CN211788311U

CN211788311U - High-fire-resistance underground cable

Info

Publication number: CN211788311U
Application number: CN202020781266.5U
Authority: CN
Inventors: 王厚山
Original assignee: Wuhan Hongze Wire And Cable Manufacturing Co ltd
Current assignee: Wuhan Hongze Wire And Cable Manufacturing Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-10-27
Anticipated expiration: 2030-05-13

Abstract

The utility model discloses a high fire resistance underground cable relates to underground cable technical field, for solving the relatively poor problem of current underground cable fire behavior. The fixed inoxidizing coating that is provided with of outer wall of polyvinyl chloride sheath, the inoxidizing coating includes that polyvinyl chloride is protruding and the polyvinyl chloride button head is suddenly stinged, the inner wall of polyvinyl chloride sheath is provided with the flame retardant coating, the inside of flame retardant coating is annular array and has seted up a plurality of thermal-insulated chambeies, one side that thermal-insulated chamber is close to the polyvinyl chloride sheath is provided with the through-hole, the inner wall of flame retardant coating is provided with the asbestos layer, the inner wall on asbestos layer is provided with fixed cover, the inside of fixed cover is annular array and has seted up a plurality of metallic conductor, metallic conductor's outside has all wrapped up the insulating layer, and the outer wall of insulating layer is tangent with metallic conductor's inner wall, be provided with hot melt between metallic conductor and the.

Description

High-fire-resistance underground cable

Technical Field

The utility model relates to an underground cable technical field specifically is a high refractiveness underground cable.

Background

Underground cable is a cable which is buried underground compared with common overhead lines, and is also called underground cable. Cables are made of one or more mutually insulated conductors surrounded by an insulating layer and a protective layer for transmitting power or information from one location to another. After entering modern society, due to the reasons of shortage of urban land, high traffic pressure, urban construction and the like, underground cable power transmission is commonly adopted in large cities. Compared with an overhead line, the cable has the advantages of small occupied area, reliable power transmission, strong anti-interference capability and the like.

However, the existing underground cable is poor in fire resistance, however, the installation environment of the underground cable is complex compared with that of an overhead line, and the cable is easily melted at high temperature when the weather is hot or a fire disaster occurs, so that danger is caused, and the existing requirement is not met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high fire resistance underground cable to solve the relatively poor problem of underground cable fire behavior who provides in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a high-fire-resistance underground cable comprises a polyvinyl chloride sheath, wherein a protective layer is fixedly arranged on the outer wall of the polyvinyl chloride sheath and comprises polyvinyl chloride protrusions and polyvinyl chloride round-head spurs, the polyvinyl chloride round-head spurs are positioned outside the polyvinyl chloride protrusions, the polyvinyl chloride protrusions are provided with a plurality of polyvinyl chloride projections which are distributed in sequence, a fire-proof layer is arranged on the inner wall of the polyvinyl chloride sheath, a plurality of heat-insulation cavities are formed in the fire-proof layer in an annular array mode, through holes are formed in one side, close to the polyvinyl chloride sheath, of each heat-insulation cavity, the number of the through holes is four, an asbestos layer is arranged on the inner wall of the fire-proof layer, a fixing sleeve is arranged on the inner wall of the asbestos layer, a plurality of metal conductors are formed in the fixing sleeve in an annular array mode, an insulating layer wraps the outer portion of each metal conductor, and, a hot-melting filling cavity is arranged between the metal conductor and the fixing sleeve, and hot-melting materials are filled in the hot-melting filling cavity.

Preferably, the fireproof layer is fixedly connected with the polyvinyl chloride sheath and the asbestos layer, the heat insulation cavity is communicated with the through hole, and one end of the through hole is attached to the polyvinyl chloride sheath.

Preferably, the asbestos layer is spirally wound outside the fixing sleeve and is fixedly connected with the fixing sleeve.

