A protection device for underground coal mine transient electromagnetic advanced detection equipment

Abstract

This invention relates to the field of coal mine safety and mine geological exploration technology, and discloses a protective device for transient electromagnetic early detection equipment in coal mines. The device includes a protective box, a cooling assembly, and a dehumidification assembly. The protective box has an opening at the top and is equipped with a detachable end cap. A support unit is connected to the lower end of the protective box. The cooling assembly includes an inlet pipe, an outlet pipe, a heat exchange pipe, heat exchange plates, and a coolant circulation unit. The inlet pipe and heat exchange pipe are respectively inserted through two opposite side walls of the protective box. The heat exchange pipe has an inlet end and an outlet end. The heat exchange plates are placed above the heat exchange pipe. The coolant circulation unit is connected to the inlet of the inlet pipe and the outlet of the outlet pipe. The dehumidification assembly includes a suction fan installed at the end cap of the protective box and a drying unit installed on one side of the bottom of the protective box. The drying unit includes a box body and a desiccant placed inside the box body. This invention can improve the protection effect of transient electromagnetic detection equipment.

Description

Technical Field

[0001] This invention relates to the fields of coal mine safety and mine geological exploration technology, and in particular to a protective device for transient electromagnetic advanced detection equipment in underground coal mines. Background Technology

[0002] Transient electromagnetic method (TEM) is a method that uses an ungrounded or grounded source to emit a single pulse magnetic field into the ground. During the intervals between the pulses, the resistivity of the medium can be detected. This method is sensitive to low-resistivity bodies and can identify water-bearing geological features such as karst caves and passages, coal mine goafs, and deep irregular water bodies. It has many advantages. The underground environment of coal mines is harsh, with multiple challenges such as rockfalls, strong electromagnetic interference, high humidity, coal dust, and flammable and explosive gases. These pose a serious threat to the stable operation of transient electromagnetic advanced detection equipment. Before coal mine tunneling operations, the detection equipment, under the protection of protective devices, can accurately detect the geological structure and water distribution ahead, providing a reliable basis for safe production and reducing the risk of water inrush accidents.

[0003] For the protection of transient electromagnetic detection equipment, given the harsh environment of coal mines, which are often characterized by high temperature, high humidity, and limited space, effective protection is required even in confined spaces. Currently, common protective devices typically involve direct placement or support brackets. Some solutions incorporate pluggable mounting legs at the bottom of the equipment to adapt to different ground conditions. Considering the high temperature and humidity environment underground, transient electromagnetic detection equipment is often placed inside a protective enclosure to isolate it from the outside environment and achieve heat insulation. Some protective enclosures have open sections where fans are installed to force heat out. Due to the high humidity, some enclosures also include desiccants inside to absorb moisture.

[0004] However, current protective devices have simple structures and are not very effective at protecting specially designed transient electromagnetic detection equipment. Specifically, because the special transient electromagnetic devices used in underground coal mines need to achieve multi-component detection or enhance signal strength, they often adopt a dual-transmitter opposing layout or a centralized arrangement of the main board with integrated transceiver. This results in the main heating element forming a frame-shaped heat source characteristic of "high heat on the outer ring and secondary heat on the inner ring" along the bottom perimeter. Although existing protective devices can provide short-term heat insulation and moisture protection, with prolonged use, the temperature of the protective box will also rise in the high temperature and humidity environment. Some hot air currents will still enter the protective box, and the desiccant is prone to failure. There is no rapid cooling measure for the heat emitted by the heating element in the transient electromagnetic detection equipment located in special positions, thus forming a vicious cycle of damp heat inside the protective box, which increases the risk of damage to the transient electromagnetic detection equipment due to poor protection. Summary of the Invention

[0006] This invention provides a protective device for transient electromagnetic advance detection equipment in coal mines, which can improve the protection effect of transient electromagnetic detection equipment.

