Flame-retardant shielding cable

Abstract

The utility model provides a flame-retardant shielding cable, which relates to the technical field of wires and cables and comprises a conductor, a first insulating layer, a flame-retardant layer, a second insulating layer and an outer sheath. The first insulating layer wraps the outer side of the conductor, the flame-retardant layer is arranged on the outer side of the first insulating layer, the second insulating layer is arranged on the outer side of the flame-retardant layer, and the outer sheath is arranged on the outer side of the second insulating layer; the first insulating layer is made of quartz fibers, and the second insulating layer is made of a ceramic silica gel wrapping tape. The first insulating layer made of quartz fibers is arranged on the outer side of the conductor, and the ceramic silica gel is arranged on the outer side of the flame-retardant layer, so that the overall fireproof performance of the flame-retardant shielding cable is enhanced, the shielding effect of the flame-retardant shielding cable in a high-temperature environment is ensured, and the problems that in the prior art, a flame-retardant cable is poor in fireproof effect, low in temperature-resistant level of the insulating layer and poor in flame-retardant performance are solved. The technical problem that the cable cannot be used in an ultra-high temperature environment is solved, and the safety of the flame-retardant shielding cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric wires and cables, in particular to a flame-retardant shielded cable. Background Art

[0002] The wire and cable industry is a crucial supporting industry for economic development and is widely used across all sectors of the national economy. In recent years, with the sustained and rapid development of my country's economy and the advancement of urbanization, the wire and cable industry has maintained a high growth rate, correspondingly leading to higher requirements for the flame retardancy and fire resistance of wire and cable. Fire-resistant cables are widely used in high-rise buildings, subways, power plants, nuclear power plants, and other important departments and public places. At the same time, many infrastructure projects are beginning to favor fire-resistant cables to ensure stable and normal operation of power supply systems in the event of a fire, facilitating rescue efforts and minimizing casualties and financial losses. Conventional flame-retardant, low-smoke polymer materials, such as plastics, rubber, and silicone rubber, leave ash residue after combustion. Fire damage to cables can quickly cause short circuits and therefore fail to meet these flame retardancy and fire resistance requirements.

[0003] At present, existing flame-retardant cables generally have flame-retardant fillers on the cable outer layer and cable inner core to improve the fire resistance of the cable, and a mica tape fire-resistant layer is provided on the outside of the cable inner core to ensure the fire resistance of the flame-retardant cable.

[0004] However, the mica tape of existing flame-retardant cables becomes brittle and easily falls off after being burned, resulting in poor fire resistance, making it difficult to ensure the safe and smooth flow of communications and electricity in the event of a fire. At the same time, the insulation layer has a low temperature resistance level and cannot meet the requirements of use in ultra-high temperature environments. Utility Model Content

[0005] The purpose of the utility model is to provide a flame-retardant shielded cable to solve the technical problems in the prior art that the mica tape of the flame-retardant cable becomes brittle and easily falls off after being burned, resulting in poor fire resistance, making it difficult to ensure the safe and smooth flow of communications and electricity in the event of a fire. At the same time, the temperature resistance level of the insulation layer is low, which cannot meet the technical problems of use in ultra-high temperature environments.

[0006] In a first aspect, the present invention provides a flame-retardant shielded cable comprising a conductor, a first insulating layer, a flame-retardant layer, a second insulating layer and an outer sheath;

[0007] The first insulating layer is wrapped around the outside of the conductor, the flame retardant layer is arranged on the outside of the first insulating layer, the second insulating layer is arranged on the outside of the flame retardant layer, and the outer sheath is arranged on the outside of the second insulating layer;

[0008] The first insulating layer is configured as quartz fiber, and the second insulating layer is configured as ceramic silicone wrapping tape.

[0009] Furthermore, the flame-retardant shielded cable also includes a first braided layer, and the first braided layer is wrapped around the second insulating layer.

[0010] Furthermore, the conductor, the first insulating layer, the flame-retardant layer, the second insulating layer and the first braided layer cooperate to form an insulating core, and multiple strands of the insulating core are evenly arranged in the outer sheath.

