CN219143854U

CN219143854U - Environment-friendly medium-voltage flame-retardant fire-resistant cable

Info

Publication number: CN219143854U
Application number: CN202223575452.1U
Authority: CN
Inventors: 郑焕然; 刘松东; 李云欢; 陈永杰
Original assignee: Huizhou Jinlongyu Cable Industrial Development Co ltd
Current assignee: Huizhou Jinlongyu Cable Industrial Development Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-06
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to an environment-friendly medium-voltage flame-retardant fireproof cable which comprises an insulating wire core, a wrapping high flame-retardant layer arranged on the outer side of the insulating wire core, gap filler arranged between the insulating wire core and the wrapping high flame-retardant layer, an extrusion isolation sleeve arranged on the outer surface of the wrapping high flame-retardant layer, an extrusion ceramic fireproof layer arranged on the outer surface of the extrusion isolation sleeve, a metal armor layer arranged on the outer surface of the extrusion ceramic fireproof layer, a flame-retardant outer protective layer arranged on the outer side of the metal armor layer and a fireproof assembly arranged between the metal armor layer and the flame-retardant outer protective layer; the insulating wire core includes the conductor wire core, and the outside of conductor wire core has set gradually interior shielding layer, insulating layer, outer shielding layer, buffer layer, metal shielding layer from inside to outside. The cable has strong fire resistance, can still keep power supply within a few hours of fire, is beneficial to reducing the difficulty of personnel evacuation and fire rescue, and adopts environment-friendly materials to avoid secondary injury to human bodies.

Description

Environment-friendly medium-voltage flame-retardant fire-resistant cable

Technical Field

The utility model relates to the technical field of wires and cables, in particular to an environment-friendly medium-voltage flame-retardant fire-resistant cable.

Background

The cable is a rope-like cable formed by twisting several or several groups of wires (at least two wires in each group), wherein each group of wires are mutually insulated and are often twisted around a center, the whole outer surface is covered with a high-insulation coating, and the medium-voltage power cable refers to a power cable of 35 kilovolts or less. The requirements for power supply operation in the case of fire are higher and higher, and environmental protection and safety are also very important. At present, in large and medium-sized cities, middle and high-rise buildings, offshore oil platforms, mines, metallurgy, ships, power stations, subways, tunnels and other occasions with relatively concentrated personnel and high fireproof safety conditions, the used cable insulation layers and sheath layers are mostly made of halogen-containing materials. When fire spreads, a great amount of dense smoke can be generated, and hydrogen halide gas with strong corrosiveness and secondary disasters can be generated, so that the lives of people and equipment and the environment are endangered. The medium voltage cable with waterproof termite-proof and corrosion-proof functions disclosed in CN202221880483.5 comprises a conductor core, wherein a conductor shielding layer, an insulating layer and an insulating shielding layer are sequentially coated outside the conductor core, a semiconductive water blocking tape layer, a metal shielding layer, a water blocking tape layer, a PVC sheath layer and a longitudinal wrapping PET tape layer are sequentially coated outside the insulating shielding layer, the medium voltage cable is not provided with a fire-resistant layer, and power supply cannot be guaranteed when a fire disaster occurs.

Disclosure of Invention

In order to solve the problems, the utility model provides the environment-friendly medium-voltage flame-retardant fireproof cable which has strong fire resistance, can still keep power supply within a few hours of fire, is beneficial to reducing difficulty of personnel evacuation and fire rescue, and adopts environment-friendly materials to avoid secondary injury to human bodies.

