Fire-resistant low-voltage electric wire

Abstract

The present application relates to the technical field of cables, and in particular to a fire-resistant low-voltage wire, which comprises a conductor core, an insulation layer, a fire-resistant layer and a sheath layer, which are sequentially arranged from inside to outside; the thickness of the fire-resistant layer ranges between 0 and the maximum value of the thickness of the fire-resistant layer, which is evaluated by a thickness evaluation system. Through the thickness evaluation system, the maximum value of the thickness of the fire-resistant layer is accurately calculated, and the defects of the conventional technology that relies on experience or fixed value design for the thickness of the fire-resistant layer are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a fire-resistant low-voltage electric wire. Background Art

[0002] Fire-resistant wires are specially designed cables that maintain their electrical performance even in high-temperature environments like fires, ensuring uninterrupted power supply to critical equipment or systems. Under certain conditions, fire-resistant wires must be buried underground, such as in emergency power lines or in specialized industrial locations like chemical plants, where fire resistance is a critical requirement.

[0003] The application document with publication number CN204087884U discloses a fire-resistant electric wire, comprising a conductor and a fire-resistant layer of an inorganic material coated on the conductor.

[0004] Existing technologies lack scientific assessment tools to quantitatively evaluate the thickness of the fire-resistant layer, which makes it difficult to verify the reliability of the product in extreme environments (such as high temperature or fire), and may cause the fire-resistant layer design to be inconsistent with actual needs. Summary of the Invention

[0005] The purpose of the present invention is to provide a fire-resistant low-voltage electric wire to address the above-mentioned shortcomings.

[0006] The present invention adopts the following technical solutions:

[0007] A fire-resistant low-voltage electric wire, comprising a conductor core, an insulating layer, a fire-resistant layer, and a sheath layer sequentially arranged from the inside out; the thickness of the fire-resistant layer ranges from 0 to a maximum thickness of the fire-resistant layer, and the maximum thickness of the fire-resistant layer is obtained by evaluating a thickness evaluation system;

[0008] The thickness assessment system assesses the maximum value of the thickness of the refractory layer including: obtaining a refractory layer thickness calculation index based on the density of the refractory layer mixture material, the thermal diffusion factor of the refractory layer, the thermal conductivity of the refractory layer, the maximum temperature tolerable by the refractory layer, the specific heat capacity of the refractory layer and the pressure resistance factor of the refractory layer; and obtaining the maximum value of the refractory layer thickness based on the refractory layer thickness calculation index and the thickness of the insulating layer.

[0009] Optionally, the thickness assessment system includes an information storage module, a detection module, a control module and a communication module; the information storage module is used to store the maximum temperature that the fire-resistant layer can withstand, the total number of mixed materials of the fire-resistant layer and the buried depth of the wire, and transmit them to the control module; the detection module is used to detect and obtain the thickness of the insulation layer, the density of the soil, the density of each mixed material, the volume of each mixed material, the specific heat capacity of the fire-resistant layer and the thermal conductivity of the fire-resistant layer, and transmit them to the control module; the control module obtains the pressure resistance factor of the fire-resistant layer according to the density of the soil and the buried depth of the wire, and obtains the pressure resistance factor of the fire-resistant layer according to the total number of mixed materials of the fire-resistant layer, the density of each mixed material, the volume of each mixed material, the specific heat capacity of the fire-resistant layer and the thermal conductivity of the fire-resistant layer. The density of the mixed material and the volume of each mixed material is used to calculate the density of the refractory layer mixed material; the thermal diffusion factor of the refractory layer is calculated based on the thermal conductivity of the refractory layer, the density of the refractory layer mixed material and the specific heat capacity of the refractory layer; the thickness calculation index of the refractory layer is calculated based on the density of the refractory layer mixed material, the thermal diffusion factor of the refractory layer, the thermal conductivity of the refractory layer, the maximum temperature that the refractory layer can withstand, the specific heat capacity of the refractory layer and the pressure resistance factor of the refractory layer; the maximum thickness of the refractory layer is calculated based on the thickness calculation index of the refractory layer and the thickness of the insulating layer, and the maximum thickness of the refractory layer is transmitted to the communication module; the communication module transmits the maximum thickness of the refractory layer to the user end.

