Ultrahigh-temperature fireproof and explosion-proof low-voltage power cable
By using a combination of alumina fiber tape and galvanized steel tape in the cable, the problem of cable combustion and explosion in high-temperature fires is solved, achieving fire and explosion protection performance at high temperatures and ensuring the continuity and safety of power transmission.
Patent Information
- Application Number
- CN202520412928.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Existing power cables are prone to combustion in high-temperature fire or explosion environments, leading to power outages and failing to effectively protect life and property safety, and they also lack explosion-proof performance.
The fire-resistant layer is formed by the combination of inner and outer alumina fiber tapes, combined with a galvanized steel tape armor layer and a non-metallic outer sheath, to form an ultra-high temperature fireproof and explosion-proof low-voltage power cable. The B2O3 glassy sealing film is generated through the reaction of the porous structure of the alumina fiber tape and the boron carbide nano-coating, achieving high temperature insulation and explosion-proof performance.
It provides thermal insulation without damage under continuous high temperatures of 1600℃~1800℃, has fireproof and explosion-proof functions, ensures that the cable does not burn in high-temperature environments, and provides strength and protection to prevent the spread of flames and explosions.
Smart Images
Figure CN223857920U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power cable technology, specifically relating to an ultra-high temperature fireproof and explosion-proof low-voltage power cable. Background Technology
[0002] As the main carrier of power transmission, power cables are subject to increasingly stringent requirements in the industry, including fire resistance and fireproofing properties. Power cables commonly use mica tape or high flame-retardant materials as the fireproof outer sheath, which has a low upper limit for fire resistance temperature (usually ≤1000℃). Although it can resist some flames, it will cause problems such as cable combustion, power outage, insulation melting, and conductor short circuits if it exceeds three minutes in high-temperature, fire, or explosion environments. This can lead to power outages or even secondary disasters, failing to adequately protect people's lives and property. At the same time, it does not have explosion-proof properties. Utility Model Content
[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide an ultra-high temperature fireproof and explosion-proof low-voltage power cable.
[0004] The technical solution adopted by this utility model is as follows: it includes a conductor, an insulating layer, a filling layer, a fire-resistant layer, an armor layer, and an outer sheath arranged sequentially from the inside to the outside;
[0005] The filling layer is a filling rope, which is uniformly filled in the gap between the insulating layer and the fire-resistant layer;
[0006] The refractory layer is formed by an inner layer of alumina fiber tape and an outer layer of alumina fiber tape. The inner layer of alumina fiber tape has inner pores, and the outer layer of alumina fiber tape has outer pores. The inner pores and the outer pores are staggered.
[0007] The armor layer is a galvanized steel strip, which is spirally wrapped around the outside of the refractory layer in a double-layer, intermittent manner.
[0008] As a preferred embodiment of this invention, the insulating layer is made of cross-linked polyethylene material.
[0009] As a preferred embodiment of this invention, the filling rope is woven from ceramicized silicone rubber strips and glass fiber rope.
[0010] As a preferred embodiment of this invention, the outer alumina fiber belt is coated with a boron carbide nano-coating on its circumferential surface.
[0011] As a preferred embodiment of this invention, the inner layer porosity has a distribution rate of 60%-70% on its end face, and the outer layer porosity has a distribution rate of 30%-40% on its end face.
[0012] As a preferred embodiment of this invention, the double-layer gap wrapping angle of the galvanized steel strip is 30°-45°.
[0013] As a preferred embodiment of this invention, the outer sheath is made of non-metallic material.
[0014] As a preferred embodiment of this invention, the conductor is composed of multi-strand stranded copper wire or aluminum alloy wire.
[0015] The beneficial effects of this utility model are as follows:
[0016] This utility model is an ultra-high temperature fireproof and explosion-proof low-voltage power cable. By setting an alumina fiber tape as a fire-resistant layer, it can meet the requirements of continuous high temperature insulation of 1600℃~1800℃ without damage. By setting a galvanized steel tape as an armor layer, the galvanized steel tape forms a mineral insulation material when wrapping the conductor, which improves the overall strength and meets the explosion-proof characteristics. By setting a non-metallic protective sheath, the cable has the functions of moisture-proof, scratch-proof and wear-resistant. Attached Figure Description
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the structure of the refractory layer of this utility model.
