CN217690590U - Flame-retardant overhead insulated cable - Google Patents

Abstract

The patent of the utility model mainly relates to the power cable field specifically discloses a fire-retardant aerial insulated cable, including leading the core, lead the crowded package in the core outside and have the insulating layer, the insulating layer surface evenly is provided with a plurality of integrated into one piece's lug, fire-retardant inner surface be provided with can with a plurality of concave parts of lug gomphosis, fire-retardant layer pass through lug and concave part gomphosis one by one and the nestification is in the insulating layer outside, the two can not relative rotation slip. Compared with the prior art, this patent mainly sets up the connected mode on insulating layer and fire-retardant layer into nested connection, though the two in close contact with, but not fixed connection, when fire-retardant overhead insulated cable receives external shock, the insulating layer all produces certain deformation with fire-retardant layer, because of the two junction is separable, certain deformation space is provided, eliminate the inside partial stress of material, prevent the two because of tearing fast fracture each other, the easy cracked technical problem of functional layer that has solved current power cable existence, thereby cause the conflagration by fracture department when preventing the cable fault.

Description

Flame-retardant overhead insulated cable

Technical Field

The utility model relates to a power cable field especially relates to a fire-retardant aerial insulated cable.

Background

The overhead insulated cable is an overhead conductor provided with an insulating layer, a flame-retardant layer and a protective sheath, is a special cable manufactured by adopting a production process similar to a crosslinked cable, and is a novel power transmission device. Modern economy develops at a high speed, and areas gradually have the requirement of high-voltage long-distance power transmission, however, in the case of vast members in China, electric energy must face different regional environments in the transmission process, and the overhead insulated cable plays a role as a central nerve and an electric energy resource determiner in the power transmission work and plays a considerable role. However, as the national power transmission system approaches to the direction of the overhead insulated cable, a plurality of power transmission line projects of the national power grid overhead insulated cable start working at the same time or work in sequence in two years. The overhead insulation is used in large scale in China, and in the face of the environment with dry weather, high temperature and severe meteorological conditions in power transmission line engineering, especially when overhead lines pass through forest, grassland and resident concentrated areas, conventional overhead insulated cables are easy to ignite surrounding combustible substances due to poor flame retardance and generate heat, faults and the like in the operation process, so that fire disasters occur, natural resources and property loss of people in China are caused, and even life safety of people is harmed. Therefore, more and more users are urgently demanding for cables having good flame retardant properties to improve the safety reliability of power systems.

The Chinese utility model 'a high flame-retardant and good-insulation electric wire and cable' (patent number ZL202022754316.3, published time 2021, 6 months and 15 days) describes the following structure: "the utility model discloses a high fire-retardant effectual electric wire and cable of insulation, including leading the core, the outside of leading the core is equipped with the insulating layer, the outside of insulating layer is equipped with fire-retardant layer, the insulating layer is formed by chlorosulfonated polyethylene layer, insulating glue film and insulating paint layer combination, chlorosulfonated polyethylene layer is located the inboard of insulating glue film, insulating glue film is located the inboard of insulating paint layer; the inner side of the flame-retardant layer is fixedly connected with the insulating layer through an adhesive. "

Among the above-mentioned technical scheme, because the cable has set up insulating layer and fire-retardant layer, fine solution cable insulation, fire-retardant problem, however, this kind of wire and cable is in the adverse circumstances that faces strong wind or meets violent striking, because of each functional layer tightly coats and bonds each other, do not have the space of relative activity each other, easily reach the yield limit fast, produce permanent deformation, final fracture, the department of fracture contacts inflammable matter and can initiate the conflagration equally, this structure has the defect, overall structure intensity is not high, can not be suitable for some extreme environment.

Disclosure of Invention

The utility model provides a fire-retardant aerial insulated cable, the easy cracked technical problem of functional layer that mainly used solved prior art existence.

The utility model provides a fire-retardant aerial insulated cable, includes leads the core, leads the core outside crowded package and has had the insulating layer, and insulating layer surface circumference evenly is equipped with a plurality of lugs, single lug perpendicular to insulating layer lateral wall, fire-retardant layer inner surface be provided with can with a plurality of recesses of lug gomphosis one by one, fire-retardant layer passes through lug and recess gomphosis and nestification in the insulating layer outside, and the two can not relative rotation slip.