The utility model is realized by the following scheme: the environment-friendly medium-voltage flame-retardant fire-resistant cable comprises an insulating wire core, a wrapping high flame-retardant layer arranged on the outer side of the insulating wire core, gap filler arranged between the insulating wire core and the wrapping high flame-retardant layer, an extrusion isolation sleeve arranged on the outer surface of the wrapping high flame-retardant layer, an extrusion ceramic fire-resistant layer arranged on the outer surface of the extrusion isolation sleeve, a metal armor layer arranged on the outer surface of the extrusion ceramic fire-resistant layer, a flame-retardant outer protective layer arranged on the outer side of the metal armor layer, and a fire-resistant assembly arranged between the metal armor layer and the flame-retardant outer protective layer; the insulation wire core comprises a conductor wire core, and an inner shielding layer, an insulation layer, an outer shielding layer, a buffer layer and a metal shielding layer are sequentially arranged on the outer side of the conductor wire core from inside to outside. The extrusion isolating sleeve and the flame-retardant outer protective layer are made of low-smoke halogen-free materials, a large amount of dense smoke is not generated when a fire disaster occurs, hydrogen halide gas with secondary disasters and strong corrosiveness is not generated, secondary injury to a human body is avoided, and the cable has strong fire resistance, can still keep power supply within a few hours when the fire disaster occurs, and is beneficial to reducing difficulty of personnel evacuation and fire rescue.

Further, the fireproof assembly comprises a ceramic oxygen isolation layer and a high flame retardant belt layer which are sequentially arranged from inside to outside.

Further, the high flame retardant tape layer is coated on the ceramic oxygen isolation layer, and the flame retardant outer protective layer is extruded on the high flame retardant tape layer.

Furthermore, the flame-retardant outer protective layer is made of a B1-grade flame-retardant low-smoke halogen-free material.

Further, the three insulated wire cores are arranged, and the three insulated wire core stranded cables are combined into a cable core.

Further, the inner shielding layer, the insulating layer and the outer shielding layer are formed into a three-layer co-extrusion structure through one-time extrusion and cross-linking and are coated on the outer surface of the conductor wire core.

Further, the inner shielding layer, the insulating layer and the outer shielding layer are made of semi-conductive inner shielding thermoplastic materials, high-purity chemical crosslinking polyethylene insulating materials and semi-conductive outer shielding thermoplastic materials respectively.

Furthermore, the metal armor layer is a steel tape armor layer and is formed by overlapping two layers of galvanized steel tapes in a gap.

Furthermore, the gap filler is a low-smoke zero-halogen high-flame-retardance filling rope.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the flame-retardant outer protective layer is arranged to protect the cable from being burnt in a short time, the B1-level flame-retardant low-smoke halogen-free material is adopted to prepare the flame-retardant cable, so that the smoke generated by burning is extremely low, harmful gas is not generated, and secondary injury to human bodies can be avoided. The setting of clearance filler can prevent that insulating sinle silk temperature from rising and making its short circuit nature when taking place the conflagration, and wherein ceramic flame retardant coating reaches the certain temperature and can absorb heat and form ceramic shell, can effectively the isolated heat, and the metal armor of setting is further isolated heat and is isolated oxygen in order to prevent insulating sinle silk burning through crowded packet spacer sleeve. And a buffer layer is arranged between the outer shielding layer and the metal shielding layer, so that the heat conduction quantity of the metal shielding layer (copper strips or copper wires) can be effectively reduced, and the insulating wire core is further protected. The cable has strong fire resistance, can still keep power supply within a few hours of fire, is beneficial to reducing the difficulty of personnel evacuation and fire rescue, and adopts environment-friendly materials to avoid secondary injury to human bodies.

Drawings

Fig. 1 is a schematic structural view of an environment-friendly medium-voltage flame-retardant fire-resistant cable provided by the utility model.

Fig. 2 is a schematic structural diagram of an insulated wire core according to the present utility model.

The figure comprises the following components: the cable comprises an insulating cable core 10, a conductor cable core 11, an inner shielding layer 12, an insulating layer 13, an outer shielding layer 14, a buffer layer 15, a copper strip shielding layer 16, a wrapping high flame retardant layer 20, gap filler 30, an extrusion isolation sleeve 40, an extrusion ceramic fire retardant layer 50, a metal armor layer 60, a fire retardant component 70, a ceramic oxygen isolation layer 71, a high flame retardant belt layer 72 and a flame retardant outer protective layer 80.

Detailed Description

In order to facilitate an understanding of the present utility model by those skilled in the art, the present utility model will be described in further detail with reference to specific examples and drawings.