[0020] In the diagram: 1. Conductor; 2. Insulating layer; 3. Filling layer; 4. Fire-resistant layer; 5. Armoring layer; 6. Outer sheath; 41. Inner alumina fiber tape; 42. Outer alumina fiber tape; 411. Inner pores; 421. Outer pores; 422. Boron carbide nano-coating. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0023] The following is combined Figure 1-2 This invention describes a specific embodiment of an ultra-high temperature fireproof and explosion-proof low-voltage power cable, comprising, from the inside out, a conductor 1, an insulation layer 2, a filling layer 3, a fire-resistant layer 4, an armor layer 5, and an outer sheath 6.
[0024] The filling layer 3 is a filling rope, which is uniformly filled in the gap between the insulating layer 2 and the fire-resistant layer 4. The filling rope is a halogen-free filling rope, and its material is ceramicized silicone rubber coating and glass fiber bundles, which form a ceramic hard shell at high temperature, which can suppress the spread of flame.
[0025] The refractory layer 4 is formed by an inner layer of alumina fiber tape 41 and an outer layer of alumina fiber tape 42. The inner layer of alumina fiber tape 41 has inner layer pores 411, and the outer layer of alumina fiber tape 42 has outer layer pores 421. The inner layer pores 411 and the outer layer pores 421 are staggered. The thickness of a single layer of the inner layer of alumina fiber tape 41 and the outer layer of alumina fiber tape 42 is preferably 0.2-0.5 mm. The refractory layer 4 formed by the inner layer of alumina fiber tape 41 and the outer layer of alumina fiber tape 42 can continuously insulate heat for ≥3 hours under a flame of 1600-1800℃, while the inner layer pores 411 and the outer layer pores 421 can release internal thermal stress and prevent cracking.
[0026] The armor layer 5 is a galvanized steel strip, which is spirally wrapped around the fire-resistant layer 4 in a double-layer gap. The armor layer 5 provides compressive strength for the cable and at the same time prevents external impacts from damaging the inner fire-resistant layer 4.
[0027] Please refer to Figure 1 As shown, the insulating layer 2 is made of cross-linked polyethylene material, with a preferred thickness of 0.5-2.0 mm. During the preparation of the insulating layer 2, it undergoes electron irradiation cross-linking treatment to form a three-dimensional network structure, enabling it to withstand temperatures up to 130°C.
[0028] Please refer to Figure 1 As shown, the filling rope is woven from ceramicized silicone rubber strips and glass fiber ropes. This material forms a ceramic hard shell at high temperatures, which can suppress the spread of flames.
[0029] Please refer to Figures 1-2As shown, the outer alumina fiber tape 42 is coated with a boron carbide nano-coating 422 on its circumference. The inner pores 411 on the inner alumina fiber tape 41 are used to absorb expanding gases, achieving self-release of thermal stress. The boron carbide nano-coating 422 reacts with oxygen at temperatures above 1600℃ to generate a B2O3 glassy sealing film, filling the outer pores 421 and blocking oxidation, preventing oxygen from entering the outer alumina fiber tape 42 after the cable's outer layer burns. Alumina, as an insulating material, wraps the conductor to form mineral insulation, and, combined with the strength of the armor layer, achieves explosion-proof characteristics.
[0030] Please refer to Figure 1 As shown, the inner layer pores 411 have a distribution rate of 60%-70% on their end faces, and the outer layer pores 421 have a distribution rate of 30%-40% on their end faces.
[0031] Please refer to Figure 1 As shown, the double-layer gap wrapping angle of the galvanized steel strip is 30°-45°. The double-layer gap wrapping ensures that the different functional layers of the inner ring are wrapped and protected, while also achieving the explosion resistance of the cable.
[0032] Please refer to Figure 1 As shown, the outer sheath 6 is made of non-metallic material and has the functions of moisture-proof, scratch-proof, and wear-resistant.
