PCB key board for mining explosion-proof frequency converter

Abstract

The utility model discloses a mining explosion-proof frequency converter used PCB button board, comprising a board body, the board body is internally provided with a heat radiation channel, the heat radiation channel is in a net structure, the heat radiation channel is specifically composed of a vertical channel and a transverse channel, the cross section of the vertical channel and the cross section of the transverse channel are circular, the inner wall of the heat radiation channel is provided with a heat conduction coating, and the heat conduction coating is coated on the inner wall of the heat radiation channel. The heat conduction coating is of a honeycomb structure. According to the utility model, through the unique net-shaped heat dissipation channel structure and the channel layout design based on the thermosyphon principle, and the combination of the honeycomb structure heat conduction coating with high heat conductivity, the rapid evacuation and directional transmission of heat can be realized, the temperature of a heating element on the PCB key board can be effectively reduced, the local overheating phenomenon can be avoided, and the service life of the PCB key board can be prolonged. And the equipment can still work stably in a mining environment with long-time continuous operation, and the reliability and the service life of the equipment are greatly improved and prolonged.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for electronic devices, and in particular to a PCB keypad for a mining explosion-proof frequency converter. Background Technology

[0002] In mining operations, safety is undoubtedly the core concern, as even the slightest safety hazard can lead to catastrophic consequences. Explosion-proof frequency converters for mining, as key electrical equipment ensuring the stable operation of mine power systems, bear the heavy responsibility of providing precise control commands via their PCB keypads. They must be able to maintain continuous and stable operation under extremely complex and harsh working conditions.

[0003] A thorough analysis of its internal structure reveals a lack of scientific and effective optimization in heat conduction path design. To meet the complex functional requirements of circuits, the internal wiring of PCB boards is often extremely intricate. When heat-generating components produce heat, the heat encounters physical obstacles formed by the crisscrossing wiring and the thermal barriers of the insulating layers during its dissipation, forcing a lengthened heat transfer path and a sharp increase in thermal resistance. As a result, heat cannot be efficiently channeled and is instead scattered haphazardly throughout the PCB, inevitably exacerbating localized overheating. This severe deficiency in heat dissipation directly triggers a series of negative chain reactions. Most notably, it accelerates the aging process of electronic components, affecting the reliability and stability of the entire mining explosion-proof frequency converter and even the entire mine power system. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a PCB keypad for a mining explosion-proof frequency converter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A PCB keypad for a mining explosion-proof frequency converter includes a board body with a heat dissipation channel inside. The heat dissipation channel has a mesh structure and is specifically composed of vertical and horizontal channels. The cross-sectional shape of the vertical and horizontal channels is circular. The inner wall of the heat dissipation channel is provided with a thermally conductive coating, which has a honeycomb structure.

[0007] Preferably, the diameter of the vertical and horizontal channels is 0.5 mm, the outlets of the vertical and horizontal channels near the edge of the plate are relatively high, and the inlets of the vertical and horizontal channels near the heating element are relatively low.

[0008] Preferably, the vertical channel and the horizontal channel have an inclination angle from the entrance to the exit, and the inclination angle from the entrance to the exit of the vertical channel and the horizontal channel is 10°.

[0009] Preferably, the thermally conductive coating is deposited on the inner wall of the heat dissipation channel using atomic layer deposition technology, and the thermally conductive coating layer is composed of carbon nanotubes, alumina nanoparticles, boron nitride nanoparticles, silver nanoparticles and copper nanoparticles.

[0010] Preferably, the thickness of the thermally conductive coating is 200 nm, and the total mass percentage of the silver nanoparticles and copper nanoparticles in the thermally conductive coating is 50%.

[0011] Preferably, the thermally conductive coating also contains trace elements of zinc and chromium, wherein the mass percentage of zinc and chromium is 3%.

[0012] The beneficial effects of this utility model are:

[0013] 1. Through a unique mesh heat dissipation channel structure and a channel layout design based on the thermosiphon principle, combined with a honeycomb structure thermal conductive coating with high thermal conductivity, it can achieve rapid heat dissipation and directional transfer, effectively reduce the temperature of heat-generating components on the PCB keypad, avoid local overheating, and ensure that the equipment can still work stably in mining environments where it operates continuously for a long time, greatly improving the reliability and service life of the equipment.