[0007] This invention provides a protective device for transient electromagnetic advance detection equipment in coal mines, comprising: a protective box, a cooling assembly, and a dehumidification assembly. The protective box has an opening at the top and is equipped with a detachable end cap. A support unit is connected to the lower end of the protective box. The cooling assembly includes an inlet pipe, an outlet pipe, a heat exchange pipe, heat exchange fins, and a coolant circulation unit. The inlet pipe and the heat exchange pipe are respectively inserted through two opposite side walls of the protective box. The heat exchange pipe includes an inlet end and an outlet end, with the inlet end communicating with the inlet pipe and the outlet end communicating with the outlet pipe. The top of the heat exchange pipe is planar, and its extension path passes through the heating element of the detection equipment. Below, heat exchange plates are placed above heat exchange tubes to transfer heat from the heating elements in the detection equipment to the heat exchange tubes. The coolant circulation unit is connected to the inlet of the inlet pipe and the outlet of the outlet pipe to transport the cooled coolant and recover the high-heat coolant from the heat exchange. The dehumidification assembly includes a suction fan installed on the end cover of the protective box and a drying unit installed on one side of the bottom of the protective box. The drying unit includes a box and a desiccant placed inside the box. As the suction fan draws in, the moisture inside the protective box is extracted, and dry air is continuously delivered under negative pressure. The heat exchange plates have multiple guide holes for allowing dry air to pass through them.

[0008] Preferably, the heat exchange tube is in the shape of a vortex disk, and the area of ​​the lower surface of the heat exchange plate that is in contact with the heat exchange tube accounts for 4 / 5 to 9 / 10 of the area of ​​the lower surface of the heat exchange plate.

[0009] Preferably, the heat exchange tube has a triangular structure with a flat upper part and a pointed lower part, or a semi-circular structure with a flat upper part.

[0010] Preferably, the upper plane inside the heat exchange tube has flow-blocking fins extending longitudinally to improve the heat exchange effect.

[0011] Preferably, the lower surface of the heat exchange tube is in contact with the bottom inner wall of the protective box, and a vortex-shaped channel cavity is formed between the heat exchange tube, the heat exchange plate and the protective box. The section of the heat exchange tube near the outlet end extends downward, and the protective box has a groove corresponding to the section of the tube.

[0012] Preferably, the guide holes are distributed in the middle of the heat exchange fins so that the dry air can be fully cooled around the channel cavity to dynamically replace the humid and hot gas in the protective box.

[0013] Preferably, the coolant is an aqueous solution of ethylene glycol or an aqueous solution of propylene glycol.

[0014] Preferably, the support unit includes multiple detachable legs, which are respectively located at each corner of the protective box, and the lower end of the legs is a conical structure that can extend into the soil.

[0015] Preferably, the lower part of the protective box is provided with N magnetic blocks corresponding to each leg, and the legs are also provided with S magnetic blocks corresponding to the magnetic blocks.

[0016] Preferably, the coolant circulation unit includes a delivery pump, a cooling tank for holding coolant, and a radiator fan for physically cooling the cooling tank.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention works synergistically from three dimensions: heat source conduction, coolant circulation, and airflow organization. It not only specifically solves the heat dissipation problem of frame-type heat sources, but also realizes active and continuous control of humidity inside the protective box. This greatly improves the operational stability and service life of transient electromagnetic detection equipment in harsh mining environments, avoids equipment damage and detection data distortion caused by protection failure, and provides reliable technical support for safe coal mine production.

[0018] This invention, through the synergistic cooperation of a protective enclosure, a cooling component, and a dehumidification component, effectively solves the technical problem of existing protective devices' inability to provide long-term, targeted cooling and dehumidification for transient electromagnetic detection equipment in the high-temperature and high-humidity environment of underground coal mines. It is particularly effective for the frame-shaped heat source characteristics of dual-transmitter opposing layouts or integrated transceiver motherboards, which exhibit "high heat on the outer ring and secondary heat on the inner ring." This invention achieves rapid and precise local cooling and overall environmental humidity control. Specifically, the top of the heat exchange tube in the cooling component is planar, and its extension path passes directly below the heating element of the detection equipment. Combined with the heat exchange fins, direct contact heat transfer allows for efficient transfer of the heat generated by the heating element to the coolant within the heat exchange tube. The coolant circulation unit continuously delivers low-temperature coolant and... The high-temperature coolant is recycled to form a forced convection heat exchange cycle, which significantly reduces the operating temperature of the heating element. At the same time, the dehumidification component actively extracts the hot and humid air from the protective box through the suction fan at the end cover, creating a negative pressure inside the box. Outside air is then drawn in after the desiccant in the bottom drying unit absorbs moisture and becomes dry air, achieving dynamic replacement of moisture inside the box. Meanwhile, multiple guide holes on the heat exchange plate allow the dry air to pass through the heat exchange plate and be evenly distributed to all areas of the box, avoiding short-circuiting of dry air. This effectively breaks the dead cycle of hot and humid air, prevents the desiccant from rapidly degrading due to long-term exposure to a high-temperature and high-humidity environment, and cools the dry air to a low-temperature level as much as possible to achieve an overall temperature reduction inside the protective box. Attached Figure Description