The utility model discloses a theory of operation and beneficial effect:

present wire and cable has insulating layer and fire-retardant layer, the insulating layer is as an organic whole with fire-retardant layer fixed connection, compare prior art, fire-retardant overhead insulated cable set up the connected mode of insulating layer and fire-retardant layer into nested connection, although the two in close contact with, but not fixed connection, when fire-retardant overhead insulated cable received strong wind or external force striking, the yield phenomenon all takes place for insulating layer and fire-retardant layer, produce certain deformation, separable because of the two junction, certain deformation space is provided, eliminate material internal part stress, the time that insulating layer and fire-retardant layer reachd the yield limit has been prolonged, prevent the two because of tearing each other and quick fracture, thereby ignite cable itself and surrounding inflammables by the fracture when preventing lead core heating or trouble, cause the conflagration.

Preferably, the convex block is a triangular convex block, the concave part is a triangular concave part embedded with the triangular convex block, and the triangular convex block and the triangular concave part are embedded to rotate and limit the insulating layer and the flame-retardant layer, so that the cable body structure is more stable, and the insulating layer and the flame-retardant layer are prevented from being worn due to mutual sliding friction.

Preferably, the lug is a table-shaped lug, the concave part is a table-shaped concave part meshed with the table-shaped lug, the table-shaped lug and the table-shaped concave part are meshed to rotate and limit the insulating layer and the flame-retardant layer, so that the cable body structure is more stable, the insulating layer and the flame-retardant layer are prevented from being worn due to mutual sliding friction, meanwhile, the top end of the table-shaped lug is not easy to break, the strength is higher, and when external force acts on the cable body, the meshing of the table-shaped lug and the table-shaped concave part can increase the stability of the insulating layer and the flame-retardant layer.

Preferably, fire-retardant overhead insulated cable still includes the armor, and the armor cover is established in the fire-retardant layer outside, through adhesive and fire-retardant layer fixed connection, because the armor intensity is high, the wearability is good, chemical property is stable, can increase the mechanical strength of cable, improves anti-corrosion ability.

Preferably, there are 3, 6, 8 or 10 of said bumps.

Preferably, the insulating layer is made of silane crosslinked ethylene propylene rubber, crosslinked polyethylene, a flame-retardant viscose fiber layer or polytetrafluoroethylene material.

Preferably, the flame-retardant layer is made of flame-retardant cross-linked polyethylene, high-flame-retardant polyvinyl chloride, polyvinylidene fluoride, chlorosulfonated polyethylene layer or perfluoroethylene propylene copolymer.

Preferably, the armor is comprised of aluminum or aluminum alloy tape.

Drawings

Fig. 1 is a perspective view of a flame-retardant overhead insulated cable according to embodiment 1 of the present invention;

fig. 2 is a cross-sectional view of a flame-retardant overhead insulated cable according to embodiment 1 of the present invention;

fig. 3 is a cross-sectional view of the flame-retardant overhead insulated cable according to embodiment 2 of the present invention.

The components in the figure are: the core comprises a guide core 1, an insulating layer 2, a triangular bump 21, a mesa-shaped bump 211, a flame-retardant layer 3, a triangular concave part 31, a mesa-shaped concave part 311 and an armor layer 4.

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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

as shown in fig. 1 and 2: the guide core 1 is formed by drawing a phi 9mm diameter aluminum rod into monofilaments required by a corresponding structure through a wire drawing process, twisting a plurality of monofilaments according to required sectional areas and compacting and molding the monofilaments through a compacting die. The outer surface of the guide core 1 is extruded with an insulating layer 2, 6 triangular lugs 21 which are integrally formed are uniformly arranged on the outer surface of the insulating layer 2 in the circumferential direction, and the single lug 21 is vertical to the side wall of the insulating layer 2; the inner surface of the flame-retardant layer 3 is provided with a plurality of triangular recesses 31 which can be embedded with the triangular lugs 21 one by one, the flame-retardant layer 3 is embedded outside the insulating layer 2 through the embedding of the triangular lugs 21 and the triangular recesses 31, and the triangular lugs 21 and the triangular recesses 31 can not relatively rotate and slide, so that the structure of the cable body is more stable, and the abrasion of a contact surface can be prevented from being accelerated due to the relative sliding of the insulating layer 2 and the flame-retardant layer 3; the flame-retardant overhead insulated cable further comprises an armor layer 4, the armor layer 4 is sleeved on the outer side of the flame-retardant layer 3 and is fixedly connected with the flame-retardant layer 3 through an adhesive, and the armor layer is high in strength, good in wear resistance and stable in chemical property, so that the mechanical strength of the cable can be increased, and the anti-corrosion capability is improved.