[0010] Optionally, the detection module includes a thickness detection submodule, a density detection submodule, a volume detection submodule, a specific heat capacity detection submodule and a thermal conductivity detection submodule; the thickness detection submodule is used to detect and obtain the thickness of the insulation layer, and transmit it to the control module; the density detection submodule is used to detect and obtain the density of the soil and the density of each mixed material, and transmit it to the control module; the volume detection submodule is used to detect and obtain the volume of each mixed material, and transmit it to the control module; the specific heat capacity detection submodule is used to detect and obtain the specific heat capacity of the refractory layer, and transmit it to the control module; the thermal conductivity detection submodule is used to detect and obtain the thermal conductivity of the refractory layer, and transmit it to the control module.

[0011] Optionally, the thickness detection submodule includes a shooting unit, a preprocessing unit, an edge detection unit and a thickness calculation unit; the shooting unit is used to shoot and obtain an initial image; the preprocessing unit performs denoising on the initial image; the edge detection unit uses an edge detection algorithm to identify the inner and outer boundaries of the insulating layer; the thickness calculation unit obtains the thickness of the insulating layer based on the inner and outer boundaries of the insulating layer and transmits it to the control module.

[0012] Optionally, when the control module calculates the maximum value of the thickness of the refractory layer, the following formula is satisfied:

[0013]

[0014] Among them, Trl maxis the maximum value of the fire-resistant layer thickness, jyc is the insulation layer thickness, and nhc is the calculation index of the fire-resistant layer thickness; σ mix is the density of the refractory layer mixture, rks is the thermal diffusion factor of the refractory layer, rdl is the thermal conductivity of the refractory layer, temp max is the maximum temperature that the refractory layer can withstand, brr is the specific heat capacity of the refractory layer, and yl is the pressure resistance factor of the refractory layer.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. The maximum thickness of the refractory layer is accurately calculated through the thickness assessment system, avoiding the defects of traditional technology that relies on experience or fixed value design for the thickness of the refractory layer;

[0017] 2. The thickness assessment system can comprehensively consider multiple influencing factors to optimize wire design;

[0018] 3. Through the shooting unit, pre-processing unit and edge detection algorithm in the thickness detection submodule, visual inspection technology is used to accurately identify the boundary of the insulation layer and automatically calculate the thickness, thereby improving detection accuracy and reliability.

[0019] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and explanation and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the structure of the detection module in the present invention;

[0022] Figure 3 Schematic diagram of the thickness detection submodule in the present invention;

[0023] Figure 4 It is the effect diagram of the present invention;

[0024] Figure 5 This is a rendering of the second embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only for simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0026] Embodiment 1: This embodiment provides a fire-resistant low-voltage wire, combined with Figures 1 to 4 .

[0027] A fire-resistant low-voltage electric wire, comprising a conductor core, an insulating layer, a fire-resistant layer, and a sheath layer sequentially arranged from the inside out; the thickness of the fire-resistant layer ranges from 0 to a maximum thickness of the fire-resistant layer, and the maximum thickness of the fire-resistant layer is obtained by evaluating a thickness evaluation system;

[0028] The thickness assessment system assesses the maximum value of the thickness of the refractory layer including: obtaining a refractory layer thickness calculation index based on the density of the refractory layer mixture material, the thermal diffusion factor of the refractory layer, the thermal conductivity of the refractory layer, the maximum temperature tolerable by the refractory layer, the specific heat capacity of the refractory layer and the pressure resistance factor of the refractory layer; and obtaining the maximum value of the refractory layer thickness based on the refractory layer thickness calculation index and the thickness of the insulating layer.