[0014] 2. The addition of zinc and chromium trace elements to the thermally conductive coating gives it excellent corrosion resistance, enabling it to resist the erosion of corrosive gases commonly found in mining environments (such as hydrogen sulfide), ensuring the integrity and long-term effectiveness of the thermally conductive coating and the entire heat dissipation structure, reducing the risk of heat dissipation performance degradation and equipment failure due to corrosion, and further improving the equipment's adaptability to harsh working conditions.

[0015] 3. The circular cross-section of the heat dissipation channel, the reasonable size setting, and the design of being tightly integrated with the thermally conductive coating ensure that the entire heat dissipation structure can maintain good structural integrity when subjected to factors such as vibration and temperature changes in the mining environment. The components work together and there will be no problems such as structural loosening or coating peeling that affect the heat dissipation effect, providing strong structural support for the stable operation of the equipment.

[0016] 4. Effective heat dissipation measures help maintain the normal operating temperature of the PCB keypad, avoiding electrical faults caused by overheating. This reduces the possibility of explosions and other safety accidents in mining environments where there are dangerous factors such as flammable and explosive gases, thus ensuring the safety of mine operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front structure of the plate.

[0018] Figure 2 This is a schematic diagram of the back structure of the plate.

[0019] Figure 3 This is a schematic diagram of the heat dissipation channel inside the board.

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the thermally conductive coating.

[0021] In the diagram: 1. Board body, 2. Heat dissipation channel, 3. Thermal conductive coating. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-4 A PCB keypad board for an explosion-proof frequency converter in mining applications is disclosed, the core component of which includes a board body 1. The board body 1 serves as the basic load-bearing structure for the entire keypad board, and its interior is meticulously designed with heat dissipation channels 2 to address the heat dissipation problem caused by the long-term operation of the PCB keypad board in the special and harsh working environment of explosion-proof mining applications. The heat dissipation channels 2 exhibit a unique mesh structure, formed by the interweaving of vertical and horizontal channels, resembling a dense network throughout the interior of the board body 1. Notably, the cross-sectional shape of both the vertical and horizontal channels is designed to be circular. A circular cross-sectional shape offers numerous advantages, such as reducing airflow resistance compared to other shapes, facilitating smoother heat transfer, and making high-precision molding processes easier to achieve during manufacturing, ensuring the consistency and stability of each channel.

[0024] Further refinement was achieved by precisely setting the diameters of the vertical and horizontal channels to 0.5mm. This dimension was determined after extensive simulation experiments and actual testing, ensuring sufficient airflow space for effective heat dissipation without excessively occupying the limited internal space of board 1, thus avoiding interference with the layout of other electronic components and circuitry. Simultaneously, considering the directionality and efficiency of heat transfer, the outlets of the vertical and horizontal channels near the edges of board 1 are relatively high, while the inlets near the heat-generating elements are relatively low. This design cleverly utilizes the thermosiphon principle, allowing the heat generated by the heating elements to induce natural convection within the channels. Hot air naturally flows from the higher-temperature inlet (near the heat-generating element) to the lower-temperature outlet (near the edge of board 1), thereby achieving directional heat transfer from the heat source to the external environment.

[0025] To further enhance the flow of hot air, the inlet and outlet of both the vertical and horizontal channels have a specific inclination angle, set at 10°. This angle was chosen after comprehensively considering aerodynamic principles and actual heat dissipation requirements. At this angle, after the hot air expands due to heat, it can flow more smoothly and efficiently within the channel, avoiding air stagnation or backflow, maximizing the speed of heat dissipation, and ensuring the stability and continuity of the entire heat dissipation process.

[0026] The inner wall of the heat dissipation channel 2 is coated with a thermally conductive coating 3, which exhibits a honeycomb structure. This honeycomb structure is composed of multiple tightly arranged hexagonal units, possessing a large specific surface area. This increases the contact area with air and the inner wall of the heat dissipation channel 2, providing more favorable conditions for rapid heat conduction. The thermally conductive coating 3 is deposited on the inner wall of the heat dissipation channel 2 using advanced atomic layer deposition (ALD) technology. ALD is a process that enables high-precision and uniform deposition at the nanoscale. Specifically, during the deposition process, by precisely controlling parameters such as reaction conditions and the order and timing of precursor gas introduction, the coating can grow uniformly layer by layer on the inner wall of the heat dissipation channel 2, forming a tight bond with the inner wall and preventing peeling or detachment, thus ensuring the long-term effectiveness of the thermally conductive coating 3.

