Cable well lid unfreezing device

Abstract

The utility model discloses a cable well lid unfreezing device which comprises a heating pad, a carbon fiber heating wire is embedded in an inner cavity of the heating pad, a connector is embedded in the surface of the heating pad, the carbon fiber heating wire is electrically connected with the connector, a controller is detachably connected to a port of the connector, a heat insulation layer is arranged at the top of the heating pad, and a heat insulation layer is arranged at the bottom of the heating pad. The bottom of the heating pad is provided with a wear-resistant heat conduction layer. The utility model relates to the technical field of electric power facility maintenance. According to the cable well lid unfreezing device, rapid unfreezing is achieved through heat energy, the efficiency and safety of cable maintenance and overhaul work are remarkably improved, potential safety hazards possibly occurring when an open fire is used for heating a cable well are eliminated, convenience is provided for constructors, and the cable well unfreezing time is greatly shortened. Meanwhile, the device has the advantages of being simple in structure, convenient to operate, safe, reliable and the like, has high practical value and popularization value, and is convenient to carry and maintain through the foldable heating pad.

Description

Technical Field

[0001] This utility model relates to the field of power facility maintenance technology, specifically to a cable well cover thawing device. Background Technology

[0002] With the rapid development of power distribution network construction and renovation projects, the proportion of cable lines is increasing year by year. The complete electrification of urban core areas has become a trend, and the construction of new power distribution networks is shifting from primarily overhead lines to primarily cable lines. This leads to a large number of cable manholes. In northern regions, after temperatures drop below freezing, underground moisture rises and accumulates inside the cable manholes. The contact surface between the manhole ring and cover becomes a point of exchange between cold and warm air. Once the moisture condenses into ice and reaches a certain size, the cable manholes freeze, and the freezing period typically lasts 4-6 months. Opening a frozen cable manhole becomes extremely difficult. Workers need to thaw the manhole cover before entering, but thawing is very time-consuming and labor-intensive. Currently, the common method is to ignite flammable materials such as wood to heat the cover and melt the ice. This thawing process typically takes more than 60 minutes and not only pollutes the environment but also poses significant safety hazards. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a cable well cover thawing device, which solves the problem that cable well covers are easily frozen in cold weather, making them difficult to open.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a cable well cover defrosting device, comprising a heating pad, wherein a carbon fiber heating wire is embedded in the inner cavity of the heating pad, and a connector is embedded in the surface of the heating pad, wherein the carbon fiber heating wire and the connector are electrically connected to each other, and a controller is detachably connected to the port of the connector, wherein a heat insulation layer is provided on the top of the heating pad, and a wear-resistant heat-conducting layer is provided on the bottom of the heating pad.

[0005] Preferably, the controller is connected to an external power supply device.

[0006] Preferably, the heating pad is made of any one of silicone rubber, fluororubber, and perfluoroether rubber.

[0007] Preferably, the heat insulation layer is made of aerogel composite material with a thickness of 3-5 mm.

[0008] Preferably, the wear-resistant and thermally conductive layer is made of silicon nitride ceramic matrix composite material with a thickness of 3-5 mm.

[0009] This utility model provides a device for defrosting cable well covers. Compared with the prior art, it has the following advantages:

[0010] Beneficial effects:

[0011] 1. This cable well cover defrosting device utilizes heat energy for rapid defrosting, significantly improving the efficiency and safety of cable maintenance and repair work. It eliminates potential safety hazards associated with heating cable wells with open flames, provides convenience for construction personnel, and greatly shortens the defrosting time of cable wells. At the same time, the device has advantages such as simple structure, convenient operation, and safety and reliability, and has high practical value and promotion value. Furthermore, the foldable heating pad makes it easy to carry and maintain. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0014] Figure 3 This is a partial schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Heating pad; 2. Insulation layer; 3. Wear-resistant heat-conducting layer; 4. Controller; 5. Carbon fiber heating wire; 6. Connector. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 This utility model provides a technical solution: a cable well cover defrosting device, including a heating pad 1. The heating pad 1 is made of any one of silicone rubber, fluororubber and perfluoroether rubber. Silicone rubber, fluororubber and perfluoroether rubber are all resistant to high temperature. The long-term service temperature can reach 200℃~250℃, and the short-term temperature can reach 300℃. In addition, they have good compressive strength and elasticity. Therefore, the heating pad 1 can be folded and will not be damaged or deformed by being run over or stepped on by light vehicles.

[0018] The heating pad 1 has a carbon fiber heating wire 5 embedded in its inner cavity. The carbon fiber heating wire 5 is arranged in a spiral pattern to make the heat field distribution more uniform. The power density of the carbon fiber heating wire 5 is 2.5W / cm². 2The operating temperature range is 50-120℃ with PID temperature control ±2℃. The surface of the heating pad 1 is inlaid with a connector 6. The carbon fiber heating wire 5 is electrically connected to the connector 6. The port of the connector 6 is detachably connected to the controller 4. When needed, the port of the controller 4 is inserted into the connector 6 and connected to the carbon fiber heating wire 5. The controller 4 is powered by electricity and is equipped with its own battery, or it can be used with an external 220V power supply.

