Explosion-proof heat dissipation shell of mining charger

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a mining charger explosion-proof heat dissipation shell, which comprises a hexahedral shell, an openable and closable door body arranged in front of the shell, a wiring cavity arranged at the top of the shell, a base arranged at the bottom of the shell, and an electrical function component arranged in the shell. An inner heat dissipation plate is fixed to the inner side of a rear plate of the shell, an outer heat conduction plate is fixed to the corresponding position of the outer side of the rear plate of the shell, the outer heat conduction plate and the inner heat dissipation plate are in rigid connection through a fixing hole penetrating through the rear plate, the outer heat conduction plate is covered with a heat dissipation shell, one side face of the heat dissipation shell is provided with an air inlet opening, and the opposite side face of the heat dissipation shell is provided with air outlet ventilation holes. And a first cooling fan is fixed at the air inlet opening. Two rows of reinforcing beams arranged in parallel are arranged in the shell in the longitudinal direction, the two ends of each reinforcing beam are fixedly connected with an upper plate and a lower plate of the shell respectively, and an inner cavity of the shell is divided into a first area, a second area and a third area from top to bottom.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to an explosion-proof heat dissipation housing for a mining charger. Background Technology

[0002] Currently, mining lithium battery chargers are key equipment in underground coal mine power systems, and their safety and reliability are directly related to the safety of workers and the continuity of production. In terms of explosion-proof design, the industry generally adopts an explosion-proof enclosure structure. This is based on GB 3836.2—2021 "Electrical Apparatus for Explosive Atmospheres – Part 2: Explosion-proof Enclosures 'd'", which encapsulates the charger's main circuit and control unit within a metal casing with sufficient mechanical strength and strict explosion-proof joint parameters (e.g., joint width ≥ 12.5 mm, gap ≤ 0.15 mm). The casing withstands the potential explosion pressure of flammable gases inside and prevents the flame from spreading outward, thus achieving intrinsic safety protection. In terms of heat dissipation design, due to the rigid constraints of the explosion-proof structure on the airtightness of the shell and the integrity of the joint surface, existing products mostly adopt a single-path heat dissipation solution: common methods include adding a finned heat sink to the outside of the rear plate of the shell and equipping it with a single axial fan for forced air cooling, or arranging a small number of general-purpose cooling fans in the inner cavity of the shell, supplemented by air guide plates to guide airflow; some high-end models have also tried to attach thermal pads to the surface of high-heat components such as transformers and inductors and extend them to the shell wall, but the overall design is still guided by "whole machine temperature management" and does not make differentiated layouts for the heat load characteristics of different functional areas.

[0003] However, the aforementioned technical solutions have revealed significant limitations in actual downhole operations: The lithium battery charging process involves high-power rectification, inversion, and energy conversion, leading to concentrated heat generation in components such as inductors, three-phase isolation transformers, large-capacity electrolytic capacitor banks, and drive modules. Furthermore, the heat density of each component varies significantly—for example, the steady-state temperature rise of a three-phase isolation transformer can reach over 75°C, while control transformers and signal capacitors are even more temperature-sensitive, requiring long-term operating temperatures to be controlled below 65°C. Existing heat dissipation structures cannot implement graded responses based on heat source distribution, resulting in high temperatures. Heat is continuously conducted from the high-temperature zone to the medium-low temperature zone, causing a combined effect of localized overheating and overall temperature rise. Simultaneously, single-point air intake or disordered multi-fan placement leads to turbulent airflow, resulting in low heat exchange efficiency at key heat source surfaces. Actual measurements show that the capacitor bank casing temperature often exceeds the limit by 10–15°C during full-load operation, accelerating electrolyte evaporation and dielectric aging, severely restricting equipment lifespan and operational stability. Furthermore, if the front door structure designed to meet operational requirements is not coordinated with the cooling system, frequent opening and closing can easily compromise the explosion-proof integrity, or the door itself can act as a thermal bridge, exacerbating internal heat accumulation. These problems collectively constitute the technical bottleneck currently facing mine explosion-proof chargers, making it difficult to balance safety, heat dissipation efficiency, and long-term reliability. Utility Model Content

[0004] This utility model discloses an explosion-proof heat dissipation shell for a mining charger, which mainly solves the technical bottleneck of traditional mining explosion-proof chargers in that it is difficult to balance safety, heat dissipation efficiency and long-term reliability.

[0005] To achieve the aforementioned objective, this utility model provides an explosion-proof heat dissipation housing for a mining charger, comprising a hexahedral housing, an openable door located at the front of the housing, a wiring cavity located at the top of the housing, a base located at the bottom of the housing, and electrical functional components built into the housing.

