Cable
By adopting a double-layer protective structure and a fire-resistant filling unit in the cable, the problem of poor flame retardancy and fire resistance of existing cables in case of fire is solved, and higher flame retardancy, fire resistance and safety are achieved.
Patent Information
- Application Number
- CN202323561381.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-12-26
AI Technical Summary
Existing cables are flame retardant and have poor fire resistance during fire, and cannot be continuously powered on, which affects the evacuation and fire extinguishing of people, and releases toxic gases and smoke during combustion.
A cable is designed with a double -layer protective structure. The internal care layer is a refractory layer. Installation layers to enhance flame retardant, fire resistance and mechanical properties.
It can effectively prevent the combustion agent from entering the cable core during the fire. The flame retardant and refractory resistance effect is significant. It extends the operation time of the cable, improves safety, and is environmentally friendly. It does not produce toxic gases and a large amount of smoke.
Smart Images
Figure CN222394608U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power cables, in particular to a cable. Background Art
[0002] Cables are used to transmit power, transmit signals, or convert electromagnetic energy. With the development of the communications industry, people's demand for cables is also increasing.
[0003] Most existing cables use a fire-resistant sheath layer plus a flame-retardant outer sheath structure, which has a low fire-resistant temperature and a short fire-resistant time. When a fire occurs, it is impossible to continue to power on, and it is impossible to effectively buy time for people to evacuate and extinguish the fire. In addition, a large amount of toxic gas and smoke will be released during combustion, which is not conducive to the evacuation of people and affects people's safety. Utility Model Content
[0004] The utility model provides a cable, which is used to solve the problems of poor flame retardancy and fire resistance of the cable in the prior art and low safety in case of fire.
[0005] The utility model provides a cable, comprising: a plurality of cable cores, a fire-resistant filling unit, an inner sheath, a metal armor layer and an outer sheath, wherein the plurality of cable cores are arranged inside the inner sheath, the fire-resistant filling unit is filled between two adjacent cable cores and between the cable core and the inner sheath; the metal armor layer is arranged between the inner sheath and the outer sheath; wherein the inner sheath comprises a fire-resistant layer, and the outer sheath comprises a member made of a low-smoke, highly flame-retardant, halogen-free polyolefin material.
[0006] According to a cable provided by the utility model, the cable core includes a copper conductor, a first shielding layer, an insulating layer, a second shielding layer and a metal shielding layer arranged in sequence from the inside to the outside, wherein the first shielding layer includes a semi-conductive conductor shielding layer, the second shielding layer includes a semi-conductive insulating shielding layer, and the insulating layer includes a cross-linked polyolefin insulating layer.
[0007] According to a cable provided by the utility model, the cable further comprises a waterproof layer, and the waterproof layer is arranged between the fire-resistant filling unit and the inner protective layer.
[0008] According to a cable provided by the utility model, the cable further includes a first wrapping tape, wherein the first wrapping tape is located between the waterproof layer and the fire-resistant filling unit and is wound around the outer wall surface of the fire-resistant filling unit.
[0009] According to a cable provided by the utility model, the cable further comprises a second wrapping tape, and the second wrapping tape is wound around the outer wall surface of the inner sheath.
[0010] According to a cable provided by the utility model, the cable further comprises a third wrapping tape, and the third wrapping tape is wound around the outer wall surface of the metal armor layer.
[0011] According to a cable provided by the utility model, the first wrapping tape, the second wrapping tape and the third wrapping tape are all fire-resistant wrapping tapes.
[0012] According to a cable provided by the utility model, the waterproof layer comprises an aluminum-plastic composite waterproof layer; the metal armor layer comprises a galvanized steel armor layer.
[0013] According to a cable provided by the utility model, the fire-resistant layer comprises a ceramic fire-resistant layer, and the ceramic fire-resistant layer comprises a ceramicized polyolefin member and a ceramicized fire-resistant silicone rubber.