Preferably, the metal conductor is fixedly connected with the insulating layer, and the fixing sleeve is wrapped outside the insulating layer.

Preferably, the metal conductors are braided by spiral twisting, the diameter of each metal conductor is eight millimeters, and each metal conductor divides the hot-melt filling cavity into a plurality of cavities.

Preferably, the polyvinyl chloride protrusion is spirally wound outside the polyvinyl chloride sheath, and the polyvinyl chloride protrusion and the polyvinyl chloride sheath are of an integrated structure, the length of the polyvinyl chloride round-head bur is six millimeters, and the polyvinyl chloride round-head bur and the polyvinyl chloride protrusion are of an integrated structure.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a fixed flame retardant coating that is provided with of inner wall at the polyvinyl chloride sheath, the fire-proof material in the flame retardant coating is aerogel felt, and aerogel felt is with nanometer silica aerogel as main part material, through the flexible heat preservation felt that special technology formed with glass fiber cotton or the preoxidation fibrofelt complex. Its characteristics are that the thermal conductivity is low, there are certain tensile and compressive strength, belong to neotype insulation material, the fire prevention heat-proof quality is outstanding, it has seted up a plurality of thermal-insulated chambeies to be the annular array simultaneously at the inner wall of aerogel felt, thermal-insulated chamber provides certain space for the inside of aerogel felt on the one hand, avoided causing the influence to cable physique structure along with the expend with heat and contract with cold that underground temperature variation produced, on the other hand when the temperature improves, thermal-insulated chamber can carry out the separation to the temperature, the design of through-hole can accelerate thermal giving off simultaneously, thereby accelerate the decline of bulk temperature.

2. The utility model discloses an inner wall at the flame retardant coating is provided with the asbestos layer, and the asbestos is the heliciform and twines in the outside of fixed cover, and it has high fire resistance, high tensile strength and hot erosion electrical insulation nature, is important fire prevention, insulation and insulation material, and the asbestos layer is as the great improvement underground cable's of second grade flame retardant coating cooperation aerogel felt flame retardant coating fire behavior.

3. The utility model discloses an outside at the polyvinyl chloride sheath is provided with the inoxidizing coating, and the inoxidizing coating comprises the protruding and bur suddenly of polyvinyl chloride button head, and the polyvinyl chloride arch is the outside of heliciform winding and polyvinyl chloride sheath, and the bur suddenly of polyvinyl chloride button head is arranged in the bellied outside of polyvinyl chloride in proper order simultaneously, and the staff installation of being convenient for on the one hand improves frictional force, and the other party avoids the ground end biology to gnaw and stings, has improved the life of underground cable.

Drawings

FIG. 1 is a sectional view of the overall structure of the present invention;

FIG. 2 is an overall perspective view of the present invention;

fig. 3 is a partially enlarged view of the area a of the present invention.

In the figure: 1. a polyvinyl chloride sheath; 2. a fire barrier layer; 3. an asbestos layer; 4. fixing a sleeve; 5. a metal conductor; 6. an insulating layer; 7. a hot melt material; 8. a protective layer; 9. a hot melt fill cavity; 10. a polyvinyl chloride protrusion; 11. polyvinyl chloride round-head spurs; 12. a thermally insulating cavity; 13. and a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, the present invention provides an embodiment: a high fire resistance underground cable comprises a polyvinyl chloride sheath 1, a protective layer 8 is fixedly arranged on the outer wall of the polyvinyl chloride sheath 1, the protective layer 8 comprises polyvinyl chloride bulges 10 and polyvinyl chloride round-head spurs 11, the polyvinyl chloride round-head spurs 11 are positioned outside the polyvinyl chloride bulges 10, a plurality of polyvinyl chloride bulges 10 are arranged, the polyvinyl chloride bulges 10 are distributed in sequence, a fire-proof layer 2 is arranged on the inner wall of the polyvinyl chloride sheath 1, a plurality of heat-insulating cavities 12 are arranged in the fire-proof layer 2 in an annular array mode, through holes 13 are arranged on one sides, close to the polyvinyl chloride sheath 1, of the heat-insulating cavities 12, four through holes 13 are arranged, an asbestos layer 3 is arranged on the inner wall of the fire-proof layer 2, a fixing sleeve 4 is arranged on the inner wall of the asbestos layer 3, a plurality of metal conductors 5 are arranged in the annular array mode inside the fixing sleeve 4, and the outer wall of the insulating layer 6 is tangent to the inner wall of the metal conductor 5, a hot-melting filling cavity 9 is arranged between the metal conductor 5 and the fixing sleeve 4, and hot-melting materials 7 are filled in the hot-melting filling cavity 9.