[0029] Optionally, the thickness assessment system includes an information storage module, a detection module, a control module and a communication module; the information storage module is used to store the maximum temperature that the fire-resistant layer can withstand, the total number of mixed materials of the fire-resistant layer and the buried depth of the wire, and transmit them to the control module; the detection module is used to detect and obtain the thickness of the insulation layer, the density of the soil, the density of each mixed material, the volume of each mixed material, the specific heat capacity of the fire-resistant layer and the thermal conductivity of the fire-resistant layer, and transmit them to the control module; the control module obtains the pressure resistance factor of the fire-resistant layer according to the density of the soil and the buried depth of the wire, and obtains the pressure resistance factor of the fire-resistant layer according to the total number of mixed materials of the fire-resistant layer, the density of each mixed material, the volume of each mixed material, the specific heat capacity of the fire-resistant layer and the thermal conductivity of the fire-resistant layer. The density of the mixed material and the volume of each mixed material is used to calculate the density of the refractory layer mixed material; the thermal diffusion factor of the refractory layer is calculated based on the thermal conductivity of the refractory layer, the density of the refractory layer mixed material and the specific heat capacity of the refractory layer; the thickness calculation index of the refractory layer is calculated based on the density of the refractory layer mixed material, the thermal diffusion factor of the refractory layer, the thermal conductivity of the refractory layer, the maximum temperature that the refractory layer can withstand, the specific heat capacity of the refractory layer and the pressure resistance factor of the refractory layer; the maximum thickness of the refractory layer is calculated based on the thickness calculation index of the refractory layer and the thickness of the insulating layer, and the maximum thickness of the refractory layer is transmitted to the communication module; the communication module transmits the maximum thickness of the refractory layer to the user end.

[0030] Optionally, the detection module includes a thickness detection submodule, a density detection submodule, a volume detection submodule, a specific heat capacity detection submodule and a thermal conductivity detection submodule; the thickness detection submodule is used to detect and obtain the thickness of the insulation layer, and transmit it to the control module; the density detection submodule is used to detect and obtain the density of the soil and the density of each mixed material, and transmit it to the control module; the volume detection submodule is used to detect and obtain the volume of each mixed material, and transmit it to the control module; the specific heat capacity detection submodule is used to detect and obtain the specific heat capacity of the refractory layer, and transmit it to the control module; the thermal conductivity detection submodule is used to detect and obtain the thermal conductivity of the refractory layer, and transmit it to the control module.

[0031] Optionally, the thickness detection submodule includes a shooting unit, a preprocessing unit, an edge detection unit and a thickness calculation unit; the shooting unit is used to shoot and obtain an initial image; the preprocessing unit performs denoising on the initial image; the edge detection unit uses an edge detection algorithm to identify the inner and outer boundaries of the insulating layer; the thickness calculation unit obtains the thickness of the insulating layer based on the inner and outer boundaries of the insulating layer and transmits it to the control module.

[0032] Optionally, when the control module calculates the maximum value of the thickness of the refractory layer, the following formula is satisfied:

[0033]

[0034] Among them, Trl max is the maximum value of the fire-resistant layer thickness, jyc is the insulation layer thickness, and nhc is the calculation index of the fire-resistant layer thickness; σ mix is the density of the refractory layer mixture, rks is the thermal diffusion factor of the refractory layer, rdl is the thermal conductivity of the refractory layer, temp max is the maximum temperature that the refractory layer can withstand, brr is the specific heat capacity of the refractory layer, and yl is the pressure resistance factor of the refractory layer.

[0035] Optionally, the control module satisfies the following formula during calculation: yl=(9.81×tr)×h;where I is the total number of mixed materials of the refractory layer, md i is the density of the i-th mixed material, tj i is the volume of the i-th mixed material; tr is the density of the soil, and h is the buried depth of the wire.

[0036] When the control module calculates the maximum value of the fire-resistant layer thickness, it refers to the following program code:

[0037]

[0038]

[0039] Specifically, the unit of the maximum thickness of the refractory layer is meter.

[0040] The unit of insulation thickness is meter.

[0041] The unit for calculating the thickness of the refractory layer is meter.

[0042] The unit of density of the refractory layer mixture is kilograms per cubic meter. Since the materials of the refractory layer are mixed, the corresponding mixed density needs to be calculated. The density of the refractory layer mixture can reflect the compactness of the refractory layer mixture. The higher the density value of the refractory layer mixture, the stronger the high temperature resistance, which means that it can absorb more heat, but it also requires a thicker layer to effectively delay the spread of heat, thereby providing longer-term protection. In actual applications, wires are usually not only affected by heat, but may also face external pressure. When the density of the refractory layer mixture is higher, it often means that the material has greater strength. This strength is required to be achieved at a thicker layer to ensure that the material does not deform or damage under high temperature and high pressure. Therefore, the increase in thickness is coordinated with the increase in density to cope with possible external pressure and temperature changes.