Referring to fig. 1 to 2, the environment-friendly medium voltage flame-retardant fire-resistant cable provided by the utility model comprises an insulated wire core 10, a wrapping high flame-retardant layer 20 arranged on the outer side of the insulated wire core 10, a gap filler 30 arranged between the insulated wire core 10 and the wrapping high flame-retardant layer 20, an extrusion isolation sleeve 40 arranged on the outer surface of the wrapping high flame-retardant layer 20, an extrusion ceramic fire-resistant layer 50 arranged on the outer surface of the extrusion isolation sleeve 40, a metal armor layer 60 arranged on the outer surface of the extrusion ceramic fire-resistant layer 50, and a flame-retardant outer protective layer 80 arranged on the outer side of the metal armor layer 60, wherein a fire-resistant component 70 is arranged between the metal armor layer 60 and the flame-retardant outer protective layer. When a fire disaster occurs, the environment-friendly medium-voltage flame-retardant fire-resistant cable is protected by the flame-retardant outer protective layer 80, the power supply is not affected by the burning received in a short time, after the flame-retardant outer protective layer 80 is burnt, the flame-retardant assembly 70 arranged between the metal armor layer 60 and the flame-retardant outer protective layer 80 can isolate flame and heat, and when the heat penetrates the flame-retardant assembly 70 to continue to transfer to the inside, the heat can be further isolated by the metal armor layer 60 and oxygen can be isolated by the extrusion isolation sleeve 40 so as to prevent the insulated wire core 10 from burning. The environment-friendly medium-voltage flame-retardant fireproof cable can still keep power supply within a few hours after a fire disaster occurs, and is beneficial to reducing the difficulty of personnel evacuation and fire rescue.

The insulated wire core 10 comprises a conductor wire core 11, an inner shielding layer 12, an insulating layer 13, an outer shielding layer 14, a buffer layer 15 and a metal shielding layer 16 which are coated outside the conductor wire core 11, wherein the inner shielding layer 12, the insulating layer 13, the outer shielding layer 14, the buffer layer 15 and the metal shielding layer 16 are sequentially arranged from inside to outside. The design of triple shielding can further strengthen the anti electromagnetic induction anti power cord conduction interference of cable, and insulating layer 13 that sets up is used for insulating, prevents the cable electric leakage, is equipped with buffer layer 15 between outer shielding layer 14 and the metal shielding layer 16, can effectively reduce the heat conduction volume of metal in the metal shielding layer 16, better assurance metal shielding effectively connects simultaneously, and the better protection insulation core 10 of buffer layer 15. In this embodiment, the inner shielding layer 12, the insulating layer 13 and the outer shielding layer 14 are made of a semiconductive inner shielding thermoplastic material, a high-purity chemical cross-linked polyethylene insulating material and a semiconductive outer shielding thermoplastic material, and are formed into a three-layer co-extrusion structure by one-step extrusion and cross-linking, and the three-layer co-extrusion structure sequentially and tightly covers the outer surface of the conductor core 10, so that the cable has excellent electrical performance and mechanical performance, and long-term stable operation of the cable is ensured.

In this embodiment, the metal shield 16 is made of copper tape or wire. Preferably, the metal shielding layer 16 is made of copper wire, which has better shielding efficiency than copper tape, and is beneficial to preventing failure of the metal shielding layer due to fracture and reducing the later maintenance cost.

In this embodiment, the refractory assembly 70 includes a ceramic oxygen barrier layer 71, a high flame retardant tape layer 72. The ceramic oxygen-insulating layer 71 is disposed on the outer surface of the metal armor layer 60, the high flame-retardant tape layer 72 is coated on the ceramic oxygen-insulating layer 71, and the flame-retardant outer protective layer 80 is extruded on the high flame-retardant tape layer 72. Specifically, the high flame retardant tape layer 72 adopts glass fiber as a base material, is high temperature resistant and is not combustible, so that flame can be effectively isolated, the ceramic oxygen isolation layer 71 adopts ceramic polyolefin, and the material can absorb heat and form a ceramic shell in the combustion process, so that the diffusion of combustion heat to the inside of a cable core is avoided, the possibility of burning of the cable is further reduced, and the insulating cable core is effectively protected.