[0033] Please refer to Figure 1 As shown, the conductor 1 is composed of multi-strand stranded copper wire or aluminum alloy wire. The copper wire is preferably oxygen-free copper (purity ≥99.95%), and rare earth elements can be added to the aluminum alloy to improve bending creep resistance and ensure high conductivity and flexibility.
[0034] Working principle of this utility model:
[0035] The cable structure consists of, from the inside out, conductor 1, insulation layer 2, filling layer 3, fire-resistant layer 4, armor layer 5, and outer sheath 6.
[0036] Among them, the insulating layer 2 is used to include the conductor 1 and has a certain temperature resistance rating;
[0037] The filling layer 3 is formed by ceramicized silicone rubber coating and glass fiber bundle weaving, and uniformly fills the gap between the insulation layer 2 and the fire-resistant layer 4. The filling layer 3 forms a ceramic hard shell at high temperature, which can suppress the spread of flame and improve the high temperature resistance of the cable.
[0038] The fire-resistant layer 4 is formed by an inner layer of alumina fiber tape 41 and an outer layer of alumina fiber tape 42. The inner layer of alumina fiber tape 41 and the outer layer of alumina fiber tape 42 are respectively provided with inner layer pores 411 and outer layer pores 421. The outer surface of the outer layer of alumina fiber tape 42 is formed with a boron carbide nano-coating 422. When the boron carbide nano-coating is subjected to high temperature, it reacts with oxygen to generate a B2O3 glassy sealing film, which fills the outer layer pores 421, thus isolating the fire-resistant layer from air after combustion. The inner layer pores 411 are used to absorb expanding gas to achieve self-release of thermal stress and meet the thermal expansion and contraction of the cable.
[0039] The armor layer 5 is a galvanized steel strip wrapped in a double-layered, intermittent spiral around the fire-resistant layer 4 to provide strength for the cable;
[0040] The outer sheath 6 is made of non-metallic material, which gives the cable moisture-proof, scratch-proof and wear-resistant functions.
[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.
Claims
1. An ultra-high temperature fire and explosion resistant low voltage power cable, characterized in that: The cable comprises, from inside to outside, a conductor (1), an insulation layer (2), a filling layer (3), a fire-resistant layer (4), an armored layer (5), and an outer sheath (6); The filling layer (3) is a filling rope, which is uniformly filled in the gap between the insulation layer (2) and the fire-resistant layer (4); The fire-resistant layer (4) is formed by compounding an inner layer of alumina fiber tape (41) and an outer layer of alumina fiber tape (42), the inner layer of alumina fiber tape (41) is provided with inner layer apertures (411), the outer layer of alumina fiber tape (42) is provided with outer layer apertures (421), and the inner layer apertures (411) and the outer layer apertures (421) are distributed staggeredly. The armored layer (5) is a galvanized steel belt, which is spirally wrapped outside the fire-resistant layer (4) in a double-layer gap mode.
2. An ultra-high voltage fire and explosion proof low voltage power cable according to claim 1, characterized in that: The insulation layer (2) is made of cross-linked polyethylene material.
3. The ultra-high temperature, fire and explosion resistant, low voltage power cable of claim 1, wherein: The filling rope is formed by weaving ceramicized silicone rubber strips and glass fiber ropes.
4. The ultra-high temperature, fire and explosion resistant, low voltage power cable of claim 1, wherein: The outer layer of alumina fiber tape (42) is coated with a boron carbide nano coating (422) on the peripheral surface.
5. An ultra-high voltage fire and explosion proof low voltage power cable according to claim 4, characterized in that: The distribution rate of the inner layer apertures (411) on the end surface is 60%-70%, and the distribution rate of the outer layer apertures (421) on the end surface is 30%-40%.
6. An ultra-high temperature, fire and explosion resistant, low voltage power cable according to claim 1, characterized in that: The double-layer gap mode wrapping angle of the galvanized steel belt is 30°-45°.
7. The ultra-high temperature, fire and explosion resistant, low voltage power cable of claim 1, wherein: The outer sheath (6) is made of non-metallic material.
8. An ultra-high temperature, fire and explosion resistant, low voltage power cable according to claim 1, characterized in that: The conductor (1) is composed of multiple strands of twisted copper wire or aluminum alloy wire.