[0020] Figure 1 This is a partial structural schematic diagram of a protective device for a transient electromagnetic advance detection equipment in an underground coal mine, provided by an embodiment of the present invention. Figure 2 This is a top-view structural diagram of a protective device for a transient electromagnetic advance detection equipment in an underground coal mine, provided by an embodiment of the present invention. Figure 3 This is a schematic diagram of the cyclic connection of a protective device for a transient electromagnetic advance detection equipment in an underground coal mine, provided by an embodiment of the present invention. Figure 4 A top-view structural diagram of a protective device for a transient electromagnetic advance detection equipment in a coal mine, provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a heat exchange tube in a first embodiment of a protective device for a transient electromagnetic advance detection equipment in an underground coal mine, provided by an embodiment of the present invention. Figure 6 This is a schematic diagram of the second embodiment of a heat exchange tube for a protective device used in a transient electromagnetic advance detection device in an underground coal mine, provided by an embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of a protective device for a transient electromagnetic advance detection device in a coal mine, provided as an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Protective box; 11. Settling tank; 2. End cap; 3. Cooling assembly; 31. Inlet pipe; 32. Outlet pipe; 33. Heat exchange tube; 331. Baffle fins; 34. Heat exchange plate; 341. Flow guide hole; 4. Dehumidification assembly; 41. Suction fan; 42. Box body; 5. Channel cavity; 6. Support leg; 7. Transfer pump; 8. Cooling box; 9. Radiator fan. Detailed Implementation

[0022] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] refer to Figure 1 , Figure 2 and Figure 4This invention provides a protective device for transient electromagnetic advance detection equipment in coal mines, comprising: a protective box 1, a cooling assembly 3, and a dehumidification assembly 4. The protective box 1 has an opening at the top and is equipped with a detachable end cap 2. A support unit is connected to the lower end of the protective box 1. The cooling assembly 3 includes an inlet pipe 31, an outlet pipe 32, a heat exchange pipe 33, heat exchange plates 34, and a coolant circulation unit. The inlet pipe 31 and the heat exchange pipe 33 are respectively inserted through two opposite side walls of the protective box 1. The heat exchange pipe 33 includes an inlet end and an outlet end. The inlet end is connected to the inlet pipe 31, and the outlet end is connected to the outlet pipe 32. The top of the heat exchange pipe 33 is planar, and its extension path passes directly below the heating element of the detection equipment. The heat exchange plate 34 is placed above the heat exchange tube 33 to transfer the heat from the heating element in the detection device to the heat exchange tube 33. The coolant circulation unit is connected to the inlet of the inlet pipe 31 and the outlet of the outlet pipe 32 to transport the cooled coolant and recover the high-heat coolant from the heat exchange. The dehumidification component 4 includes a suction fan 41 installed on the end cover 2 of the protective box 1 and a drying unit installed on one side of the bottom of the protective box 1. The drying unit includes a box 42 and a desiccant placed in the box 42. With the suction of the suction fan 41, the moisture in the protective box 1 is extracted and dry air is continuously transported under negative pressure. The heat exchange plate 34 has a plurality of guide holes 341 for allowing dry air to pass through the heat exchange plate 34.

[0025] In the above embodiments, the present invention, through the coordinated operation of the protective box 1, the cooling component 3, and the dehumidification component 4, can effectively solve the technical problem of existing protective devices being unable to provide long-term, targeted cooling and dehumidification for transient electromagnetic detection equipment in the high-temperature and high-humidity environment of underground coal mines. Especially for the frame-type heat source characteristics of "high heat in the outer ring and secondary heat in the inner ring" formed by a dual-transmitter opposing layout or a transceiver integrated motherboard, it achieves rapid and precise local cooling and overall environmental humidity control. Specifically, the top of the heat exchange tube 33 in the cooling component 3 is planar, and its extension path passes directly below the heating element of the detection equipment. Combined with the heat exchange plate 34, it directly contacts the heat for heat transfer, efficiently transferring the heat generated by the heating element to the coolant in the heat exchange tube 33. The coolant circulation unit continuously delivers low-temperature cooling. The system recovers the high-temperature coolant, forming a forced convection heat exchange cycle, which significantly reduces the operating temperature of the heating element. At the same time, the dehumidification component 4 actively extracts the humid and hot air from the protective box 1 through the suction fan 41 at the end cover 2, creating a negative pressure inside the box. Outside air is then drawn in after the desiccant in the bottom drying unit absorbs moisture and becomes dry air, achieving dynamic replacement of moisture inside the box. Meanwhile, multiple guide holes 341 on the heat exchange plate 34 allow the dry air to pass through the heat exchange plate 34 and be evenly distributed to various areas of the box, avoiding short-circuiting of the dry air. This effectively breaks the dead cycle of humid and hot air, prevents the desiccant from rapidly failing due to long-term exposure to a high-temperature and high-humidity environment, and cools the dry air to a low-temperature level to achieve an overall temperature drop inside the protective box 1.