[0019] The heating pad 1 has a heat insulation layer 2 on top. The heat insulation layer 2 is made of aerogel composite material with a thickness of 3-5mm. Aerogel is a nanoporous material with extremely low density and high porosity. It has excellent heat insulation, sound insulation and adsorption properties. Aerogel composite material is usually made by combining aerogel with other materials such as fibers and polymers to enhance its mechanical properties and functionality. The thermal conductivity of aerogel composite material is ≤0.02W / m·K and the surface temperature is ≤40℃. It can insulate heat, prevent energy loss and high temperature injury.

[0020] Furthermore, the bottom of the heating pad 1 is equipped with a wear-resistant and heat-conducting layer 3. This layer 3 is made of silicon nitride ceramic matrix composite material, with a thickness of 3-5 mm and an anti-slip texture on the surface. The coefficient of friction is ≥0.6. Silicon nitride (Si3N4) is a high-performance ceramic material with high hardness, high wear resistance, excellent high-temperature resistance, and chemical stability. Silicon nitride ceramic matrix composite materials are typically made by combining silicon nitride with other materials such as carbon fiber and silicon carbide to improve their toughness and functionality. The silicon nitride ceramic matrix composite material has a hardness ≥HRA90 and a thermal conductivity ≥30W / m·K, thus achieving wear resistance and heat conduction.

[0021] Working principle:

[0022] First, unfold the folded heating pad 1 and lay it flat on the frozen manhole cover, ensuring that the heating pad 1 completely covers the manhole ring. Then, insert the controller 4 port into the connector 6 and connect the controller 4 to the external power supply equipment.

[0023] Then turn on the power and set the target temperature to 80℃ and the time to 8 minutes via controller 4;

[0024] The carbon fiber heating wire 5 inside the heating pad 1 is heated, and the wear-resistant heat-conducting layer 3 set in the lower layer evenly transfers the heat to the well cover, while the upper heat insulation layer 2 prevents the heat from being lost.

[0025] Finally, during the thawing process (e.g., after 5 minutes and 30 seconds), the temperature of the manhole cover rises above 3°C (the freezing point), and the manhole cover can be easily opened.

[0026] After use, the heating pad 1 can be folded and stored to reduce its size, and can be placed in the toolbox of a repair vehicle.

[0027] Thawing time test:

[0028] At an ambient temperature of -20℃, the ice layer on the manhole cover is 10cm thick.

[0029] Turn on heating pad 1 and set the temperature to 80℃ via controller 4. After 8 minutes, the ice layer will completely melt, and the manhole cover can be easily opened.

[0030] Energy consumption test:

[0031] A single thawing operation consumes 0.8 kWh of electricity.

[0032] Compression test:

[0033] When a pressure of 1.8 tons is applied to heating pad 1 for 5 minutes, heating pad 1 shows no deformation and functions normally.

[0034] Thermal insulation performance test:

[0035] During the heating process, the surface temperature of the upper insulation layer 2 is ≤40℃, which meets the human safety contact standard.

[0036] Real-world application scenarios

[0037] Scene description:

[0038] In a northern city, where winter temperatures drop to -15°C, a cable well cover became frozen and could not be opened. Repair crews used this device to thaw it.

[0039] Operating steps:

[0040] Unfold heating pad 1 and lay it flat on the manhole cover;

[0041] Turn on the power and set the temperature to 80℃ and the time to 8 minutes via controller 4;

[0042] Five minutes and 30 seconds later, the temperature of the manhole cover rose to 3°C, the ice melted, and the manhole cover was easily opened.

[0043] After use, the heating pad 1 can be folded and stored in the toolbox of a repair vehicle.

[0044] Effectiveness evaluation:

[0045] The defrosting time has been reduced from 60 minutes using the traditional method to 8 minutes;

[0046] No open flame operations are permitted to eliminate fire hazards;

[0047] The device is portable and easy to use, significantly improving emergency repair efficiency.

[0048] Relationship between ice thickness and heating time:

[0049] Experimental data shows that for every 1 cm increase in ice thickness, the heating time needs to be extended by approximately 45 seconds.

[0050] Compared to traditional flame heating:

[0051] This device reduces thawing time by 80%, energy consumption by 50%, and emits no pollutants.

[0052] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for defrosting cable well covers, comprising a heating pad (1), characterized in that: The heating pad (1) has a carbon fiber heating wire (5) embedded in its inner cavity, and a connector (6) is embedded in the surface of the heating pad (1). The carbon fiber heating wire (5) and the connector (6) are electrically connected to each other. The port of the connector (6) is detachably connected to a controller (4). The top of the heating pad (1) is provided with a heat insulation layer (2), and the bottom of the heating pad (1) is provided with a wear-resistant heat-conducting layer (3).

2. The cable well cover defrosting device according to claim 1, characterized in that: The controller (4) is connected to an external power supply device.

3. The cable well cover thawing device according to claim 1, characterized in that: The heating pad (1) is made of any one of silicone rubber, fluororubber and perfluoroether rubber.

4. The cable well cover thawing device according to claim 1, characterized in that: The heat insulation layer (2) is made of aerogel composite material.

5. The cable well cover thawing device according to claim 1, characterized in that: The wear-resistant and heat-conducting layer (3) is made of silicon nitride ceramic matrix composite material.

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