[0011] Furthermore, the flame-retardant shielded cable also includes filling ropes, and a plurality of the filling ropes are arranged between the insulating cores.

[0012] Furthermore, the material of the filling rope is set to be quartz fiber.

[0013] Furthermore, the conductor is configured to be made of twisted high-temperature resistant alloy wires or pure nickel wires.

[0014] Furthermore, the material of the flame retardant layer is set to be fire-resistant mica tape.

[0015] Furthermore, the flame-retardant shielded cable also includes a wrapping layer, which is wrapped around the outside of the filling rope and the insulating core.

[0016] Furthermore, the flame-retardant shielded cable further includes a second braided layer, which is arranged on the outside of the wrapping layer, and the outer sheath is arranged on the outside of the second braided layer.

[0017] Furthermore, the outer sheath is made of braided stainless steel wire.

[0018] Compared with the prior art, the present invention provides a flame-retardant shielded cable, comprising a conductor, a first insulating layer, a flame-retardant layer, a second insulating layer and an outer sheath; the first insulating layer is wrapped around the outside of the conductor, the flame-retardant layer is arranged on the outside of the first insulating layer, the second insulating layer is arranged on the outside of the flame-retardant layer, and the outer sheath is arranged on the outside of the second insulating layer; the first insulating layer is arranged as quartz fiber, and the second insulating layer is arranged as ceramic silicone wrapping tape; by arranging a first insulating layer of quartz fiber on the outside of the conductor and arranging a second insulating layer of ceramic silicone on the outside of the flame-retardant layer, the overall fire resistance of the flame-retardant shielded cable is enhanced, and the shielding effect of the flame-retardant shielded cable in a high temperature environment is guaranteed, solving the problem in the prior art that the mica tape of the flame-retardant cable becomes brittle and easy to fall off after being burned, resulting in poor fire resistance, making it difficult to ensure the safe and smooth communication and electricity in the event of a fire, and at the same time, the temperature resistance level of its insulating layer is low, which cannot meet the technical problems of use in ultra-high temperature environments, thereby improving the safety of the flame-retardant shielded cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural cross-sectional view of a flame-retardant shielded cable provided in an embodiment of the present utility model.

[0021] Reference numerals:

[0022] 100, conductor; 200, first insulation layer; 300, flame retardant layer; 400, second insulation layer; 500, first braided layer; 600, filling rope; 700, wrapping layer; 800, second braided layer; 900, outer sheath. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] 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 rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0028] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0030] like Figure 1 As shown, an embodiment of the utility model provides a flame-retardant shielded cable, including a conductor 100, a first insulating layer 200, a flame-retardant layer 300, a second insulating layer 400 and an outer sheath 900; the first insulating layer 200 is wrapped around the outside of the conductor 100, the flame-retardant layer 300 is arranged on the outside of the first insulating layer 200, the second insulating layer 400 is arranged on the outside of the flame-retardant layer 300, and the outer sheath 900 is arranged on the outside of the second insulating layer 400; the first insulating layer 200 is set as quartz fiber, and the second insulating layer 400 is set as ceramic silicone wrapping tape.

[0031] That is, the embodiment of the present invention provides a flame-retardant shielded cable, which enhances the overall fire resistance of the flame-retardant shielded cable and ensures the shielding effect of the flame-retardant shielded cable in a high-temperature environment by arranging a first insulating layer 200 of quartz fiber on the outside of the conductor 100 and arranging ceramic silicone on the outside of the flame-retardant layer 300. It solves the problem in the prior art that the mica tape of the flame-retardant cable becomes brittle and easy to fall off after being burned, resulting in poor fire resistance, making it difficult to ensure the safe and smooth operation of communications and electricity in the event of a fire. At the same time, the insulation layer has a low temperature resistance level and cannot meet the technical problems of use in ultra-high temperature environments, thereby improving the safety of the flame-retardant shielded cable.