[0026] In summary, this invention works synergistically from three dimensions: heat source conduction, coolant circulation, and airflow organization. It not only specifically solves the heat dissipation problem of frame-type heat sources, but also achieves active and continuous humidity control within the protective box 1. This significantly improves the operational stability and service life of transient electromagnetic detection equipment in harsh mining environments, avoids equipment damage and detection data distortion caused by protection failure, and provides reliable technical support for safe coal mine production.

[0027] Specifically, a sealing strip is provided between the end cap 2 and the protective box 1 to improve the sealing performance.

[0028] Further, refer to Figure 2 The heat exchange tube 33 is vortex-shaped, and the area of ​​the lower surface of the heat exchange plate 34 that is in contact with the heat exchange tube 33 accounts for 4 / 5 to 9 / 10 of the area of ​​the lower surface of the heat exchange plate 34.

[0029] In the above embodiments, by limiting the contact area, the present invention significantly improves heat exchange efficiency and structural compactness. The vortex-shaped heat exchange tube 33 extends the flow path of the coolant within a limited space, allowing the coolant to flow sequentially through the outer ring of the densely packed heating element area and the relatively cooler inner ring, achieving stepwise heat exchange from the high-heat zone to the secondary heat zone. This avoids the local overheating problem caused by short flow channels and uneven flow rates in traditional straight or serpentine tubes. At the same time, the large-area contact between the heat exchange plate 34 and the heat exchange tube 33 ensures that the heat transfer path from the heating element to the heat exchange plate 34 to the heat exchange tube 33 and then to the coolant has extremely low thermal resistance, almost eliminating the heat transfer caused by contact gaps. Heat loss is minimized, and the contact area is no more than 9 / 10, leaving a necessary airflow channel between the heat exchange plate 34 and the bottom of the protective box 1. This allows the dry air to flow fully along the vortex path and exchange heat with the outer wall of the heat exchange tube 33, thereby further transferring some of the heat absorbed by the coolant to the flowing dry air, achieving a dual cooling effect of liquid cooling and air cooling. This design of the present invention fully considers the actual situation of the limited space in underground coal mines, maximizing the heat exchange area and rationalizing the airflow organization within a limited volume. It not only meets the strong heat dissipation requirements of the heating element, but also avoids excessive expansion of the device volume, reflecting a high degree of unity between structural compactness and thermal performance.

[0030] Further, refer to Figure 5 and Figure 6 The heat exchange tube 33 has a triangular structure with a flat upper part and a pointed lower part, or a semi-circular structure with a flat upper part.

[0031] In the above embodiments, the present invention specifies that the heat exchange tube 33 has a triangular cross-section with a flat upper part and a pointed lower part, and a semi-circular upper part in the second embodiment. The cross-sectional surface morphology of both embodiments optimizes the flow characteristics of the coolant and the structural strength of the heat exchange tube 33 while ensuring good contact with the heat exchange plate 34. The flat upper part allows the heat exchange tube 33 and the heat exchange plate 34 to form a surface contact rather than a line contact, effectively increasing the actual heat transfer area and avoiding the heat conduction bottleneck caused by the common "line contact" of circular tubes. The pointed or semi-circular lower part reduces the contact area between the heat exchange tube 33 and the inner wall of the bottom of the protective box 1, reducing the thermal bridge effect and preventing the bottom of the box from absorbing too much heat and dissipating it to the external environment. It also facilitates the... The space below the heat exchange tube 33 is released as a flow channel for dry air. In addition, this cross-sectional shape, which is flat at the top and pointed at the bottom, will generate local turbulence or eddies during the flow of coolant. In particular, the sharp corners can disrupt the laminar boundary layer and enhance the disturbance of the convection between the coolant and the tube wall, thereby improving the convective heat transfer coefficient inside the tube. Moreover, from a manufacturing process perspective, this cross-section can be formed by extrusion or bending, which is cost-effective and easy to adapt to the vortex disk layout. This design of the present invention improves the overall performance of the heat exchange tube 33 from two levels: microscopic heat transfer enhancement and macroscopic flow organization. This allows the coolant per unit volume to carry away more heat, thereby reducing the power consumption of the coolant circulation pump and the capacity requirement of the coolant tank. It is particularly suitable for high-efficiency heat dissipation applications in confined spaces in underground coal mines.

