A high performance flame retardant and fire resistant cable

Abstract

The utility model relates to a high-performance flame-retardant and fire-resistant cable, and relates to the field of cable technology, including a cable core assembly, a limiting assembly and a protective assembly, wherein the cable core assembly includes a plurality of conductor cores and a protective layer, wherein the protective layer is wrapped and arranged on the outer surface of the conductor core, and the limiting assembly includes a limiting strip, a pressure-resistant layer and a limiting plate, wherein the side wall of the limiting plate is provided with a plurality of limiting openings for matching the installation of the protective layer, wherein the limiting openings are arc-shaped, the pressure-resistant layer is arranged on the outer side of the cable core assembly and contacts the outer side wall of the protective layer, the limiting plate is arranged on the inner side wall of the pressure-resistant layer, and the two sides of the protective layer are against the side wall of the limiting plate, and the protective assembly includes an anti-corrosion layer, a flame-retardant layer and a protective sleeve arranged on the outer side of the pressure-resistant layer. The utility model increases the stability of the internal structure of the cable through the limiting assembly, and reduces the probability of dislocation of the internal structure of the cable.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a high-performance flame-retardant and fire-resistant cable. Background Art

[0002] Fire-resistant and flame-retardant cables can maintain the integrity of the circuit in the event of a fire and ensure the safe and normal operation of key emergency systems. They are widely used in fire alarm systems, smoke detection systems, emergency lighting power systems and public broadcasting systems in large shopping malls, hospitals, office spaces, stations, airports, residential buildings and other buildings abroad. In addition, many fire-resistant and flame-retardant cables have low-smoke and halogen-free properties. Low-smoke and halogen-free cables are cables that do not produce toxic smoke and corrosive gases when burned. Such cables usually use halogen-free polymers as insulating materials and halogen-free flame retardants such as magnesium oxide or magnesium hydroxide as flame retardants.

[0003] At present, a Chinese utility model with a publication date of June 24, 2020 and a publication number of CN212380174U discloses an anti-cracking cable, which relates to the field of cable technology, including an outer sheath, a protective layer is provided on the inner side of the outer sheath, a low-temperature resistant sheath is provided on the inner side of the protective layer, an armor layer is provided on the inner side of the low-temperature resistant sheath, a shielding layer is provided on the inner side of the armor layer, an inner sheath layer is provided on the inner side of the shielding layer, a support assembly is provided inside the inner sheath layer, and a conductor is provided on the outer circumference of the support assembly. The anti-cracking cable improves the cold resistance of the power cable by providing a low-temperature resistant sheath, avoids the cable from cracking due to long-term use in a severe cold environment, and greatly improves the service life of the power cable. By providing a protective layer, the cable recovery ability is improved, the cable's compressive resistance is strengthened, and the cable is prevented from cracking due to long-term extrusion. By providing a support assembly, the cable's compressive strength is improved, and multiple conductors are prevented from gathering together, preventing the conductor from cracking and short circuiting.

[0004] However, the current low-smoke halogen-free cables are difficult to constrain the internal structure of the cable, resulting in poor stability of the internal structure of the cable. Under the action of external forces, the internal structure of the cable is easily dislocated and deformed, affecting the normal use of the cable. Summary of the invention

[0005] The utility model provides a high-performance flame-retardant and fire-resistant cable, which can improve the technical problem of poor stability of the internal structure of the cable existing in the related technology.

[0006] The embodiment of the present application provides a high-performance flame-retardant and fire-resistant cable, comprising:

[0007] A cable core assembly, a limiting assembly and a protective assembly, the cable core assembly includes multiple conductor cores and a protective layer, the protective layer is wrapped and arranged on the outer surface of the conductor core, the limiting assembly includes a limiting strip, a pressure-resistant layer and a limiting plate, the side wall of the limiting plate is provided with multiple limiting openings for matching the installation of the protective layer, the limiting openings are arc-shaped, the pressure-resistant layer is arranged on the outside of the cable core assembly and contacts with the outer wall of the protective layer, the limiting plate is arranged on the inner wall of the pressure-resistant layer, and both sides of the protective layer are against the side wall of the limiting plate, and the protective assembly includes an anti-corrosion layer, a flame retardant layer and a protective cover arranged on the outside of the pressure-resistant layer.