[0027] From a compositional perspective, the thermally conductive coating 3 is composed of a variety of high-performance materials, including carbon nanotubes, alumina nanoparticles, boron nitride nanoparticles, silver nanoparticles, and copper nanoparticles. Carbon nanotubes possess extremely high thermal conductivity, enabling them to build efficient heat conduction "bridges" within the coating, allowing for rapid heat transfer. Alumina and boron nitride nanoparticles exhibit good chemical stability and high-temperature resistance, stabilizing the coating structure and ensuring its integrity and thermal conductivity remain even under conditions of high temperatures and complex chemical substances encountered in mining environments. Silver and copper nanoparticles, with their excellent thermal conductivity, interconnect to form a network providing the main heat conduction pathways. Their combined mass proportion in the thermally conductive coating 3 is 50%, an optimized ratio that ensures sufficient thermal conductivity while also synergizing with other components, resulting in optimal thermal conductivity for the entire coating.

[0028] Furthermore, considering factors such as corrosive gases present in the mining environment, zinc and chromium trace elements, accounting for 3% by mass, were specially added to the coating to enhance its corrosion resistance and extend its service life. These trace elements can interact with other components to form a protective microstructure on the coating surface, effectively resisting the erosion of external corrosive substances and ensuring that the thermally conductive coating 3 maintains good thermal conductivity during long-term use.

[0029] The thickness of the thermally conductive coating 3 was set at 200 nm, a nanometer-scale thickness determined through repeated trade-offs and testing. An excessively thick coating might increase costs and, to some extent, affect heat transfer efficiency because heat needs to travel a longer conduction path; while an excessively thin coating might not provide sufficient thermal conductivity or corrosion protection. The 200 nm thickness effectively leverages the synergistic thermal conductivity of the components while meeting the durability requirements of the coating in mining environments, achieving relatively ideal cost control.

[0030] During operation of the explosion-proof frequency converter for mining, electronic components such as chips and power transistors on the plate 1 generate heat, which is transferred to the periphery of the heat dissipation channel 2. Since the inlet of the heat dissipation channel 2 near the heat source is lower, the air density inside the channel decreases after heating, and according to the thermosiphon principle, hot air naturally flows into the channel. In the interwoven mesh structure of vertical and horizontal channels, the hot air flows along the 10° inclined channel from the inlet near the heat-generating element to the outlet near the edge of the plate 1, achieving stable natural convection.

[0031] Meanwhile, the thermally conductive coating 3 on the inner wall of the heat dissipation channel 2 is crucial. When hot air flows through the channel, heat is first transferred to the thermally conductive coating 3. With the help of the efficient heat conduction path constructed by carbon nanotubes and the main heat conduction network composed of silver and copper nanoparticles, the heat diffuses rapidly within the coating. Alumina and boron nitride nanoparticles ensure the structural stability of the coating at high temperatures, while trace elements of zinc and chromium enhance its corrosion resistance, ensuring continuous and stable heat conduction.

[0032] Ultimately, heat is transferred to the air inside the channel through the thermally conductive coating 3 and then expelled to the outside with the hot air, achieving efficient heat dissipation and keeping the PCB button board at a suitable temperature during long-term operation, thus avoiding performance and safety issues caused by overheating.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A PCB key board for mine-used explosion-proof frequency converter, comprising a plate body (1), characterized in that, The plate body (1) is internally provided with a heat dissipation channel (2), the heat dissipation channel (2) is in a net structure, the heat dissipation channel (2) is specifically composed of vertical channels and horizontal channels, the cross-sectional shape of the vertical channels and the horizontal channels is circular, and the inner wall of the heat dissipation channel (2) is provided with a heat conduction coating (3), and the heat conduction coating (3) is in a honeycomb structure.

2. The PCB key board for mine-used explosion-proof frequency converter according to claim 1, characterized in that, The diameter of the vertical channels and the horizontal channels is 0.5 mm, the outlet of the vertical channels and the horizontal channels near the edge of the plate body (1) is relatively high, and the inlet of the vertical channels and the horizontal channels near the heating element is relatively low.

3. The PCB key pad for mine-used explosion-proof frequency converter according to claim 2, characterized in that, The inlet to the outlet of the vertical channels and the horizontal channels has an inclination angle, and the inclination angle of the inlet to the outlet of the vertical channels and the horizontal channels is 10°.

4. The PCB key pad for mine-used explosion-proof frequency converter according to claim 3, characterized in that, The heat conduction coating (3) is arranged on the inner wall of the heat dissipation channel (2) by an atomic layer deposition technology.

5. The PCB key pad for mine-used explosion-proof frequency converter according to claim 4, characterized in that, The thickness of the heat conduction coating (3) is 200 nm.

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