[0032] Further, refer to Figure 5 and Figure 6 The upper plane inside the heat exchange tube 33 has flow-blocking fins 331 extending longitudinally to improve the heat exchange effect.

[0033] In the above embodiments, the flow-restricting fins 331 are located inside the heat exchange tube 33 near the heat source side, i.e., the upper plane. When the coolant flows through the fins, the fins not only increase the contact area with the coolant, but more importantly, they induce secondary flow or vortices by changing the velocity and pressure distribution of the fluid. This disrupts the stable development of the thermal boundary layer, causing the low-temperature fluid in the core area of ​​the coolant to continuously mix with the high-temperature fluid near the tube wall, significantly improving the convective heat transfer coefficient. Numerical simulations and experiments show that, at the same Reynolds number, the Nusselt number of the heat exchange tube 33 with longitudinal flow-restricting fins 331 can be increased by 1.5 to 2.5 times, while the increase in resistance is relatively small. The overall thermal performance factor is significantly better than that of a bare tube. Since the fins are only set on the upper plane and do not extend to the lower sharp corner area, excessive increase in flow resistance is avoided, and the pressure drop at the inlet and outlet of the heat exchange tube 33 is kept within an acceptable range. This design of the present invention is designed for the characteristics of long-term continuous operation of underground coal mine detection equipment, ensuring that the coolant maintains a high heat exchange efficiency during the circulation process. Even if the coolant has a small amount of sediment or viscosity change due to long-term use, the local turbulence generated by the flow-blocking fins 331 can play a self-cleaning role, delaying the accumulation of dirt, thereby extending the coolant replacement cycle and the device maintenance interval, and reducing the frequency and safety risks of underground manual maintenance.

[0034] Further, refer to Figure 2 , Figure 5 and Figure 6 The lower surface of the heat exchange tube 33 is attached to the bottom inner wall of the protective box 1. A vortex-shaped channel cavity 5 is formed between the heat exchange tube 33, the heat exchange plate 34 and the protective box 1. The section of the heat exchange tube 33 near the outlet end extends downward, and the protective box 1 has a groove 11 corresponding to the section of the tube.

[0035] In the above embodiments, the lower surface of the heat exchange tube 33 is fitted against the bottom inner wall of the protective box 1, forming a vortex-shaped channel cavity 5 between the heat exchange tube 33, the heat exchange plate 34, and the protective box 1. Simultaneously, the section of the heat exchange tube 33 near the outlet end extends downwards, and a groove 11 is formed at the corresponding position in the protective box 1. This series of structures together constructs an efficient airflow guiding and drainage anti-accumulation system. Specifically, the heat exchange tube 33 can be detachably fixed to the protective box 1 or welded. Considering subsequent maintenance, a detachable connection is preferred. There are many common detachable methods, which will not be listed in this embodiment. First, the lower surface of the heat exchange tube 33 fitting against the bottom of the box serves a positioning and stabilizing function. To prevent displacement of the heat exchange tube 33 during underground transportation or vibration, and to reduce the gap between the heat exchange tube 33 and the housing, the dry air is forced to flow only along the preset vortex-shaped channel cavity 5, avoiding airflow short-circuiting. Secondly, the vortex-shaped channel cavity 5 causes the dry air to continuously change direction and speed during flow, increasing the contact time and contact area between the air and the outer wall of the heat exchange tube 33 and the inner wall of the housing. When the dry air flows through the channel, it can absorb some of the heat carried by the coolant through the tube wall, achieving pre-cooling treatment. When it enters the equipment area through the guide hole 341 in the middle of the heat exchange plate 34, the temperature has been significantly reduced, thus forming an additional "cold air cooling" effect on the detection equipment. Furthermore, the downward extension of the outlet end of the heat exchange tube 33, combined with the design of the settling tank 11, allows the coolant to flow more smoothly to the outlet pipe 32 under gravity, avoiding gas accumulation or flow dead zones. Simultaneously, if a small amount of condensate appears in the channel cavity 5 due to extremely high humidity underground, the settling tank 11 can collect the condensate and guide it to a lower point, preventing the condensate from soaking the heat exchange tube 33 or corroding the casing. This design improves the engineering reliability of the device from three dimensions: airflow organization, gravity drainage, and structural stability, making it particularly suitable for the harsh working conditions of inclined ground and frequent vibrations in underground coal mines.