In this embodiment, the flame retardant outer sheath 80 uses a good environmental protection material. The B1-level flame-retardant low-smoke halogen-free sheath material with the latest labeling requirements of the existing building department is adopted, has good heat release inhibition, does not burn dripping matters, has extremely low smoke yield in the combustion process, does not generate harmful gas, and avoids secondary injury to human bodies.

In this embodiment, three insulated wire cores 10 are provided, the three insulated wire cores 10 are used for improving the power transmission capability of the cable, and the three insulated wire cores 10 are stranded into a cable core. Namely, the cable core is externally coated with a wrapping high flame-retardant layer 20, an extrusion isolating sleeve 40, a metal armor layer 60 and a flame-retardant outer protective layer 80, and gaps between the three insulated wire cores 10 and gaps between the cable core and the wrapping high flame-retardant layer 20 are filled with gap fillers 30.

In this embodiment, the metal armor layer 60 is a steel tape armor layer, and is formed by overlapping two galvanized steel tapes in a gap, so that flame can be effectively isolated.

In this embodiment, the gap filler 30 is a low-smoke halogen-free high-flame-retardant filling rope, so that the gap filler 30 has good flame retardant property and heat insulation property, and meanwhile, the low-smoke halogen-free high-flame-retardant rope does not generate unpleasant and toxic gas when being burnt, and the smoke yield is low, thereby being beneficial to personnel escape.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is merely for convenience in describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed" and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

While the utility model has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the scope of the appended claims.

Claims

1. The environment-friendly medium-voltage flame-retardant fire-resistant cable is characterized by comprising an insulating wire core, a wrapping high flame-retardant layer arranged on the outer side of the insulating wire core, gap filler arranged between the insulating wire core and the wrapping high flame-retardant layer, an extrusion isolation sleeve arranged on the outer surface of the wrapping high flame-retardant layer, an extrusion ceramic fire-resistant layer arranged on the outer surface of the extrusion isolation sleeve, a metal armor layer arranged on the outer surface of the extrusion ceramic fire-resistant layer, a flame-retardant outer protective layer arranged on the outer side of the metal armor layer and a fire-resistant assembly arranged between the metal armor layer and the flame-retardant outer protective layer; the insulation wire core comprises a conductor wire core, and an inner shielding layer, an insulation layer, an outer shielding layer, a buffer layer and a metal shielding layer are sequentially arranged on the outer side of the conductor wire core from inside to outside.

2. The environment-friendly medium-voltage flame-retardant fire-resistant cable according to claim 1, wherein the fire-resistant component comprises a ceramic oxygen-insulating layer and a high flame-retardant belt layer which are sequentially arranged from inside to outside.

3. The environmentally friendly medium voltage flame retardant and fire resistant cable of claim 2 wherein said high flame retardant tape layer is wrapped around said ceramic oxygen barrier layer and said flame retardant outer sheath is extruded around said high flame retardant tape layer.

4. The environmentally friendly medium voltage flame retardant fire resistant cable of claim 2 wherein said flame retardant outer jacket is made of B1 grade flame retardant low smoke halogen free material.

5. The environmentally friendly medium voltage flame retardant fire resistant cable of claim 1 wherein said insulated wire core is provided with three, three said insulated wire core strands being combined into a cable core.

6. The environment-friendly type medium voltage flame-retardant fire-resistant cable according to claim 1, wherein the inner shielding layer, the insulating layer and the outer shielding layer are formed into a three-layer co-extrusion structure through one-time extrusion crosslinking and are coated on the outer surface of the conductor core.

7. The environment-friendly type medium voltage flame retardant and fire resistant cable according to claim 1, wherein the inner shielding layer, the insulating layer and the outer shielding layer are respectively made of semi-conductive inner shielding thermoplastic material, high-purity chemical cross-linked polyethylene insulating material and semi-conductive outer shielding thermoplastic material.

8. The environmentally friendly medium voltage flame retardant fire resistant cable of claim 1 wherein the metal armor layer is a steel tape armor layer formed by overlapping two galvanized steel tapes in a gap.

9. The environmentally friendly medium voltage flame retardant fire resistant cable of claim 1 wherein the gap filler is a low smoke zero halogen high flame retardant filler rope.