Specifically, the insulating layer 2 is made of silane crosslinked ethylene propylene rubber.

Specifically, the flame-retardant layer 3 is made of flame-retardant cross-linked polyethylene, and the flame-retardant cross-linked polyethylene needs to be subjected to cooking treatment to change the molecular structure, so that the insulating property is more excellent.

Specifically, the armor 4 is made of an aluminum tape or an aluminum alloy tape.

Therefore, the insulating layer 2 and the flame-retardant layer 3 are important functional layers of the flame-retardant overhead insulated cable, when the flame-retardant overhead insulated cable is in strong wind weather or is violently impacted by external force, the insulating layer 2 and the flame-retardant layer 3 both generate a yield phenomenon and generate certain deformation, and the insulating layer 2 and the flame-retardant layer 3 are nested together through the embedding of the triangular convex blocks 21 and the triangular concave parts 31 instead of being fixedly connected together, so that a certain deformation space is provided, partial stress in the insulating layer 2 and the flame-retardant layer 3 is eliminated, the time that the insulating layer 2 and the flame-retardant layer 3 reach the yield limit is prolonged, the insulating layer 2 and the flame-retardant layer 3 are prevented from being rapidly broken due to mutual tearing, and the cable and surrounding inflammable matters are prevented from being ignited by the broken parts when the guide core 1 generates heat or breaks down, and a fire is caused.

Example 2:

as shown in fig. 3, different from embodiment 1, the protrusion is a mesa protrusion 211, the recess is a mesa recess 311 engaged with the mesa protrusion 211, the mesa protrusion 211 and the mesa recess 311 are engaged to limit the rotation of the insulating layer 2 and the flame retardant layer 3, so as to prevent the insulating layer 2 and the flame retardant layer 3 from being worn due to mutual sliding friction, and meanwhile, the top end of the mesa protrusion 211 is not easily broken, so that the strength is higher, and when an external force acts on the cable itself, the engagement of the mesa protrusion 211 and the mesa recess 311 can increase the stability of the insulating layer 2 and the flame retardant layer 3.

The flame-retardant overhead insulated cable also comprises a conductor water-blocking layer, a conductor shielding layer, an insulating shielding layer, a split-phase metal shielding layer, a cable core water-blocking layer, a package metal shielding layer, a waterproof isolation layer and an anticorrosive layer.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be pointed out that, for the person skilled in the art, without departing from the structure of the invention, several variants and modifications can be made, which should also be regarded as the scope of protection of the invention, which will not affect the effectiveness of the implementation of the invention and the utility of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (8)

1. The utility model provides a fire-retardant aerial insulated cable, includes by interior and is equipped with in proper order outward and leads core, insulating layer and fire-retardant layer, its characterized in that: the periphery of the outer surface of the insulating layer is uniformly provided with a plurality of convex blocks, a single convex block is vertical to the side wall of the insulating layer, the inner surface of the flame-retardant layer is provided with a plurality of concave parts which can be embedded with the convex blocks one by one, and the flame-retardant layer is embedded on the outer surface of the insulating layer through the embedding of the convex blocks and the concave parts.

2. The flame retardant overhead insulated cable of claim 1, wherein: the convex block is a triangular convex block, and the concave part is a triangular concave part embedded with the triangular convex block.

3. The flame retardant overhead insulated cable of claim 1, wherein: the convex block is a table-shaped convex block, and the concave part is a table-shaped concave part meshed with the table-shaped convex block.

4. The flame retardant overhead insulated cable of claim 2 or 3, wherein: the flame-retardant cable is characterized by further comprising an armor layer, wherein the armor layer is sleeved outside the flame-retardant layer and is fixedly connected with the flame-retardant layer through an adhesive.

5. The flame retardant overhead insulated cable of claim 4, wherein: the number of the bumps is 3-10.

6. The flame retardant overhead insulated cable of claim 5, wherein: the insulating layer is composed of silane crosslinked ethylene propylene rubber, crosslinked polyethylene, a flame-retardant viscose fiber layer or polytetrafluoroethylene materials.

7. The flame retardant overhead insulated cable of claim 6, wherein: the flame-retardant layer is composed of flame-retardant cross-linked polyethylene, high-flame-retardant polyvinyl chloride, polyvinylidene fluoride, chlorosulfonated polyethylene layer or perfluoroethylene propylene copolymer.

8. The flame retardant overhead insulated cable of claim 7, wherein: the armor layer is composed of aluminum strips or aluminum alloy strips.

Images