[0036] Further, refer to Figure 4 The guide holes 341 are distributed in the middle of the heat exchange plate 34 so that the dry air can be fully cooled around the channel cavity 5 to dynamically replace the humid and hot gas in the protective box 1.

[0037] In the above embodiments, the present invention distributes the guide holes 341 in the middle of the heat exchange plate 34, so that the dry air can be fully cooled around the channel cavity 5 before passing upward through the heat exchange plate 34 and entering the equipment area. This airflow path design realizes a dynamic replacement mechanism from peripheral pre-cooling to centralized release, effectively solving the problem of local stagnation of humid and hot gas. After the dry air enters from the drying unit on one side of the bottom of the protective box 1, it is driven by the negative pressure of the suction fan 41. First, it is forced to flow a long distance and bend along the vortex-shaped channel cavity 5 formed by the heat exchange tube 33, the heat exchange plate 34 and the bottom of the protective box 1. During this process, it fully contacts the outer wall of the heat exchange tube 33, absorbs the cold energy of the tube wall and cools down, and at the same time, it exchanges heat with the inner wall of the box, carrying away some of the heat accumulated in the box itself. When the dry air flows to the middle of the heat exchange plate 34, its temperature and humidity have dropped to a low level. Then, it passes upward through the guide holes 341 and passes through the heat exchange plate 34, directly blowing on the heating element and circuit board area at the bottom of the detection equipment. The heat and moisture generated by the equipment are carried upwards and eventually discharged outside the chamber by the suction fan 41 at end cover 2. This path achieves a reasonable airflow organization where cold air converges from bottom to top and from the edge to the center, avoiding the short circulation phenomenon where dry air is directly drawn away as soon as it enters the chamber. This maximizes the heat and moisture carrying capacity of dry air per unit volume. At the same time, the guide hole 341 is only set in the central area instead of opening all the heat exchange plates 34, ensuring that the large-area contact heat transfer between the heat exchange plates 34 and the heat exchange tubes 33 is not damaged. This takes into account both heat transfer and ventilation needs, allowing cooling resources to be accurately distributed to high-heat areas and significantly improving the overall energy efficiency ratio of the protective device.

[0038] Furthermore, the coolant is an aqueous solution of ethylene glycol or an aqueous solution of propylene glycol.

[0039] In the above embodiments, the present invention selects ethylene glycol aqueous solution or propylene glycol aqueous solution as coolant. This selection fully considers the antifreeze, anti-corrosion, safety, and thermophysical property requirements of the coolant in the special environment of underground coal mines. The freezing point of ethylene glycol and propylene glycol aqueous solutions can be adjusted with concentration. Within the volume concentration range of 30% to 50%, the freezing point can be as low as -30°C to -15°C, which is fully capable of adapting to the low temperatures that may occur in underground coal mines during winter or in high-altitude mines. This prevents the coolant from freezing and cracking the heat exchange tube 33 or clogging the circulation pump. Compared with pure water, ethylene glycol / propylene glycol solutions have a lower freezing point. The liquid has low corrosivity to metal materials such as copper, aluminum, and stainless steel. With the addition of appropriate corrosion inhibitors, it can operate stably for a long time without frequent replacement of the coolant, reducing the complexity and safety risks of downhole maintenance. In terms of safety, propylene glycol is a food-grade additive that is non-toxic and has low volatility. Even if a small leak occurs, it will not cause health hazards to downhole operators. Moreover, the heat exchange tube 33 of this invention is preferably made of copper, while the inlet pipe 31, outlet pipe 32, and cooling box 8 pipes exposed outside the protective box 1 are made of materials with poor heat exchange effect and thicker walls.

[0040] While ethylene glycol has some toxicity, its volatility is extremely low, resulting in limited leakage in closed-loop systems. Furthermore, a bittering agent can be added for warning purposes. From a thermophysical perspective, although the specific heat capacity and thermal conductivity of the ethylene glycol / propylene glycol solution are slightly lower than those of pure water, its viscosity increase at low temperatures is moderate. Combined with the enhanced heat transfer design of the internal flow-blocking fins 331 and the vortex-shaped flow channel in the aforementioned heat exchange tube 33, it fully meets the heat dissipation requirements of the detection equipment. More importantly, these two coolants have good compatibility with common sealing materials (EPDM, fluororubber, etc.), and long-term operation is unlikely to cause swelling or hardening of the seals, thereby reducing the risk of leakage in the underground water-cooling system. The coolant selection in this invention is not a simple material replacement, but a comprehensive optimization decision based on the special working conditions of underground coal mines, providing a material basis for the long-term reliable operation of the entire thermal management system.

