Temperature sensing type super-soft mineral insulated fireproof cable

Abstract

The utility model discloses a temperature sensing type super-soft mineral insulated fireproof cable in the technical field of cables. The temperature sensing type super-soft mineral insulated fireproof cable comprises a temperature measuring wire core, a transmission cable core, a flame-retardant fire-resistant wrapping tape layer, a high-flame-retardant fire-resistant isolation sleeve, a fire-resistant reinforcing protection layer and an environment-friendly outer coating sleeve from inside to outside, the transmission cable core comprises a power transmission wire core and a high-temperature-resistant bidirectional reinforcing composite insulating layer wrapping the power transmission wire core; light fire-resistant flexible filler is filled among the temperature measuring wire cores, the transmission cable core and the flame-retardant fire-resistant belting layer. The temperature sensing type super-soft mineral insulated fireproof cable can meet the normal power transmission work of the cable, and realizes the functions of high-performance power transmission, high temperature resistance, fire prevention, flame retardance, remote temperature detection and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a temperature-sensitive super-flexible mineral insulated fireproof cable. Background Art

[0002] According to recent statistics, over 80% of fires in my country are caused by electrical fires, with 42.7% of these fires stemming from wiring problems. Therefore, early detection and early warning of fires during line maintenance are paramount. Fire-prone locations such as power stations, substations, cable trenches, tunnels, mezzanines, and conveyor belts operate in harsh environments, making early detection difficult. Therefore, specialized cables with temperature sensing and power consumption are needed for early detection and early warning. Temperature sensing cables continuously monitor the temperature of the protected object along the entire length of the cable. They are suitable for use in tunnels, mezzanines, conveyor belts, and other locations. They are stable and reliable, making them suitable for fire detection in harsh environments. They are currently widely used in power stations, substations, oil depots, cable trenches, and cable mezzanines.

[0003] Traditional temperature-sensing cables typically incorporate temperature sensors evenly distributed throughout the cable. This often results in significant power loss, poor high-temperature resistance, and insufficient fire resistance during power transmission. In high-temperature and fire environments, the cable's insulation can easily break, leading to power outages and making remote alarm functionality difficult.

[0004] Therefore, it is particularly important to develop a cable with high performance, high temperature resistance, fire retardancy, remote temperature detection and other functions. Utility Model Content

[0005] This application solves the defects of temperature-sensing cables in the prior art by providing a temperature-sensitive ultra-flexible mineral insulated fire-resistant cable, and realizes functions such as high-performance power transmission, high temperature resistance, fire retardancy, and remote temperature detection.

[0006] The embodiment of the present application provides a temperature-sensitive ultra-flexible mineral insulated fireproof cable, which includes, from the inside to the outside, a temperature measuring core, a transmission cable core, a flame-retardant and fire-resistant tape layer, a highly flame-retardant and fire-resistant isolation sleeve, a fire-resistant reinforced sheath, and an environmentally friendly outer sheath;

[0007] The transmission cable core comprises a power transmission core and a high-temperature resistant bidirectional reinforced composite insulation layer wrapped around the power transmission core;

[0008] Lightweight fire-resistant flexible filling is filled between the temperature measuring wire core, the transmission cable core and the flame-retardant fire-resistant wrapping layer.

[0009] Based on the above embodiments, the present application can be further improved as follows:

[0010] In one embodiment of this application, the power transmission cable core is composed of multiple strands of highly conductive copper wire with a purity of ≥99.99%, and a wire resistivity of ≤0.017241Ω·mm² / m. This material meets the DC resistivity requirements of GB / T 3953-2009. This material effectively conducts electrical energy with minimal losses, while also utilizing Class II conductors to enhance the flexibility of the mineral insulated cable.

[0011] In one embodiment of this application, the high-temperature-resistant, bidirectionally reinforced composite insulation layer is composed of an inorganic mineral insulation tape capable of withstanding temperatures up to 800°C and an insulating material capable of forming a rigid, flame-retardant shell at high temperatures. This layer, while maintaining a high insulation resistance constant, meets the requirements of flame resistance at 950°C for 180 minutes and IP7 water resistance.