[0008] The above-mentioned technical scheme in the embodiment of the present application has at least the following technical effects: during the laying process of the cable, when the cable is subjected to external force, the limit strips and the pressure-resistant layer arranged on the inner and outer sides of the cable core assembly make it difficult for the protective layer to be displaced in the directions of the inner and outer sides of the cable, and the protective layer abuts against the side walls of the limiting opening; while the side walls of the protective layer abut against the side walls of the adjacent protective layers, they also abut against the side walls of the limiting plate, making it difficult for the protective layer to be displaced in the direction perpendicular to the inner and outer sides of the cable, thereby realizing multi-directional limiting. Therefore, the setting of the limit strips, the pressure-resistant layer and the limiting plate achieves the effect of multi-directional limiting of the protective layer, so that when the cable is subjected to external force, the protective layer and the optical fiber are difficult to be displaced, and the arc-shaped limit opening can effectively reduce the probability of dislocation of the protective layer, increase the stability of the internal structure of the cable, and increase the pressure resistance of the cable to a certain extent.

[0009] A high-performance flame-retardant and fire-resistant cable provided in an embodiment of the present application can achieve the effect of multi-directional limiting of the protective layer, so that when the cable is subjected to external force, the protective layer and the optical fiber are difficult to be dislocated, and the arc-shaped limiting opening makes the limiting opening and the side walls of the protective layer fit together, which can effectively reduce the probability of dislocation of the protective layer and increase the stability of the internal structure of the cable. Therefore, when the cable is squeezed, the protective layer is difficult to be dislocated under the protection of the limiting component.

[0010] In some embodiments, a plurality of annular notches are formed on the side wall of the limiting strip, and the side walls on both sides of the annular notches are inclined in opposite directions to form an inclined surface.

[0011] In some embodiments, a steel wire rope reinforcement core is installed on the limiting strip by opening a through hole, and the steel wire rope reinforcement core extends along the length direction of the limiting strip.

[0012] In some embodiments, the protective layer is wrapped with a ceramic polyolefin material, and the pressure-resistant layer is wrapped with a mixed nitrile polyvinyl chloride material.

[0013] In some embodiments, fillers are provided in the gaps between the plurality of protective layers, and the fillers are wrapped with polyethylene material.

[0014] In some embodiments, the anti-corrosion layer is formed by a graphene tube sleeve, the flame retardant layer is made of a magnesium hydroxide halogen-free flame retardant, and the protective sleeve is made of a halogen-free polymer such as cross-linked polyethylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a high-performance flame-retardant and fire-resistant cable provided in an embodiment of the present application;

[0017] Figure 2 For along Figure 1 The cross-sectional structure diagram along the AA line;

[0018] Figure 3 A schematic diagram of the three-dimensional structure of the limit strip provided in an embodiment of the present application.

[0019] Among them, the reference numerals in the figure are:

[0020] 10. Cable core assembly; 11. Conductor core; 12. Protective layer; 20. Limit assembly; 21. Limit strip; 211. Limit opening; 212. Annular notch; 213. Through hole; 22. Compression layer; 23. Limit plate; 24. Steel wire rope reinforcement core; 25. Filling; 30. Protective assembly; 31. Anti-corrosion layer; 32. Flame retardant layer; 33. Protective cover. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0027] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] Fire-resistant and flame-retardant cables can maintain the integrity of the circuit in the event of a fire and ensure the safe and normal operation of key emergency systems. They are widely used in fire alarm systems, smoke detection systems, emergency lighting power systems and public broadcasting systems in large shopping malls, hospitals, office spaces, stations, airports, residential buildings and other buildings abroad. In addition, many fire-resistant and flame-retardant cables have low-smoke and halogen-free properties. Low-smoke and halogen-free cables are cables that do not produce toxic smoke and corrosive gases when burned. Such cables usually use halogen-free polymers as insulating materials and halogen-free flame retardants such as magnesium oxide or magnesium hydroxide as flame retardants.

[0029] However, the current low-smoke halogen-free cables are difficult to constrain the internal structure of the cable, resulting in poor stability of the internal structure of the cable. Under the action of external force, the cable is easily dislocated and deformed, affecting the normal use of the cable. In addition, the internal dislocation and deformation of the cable is difficult to achieve the buffering efficiency of the conductive core, resulting in the cable being easily squeezed and damaged, shortening the service life of the cable and increasing the cost of the cable. Based on this, in order to improve the technical problem of poor stability of the internal structure of the cable existing in the related art, the embodiments of the present application provide the following solution.