[0041] Further, refer to Figure 1 and Figure 7 The support unit includes multiple detachable legs 6, which are respectively located at each corner of the protective box 1. The lower end of the legs 6 is a conical structure that can be extended into the soil. The lower part of the protective box 1 is provided with N magnetic blocks corresponding to each leg 6, and the legs 6 are also provided with S magnetic blocks corresponding to the magnetic blocks.

[0042] In the above embodiments, the present invention sets the support unit as multiple detachable legs 6, and the lower end of the legs 6 is a conical structure that can be extended into the soil. This design fully adapts to the complex ground conditions in coal mines, such as coal slurry, gravel, and uneven rock strata, and achieves rapid and stable fixing of the protective box 1. When traditional protective devices are placed directly on the underground ground, the box often tilts or slides due to uneven ground or the presence of coal slurry, affecting the levelness and measurement accuracy of the detection equipment. However, by using independent detachable legs 6, operators can choose whether to install the legs 6 and adjust the insertion depth of the legs 6 according to the actual situation. The conical structure can easily penetrate into soft coal slurry or soil, and provides anti-slip and anti-overturning capabilities through the friction between the conical surface and the soil and the lateral earth pressure. Even if there is slight vibration in the roadway or vibration caused by personnel walking, the protective box 1 can remain in place. At the same time, the detachability of the legs 6 makes installation easier. When transporting and relocating, the outriggers 6 can be removed to reduce packaging volume and facilitate handling in narrow underground tunnels. When the equipment needs to work on hard, flat rock surfaces, the outriggers 6 can be omitted, and the bottom of the protective box 1 can be used for placement. This design not only solves the fixing problem functionally but also reduces the labor intensity of operators from an ergonomic perspective, allowing for installation and disassembly by hand. In addition, the connection between the outriggers 6 and the protective box 1 can be designed as a quick-connect or threaded connection, but a magnetic structure is preferred, which can achieve disassembly and assembly in seconds, greatly improving the efficiency and convenience of underground coal mine operations.

[0043] Further, refer to Figure 3 The coolant circulation unit includes a delivery pump 7, a cooling tank 8 for holding coolant, and a radiator fan 9 for physically cooling the cooling tank 8.

[0044] In the above embodiments, the coolant circulation unit of the present invention is specifically defined as a delivery pump 7, a cooling tank 8 containing coolant, and a cooling fan 9 for physically cooling the cooling tank 8. This configuration constitutes a complete, closed-loop thermal management system with secondary heat dissipation capability. The delivery pump 7 provides circulation power for the coolant between the heat exchange tube 33 and the cooling tank 8. Its flow rate and head can be selected and matched according to the heat generation power of the detection equipment to ensure that the coolant can maintain a sufficient flow rate in the vortex-shaped long flow channel. The cooling tank 8, as a heat buffer container, collects the high-temperature coolant flowing back from the protective box 1 and discharges the heat to the surrounding mine air through natural convection or forced air cooling by the cooling fan 9, realizing the final heat dissipation. The presence of the cooling fan 9 significantly improves the heat dissipation efficiency of the cooling box 8, especially in the hot and humid underground environment where natural convection cooling is extremely ineffective. Forced air cooling becomes an essential supplementary method. This design enables the entire thermal management system to have two-stage heat exchange: the first stage is where the coolant in the heat exchange tube 33 inside the protective box 1 absorbs the heat from the equipment; the second stage is where the cooling fan 9 at the cooling box 8 transfers the heat carried by the coolant to the mine atmosphere. The two-stage heat exchange separates the heat absorption and heat dissipation functions, allowing the protective box 1 to be relatively sealed, avoiding the direct introduction of dirty mine air. The cooling box 8 can be flexibly arranged in a location with good airflow according to the underground ventilation conditions, and can even be installed on the side wall of the roadway or introduce compressed air through air ducts. In addition, the volume of the cooling box 8 can be designed as needed to act as a cold storage device. When the short-term heat load peak exceeds the capacity of the cooling fan 9, the coolant in the cooling box 8 can temporarily store heat, and then slowly dissipate it after the peak, thereby smoothing the impact of heat load fluctuations on the equipment temperature. This structure is simple, cost-controllable, and easy to maintain. Together with the aforementioned heat exchange tubes 33, heat exchange plates 34, and other components, it constitutes an efficient, reliable, and adaptable overall thermal management solution for the harsh environment of underground coal mines.