[0006] An inner heat dissipation plate is fixed to the inner side of the rear plate of the housing, and an outer heat conduction plate is fixed to the corresponding position on the outer side. The outer heat conduction plate and the inner heat dissipation plate are rigidly connected through a fixing hole penetrating the rear plate. The outer heat conduction plate is covered with a heat dissipation shell. One side of the heat dissipation shell is provided with an air inlet opening, and the opposite side is provided with an air outlet vent. A first cooling fan is fixed at the air inlet opening. Two rows of parallel reinforcing beams are arranged longitudinally inside the housing. The two ends of the reinforcing beams are fixedly connected to the upper plate and the lower plate of the housing, respectively, dividing the inner cavity of the housing into a first region, a second region, and a third region from top to bottom.

[0007] Preferably, the first region is located on the upper part of the housing, and a Z-shaped heat dissipation bracket is fixedly connected to the inner side of the rear plate of the housing in the first region. Five fourth heat dissipation fans are arranged in an array on its side wall. A capacitor plate is fixed at the top of the Z-shaped heat dissipation bracket and an organic core assembly is fixed at the bottom.

[0008] Preferably, the second region is located in the middle of the housing, and there is an embedded heat dissipation module spanning between two reinforcing beams. The embedded heat dissipation module includes a housing, multiple parallel heat dissipation fins disposed in the housing, and two third heat dissipation fans disposed on one side of the heat dissipation fins and whose air ducts match the gaps between adjacent fins.

[0009] Preferably, the third region is located at the lower part of the shell and has an arched heat dissipation bracket inside. The arched heat dissipation bracket covers the top space of the third region and has six second heat dissipation fans fixed at intervals on its top surface. A heat baffle is provided between the second region and the third region, and the heat baffle is sealed to the inner wall of the shell around its perimeter.

[0010] Preferably, the door includes an upward-opening door and a downward-opening door hinged to the front side of the housing. A control panel is fixed to the outer surface of the upward-opening door. The control panel is equipped with a power button, a power off button, a start button, a stop button, a reset button, and a display screen located above the buttons.

[0011] Preferably, the housing is further provided with an isolation phase-changing switch, and a transmission rod is fixed on one side of the isolation phase-changing switch. The transmission rod passes through the front side wall of the housing and extends to the outside of the housing, and an isolation switch rocker is fixedly connected to its outer end.

[0012] Preferably, the reinforcing beam is fixedly connected to the upper and lower plates of the shell by full welding.

[0013] Preferably, the outer heat-conducting plate has a multi-layer plate structure, with multiple copper pipes running through its interior. The copper pipes are fitted to the surface of the inner heat-dissipating plate and form a fixed connection. The outer heat-conducting plate is connected to the inner heat-dissipating plate through the copper pipes.

[0014] Preferably, the embedded heat dissipation module has 20 to 40 heat dissipation fins, a height of 15 mm to 25 mm, and a spacing of 4 mm to 6 mm between adjacent fins.

[0015] The technical solution provided by this utility model has at least the following technical effects:

[0016] This application scientifically divides the internal cavity into three distinct zones—a first zone (control zone), a second zone (power conversion zone), and a third zone (main energy conversion zone)—with different heat load characteristics by setting two rows of longitudinal reinforcing beams inside the explosion-proof housing. Based on this, a differentiated, structured, and directional multi-path heat dissipation system is configured, fundamentally solving the long-standing problems of "extensive heat dissipation, overlapping heat zones, and overheating of key components" in mining chargers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0020] Figure 3 This is a rear view of an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the structure of this utility model without the heat sink shell;

[0022] Figure 5 This is a schematic diagram of the internal structure from another angle of an embodiment of the present invention;

[0023] Figure 6 This is a partially enlarged schematic diagram of the outer heat-conducting plate and the inner heat-dissipating plate in an embodiment of this utility model;

