and the ceramic fire-resistant polyolefin heat insulation layer 10 can rapidly generate a complete ceramic shell at a temperature of above 650 ℃ or under a flame condition, so that the ceramic heat insulation layer has a good oxygen insulation and heat insulation effect, can effectively isolate the invasion of high-temperature flame to the inside of a circuit, delays the decomposition of internal materials, prevents a conductor from being fused in flame, and ensures that the circuit is in a fire condition.

Flame retardant coating 13 is from inside to outside in proper order by first high flame retardant belt 14, non-metallic sheath 15 and the high flame retardant belt 16 combination of second form, high flame retardant belt adopts the mode around the package, can make the compact structure of cable, make each layer zonulae occludens, stable in structure, let the diameter of cable reduce, set up non-metallic sheath layer 15 between first high flame retardant belt 14 and the high flame retardant belt 16 of second, can make the cable have mechanical properties such as excellent pliability and corrosion resistance, high flame retardant belt layer can play the buffering to non-metallic sheath layer 15.

Buffer layer 19 slides in from the connecting groove 18 one end that is equipped with on oversheath 17 through connecting block 21 and overlaps on oversheath 17 outer wall, under buffer layer 19's effect, when the cable pulls in laying process and receives friction and extrusion, spring 20 has certain cushioning nature, protection oversheath that can be fine, increases the life of cable.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides an insulating type flame retardant fire-resistant medium voltage cable, includes cable core (6) and conductor (1), its characterized in that: the outer wall of the conductor (1) is connected with an inner shielding layer (2), the outer wall of the inner shielding layer (2) is connected with an insulating layer (3), the outer wall of the insulating layer (3) is connected with an outer shielding layer (4), the outer wall of the outer shielding layer (4) is connected with a metal shielding layer (5), a filling layer (7) is arranged outside the metal shielding layer (5), the outer side of the filling layer (7) is connected with an inner sheath (8), the outer wall of the inner sheath (8) is connected with a mica tape wound on a covering (9), the mica tape is connected with a heat insulation layer (10) on the outer wall of the wound covering (9), the outer wall of the heat insulation layer (10) is connected with an oxygen insulation layer (11), the outer wall of the oxygen insulation layer (11) is connected with a fire-proof layer (12), the outer wall of the fire-proof layer (12) is connected with a fire-proof layer (13), the outer wall of the fire-proof layer (13) is connected with an outer sheath (17), and a plurality of connecting grooves (18) are equidistantly arranged around the outer wall of the outer sheath (17), the outer wall of the outer sheath (17) is connected with the buffer layer (19), springs (20) are equidistantly connected to the inner periphery of the buffer layer (19), one ends of the springs (20) are connected with the connecting blocks (21), and the connecting blocks (21) are correspondingly connected with the connecting grooves (18).

2. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the cable core (6) is composed of a conductor (1), an inner shielding layer (2), an insulating layer (3), an outer shielding layer (4) and a metal shielding layer (5) from inside to outside in sequence.

3. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the metal shielding layer (5) is a double-layer copper strip extruded shielding layer, and the outer sheath (17) and the inner sheath (8) are both high-flame-retardant polyolefin mixture sheaths.

4. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the filling layer (7) is made of hemp rope braided fabric, and rubber particles are filled in the inner wall of the hemp rope braided fabric.

5. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the heat insulation layer (10) is made of a ceramic fireproof polyolefin material, and the mica tape wrapping layer (9) is made of a mica tape or a ceramic silica gel tape.

6. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the flame retardant coating (13) is formed by combining a first high flame retardant belt (14), a non-metal sheath (15) and a second high flame retardant belt (16) from inside to outside in sequence.

7. An insulated flame-retardant fire-resistant medium voltage cable according to claim 1, characterized in that: the buffer layer (19) slides in and is sleeved on the outer wall of the outer sheath (17) from one end of a connecting groove (18) arranged on the outer sheath (17) through a connecting block (21).