[0014] According to a cable provided by the utility model, the fire-resistant filling unit includes glass fiber rope and / or ceramic filling rope.
[0015] The cable provided by the utility model realizes double-layer protection by sequentially arranging inner and outer sheaths on the outside of multiple cable cores, wherein the inner sheath is a fire-resistant layer and the outer sheath is made of a low-smoke, highly flame-retardant, halogen-free polyolefin material. In the event of a fire, the combustion-supporting agent can be effectively prevented from entering the cable core, and the flame-retardant and fire-resistant effects are good; by arranging a fire-resistant filling unit between the cable cores, not only the roundness of the cable can be ensured, but also the flame can be blocked to avoid damaging the internal cable core; by arranging a metal armor layer between the inner sheath and the outer sheath, the mechanical properties of the cable are improved and the cable core is protected. The cable has good flame-retardant and fire-resistant properties, can operate normally in the event of a fire, and prolongs the cable operation time. It is highly safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a cross-sectional schematic diagram of the cable provided by the utility model;
[0018] Figure 2 It is a cross-sectional schematic diagram of the cable core provided by the utility model;
[0019] Reference numerals:
[0020] 1. Cable core; 11. Copper conductor; 12. First shielding layer; 13. Insulation layer; 14. Second shielding layer; 15. Metal shielding layer; 2. Refractory filling unit; 3. First wrapping tape; 4. Waterproof layer; 5. Inner sheath; 6. Second wrapping tape; 7. Metal armor layer; 8. Third wrapping tape; 9. Outer sheath. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.
[0027] Most of the existing medium-voltage fire-resistant power cables are fire-resistant sheath layers plus flame-retardant outer sheath structures, with poor fire resistance, low fire resistance temperature (750°C), short fire resistance time (90 minutes), and cannot be continuously powered under high external temperature conditions. This poses a hidden danger to people's lives and property safety in the event of a fire. Based on this, the utility model provides a cable to improve its fire resistance and flame retardant properties.
[0028] Combine the following Figure 1 to Figure 2 The utility model describes a cable.
[0029] The utility model provides a cable, comprising a plurality of cable cores 1, a fire-resistant filling unit 2, an inner sheath 5, a metal armor layer 7 and an outer sheath 9, wherein the plurality of cable cores 1 are arranged inside the inner sheath 5, the fire-resistant filling unit 2 is filled between two adjacent cable cores 1 and between the cable core 1 and the inner sheath 5; the metal armor layer 7 is arranged between the inner sheath 5 and the outer sheath 9; wherein the inner sheath 5 comprises a fire-resistant layer, and the outer sheath 9 comprises a member made of a low-smoke, highly flame-retardant, halogen-free polyolefin material.
[0030] The outer protective layer 9 in the utility model is made of low-smoke, highly flame-retardant, halogen-free polyolefin material, which has good flame retardant effect and greatly reduces the heat release, flame spread, smoke density and other indicators during combustion. It is environmentally friendly and protects the internal structure from damage in the event of a fire.
[0031] refer to Figure 1There are three cable cores 1 in the utility model, and the three cable cores 1 are all arranged in the inner sheath 5. The inner sheath 5 is a fire-resistant layer, which plays a fire-resistant role and protects the internal cable core 1; further, a fire-resistant filling unit 2 is filled between two adjacent cable cores 1, and a fire-resistant filling unit 2 is also provided between the cable core 1 and the inner sheath 5 to ensure the roundness of the cable and to block the flame in case of fire to avoid damage to the internal cable core 1.
[0032] The utility model further provides a metal armor layer 7 between the outer protective layer 9 and the inner protective layer 5. The metal armor layer 7 plays a role of resisting tension and compression, protecting the internal structure of the cable core 1 and preventing the cable core 1 from being damaged under the action of external forces.