[0024] Key reference numerals in the attached drawings: 10, housing; 101, first region; 1011, U-shaped heat sink bracket; 1012, fourth cooling fan; 102, second region; 1021, embedded heat sink module; 103, third region; 1031, second fan; 11, door; 12, heat sink shell; 13, wiring cavity; 14, disconnect switch lever; 15, first cooling fan; 121, outer heat conduction plate; 122, inner heat sink plate; Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model 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 utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Please refer to Figures 1-6This utility model provides an explosion-proof heat dissipation housing for a mining charger, including a hexahedral housing 10, an openable door 11 located at the front of the housing 10, a wiring cavity 13 located at the top of the housing 10, a base located at the bottom of the housing 10, and electrical functional components built into the housing 10; the housing 10 has two rows of parallel reinforcing beams arranged longitudinally inside, and the two ends of the reinforcing beams are fixedly connected to the upper plate and the lower plate of the housing 10 respectively, dividing the inner cavity of the housing 10 into a first region 101, a second region 102, and a third region 103 from top to bottom; the first region 101 is located at the upper part of the housing 10, and the first... Region 101 is equipped with a Z-shaped heat dissipation bracket 1011 fixedly connected to the inner side of the rear plate of the housing 10. Five fourth cooling fans 1012 arranged in an array are provided on its side. A capacitor plate is fixed to the top of the Z-shaped heat dissipation bracket 1011, and a core assembly is fixed to the bottom. The second region 102 is located in the middle of the housing 10 and contains an embedded heat dissipation module 1021 spanning between two reinforcing beams. The embedded heat dissipation module 1021 includes a housing, multiple parallel heat dissipation fins disposed within the housing, and two third cooling fans disposed on one side of the heat dissipation fins with airflow matching the gap between adjacent fins. The third region... Domain 103 is located at the lower part of the housing 10, and an arched heat dissipation bracket is provided inside it. The arched heat dissipation bracket covers the top space of the third region 103, and six second heat dissipation fans are fixed at intervals on its top surface. An inner heat dissipation plate 122 is fixed on the inner side of the rear plate of the housing 10, and an outer heat conduction plate 121 is fixed at a corresponding position on the outer side. The outer heat conduction plate 121 and the inner heat dissipation plate 122 are rigidly connected through a fixing hole penetrating the rear plate. The outer heat conduction plate 121 is covered with a heat dissipation shell 12. One side of the heat dissipation shell 12 has an air inlet opening, and the opposite side has an air outlet vent. A first heat dissipation fan 15 is fixed at the air inlet opening; the second region A heat shield is provided between area 102 and the third area 103, and the heat shield is sealed to the inner wall of the housing 10 around its perimeter; the door 11 includes an upper door and a lower door hinged to the front side of the housing 10, and a control panel is fixed to the outer surface of the upper door. The control panel is provided with a power button, a power off button, a start button, a stop button, a reset button, and a display screen located above the buttons; an isolation phase-changing switch is also provided inside the housing 10, and a transmission rod is fixed to one side of the isolation phase-changing switch. The transmission rod passes through the front side wall of the housing 10 and extends to the outside of the housing 10, and its outer end is fixedly connected to an isolation switch rocker 14.

[0029] In this embodiment, the reinforcing beam is fixedly connected to the upper and lower plates of the housing 10 by full welding. The explosion-proof joint surface between the top-opening door and the housing 10 is 12.5 mm wide, and the joint surface gap is 0.10 mm. The heat baffle is a stainless steel plate with a thickness of 2 mm, and its four edges are sealed to the inner wall of the housing 10 by full welding.

[0030] In this embodiment, the external heat-conducting plate 121 has a multi-layer plate structure, and multiple copper pipes are installed inside the external heat-conducting plate 121. The copper pipes cooperate with the surface of the inner heat dissipation plate 122 and form a fixed connection. The external heat-conducting plate 121 is connected to the inner heat dissipation plate 122 through the copper pipes.

[0031] The arched heat dissipation bracket is made of bent sheet metal, and its surface is covered with an anodized anti-corrosion layer.

[0032] In this embodiment, the embedded heat dissipation module 1021 has 20 heat dissipation fins, each 15 mm high, with a spacing of 4 mm between adjacent fins. This parameter setting ensures heat dissipation efficiency while reducing the overall size of the heat dissipation module, facilitating embedded installation.

[0033] In another embodiment of this utility model, the embedded heat dissipation module 1021 has 40 heat dissipation fins, a height of 25 mm, and a spacing of 6 mm between adjacent fins. This parameter setting increases the heat dissipation area and improves the heat dissipation performance of the heat dissipation module.

[0034] This application scientifically divides the internal cavity into a first region 101 (control zone), a second region 102 (power conversion zone), and a third region 103 (main energy conversion zone) with distinct heat load characteristics by setting two rows of longitudinal reinforcing beams inside the explosion-proof housing 10. Based on this, a differentiated, structured, and directional multi-path heat dissipation system is configured, fundamentally solving the long-standing problems of "extensive heat dissipation, superimposed heat zones, and overheating of key components" in mining chargers.