Further, flame retardant coating 2 and

polyvinyl chloride sheath

1 and 3 fixed connection on asbestos layer, thermal-insulated chamber 12 is linked together with through-hole 13, and the one end of through-hole 13 is laminated with polyvinyl chloride sheath 1 mutually, thermal-insulated chamber 12 provides certain space for the inside of aerogel felt on the one hand, avoided causing the influence to cable physique structure along with the expend with heat and contract with cold that underground temperature variation produced, on the other hand when the temperature improves, thermal-insulated chamber 12 can carry out the separation to the temperature, thermal giving off can be accelerated in the design of through-hole 13 simultaneously, thereby accelerate the decline of bulk temperature.

Further, asbestos layer 3 is the heliciform winding in the outside of fixed cover 4, and asbestos layer 3 and fixed cover 4 fixed connection, asbestos layer 3 as the fire resistance that the second grade flame retardant coating cooperation aerogel felt flame retardant coating 2 is very big improvement underground cable.

Further,

metallic conductor

5 and 6 fixed connection of insulating layer, fixed cover 4 wraps up in the outside of insulating layer 6, and insulating layer 6 is PVC insulating material, has good insulating nature, and fixed cover 4 can be fixed metallic conductor 5 simultaneously.

Further, the metal conductors 5 are braided by spiral twisting, the diameter of each metal conductor 5 is eight millimeters, the metal conductors 5 divide the hot-melt filling cavity 9 into a plurality of cavities, and the hot-melt material 7 is heated, so that the hot-melt material is converted from a solid state into a liquid state and is converted into a solid state, and other internal structures can be tightly attached to form a whole.

Further, protruding 10 of polyvinyl chloride is the heliciform winding in the outside of polyvinyl chloride sheath 1, and polyvinyl chloride is protruding 10 and polyvinyl chloride sheath 1 structure as an organic whole, and the length that the bur 11 was suddenly to the polyvinyl chloride button head is six millimeters, and 11 and the protruding 10 structures as an organic whole of polyvinyl chloride button head, the staff installation of being convenient for on the one hand improves frictional force, and the other party avoids the ground floor biology to gnaw and stings, has improved underground cable's life.