[0030] The embodiment of the present application provides a high-performance flame-retardant and fire-resistant cable, including a cable core assembly 10, a limiting assembly 20 and a protective assembly 30, wherein the cable core assembly 10 includes a plurality of conductor cores 11 and a protective layer 12, wherein the protective layer 12 is wrapped and arranged on the outer surface of the conductor core 11; the limiting assembly 20 includes a limiting strip 21, a pressure-resistant layer 22 and a limiting plate 23, and a plurality of limiting openings 211 for cooperating with and installing the protective layer 12 are opened on the side wall of the limiting plate 23, wherein the limiting openings 211 are arc-shaped, the pressure-resistant layer 22 is arranged on the outside of the cable core assembly 10 and contacts the outer wall of the protective layer 12, the limiting plate 23 is arranged on the inner wall of the pressure-resistant layer 22, and the two sides of the protective layer 12 are against the side wall of the limiting plate 23; the protective assembly 30 includes an anti-corrosion layer 31, a flame-retardant layer 32 and a protective sleeve 33 arranged on the outside of the pressure-resistant layer 22.

[0031] As can be seen from the above, the embodiment of the present application provides a high-performance flame-retardant and fire-resistant cable. During the laying process of the cable, when the cable is subjected to external force, the limit strips 21 and the pressure-resistant layer 22 arranged on the inner and outer sides of the cable core assembly 10 make it difficult for the protective layer 12 to be displaced in the directions of the inner and outer sides of the cable, and the protective layer 12 is abutted against the side walls of the limit opening 211; while the side walls of the protective layer 12 are abutted against the side walls of the adjacent protective layer 12, they are also abutted against the side walls of the limit plate 23, making it difficult for the protective layer 12 to be displaced in a direction perpendicular to the inner and outer sides of the cable, thereby achieving multi-directional limiting. Therefore, the setting of the limit strips 21, the pressure-resistant layer 22 and the limit plate 23 achieves the effect of multi-directional limiting of the protective layer 12, so that when the cable is subjected to external force, the protective layer 12 and the optical fiber are difficult to be displaced, and the arc-shaped limit opening 211 can effectively reduce the probability of dislocation of the protective layer 12, increase the stability of the internal structure of the cable, and increase the pressure resistance of the cable to a certain extent.

[0032] In some embodiments, please refer to Figure 3 A plurality of annular notches 212 are formed on the side wall of the limiting strip 21 , and the side walls on both sides of the annular notches 212 are inclined in opposite directions to form an inclined surface.

[0033] With such an arrangement, workers need to bend the cables before conveying them so that they can be easily stored and transported. The limit strip 21 in the cable also needs to have bending properties. When the cable is bent, the side walls on both sides of the annular recess 212 move in a direction close to each other, so that the limit strip 21 can bend; therefore, the setting of the annular recess 212 enables the limit strip 21 to bend, and the side walls on both sides of the annular recess 212 are inclined toward opposite directions between the two to form an inclined surface; when the limit strip 21 is bent, the edges of the side walls on both sides of the annular recess 212 are not likely to abut against each other too early, so that the limit strip 21 can be further bent; therefore, the inclined setting of the side walls on both sides of the annular recess 212 can improve the bending effect of the limit strip 21.

[0034] Optionally, in some embodiments, see Figure 1 to Figure 2 A steel wire rope reinforcement core 24 is installed on the limiting strip 21 through a through hole 213 , and the steel wire rope reinforcement core 24 extends along the length direction of the limiting strip 21 .

[0035] With such arrangement, the steel wire rope is first twisted into strands by multiple layers of steel wires, and then a certain number of strands are twisted into a spiral rope with the rope core as the center. The steel wire rope has high strength, light weight, stable operation, is not easy to break suddenly, and works reliably. Therefore, the arrangement of the steel wire rope reinforcement core 24 can enhance the mechanical strength of the cable, so that the cable can withstand greater tension and pressure.

[0036] Optionally, see Figure 1 to Figure 2A filler 25 is provided in the gaps between the plurality of protective layers 12, and the filler 25 is wrapped with a polyethylene material.

[0037] With this arrangement, polyethylene has good wettability, heat resistance, mechanical strength and toughness, can protect the insulation and core wire of the cable, and prevent the entry of moisture. Therefore, the setting of filling 25 can effectively reduce the probability of moisture accumulation inside the cable, while preventing foreign substances from entering the cable, thereby enhancing the mechanical strength and toughness of the cable.

[0038] Optionally, see Figure 1 to Figure 2 The protective layer 12 is wrapped with a ceramic polyolefin material, and the pressure-resistant layer 22 is wrapped with a mixed nitrile polyvinyl chloride material.