[0012] In one embodiment of this application, the lightweight, fire-resistant, flexible filler is composed of a high-twist inorganic flame-retardant filler material with a tensile strength of ≥400N / 20cm, a moisture content of ≤1%, and an oxygen index of ≥35%. This material exhibits excellent properties, such as non-flammability and non-combustion resistance. Furthermore, it can isolate heat transfer at high temperatures, accelerate heat dissipation, and enhance product safety and environmental performance.

[0013] In one embodiment of this application, the flame-retardant and fire-resistant layer consists of a high-density, non-combustible fireproof tape coated on one side with a reactive thermal insulation coating. This tape resists penetration even under high-temperature impacts of 1300°C. Furthermore, the internal core temperature remains below 400°C even after a 950°C flame for 5 minutes, effectively protecting the product's internal operating environment.

[0014] In one embodiment of the present application, the highly flame-retardant fireproof insulation sleeve is formed from an extruded package of highly flame-retardant refractory materials. This highly flame-retardant refractory material has excellent fire-insulating and high-temperature resistance. It undergoes chemical deformation at high temperatures to form a dense fire-resistant protective film, improving the product's heat and fire resistance while also protecting the internal cables.

[0015] In one embodiment of the present application, the fire-resistant reinforcement layer is composed of an inorganic high-fiber material. This reinforcement layer is made of a high-density woven fiber material, which has excellent agglomeration and heat dissipation effects. It also tightly wraps around the highly flame-retardant fireproof insulation sleeve, preventing the insulation sleeve from being damaged or deformed during high-temperature combustion.

[0016] In one embodiment of the present application, the environmentally friendly outer sheath is formed from an extruded, halogen-free, low-smoke, environmentally friendly material. This environmentally friendly outer sheath is halogen-free and highly flame-retardant. It does not extend or support combustion at high temperatures, and does not produce dripping when burned. This ensures both environmental and non-toxic properties and excellent safety.

[0017] In one embodiment of the present application, the temperature measurement cable core utilizes a temperature-sensitive optical fiber, which, from the inside out, consists of a bare optical fiber, a polymer coating, an organic heat-resistant layer, a fiber braid, and an outer sheath. The cable exhibits excellent waterproof and moisture-proof properties, with an allowable tensile force of no less than 1000N long-term and 3000N short-term, a allowable crushing force of no less than 1500N / 10cm long-term and 3000N / 10cm short-term, an allowable impact energy of 5J at five points five times, and an optical power variation rate of less than 0.3dB.

[0018] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0019] 1. This temperature-sensitive ultra-flexible mineral insulated fire-resistant cable can meet the normal power transmission requirements of the cable, and ensures that the product can meet the fire resistance of 950℃ and 180min insulation non-breakdown fire resistance under flame conditions, realizing high-performance power transmission, high temperature resistance, fire retardancy and other functions.

[0020] 2. This temperature-sensitive, ultra-flexible mineral insulated fire-resistant cable can perform remote temperature detection through the temperature measuring core, intelligently grasp the cable operation status and the heat dissipation and heating status of the power line core under high temperature conditions. It is a temperature-sensitive, ultra-flexible mineral insulated fire-resistant cable that integrates electronic and intelligent features. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic structural diagram of a temperature-sensitive ultra-flexible mineral insulated fire-resistant cable in an embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the structure of the temperature measuring wire core in the embodiment of the present application;

[0024] Among them, 1. Power transmission line core, 2. High-temperature resistant bidirectional reinforced composite insulation layer, 3. Lightweight fire-resistant flexible filling, 4. Flame-retardant fire-resistant tape layer, 5. Highly flame-retardant fireproof isolation sleeve, 6. Fire-resistant reinforced protective layer, 7. Environmentally friendly outer sheath, 8. Temperature measurement core, 81. Bare optical fiber, 82. Polymer coating, 83. Organic heat-resistant layer, 84. Fiber braided layer, 85. Outer sheath. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0026] 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.

[0027] In the description of the present invention, it should be noted that the terms "vertical", "peripheral surface", etc. indicate orientations or positional relationships 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 present invention is usually placed when in use. These are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[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] In the description of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in the present invention, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0030] The embodiments of the present application solve the defects of temperature-sensing cables in the prior art by providing a temperature-sensitive ultra-flexible mineral insulated fire-resistant cable, and realize functions such as high-performance power transmission, high temperature resistance, fire retardancy, and remote temperature detection.