The working principle is as follows: when in use, the fireproof layer 2 is fixedly arranged on the inner wall of the polyvinyl chloride sheath 1, the fireproof material in the fireproof layer 2 is aerogel felt, the aerogel felt is a flexible heat-insulating felt which is formed by compounding nano silica aerogel serving as a main body material and glass fiber cotton or preoxidized fiber felt through a special process, the flexible heat-insulating felt is characterized by low heat conduction coefficient, certain tensile strength and compressive strength, belongs to a novel heat-insulating material and has excellent fireproof and heat-insulating properties, and meanwhile, a plurality of heat-insulating cavities 12 are arranged on the inner wall of the aerogel felt in an annular array, so that on one hand, the heat-insulating cavities 12 provide certain space for the inside of the aerogel felt, the influence of expansion caused by cold and heat along with the change of underground temperature on the cable body structure is avoided, on the other hand, when the temperature is increased, the heat-insulating cavities 12 can block the temperature, and meanwhile, the heat emission can be accelerated by the design of the through, be provided with asbestos layer 3 at the inner wall of flame retardant coating 2, the asbestos is the outside of heliciform winding in fixed cover 4, it has high fire resistance, high tensile strength and hot erosion electrical insulation nature, it is important fire prevention, insulating and insulation material, asbestos layer 3 is as the second grade flame retardant coating cooperation aerogel felt flame retardant coating 2 very big improvement underground cable's fire resistance, be provided with inoxidizing coating 8 in polyvinyl chloride sheath 1's outside in addition, inoxidizing coating 8 comprises protruding 10 of polyvinyl chloride and polyvinyl chloride button head bur 11, polyvinyl chloride is protruding 10 to be the outside of heliciform winding and polyvinyl chloride sheath 1, polyvinyl chloride button head bur 11 arranges in the protruding 10 outside of polyvinyl chloride in proper order simultaneously, be convenient for the staff installation on the one hand, improve frictional force, the other party avoids the ground floor biology to gnaw and sting, underground cable's life has been improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An underground cable with high fire resistance, comprising a polyvinyl chloride sheath (1), characterized in that: the outer wall of the polyvinyl chloride sheath (1) is fixedly provided with an protective layer (8), the protective layer (8) comprises polyvinyl chloride protrusions (10) and polyvinyl chloride round-head spurs (11), the polyvinyl chloride round-head spurs (11) are located outside the polyvinyl chloride protrusions (10), the polyvinyl chloride protrusions (10) are provided with a plurality of polyvinyl chloride protrusions (10), the polyvinyl chloride protrusions (10) are distributed in sequence, the inner wall of the polyvinyl chloride sheath (1) is provided with a fireproof layer (2), the inside of the fireproof layer (2) is provided with a plurality of heat insulation cavities (12) in an annular array mode, one side, close to the polyvinyl chloride sheath (1), of each heat insulation cavity (12) is provided with through holes (13), the number of the through holes (13) is four, the inner wall of the fireproof layer (2) is provided with a asbestos layer (3), the inner wall of the asbestos layer (3) is provided with a fixing sleeve (4), the inside of the fixing sleeve (4) is provided with a plurality, insulating layer (6) have all been wrapped up to the outside of metallic conductor (5), and the outer wall of insulating layer (6) is tangent with the inner wall of metallic conductor (5), be provided with hot melt between metallic conductor (5) and fixed cover (4) and fill chamber (9), the inside packing of hot melt filling chamber (9) has hot melt material (7).

2. A highly fire-resistant underground cable according to claim 1, wherein: the fireproof layer (2) is fixedly connected with the polyvinyl chloride sheath (1) and the asbestos layer (3), the heat insulation cavity (12) is communicated with the through hole (13), and one end of the through hole (13) is attached to the polyvinyl chloride sheath (1).

3. A highly fire-resistant underground cable according to claim 1, wherein: the asbestos layer (3) is spirally wound outside the fixed sleeve (4), and the asbestos layer (3) is fixedly connected with the fixed sleeve (4).

4. A highly fire-resistant underground cable according to claim 1, wherein: the metal conductor (5) is fixedly connected with the insulating layer (6), and the fixing sleeve (4) is wrapped outside the insulating layer (6).

5. A highly fire-resistant underground cable according to claim 1, wherein: the metal conductors (5) are braided by spiral twisting, the diameter of each metal conductor (5) is eight millimeters, and the hot-melt filling cavity (9) is divided into a plurality of cavities by the metal conductors (5).

6. A highly fire-resistant underground cable according to claim 1, wherein: polyvinyl chloride is protruding (10) to be the outside of heliciform winding in polyvinyl chloride sheath (1), and polyvinyl chloride is protruding (10) and polyvinyl chloride sheath (1) structure as an organic whole, the length of polyvinyl chloride button head thorn (11) is six millimeters, and polyvinyl chloride button head thorn (11) and the protruding (10) structure as an organic whole of polyvinyl chloride.