[0032] Specifically, the cross-section of the flame-retardant shielded cable is circular, and the first insulating layer 200, the flame-retardant layer 300, and the second insulating layer 400 are wrapped around the outside of the conductor 100 in sequence. The first insulating layer 200 is made of quartz fiber, which is a flexible inorganic fiber material with high temperature resistance and good dielectric properties among inorganic fibers. Moreover, its electrical insulation properties are also very excellent under high temperature and high frequency conditions. It is non-hygroscopic and has excellent mechanical properties. The long-term use temperature can reach 1200°C, and the softening point temperature is as high as 1700°C. At the same time, it has high electrical insulation properties, ablation resistance, thermal shock resistance, excellent dielectric properties and good chemical stability. The second insulating layer 400 is configured as a ceramic silicone tape, which is wrapped around the outside of the flame-retardant layer 300. It can be wrapped with one or more layers. In this embodiment, the ceramic silicone tape of the second insulating layer 400 is wrapped around the flame-retardant layer 300 in two layers. Ceramic silicone tape offers high strength, excellent mechanical properties, and superior electrical insulation. While retaining all the properties of silicone rubber at room temperature, it transforms into an inorganic ceramic material at high temperatures. In the event of a fire, the "ceramicized" hard shell provides excellent flame retardancy, fire resistance, fire prevention, and fire isolation, reaching temperatures up to 3000°C, effectively ensuring smooth circuit operation. Thus, the first insulating layer 200, the flame-retardant layer 300, and the second insulating layer 400 form a multi-layer composite insulation and fire-resistant layer, enabling flame-retardant shielded cables to be used in high-temperature environments for extended periods.

[0033] Preferably, the flame-retardant shielded cable further includes a first braided layer 500 , which is wrapped around the second insulating layer 400 .

[0034] Specifically, the first braided layer 500 is configured to be quartz fiber braided with a braiding density greater than 90%. After high-temperature sintering, the fibers are not loose, and the fibers are wrapped around the outside of the second insulating layer 400 to further ensure tight insulation between the conductor 100, the first insulating layer 200, the flame retardant layer 300, and the second insulating layer 400.

[0035] Furthermore, the conductor 100 , the first insulating layer 200 , the flame-retardant layer 300 , the second insulating layer 400 and the first braided layer 500 cooperate to form an insulated wire core, and multiple strands of the insulated wire core are evenly arranged in the outer sheath 900 .

[0036] Specifically, in this embodiment, the insulated core is provided with four strands, which are arranged in a circumferential array within the outer sheath 900, thereby ensuring the communication quality of the flame-retardant shielded cable and improving the overall tensile performance of the flame-retardant shielded cable.

[0037] Preferably, the flame-retardant shielded cable further includes filling ropes 600 , and a plurality of filling ropes 600 are arranged between the insulating cores.

[0038] Specifically, in this embodiment, the filling cord 600 is provided with five strands, which are evenly arranged between the insulating cores. By providing the filling cord 600 between the insulating cores, the roundness of the cable can be improved.

[0039] Furthermore, the material of the filling rope 600 is set to be quartz fiber.

[0040] Specifically, the filling rope 600 is made of twisted quartz fibers, which have good high temperature resistance and can further improve the fire resistance of the flame-retardant shielded cable.

[0041] Furthermore, the conductor 100 is configured to be made of twisted high-temperature resistant alloy wires or pure nickel wires.

[0042] Specifically, in this embodiment, the conductor 100 is made of pure nickel wire. Nickel has good temperature resistance and can be used in high temperature environments. Nickel also has good electrical conductivity and can be used in acid, alkali and high temperature environments without being easily corroded or oxidized.

[0043] Furthermore, the material of the flame retardant layer 300 is set to be fire-resistant mica tape.

[0044] Specifically, the fire-resistant mica tape layer is wrapped around the outside of the first insulating layer 200. The mica tape is an excellent flame-retardant and fire-resistant material with good flame-retardant and fire-resistant effects. The mica tape can also play an insulating role and can still maintain excellent dielectric strength at high temperatures.