[0039] The ceramic polyolefin in the protective layer 12 has excellent mechanical properties; its hardness and strength are relatively high, it can withstand large loads and stresses, and has good impact resistance. The surface crusting performance of the mixed nitrile polyvinyl chloride in the pressure-resistant layer 22 effectively isolates it from the outside air, so water vapor cannot penetrate, and there is no need to add a vapor barrier layer. The outer wall will not condense and the water absorption rate is low; it has extremely strong qualities of stretching and bending, can withstand tearing and rough force transmission, and will not be damaged under severe conditions. Therefore, the setting of the protective layer 12 and the pressure-resistant layer 22 increases the impact resistance and waterproofness of the cable.

[0040] Optionally, see Figure 1 to Figure 2 The anti-corrosion layer 31 is sleeved on the outer wall of the pressure-resistant layer 22, and the anti-corrosion layer 31 is sleeved by a graphene tube. The flame-retardant layer 32 is sleeved on the outer wall of the anti-corrosion layer 31, and the flame-retardant layer 32 is made of a magnesium hydroxide halogen-free flame retardant. The protective sleeve 33 is sleeved on the outer wall of the flame-retardant layer 32, and the protective sleeve 33 is made of a halogen-free polymer such as cross-linked polyethylene.

[0041] With such a configuration, the graphene in the anti-corrosion layer 31 has extremely high chemical stability and corrosion resistance, and can effectively prevent the metal surface from contacting the external environment, thereby reducing the corrosion of the metal surface; graphene can effectively prevent the metal surface from contacting the external environment, thereby reducing the corrosion of the metal surface; the magnesium oxide generated by the thermal decomposition of magnesium hydroxide in the flame retardant layer 32 is a good refractory material, which can not only cover the surface of the material, but also promote the carbonization of the polymer material to form a carbonized layer to block the entry of heat and air, thereby effectively preventing combustion; compared with ordinary polyethylene, the cross-linked polyethylene in the protective sheath 33 has significantly improved strength and rigidity due to the presence of cross-linking, and has become a common engineering plastic; it has excellent wear resistance and scratch resistance, and is more durable during use; therefore, the configuration of the anti-corrosion layer 31, the flame retardant layer 32 and the protective sheath 33 effectively improves the corrosion resistance, fire resistance and wear resistance of the cable.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high-performance flame-retardant and fire-resistant cable, comprising a cable core assembly (10), a limit assembly (20) and a protective assembly (30), characterized in that: The cable core assembly (10) comprises a plurality of conductor cores (11) and a protective layer (12), wherein the protective layer (12) is wrapped and arranged on the outer surface of the conductor core (11); The limiting assembly (20) comprises a limiting strip (21), a pressure-resistant layer (22) and a limiting plate (23); a plurality of limiting openings (211) for matching with the protective layer (12) are provided on the side wall of the limiting plate (23); the limiting openings (211) are arc-shaped; the pressure-resistant layer (22) is arranged on the outside of the cable core assembly (10) and contacts the outer wall of the protective layer (12); the limiting plate (23) is arranged on the inner wall of the pressure-resistant layer (22); and the two sides of the protective layer (12) are in contact with the side wall of the limiting plate (23); The protective assembly (30) comprises an anti-corrosion layer (31) arranged outside the pressure-resistant layer (22), a flame-retardant layer (32) and a protective sleeve (33).

2. A high performance flame retardant and fire resistant cable according to claim 1, characterized in that: A plurality of annular notches (212) are provided on the side wall of the limiting strip (21), and the side walls on both sides of the annular notches (212) are inclined in opposite directions to each other to form an inclined surface.

3. A high performance flame retardant and fire resistant cable according to claim 2, characterized in that: A steel wire rope reinforcement core (24) is installed on the limiting strip (21) by opening a through hole (213), and the steel wire rope reinforcement core (24) extends along the length direction of the limiting strip (21).

4. A high performance flame retardant and fire resistant cable according to any one of claims 1 to 3, characterized in that: The protective layer (12) is formed by wrapping a ceramic polyolefin material, and the pressure-resistant layer (22) is formed by wrapping a mixed nitrile polyvinyl chloride material.

5. A high performance flame retardant and fire resistant cable according to claim 4, characterized in that: Fillers (25) are provided at the gaps between the plurality of protective layers (12), and the fillers (25) are wrapped with polyethylene material.

6. A high performance flame retardant and fire resistant cable according to claim 1, characterized in that: The anti-corrosion layer (31) is formed by a graphene tube sleeve, the flame retardant layer (32) is made of a magnesium hydroxide halogen-free flame retardant, and the protective sleeve (33) is made of a halogen-free polymer, wherein the halogen-free polymer includes cross-linked polyethylene.

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