[0033] The cable provided by the utility model sequentially arranges inner sheath 5 and outer sheath 9 outside of multiple cable cores 1, wherein the inner sheath 5 is a fire-resistant layer, and the outer sheath 9 is made of low-smoke, highly flame-retardant, halogen-free polyolefin material, to achieve double-layer protection, which can effectively prevent the combustion-supporting agent from entering the cable core 1 in case of fire, and has good flame retardant and fire-resistant effects; by arranging a fire-resistant filling unit 2 between the cable cores 1 and 1, not only the roundness of the cable can be ensured, but also the flame can be blocked to avoid damaging the internal cable core 1; by arranging a metal armor layer 7 between the inner sheath 5 and the outer sheath 9, the mechanical properties of the cable are improved and the cable core 1 is protected. The cable has good flame retardant and fire-resistant properties, can operate normally in case of fire, and prolongs the cable operation time, and has high safety and environmental protection.
[0034] refer to Figure 2 The cable core 1 in the utility model includes a copper conductor 11, a first shielding layer 12, an insulating layer 13, a second shielding layer 14 and a metal shielding layer 15 which are arranged in sequence from the inside to the outside, wherein the first shielding layer 12 includes a semi-conductive conductor shielding layer, the second shielding layer 14 includes a semi-conductive insulating shielding layer, and the insulating layer 13 includes a cross-linked polyolefin insulating layer 13.
[0035] Among them, the copper conductor 11 is a soft copper conductor, which mainly plays the role of transmitting electric energy. The semi-conductive conductor shielding layer is used to balance the electric field, and is at the same potential as the soft copper conductor, so as to avoid local discharge between the soft copper conductor and the insulating layer 13. The cross-linked polyolefin insulating layer 13 is mainly used to prevent the current from diffusing outward, so that the current is transmitted in one direction, and protect the soft copper conductor from being corroded and damaged. The semiconductor insulating shielding layer is also used to balance the electric field, and is at the same potential as the metal shielding layer 15, so as to avoid local discharge between the insulating layer 13 and the metal shielding layer 15. The metal shielding layer 15 mainly plays the role of shielding the electric field and transmitting short-circuit current.
[0036] Furthermore, a reinforcement piece is provided at the center of the cable core 1 to improve the mechanical properties of the cable.
[0037] The cable in the utility model also includes a waterproof layer 4, which is arranged between the fire-resistant filling unit 2 and the inner sheath 5; during the installation and operation of the cable, moisture is prevented from radially entering the cable core 1, and when burning in the event of a fire, oxygen can be isolated to prevent oxygen from entering as a combustion aid, effectively preventing flames from entering the cable core 1, and ensuring safe and reliable operation of the circuit.
[0038] The cable provided by the utility model further includes a first wrapping tape 3, which is located between the waterproof layer 4 and the fire-resistant filling unit 2 and is wound around the outer wall of the fire-resistant filling unit 2. The first wrapping tape 3 is used to isolate the fire-resistant filling unit 2 from the waterproof layer 4, which is convenient for construction and laying.
[0039] The cable provided by the utility model also includes a second wrapping tape 6, which is wrapped around the outer wall surface of the inner protective layer 5 and is used to isolate the inner protective layer 5 from the metal armor layer 7, so as to facilitate construction and laying.
[0040] The cable provided by the utility model also includes a third wrapping tape 8, which is wrapped around the outer wall surface of the metal armor layer 7 to isolate the metal armor layer 7 from the outer sheath 9, thereby facilitating construction and laying.
[0041] The first wrapping tape 3, the second wrapping tape 6 and the third wrapping tape 8 in the present invention are all fire-resistant wrapping tapes, which achieve flame retardant and fire-resistant effects, and enhance the flame retardant and fire-resistant effects of the cable.
[0042] The waterproof layer 4 in the utility model comprises an aluminum-plastic composite waterproof layer 4; the metal armor layer 7 comprises a galvanized steel armor layer.
[0043] The refractory layer in the utility model comprises a ceramic refractory layer, which comprises a ceramicized polyolefin member and a ceramicized refractory silicone rubber. When continuously burned at high temperature, a ceramicized crust layer is formed, and the maximum temperature resistance can reach above 1000°C.