[0045] Usage and Working Principle: After the coolant enters the inlet pipe 31, it preferentially flows around the outer ring of the vortex-shaped heat exchange tube 33. It first efficiently dissipates heat from the heat dissipation elements around the bottom of the transient electromagnetic advanced detection device. Because the vortex-shaped heat exchange tube 33 has a wider contact area with the heat exchange plate 34, its heat dissipation conditions are better. The purpose of the heat exchange plate 34 is physical contact heat exchange, and its bottom, together with the protective box 1, can block and change the path of dry air entering from the side. As the bottom of the heat exchange plate 34 tube is tightly attached to the box, it ensures that dry air entering will inevitably enter... In the blocked vortex channel cavity 5, as dry air is drawn in under negative pressure and flows along the vortex path, it is fully cooled. The cooled air then passes through the guide hole 341 in the middle of the heat exchange plate 34, thus displacing the humid and hot air inside the protective box 1. This not only achieves efficient heat exchange of the heat dissipation element, but also removes the humid and hot air inside the protective box 1 and fully cools the incoming dry air. Ultimately, the air inside the box is kept at a low temperature, thereby further achieving a comprehensive cooling effect on the detection equipment.

[0046] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A protective device for transient electromagnetic advance detection equipment in coal mines, characterized in that, include: The protective box has an opening at the top and is equipped with a detachable end cap. The lower end of the protective box is connected to a support unit. The cooling assembly includes an inlet pipe, an outlet pipe, a heat exchange pipe, heat exchange plates, and a coolant circulation unit. The inlet pipe and the heat exchange pipe are respectively inserted through two opposite side walls of the protective box. The heat exchange pipe includes an inlet end and an outlet end. The inlet end is connected to the inlet pipe, and the outlet end is connected to the outlet pipe. The top of the heat exchange pipe is flat and its extension path passes directly below the heating element of the detection device. The heat exchange plates are placed above the heat exchange pipe to transfer heat from the heating element of the detection device to the heat exchange pipe. The coolant circulation unit is connected to the inlet of the inlet pipe and the outlet of the outlet pipe to transport the cooled coolant and recover the high-heat coolant from the heat exchange. The dehumidification assembly includes a suction fan installed on the end cover of the protective box and a drying unit installed on one side of the bottom of the protective box. The drying unit includes a box body and a desiccant placed inside the box body. As the suction fan draws in, the moisture inside the protective box is extracted, and dry air is continuously delivered under negative pressure. The heat exchange plate has multiple guide holes for allowing dry air to pass through the heat exchange plate.

2. The protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 1, characterized in that, The heat exchange tube is vortex-shaped, and the area of ​​the lower surface of the heat exchange plate that is in contact with the heat exchange tube accounts for 4 / 5 to 9 / 10 of the area of ​​the lower surface of the heat exchange plate.

3. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 2, characterized in that, The heat exchange tube has a triangular structure with a flat upper part and a pointed lower part, or a semi-circular structure with a flat upper part.

4. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 3, characterized in that, The upper plane inside the heat exchange tube has multiple flow-restricting fins extending longitudinally to improve the heat exchange effect.

5. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 3, characterized in that, The lower surface of the heat exchange tube is in contact with the bottom inner wall of the protective box, and a vortex-shaped channel cavity is formed between the heat exchange tube, the heat exchange plate and the protective box. The section of the heat exchange tube near the outlet end extends downward, and the protective box has a groove corresponding to the section of the tube.

6. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 5, characterized in that, The guide holes are distributed in the middle of the heat exchange plates so that the dry air can be fully cooled around the channel cavity to dynamically replace the humid and hot gas in the protective box.

7. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 1, characterized in that, The coolant is an aqueous solution of ethylene glycol or an aqueous solution of propylene glycol.

8. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 1, characterized in that, The support unit includes multiple detachable legs, which are respectively located at each corner of the protective box. The lower end of each leg is a conical structure that can extend into the soil.

9. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 8, characterized in that, The lower part of the protective box is provided with N magnetic blocks corresponding to each leg, and the legs are also provided with S magnetic blocks corresponding to the magnetic blocks.

10. A protective device for transient electromagnetic advance detection equipment in coal mines as described in claim 1, characterized in that, The coolant circulation unit includes a delivery pump, a cooling tank for holding coolant, and a cooling fan for physically cooling the cooling tank.

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