[0035] Specifically: the arched heat sink bracket, in conjunction with six second cooling fans, provides top-coverage direct cooling to the three-phase isolation transformer and inductor in the third area 103, increasing the surface heat exchange efficiency of high-heat-density components by 2.1 times; the embedded fin heat sink module, spanning between the reinforcing beams, significantly enhances the deep heat exchange capability of the large capacitor bank and driver board in the second area 102 with its precisely matched fan airflow and high-density fin structure, achieving a measured temperature drop of 21.7℃ for the IGBT module; the Z-shaped heat sink bracket 1011 forms a low thermal resistance conduction chain with the rear heat conduction plate, and works in conjunction with the five-point distributed fourth cooling fan 1012. This effectively eliminates heat accumulation at the top of the first zone 101, ensuring the long-term stable operation of the control transformer and capacitor board; the heat shield physically blocks the heat radiation and convection transfer from the high-temperature zone to the medium-temperature zone, reducing the temperature rise fluctuation of the second zone 102 by 73%; the rigid connection between the outer heat-conducting plate 121 and the inner heat dissipation plate 122, and the design of the directional air duct heat dissipation shell 12, significantly reduce the interface thermal resistance and improve airflow utilization efficiency, increasing the overall heat dissipation efficiency of the rear panel by 41%; the integration of the double-door structure and the external rocker mechanism ensures the convenience of high-frequency operation while completely avoiding the risk of explosion-proof failure caused by opening the cover.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mine charger explosion-proof heat dissipation housing, comprising a hexahedral housing (10), an openable door (11) located at the front of the housing (10), a wiring cavity (13) located at the top of the housing (10), a base located at the bottom of the housing (10), and electrical functional components built into the housing (10); Its features are: An inner heat dissipation plate (122) is fixed on the inner side of the rear plate of the housing (10), and an outer heat conduction plate (121) is fixed on the corresponding position on the outer side. The outer heat conduction plate (121) and the inner heat dissipation plate (122) are rigidly connected through a fixing hole through the rear plate. The outer heat conduction plate (121) is covered with a heat dissipation shell (12). One side of the heat dissipation shell (12) is provided with an air inlet opening, and the opposite side is provided with an air outlet ventilation hole. A first cooling fan (15) is fixed at the air inlet opening. Two rows of parallel reinforcing beams are arranged longitudinally inside the housing (10). The two ends of the reinforcing beams are fixedly connected to the upper plate and the lower plate of the housing (10) respectively, dividing the inner cavity of the housing (10) into a first region (101), a second region (102) and a third region (103) from top to bottom.

2. The explosion-proof heat dissipation housing for a mining charger according to claim 1, characterized in that: The first region (101) is located on the upper part of the housing (10), and five fourth cooling fans (1012) are arranged in an array on its side wall. The first region (101) is provided with a zig-shaped heat dissipation bracket (1011) that is fixedly connected to the inner side of the rear plate of the housing (10). The top of the zig-shaped heat dissipation bracket (1011) is fixed with a capacitor plate and the bottom is fixed with a core assembly.

3. The explosion-proof heat dissipation housing for a mining charger according to claim 2, characterized in that: The second region (102) is located in the middle of the housing (10), and there is an embedded heat dissipation module (1021) spanning between two reinforcing beams. The embedded heat dissipation module (1021) includes a housing, multiple parallel heat dissipation fins disposed in the housing, and two third heat dissipation fans disposed on one side of the heat dissipation fins and whose air ducts match the gaps between adjacent fins.

4. The explosion-proof heat dissipation housing for a mining charger according to claim 3, characterized in that: The third region (103) is located at the lower part of the shell (10), and an arched heat dissipation bracket is provided therein. The arched heat dissipation bracket covers the top space of the third region (103), and six second heat dissipation fans are fixed at intervals on its top surface. A heat baffle is provided between the second region (102) and the third region (103), and the heat baffle is sealed to the inner wall of the shell (10) around its perimeter.

5. The explosion-proof heat dissipation housing for a mining charger according to claim 4, characterized in that: The door (11) includes an upper door and a lower door hinged to the front side of the housing (10). The outer surface of the upper door is fixed with a control panel. The control panel is provided with a power button, a power off button, a start button, a stop button, a reset button, and a display screen located above the buttons.

6. The explosion-proof heat dissipation housing for a mining charger according to claim 5, characterized in that: The housing (10) is also provided with an isolation phase-changing switch. A transmission rod is fixed on one side of the isolation phase-changing switch. The transmission rod passes through the front side wall of the housing (10) and extends to the outside of the housing (10). An isolation switch rocker arm (14) is fixedly connected to its outer end.

7. The explosion-proof heat dissipation housing for a mining charger according to claim 6, characterized in that: The reinforcing beam is fixedly connected to the upper and lower plates of the shell (10) by full welding.

8. The explosion-proof heat dissipation housing for a mining charger according to claim 7, characterized in that: The external heat-conducting plate (121) has a multi-layer plate structure. Multiple copper pipes are installed inside the external heat-conducting plate (121). The copper pipes are fitted with the surface of the inner heat dissipation plate (122) and form a fixed connection. The external heat-conducting plate (121) is connected to the inner heat dissipation plate (122) through the copper pipes.

9. The explosion-proof heat dissipation housing for a mining charger according to claim 8, characterized in that: The embedded heat dissipation module (1021) has 20 to 40 heat dissipation fins, with a height of 15 mm to 25 mm and a spacing of 4 mm to 6 mm between adjacent fins.

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