[0045] Furthermore, the flame-retardant shielded cable further includes a wrapping layer 700 , which is wrapped around the outside of the filling rope 600 and the insulating core.

[0046] Specifically, in this embodiment, the wrapping layer 700 is provided with ceramic silicone tape. Ceramic silicone tape has high strength and excellent mechanical properties. In the event of a fire, the "ceramicized" hard shell can provide excellent flame retardancy, fire resistance, fire prevention, and fire isolation, with a maximum temperature of 3000°C, effectively ensuring the smooth operation of the line. By wrapping the ceramic silicone tape around the outside of the filling rope 600 and the insulating core, the fire resistance of the flame-retardant shielded cable can be further improved.

[0047] Furthermore, the flame-retardant shielded cable further includes a second braided layer 800 , which is disposed on the outside of the wrapping layer 700 , and the outer sheath 900 is disposed on the outside of the second braided layer 800 .

[0048] Specifically, it is set to be quartz fiber braided with a braiding density greater than 90%. After high-temperature sintering, the fiber is not loose, and it is wrapped around the outer side of the wrapping layer 700 to further ensure the insulation of the insulating core and the filling rope 600 is tight.

[0049] Furthermore, the outer sheath 900 is made of braided stainless steel wire.

[0050] Specifically, outer sheath 900 is woven from stainless steel wire. The stainless steel wire armor offers excellent abrasion resistance, effectively protecting the insulation structure from mechanical damage. This increases the mechanical strength and tensile strength of the wires and cables, ensuring their reliability. Stainless steel also offers excellent corrosion resistance and shielding properties, effectively shielding against signal interference.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame retardant shielded cable, characterized in that: It comprises a conductor (100), a first insulating layer (200), a flame retardant layer (300), a second insulating layer (400) and an outer sheath (900); The first insulating layer (200) is wrapped around the outside of the conductor (100), the flame retardant layer (300) is arranged on the outside of the first insulating layer (200), the second insulating layer (400) is arranged on the outside of the flame retardant layer (300), and the outer sheath (900) is arranged on the outside of the second insulating layer (400); The first insulating layer (200) is configured as quartz fiber, and the second insulating layer (400) is configured as a ceramic silicone wrapping tape.

2. The flame-retardant shielded cable according to claim 1, characterized in that: The flame-retardant shielded cable further comprises a first braided layer (500), wherein the first braided layer (500) is wrapped around the second insulating layer (400).

3. The flame-retardant shielded cable according to claim 2, characterized in that: The conductor (100), the first insulating layer (200), the flame retardant layer (300), the second insulating layer (400), and the first braided layer (500) cooperate to form an insulating core, and multiple strands of the insulating core are evenly arranged in the outer sheath (900).

4. The flame-retardant shielded cable according to claim 3, characterized in that: The flame-retardant shielded cable further comprises a filling rope (600), and a plurality of the filling ropes (600) are arranged between the insulating cores.

5. The flame-retardant shielded cable according to claim 4, characterized in that: The material of the filling rope (600) is set to be quartz fiber.

6. The flame-retardant shielded cable according to any one of claims 1 to 5, characterized in that: The conductor (100) is made of twisted high-temperature resistant alloy wires or pure nickel wires.

7. The flame-retardant shielded cable according to any one of claims 1 to 5, characterized in that: The material of the flame retardant layer (300) is set to be fire-resistant mica tape.

8. The flame-retardant shielded cable according to claim 4, characterized in that: The flame-retardant shielded cable further comprises a wrapping layer (700), wherein the wrapping layer (700) is wrapped around the outside of the filling rope (600) and the insulating core.

9. The flame-retardant shielded cable according to claim 8, characterized in that: The flame-retardant shielded cable further comprises a second braided layer (800), the second braided layer (800) being arranged on the outside of the wrapping layer (700), and the outer sheath (900) being arranged on the outside of the second braided layer (800).

10. The flame-retardant shielded cable according to claim 9, characterized in that: The outer sheath (900) is made of braided stainless steel wire.

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