[0044] The refractory filling unit 2 in the present invention comprises glass fiber ropes and / or ceramic filling ropes.
[0045] The utility model adds fire-resistant technology on the basis of ordinary fire-resistant cables, has a more reasonable structure and a longer fire-resistant time. The fire-resistant structure using ceramic filling, fire-resistant wrapping and ceramic polyolefin sheath can ensure that the bending radius of the cable itself will not increase when the cable encounters a fire, so that the cable can be laid and operated in a variety of complex environments. When a fire occurs, the cable has a longer effective operation time, the destructive power affected by the fire is smaller, and the cable operation is more stable.
[0046] Compared with the cables in the prior art, the cable of the utility model has excellent fire resistance and waterproof performance. It can continue to work for more than 180 minutes at an external temperature of 950°C, which buys time for rescue on site. In addition, it does not produce toxic gases and large amounts of smoke when burning.
[0047] The cable provided by the utility model can be a medium-voltage fire-resistant power cable with a rated voltage of 6 to 35 kV and is reliable in operation. The structure adopts a fire-resistant + flame-retardant structure, which is flame-retardant, waterproof and fire-resistant from both the inside and the outside of the cable, and effectively controls the flame spread, smoke density, toxicity index and other indicators generated by the flame when the cable burns. The fire-proof performance when a fire occurs makes the cable safe and reliable during long-term operation.
[0048] The cable of the utility model can be applied to high-rise buildings, airport terminals, subway stations and other environments, can improve the safe operation of circuits, and can be used in large quantities in metal processing, mining, railways, and metallurgical industries to ensure the stable operation of the entire operating line, improve the power supply quality, and increase the life of equipment.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A cable, characterized in that: include: A plurality of cable cores, a fire-resistant filling unit, an inner sheath, a metal armor layer and an outer sheath, wherein the plurality of cable cores are arranged inside the inner sheath, and the fire-resistant filling unit is filled between two adjacent cable cores and between the cable core and the inner sheath; the metal armor layer is arranged between the inner sheath and the outer sheath; wherein the inner sheath includes a fire-resistant layer, and the outer sheath includes a member made of a low-smoke, highly flame-retardant, halogen-free polyolefin material; The cable further comprises a waterproof layer, and the waterproof layer is arranged between the fire-resistant filling unit and the inner protective layer.
2. The cable according to claim 1, characterized in that The cable core includes a copper conductor, a first shielding layer, an insulating layer, a second shielding layer and a metal shielding layer arranged in sequence from the inside to the outside, wherein the first shielding layer includes a semiconductive conductor shielding layer, the second shielding layer includes a semiconductive insulating shielding layer, and the insulating layer includes a cross-linked polyolefin insulating layer.
3. The cable according to claim 1, characterized in that The cable further includes a first wrapping tape, which is located between the waterproof layer and the fire-resistant filling unit and is wound around the outer wall surface of the fire-resistant filling unit.
4. The cable according to claim 3, characterized in that The cable also includes a second wrapping tape, which is wrapped around the outer wall surface of the inner sheath.
5. The cable according to claim 4, characterized in that The cable also includes a third wrapping tape, which is wrapped around the outer wall surface of the metal armor layer.
6. The cable according to claim 5, characterized in that The first wrapping tape, the second wrapping tape and the third wrapping tape are all fire-resistant wrapping tapes.
7. The cable according to claim 1, characterized in that The waterproof layer comprises an aluminum-plastic composite waterproof layer; the metal armor layer comprises a galvanized steel armor layer.
8. The cable according to claim 1, characterized in that The refractory layer comprises a ceramic refractory layer, and the ceramic refractory layer comprises a ceramicized polyolefin member and a ceramicized refractory silicone rubber.
9. The cable according to claim 1, characterized in that The refractory filling unit includes glass fiber ropes and / or ceramic filling ropes.