[0031] The technical solution in the embodiments of the present application is to solve the above problems, and the overall idea is as follows:

[0032] Example:

[0033] like Figure 1-2As shown, a temperature-sensitive ultra-flexible mineral insulated fire-resistant cable comprises a power transmission core 1, a high-temperature resistant bidirectional reinforced composite insulation layer 2, a lightweight fire-resistant flexible filling 3, a flame-retardant fire-resistant tape layer 4, a high-flame-retardant fire-resistant isolation sleeve 5, a fire-resistant reinforced protective layer 6, an environmentally friendly outer sheath 7, and a temperature measuring core 8; the power transmission core 1 is coated with a high-temperature resistant bidirectional reinforced composite insulation layer 2 (constituting a transmission cable core), and is twisted with the temperature measuring core 8 and the lightweight fire-resistant flexible filling 3 and then fastened by a flame-retardant fire-resistant tape layer 4, the flame-retardant fire-resistant tape layer 4 is coated with a high-flame-retardant fire-resistant isolation sleeve 5, the high-flame-retardant fire-resistant isolation sleeve 5 is coated with a fire-resistant reinforced protective layer 6, and the fire-resistant reinforced protective layer 6 is coated with an environmentally friendly outer sheath 7.

[0034] Specifically:

[0035] The power transmission cable core 1 is composed of multiple strands of highly conductive copper wire with a purity of ≥99.99%, and a resistivity of ≤0.017241Ω·mm² / m. This material meets the DC resistivity requirements of GB / T 3953-2009. This material not only effectively conducts electrical energy, minimizing losses, but also utilizes Class II conductors, enhancing the flexibility of the mineral-insulated cable.

[0036] The high-temperature, bidirectionally reinforced composite insulation layer 2 is composed of an inorganic mineral insulation tape capable of withstanding temperatures up to 800°C and an insulating material that forms a rigid flame-retardant shell at high temperatures. This layer, while maintaining a high insulation resistance constant, meets the requirements of flame resistance at 950°C for 180 minutes and IP7 water resistance. The bidirectional reinforcement improves both fire resistance and water resistance. Insulating materials that can form a shell at high temperatures include ceramicized polyolefins and ceramicized silicone rubber.

[0037] Lightweight, fire-resistant, flexible filler 3 is composed of a high-twist inorganic flame-retardant filler material with a tensile strength of ≥400N / 20cm, a moisture content of ≤1%, an oxygen index of ≥35%, and a twist greater than 30 / m. It offers excellent flame-retardancy and combustion-proof properties. It also insulates heat transfer and accelerates heat dissipation at high temperatures, enhancing product safety and environmental performance.

[0038] The flame-retardant fire-resistant tape layer 4 consists of high-density, non-combustible fire-resistant tape coated on one side with a reactive thermal insulation coating. The density of the tape is >40 for warp yarns and >7 for weft yarns. This ensures that the tape will not develop through holes even under high-temperature impacts of 1300°C. The reactive thermal insulation coating rapidly forms a carbon shell at high temperatures and transfers heat inward, maintaining the internal temperature of the cable core below 400°C under 950°C flame conditions, effectively protecting the product's internal operating environment.

[0039] The highly flame-retardant fireproof isolation sleeve 5 is made of an extruded package of highly flame-retardant refractory materials. This highly flame-retardant refractory material meets the Class A bundled combustion test specified in GB / T18380.33 and has excellent fire-insulating and high-temperature resistance. It undergoes chemical deformation at high temperatures to form a dense fire-resistant protective film, improving the product's heat and fire resistance and protecting the internal cables.

[0040] The fire-resistant reinforcement layer 6 is made of inorganic high-fiber material. This reinforcement layer is made of fiber material with high density and has good astringency and heat dissipation effect. At the same time, it is tightly wrapped around the high flame retardant fireproof isolation sleeve 5 so that the isolation sleeve is not damaged or deformed during high-temperature combustion.