[0043] The unit of the thermal diffusion coefficient of the refractory layer is square meters per second. The thermal diffusion coefficient of the refractory layer indicates the speed at which heat spreads from the high-temperature area to the low-temperature area. The larger the value, the faster the heat spreads. A thicker refractory layer is usually required to alleviate heat transfer.

[0044] The unit of thermal conductivity of the refractory layer is watt per meter per Kelvin. The thermal conductivity of the refractory layer reflects the ability of the material to conduct heat. The higher the value of the thermal conductivity of the refractory layer, the faster the heat transfer of the corresponding material. Therefore, a thicker refractory layer is needed to block the transfer of heat.

[0045] The unit of the maximum temperature that the refractory layer can withstand is K.

[0046] The unit of the specific heat capacity of the refractory layer is joule per kilogram per Kelvin. The larger the value of the specific heat capacity of the refractory layer, the higher the ability to delay temperature will be.

[0047] The unit of the pressure resistance factor of the fire-resistant layer is Pascal. This situation mainly takes into account that the environment in which the wires are located is buried in the soil, and the wires will be subjected to the pressure of the soil accordingly.

[0048] The density of each mixed material is in kilograms per cubic meter.

[0049] The volume of each mixed material is in cubic meters.

[0050] The density of soil is measured in kilograms per cubic meter.

[0051] The unit of buried depth of electric wire is meter.

[0052] The above units are only examples, and those skilled in the art may set different units according to actual needs when implementing this solution.

[0053] This embodiment solves the problem that traditional wires cannot evaluate thickness. Through the thickness evaluation system, the maximum thickness of the fire-resistant layer is accurately calculated, avoiding the defects of traditional technology that the thickness of the fire-resistant layer depends on experience or fixed value design.

[0054] Example 2: This example includes all the contents of Example 1, and provides a fire-resistant low-voltage wire, combined with Figure 5 shown.

[0055] A fire-resistant low-voltage electric wire, wherein the information storage module is further used to store the ambient temperature and transmit it to the control module;

[0056] The control module calculates the fire resistance time of the fire resistance layer according to the ambient temperature, the maximum temperature that the fire resistance layer can withstand, the specific heat capacity of the fire resistance layer, the density of the mixture material of the fire resistance layer and the maximum thickness of the fire resistance layer, and transmits the fire resistance time of the fire resistance layer to the communication module;

[0057] The communication module transmits the fire resistance time of the fire resistance layer to the user end.

[0058] Optionally, when the control module calculates the fire resistance time of the fire resistant layer, the following formula is satisfied: Among them, Tf is the refractory time of the refractory layer, temp en The control module calculates the fire resistance time of the fire resistant layer by referring to the following procedures:

[0059]

[0060]

[0061] Specifically, the unit of the fire resistance time of the refractory layer is seconds; the unit of the ambient temperature is Kelvin, which can be understood as the maximum temperature predicted when a fire is detected. By calculating the fire resistance time of the refractory layer, the performance degradation and endurance of the refractory layer in high-temperature environments can be described, and the performance of different refractory layer mixtures can be evaluated.

[0062] Furthermore, based on the calculated fire-resistant time of the fire-resistant layer, the number of layers corresponding to the fire-resistant layer can be calculated according to the following formula: Those skilled in the art may use the “number of layers corresponding to the refractory layer” as a reference value and analyze the actual number of layers of the refractory layer in combination with actual conditions.

[0063] The above units are only examples, and those skilled in the art may set different units according to actual needs when implementing this solution.

[0064] This embodiment solves the problem of traditional power lines being unable to predict fire resistance. By calculating the fire resistance of the fire-resistant layer, it can accurately predict the power supply capacity of the power line in a fire or high-temperature environment. This function provides reliable time guarantee for critical equipment and systems, facilitating the implementation of emergency measures.

[0065] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the scope of protection of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention description and drawings are included in the scope of protection of the present invention. In addition, the elements therein can be updated as technology develops.

Claims

1. A fire-resistant low-voltage electric wire, characterized in that: The electric wire comprises a conductor core, an insulation layer, a fire-resistant layer and a sheath layer which are sequentially wrapped from the inside to the outside; The thickness of the refractory layer ranges from 0 to a maximum thickness of the refractory layer, and the maximum thickness of the refractory layer is obtained by evaluating a thickness evaluation system; The thickness assessment system assesses the maximum value of the thickness of the refractory layer, including: obtaining a calculation index of the thickness of the refractory layer based on the density of the refractory layer mixture, the thermal diffusion factor of the refractory layer, the thermal conductivity of the refractory layer, the maximum temperature tolerable by the refractory layer, the specific heat capacity of the refractory layer, and the pressure resistance factor of the refractory layer; and obtaining the maximum value of the thickness of the refractory layer based on the calculation index of the thickness of the refractory layer and the thickness of the insulating layer; The thickness assessment system includes an information storage module, a detection module, a control module and a communication module; The information storage module is used to store the maximum temperature that the fire-resistant layer can withstand, the total number of mixed materials of the fire-resistant layer and the buried depth of the wires, and transmit them to the control module; The detection module is used to detect and obtain the thickness of the insulation layer, the density of the soil, the density of each mixed material, the volume of each mixed material, the specific heat capacity of the refractory layer and the thermal conductivity of the refractory layer, and transmit the results to the control module; The control module obtains the pressure resistance factor of the fire-resistant layer according to the density of the soil and the buried depth of the wires, obtains the density of the fire-resistant layer mixture according to the total number of fire-resistant layer mixture materials, the density of each mixture material and the volume of each mixture material, obtains the thermal diffusion factor of the fire-resistant layer according to the thermal conductivity of the fire-resistant layer, the density of the fire-resistant layer mixture and the specific heat capacity of the fire-resistant layer, obtains the fire-resistant layer thickness calculation index according to the density of the fire-resistant layer mixture, the thermal diffusion factor of the fire-resistant layer, the thermal conductivity of the fire-resistant layer, the maximum temperature that the fire-resistant layer can withstand, the specific heat capacity of the fire-resistant layer and the pressure resistance factor of the fire-resistant layer, obtains the maximum value of the fire-resistant layer thickness according to the fire-resistant layer thickness calculation index and the thickness of the insulating layer, and transmits the maximum value of the fire-resistant layer thickness to the communication module; the communication module transmits the maximum value of the fire-resistant layer thickness to the user end; When the control module calculates the maximum value of the refractory layer thickness, the following formula is satisfied: ； ； in, is the maximum value of the refractory layer thickness, is the thickness of the insulation layer, Calculate the index of refractory layer thickness; is the density of the refractory mixture, is the thermal diffusion factor of the refractory layer, is the thermal conductivity of the refractory layer, is the maximum temperature that the refractory layer can withstand. is the specific heat capacity of the refractory layer, is the pressure resistance factor of the refractory layer.

2. A fire-resistant low-voltage electric wire according to claim 1, characterized in that: The detection module includes a thickness detection submodule, a density detection submodule, a volume detection submodule, a specific heat capacity detection submodule and a thermal conductivity detection submodule; The thickness detection submodule is used to detect and obtain the thickness of the insulation layer and transmit it to the control module; The density detection submodule is used to detect and obtain the density of the soil and the density of each mixed material, and transmit the density to the control module; The volume detection submodule is used to detect and obtain the volume of each mixed material and transmit it to the control module; The specific heat capacity detection submodule is used to detect and obtain the specific heat capacity of the refractory layer and transmit it to the control module; The thermal conductivity detection submodule is used to detect and obtain the thermal conductivity of the refractory layer and transmit it to the control module.

3. A fire-resistant low-voltage electric wire according to claim 2, characterized in that: The thickness detection submodule includes a shooting unit, a pre-processing unit, an edge detection unit and a thickness calculation unit; The shooting unit is used to shoot and obtain an initial image; The pre-processing unit performs denoising on the initial image; The edge detection unit uses an edge detection algorithm to identify the inner and outer boundaries of the insulation layer; The thickness calculation unit calculates the thickness of the insulation layer according to the inner and outer boundaries of the insulation layer and transmits the calculated thickness to the control module.

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