[0041] The environmentally friendly outer sheath 7 is extruded from a halogen-free, low-smoke, environmentally friendly material. This environmentally friendly outer sheath is halogen-free and highly flame-retardant. It does not extend or support combustion at high temperatures, and produces no dripping when burned. This ensures both environmental and non-toxic properties and excellent safety. Under flame combustion, the halogen-free, low-smoke, environmentally friendly material meets the requirements of GB / T 19666: smoke density ≥ 60%, acid gas content ≤ 0.5%, pH ≥ 4.3, and conductivity ≤ 10 μS / mm.

[0042] Temperature measurement core 8 utilizes a temperature-sensitive optical fiber, consisting, from inside to outside, of a bare optical fiber 81, a polymer coating 82, an organic heat-resistant layer 83, a fiber braid 84, and an outer sheath 85. It exhibits excellent waterproof and moisture-proof properties, with an allowable tensile force of no less than 1000N long-term and 3000N short-term, and an allowable crushing force of no less than 1500N / 10cm long-term and 3000N / 10cm short-term. It also withstands an impact energy of 5J at five points five times, and an optical power variation rate of less than 0.3dB.

[0043] The technical solution in the embodiment of the present application, the temperature-sensitive ultra-flexible mineral insulated fire-resistant cable, through material selection and structural design, enables the cable to have the following unique properties:

[0044] 1. This cable solves the problem that traditional mineral insulated cables cannot be produced in fixed lengths due to the limitations of copper pipes. The new structure can meet the requirements of fixed-length cable production.

[0045] 2. The main materials of this cable product are all inorganic and non-magnetic materials, so it can effectively resist external interference.

[0046] 3. The cable uses a temperature measuring wire core as the temperature measuring unit, which can remotely detect the working temperature of the entire cable at all times. There is no deviation within 5km, and the temperature measurement is accurate with a deviation of no more than 0.1℃.

[0047] 4. The cable is made of highly flame-retardant and fire-resistant materials, which can achieve Class A flame retardant effect. Under high temperature conditions, the cable will not burn or spread.

[0048] 5. The overall structure of the cable is dense, strong and durable. It can withstand external forces such as extrusion and impact. It can withstand mechanical shock and spraying under high temperature conditions to keep the cable energized normally.

[0049] 6. Without the use of metal sheath, this cable not only meets the fire resistance characteristics of mineral insulated cables, but also improves the flexibility of the product, with a minimum bending radius of not less than 6D.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A temperature-sensitive ultra-flexible mineral insulated fire-resistant cable, characterized by: From the inside to the outside, it includes temperature measuring wire core, transmission cable core, flame retardant and fire resistant tape layer, high flame retardant and fireproof isolation sleeve, fire resistant reinforced sheath, and environmentally friendly outer sheath; The transmission cable core comprises a power transmission core and a high-temperature resistant bidirectional reinforced composite insulation layer wrapped around the power transmission core; Lightweight fire-resistant flexible filling is filled between the temperature measuring wire core, the transmission cable core and the flame-retardant fire-resistant wrapping layer.

2. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The power transmission line core is composed of multiple strands of copper wires with a purity of ≥99.99%, and the resistivity of the copper wires is ≤0.017241Ω·mm² / m.

3. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The high-temperature resistant bidirectional reinforced composite insulation layer is composed of an inorganic mineral insulation tape that can withstand a high temperature of 800° C. and an insulation material that can form a hard flame-retardant shell at high temperature.

4. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The lightweight fire-resistant flexible filling is composed of a high-twist inorganic flame-retardant filling material. The filling material has a tensile strength of ≥400N / 20cm, a water content of ≤1%, and an oxygen index of ≥35%.

5. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The flame-retardant and fire-resistant tape layer is composed of a high-density non-combustible fire-proof tape, and a single side of the fire-proof tape is coated with a reactive heat-insulating coating.

6. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The highly flame-retardant fireproof isolation sleeve is formed by extruding a highly flame-retardant refractory material.

7. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The fire-resistant reinforcement layer is composed of inorganic high-fiber material.

8. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The environmentally friendly outer sheath is formed by extruding a halogen-free, low-smoke environmentally friendly material.

9. The temperature-sensitive ultra-flexible mineral insulated fire-resistant cable according to claim 1, characterized in that: The temperature measuring wire core is composed of a bare optical fiber, a high polymer coating, an organic temperature-resistant layer, a fiber braiding layer and an outer sheath from the inside to the outside.

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